CN105137648A - COA substrate and preparation method thereof as well as display device - Google Patents

Abstract

The invention provides a COA substrate, a preparation method thereof, and a display device, which belong to the field of display technology and can solve the problem of a relatively thick display device in the prior art. The COA substrate of the present invention includes an array substrate and a color filter layer disposed on the light-emitting surface side of the array substrate, the color filter layer includes filters of different colors, and the filters are formed of quantum dot materials; The quantum dots have an orientation for converting natural light into polarized light. Since the filter in the color filter layer of the COA substrate of the present invention is made of quantum dot material, and the quantum dot has an orientation, it can convert natural light into polarized light, so the COA substrate is applied to the display panel, at this time The lower polarizing plate is not needed, so that the thickness of the display panel is reduced, thereby realizing the lightness and thinning of the display device.

Description

COA substrate, preparation method thereof, and display device

technical field

The invention belongs to the field of display technology, and in particular relates to a COA substrate, a preparation method thereof, and a display device.

Background technique

Quantum Dot (QuantumDot) is a semiconductor nanostructure that binds conduction band electrons, valence band holes, and excitons in three spatial directions. This constraint can be attributed to electrostatic potential (by external electrodes, doping, strain , impurity generation), the interface of two different semiconductor materials (for example: in self-assembled quantum dots), the surface of a semiconductor (for example: semiconductor nanocrystals), or a combination of the above three. Quantum dots have separate quantized energy spectra, corresponding to wave functions that are spatially located in the quantum dot, but extend over several lattice periods. A quantum dot has an integer number (1-100) of electrons, holes or hole-electron pairs, that is, the electric charge it carries is an integer multiple of the elementary charge.

Quantum dots, also known as nanocrystals, are nanoparticles composed of II-VI or III-V elements. The particle size of quantum dots is generally between 1 and 10 nm. Since electrons and holes are quantum-confined, the continuous energy band structure becomes a discrete energy level structure with molecular characteristics, and can emit fluorescence after being excited. Based on quantum effects, quantum dots have broad application prospects in solar cells, light-emitting devices, optical biomarkers and other fields. There are many different methods to manufacture quantum dots in the prior art, and display products of quantum dots have been developed.

The inventors have found at least the following problems in the prior art: when quantum dots are applied to display products, only how to excite the quantum dots to emit light of different colors is considered, but the polarization characteristics of the quantum dots of the quantum dots are not considered, so In the present invention, a quantum dot structure with polarization properties is proposed.

Contents of the invention

The technical problem to be solved by the present invention includes, aiming at the above-mentioned problems existing in the existing display products, to provide a COA substrate capable of realizing light and thin, its preparation method, and a display device.

The technical solution adopted to solve the technical problem of the present invention is a COA substrate, including an array substrate and a color filter layer arranged on the light-emitting surface side of the array substrate, and the color filter layer includes filters of different colors. The optical filter is formed of a quantum dot material; the quantum dot has an orientation for converting natural light into polarized light.

Preferably, the COA substrate includes a display area and an encapsulation area surrounding the display area, and a light-shielding structure is arranged in the encapsulation area, and the light-shielding structure is a laminated structure, and each layer structure is related to a color of The optical filters are arranged in the same layer and made of the same material, and the number of layers is the same as the color type of the optical filters.

Preferably, the filters of different colors are: red filters, green filters, blue filters; or,

The filters of different colors are: red filter, green filter, blue filter, yellow filter; or,

The optical filters of different colors are: red optical filter, green optical filter, blue optical filter, white optical filter.

Preferably, the material of the quantum dot is zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium selenide, cadmium telluride, gallium arsenide, indium phosphide, telluride at least one of lead.

Preferably, the color filter layer further includes a black matrix, and the black matrix is arranged between any two adjacent filters.

The technical solution adopted to solve the technical problem of the present invention is a method for preparing a COA substrate, including the steps of forming an array substrate and forming the color filter layer on the light-emitting surface side of the array substrate; The steps of filming include;

Optical filters of different colors are sequentially formed on the light emitting surface side of the array substrate, wherein the material of the optical filters is quantum dots; the quantum dots have orientation and are used to convert natural light into polarized light.

Preferably, the filters forming different colors include:

The quantum dots are formed on the light emitting surface side of the array substrate by using a self-assembly process.

Preferably, the COA substrate includes a display area and an encapsulation area surrounding the display area, and when forming the filters of different colors, it also includes:

The step of forming a light-shielding structure in the packaging area, the light-shielding structure is a laminated structure, each layer structure is formed synchronously with a color filter, and the number of layers is the same as the color of the filter.

Preferably, the filters of different colors are: red filters, green filters, blue filters; or,

The filters of different colors are: red filter, green filter, blue filter, yellow filter; or,

The optical filters of different colors are: red optical filter, green optical filter, blue optical filter, white optical filter.

