阅读说明：本技术 显示装置 (Display device ) 是由 中冈知球 加边正章 于 2020-02-20 设计创作，主要内容包括：本实施方式的目的在于提供能够抑制显示品质的降低的显示装置。本实施方式的显示装置具备：显示面板,具备具有多个像素的显示部和包围所述显示部的非显示部；照明装置,对所述显示面板进行照明；以及色分离元件,设置于所述显示面板与所述照明装置之间,所述显示面板在所述非显示部具备开口部,所述色分离元件具备：与所述像素重叠的第一元件和与所述开口部重叠的第二元件,所述第一元件将来自所述照明装置的照明光分离为多个色的光并向所述像素照射,所述第二元件将来自所述照明装置的照明光分离为多个色的光并向所述开口部照射。(An object of the present embodiment is to provide a display device capable of suppressing a reduction in display quality. The display device of the present embodiment includes: a display panel including a display unit having a plurality of pixels and a non-display unit surrounding the display unit; an illumination device that illuminates the display panel; and a color separation element provided between the display panel and the illumination device, the display panel including an opening in the non-display portion, the color separation element including: and a second element overlapping the opening, the first element separating the illumination light from the illumination device into a plurality of colors of light and irradiating the light to the pixel, and the second element separating the illumination light from the illumination device into a plurality of colors of light and irradiating the light to the opening.)

1. A display device is provided with:

a display panel is provided with: a display section having a plurality of pixels; and a non-display portion surrounding the display portion;

an illumination device that illuminates the display panel; and

a color separation element disposed between the display panel and the illumination device,

the display panel includes an opening in the non-display portion,

the color separation element includes: a first element overlapping the pixel; and a second element overlapping with the opening portion,

the first element separates illumination light from the illumination device into a plurality of colors of light and irradiates the pixels,

the second element separates illumination light from the illumination device into a plurality of colors of light and irradiates the opening with the light.

2. The display device according to claim 1,

the first element and the second element are diffraction elements having a concave-convex shape, respectively.

3. The display device according to claim 1,

the display panel includes: a first substrate; a second substrate; and a liquid crystal layer between the first and second substrates,

the first substrate is disposed between the color separation element and the second substrate,

the first element and the second element are formed on a side of the color separation element facing the first substrate.

4. The display device according to claim 3,

the display device includes:

an adhesive member that adheres the color separation element to the first substrate; and

a polarizing plate disposed between the color separation element and the first substrate,

the polarizing plate is adhered to the first substrate,

the adhesive member has a thickness greater than that of the polarizing plate.

5. The display device according to claim 3,

the display device includes:

an adhesive member that adheres the color separation element to the first substrate; and

a polarizing plate having a first surface and a second surface,

the color separation element is disposed between the polarizing plate and the first substrate,

the polarizing plate is bonded to the color separation element.

6. The display device according to claim 1,

the display panel includes: a first substrate; a second substrate; and a liquid crystal layer between the first and second substrates,

the first substrate is disposed between the color separation element and the second substrate,

the first element and the second element are formed on the side opposite to the side facing the first substrate in the color separation element.

7. The display device according to claim 6,

the display device includes: and a polarizing plate disposed between the color separation element and the first substrate.

8. The display device according to claim 6,

the display device includes: a polarizing plate having a first surface and a second surface,

the color separation element is disposed between the polarizing plate and the first substrate.

9. The display device according to claim 1,

the display panel includes: a first substrate; a second substrate; and a liquid crystal layer between the first and second substrates,

the second substrate includes: a light-shielding layer,

the opening is a through hole formed in the light shielding layer.

10. The display device according to claim 1,

the display panel includes: a first substrate; a second substrate; and a liquid crystal layer between the first and second substrates,

the first substrate includes: a metal layer,

the opening is a through hole formed in the metal layer.

11. The display device according to claim 1,

the display panel does not include a light shielding member between the second element and the opening portion.

12. The display device according to claim 1,

the color separation element includes: a transparent substrate; and a resin layer laminated on the transparent substrate,

the first element and the second element are formed on the resin layer.

13. The display device according to claim 1,

the color separation element includes: a transparent base material, a transparent substrate,

the first element and the second element are formed on the same side of the transparent substrate.

14. The display device according to claim 1,

the second element is disposed at a plurality of positions around the first element.

15. The display device according to claim 1,

the first element has a periodic concavo-convex shape,

the second element has the same concavo-convex shape as the unit element of at least one cycle of the first element.

16. The display device according to claim 1,

the opening portion has a first opening portion and a second opening portion arranged in a first direction,

the length of the first opening in a second direction intersecting the first direction is different from the length of the second opening in the second direction.

Technical Field

Embodiments of the present invention relate to a display device.

Background

For example, in a liquid crystal display device, a pair of substrates are aligned based on alignment marks formed on both sides and then bonded to each other. In this case, since the alignment marks of both sides are separated in the depth of focus direction, it is difficult to align both sides with an error of several micrometers while observing them simultaneously.

