阅读说明：本技术 量子点偏光片、显示基板及显示装置 (Quantum dot polaroid, display substrate and display device ) 是由 宋自航 于 2020-06-10 设计创作，主要内容包括：本发明公开了一种量子点偏光片、显示基板及显示装置,所述量子点偏光片包括量子点层、偏光层以及多个光学复合层；其中光学复合层的微结构面包括多个用于汇聚光线的光学结构,并且微结构面与其相邻的功能层之间具有空气层；所述量子点偏光片和采用所述量子点偏光片的显示基板及显示装置能提高量子点大视角光的取出率。(The invention discloses a quantum dot polaroid, a display substrate and a display device, wherein the quantum dot polaroid comprises a quantum dot layer, a polarizing layer and a plurality of optical composite layers; the microstructure surface of the optical composite layer comprises a plurality of optical structures for converging light rays, and an air layer is arranged between the microstructure surface and the adjacent functional layer; the quantum dot polaroid, the display substrate adopting the quantum dot polaroid and the display device can improve the extraction rate of quantum dot large-viewing-angle light.)

1. The quantum dot polarizer is characterized by comprising a quantum dot layer,

A polarizing layer and a plurality of optical composite layers between the quantum dot layer and the polarizing layer, wherein:

one surface of each optical composite layer facing the polarizing layer is a microstructure surface, the microstructure surface comprises a plurality of optical structures arranged in an array, and the optical structures are used for converging light;

and an air layer is arranged between each microstructure surface and the adjacent functional layer, and the functional layer is one of the optical composite layer or the polarizing layer.

2. The quantum dot polarizer of claim 1, wherein the extending direction of the optical structure of each of the optical composite layers forms an angle θ with the polarizing axis of the polarizing layer, and θ is in a range of 0 ℃ to 20 ℃;

the extending direction of the optical structures of the two adjacent optical composite layers forms an included angle alpha, and the range of the alpha is 10-20 ℃.

3. The quantum dot polarizer of claim 1, wherein a structural gap is formed between adjacent optical structures of the same microstructure surface;

each microstructure surface is attached to the adjacent functional layer: the optical structure is attached to the functional layer, and the structural gap is matched with the functional layer to form an air gap;

the air gap constitutes the air layer.

4. The quantum dot polarizer of claim 1 wherein a substrate layer is disposed on a surface of each of the optical composite layers facing the quantum dot layer, the substrate layer being adapted to adhere to the microstructure surface or the quantum dot layer.

5. The quantum dot polarizer of claim 1, wherein the optical structures are prismatic protrusions.

6. The quantum dot polarizer of claim 5 wherein the plurality of optical structures are the same size and are arranged in an array parallel to each other.

7. The quantum dot polarizer of claim 1, wherein the plurality of optical composite layers are a first optical composite layer and a second optical composite layer, wherein:

the first optical composite layer is arranged on the quantum dot layer;

the second optical composite layer is disposed between the first optical composite layer and the polarizing layer.

8. A display substrate comprising a substrate and the quantum dot polarizer of any one of claims 1 to 7 stacked on one surface of the substrate.

9. A display device comprising the quantum dot polarizer of any one of claims 1 to 7, or the display substrate of claim 8.

Technical Field

The invention relates to the technical field of display, in particular to a quantum dot polarizer, a display substrate and a display device.

Background

At present, TFT-LCD display devices have been widely popularized due to their advantages of being light, thin, small, and low in power consumption. Meanwhile, the quantum dots have the advantages of adjustable emission wavelength, concentrated light-emitting peak positions, high color purity, high fluorescence quantum yield and the like, and are one of the nanometer materials which are most concerned by people in recent years. Quantum dots are applied to TFT-LCD by various manufacturers, so that the color gamut of an LCD display is greatly improved, and a quantum dot television plays an important role in the display field. In addition, the application positions of the quantum dots in the TFT-LCD can be classified into various types, wherein the quantum dot polarizer is an important branch.

The quantum dot polaroid can improve the display color gamut and has the advantage of a large viewing angle. However, the low light extraction rate is one of the problems of the combination of the quantum dot film and the polarizer. Due to the light-emitting characteristic of the quantum dots, the quantum dots have a large emergent angle, when the quantum dot film is directly attached to the polarizer, the large-viewing-angle light of the quantum dots is totally reflected on the glass interface of the polarizer and the Cell, the totally reflected light repeatedly shuttles back and forth in the polarizer and is absorbed by the polarizer in large quantity and cannot be emitted, so that the light emitted by the quantum dots is absorbed by the polarizer in large quantity and cannot pass through the Cell, and the light extraction rate of the light emitted by the quantum dots through the polarizer is only about 25%.

