阅读说明：本技术 显示装置以及滤色器基板 (Display device and color filter substrate ) 是由 前出优次 于 2018-12-25 设计创作，主要内容包括：本实施方式的目的在于,提供一种能够改善显示品质的显示装置以及滤色器基板。本实施方式的显示装置具备：第一基板,具备第一取向膜；第二基板,具备第二取向膜；以及液晶层,设于所述第一基板及所述第二基板之间,所述第一基板具备第一像素电极和第二像素电极,所述第二基板具备：绝缘基板,具有第一面；第一着色层,与所述第一像素电极对置,并与所述第一面相接；以及透明树脂层,设于所述第一着色层与所述第二取向膜之间,所述透明树脂层具有与所述第二像素电极对置的凹部,所述第二取向膜与所述凹部相接。(An object of the present embodiment is to provide a display device and a color filter substrate capable of improving display quality. The display device of the present embodiment includes: a first substrate provided with a first alignment film; a second substrate provided with a second alignment film; and a liquid crystal layer provided between the first substrate and the second substrate, the first substrate including a first pixel electrode and a second pixel electrode, the second substrate including: an insulating substrate having a first surface; a first coloring layer facing the first pixel electrode and contacting the first surface; and a transparent resin layer provided between the first coloring layer and the second alignment film, the transparent resin layer having a recess facing the second pixel electrode, the second alignment film being in contact with the recess.)

1. A display device is provided with:

a first substrate provided with a first alignment film;

a second substrate provided with a second alignment film; and

a liquid crystal layer disposed between the first substrate and the second substrate,

the first substrate is provided with a first pixel electrode and a second pixel electrode,

the second substrate includes:

an insulating substrate having a first surface;

a first coloring layer facing the first pixel electrode and contacting the first surface; and

a transparent resin layer provided between the first coloring layer and the second alignment film,

the transparent resin layer has a concave portion facing the second pixel electrode,

the second alignment film is in contact with the recess.

2. The display device according to claim 1,

the second substrate includes first to fourth light-shielding portions which are respectively in contact with the first surface and are arranged in order at intervals in the first direction,

the first pixel electrode is located between the first light-shielding portion and the second light-shielding portion, and the second pixel electrode is located between the second light-shielding portion and the third light-shielding portion in a plan view,

the transparent resin layer is in contact with the first coloring layer at a first intermediate point between the first light-shielding portion and the second light-shielding portion, and is in contact with the first surface at a second intermediate point between the second light-shielding portion and the third light-shielding portion,

the liquid crystal layer is in contact with a second surface of the first alignment film and a third surface of the second alignment film, and has a first thickness between the second surface and the third surface at the first intermediate point and a second thickness between the second surface and the third surface at the second intermediate point, the second thickness being thicker than the first thickness,

the second substrate has a third thickness between the first face and the third face at the first intermediate point, and has a fourth thickness between the first face and the third face at the second intermediate point, the fourth thickness being thinner than the third thickness.

3. The display device according to claim 2,

the difference between the third thickness and the fourth thickness is 1/6 or less of the first thickness.

4. The display device according to claim 2,

the difference between the third thickness and the fourth thickness is 0.05 μm or more and 0.35 μm or less.

5. The display device according to claim 4,

the first substrate further includes a third pixel electrode,

the second substrate further includes a second color layer facing the third pixel electrode between the third light-shielding portion and the fourth light-shielding portion and contacting the first surface,

the laminate of the first coloring layer and the second light-shielding portion has a fifth thickness, the laminate of the second coloring layer and the third light-shielding portion has a sixth thickness, and the fifth thickness is thinner than the sixth thickness.

6. The display device according to claim 5,

the second coloring layer has a color different from that of the first coloring layer.

7. The display device according to claim 5,

one of the first colored layer and the second colored layer is red, and the other is green.

8. The display device according to claim 2,

the first substrate further includes a fourth pixel electrode,

the second substrate further includes: fifth to seventh light-shielding portions which are respectively in contact with the first surface and are arranged in order at intervals in the second direction; and

a third coloring layer facing the fourth pixel electrode between the fifth light-shielding portion and the sixth light-shielding portion and contacting the first surface,

the transparent resin layer is in contact with the third coloring layer between the fifth light-shielding portion and the sixth light-shielding portion, and is in contact with the first surface between the sixth light-shielding portion and the seventh light-shielding portion,

a first width of the fifth light-shielding portion in contact with the third coloring layer is larger than a second width of the sixth light-shielding portion in contact with the third coloring layer.

9. The display device according to claim 8,

the second width is 2.5 μm or less.

10. The display device according to claim 8,

the laminate of the third colored layer and the fifth light-shielding portion has a seventh thickness, and the laminate of the third colored layer and the sixth light-shielding portion has an eighth thickness that is thinner than the seventh thickness.

11. The display device according to claim 8,

a third width of the sixth light-shielding portion in contact with the transparent resin layer is larger than a fourth width of the seventh light-shielding portion in contact with the transparent resin layer.

12. A color filter substrate is provided with:

an insulating substrate;

a light shielding portion having a plurality of openings formed in a matrix;

a color filter layer including a red color filter, a blue color filter, and a green color filter; and

an outer coating layer, wherein,

the plurality of openings include a first opening and a second opening,

a color filter of a certain color of the color filter layer is positioned at the first opening portion,

the overcoat layer has a first surface that is in contact with the color filter layer in the first opening portion and in contact with the insulating substrate in the second opening portion, and a second surface opposite to the first surface,

a first distance from the insulating substrate to the second face in the first opening portion is larger than a second distance from the insulating substrate to the second face in the second opening portion.

13. The color filter substrate according to claim 12, wherein,

the first opening portion is the blue color filter, and the first opening portion and the second opening portion are adjacent to each other in the row direction.

14. The color filter substrate according to claim 13,

the insulating substrate has a long side extending in the row direction and a short side extending in the column direction.

15. The color filter substrate according to claim 14,

the difference between the first distance and the second distance is 0.05 μm or more and 0.30 μm or less.

16. The color filter substrate according to claim 15,

the film thickness in the first opening portion of the overcoat layer is smaller than the film thickness in the second opening portion.

17. The color filter substrate according to claim 16,

the color filter substrate is further provided with a spacer, and a difference between the first distance and the second distance is smaller than a height of the spacer.

Technical Field

Embodiments of the invention relate to a display device and a color filter substrate.

Background

In recent years, various techniques for improving the display quality of a display device have been studied. In one example, a technique is disclosed in which the surface of an overcoat layer covering each of red, green, and blue color filters is planarized, and the overcoat layer also functions as a white color filter. In another example, a technique is disclosed in which an overcoat layer and a white color filter are stacked in a white pixel to form a white color filter and a structure integrally.

Disclosure of Invention

Problems to be solved by the invention

An object of the present embodiment is to provide a display device and a color filter substrate capable of improving display quality.