To solve the above problem, as an example, a display device is proposed, which includes: a first substrate formed with an alignment mark and a second substrate provided with a condensing lens. According to such a display device, incident light is condensed on the alignment mark by the condenser lens, a condensed image is formed on the scale mark of the alignment mark, and alignment is performed while observing the condensed image and the alignment mark.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 10-149110

Disclosure of Invention

Technical problem to be solved by the invention

An object of the present embodiment is to provide a display device capable of suppressing a reduction in display quality.

Technical solution for solving technical problem

According to the present embodiment, there is provided a display device including: a display panel including a display unit having a plurality of pixels and a non-display unit surrounding the display unit; an illumination device that illuminates the display panel; and a color separation element provided between the display panel and the illumination device, the display panel including an opening in the non-display portion, the color separation element including: and a second element overlapping the opening, the first element separating the illumination light from the illumination device into a plurality of colors of light and irradiating the light to the pixel, and the second element separating the illumination light from the illumination device into a plurality of colors of light and irradiating the light to the opening.

Effects of the invention

According to the present embodiment, a display device capable of suppressing a reduction in display quality can be provided.

Drawings

Fig. 1 is a diagram showing an example of a configuration of a display device DSP according to the present embodiment.

Fig. 2 is a sectional view of the display device DSP showing the 1 st configuration example.

Fig. 3 is a diagram for explaining the concept of color separation by the first element 110 of the color separation element 100.

Fig. 4 is a diagram for explaining a method of aligning the display panel PNL and the color separation element 100.

Fig. 5 is a diagram for explaining the concept of color separation by the second element 120 of the color separation element 100.

Fig. 6 is a view showing an example of a pattern observed when observing the opening OP.

Fig. 7 is a sectional view of the display device DSP showing the 2 nd configuration example.

Fig. 8 is a sectional view of the display device DSP showing the 3 rd configuration example.

Fig. 9 is a sectional view of the display device DSP showing the 4 th configuration example.

Fig. 10 is a sectional view of the display device DSP showing the 5 th configuration example.

Fig. 11 is a sectional view of the display device DSP showing the 6 th configuration example.

Fig. 12 is a sectional view of the display device DSP showing the 7 th configuration example.

Fig. 13 is a sectional view of the display device DSP showing the 8 th configuration example.

Fig. 14 is a sectional view of the display device DSP showing the 9 th configuration example.

Fig. 15 is a sectional view of the color separation element 100 according to the 10 th configuration example.

Fig. 16 is a plan view of the color separation element 100 and the display panel PNL according to the 11 th configuration example.

Fig. 17 is an enlarged plan view of the second element 120 and the opening OP shown in fig. 16.

Fig. 18 is a plan view showing the color separation element 100 and the display panel PNL of the 12 th configuration example.

Fig. 19 is an enlarged plan view of the second element 120 and the opening OP shown in fig. 18.

Fig. 20 is a diagram showing the second element 120 of the 13 th configuration example.

Fig. 21 is a diagram showing the second element 120 of the 14 th configuration example.

Fig. 22 is a diagram showing the second element 120 of the 15 th configuration example.

Fig. 23 shows an opening OP of the 16 th configuration example.

Detailed Description

The present embodiment will be described below with reference to the drawings. The disclosure is merely an example, and any person skilled in the art can easily conceive of the invention while keeping the gist of the invention appropriately modified, and the invention should be included in the scope of the invention. In addition, although the drawings schematically show the width, thickness, shape, and the like of each part as compared with the actual embodiment in order to make the description clearer, 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 the components that perform the same or similar functions as those described above in the already described drawings, and the overlapping detailed description may be omitted as appropriate.

Fig. 1 is a diagram showing an example of a configuration 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 the main surface of the display device DSP, and the third direction Z corresponds to a thickness direction of the display device DSP. The observation position for observing the display device DSP is located on the tip side of the arrow indicating the third direction Z, and an X-Y plane defined by the first direction X and the second direction Y from the observation position is referred to as a plan view.

The display device DSP includes a display panel PNL, an illumination device IL, and a color separation element 100. The illumination device IL, the color separation element 100, and the display panel PNL are arranged in this order along the third direction Z. In other words, the color separation element 100 is disposed between the illumination device IL and the display panel PNL.

The display panel PNL is, for example, a liquid crystal panel. 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 display unit DA includes a plurality of pixels PX arranged in a matrix in the first direction X and the second direction Y.

As shown in fig. 1 in an enlarged manner, 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 electrically connected to the scanning line G and the signal line S. The pixel electrode PE is electrically connected to the switching element SW. The common electrode CE is provided in common to the plurality of pixel electrodes PE. The liquid crystal layer LC is driven by an electric field generated between the pixel electrode PE and the common electrode CE. The 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.

The illumination device IL is configured to illuminate the display panel PNL. The illumination device IL emits illumination light LW almost parallel in the third direction Z toward the color separation element 100. The illumination light LW is, for example, white light.

The color separation element 100 is configured to separate the illumination light LW into a plurality of colors. In one example, the color separation element 100 separates the illumination light LW into blue light LB, green light LG, and red light LR, and emits the separated light to the display panel PNL. The separated blue light LB, green light LG, and red light LR are arranged in the first direction X, for example, and are collected in a line shape along the second direction Y.

