CN105929590B

CN105929590B - Display substrate and display device

Info

Publication number: CN105929590B
Application number: CN201610537554.4A
Authority: CN
Inventors: 石戈; 田允允; 崔贤植; 林允植; 方正; 祝明
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2016-07-08
Filing date: 2016-07-08
Publication date: 2022-09-27
Anticipated expiration: 2036-07-08
Also published as: CN105929590A

Abstract

The invention provides a display substrate and a display device, belongs to the technical field of quantum dot display, and can at least partially solve the problem that the existing display device adopting quantum dots as a color filter film is easy to cause color mixing. The display substrate is used in a display device and comprises a substrate, wherein one side of the substrate is provided with a plurality of color filter coatings with different colors, each color filter coating contains quantum dots capable of emitting light with corresponding color, at least part of the periphery of each color filter coating is provided with a lighttight retaining wall, the retaining wall is provided with a first surface facing the light-emitting surface of the display device, the color filter coatings are provided with a second surface facing the light-emitting surface of the display device, and the first surface is closer to the light-emitting surface of the display device than the second surface.

Description

Display substrate and display device

Technical Field

The invention belongs to the technical field of quantum dot display, and particularly relates to a display substrate and a display device.

Background

Quantum Dots (QDs) refer to particulate materials with three-dimensional dimensions all on the order of nanometers, and have many specific properties due to their specific dimensions. For example, a quantum dot may enter an excited state when illuminated with light and emit light of a particular wavelength (i.e., a particular color) when falling back from the excited state to the ground state.

Due to the above properties of quantum dots, they have been widely used in display devices. For example, as shown in fig. 1, a display device includes a backlight 6 and a liquid crystal display panel 4, the liquid crystal display panel 4 includes an array substrate 1 and a color filter substrate 21, a liquid crystal layer is disposed between the two substrates, and a Wire Grid Polarizer (WGP)31 and an upper polarizer 32 are disposed outside the two substrates, respectively. A Short wave Pass Reflection (SPR) substrate 5 is further disposed between the liquid crystal display panel 4 and the backlight 6, the Short wave Pass Reflection substrate 5 allows light of a shorter wavelength to Pass therethrough and reflects light of a longer wavelength, and the wire grid polarizer 31 includes a periodically arranged metal wire grid which reflects a light component having an electric field vector parallel to the wire grid and allows a light component having an electric field vector perpendicular to the wire grid to Pass therethrough, whereby the Short wave Pass Reflection substrate 5 and the wire grid polarizer 31 can collectively function to change the transmitted light into linearly polarized light of a specific wavelength. The color filter films 71 are disposed in the red sub-pixel and the green sub-pixel of the color filter substrate 21, a black matrix 79 may be disposed between the adjacent color filter films 71, and the color filter films 71 of each color respectively include quantum dots emitting light of a corresponding color, so that the light transmitted by the red sub-pixel and the green sub-pixel is changed into a corresponding color. The wavelength of light emitted by the quantum dots can only be greater than or equal to the wavelength of the excitation light, so the backlight source 6 needs to emit blue light to enable the quantum dots to emit red light and green light (the wavelength of the blue light is shorter than the wavelengths of the red light and the green light), and meanwhile, the backlight source 6 emits blue light, so a color filter film does not need to be arranged in the blue sub-pixel.

It can be seen that in the display device using quantum dots as color filter, at least some of the color filters of the sub-pixels actually emit light by themselves, and the light emission direction of the color filters is not specific. Therefore, light emitted by the color filter of one color sub-pixel easily enters the area of other sub-pixels, thereby causing color mixing and affecting the display effect.

Disclosure of Invention

The invention at least partially solves the problem that the existing display device adopting quantum dots as a color filter film is easy to cause color mixing, and provides a display substrate and a display device capable of avoiding color mixing.

The technical scheme adopted for solving the technical problem is that the display substrate is used in a display device and comprises a substrate, wherein one side of the substrate is provided with a plurality of color filter coatings with different colors, each color filter coating comprises quantum dots capable of emitting light with corresponding colors, and each color filter coating comprises quantum dots capable of emitting light with corresponding colors

Each at least partial position of color filter coating periphery is equipped with lighttight barricade, the barricade has the first face towards display device light-emitting surface, color filter coating has the second face towards display device light-emitting surface, first face is closer to display device light-emitting surface than the second face.