Means for solving the problems

According to the present embodiment, there is provided a display device including:

a first substrate provided with a first alignment film;

a second substrate provided with a second alignment film; and

a liquid crystal layer disposed between the first substrate and the second substrate,

the first substrate is provided with a first pixel electrode and a second pixel electrode,

the second substrate includes:

an insulating substrate having a first surface;

a first coloring layer facing the first pixel electrode and contacting the first surface; and

a transparent resin layer provided between the first coloring layer and the second alignment film,

the transparent resin layer has a concave portion facing the second pixel electrode,

the second alignment film is in contact with the recess.

According to the present embodiment, there is provided a color filter substrate including:

an insulating substrate;

a light shielding portion having a plurality of openings formed in a matrix;

a color filter layer including a red color filter, a blue color filter, and a green color filter; and

an overcoat layer, wherein, in the color filter substrate,

the plurality of openings include a first opening and a second opening,

a color filter of a certain color of the color filter layer is positioned at the first opening portion,

the overcoat layer has a first surface that is in contact with the color filter layer in the first opening portion and in contact with the insulating substrate in the second opening portion, and a second surface opposite to the first surface,

a first distance from the insulating substrate to the second face in the first opening portion is larger than a second distance from the insulating substrate to the second face in the second opening portion.

Effects of the invention

According to the present embodiment, a display device and a color filter substrate that can improve display quality can be provided.

Drawings

Fig. 1 is a plan view showing an external appearance of a display device DSP according to the present embodiment.

Fig. 2 is a diagram showing a basic configuration and an equivalent circuit of the pixel PX.

Fig. 3 is a plan view showing an example of a pixel layout.

Fig. 4 is a plan view showing the light-shielding layer BM corresponding to the pixel layout shown in fig. 3.

Fig. 5 is a sectional view showing the structure of the display panel PNL.

Fig. 6 is a plan view showing an example of the pixel shown in fig. 3.

Fig. 7 is a cross-sectional view of the first substrate SUB1 taken along the line a-B shown in fig. 6.

Fig. 8 is a cross-sectional view of the display panel PNL taken along line C-D shown in fig. 6.

Fig. 9 is a cross-sectional view of the display panel PNL taken along line E-F shown in fig. 4.

Fig. 10 is a cross-sectional view of the display panel PNL along the line G-H shown in fig. 4.

Fig. 11 is a diagram for explaining embodiments 1 to 3.

Fig. 12A is a graph showing the spectral transmittance (japanese: spectral transmittance) of the liquid crystal layer LC in the white pixel PW.

Fig. 12B is a diagram showing an example of the first spectral intensity (japanese: spectral intensity) of the illumination light (white light) with which the illumination device IL shown in fig. 8 illuminates the first substrate SUB 1.

Fig. 13A is a diagram showing a blue wavelength region in the second spectral intensity in an enlarged manner.

Fig. 13B is a diagram showing a green wavelength region in the second spectral intensity in an enlarged manner.

Fig. 13C is a diagram showing the red wavelength region in the second spectral intensity in an enlarged manner.

Fig. 14 is a diagram showing an example of the relationship between the cell gap d and the second chromaticity.

Fig. 15 is a sectional view showing another configuration example of the present embodiment.

Fig. 16 is a diagram showing the thickness distribution of the color filter CFB in contact with the light-shielding portions B31 and B32 shown in fig. 15.

Fig. 17 is a diagram showing thickness distributions of the light shielding portions B31 and B32, the color filter CFB, and the overcoat layer OC.

Fig. 18 is a plan view showing the light-shielding layer BM corresponding to another pixel layout.

Detailed Description

The present embodiment will be described below with reference to the drawings. The disclosure is merely an example, and it is needless to say that a person skilled in the art can easily conceive appropriate modifications for keeping the gist of the present invention, and the present invention is also included in the scope of the present invention. In order to make the description more clear, the drawings are intended to schematically show the width, thickness, shape, and the like of each part as compared with the actual embodiment, but the drawings are merely examples and do not limit the explanation of the present invention. In the present specification and the drawings, the same reference numerals are given to components that perform the same or similar functions as those described with respect to the existing drawings, and overlapping detailed description is appropriately omitted.

Fig. 1 is a plan view showing an external appearance of a display device DSP according to the present embodiment. In one example, the first direction X, the second direction Y, and the third direction Z are orthogonal to each other, but may intersect at an angle other than 90 degrees. The first direction X and the second direction Y correspond to a direction parallel to a main surface of a substrate constituting the display device DSP, and the third direction Z corresponds to a thickness direction of the display device DSP. In the present specification, a position on the side of the tip of the arrow indicating the third direction Z is referred to as "upper", and a position on the side opposite to the tip of the arrow is referred to as "lower". Further, it is assumed that an observation position for observing the display device DSP exists on the tip side of an arrow indicating the third direction Z, and observation from the observation position to an X-Y plane defined by the first direction X and the second direction Y is referred to as a plan view. In fig. 1, a direction that intersects counterclockwise at an acute angle with respect to the second direction Y is defined as a direction D1, and a direction that intersects clockwise at an acute angle with respect to the second direction Y is defined as a direction D2. In addition, an angle θ 1 formed by the second direction Y and the direction D1 is substantially the same as an angle θ 2 formed by the second direction Y and the direction D2.

Here, a top view of the display device DSP in the X-Y plane is shown. The display device DSP includes a display panel PNL, a flexible printed circuit board 1, and an IC chip 2.

The display panel PNL is a liquid crystal display panel, and includes a first substrate SUB1, a second substrate SUB2, a liquid crystal layer LC described later, a seal SE, and a light-shielding layer LS. The display panel PNL includes a display portion DA for displaying an image and a frame-shaped non-display portion NDA surrounding the display portion DA. The second substrate SUB2 is opposed to the first substrate SUB 1. The first substrate SUB1 has a mounting portion MA extending in the second direction Y than the second substrate SUB 2.

The seal SE is located at the non-display portion NDA, bonds the first substrate SUB1 and the second substrate SUB2, and seals the liquid crystal layer LC. The light-shielding layer LS is located in the non-display portion NDA. The seal SE is provided at a position overlapping the light-shielding layer LS in a plan view. In fig. 1, the region where the seal SE is disposed and the region where the light-shielding layer LS is disposed are indicated by different oblique lines, and the region where the seal SE and the light-shielding layer LS overlap is indicated by cross hatching. The light-shielding layer LS is provided on the second substrate SUB 2.