[ 1 st configuration example ]

Fig. 2 is a sectional view of the display device DSP showing the 1 st configuration example. The display panel PNL includes a first substrate SUB1, a second substrate SUB2, and a liquid crystal layer LC. The first substrate SUB1 and the second substrate SUB2 are bonded to each other by a seal SL in the non-display portion NDA. The liquid crystal layer LC is positioned between the first substrate SUB1 and the second substrate SUB2, and is sealed by a sealing member SL. The display panel PNL includes, as pixels PX in the display unit DA, for example: a pixel PXR displaying red, a pixel PXG displaying green, and a pixel PXB displaying blue. The pixels PXR, PXG, PXB are arranged along the first direction X. The display panel PNL includes an opening OP in the non-display portion NDA.

In the example shown in fig. 2, only the transparent substrate 10 constituting the first substrate SUB1 is shown, but the first substrate SUB1 includes the scanning lines G, the signal lines S, the switching elements SW, the pixel electrodes PE, and the like shown in fig. 1 in each of the pixels PXR, PXG, and PXB. The first substrate SUB1 includes a transparent insulating film and an alignment film, not shown, between the transparent substrate 10 and the liquid crystal layer LC. The second substrate SUB2 includes a transparent substrate 20, color filters CFR, CFG, CFB, and a light-shielding layer BM. The second substrate SUB2 includes an alignment film, not shown, between the transparent substrate 20 and the liquid crystal layer LC. The transparent substrates 10 and 20 are insulating substrates such as glass substrates and plastic substrates. The red color filter CFR is disposed in the pixel PXR, the green color filter CFG is disposed in the pixel PXG, and the blue color filter CFB is disposed in the pixel PXB. The light-shielding layer BM is provided between the color filters CFR, CFG, and CFB adjacent to each other in the display portion DA. The light-shielding layer BM is also provided in the non-display portion NDA. The opening OP is a through hole formed in the light-shielding layer BM on the outer side of the seal SL. In the example shown in fig. 2, the opening OP includes a first opening OP1, a second opening OP2, and a third opening OP 3. The first to third openings OP1 to OP3 are arranged in the first direction X.

The color separation element 100 is disposed between the illumination device IL and the first substrate SUB 1. In addition, the first substrate SUB1 is disposed between the color separation element 100 and the second substrate SUB 2. The color separation element 100 is provided with a first element 110 and a second element 120. The first element 110 is disposed to overlap the pixels PXR, PXG, PXB in the third direction Z. The second element 120 is disposed to overlap the first to third opening portions OP1 to OP3 of the opening portion OP in the third direction Z. The first substrate SUB1 does not include a light shielding member such as a metal wiring or an electrode between the second element 120 and the opening OP.

The first element 110 and the second element 120 are each a diffraction element having an irregular shape in the third direction Z. The first element 110 and the second element 120 are formed on the same side in the color separation element 100, for example, on the side facing the first substrate SUB1 in the example shown in fig. 2. Such a color separation element 100 is bonded to the first substrate SUB1 by a bonding member AD. In the case where the adhesive member AD and the seal member SL are opaque or have light scattering properties, the first element 110 and the second element 120 are disposed so as not to overlap with either the seal member SL or the adhesive member AD in the third direction Z. In the example shown in fig. 2, the second member 120 is disposed between the adhesive member AD and the sealing member SL in the first direction X.

The polarizing plate PL1 is disposed between the color separation element 100 and the first substrate SUB1, and is bonded to the first substrate SUB 1. The polarizing plate PL1 is disposed across the display section DA, and overlaps the first element 110 in the third direction Z. The thickness T1 of the adhesive piece AD is greater than the thickness T2 of the polarizing plate PL 1. Thus, the first element 110 is separated from the first element 110.

A polarizing plate PL2 is provided across the display section DA and is bonded to the second substrate SUB 2. Further, the polarizing plates PL1, PL2 are disposed so as not to overlap with the second element 120 in the third direction Z.

In such a display device DSP, the illumination light LW from the illumination device IL is diffracted by the first element 110 and the second element 120, and is separated into a plurality of colors as shown in fig. 1. The first element 110 irradiates a plurality of colors of light, for example, blue light LB, green light LG, and red light LR shown in fig. 1, to a blue pixel PXB, a green pixel PXG, and a red pixel PXR, respectively. The second element 120 irradiates the light of the plurality of colors to the first to third openings OP1 to OP3 of the opening OP, respectively. Details of these will be described later.

Fig. 3 is a diagram for explaining the concept of color separation by the first element 110 of the color separation element 100. The first element 110 includes a plurality of unit elements UE arranged in one direction. The direction in which the plurality of unit elements UE are arranged is, for example, the first direction X described above. The unit elements UE have the same concave-convex shape. In other words, the first element 110 has a periodic concave-convex shape, and one period thereof constitutes the unit element UE. The unit element UE has the following functions: when the illumination light LW is incident from the illumination device IL almost perpendicularly to the color separation element 100, the illumination light LW is separated into blue light LB, green light LG, and red light LR. The first unit element UE1, the second unit element UE2, and the third unit element UE3 correspond to unit elements arranged with a shift of 1/3 cycles. The first cell element UE1 mainly diffracts and collects red light LR having a red wavelength out of the illumination light LW. The second cell element UE2 mainly diffracts and collects green light LG having a green wavelength in the illumination light LW. The third unit element UE3 mainly diffracts and collects blue light LB having a blue wavelength among the illumination light LW. It is needless to say that the first to third unit elements UE1 to UE3 diffract not only light of the main wavelength but also light of other wavelengths.

