WO2020233274A1

WO2020233274A1 - Substrate and manufacturing method thereof, liquid crystal display panel, and liquid crystal display device

Info

Publication number: WO2020233274A1
Application number: PCT/CN2020/084230
Authority: WO
Inventors: 刘松
Original assignee: 京东方科技集团股份有限公司
Priority date: 2019-05-17
Filing date: 2020-04-10
Publication date: 2020-11-26
Also published as: CN110161743A; CN110161743B

Abstract

A substrate (10) comprises: a base (101); a color filter layer (102) and a light shielding pattern (103) provided at one side of the base (101); a first electrode (104) provided at one side of the light shielding pattern (103) away from the base (101); and a second electrode (105) provided at one side of the light shielding pattern (103) close to the base (101). The color filter layer (102) comprises multiple light-filtering units (1021). The light-filtering unit (1021) is made of a material comprising a quantum dot material. The light shielding pattern (103) is provided between any two adjacent light-filtering units (1021). The first electrode (104) is in contact with at least a portion of a surface of the light shielding pattern (103) away from the base (101), and the first electrode (104) is in contact with at least a portion of a surface of each light-filtering unit (1021) away from the base (101). The second electrode (105) is in contact with at least a portion of a surface of the light shielding pattern (103) close to the base (101), and the second electrode (105) is in contact with at least a portion of a surface of each light-filtering unit (1021) close to the base (101). The light shielding pattern (103) is used to absorb light rays to produce a hole and an electron separate from each other, and to cause one of the hole and electron to be transported to the first electrode (104) and the other to be transported to the second electrode (105).

Description

Substrate and preparation method thereof, liquid crystal display panel and liquid crystal display device

This application claims the priority of the Chinese patent application with application number 201910415434.0 filed on May 17, 2019, the entire content of which is incorporated into this application by reference.

Technical field

The embodiments of the present disclosure relate to a substrate and a preparation method thereof, a liquid crystal display panel and a liquid crystal display device.

Background technique

The liquid crystal display (Liquid Crystal Display, referred to as LCD) has the characteristics of small size, low power consumption, and no radiation, and it occupies a major position in the current display market.

Summary of the invention

In one aspect, a substrate is provided. The substrate includes: a substrate; a color filter layer and a light shielding pattern provided on one side of the substrate; a first electrode provided on a side of the light shielding pattern away from the substrate; and a first electrode provided on the light shielding pattern The second electrode near the side of the substrate. The color filter layer includes a plurality of filter units, and the material of the filter unit includes a quantum dot material; the light shielding pattern is arranged between any two adjacent filter units. The first electrode is in contact with at least a part of the surface of the light shielding pattern away from the substrate, and the first electrode is in contact with at least a part of the surface of the plurality of filter units away from the substrate. The second electrode is in contact with at least a part of the surface of the light shielding pattern close to the substrate, and the second electrode is in contact with at least a part of the surface of the plurality of filter units close to the substrate. The light shielding pattern is configured to absorb light to generate separated holes and electrons, and transport one of the holes and the electrons to the first electrode, and the other to the second electrode .

In some embodiments, the work function of the light shielding pattern is greater than the work function of the second electrode, and the work function of the light shielding pattern is less than the work function of the first electrode; or, the work function of the light shielding pattern It is greater than the work function of the first electrode, and the work function of the light shielding pattern is smaller than the work function of the second electrode.

In some embodiments, the material of the light shielding pattern includes perovskite.

In some embodiments, the thickness of the light shielding pattern along a direction perpendicular to the substrate is about 200 nm to 300 nm.

In some embodiments, the first electrode is in contact with an edge portion of at least one side of the surface of the filter unit away from the substrate.

In some embodiments, the width of the contact portion of the first electrode and the filter unit is about 1 μm to 2 μm.

In some embodiments, the material of the first electrode includes a metal conductive material or a transparent conductive material; the material of the second electrode includes a metal conductive material or a transparent conductive material.