The display unit DA is located inside surrounded by the light-shielding layer LS. The display unit DA includes a plurality of pixels PX arranged in a matrix (matrix) in a first direction X (column direction) and a second direction Y (row direction). In the illustrated example, the pixels PX located in the odd-numbered rows along the second direction Y extend in the direction D1. In addition, the pixels PX located in the even-numbered row along the second direction Y extend along the direction D2. Here, the pixel PX represents a minimum unit that can be separately controlled according to a pixel signal, and is sometimes referred to as a sub-pixel. In addition, the minimum unit for realizing color display is sometimes referred to as a main pixel MP. The main pixel MP includes a plurality of sub-pixels PX each displaying a different color. In one example, the main pixel MP includes, as the sub-pixel PX, a red pixel for displaying red, a green pixel for displaying green, a blue pixel for displaying blue, and a white pixel for displaying white.

The display section DA has a pair of edges E1 and E2 extending along the first direction X, a pair of edges E3 and E4 extending along the second direction Y, and four circular sections R1 to R4. The display panel PNL has a pair of straight portions E11 and E12 extending along the first direction X, a pair of straight portions E13 and E14 extending along the second direction Y, and two circular portions R11 and R12. The rounded portions R11 and R12 are located outside the rounded portions R1 and R2, respectively. The radius of curvature of the rounded portion R11 may be the same as or different from the radius of curvature of the rounded portion R1. The linear portion E11 corresponds to the short sides of the first substrate SUB1 and the second substrate SUB2, and the linear portion E12 corresponds to the short side of the first substrate SUB 1. The straight portions E13 and E14 correspond to the long sides of the first substrate SUB1 and the second substrate SUB 2.

The flexible printed circuit board 1 and the IC chip 2 are mounted on the mounting portion MA. The IC chip 2 may be mounted on the flexible printed circuit board 1. The IC chip 2 incorporates a display driver DD that outputs signals necessary for image display in a display mode for displaying an image. In the illustrated example, the IC chip 2 incorporates a touch controller TC that controls a touch sensing detection mode for detecting an approach or contact of an object to the display device DSP.

The display panel PNL according to the present embodiment may be any of a transmissive type having a transmissive display function of selectively transmitting light from the back surface side of the first substrate SUB1 to display an image, a reflective type having a reflective display function of selectively reflecting light from the front surface side of the second substrate SUB2 to display an image, and a transflective type having a transmissive display function and a reflective display function.

Although the detailed configuration of the display panel PNL is omitted here, the display panel PNL may have any configuration corresponding to the following display modes: a display mode using a lateral electric field along the main surface of the substrate, a display mode using a vertical electric field along the normal to the main surface of the substrate, a display mode using an oblique electric field oblique to the main surface of the substrate, and a display mode using an appropriate combination of the lateral electric field, the vertical electric field, and the oblique electric field. The substrate main surface herein refers to a surface parallel to an X-Y plane defined by the first direction X and the second direction Y.

Fig. 2 is a diagram showing a basic configuration and an equivalent circuit of the pixel PX. The plurality of scanning lines G are connected to a scanning line driving circuit GD. The plurality of signal lines S are connected to the signal line driving circuit SD. The scanning line G and the signal line S do not necessarily extend linearly, and a part of them may be bent. For example, the signal line S is provided to extend in the second direction Y even if a portion thereof is bent.

The common electrode CE is connected to a voltage supply section CD for a common voltage (Vcom), and is disposed over a plurality of pixels PX.

Each pixel PX includes a switching element SW, a pixel electrode PE, a common electrode CE, a liquid crystal layer LC, and the like. The switching element SW is formed of, for example, a Thin Film Transistor (TFT), and is electrically connected to the scanning line G and the signal line S. The scanning line G is electrically connected to the switching element SW in each of the pixels PX arranged in the first direction X. The signal line S is electrically connected to the switching element SW in each of the pixels PX arranged in the second direction Y. The pixel electrode PE is electrically connected to the switching element SW. The pixel electrodes PE face the common electrode CE, respectively, and the liquid crystal layer LC is driven by an electric field generated between the pixel electrodes PE and the common electrode CE. The holding capacitor CS is formed between an electrode having the same potential as the common electrode CE and an electrode having the same potential as the pixel electrode PE, for example.

Fig. 3 is a plan view showing an example of a pixel layout. The scanning lines G1 to G3 extend linearly in the first direction X and are arranged at intervals in the second direction Y. The signal lines S1 to S7 extend substantially in the second direction Y and are arranged at intervals in the first direction X.

Between the scanning lines G1 and G2, a red pixel PR1, a green pixel PG1, a blue pixel PB1, a red pixel PR1, a green pixel PG1, and a white pixel PW1 are arranged in this order along the first direction X.

Between the scanning lines G1 and G2, the signal lines S1 to S3 are arranged at equal intervals W1, the signal lines S4 to S7 are arranged at equal intervals W1, and the interval W2 between the signal lines S3 and S4 is larger than the interval W1. The blue pixel PB1 is located between the signal lines S3 and S4. The intervals W1 and W2 are both lengths along the first direction X.

A pixel electrode PE11 having the same shape is disposed in each of the red pixel PR1 and the green pixel PG1, a pixel electrode PE12 larger than the pixel electrode PE11 is disposed in the blue pixel PB1, and a pixel electrode PE13 smaller than the pixel electrode PE11 is disposed in the white pixel PW 1. With respect to the length Lx along the first direction X, the pixel electrodes PE11 and PE13 have an equal length Lx1, and the pixel electrode PE12 has a length Lx2 longer than the length Lx 1. Regarding the length Ly along the second direction Y, the pixel electrode PE11 has a length Ly1, the pixel electrode PE12 has a length Ly2 longer than the length Ly1, and the pixel electrode PE13 has a length Ly3 shorter than the length Ly 1. The pixel electrodes PE11 and PE13 are located between the scan lines G1 and G2. The pixel electrode PE12 is located between the scan lines G1 and G2, and intersects the scan line G2.

The pixel electrodes PE11 to PE13 have band electrodes Pa1 to Pa3 extending along the direction D1, respectively. In the illustrated example, two charged electrodes Pa1 and Pa3 are provided, and three charged electrodes Pa2 are provided. The band electrodes Pa 1-Pa 3 are located between the scan lines G1 and G2. With respect to length Ld along direction D1, charged electrode Pa1 has length Ld1, charged electrode Pa2 has length Ld2 longer than length Ld1, and charged electrode Pa3 has length Ld3 shorter than length Ld 1.

Between the scanning lines G2 and G3, a red pixel PR2, a green pixel PG2, a white pixel PW2, a red pixel PR2, a green pixel PG2, and a blue pixel PB2 are arranged in this order along the first direction X. The red pixels PR1 and PR2, the green pixels PG1 and PG2, the blue pixel PB1 and the white pixel PW2, and the white pixel PW1 and the blue pixel PB2 are arranged in the second direction Y, respectively.

Between the scanning lines G2 and G3, the signal lines S1 to S6 are arranged at equal intervals W1, and the interval W2 between the signal lines S6 and S7 is larger than the interval W1. The blue pixel PB2 is located between the signal lines S6 and S7.