The display panel PNL is disposed in the vicinity of a position where light of each color is condensed by the color separation element 100. The display panel PNL includes a plurality of main pixels MP arranged in one direction. The main pixel MP includes pixels PXR, PXG, and PXB arranged in one direction, respectively. The direction in which the pixels PXR, PXG, and PXB are arranged is the same as the direction in which the cell elements UE are arranged. The main pixel MP is arranged to overlap with one unit element UE. The condensed red light LR is irradiated to the pixel PXR. The condensed green light LG is irradiated to the pixel PXG. The collected blue light LB is irradiated to the pixel PXB.

Next, the second element 120 will be explained. The second element 120 is used for alignment when the display panel PNL is bonded to the color separation element 100. First, an example of a method of alignment will be described.

Fig. 4 is a diagram for explaining a method of aligning the display panel PNL and the color separation element 100. The color separation element 100 is supported by a support 210. The support member 210 has a through hole TH1 overlapping the second element 120. The display panel PNL is supported by the supporter 220. The support 220 has a through hole TH2 overlapping the opening OP.

In the alignment, the first element 110 and the second element 120 are opposite to the display panel PNL in a state where the color separation element 100 is separated from the display panel PNL. When the holder 210 is illuminated with the reference light L0 from below (the side opposite to the side supporting the color separation element 100), the reference light L0 passes through the through holes TH1 and enters the second element 120. The reference light L0 is parallel light, for example, white light, as in the illumination light LW described above. The second element 120 separates the reference light L0 into a plurality of colors and condenses them.

On the other hand, the opening OP of the display panel PNL is observed with a microscope or the like from the direction indicated by the arrow a in the figure through the through hole TH 2. The display panel PNL is aligned with the color separation element 100 so that the light of each color separated by the second element 120 is condensed at a predetermined position of the opening OP. After the positioning is completed, the display panel PNL and the color separation element 100 are brought close to each other, and both are bonded by the adhesive AD.

Fig. 5 is a diagram for explaining the concept of color separation by the second element 120 of the color separation element 100. The second element 120 has, for example, the same shape as one unit element UE (one period) of the first element 110 shown in fig. 3. The second element 120 may have the same shape as the one or more (one cycle or more) unit elements UE. The second element 120 separates the reference light L0 into blue light LB, green light LG, and red light LR, and collects the separated light.

When the alignment of the display panel PNL and the color separation element 100 is completed, the red light LR condensed in the display panel PNL is irradiated to the first opening OP 1. The condensed green light LG is irradiated to the second opening OP 2. The condensed blue light LB is applied to the third opening OP 3. In other words, the focus of the second element 120 is set in the vicinity of the first to third openings OP1 to OP 3.

Fig. 6 is a view showing an example of a pattern observed when observing the opening OP. Note that, in reality, the light-shielding layer BM of the display panel PNL is provided over substantially the entire area of the non-display portion NDA excluding the opening portion OP, and here, a part of the light-shielding layer BM is illustrated for convenience of description.

The red light LR, the green light LG, and the blue light LB are condensed in a line along the second direction Y. The first opening OP1, the second opening OP2, and the third opening OP3 are each formed in a slit shape (or a rectangular shape) extending in the second direction Y.

In a state where the positioning is completed, the condensed red light LR is observed as a linear condensed light image at almost the center of the first opening OP 1. Similarly, the condensed green light LG is observed as a linear condensed image at substantially the center of the second opening OP2, and the condensed blue light LB is observed as a linear condensed image at substantially the center of the third opening OP 3.

In aligning the display panel PNL with the color separation element 100, for example, a case is assumed in which the alignment mark provided on the first substrate SUB1 of the display panel PNL and the alignment mark provided on the color separation element 100 are observed through a microscope. In this case, the alignment marks are separated in the depth of focus direction by a distance equal to or greater than the thickness of the first substrate SUB 1. Therefore, it is difficult to observe both alignment marks at the same time.

According to the present embodiment, the reference light L0 is separated into a plurality of colors by the color separation element 100, and the light of each color is condensed at the opening OP of the display panel PNL. Therefore, by focusing the microscope on the opening OP, the alignment can be performed while observing the condensed image overlapping the opening OP. In other words, the color separation element 100 separated in the depth direction of focus can be observed and aligned with the display panel PNL by a single-focus microscope.

The second element 120 for alignment has the same shape as the cell element UE of the first element 110 that condenses light of a desired color in each of the pixels PXR, PXG, and PXB. Therefore, the second element 120 can condense light of a plurality of colors at intervals equal to the pixel pitch. This enables highly accurate positioning within an allowable range of the order of micrometers.

Next, another configuration example will be explained. The following configuration examples 2 to 7 will be described focusing on the first substrate SUB1, the color separation element 100, and the polarizing plate PL1 of the display panel PNL. Note that, although illustration of the liquid crystal layer LC, the second substrate SUB2, and the like is omitted, the structure of the display panel PNL is the same as that of the 1 st configuration example shown in fig. 2.