Therefore, it is desirable to provide a quantum dot polarizer, a display substrate and a display device to solve the problem of low extraction rate of the quantum dot high-viewing-angle light.

Disclosure of Invention

In order to solve the above problems, the present invention provides a quantum dot polarizer, a display substrate, and a display device, in which a plurality of optical composite layers are disposed between a quantum dot layer and a polarizing layer, so that the extraction rate of quantum dot light with a large viewing angle can be increased.

In order to achieve the purpose, the quantum dot polarizer, the backlight module and the display device adopt the following technical scheme.

The invention provides a quantum dot polarizer, which comprises a quantum dot layer, a polarizing layer and a plurality of optical composite layers positioned between the quantum dot layer and the polarizing layer, wherein: one surface of each optical composite layer facing the polarizing layer is a microstructure surface, the microstructure surface comprises a plurality of optical structures arranged in an array, and the optical structures are used for converging light; and an air layer is arranged between each microstructure surface and the adjacent functional layer, and the functional layer is one of the optical composite layer or the polarizing layer.

Further, the extending direction of the optical structure of each optical composite layer and the included angle of the polarizing axis of the polarizing layer are theta, and the range of the theta is 0-20 ℃; the extending direction of the optical structures of the two adjacent optical composite layers forms an included angle alpha, and the range of the alpha is 10-20 ℃.

Further, a structural gap is formed between the adjacent optical structures on the same microstructure surface; each microstructure surface is attached to the adjacent functional layer: the optical structure is attached to the functional layer, and the structural gap is matched with the functional layer to form an air gap; the air gap constitutes the air layer.

Furthermore, a substrate layer is arranged on one surface of each optical composite layer facing the quantum dot layer, and the substrate layer is used for being attached to the microstructure surface or the quantum dot layer.

Further, the optical structure is a prism-shaped protrusion.

Further, the plurality of optical structures are the same size and are arranged in an array parallel to each other.

Further, the plurality of optical composite layers are a first optical composite layer and a second optical composite layer, wherein: the first optical composite layer is arranged on the quantum dot layer; the second optical composite layer is disposed between the first optical composite layer and the polarizing layer.

The invention provides a display substrate which comprises a substrate and the quantum dot polarizer, wherein the quantum dot polarizer is arranged on one surface of the substrate in a laminated mode.

The invention also provides a display device, which comprises the quantum dot polarizer or the display substrate.

The quantum dot polaroid, the display substrate and the display device have the following beneficial effects:

according to the quantum dot polarizer, the plurality of optical composite layers are additionally arranged, and the microstructure surface of each optical composite layer provides an air layer, so that the thickness of the air layer between a quantum dot layer and a polarizing layer can be increased, and the light receiving effect of the optical composite layers can improve the extraction rate of quantum dot large-viewing-angle light; by limiting the trend of the optical structure of the optical composite layer, the quantum dot polarizer can avoid the occurrence of Moore interference fringes under the condition of ensuring the advantage of the horizontal large viewing angle of the quantum dot polarizer. By adopting the quantum dot polaroid, the display substrate and the display device can improve the extraction rate of large-viewing-angle light rays and improve the display effect.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a quantum dot polarizer according to the present invention.

Fig. 2 is a second structural schematic diagram of the quantum dot polarizer of the present invention.

Fig. 3 is a schematic structural diagram of a display substrate according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Fig. 1 is a first structural diagram of the quantum dot polarizer of the present invention, and fig. 2 is a second structural diagram of the quantum dot polarizer of the present invention. As shown in fig. 1 and 2, the present invention provides a quantum dot polarizer 1, wherein the quantum dot polarizer 1 includes a quantum dot layer 10, a polarizing layer 30 disposed on a surface of the quantum dot layer 10, and a plurality of optical composite layers 20 stacked between the quantum dot layer 10 and the polarizing layer 30.

As shown in fig. 1, a surface of each of the optical composite layers 20 facing the polarizing layer 30 is a micro-structured surface 21, and each of the micro-structured surfaces 21 includes a plurality of optical structures 211 for converging light. Meanwhile, a structural gap 212 is formed between adjacent optical structures 211.

The optical structure 211 can at least converge light, that is, can converge light with a large viewing angle; the structural gap 212 is filled with air, which is a low-refractive layer, so that the light with a large viewing angle emitted from the quantum dot layer 10 is totally reflected at the structural gap 212 and the quantum dot layer 10.

Here, by providing the optical composite layer 20, the thickness of the air layer in the quantum dot polarizer 1 can be increased, and the gathering of the light with a large viewing angle can also be increased, so that the total reflection of the light with a large viewing angle at the interface between the polarizing layer 30 and the Cell is avoided, the total reflection light with a large viewing angle is prevented from being absorbed by the polarizing layer 30, and the light extraction rate is finally improved.