The technical solution adopted to solve the technical problem of the present invention is a display device, which includes the above-mentioned COA substrate.

The present invention has following beneficial effects:

Since the filter in the color filter layer of the COA substrate of the present invention is made of quantum dot material, and the quantum dot has an orientation, it can convert natural light into polarized light, so the COA substrate is applied to the display panel, at this time The lower polarizer (the polarizer on the side close to the backlight source) is unnecessary, so that the thickness of the display panel is reduced, thereby realizing the lightness and thinning of the display device.

Description of drawings

Fig. 1 is the structural representation of the COA substrate of embodiment 1 of the present invention;

Fig. 2 is a kind of schematic diagram of the color filter layer on the structure of the COA substrate of embodiment 1 of the present invention;

Fig. 3 is another schematic diagram of the color filter layer on the structure of the COA substrate of Embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of a display device according to Embodiment 3 of the present invention.

The reference signs are: 10, array substrate; 20, color filter layer; 21/22/23, filter; 24, black matrix; 30, light-shielding structure; 40, box-aligning substrate; 50, upper polarizer.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1:

As shown in FIG. 1 , this embodiment provides a COA substrate, including an array substrate 10 and a color filter layer 20 disposed on the light-emitting surface side of the array substrate 10, and the color filter layer 20 includes different color filter layers. Sheets 21/22/23, the optical filters 21/22/23 are formed of quantum dot material; the quantum dots have orientation and are used to convert natural light into polarized light.

Since the filters 21/22/23 in the color filter layer 20 of the COA substrate in this embodiment are made of quantum dot materials, and the quantum dots have an orientation and can convert natural light into polarized light, the COA substrate is applied In the display panel, the lower polarizer (the polarizer on the side close to the backlight source) is not needed at this time, so that the thickness of the display panel is reduced, thereby realizing the thinning of the display device.

Wherein, the COA substrate includes a display area and an encapsulation area surrounding the display area, and a light-shielding structure 30 is arranged in the encapsulation area. The sheets are arranged in the same layer and made of the same material, and the number of layers is the same as the color type of the optical filter.

Specifically, the COA substrate includes three filters of different colors, that is, the red filter R, the green filter G, and the blue filter B as an example, and those skilled in the art can understand that the three Filters of different colors are arranged in the display area for realizing color display. The encapsulation area of the COA substrate is also the non-display area. In order to achieve a better display effect, a light-shielding structure 30 needs to be provided in the encapsulation area to prevent light leakage from the display panel. In this embodiment, each layer structure in the light-shielding structure 30 is set in the same layer and made of the same material as a color filter, and the number of layers is the same as the color type of the filter. That is to say, the first layer structure of the light shielding structure 30 is formed while the red filter R is formed, the second layer structure of the light shielding structure 30 is formed while the green filter G is formed, and the blue filter B is formed simultaneously. The third layer structure of the light-shielding structure 30 is finally formed at the same time as the light-shielding structure 30 and the color filter layer 20, which not only does not increase the process steps, but also saves costs.

As shown in conjunction with FIGS. 2 and 3 , the color filter layer 20 of this embodiment may include filters of three different colors, or may include filters of four different colors.

Specifically, the filters of different colors are: red filter R, green filter G, blue filter B; or, the filters of different colors are: red filter R, Green filter G, blue filter B/yellow filter; or, the filters of different colors are: red filter R, green filter G, blue filter B, white filter. Certainly, the color of the filter 4 of the fourth color other than the red filter R, the green filter G, and the blue filter B can also be wine red, orange and other colors.

Wherein, the quantum dot material of the optical filter 21/22/23 in this embodiment can be zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium selenide , at least one of cadmium telluride, gallium arsenide, indium phosphide, and lead telluride. Of course, it can also be set according to the specific situation.

Wherein, the color filter layer 20 in this embodiment also includes a black matrix 24, and the black matrix 24 is arranged between any two adjacent filters 21/22/23 to prevent any two adjacent Light leaks between the filters 21/22/23.

The color filter layer 20 in the COA substrate provided in this embodiment is not only an important part of the color display, but also serves as a lower polarizer, so that the thickness of the display panel is reduced, and the display device is thinner.

Example 2:

This embodiment provides a method for preparing a COA substrate, and the COA substrate may be the COA substrate in Embodiment 1. The method specifically includes the following steps:

Steps of forming the array substrate 10 and forming the color filter layer 20 on the light emitting surface side of the array substrate 10 . Wherein, the steps of forming the color filter 21/22/23 include;

Optical filters 21/22/23 of different colors are sequentially formed on the light-emitting surface side of the array substrate 10, wherein the material of the optical filters 21/22/23 is quantum dots; the quantum dots have an orientation, and for converting natural light into polarized light.