Preferably, the retaining wall and the color filter film are arranged on one side of the substrate away from the light-emitting surface of the display device; the color filter film is characterized in that a transparent spacer layer is further arranged between the color filter film and the substrate, no spacer layer is arranged between the retaining wall and the substrate, and the surface of the retaining wall close to the substrate is flush with the surface of the spacer layer close to the substrate.

Preferably, the retaining wall and the color filter film are arranged on one side of the substrate close to the light-emitting surface of the display device; the height of the retaining wall is greater than the thickness of the color filter film, and the surface of the retaining wall close to the substrate is flush with the surface of the color filter film close to the substrate.

Preferably, the height of the retaining wall is 2-2.5 times of the thickness of the color filter film.

Preferably, the display substrate is a display substrate provided between the liquid crystal display panel and the backlight.

Further preferably, the display substrate is a short-wave pass reflective substrate.

Preferably, the retaining wall is made of a light-reflecting metal.

Preferably, the retaining wall is formed of a black photoresist.

Preferably, the display substrate includes a plurality of sub-pixels with different colors, at least some of the sub-pixels have color filters with corresponding colors, and the barriers surround the color filters in each sub-pixel.

The technical scheme adopted for solving the technical problem of the invention is a display device, which comprises:

the display substrate described above;

a backlight source.

The display substrate comprises the retaining wall surrounding the color filter film, and the first surface of the retaining wall is closer to the light-emitting surface of the display device than the second surface of the color filter film, so that when quantum dots in the color filter film are excited to emit light, the emitted light with large angles which is emitted to other sub-pixels can be blocked by the retaining wall, the light-emitting angle of the color filter film is limited, and the emitted light can not enter or only enters a small amount of light into the regions of the sub-pixels with other colors, so that the color mixing problem is avoided.

Drawings

Fig. 1 is a schematic partial cross-sectional view of a conventional display device;

FIG. 2 is a schematic partial cross-sectional view of a display device according to an embodiment of the invention;

FIG. 3 is a schematic partial cross-sectional view of another display device according to an embodiment of the invention;

wherein the reference numerals are: 1. an array substrate; 21. a color film substrate; 22. a box aligning substrate; 31. a wire grid type polarizing plate; 32. an upper polarizing plate; 4. a liquid crystal display panel; 5. short wave passes through the reflecting base; 6. a backlight source; 71. a color filter film; 72. retaining walls; 73. a spacer layer; 79. a black matrix; 81. a first side; 82. a second face; 9. a substrate.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example 1:

as shown in fig. 2 and 3, the present embodiment provides a display substrate, which is used in a display device and includes a substrate 9, a plurality of color filters 71 with different colors are disposed on one side of the substrate 9, each color filter 71 includes a quantum dot capable of emitting light with a corresponding color, and each color filter 71 includes a quantum dot

At least a portion of the periphery of each color filter 71 is provided with a light-impermeable wall 72, the wall 72 has a first surface 81 facing the light-emitting surface of the display device, the color filter 71 has a second surface 82 facing the light-emitting surface of the display device, and the first surface 81 is closer to the light-emitting surface of the display device than the second surface 82.

The display substrate of the present embodiment is used in a display device, and includes a color filter 71 containing quantum dots, and a light-tight wall 72 is disposed around the color filter 71. Obviously, the wall 72 and the color filter 71 have surfaces facing the light-emitting surface of the display device, i.e. the first surface 81 and the second surface 82, and regardless of which side of the substrate 9 the wall 72 and the color filter 71 are disposed on, the first surface 81 of the wall 72 should be closer to the light-emitting surface of the display device than the second surface 82 of the color filter 71.

The display substrate of the embodiment includes the retaining wall 72 surrounding the color filter film 71, and the first surface 81 of the retaining wall 72 is closer to the light exit surface of the display device than the second surface 82 of the color filter film 71, so when the quantum dots in the color filter film 71 are excited to emit light, the emitted light with large angles toward other sub-pixels is blocked by the retaining wall 72, and thus the light emitting angle of the color filter film 71 is limited, and the emitted light does not enter or only enters a small amount of light into the sub-pixel regions with other colors, thereby avoiding the color mixing problem.