Specifically, the optical structures 211 are prism-shaped protrusions. The optical structures 211, i.e., the prism-shaped protrusions, may have various shapes.

For example, as shown in fig. 1, in the present embodiment, the cross-sectional shape of the optical structure 211 may be a triangle. In other embodiments, the cross-sectional shape of the optical structure 211 may be a polygon such as a triangle or a quadrangle, a cone or a polygonal pyramid, or may have a cone frustum or a polygonal frustum shape. That is, the present invention does not limit the specific shape of the cross section of the optical structure 211, and in practical implementation, the optical structure 211 may select prism-shaped structures with other cross-sectional shapes according to actual design requirements.

Specifically, the plurality of optical structures 211 are identical in shape and size and are arranged in an array in a parallel manner with respect to each other.

As shown in fig. 1, in the present embodiment, the prism-shaped protrusions are arranged in parallel with each other. Meanwhile, the plurality of optical structures 211 are substantially the same in size or shape.

It should be noted that the structure, size, cross-sectional shape, arrangement and configuration of the optical structures 211 are not limited to the above, as long as the specific configuration of the optical structures 211 is suitable for converging light, the three-dimensional shapes of the adjacent optical structures 211 may be different from each other or irregularly repeatedly or randomly arranged, and the optical structures 211 may also be arranged at irregular intervals.

Such an optical structure 211 may be formed by a winding method, a screen printing method, an ink-jet method, or the like. Furthermore, the optical structure 211 may be formed by any means known to those skilled in the art.

As shown in fig. 2, a substrate layer 23 is disposed on a surface of each optical composite layer 20 facing the quantum dot layer 10. In specific implementation, a surface of the substrate layer 23 facing the quantum dot layer 10 is a plane. By providing the base layer 23, control of the bonding effect between the adjacent optical composite layers 20 or between the optical composite layer 20 and the quantum dot layer 10 is facilitated.

In practical implementation, the optical composite layer 20 is preferably formed of a material having excellent light transmittance so as to transmit light. Preferably, the optical composite layer 20 may be polyethylene terephthalate (PET) having excellent thermal stability and high mechanical strength. However, the optical composite layer 20 is not limited thereto, and may be formed of any thin film material known to those skilled in the art.

The structure of the quantum dot polarizer 1 according to the present invention will be described in detail below with reference to fig. 1 and 2. Meanwhile, it should be noted that fig. 1 and fig. 2 are schematic structures of the quantum dot polarizer 1 according to the present invention, respectively.

As shown in fig. 1, the plurality of optical composite layers 20 are stacked between the quantum dot layer 10 and the polarizing layer 30. Here, it is to be noted that the present invention does not specifically limit the number of the optical composite layers 20 included in the quantum dot polarizer 1. That is, when the quantum dot polarizer 1 is designed, the number of the optical composite layers 20 can be changed according to actual requirements.

As shown in fig. 1 and 2, in the present embodiment, the quantum dot polarizer 1 includes a first optical composite layer 20A and a second optical composite layer 20B, wherein the first optical composite layer 20A is stacked on the quantum dot layer 10, and the second optical composite layer 20B is stacked between the first optical composite layer 20A and the polarizing layer 30.

As shown in fig. 1, an air layer 22 is provided between the microstructure surface 21 of each optical composite layer 20 and a functional layer adjacent to the microstructure surface, wherein the functional layer is one of the optical composite layer 20 or the polarizing layer 30. Alternatively, an air layer 22 is formed between the microstructure surface 21 of the lower optical composite layer 20 and the upper optical composite layer 20 or the polarizer 30.

That is, an optical composite layer 20 is added, and the microstructure surface 21 of the optical composite layer 20 provides an air layer 22 by the cooperation of the adjacent film layers, so as to increase the air thickness between the quantum dot layer 10 and the polarizing layer 30.

As shown in fig. 1, the air layer 22 can be formed by bonding the microstructure surface 21 and a functional layer adjacent thereto. In the same microstructure surface 21, a structural gap 212 is formed between adjacent optical structures 211.

When a microstructure surface 21 is bonded to an adjacent functional layer, the optical structure 211 in the microstructure surface 21 is bonded to the functional layer, and the structure gap 212 of the microstructure surface 21 cooperates with the functional layer to form an air gap 221. A plurality of air gaps 221 are provided to constitute the air layer 22.

As shown in fig. 1, the optical composite layer 20 is provided with a base layer 23 on a surface facing the quantum dot layer 10, and an air layer 22 is defined between the microstructure surface 21 of each optical composite layer 20 and the base layer 23 or the polarizing layer 30 adjacent thereto by adhesion. The air layer 22 may be located between the microstructure surface 21 and the base layer 23 or the polarizing layer 30 adjacent to the microstructure surface 21.