[ 2 nd constitution example ]

Fig. 7 is a sectional view of the display device DSP showing the 2 nd configuration example. Compared with the 1 st configuration example shown in fig. 2, the 2 nd configuration example shown in fig. 7 is different in that: the color separation element 100 is disposed between the polarizing plate PL1 and the first substrate SUB 1. The color separation element 100 is bonded to the first substrate SUB1 by a bonding member AD. In the color separation element 100, the first element 110 and the second element 120 are formed on the side facing the first substrate SUB 1. The color separation element 100 has a flat surface 100A on the side opposite the first element 110 and the second element 120.

The polarizing plate PL1 is located between the illumination device IL and the color separation element 100, and is bonded to the plane 100A of the color separation element 100. In configuration example 2, the polarizing plate PL1 is provided on the entire surface of the plane 100A.

In the configuration example 2, the same effects as those of the above configuration are obtained.

[ 3 rd configuration example ]

Fig. 8 is a sectional view of the display device DSP showing the 3 rd configuration example. Compared with the 2 nd configuration example shown in fig. 7, the 3 rd configuration example shown in fig. 8 is different in that: the polarizing plate PL1 is provided in a region overlapping the display section DA in the plane 100A. In addition, the polarizing plate PL1 does not overlap with the second element 120 in the third direction Z.

In the configuration example 3, the same effects as those of the above configuration are obtained. In addition, the second element 120 does not overlap the polarizing plate PL1, and therefore, it is possible to suppress part of the light directed toward the second element 120 from being absorbed by the polarizing plate PL 1.

[ 4 th configuration example ]

Fig. 9 is a sectional view of the display device DSP showing the 4 th configuration example. Compared with the 1 st configuration example shown in fig. 2, the 4 th configuration example shown in fig. 9 is different in that: in the color separation element 100, the first element 110 and the second element 120 are formed on the opposite side of the side facing the first substrate SUB 1. In other words, the first element 110 and the second element 120 are disposed toward the illumination device IL side. The polarizing plate PL1 is disposed between the color separation element 100 and the first substrate SUB 1. In the example shown in fig. 9, the polarizing plate PL1 is bonded to the transparent substrate 10, but may be bonded to the color separation element 100.

In the color separation element 100, the plane 100A faces the polarizing plate PL1, and is adhered to the polarizing plate PL1 by a transparent adhesive piece AD 1. The protector 30 is disposed between the illumination device IL and the color separation element 100, and is bonded to the color separation element 100 by the bonding member AD 2. The protective member 30 is a transparent substrate such as a glass substrate or a plastic substrate. The protector 30 is provided to be separated from the first and second elements 110 and 120, and to face the first and second elements 110 and 120, protecting the first and second elements 110 and 120. The illumination means IL may also be glued to the protection 30.

In the 4 th configuration example, the same effects as those of the above configuration are obtained. Further, the illumination device IL can be disposed close to the display panel PNL by bonding the illumination device IL to the protector 30. In addition, even when the illumination device IL and the display panel PNL are close to each other, damage to the first element 110 and the second element 120 can be suppressed by the protector 30.

[ constitution example 5 ]

Fig. 10 is a sectional view of the display device DSP showing the 5 th configuration example. Compared with the 4 th configuration example shown in fig. 9, the 5 th configuration example shown in fig. 10 is different in that: the protector 30 is omitted.

In the 5 th configuration example, the same effects as those of the above configuration are obtained. In addition, the number of parts can be reduced, and the cost can be reduced. Such a 5 th configuration example is preferably suitable for a case where the illumination device IL is disposed apart from the color separation element 100, for example.

[ 6 th configuration example ]

Fig. 11 is a sectional view of the display device DSP showing the 6 th configuration example. Compared with the 4 th configuration example shown in fig. 9, the 6 th configuration example shown in fig. 11 is different in that: the color separation element 100 is disposed between the polarizing plate PL1 and the first substrate SUB 1. The color separation element 100 is bonded to the first substrate SUB1 by a bonding member AD 1. The polarizing plate PL1 is located between the illumination device IL and the color separation element 100, and is bonded to the color separation element 100 by an adhesive member AD 2.

In other words, the polarizing plate PL1 is replaced with the protector 30 described in the configuration example 4. The polarizing plate PL1 is provided so as to be separated from the first element 110 and the second element 120, and faces the first element 110 and the second element 120, protecting the first element 110 and the second element 120. The polarizing plate PL1 is preferably separated from the color separation element 100 in a region overlapping the display portion DA, and has high rigidity from the viewpoint of suppressing deterioration of optical characteristics due to deformation.

In the 6 th configuration example, the same effects as those of the above configuration are obtained.

[ 7 th configuration example ]

Fig. 12 is a sectional view of the display device DSP showing the 7 th configuration example. Compared with the 6 th configuration example shown in fig. 11, the 7 th configuration example shown in fig. 12 is different in that: the color separation element 100 includes a resin layer 102 directly formed on the lower surface 10A of the transparent substrate 10. The first element 110 and the second element 120 are formed on the resin layer 102. The polarizing plate PL1 is bonded to the resin layer 102 by a bonding member AD 2.