Although not described in detail, the pixel electrode PE21 having the same shape is disposed in each of the red pixel PR2 and the green pixel PG2, the pixel electrode PE22 larger than the pixel electrode PE21 is disposed in the blue pixel PB2, and the pixel electrode PE23 smaller than the pixel electrode PE21 is disposed in the white pixel PW 2. The pixel electrodes PE21 to PE23 have band electrodes Pb1 to Pb3, respectively, extending along the direction D2. The pixel electrodes PE21 to PE23 have the same shape as the pixel electrodes PE11 to PE13, respectively. In addition, the width of the charged electrode Pb3 along the first direction X is larger than the width of the charged electrode Pb1 along the first direction X. In addition, the width of the charged electrode Pb2 along the first direction X is smaller than the width of the charged electrode Pb1 along the first direction X.

Fig. 4 is a plan view showing the light-shielding layer BM corresponding to the pixel layout shown in fig. 3. The light-shielding layer BM is formed in a lattice shape and overlaps the scanning lines G1 to G3 and the signal lines S1 to S7, respectively, in a plan view. Such a light-shielding layer BM surrounds the red pixels PR1 and PR2, the green pixels PG1 and PG2, the blue pixels PB1 to PB3, and the white pixels PW1 and PW2, respectively. The light-shielding layer BM is formed of the same light-shielding material as the light-shielding layer LS of the non-display portion NDA shown in fig. 1, and is connected to the light-shielding layer LS in the non-display portion NDA.

In the illustrated example, the light shielding layer BM has light shielding portions B11 to B15, light shielding portions B21 to B25, and light shielding portions B31 to B33. The light shielding portions B11 through B15 extend along the direction D1 between the scanning lines G1 and G2, respectively, and overlap the signal lines S1 through S5, respectively. The light shielding portions B21 through B25 extend along the direction D2 between the scanning lines G2 and G3, respectively, and overlap the signal lines S1 through S5, respectively. The light shielding portions B31-B33 extend along the direction D1 and overlap the scan lines G1-G3, respectively. These light-shielding portions form a plurality of openings through which light is transmitted. The plurality of openings are arranged in a matrix. Each opening corresponds to any one of the red pixel PR, the green pixel PG, the blue pixel PB, and the white pixel PW.

For example, the blue pixel PB1 is surrounded by the light shielding portions B13, B14, B31, and B32. Further, white pixel PW2 is surrounded by light-shielding portions B23, B24, B32, and B33. The blue pixel PB1 and the white pixel PW2 are adjacent in the second direction (row direction) Y. The white pixel PW2 is located between the green pixel PG2 and the red pixel PR2, and is located between the blue pixels PB1 and PB 3.

The signal line S5 is located between the red pixel PR1 and the green pixel PG1 and between the red pixel PR2 and the green pixel PG 2. The main spacer MSP and the sub spacer SSP both overlap the signal line S5. The main spacer MSP forms a cell gap of the first substrate SUB1 and the second substrate SUB2, and the SUB spacer SSP has a height lower than that of the main spacer MSP.

The light shielding layer BM extends around the sub spacer SSP in a substantially concentric manner with the sub spacer SSP. The light-shielding layer BM also extends around the main spacer MSP in a substantially concentric circle shape with the main spacer MSP.

A red color filter CFR is disposed in the red pixels PR1 and PR2, a green color filter CFG is disposed in the green pixels PG1 and PG2, and a blue color filter CFB is disposed in the blue pixels PB1 to PB 3. A transparent overcoat OC described later is disposed in the white pixels PW1 and PW 2.

Fig. 5 is a sectional view showing the structure of the display panel PNL. The main spacer MSP and the SUB spacer SSP are located between the first substrate SUB1 and the second substrate SUB 2. The main spacer MSP is in contact with the first substrate SUB1 and the second substrate SUB2, and a predetermined cell gap is formed between the first substrate SUB1 and the second substrate SUB 2. The SUB spacer SSP is in contact with one of the first substrate SUB1 and the second substrate SUB2 and is separated from the other. In the illustrated example, the SUB spacer SSP is separated from the first substrate SUB1 and contacts the second substrate SUB 2. The main spacer MSP and the SUB spacer SSP are not limited to the example shown in the drawings in which they are provided on the second substrate SUB2, and may be provided on the first substrate SUB1, or may be provided on different substrates. Alternatively, the sub spacer SSP may be omitted. The seal SE is disposed in the non-display portion NDA, and the first substrate SUB1 and the second substrate SUB2 are bonded to each other with a cell gap formed therebetween. The liquid crystal layer LC is held between the first substrate SUB1 and the second substrate SUB 2.

Fig. 6 is a plan view showing an example of the pixel shown in fig. 3. Here, the main portion of the description will be focused on a green pixel PG1 surrounded by the scanning lines G1 and G2 and the signal lines S5 and S6 shown in fig. 3.

The switching element SW is electrically connected to the scanning line G2 and the signal line S6. The switching element SW of the illustrated example has a double-gate configuration. The switching element SW includes a semiconductor layer SC and a drain electrode DE. In the switching element SW, the drain electrode DE is sometimes referred to as a source electrode. The semiconductor layer SC is disposed so that a part thereof overlaps with the signal line S6, and the other part thereof extends between the signal lines S5 and S6 and is formed in a substantially U shape. The semiconductor layer SC intersects the scanning line G2 in a region overlapping with the signal line S6 and between the signal lines S5 and S6, respectively. In the scanning line G2, regions overlapping with the semiconductor layer SC function as gate electrodes GE1 and GE2, respectively. The semiconductor layer SC has one end portion SCA electrically connected to the signal line S6 through the contact hole CH1, and has the other end portion SCB electrically connected to the drain electrode DE through the contact hole CH 2. The drain electrode DE is formed in an island shape and is disposed between the signal lines S5 and S6.

The pixel electrode PE11 includes a base BS integrated with a plurality of strip electrodes Pa 1. The base portion BS overlaps the drain electrode DE. The base BS is electrically connected to the drain electrode DE.

Fig. 7 is a cross-sectional view of the first substrate SUB1 taken along the line a-B shown in fig. 6. The first substrate SUB1 includes an insulating substrate 10, insulating films 11 to 16, a semiconductor layer SC, a scanning line G2, a signal line S6, a metal wiring ML6, a common electrode CE, an alignment film AL1, and the like.