Wherein, the described optical filters of different colors are: red optical filter R, green optical filter G, blue optical filter B; Or, the described optical filters of different colors are: red optical filter R, green optical filter Filter G, blue filter B/yellow filter; or, the filters of different colors are: red filter R, green filter G, blue filter B, white filter light sheet. Certainly, the color of the filter 4 of the fourth color other than the red filter R, the green filter G, and the blue filter B can also be wine red, orange and other colors.

Wherein, the quantum dot material of the optical filter 21/22/23 in this embodiment can be zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium selenide , at least one of cadmium telluride, gallium arsenide, indium phosphide, and lead telluride. Of course, it can also be set according to the specific situation.

Specifically, the step of forming quantum dots with orientation is to form the quantum dots on the light emitting surface side of the array substrate 10 by using a self-assembly process.

The COA substrate includes a display area and an encapsulation area surrounding the display area. When forming the optical filters 21/22/23 of different colors, it also includes a step of forming a light-shielding structure 30 in the encapsulation area. The light-shielding The structure 30 is a laminated structure, each layer of structure is formed synchronously with a color filter, and the number of layers is the same as the color of the filter.

Specifically, taking the COA substrate including three filters of different colors, that is, red filter R, green filter G, and blue filter B as an example, the light-shielding structure is formed while the red filter R is formed. 30, the green filter G is formed while the second layer structure of the light-shielding structure 30 is formed, the blue filter B is formed while the third layer structure of the light-shielding structure 30 is formed, and finally the light-shielding structure 30 and The color filter layer 20 is formed at the same time, which not only does not increase process steps, but also saves cost.

Example 3:

As shown in FIG. 4 , this embodiment provides a display device, which includes the COA substrate of Embodiment 1, and also includes a box-facing substrate 40 opposite to the COA substrate. Polarizer 50, and because the quantum dots in the color filter layer 20 in the COA substrate have orientation, can, can convert natural light into polarized light, therefore can omit the setting of lower polarizer, so the display device of this embodiment has realized frivolous change.

The display device may be any product or component with a display function such as a liquid crystal display panel, electronic paper, mobile phone, tablet computer, television, monitor, notebook computer, digital photo frame, navigator, and the like.

It can be understood that, the above embodiments are only exemplary embodiments adopted for illustrating the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (10)

1. A COA substrate comprises an array substrate and a color filter layer arranged on the light emergent surface side of the array substrate, and is characterized in that the color filter layer comprises filters with different colors, and the filters are made of quantum dot materials; the quantum dots have an orientation for converting natural light into polarized light.

2. The COA substrate of claim 1, wherein the COA substrate comprises a display area and an encapsulation area surrounding the display area, a light shielding structure is disposed in the encapsulation area, the light shielding structure is a stacked structure, each layer of the light shielding structure is disposed on the same layer as the color filter of one color and is made of the same material, and the number of the layers is the same as the color type of the color filter.

3. The COA substrate of claim 1, wherein the filters of different colors are: a red filter, a green filter and a blue filter; or,

the filters of different colors are: a red filter, a green filter, a blue filter and a yellow filter; or,

the filters of different colors are: red filter, green filter, blue filter, white filter.

4. The COA substrate of claim 1, wherein the material of the quantum dots is at least one of zinc sulfide, zinc oxide, gallium nitride, zinc selenide, cadmium sulfide, gallium selenide, cadmium telluride, gallium arsenide, indium phosphide, lead telluride.

5. The COA substrate of claim 1, wherein the color filter layer further comprises a black matrix disposed between any two adjacent filters.

6. A preparation method of a COA substrate comprises the steps of forming an array substrate and forming a color filter layer on the light emergent surface side of the array substrate, and is characterized in that the step of forming the color filter comprises the following steps;

sequentially forming optical filters with different colors on the light emergent surface side of the array substrate, wherein the optical filters are made of quantum dots; the quantum dots have an orientation for converting natural light into polarized light.

7. The method of claim 6, wherein the forming the color filters of different colors comprises:

and forming the quantum dots on the light emergent surface side of the array substrate by adopting a self-assembly process.

8. The method of claim 6, wherein the COA substrate comprises a display region and an encapsulation region surrounding the display region, and the method further comprises the steps of forming the filters of different colors:

and forming a light shielding structure in the packaging area, wherein the light shielding structure is a laminated structure, each layer of structure is formed synchronously with the optical filter of one color, and the number of layers is the same as the color type of the optical filter.

9. The method of claim 6, wherein the color filters of different colors are: a red filter, a green filter and a blue filter; or,

the filters of different colors are: a red filter, a green filter, a blue filter and a yellow filter; or,

the filters of different colors are: red filter, green filter, blue filter, white filter.

10. A display device comprising the COA substrate of any one of claims 1 to 5.