In some embodiments, the orthographic projection of the first electrode on the substrate is within a range of the orthographic projection of the second electrode on the substrate.

In some embodiments, the orthographic projection of the second electrode on the substrate and the orthographic projection of the plurality of filter units on the substrate do not completely overlap.

In some embodiments, the shading pattern includes: a plurality of first shading strips and a plurality of second shading strips, the plurality of first shading strips are arranged in parallel, the plurality of second shading strips are arranged in parallel, and The plurality of first light-shielding bars and the plurality of second light-shielding bars are arranged crosswise. The first electrode includes: at least one first sub-electrode, each first sub-electrode is disposed on a surface of a first light shielding strip away from the substrate, and the first sub-electrode also extends to The edge portion of the filter unit on at least one side of the first light-shielding strip along its width direction; and/or, at least one second sub-electrode, each second sub-electrode is arranged on a second light-shielding strip away from the On the surface of one side of the substrate, and the second sub-electrode also extends to the edge portion of the filter unit on at least one side of the second light shielding strip along its width direction.

In some embodiments, the first sub-electrode extends to the edges of the filter unit on opposite sides of the first shading strip along its width direction; and/or, the second sub-electrode extends to the The second light-shielding strip is along the width direction of the edge parts of the filter unit on opposite sides.

In another aspect, a liquid crystal display panel is provided, and the liquid crystal display panel includes the substrate as described in any of the above embodiments.

In some embodiments, the substrate is a counter substrate; the liquid crystal display panel further includes: an array substrate; and a liquid crystal layer disposed between the array substrate and the counter substrate.

In another aspect, a liquid crystal display device is provided. The liquid crystal display device includes the liquid crystal display panel as described in any of the above embodiments; and, a backlight module disposed on one side of the liquid crystal display panel.

In another aspect, a method for preparing a substrate is provided. The preparation method of the substrate includes:

Provide substrate;

Forming a second electrode on one side of the substrate;

A color filter layer and a light shielding pattern are formed on the substrate on which the second electrode is formed; the color filter layer includes a plurality of filter units, and the material of the filter unit includes a quantum dot material; the light shielding pattern Arranged between any two adjacent filter units, the material of the light shielding pattern includes perovskite; wherein, the second electrode is in contact with at least a part of the surface of the light shielding pattern close to the substrate, and The second electrode is in contact with at least a part of the surface of the plurality of filter units close to the substrate;

A first electrode is formed on the side of the light shielding pattern away from the substrate, the first electrode is in contact with at least a part of the surface of the light shielding pattern away from the substrate, and the first electrode is in contact with the plurality of filters. At least a part of the surface contact of the light unit away from the substrate;

Wherein, the work function of the light shielding pattern is greater than the work function of the second electrode, and the work function of the light shielding pattern is less than the work function of the first electrode; or, the work function of the light shielding pattern is greater than that of the first electrode. The work function of one electrode, and the work function of the light shielding pattern is smaller than the work function of the second electrode.

In some embodiments, forming a light-shielding pattern on the side of the second electrode away from the substrate includes: coating a perovskite solution on the substrate and drying to form a perovskite film ; Perform a patterning process on the perovskite film to form the shading pattern.

Description of the drawings

In order to explain the technical solutions of the present disclosure more clearly, the following will briefly introduce the drawings that need to be used in some embodiments of the present disclosure. Obviously, the drawings in the following description are merely appendices to some embodiments of the present disclosure. Figures, for those of ordinary skill in the art, other drawings can be obtained based on these drawings. In addition, the drawings in the following description may be regarded as schematic diagrams, and are not limitations on the actual size of the products involved in the embodiments of the present disclosure, the actual process of the method, and the actual timing of the signals.