The insulating substrate 10 is a substrate having light-transmitting properties, such as a glass substrate or a flexible resin substrate. The insulating film 11 is located over the insulating substrate 10. The semiconductor layer SC is located above the insulating film 11 and covered with the insulating film 12. The gate electrode GE1 which is a part of the scanning line G2 is located over the insulating film 12 and covered with the insulating film 13. The other scanning lines not shown are also located in the same layer as the scanning line G2. The signal line S6 is located above the insulating film 13 and covered with the insulating film 14. Other signal lines not shown are also located in the same layer as the signal line S6. The signal line S6 is in contact with the semiconductor layer SC through a contact hole CH1 penetrating the insulating films 12 and 13. The metal wiring ML6 is located above the insulating film 14 and covered with the insulating film 15. The common electrode CE is located above the insulating film 15 and covered with an insulating film 16. The common electrode CE is in contact with the metal wiring ML6 through a contact hole CH3 penetrating the insulating film 15. The alignment film AL1 is located on the insulating film 16.

The insulating films 11 to 13 and the insulating film 16 are inorganic insulating films made of an inorganic insulating material such as silicon oxide, silicon nitride, or silicon nitride, and may have a single-layer structure or a multi-layer structure. The insulating films 14 and 15 are organic insulating films made of an organic insulating material such as acrylic resin, for example. The insulating film 15 may be an inorganic insulating film.

Fig. 8 is a cross-sectional view of the display panel PNL taken along line C-D shown in fig. 6. The illustrated example corresponds to an example in which an FFS (Fringe Field Switching) mode, which is one of display modes using a horizontal electric Field, is applied.

In the first substrate SUB1, the signal lines S5 and S6 are located above the insulating film 13 and covered with the insulating film 14. The metal wirings ML5 and ML6 are located directly above the signal lines S5 and S6, respectively. The pixel electrode PE11 is located on the insulating film 16 and covered with the alignment film AL 1. The pixel electrode PE11 and the common electrode CE are transparent electrodes made of a transparent conductive material such as Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO).

The second substrate SUB2 includes an insulating substrate 20, a light-shielding layer BM, a color filter layer CF, an overcoat layer OC, an alignment film AL2, and the like. Such a second substrate SUB2 is sometimes referred to as a color filter substrate. The insulating substrate 20 is a transparent substrate such as a glass substrate or a flexible resin substrate, similar to the insulating substrate 10. The light-shielding layer BM and the color filter layer CF are located on the side of the insulating substrate 20 facing the first substrate SUB 1. The color filter layer CF includes a red color filter CFR, a green color filter CFG, and a blue color filter CFB. The color filter CFG is opposed to the pixel electrode PE 11. The overcoat layer OC covers the color filter CFG. The overcoat layer OC is formed of a transparent resin. The other color filters CFR and CFB are also opposed to the pixel electrode PE, respectively, similarly to the color filter CFG, and are covered with the overcoat layer OC. The alignment film AL2 covers the overcoat layer OC. The alignment films AL1 and AL2 are formed of, for example, a material exhibiting horizontal alignment.

The first substrate SUB1 and the second substrate SUB2 are disposed so as to face the alignment films AL1 and AL 2. The cell gap between the first substrate SUB1 and the second substrate SUB2 is, for example, 2 to 5 μm.

The liquid crystal layer LC is located between the first substrate SUB1 and the second substrate SUB2, and is held between the alignment films AL1 and AL 2. The liquid crystal layer LC includes liquid crystal molecules LM. The liquid crystal layer LC is formed of a positive type (dielectric anisotropy is positive) liquid crystal material or a negative type (dielectric anisotropy is negative) liquid crystal material.

An optical element OD1 including a polarizing plate PL1 was bonded to the insulating substrate 10. An optical element OD2 including a polarizing plate PL2 was bonded to the insulating substrate 20. The optical elements OD1 and OD2 may also be provided with a retardation plate, a scattering layer, an antireflection layer, and the like as needed. The illumination device IL illuminates the first substrate SUB1 of the display panel PNL with white illumination light.

In such a display panel PNL, in an off state where no electric field is formed between the pixel electrode PE and the common electrode CE, the liquid crystal molecules LM are initially aligned in a predetermined direction between the alignment films AL1 and AL 2. In such an off state, illumination light emitted from the illumination device IL toward the display panel PNL is absorbed by the optical elements OD1 and OD2, and dark display is performed. On the other hand, in the on state where an electric field is formed between the pixel electrode PE and the common electrode CE, the liquid crystal molecules LM are aligned in a direction different from the initial alignment direction by the electric field, and the alignment direction thereof is controlled by the electric field. In such an on state, part of the illumination light from the illumination device IL passes through the optical elements OD1 and OD2, and becomes bright display.

Fig. 9 is a cross-sectional view of the display panel PNL taken along line E-F shown in fig. 4. Here, the structure of the first substrate SUB1 is simplified, and only the alignment film AL1 having the plane SF1 and the pixel electrode PE are shown. The alignment film AL2 has a face SF2 opposite to the face SF 1. The liquid crystal layer LC is in contact with the plane SF1 and the plane SF2, respectively.

In the second substrate SUB2, the insulating substrate 20 has a surface SF3 on the side facing the liquid crystal layer LC. The plane SF3 is a plane parallel to the X-Y plane. The plane SF1 and the plane SF2 are parallel to the plane SF 3. The light shielding portions B21 to B25 are in contact with the surface SF3, respectively, and are arranged in this order at intervals along the first direction X. The color filters CFB, CFR, and CFG are respectively in contact with the plane SF 3.

For example, in the green pixel PG2, the color filter CFG located between the light-shielding portions B22 and B23 faces the pixel electrode PE21, is in contact with the light-shielding portions B22 and B23, respectively, and is in contact with the surface SF 3. In the red pixel PR2, the color filter CFR located between the light-shielding portions B24 and B25 faces the pixel electrode PE21, is in contact with the light-shielding portions B24 and B25, respectively, and is in contact with the surface SF 3. Overcoat OC has face SF4 and face SF 5. The surface SF4 is in contact with the color filters CFB, CFR, and CFG, respectively. In the white pixel PW2, the surface SF4 is directly in contact with the surface SF3 between the light-shielding portions B23 and B24. The face SF5 is directly connected to the alignment film AL 2. The surface SF5 has a concave portion CC1 between the light-shielding portions B23 and B24, which is concave toward the side away from the first substrate SUB 1. The recess CC1 faces the pixel electrode PE 23. The surface SF2 also has a concave portion CC2 recessed corresponding to the concave portion CC1, similarly to the surface SF 5. In one example, the recesses CC1 and CC2 have an equivalent depth DP.

Here, attention is paid to a first intermediate point M1 between the light shielding portion B22 and the light shielding portion B23, and a second intermediate point M2 between the light shielding portion B23 and the light shielding portion B24. The first intermediate point M1 corresponds to positions equidistant from the light-shielding portions B22 and B23, respectively. Similarly, the second intermediate point M2 corresponds to positions equidistant from the light-shielding portions B23 and B24, respectively. At the first intermediate point M1, the color filter CFG is in contact with the plane SF3, the overcoat OC is in contact with the color filter CFG, and the alignment film AL2 is in contact with the overcoat OC. At a second intermediate point M2, the overcoat OC is in contact with the face SF3, and the alignment film AL2 is in contact with the overcoat OC. At the second intermediate point M2, the recess CC1 overlaps the recess CC 2.