Preferably, the retaining wall 72 is formed of a light-reflecting metal as a means of this embodiment.

That is, the retaining wall 72 is preferably made of a light-reflecting metal material such as aluminum. Therefore, after the light hitting the wall 72 is reflected, the light may still be emitted from the sub-pixel at a small angle, thereby improving the utilization rate of the light energy.

Preferably, as another mode of the present embodiment, the retaining wall 72 is made of a black photoresist material.

That is, the wall 72 may be made of the same black photoresist material as the black matrix, so that light incident thereon is absorbed, thereby achieving the most reliable effect of preventing color mixing.

Preferably, the display substrate includes a plurality of sub-pixels with different colors, at least some of the sub-pixels have color filters 71 with corresponding colors, and the barriers 72 surround the color filters 71 in each sub-pixel.

That is, the color filters 71 in the sub-pixels may be independent, and the above-mentioned wall 72 is preferably disposed completely around the color filters 71 in each sub-pixel, so that the wall 72 forms a grid-like pattern as a whole, and the color filters 7 of each sub-pixel are surrounded in a "grid", thereby avoiding color mixing in any direction.

Of course, the specific form of the above sub-pixels and the color filter 71 may be various. For example, if the backlight 6 is used to emit blue light, the red sub-pixel and the green sub-pixel may be respectively provided with color filters 71 of corresponding colors, and the blue sub-pixel may be provided with no color filter.

Preferably, the display substrate is a display substrate provided between the liquid crystal display panel 4 and the backlight 6; more preferably, the display substrate is a Short-wavelength transmission Reflection (SPR) substrate 5.

That is, the above display substrate is preferably disposed between the liquid crystal display panel 4 and the backlight 6, and more specifically, it may be a short-wavelength passing reflective substrate 5. The short-wavelength light-transmitting reflection substrate 5 is a conventional structure of a display device using a color filter film 71 made of quantum dots, and functions to convert transmitted light into linearly polarized light of a specific wavelength in cooperation with a Wire Grid Polarizer (WGP)31 on the outer side (the side away from the counter substrate 22) of the array substrate 1.

This is preferable because the direction of light emitted from the color filter 71 can be defined as early as possible, thereby avoiding color mixing and not significantly adversely affecting the viewing angle range of the display device.

Meanwhile, the conventional short-wave pass reflective substrate 5 generally does not include other structures, so that it is easier to dispose the retaining wall 72 and the color filter 71 on the substrate 9. On the other hand, it is difficult to provide the bank 72 and the color filter 71 in each substrate of the liquid crystal display panel 4, for example, the wire grid polarizer 31 is attached to the outer side of the array substrate 1, and the driving circuit is included in the inner side, and the bank 72 and the color filter 71 may adversely affect the original structure.

Preferably, as a mode of the present embodiment, the retaining wall 72 and the color filter 71 are disposed on a side of the substrate 9 close to the light-emitting surface of the display device; the height of the retaining wall 72 is greater than the thickness of the color filter film 71, and the surface of the retaining wall 72 close to the substrate 9 is flush with the surface of the spacer layer 71 close to the substrate 9.

Obviously, the substrate 9 of the display substrate has two sides, one side is close to the light emitting surface of the display device, and the other side is far away from the light emitting surface of the display device. As shown in fig. 2, when the retaining wall 72 and the color filter 71 are disposed on a side (upper side in the figure) of the substrate 9 close to the light-emitting surface of the display device, in this case, under the condition that the retaining wall 72 is flush with the bottom surface (i.e. the surface close to the substrate 9) of the color filter 71, if the height of the retaining wall 72 is greater than the height of the color filter 71, it can be ensured that the first surface 81 (top surface) of the retaining wall 72 is closer to the light-emitting surface of the display device than the second surface 82 (top surface) of the color filter 71.

Of course, although the retaining wall 72 and the color filter 71 are located in the short wave passing reflective substrate 5 in FIG. 2, it is also possible to locate the retaining wall 72 and the color filter 71 in other substrates.