In the 7 th configuration example, the same effects as those of the above configuration are obtained. In addition, the color separation element 100 can be made thin and light.

[ 8 th constitution example ]

Fig. 13 is a sectional view of the display device DSP showing the 8 th configuration example. Compared with the 1 st configuration example shown in fig. 2, the 8 th configuration example shown in fig. 13 is different in that: the first substrate SUB1 includes a metal layer ML, and the opening OP is a through hole formed in the metal layer ML. The metal layer ML may be formed in an island shape not connected to any of the wirings and the electrodes, or may be electrically connected to a wiring of a predetermined potential. Preferably, the metal layer ML is formed of a metal material having a relatively low reflectance such as molybdenum.

In the example shown in fig. 13, the opening OP includes a first opening OP1, a second opening OP2, and a third opening OP 3. The second element 120 is disposed to overlap the opening OP in the third direction Z. The first substrate SUB1 does not include a light shielding member such as a metal wiring or an electrode between the second element 120 and the opening OP.

In the 8 th configuration example, the same effects as those of the above configuration are obtained.

[ constitution example 9 ]

Fig. 14 is a sectional view of the display device DSP showing the 9 th configuration example. Compared with the 8 th configuration example shown in fig. 13, the 9 th configuration example shown in fig. 14 is different in that: the second substrate SUB2 does not overlap the opening OP.

In the 9 th configuration example, the same effects as those of the above configuration are obtained. The opening OP can be observed without passing through the second substrate SUB 2.

[ configuration example 10; color separation element 100)

Fig. 15 is a sectional view of the color separation element 100 according to the 10 th configuration example.

In the example shown in fig. 15 (a), the color separation element 100 includes a transparent substrate 101 and a transparent resin layer 102. The resin layer 102 is laminated on the transparent substrate 101. The first element 110 and the second element 120 are formed on the resin layer 102.

In the example shown in fig. 15 (B), the color separation element 100 includes a transparent base 101. The first element 110 and the second element 120 are formed on the same side of the transparent substrate 101.

The color separation elements 100 shown in fig. 15 (a) and (B) can be applied to the above-described 1 st to 9 th configuration examples.

In each of the above-described configuration examples in which the color separation element 100 is bonded to the first substrate SUB1, the thermal expansion coefficient of the transparent base 101 of the color separation element 100 is preferably equal to that of the transparent substrate 10 of the first substrate SUB1 from the viewpoint of suppressing deformation of the color separation element 100 and the first substrate SUB1 due to thermal expansion.

[ 11 th configuration example ]

Fig. 16 is a plan view of the color separation element 100 and the display panel PNL according to the 11 th configuration example. Fig. 16 (a) shows the color separation element 100. The second element 120 is disposed at a plurality of positions around the first element 110. In the example shown in fig. 16, the first element 110 is disposed across a rectangular area. The second elements 120 are respectively disposed in the vicinity of four corners of the first element 110. The first element 110 is located between two second elements 120 along the second direction Y.

Fig. 16 (B) shows the display panel PNL. The display portion DA is provided across a region overlapping with the first element 110. The opening portions OP are disposed in a region overlapping with the second element 120 and at a plurality of positions of the non-display portion NDA. For example, the number of the openings OP is the same as the number of the second elements 120. When the color separation element 100 and the display panel PNL are superimposed, the second elements 120 are superimposed on the openings OP, as described with reference to fig. 2 and the like.

In this way, the color separation element 100 and the display panel PNL are aligned based on the second elements 120 and the openings OP provided at a plurality of positions. Therefore, the positioning can be performed with high accuracy not only in the first direction X and the second direction Y but also in the rotational direction (θ direction) within the X-Y plane. In fig. 16, an example in which four second elements 120 are provided has been described, but from the viewpoint of performing the alignment with high accuracy, at least two second elements 120 are preferably provided in the diagonal direction of the first element 110.

Fig. 17 is an enlarged plan view of the second element 120 and the opening OP shown in fig. 16. Fig. 17 (a) shows a part of the first element 110 and the second element 120. The first element 110 includes a plurality of unit elements UE arranged in the first direction X. Concave-convex portion C1 of unit element UE extends along second direction Y. The second element 120 is disposed on the same straight line as the unit element UE of the first element 110. That is, the concave-convex portion C2 of the second element 120 extends along the second direction Y. The concave-convex portions C1 and C2 are disposed on the same line along the second direction Y and have the same shape. Therefore, the second element 120 can be easily formed when the first element 110 is formed. In the example shown in fig. 17 (a), the first element 110 and the second element 120 are separated in the second direction Y, but the first element 110 and the second element 120 may be formed continuously.

Fig. 17 (B) shows the pixels PXR, PXG, and PXB and the opening OP. The pixels PXR, PXG, PXB are arranged along the first direction X and are respectively divided by the light shielding layer BM. Among the openings OP, the first opening OP1, the second opening OP2, and the third opening OP3 are aligned in the first direction X. The first opening portion OP1 and the pixels PXR are disposed on the same straight line along the second direction Y. The second opening portion OP2 and the pixels PXG are disposed on the same straight line along the second direction Y. The third opening portion OP3 and the pixels PXB are disposed on the same straight line along the second direction Y.