The liquid crystal layer LC has a first thickness T1 at a first intermediate point M1 and a second thickness T2 at a second intermediate point M2. The first thickness T1 and the second thickness T2 correspond to distances along the third direction Z between the plane SF1 and the plane SF2, respectively. The second thickness T2 is thicker than the first thickness T1.

The second substrate SUB2 has a third thickness (first distance) T3 at a first intermediate point M1 and a fourth thickness (second distance) T4 at a second intermediate point M2. The third thickness T3 and the fourth thickness T4 correspond to distances along the third direction Z between the plane SF2 and the plane SF3, respectively. The fourth thickness T4 is thinner than the third thickness T3. The third thickness T3 corresponds to the sum of the thicknesses of each of the color filter CFG, overcoat layer OC, and alignment film AL 2. The fourth thickness T4 corresponds to the sum of the thicknesses of the overcoat layer OC and the alignment film AL2, respectively. The thickness of the alignment film AL2 was approximately equal at the first intermediate point M1 and the second intermediate point M2. As for the overcoat layer OC, the thickness of the first intermediate point M1 is thinner than the thickness of the second intermediate point M2.

The depth DP of the concave portion CC2 at the second intermediate point M2 along the third direction Z corresponds to a difference Δ T34 between the third thickness T3 and the fourth thickness T4 or a difference Δ T12 between the first thickness T1 and the second thickness T2, for example, is 1/6 or less of the first thickness T1. In one example, the first thickness T1 is 2.8 μm and the difference Δ T34 is 0.05 μm or more and 0.35 μm or less. In addition, the difference Δ T34 is smaller than the spacer height in the third direction Z of the main spacer MSP shown in fig. 5. The differences Δ T12 and Δ T34 are absolute values.

The laminated body formed by the color filter CFG in contact with the light shielding portion B23 has the fifth thickness T5 as the maximum thickness. The laminated body formed by the color filter CFR in contact with the light shielding portion B24 has the sixth thickness T6 as the maximum thickness. In the illustrated example, the fifth thickness T5 is thinner than the sixth thickness T6. In addition, the sixth thickness T6 may be thinner than the fifth thickness T5. When color filters of different colors are disposed on both sides of white pixel PW2, a material for forming overcoat OC can easily flow into white pixel PW2 by forming one of the stacked bodies of the color filter and the light-shielding portion adjacent to white pixel PW2 to be thinner than the other.

The sixth thickness T6 may be the same thickness as the fifth thickness T5. That is, the laminate on both sides with white pixel PW2 interposed therebetween is preferably thinner than the thickness T10 of the other laminate (for example, the laminate of color filter CFR and light shielding portion B25). In the present invention, in order to facilitate flowing of overcoat layer OC into white pixel PW, color filters disposed on both sides with white pixel PW2 interposed therebetween are formed to be thin.

In the example shown in fig. 9, the alignment films AL1 and AL2 correspond to a first alignment film and a second alignment film, respectively, the light-shielding portion B22 corresponds to a first light-shielding portion, the light-shielding portion B23 corresponds to a second light-shielding portion, the light-shielding portion B24 corresponds to a third light-shielding portion, the light-shielding portion B25 corresponds to a fourth light-shielding portion, the color filter CFG corresponds to a first colored layer, the color filter CFR corresponds to a second colored layer, the overcoat layer OC corresponds to a transparent resin layer, the pixel electrode PE21 facing the color filter CFG corresponds to a first pixel electrode, the pixel electrode PE23 corresponds to a second pixel electrode, the pixel electrode PE21 facing the color filter CFR corresponds to a third pixel electrode, the surface SF3 corresponds to a first surface, the surface SF1 corresponds to a second surface, and the surface SF2 corresponds to a third surface. The green pixel PG2 corresponds to a first opening, the white pixel PW2 corresponds to a second opening, the surface SF4 corresponds to a first surface of the overcoat, and the surface SF5 corresponds to a second surface of the overcoat.

Fig. 10 is a cross-sectional view of the display panel PNL along the line G-H shown in fig. 4. The color filter CFB1 of the blue pixel PB1 located between the light-shielding portions B31 and B32 faces the pixel electrode PE12, is in contact with the light-shielding portions B31 and B32, respectively, and is in contact with the surface SF 3. The color filter CFB3 of the blue pixel PB3 is in contact with the light shielding portion B33 and with the face SF 3. The overcoat OC is in contact with the color filters CFB1 and CFB3, respectively, and is in contact with the surface SF3 between the light-shielding portions B32 and B33. The recess CC1 and the recess CC2 are located between the light-shielding portions B32 and B33. The recess CC1 faces the pixel electrode PE 23.

In the example shown in fig. 10, the liquid crystal layer LC also has a first thickness T1 in the central portion of the blue pixel PB1 and a second thickness T2 in the central portion of the white pixel PW 2. The second thickness T2 is thicker than the first thickness T1. The second substrate SUB2 has a third thickness T3 at the center of the blue pixel PB1 and a fourth thickness T4 at the center of the white pixel PW 2. The fourth thickness T4 is thinner than the third thickness T3.

In such a display panel PNL, it is required to reduce a difference between a first chromaticity of white light obtained by combining transmitted light of each of the red pixel PR, the green pixel PG, and the blue pixel PB and a second chromaticity of white light obtained by transmitted light of the white pixel PW. The first chromaticity can be adjusted by the area of the opening (light-transmitting region) of each of the red pixel PR, the green pixel PG, and the blue pixel PB, the luminance of each of the red pixel PR, the green pixel PG, and the blue pixel PB, and the like. In the present embodiment, the second chromaticity can be adjusted by the retardation Δ n · d of the liquid crystal layer LC in the white pixel PW. Here, Δ n is a value indicating the refractive index anisotropy of the liquid crystal layer LC, and d is a value corresponding to the cell gap or the second thickness T2 of the liquid crystal layer LC shown in fig. 9. The cell gap d can be adjusted by the depth DP of the recess CC 2.

The depth DP of the recess CC2 can be adjusted by various parameters such as the flowability of the material of the overcoat layer OC (the molecular weight of the material), the prebaking temperature at the time of forming the overcoat layer OC, the width of the white pixel PW along the first direction X and the width of the white pixel PW along the second direction Y, the overlapping amount of the light shielding portion B and the color filters CF, the distance between the adjacent two color filters CF, the thickness of the light shielding portion B, the thickness of the color filters CF, and the thickness of the overcoat layer OC.

That is, in the white pixel PW, the cell gap d can be adjusted by intentionally adjusting the depth DP of the recess CC2 (or the difference Δ T34), and the second chromaticity can be controlled.

