CN210639385U

CN210639385U - Quantum dot color film and display device

Info

Publication number: CN210639385U
Application number: CN201921351880.1U
Authority: CN
Inventors: 徐晓波; 马卜; 邢泽咏; 王允军
Original assignee: Suzhou Xingshuo Nanotech Co Ltd
Current assignee: Suzhou Xingshuo Nanotech Co Ltd
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2020-05-29
Anticipated expiration: 2029-08-20

Abstract

The application discloses a quantum dot color film and a display device. The quantum dot color film comprises: a transparent substrate; a light-shielding matrix disposed on the transparent substrate, the light-shielding matrix having a plurality of pixel openings, at least a portion of the pixel openings containing a quantum dot polymer layer therein; in the thickness direction, the light-shielding matrix includes at least two layers: a light absorbing layer in contact with the transparent substrate, and a light reflecting layer laminated on the light absorbing layer. By adopting the shading matrix consisting of the reflecting layer and the light absorbing layer, the absorption of the black matrix to the emitted light of the quantum dot polymer layer in the prior art can be reduced, so that the light conversion efficiency of the quantum dot color film is increased, and meanwhile, the mutual interference of colors in different pixel openings can be effectively avoided.

Description

Quantum dot color film and display device

Technical Field

The application relates to the field of display, in particular to a quantum dot color film and a display device.

Background

The quantum dots have the advantages of narrow half-peak width, adjustable emission peak position and the like, and are widely used in display devices. For example, a quantum dot polymer material is generally used as a light conversion material for a color filter by filling an opening of a black matrix, and a display device based on the quantum dot color filter has a higher display color gamut than a conventional filter material.

However, since the contact surface of the quantum dot polymer layer with the side surface of the black matrix opening is large, a large part of light emitted by the quantum dot polymer layer is absorbed by the black matrix, and thus the light conversion efficiency of the quantum dot color film is low.

SUMMERY OF THE UTILITY MODEL

An object of the present application is to provide a quantum dot color film and a display device, so as to solve the problem that the light conversion efficiency of the quantum dot color film is low.

According to an aspect of the present application, there is provided a quantum dot color film, including: a transparent substrate; a light-shielding matrix disposed on the transparent substrate, the light-shielding matrix having a plurality of pixel openings, at least a portion of the pixel openings containing a quantum dot polymer layer therein; in the thickness direction, the light-shielding matrix includes at least two layers: a light absorbing layer in contact with the transparent substrate, and a light reflecting layer laminated on the light absorbing layer.

Preferably, the light absorbing layer is a polymer layer in which a black pigment is dispersed.

Preferably, the black pigment is carbon black.

Preferably, the light reflecting layer is a polymer layer in which a white dye is dispersed.

Preferably, the white pigment is titanium dioxide, calcium carbonate, calcium sulfate, zinc oxide, barium sulfate, barium carbonate, silica, aluminum powder, kaolin, clay, talc, montmorillonite, aluminum hydroxide or magnesium carbonate.

Preferably, the thickness of the light reflecting layer accounts for more than 80% of the thickness of the light shielding matrix.

Preferably, the light-shielding matrix is divided into three layers including: the light-absorbing layer comprises two light-absorbing layers and a light reflecting layer sandwiched between the two light-absorbing layers, wherein one light-absorbing layer is in contact with the transparent substrate.

Preferably, the red quantum dot polymer layer is contained in part of the pixel openings, the green quantum dot polymer layer is contained in part of the pixel openings, and the quantum dot polymer layer is not contained in part of the pixel openings.

According to another aspect of the present application, there is provided a display device including: the quantum dot color film comprises a backlight unit, the quantum dot color film and a liquid crystal layer between the backlight unit and the quantum dot color film.

According to another aspect of the present application, there is provided a display device including: a substrate having a plurality of pixel regions; an electroluminescent device in the pixel region; and the quantum dot color film faces the substrate, and the pixel opening of the quantum dot color film is arranged corresponding to the pixel region of the substrate.

The application has the following beneficial effects: by adopting the shading matrix consisting of the reflecting layer and the light absorbing layer, the absorption of the black matrix to the emitted light of the quantum dot polymer layer in the prior art can be reduced, so that the light conversion efficiency of the quantum dot color film is increased, and meanwhile, the mutual interference of colors in different pixel openings can be effectively avoided.