The display panel PNL of the 11 th configuration example and the color separation element 100 are aligned so that the condensed light image of the red light LR overlaps the first opening OP1, the condensed light image of the green light LG overlaps the second opening OP2, and the condensed light image of the blue light LB overlaps the third opening OP3 in each of the plurality of openings OP. In other words, at the end of the alignment of the display panel PNL and the color separation element 100, the red light LR, the green light LG, and the blue light LB are observed to be sequentially arranged in the first direction X in all the openings OP. On the other hand, when the display panel PNL is displaced from the color separation element 100, the order of colors observed in some of the openings OP is different.

By performing the alignment based on the plurality of second elements 120 and the plurality of openings OP in this manner, the first element 110 can be accurately aligned with the pixels PXR, PXG, and PXB.

[ 12 th configuration example ]

Fig. 18 is a plan view showing the color separation element 100 and the display panel PNL of the 12 th configuration example. Fig. 18 (a) shows the color separation element 100. The color separation element 100 of the 12 th configuration example is different from the color separation element 100 of the 11 th configuration example in that: the second element 120 is misaligned in the first direction X with respect to the first element 110. The first element 110 is not located between two second elements 120 arranged in the second direction Y.

Fig. 18 (B) shows the display panel PNL. The display portion DA is provided across a region overlapping with the first element 110. The opening OP is provided in a region overlapping with the second element 120.

Fig. 19 is an enlarged plan view of the second element 120 and the opening OP shown in fig. 18. Fig. 19 (a) shows a part of the first element 110 and the second element 120. In the first element 110, a plurality of unit elements UE are arranged at a pitch p along the first direction X. The second elements 120 are located at spaced apart positions along the first direction X by a distance p n relative to the first elements 110. Further, n is a positive integer. When n is zero, the configuration corresponds to the 11 th configuration example shown in fig. 17.

Fig. 19 (B) shows the pixels PXR, PXG, and PXB and the opening OP. The pixels PXR, PXG, PXB are arranged along the first direction X. In addition, pixels PXR displaying the same color, for example, red, are arranged at a pitch p along the first direction X. The pixels PXG and PXB of other colors are also arranged at the same pitch p as the pixel PXR. The first opening OP1 is provided at a position separated from the pixel PXR by a distance of p n along the first direction X. The distance between the second opening OP2 and the pixel PXG and the distance between the third opening OP3 and the pixel PXB are also the same as the distance between the first opening OP1 and the pixel PXR.

In the 12 th configuration example, the same effects as those in the 11 th configuration example are obtained.

[ configuration example 13; second member 120)

Fig. 20 is a diagram showing the second element 120 of the 13 th configuration example.

Fig. 20 (a) is a plan view of the second element 120. The second element 120 includes a unit element UE of one cycle of the first element 110 shown in fig. 3.

Fig. 20 (B) is a sectional view of the second element 120. This second element 120 has, for example, the same shape as the second cell element UE2 shown in fig. 3, and mainly diffracts and condenses the green light LG. As described with reference to fig. 3, the second cell element UE2 includes a part of the first cell element UE1, and thus diffracts and collects the red light LR. Since the second cell element UE2 includes a part of the third cell element UE3, the blue light LB is diffracted and condensed. The intensity of the red light LR condensed by the second cell element UE2 is lower than that of the first cell element UE 1. The intensity of the blue light LB condensed by the second cell element UE2 is lower than that of the third cell element UE 3.

Fig. 20 (C) is a view showing a condensed image of the opening OP. The second opening OP2 clearly shows a condensed image of the green light LG. On the other hand, the condensed image of the red light LR at the first opening OP1 and the condensed image of the blue light LB at the third opening OP3 are not clearly observed as the condensed image of the green light LG because the light intensity is weak. As described above, the alignment mark can be observed by one color of light among the red light LR, the green light LG, and the blue light LB.

[ 14 th configuration example; second member 120)

Fig. 21 is a diagram showing the second element 120 of the 14 th configuration example.

Fig. 21 (a) is a plan view of the second element 120. The second element 120 includes 2/3 cycles of the element UE in addition to the one cycle of the element UE of the first element 110 shown in fig. 3. In other words, the second element 120 includes all the first unit elements UE1, all the second unit elements UE2, and all the third unit elements UE 3.

Fig. 21 (B) is a sectional view of the second element 120. In the second element 120, the red light LR is mainly diffracted and condensed by the first cell element UE1, the green light LG is mainly diffracted and condensed by the second cell element UE2, and the blue light LB is mainly diffracted and condensed by the third cell element UE 3. Therefore, the intensities of the red light LR, the green light LG, and the blue light LB condensed by the second element 120 are maximum.

Fig. 20 (C) is a view showing a condensed image of the opening OP. The condensed image of the red light LR at the first opening OP1, the condensed image of the green light LG at the second opening OP2, and the condensed image of the blue light LB at the third opening OP3 are clearly observed.

[ configuration example 15; second member 120)

Fig. 22 is a diagram showing the second element 120 of the 15 th configuration example.