Fig. 11 is a diagram for explaining embodiments 1 to 3. Here, a case where the depth DP is adjusted by parameters of the thickness TB of the light shielding portion B, the thickness TCF of the color filter CF, and the thickness TOC of the overcoat layer OC will be described as an example. The thickness TB is the thickness of the central portion of the light shielding portion B23 in fig. 9, the thickness TCF is the thickness of the color filter CFG at the first intermediate point M1, and the thickness TOC is the thickness of the overcoat layer OC at the first intermediate point M1. In addition, it is assumed that other light shielding portions have the same thickness TB and other color filters have the same thickness TCF. As reference values (Ref), the thickness TB was 1.5 μm, the thickness TCF was 2.6 μm, and the thickness TOC was 1.2. mu.m.

In example 1, the thickness TB was 1.5 μm, the thickness TCF was 2.3 μm, and the thickness TOC was 1.0. mu.m. At this time, the depth DP was 0.20. mu.m. In such a display panel PNL, the first chromaticity and the second chromaticity are simulated, and the difference Δ xy is zero. The first chromaticity and the second chromaticity are represented as coordinates (x, y) on an xy chromaticity diagram, respectively. The xy chromaticity diagram is a diagram in which chromaticity coordinates x and y are expressed on a plane in an XYZ color system of a2 ° field of view, and may be referred to as a CIE1931 chromaticity diagram. The difference Δ xy corresponds to a linear distance between the coordinates (x1, y1) of the first chromaticity and the coordinates (x2, y2) of the second chromaticity. In example 1, the coordinates (x1, y1) of the first chromaticity coincide with the coordinates (x2, y2) of the second chromaticity.

In example 2, the thickness TB was 1.5 μm, the thickness TCF was 2.3 μm, and the thickness TOC was 1.5. mu.m. At this time, the depth DP was 0.10. mu.m. In such a display panel PNL, the difference Δ xy between the first chromaticity and the second chromaticity is 0.007.

In example 3, the thickness TB was 1.0 μm, the thickness TCF was 2.3 μm, and the thickness TOC was 1.5. mu.m. At this time, the depth DP was 0.07. mu.m. In such a display panel PNL, the difference Δ xy between the first chromaticity and the second chromaticity is 0.009.

In this way, it was confirmed that the differences Δ xy were 0.01 or less in all of examples 1 to 3. The inventors have made various studies and have confirmed that the difference Δ xy is 0.01 or less in the range of 0.05 μm or more and 0.35 μm or less in the depth DP. This improves the display quality.

Next, a principle that the second chromaticity can be adjusted by the cell gap d of the liquid crystal layer LC in the white pixel PW will be described.

Fig. 12A is a graph showing the spectral transmittance of the liquid crystal layer LC in the white pixel PW. The horizontal axis represents wavelength (nm) and the vertical axis represents transmittance (modulation factor).

In the figure, a corresponds to a spectral transmittance in the case where the cell gap D of the white pixel PW (or the second thickness T2 in fig. 9) is 2.6 μm, B corresponds to a spectral transmittance in the case where the cell gap D is 2.7 μm, C corresponds to a spectral transmittance in the case where the cell gap D is 2.8 μm, D corresponds to a spectral transmittance in the case where the cell gap D is 2.9 μm, E corresponds to a spectral transmittance in the case where the cell gap D is 3.0 μm, F corresponds to a spectral transmittance in the case where the cell gap D is 3.1 μm, and G corresponds to a spectral transmittance in the case where the cell gap D is 3.2 μm.

Each of the spectral transmittances a to G of the liquid crystal layer LC does not have a certain transmittance in any wavelength but has a different transmittance depending on the wavelength. In general, in the visible light region (for example, a wavelength region of 400nm to 700 nm), the transmittance near the green wavelength is the maximum, and the transmittances near the blue wavelength and near the red wavelength are smaller than the transmittance near the green wavelength. Further, the maximum transmittance increases as the cell gap d increases, and the wavelength which becomes the maximum transmittance tends to shift to the long wavelength side.

Fig. 12B is a diagram showing an example of the first spectral intensity of the illumination light (white light) for illuminating the first substrate SUB1 by the illumination device IL shown in fig. 8. The horizontal axis represents wavelength (nm) and the vertical axis represents intensity (relative value). According to the illustrated example, in the first spectral intensity, the first peak intensity in the blue wavelength region is in the vicinity of 450nm, the second peak intensity in the green wavelength region is in the vicinity of 540nm, and the third peak intensity in the red wavelength region is in the vicinity of 630 nm. The first peak intensity is the largest among the first spectral intensities, the third peak intensity is smaller than the first peak intensity, and the second peak intensity is smaller than the third peak intensity.

The second spectral intensity of the transmitted light when the illumination light having the first spectral intensity shown in fig. 12B passes through the liquid crystal layer LC having the spectral transmittance shown in fig. 12A corresponds to the product of the first spectral intensity and the spectral transmittance.

Fig. 13A is a diagram showing a blue wavelength region in the second spectral intensity in an enlarged manner. Fig. 13B is a diagram showing a green wavelength region in the second spectral intensity in an enlarged manner. Fig. 13C is a diagram showing the red wavelength region in the second spectral intensity in an enlarged manner.

As shown in fig. 13A, in the blue wavelength region, the cell gap d tends to increase and the intensity tends to decrease. As shown in fig. 13B, in the green wavelength region, the cell gap d tends to increase and the intensity tends to increase. As shown in fig. 13C, in the red wavelength region, the cell gap d tends to increase and the intensity tends to increase. That is, under the condition that the cell gap d is different, the ratio of the intensity of each of the blue component, the green component, and the red component is different.

For example, the intensities of the respective wavelength regions of the transmitted light are compared between (a) when the cell gap d is 2.6 μm and (G) when the cell gap d is 3.2 μm. For the blue wavelength region, a is greater than G. For green and red wavelengths, a is smaller than G. That is, the cell gap d tends to increase, the blue component decreases, and the green component and the red component increase. Thus, the second chromaticity can be adjusted by adjusting the cell gap d of the white pixel PW.

Fig. 14 is a diagram showing an example of the relationship between the cell gap d and the second chromaticity.

There is a tendency that the chromaticity coordinates x and y increase as the cell gap d increases. For example, when the cell gap of each of the blue pixel, the green pixel, and the red pixel is 2.8 μm, the coordinates of the first chromaticity are (x1, y1) ═ 0.275, 0.282. In this case, in order to match the first and second chromaticities, as shown by E in the drawing, the cell gap d of the white pixel PW is set to 3.0 μm. Thus, the depth DP of the recess CC2 is set to 0.2 μm. This makes it possible to make the difference Δ xy between the first chromaticity and the second chromaticity zero.