Drawings

Fig. 1 is a schematic structural diagram of a quantum dot color film according to an exemplary embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a quantum dot color film according to an exemplary embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a quantum dot color film according to an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a display device according to an exemplary embodiment of the present application;

fig. 5 is a schematic structural diagram of a display device according to an exemplary embodiment of the present application.

Detailed Description

The technical solutions in the examples of the present application will be described in detail below with reference to the embodiments of the present application. It should be noted that the described embodiments are only some embodiments of the present application, and not all embodiments.

According to some exemplary embodiments of the present application, as shown in fig. 1, a quantum dot color film 10 includes a transparent substrate 11, a light-shielding matrix 12 disposed on a surface of the transparent substrate 11, where the light-shielding matrix 12 includes a plurality of pixel openings 13, and at least some of the pixel openings 13 include a quantum dot polymer layer 131; in the thickness direction, the light shielding matrix 12 includes at least two layers: a light absorbing layer 121 in contact with the transparent substrate 11, and a light reflecting layer 122 laminated on the light absorbing layer 121.

The light-shielding matrix 12 partitions the plurality of pixel openings 121 so that light emission between different pixel openings 121 is not affected by each other. The quantum dot polymer layer 131 may emit light of another color when excited by an external light source. Due to the existence of the reflective layer 122, the light emitted by the quantum dot polymer layer 131 will be reflected, so that the absorption of the light-shielding matrix 12 on the quantum dot polymer layer 131 can be reduced, and the light conversion efficiency of the quantum dot color film 10 can be increased.

The quantum dot polymer layer 131 includes a polymer matrix and quantum dots dispersed therein, and the polymer matrix may be polyacrylic resin, polyepoxy resin, polyamine resin, or polysilicon resin, etc. The quantum dots can be group II-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements or compounds, group I-III-VI compounds, group I-II-IV-VI compounds, perovskite compounds, or combinations thereof.

The light absorbing layer 121 may be formed of a polymer layer in which a black dye is dispersed, and the black dye is preferably carbon black such as carbon black particles; the polymer material can be polyacrylic resin, polyepoxy resin, polysilicone resin and the like.

The light absorbing layer 121 may be formed on the transparent substrate 11 by photolithography of a photoresist. Since the light absorbing layer 121 has a very high absorptivity of light, the light absorbing layer 121 can reduce the mixture of colors between different pixel openings 13.

The reflective layer 122 may be a polymer layer dispersed with white dye, and the white dye may be titanium oxide, calcium carbonate, calcium sulfate, zinc oxide, barium sulfate, barium carbonate, silica, aluminum powder, kaolin, clay, talc, montmorillonite, aluminum hydroxide, or magnesium carbonate.

The light reflecting layer 122 may be formed on the light absorbing layer 121 by photolithography of a photoresist.

In a preferred embodiment, the thickness of the light reflecting layer 122 accounts for more than 80% of the thickness of the light-shielding matrix 12, so that the light emitted from the quantum dot polymer layer 131 can be sufficiently reflected, and the absorption of the light emitted from the quantum dot polymer layer 131 by the light absorbing layer 121 can be reduced.

The thickness of the quantum dot polymer layer 131 is preferably substantially equal to the depth of the pixel opening 121. That is, the quantum dot polymer layer 131 substantially fills the pixel opening 121.

In one embodiment, as shown in fig. 2, a quantum dot color film 20 includes a transparent substrate 21, and a light-shielding matrix 22 disposed on a surface of the transparent substrate 21, where the light-shielding matrix 22 includes a plurality of pixel openings 23, and at least some of the pixel openings 23 include a quantum dot polymer layer 231; in the thickness direction, the light shielding matrix 22 includes three layers: two light absorbing layers 221, and a light reflecting layer 222 sandwiched between the two light absorbing layers 221, wherein one light absorbing layer 221 is in contact with the transparent substrate 21. The light absorbing layer 221 is additionally disposed on the light reflecting layer 222, which is beneficial to reducing the undesirable interference between light rays entering different pixel openings 23.