Fig. 22 (a) is a plan view showing the second element 120 and the opening OP. The second element 120 includes a three-cycle unit element UE of the first element 110 shown in fig. 3. In the display panel PNL, three (or three periods) of the opening portions OP are formed corresponding to the second elements 120. When the second element 120 includes the unit elements UE having a plurality of cycles, the opening OP is preferably formed in the display panel PNL at the same cycle as the second element 120. When the alignment of the display panel PNL and the color separation element 100 is completed, the red light LR, the green light LG, and the blue light LB observed as being sequentially aligned in the first direction X are observed in all the openings OP.

On the other hand, when the display panel PNL and the color separation element 100 are displaced from each other in the first direction X by one cycle, a condensed image is not observed in some of the openings OP as shown in fig. 22 (B). Thus, even if the observed red light LR, green light LG, and blue light LB are arranged in the first direction X in this order, it can be determined whether or not a cycle shift has occurred.

[ configuration example 16; opening OP)

Fig. 23 shows an opening OP of the 16 th configuration example.

Fig. 23 (a) is a plan view showing the opening OP. The opening OP includes a first opening OP1, a second opening OP2, and a third opening OP3 arranged in the first direction X. The lengths of the first to third openings OP1 to OP3 in the second direction Y are different from each other. In the example shown in fig. 23, the second opening OP2 is longer than the first opening OP1, and the third opening OP3 is longer than the second opening OP 2.

Fig. 23 (B) is a view showing a condensed image of the opening OP. The condensed image of the red light LR at the first opening OP1, the condensed image of the green light LG at the second opening OP2, and the condensed image of the blue light LB at the third opening OP3 have different lengths in the second direction Y. Therefore, the visibility of the condensed image of each color can be improved.

As described above, according to the present embodiment, a display device capable of suppressing a reduction in display quality can be provided.

Further, although several embodiments of the present invention have been described, these embodiments are provided as examples and are not intended to limit the scope of the present invention. These new embodiments may be implemented in other various forms, and various omissions, substitutions, and changes may 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.

Hereinafter, an example of a display device having the structure disclosed in the present specification will be described.

(1) A display device is provided with: a display panel including a display unit having a plurality of pixels and a non-display unit surrounding the display unit; an illumination device that illuminates the display panel; and a color separation element provided between the display panel and the illumination device, the display panel including an opening in the non-display portion, the color separation element including: and a second element overlapping the opening, the first element separating the illumination light from the illumination device into a plurality of colors of light and irradiating the light to the pixel, and the second element separating the illumination light from the illumination device into a plurality of colors of light and irradiating the light to the opening.

(2) In the display device described in (1), each of the first element and the second element is a diffraction element having a concave-convex shape.

(3) The display device according to (1) or (2), wherein the display panel includes a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate, the first substrate is provided between the color separation element and the second substrate, and the first element and the second element are formed on a side of the color separation element facing the first substrate.

(4) The display device according to (3) includes: an adhesive member that adheres the color separation element to the first substrate; and a polarizing plate disposed between the color separation element and the first substrate, the polarizing plate being adhered to the first substrate, the adhesive member having a thickness greater than that of the polarizing plate.

(5) The display device according to (3) includes: an adhesive member that adheres the color separation element to the first substrate; and a polarizing plate, the color separation element being disposed between the polarizing plate and the first substrate, the polarizing plate being adhered to the color separation element.

(6) The display device according to (1) or (2), wherein the display panel includes a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate, the first substrate is provided between the color separation element and the second substrate, and the first element and the second element are formed on a side of the color separation element opposite to a side facing the first substrate.

(7) The display device according to (6) includes: a polarizing plate disposed between the color separation element and the first substrate.

(8) The display device according to (6) is provided with a polarizing plate, and the color separation element is provided between the polarizing plate and the first substrate.

(9) In the display device according to any one of (3) to (8), the second substrate includes a light-shielding layer, and the opening is a through-hole formed in the light-shielding layer.

(10) In the display device according to any one of (3) to (8), the first substrate includes a metal layer, and the opening is a through hole formed in the metal layer.

(11) In the display device of (9) or (10), the first substrate does not include a light-shielding member between the second element and the opening portion.

(12) In the display device according to any one of (1) to (11), the color separation element includes: the liquid crystal display device includes a transparent substrate and a resin layer laminated on the transparent substrate, wherein the first element and the second element are formed on the resin layer.

(13) In the display device according to any one of (1) to (11), the color separation element includes a transparent base material, and the first element and the second element are formed on the same side of the transparent base material.

(14) In the display device according to any one of (1) to (13), the second element is provided at a plurality of positions around the first element.

(15) In the display device according to any one of (1) to (14), the first element has a periodic uneven shape, and the second element has an uneven shape identical to a unit element of at least one period of the first element.

(16) In the display device according to any one of (1) to (15), the opening includes a first opening and a second opening arranged in a first direction, and a length of the first opening in a second direction intersecting the first direction is different from a length of the second opening in the second direction.

Description of reference numerals

And (4) DSP: a display device; PNL: a display panel; OP: an opening part; SUB 1: a first substrate; SUB 2: a second substrate; LC: a liquid crystal layer; 100: a color separation element; 110: a first element; 120: a second element; IL: an illumination device.