Figure 1 is a structural diagram of a color filter substrate according to the related technology;

2 is a structural diagram of a liquid crystal display device according to some embodiments of the present disclosure;

FIG. 3A is a top view of a substrate according to some embodiments of the present disclosure;

3B is a cross-sectional view of the substrate A-A′ in FIG. 3A;

Figure 3C is a top view of another substrate according to some embodiments of the present disclosure;

3D is a schematic cross-sectional view of the substrate B-B' in FIG. 3C;

4A is a top view of still another substrate according to some embodiments of the present disclosure;

4B is a top view of still another substrate according to some embodiments of the present disclosure;

FIG. 5A is a top view of still another substrate provided according to some embodiments of the present disclosure;

Fig. 5B is a cross-sectional view of the substrate C-C' in Fig. 5A;

FIG. 5C is a top view of still another substrate according to some embodiments of the present disclosure;

FIG. 6 is a top view of still another substrate according to some embodiments of the present disclosure;

Figure 7 is a cross-sectional view of a substrate according to some embodiments of the present disclosure;

FIG. 8 is a cross-sectional view of another substrate provided according to some embodiments of the present disclosure;

Fig. 9 is a flowchart of a method for preparing a substrate according to some embodiments of the present disclosure;

FIG. 10 is a flowchart of another method for preparing a substrate according to some embodiments of the present disclosure.

Detailed ways

The technical solutions in some embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art fall within the protection scope of the present disclosure.

Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms such as the third-person singular form "comprises" and the present participle form "comprising" are Interpreted as open and inclusive means "including, but not limited to." In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" "example)" or "some examples" are intended to indicate that a specific feature, structure, material, or characteristic related to the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics described may be included in any one or more embodiments or examples in any suitable manner.

Hereinafter, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

"At least one of A, B, and C" has the same meaning as "at least one of A, B, or C", and both include the following combinations of A, B, and C: only A, only B, only C, A and B The combination of A and C, the combination of B and C, and the combination of A, B and C.

"A and/or B" includes the following three combinations: A only, B only, and the combination of A and B.

The use of "applicable to" or "configured to" in this document means open and inclusive language, which does not exclude devices suitable for or configured to perform additional tasks or steps.

As used herein, "about" or "approximately" includes the stated value as well as the average value within the acceptable deviation range of the specified value, where the acceptable deviation range is considered by those of ordinary skill in the art to be discussed The measurement and the error associated with the measurement of a specific quantity (ie, the limitations of the measurement system).

The exemplary embodiments are described herein with reference to cross-sectional views and/or plan views as idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in the shape with respect to the drawings due to, for example, manufacturing technology and/or tolerances are conceivable. Therefore, the exemplary embodiments should not be construed as being limited to the shape of the area shown herein, but include shape deviation due to, for example, manufacturing. For example, the etched area shown as a rectangle will generally have curved features. Therefore, the areas shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shape of the area of the device, and are not intended to limit the scope of the exemplary embodiments.

In the related art, the liquid crystal display includes a liquid crystal display panel and a backlight module. Taking a liquid crystal display panel including a color filter substrate 10 (for example, the color filter substrate 10 is an opposing substrate arranged in a box with an array substrate) as an example, as shown in FIG. 1, the color filter substrate 10 includes a substrate 101, which is arranged on the substrate The color filter layer 102A and the light shielding pattern 103A on 101. The material of the color filter layer 102A is a photoresist material. The color filter layer 102A includes a plurality of filter units 1021A, the plurality of filter units 1021A are used to filter the light entering it, the three primary colors used for color display are transmitted through and other light is absorbed. The light-shielding pattern 103A is arranged between any adjacent filter units 1021A. The light-shielding pattern 103A has the function of absorbing all light in the visible light band, and is used to space the filter units 1021A apart to prevent occurrence between different filter units 1021A. Cross color, affect the display effect.

However, since the light used for the LCD display is provided by the backlight module, the light shielding pattern 103A and the color filter layer 102A will absorb the light emitted by the backlight module to the LCD panel, which causes the LCD panel to affect the light provided by the backlight module. The utilization rate is low.