In one embodiment, as shown in fig. 3, a quantum dot color film 30 includes a transparent substrate 31, a light-shielding matrix 32 disposed on a surface of the transparent substrate 31, where the light-shielding matrix 32 includes a plurality of pixel openings 33, at least a portion of the pixel openings 33 include a red quantum dot polymer layer 331a, at least a portion of the pixel openings 33 include a green polymer layer 331b, and a portion of the pixel openings 33 do not include a quantum dot polymer layer (denoted as 332); in the thickness direction, the light shielding matrix 32 includes two layers: a light absorbing layer 321 in contact with the transparent substrate 31, and a light reflecting layer 322 laminated on the light absorbing layer 321. When the quantum dot color film 30 is used, a blue light source can be used as a backlight source, the red quantum dot polymer layer 331a emits red light, the green quantum dot polymer layer 331b emits green light, and the pixel opening 332 without the quantum dot polymer layer directly displays blue of the backlight source, so that three primary colors of red, green and blue light of the display panel are obtained.

According to another embodiment of the present application, as shown in fig. 4, a display device 4 is provided, where the display device 4 includes a quantum dot color film 40, a backlight 42 for providing light, and a liquid crystal layer 41 located between the backlight 42 and the quantum dot color film 40.

According to another embodiment of the present application, as shown in fig. 5, there is provided a display device 5, the display device 5 including a substrate 51 having a plurality of pixel regions 511, an electroluminescent device 512 located in the pixel regions 511; and a quantum dot color film 50 disposed facing the substrate 51, wherein a pixel opening 53 of the quantum dot color film 50 is disposed corresponding to the pixel region 511.

Although the present disclosure has been described and illustrated in greater detail by the inventors, it should be understood that modifications and/or alterations to the above-described embodiments, or equivalent substitutions, will be apparent to those skilled in the art without departing from the spirit of the disclosure, and that no limitations to the present disclosure are intended or should be inferred therefrom.

Claims

1. A quantum dot color film, comprising:

a transparent substrate; and

a light-shielding matrix disposed on the transparent substrate, the light-shielding matrix having a plurality of pixel openings, at least a portion of the pixel openings containing a quantum dot polymer layer therein;

in the thickness direction, the light-shielding matrix includes at least two layers: a light absorbing layer in contact with the transparent substrate, and a light reflecting layer laminated on the light absorbing layer.

2. The quantum dot color film of claim 1, wherein the light absorbing layer is a polymer layer dispersed with a black pigment.

3. The quantum dot color film of claim 2, wherein the black pigment is carbon black.

4. The quantum dot color film of claim 1, wherein the light reflecting layer is a polymer layer dispersed with a white dye.

5. The quantum dot color film of claim 4, wherein the white dye is titanium dioxide, calcium carbonate, calcium sulfate, zinc oxide, barium sulfate, barium carbonate, silica, aluminum powder, kaolin, clay, talc, montmorillonite, aluminum hydroxide, or magnesium carbonate.

6. The quantum dot color film of claim 1, wherein the thickness of the reflective layer accounts for more than 80% of the thickness of the light-blocking matrix.

7. The quantum dot color film of claim 1, wherein the shading matrix is divided into three layers, comprising: the light-absorbing layer comprises two light-absorbing layers and a light-reflecting layer clamped in the two light-absorbing layers, wherein one light-absorbing layer in the two light-absorbing layers is in contact with the transparent substrate.

8. The quantum dot color film of claim 1, wherein a portion of the pixel openings contain a red quantum dot polymer layer, a portion of the pixel openings contain a green quantum dot polymer layer, and a portion of the pixel openings do not contain a quantum dot polymer layer.

9. A display device, comprising:

a backlight unit, a quantum dot color film as claimed in any one of claims 1 to 8, and a liquid crystal layer interposed between the backlight unit and the quantum dot color film.

10. A display device, comprising:

a substrate having a plurality of pixel regions, an electroluminescent device located in the pixel regions;

the quantum dot color film according to any one of claims 1 to 8 facing the substrate, wherein a pixel opening of the quantum dot color film is disposed corresponding to a pixel region of the substrate.