More preferably, the height of the retaining wall 72 is 2 to 2.5 times the thickness of the color filter 71.

That is, the height of the dam 72 and the thickness of the color filter 71 should satisfy the above relationship, so that the dam 72 is more suitable to be beyond the range of the color filter 71, which can not only play a role of preventing the color mixing, but also be easier to realize.

Preferably, as another mode of this embodiment, the retaining wall 72 and the color filter 71 are disposed on a side of the substrate 9 away from the light-emitting surface of the display device; a transparent spacer 73 is further disposed between the color filter 71 and the substrate 9, the barrier wall 72 and the substrate 9 are not provided with the spacer 73, and a surface of the barrier wall 72 close to the substrate 9 is flush with a surface of the spacer 73 close to the substrate 9.

That is, the dam 72 and the color filter 71 can also be disposed on a side (lower side) of the substrate 9 away from the light-emitting surface of the display device. At this time, since the first surface 81 and the second surface 82 are the bottom surfaces of the retaining wall 72 and the color filter 71, respectively, the height of the retaining wall 72 is increased, so that the positional relationship between the first surface 81 and the second surface 82 cannot meet the above requirements. Therefore, as shown in fig. 3, the color filter 71 can be disposed on the transparent spacer 73, the retaining wall 72 is disposed at a position without the spacer, and the surface (first surface 71, bottom surface) of the retaining wall 72 close to the substrate is flush with the surface (bottom surface) of the spacer 73 close to the substrate, thereby increasing the distance between the bottom surface (second surface 72) of the color filter 71 and the substrate 9, so that the first surface 81 of the retaining wall 72 is closer to the light-emitting surface of the display device than the second surface 82 of the color filter 71.

Of course, although the retaining wall 72 and the color filter 71 are located on the opposite-to-box substrate 22 (in this case, the substrate has the color filter 71, and thus may be referred to as a color filter substrate) in fig. 3, it is also possible to provide the retaining wall 72 and the color filter 71 on other substrates.

Example 2:

as shown in fig. 2 and 3, the present embodiment provides a display device, which includes:

the display substrate described above;

a backlight 6 (preferably a blue light emitting backlight 6).

The above display substrate may be used in a display device, thereby serving to prevent color mixing. Specifically, the display substrate may be used as the array substrate 1 in the liquid crystal display panel 4 or the opposite-box substrate 22 (which may be a color filter substrate) opposite to the array substrate 1, or may be used as the short-wave transmitting reflective substrate 5 disposed between the liquid crystal display panel 4 and the backlight 6.

Of course, other structures such as the upper polarizer 32, power supply, driving chip, frame, etc. may be included in the display device, and will not be described in detail herein.

Specifically, the display device can be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.

It will be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A display substrate is used in a display device, the display substrate comprises a base, one side of the base is provided with a plurality of color filter coatings with different colors, the color filter coating of each color contains quantum dots which can emit light with corresponding color,

at least part of the periphery of each color filter film is provided with a lightproof retaining wall, the retaining wall is provided with a first surface facing the light-emitting surface of the display device, the color filter film is provided with a second surface facing the light-emitting surface of the display device, and the first surface is closer to the light-emitting surface of the display device than the second surface;

the retaining wall and the color filter film are arranged on one side of the substrate close to the light-emitting surface of the display device;

the height of the retaining wall is greater than the thickness of the color filter film, and the surface of the retaining wall close to the substrate is flush with the surface of the color filter film close to the substrate;

the display substrate is used for being arranged between the liquid crystal display panel and the backlight source.

2. The display substrate of claim 1,

the height of the retaining wall is 2-2.5 times of the thickness of the color filter film.

3. The display substrate of claim 1,

the display substrate is a short wave transmission reflection substrate.

4. The display substrate of claim 1,

the retaining wall is made of reflective metal.

5. The display substrate of claim 1,

the retaining wall is made of black photoresist material.

6. The display substrate of claim 1,

the display substrate comprises a plurality of sub-pixels with different colors, at least part of the sub-pixels are provided with color filter films with corresponding colors, and the retaining wall surrounds the color filter films in each sub-pixel.

7. A display device, comprising:

the display substrate of any one of claims 1 to 6;

a backlight source.