Based on this, some embodiments of the present disclosure provide a liquid crystal display device 200. As shown in FIG. 2, the liquid crystal display device 200 includes a liquid crystal display panel 2 and a backlight module 3 disposed on the light incident side of the liquid crystal display panel 2. Wherein, the liquid crystal display device 200 can be any product or component with a display function, such as AR helmets, AR glasses, mobile phones, tablet computers, televisions, monitors, notebook computers, digital photo frames, and navigators.

The backlight module 3 may be an edge-type backlight module. In this case, the backlight module 3 includes a light guide plate, a light source arranged on the light entrance side of the light guide plate, and an optical film arranged on the light exit side of the light guide plate. The optical film may include, for example, a lower diffuser and an upper diffuser, wherein the lower diffuser is located on the surface of the light-emitting side of the light guide plate; for another example, the optical film may also include a prism sheet, which is located between the lower diffuser and the upper diffuser. On this basis, the backlight module 3 may also include a reflective sheet disposed on the other side of the light guide plate opposite to the light emitting side.

Alternatively, the backlight module 3 may be a direct type backlight module. In this case, the backlight module 3 includes a lamp panel and an optical film disposed above the lamp panel (for example, the optical film in the above-mentioned edge-type backlight module). sheet). In addition, a reflector can be set under the light board.

As shown in FIG. 2, the liquid crystal display panel 2 includes an array substrate 20 and a counter substrate 21 disposed opposite to each other, and a liquid crystal layer 23 disposed between the array substrate 20 and the counter substrate 21. As shown in FIG. 2, the array substrate 20 and the counter substrate 21 are pasted together by the frame sealant 22, so that the liquid crystal layer 23 is confined in the area enclosed by the frame sealant 22.

Some embodiments of the present disclosure provide a substrate. The substrate may be the aforementioned array substrate 20 or the aforementioned counter substrate 21 (for example, the counter substrate 21 can be the aforementioned color filter substrate 10). It should be noted that this embodiment does not limit this. In practical applications, the substrate can also be applied to other display devices than liquid crystal display devices, for example, it can also be used as a color film substrate in a white light emitting diode display device.

Referring to FIGS. 3A to 3D, the substrate 1 includes: a substrate 101, a color filter layer 102 provided on one side of the substrate 101 and a light shielding pattern 103. The color filter layer 102 includes a plurality of filter units 1021, and the material of the filter unit 1021 includes quantum dot materials. The light shielding pattern 103 is arranged between any two adjacent light filtering units 1021.

It can be understood that each filter unit 1021 is located in a sub-pixel area in a one-to-one correspondence. The plurality of filter units 1021 include a first color filter unit, a second color filter unit, and a third color filter unit. The first color, the second color, and the third color are three primary colors, for example, the first color filter unit The unit, the second color filter unit, and the third color filter unit are a red filter unit R, a green filter unit G, and a blue filter unit B.

Exemplarily, as shown in FIG. 3A and FIG. 3C, the multiple filter units 1021 are distributed in multiple rows and multiple columns, that is, the multiple filter units 1021 are distributed in an array. Wherein, the filter units 1021 in each column of filter units 1021 are the same color filter units 1021, and two filter units 1021 located in any two adjacent columns of filter units 1021 have different colors. Alternatively, the filter units 1021 in each row of filter units 1021 are the same color, and the colors of the two filter units 1021 in any two adjacent rows of filter units 1021 are different.

In the case where the material of the filter unit 1021 includes quantum dot material, since the size of the quantum dot determines its emission color, the size of the quantum dot in the first color filter unit, the size of the quantum dot in the second color filter unit, The sizes of the quantum dots in the third color filter unit are different from each other. For example, in the case where the first color filter unit, the second color filter unit, and the third color filter unit are the red filter unit R, the green filter unit G, and the blue filter unit B, respectively, the red filter unit The size of the quantum dots in unit R is about 2.2nm～2.6nm (for example, "about" means that the range can fluctuate by ten percent), for example, 2.4nm. The size of quantum dots in the green filter unit G is about 1.5nm ~1.9nm (such as "about" means that the range can fluctuate by ten percent), for example, 1.7nm, the size of the quantum dots in the blue filter unit B is about 0.8nm~1.2nm (such as "about" refers to the The range can fluctuate by ten percent), for example, 1.0 nm.