In practical implementation, the optical structures 211 of the optical composite layer 20 below and the lower surface of the upper substrate layer 23 or the lower surface of the polarizing layer 30 may be integrated with each other by using an adhesive.

For example, as shown in fig. 1, in the present embodiment, the base layer 23 of the first optical composite layer 20A is bonded to the quantum dot layer 10 located therebelow, and the optical structure 211 of the first optical composite layer 20A is bonded to the base layer 23 of the second optical composite layer 20B. At the same time, an air gap 221 filled with air is formed between the structural gap 212 of the first optical composite layer 20A and the base layer 23 of the second optical composite layer 20B. The optical structure 211 of the second optical composite layer 20B is attached to the lower surface of the polarizing layer 30, and an air gap 221 filled with air is formed between the structural gap 212 of the second optical composite layer 20B and the lower surface of the polarizer 30. It can be seen that the microstructured surfaces 21 of the first optical composite layer 20A and the second optical composite layer 20B each provide an air layer 22.

As shown in fig. 2, in order to ensure the advantage of a horizontally large viewing angle of the quantum dot polarizer 1 and prevent the generation of moire fringes, the plurality of optical composite layers 20 are defined as follows: the included angle of the extending directions of the optical structures 211 of the two adjacent optical composite layers 20 is alpha, and then the range of the alpha is 10-20 ℃; the extending direction of the optical structure 211 of each optical composite layer 20 forms an angle θ with the polarizing axis X of the polarizing layer 30, and θ ranges from 0 ℃ to 20 ℃.

For example, as shown in fig. 2, in this embodiment, when the included angle between the extending direction X1 of the optical structure 211 of the first optical composite layer 20A and the polarizing axis X of the polarizing layer 30 is θ 1, and the included angle between the extending direction X2 of the optical structure 211 of the second optical composite layer 20B and the polarizing axis X of the polarizing layer 30 is θ 2, the ranges of θ 1 and θ 2 are 0 ℃ to 20 ℃. Meanwhile, the extending direction X1 of the optical structure 211 of the first optical composite layer 20A and the extending direction X2 of the optical structure 211 of the second optical composite layer 20B form an included angle α in the range of 10 ℃ to 20 ℃.

It should be noted that the extending direction of the optical structure 211 of the optical composite layer 20 refers to the extending direction of the optical structure 211 in the plane of the optical composite layer 20, and does not refer to the extending direction of the optical structure 211 toward the quantum dot layer 30.

In particular, the quantum dot layer 10 includes quantum dots or quantum rods. For example, the material forming the quantum dots or quantum rods may be formed of a group II-VI, III-V, IV-VI, or IV semiconductor substance or a compound thereof on the periodic table, or any semiconductor substance or compound known to those skilled in the art may be used.

Specifically, the polarizing layer 30 may be made of any material that can be used to form a polarizing layer or a polarizer.

Fig. 3 is a schematic structural diagram of a display substrate according to the present invention. As shown in fig. 3, the present invention provides a display substrate, which includes a substrate 2 and a quantum dot polarizer 1 stacked on one surface of the substrate 2.

Specifically, the quantum dot polarizer 1 is the quantum dot polarizer 1 of the present invention, and for a specific structure, reference is made to the above, which is not described herein again.

Specifically, the substrate 2 is a TFT substrate or a color filter substrate.

The invention also provides a display panel, and the display panel adopts the display substrate. The display panel can improve the extraction rate of light rays with large visual angles and improve the display effect.

The invention also provides a display device which comprises the display substrate or the quantum dot polarization light 1. The display device can improve the extraction rate of light with large visual angle and improve the display effect.

According to the quantum dot polarizer 1, the multiple optical composite layers 20 are additionally arranged, and the microstructure surface 21 of each optical composite layer 20 provides an air layer 22, so that the thickness of the air layer between the quantum dot layer 10 and the polarizing layer 30 can be increased, and meanwhile, the light receiving effect of the optical composite layers 20 can finally improve the extraction rate of quantum dot large-viewing-angle light; by limiting the direction of the optical structure 211 of the optical composite layer 20, the quantum dot polarizer of the present invention can also avoid the occurrence of moire fringes while ensuring the advantage of horizontal large viewing angle. By adopting the quantum dot polaroid 1, the display panel and the display device can improve the extraction rate of large-viewing-angle light rays and improve the display effect.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The foregoing describes in detail a quantum dot polarizer, a display substrate, and a display device provided in the embodiments of the present application, and the principles and embodiments of the present application are described herein by applying specific examples, and the description of the foregoing embodiments is only used to help understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.