Even when the cell gap D is set to 2.9 μm as shown in D (i.e., the depth DP is 0.1 μm) or 3.1 μm as shown in F (i.e., the depth DP is 0.3 μm), the difference Δ xy between the first chromaticity and the second chromaticity can be set to 0.01 or less.

Fig. 15 is a sectional view showing another configuration example of the present embodiment. The illustrated cross section corresponds to a cross section of the display panel PNL along the line G-H shown in fig. 4. The illustrated configuration example differs from the configuration example illustrated in fig. 10 in that the first width W11 of the light shielding portion B31 in contact with the color filter CFB1 is larger than the second width W12 of the light shielding portion B32 in contact with the color filter CFB 1. In other words, the contact area of the light shielding portion B31 with the color filter CFB1 is larger than the contact area of the light shielding portion B32 with the color filter CFB 1. Although not described in detail, not only the color filter CFB1 of the blue pixel PB1 shown in the figure but also the color filter CFB3 of the blue pixel PB3 have different widths in contact with the light shielding portion. The color filter CFB1 is in contact with the surface SF3 between the end B31E of the light-shielding portion B31 and the end B32E of the light-shielding portion B32.

In the example shown in fig. 15, the color filter CFB1 of the blue pixel PB1 faces the pixel electrode PE12, and the concave portion CC1 faces the pixel electrode PE 23. The liquid crystal layer LC has a first thickness T1 at the center of the blue pixel PB1 and a second thickness T2 at the center of the white pixel PW 2. The second thickness T2 is thicker than the first thickness T1. The second substrate SUB2 has a third thickness T3 at the center of the blue pixel PB1 and a fourth thickness T4 at the center of the white pixel PW 2. The fourth thickness T4 is thinner than the third thickness T3.

The laminated body formed by the color filter CFB1 in contact with the light shielding portion B31 has the seventh thickness T7 as the maximum thickness. The laminated body formed by the color filter CFB1 in contact with the light shielding portion B32 has the eighth thickness T8 as the maximum thickness. In the illustrated example, the eighth thickness T8 is thinner than the seventh thickness T7. By forming the laminate of the color filter CFB1 and the light-shielding portion B32 adjacent to the white pixel PW2 thin, the raw material for forming the overcoat OC is made to easily flow into the white pixel PW 2.

The overcoat OC is in contact with the color filters CFB1 and CFB3, and the light-shielding portions B31 to B33, respectively, and is in contact with the surface SF3 between the light-shielding portions B32 and B33. The third width W13 of the light shielding portion B32 in contact with the overcoat OC is larger than the fourth width W14 of the light shielding portion B33 in contact with the overcoat OC. In other words, the contact area of the light shielding portion B32 with the overcoat OC is larger than the contact area of the light shielding portion B33 with the overcoat OC.

Focusing on the light shielding portion B32, the second width W12 is smaller than the third width W13. In other words, the contact area of the color filter CFB1 with the light shielding portion B32 is smaller than the contact area of the overcoat OC with the light shielding portion B32. Focusing on the light-shielding portion B31, the contact area of the color filter CFB1 and the light-shielding portion B31 is larger than the contact area of the overcoat OC and the light-shielding portion B31.

In the example shown in fig. 15, the light-shielding portion B31 corresponds to a fifth light-shielding portion, the light-shielding portion B32 corresponds to a sixth light-shielding portion, the light-shielding portion B33 corresponds to a seventh light-shielding portion, the color filter CFB1 of the blue pixel PB1 corresponds to a third coloring layer, the pixel electrode PE21 corresponds to a fourth pixel electrode, and the overcoat OC corresponds to a transparent resin layer. The blue pixel PB1 corresponds to a first opening, and the white pixel PW2 corresponds to a second opening.

Fig. 16 is a diagram showing the thickness distribution of the color filter CFB in contact with the light-shielding portions B31 and B32 shown in fig. 15. The horizontal axis is a position along the line G-H of fig. 4, and the vertical axis is the thickness (μm). The thickness is based on plane SF 3. The light-shielding portions B31 and B32 were 1.5 μm thick, and the color filter CFB was 2.3 μm thick.

H in the figure corresponds to the distribution in the case where the first width W11 is 7.5 μm and the second width W12 is 5.0 μm as shown in FIG. 15. In the figure, I corresponds to the distribution when the first width W11 is 10.0 μm and the second width W12 is 2.5. mu.m. J in the figure corresponds to the distribution in the case where the first width W11 is 11.5 μm and the second width W12 is 1.0. mu.m. Each of the distributions H to J is roughly thicker on the side close to the end B31E than on the side close to the end B32E. Further, the thickness in the vicinity of the end B32E tends to decrease as the second width W12 decreases. From the viewpoint of thinning the laminate of the color filter CFB and the light shielding portion B32, the second width W12 is preferably 2.5 μm or less as indicated by I and J.

Fig. 17 is a diagram showing thickness distributions of the light shielding portions B31 and B32, the color filter CFB, and the overcoat layer OC. The horizontal axis is a position along the line G-H of fig. 4, and the vertical axis is the thickness (μm). In the blue pixel PB1, the sum of the thickness of the color filter CFB and the thickness of the overcoat OC was about 3.75 μm, the thickness of the overcoat OC in the white pixel PW2 was about 3.65 μm, and a concave portion of about 0.1 μm was formed in the white pixel PW 2.

Fig. 18 is a plan view showing the light-shielding layer BM corresponding to another pixel layout. The illustrated configuration example is different from the configuration example shown in fig. 4 in that the widths of the red pixel PR, the green pixel PG, the blue pixel PB, and the white pixel PW in the first direction X and the width in the second direction Y are equal to each other. However, the light-shielding layer BM in the illustrated example is not considered to be a region overlapping with the main spacers and the sub-spacers. A red color filter CFR is disposed in the red pixels PR1 and PR2, a green color filter CFG is disposed in the green pixels PG1 and PG2, a blue color filter CFB is disposed in the blue pixels PB1 to PB3, and an overcoat OC is disposed in the white pixels PW1 and PW 2. In addition, the color filters of the same color are hatched in the same manner for discrimination.

In the example of the pixel layout configuration, the second chromaticity of the white pixel PW can be adjusted in the same manner as in the above example.

As described above, according to the present embodiment, a display device and a color filter substrate with improved display quality can be provided.

While several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

For example, in the present embodiment, the pixel widths of the red pixel, the green pixel, and the white pixel are the same, but these pixel widths may be different. In this embodiment, the pixel electrodes of the red pixel, the green pixel, and the white pixel have the same shape, but the shapes of the pixel electrodes may be different.

Description of the reference numerals

DSP … display device

PNL … display panel

SUB1 … first substrate AL1 … orientation film

SUB2 … second substrate 20 … insulating substrate BM … light-shielding layer B … light-shielding portion

CF … color filter OC … overcoat AL2 … orientation film

LC … liquid crystal layer

IL … lighting device