The red filter unit R, the green filter unit G, and the blue filter unit B described above filter the light from the backlight module 3 through quantum dots, that is, the red filter unit R, the green filter unit G, and the blue filter unit. The color filter unit B can respectively absorb the light provided by the backlight module, and convert the absorbed light into light corresponding to its color. That is, the light emitted from the red filter unit R is red light, the light emitted from the green filter unit G is green light, and the light emitted from the blue filter unit B is blue light. It is worth noting that the red light, green light and blue light emitted by the quantum dot conversion excitation in this embodiment have higher light color purity.

Exemplarily, the quantum dots in this embodiment may use one or more of CdSe (cadmium selenide) and CdTe (tellurium selenide).

Based on the above, as shown in FIGS. 3A and 3B, the above-mentioned substrate 1 further includes a first electrode 104 and a second electrode 105. The first electrode 104 is disposed on the side of the light shielding pattern 103 away from the substrate 101, the first electrode 104 is in contact with at least a part of the surface of the light shielding pattern 103 away from the substrate 101, and the first electrode 104 is away from the plurality of filter units 1021 At least a part of the surface of the substrate 101 is in contact, the second electrode 105 is arranged on the side of the light shielding pattern 103 close to the substrate 101, the second electrode 105 is in contact with at least a part of the surface of the light shielding pattern 103 near the substrate 101, and the second electrode 105 is in contact with The plurality of filter units 1021 are in contact with at least a part of the surface close to the substrate 101.

As for the light-shielding pattern 103, it is configured to absorb light (for example, light from the aforementioned backlight module 3) to generate separated holes and electrons, and enable the holes and electrons to be transported to the first electrode 104 and the first electrode 104 and the first electrode, respectively. Two electrodes 105.

That is, the light shielding pattern 103 can absorb the light emitted from the backlight module 3 into the light shielding pattern 103 on the one hand, and act as an isolation filter unit 1021. On the other hand, after the light shielding pattern 103 absorbs light, it can generate separated holes and electrons, and can transmit the holes and electrons to the first electrode 104 and the second electrode 105, respectively, so that the first electrode 104 and the second electrode An electric field is generated between 105. And because the first electrode 104 and the second electrode 105 are also in contact with the filter unit 1021, and the material of the filter unit 1021 is quantum dots, which is a nano-level semiconductor material, the filter unit 1021 can be used in the first The electrode 104 and the second electrode 105 are excited under the action of the electric field generated by the second electrode 105. Therefore, the red filter unit R can emit red light, the green filter unit G emits green light, and the blue filter unit B emits blue light, that is, filter light. Unit 1021 also has the function of electroluminescence.

In the substrate 1 in this embodiment, the light shielding pattern 103 absorbs light to generate holes and electrons, and then the holes and electrons are transmitted to the filter unit 1021 made of quantum dot material through the first electrode 104 and the second electrode 105, respectively. As a result, the filter unit 1021 generates electroluminescence. Compared with the related art photoresist material, the color filter layer only has a light filtering function, and the light absorbed by the light shielding pattern cannot be reused. In this embodiment, the light filter unit 1021 of quantum dot material not only has a light filtering function, but the light filter unit 1021 of quantum dot material can also absorb light through the light shielding pattern 103 to generate holes and electrons for electroluminescence. Therefore, the substrate 1 in this embodiment can increase the utilization rate of the light provided by the backlight module 3 by the liquid crystal display panel 2, enhance the display brightness and display effect of the liquid crystal display panel 2, and reduce the energy consumption of the liquid crystal panel 2.

Those skilled in the art should understand that when the substrate 1 is the above-mentioned counter substrate 21, the substrate 1 is a color filter substrate. At this time, thin film transistors, pixel electrodes, etc. are provided on the array substrate 20, and a common electrode may also be provided on the array substrate 20. Of course, the common electrode can also be arranged on the substrate 1. In this case, the common electrode should be insulated from the first electrode 104 and the second electrode 105 described above.

When the substrate 1 is the aforementioned array substrate 20, that is, the color filter layer 102, the light shielding pattern 103, the first electrode 104 and the second electrode 105 are all located in the array substrate 20.

Based on the above, in order to ensure that the light shielding pattern 103 generates separated holes and electrons after absorbing light from the backlight module 3, and enables the holes and electrons to be transmitted to the first electrode 104 and the second electrode 105, respectively. In some examples, the work function of the light shielding pattern 103 is greater than the work function of the second electrode 105 and less than the work function of the first electrode 104. At this time, the light shielding pattern 103 can transmit holes to the first electrode 104 with a larger work function. , And transfer electrons to the second electrode 105 with a smaller work function; and in other examples, the work function of the light shielding pattern 103 is greater than the work function of the first electrode 104 and less than the work function of the second electrode 105. At this time, The light-shielding pattern 103 can transfer holes to the second electrode 105 with a larger work function, and transfer electrons to the first electrode 104 with a smaller work function.

Exemplarily, the material of the first electrode 104 includes a metal conductive material or a transparent conductive material; the material of the second electrode includes a metal conductive material or a transparent conductive material. Among them, the metal conductive material is, for example, Pt (platinum), and its work function is 5.6 eV. The transparent conductive material is, for example, ITO (Indium Tin Oxide, indium tin oxide), and its work function is 4.5 eV. The transparent conductive material may also be FTO (Fluorine-doped Tin Oxide), and its work function is 4.4 eV.

Hereinafter, the first electrode 104 is made of a metal conductive material, the second electrode 105 is made of a transparent conductive material, and the work function of the first electrode 104 is greater than the work function of the second electrode 105 as an example.

Exemplarily, the material of the light shielding pattern 103 includes perovskite. The work function of the perovskite material is 4.8 eV, that is, the work function of the light shielding pattern 103 is greater than the work function of the second electrode 105 and smaller than the work function of the first electrode 104 at this time.

Among them, perovskite is a type of semiconductor material with light absorption and electrocatalytic properties, and its molecular formula is ABX ₃ . Wherein A is CH ₃ NH ₃ , B is a metal cation, and the metal cation may be one of Pb, Se, Sn, and Ge; X is a halogen element, such as Cl, Br, and I. The characteristic of the perovskite molecular structure is that the X octahedrons with the metal cation at the B position as the center are co-apex connected, and are embedded in the tetragon with the ion at the A position as the apex.

Perovskite material is a direct band gap semiconductor material, which can absorb photons with energy greater than its band gap. The absorption coefficient of perovskite materials is even comparable to that of amorphous silicon. Perovskite materials with a thickness of about 200 nm to 300 nm can absorb almost all visible light. Therefore, perovskite materials can be used as a light-shielding material. When making the light-shielding pattern, the thickness of the light-shielding pattern can be set to be about 200nm～300nm (for example, "about" means that the range can fluctuate by ten percent), so that while effectively absorbing visible light, the thickness of the light-shielding pattern is reduced, so that The substrate is lighter and thinner; or, the thickness of the shading pattern can be set to be greater than 300 nm, so that more light can be absorbed, which is beneficial to improve the light-emitting brightness of the filter unit. At the same time, perovskite materials also have the advantages of high carrier mobility and long diffusion length. The high carrier mobility and long diffusion length are important parameters that determine the separation and transport of electrons and holes. Therefore, when the perovskite material absorbs light to generate electron-hole pairs, it can separate the electron-hole pairs inside. Furthermore, perovskite materials include organic components (such as CH ₃ NH ₃ ) and inorganic components (such as Pb and Cl), so they have the advantages of both. Inorganic components can provide electrons and holes with high efficiency. The molecular network required for transmission, and can improve the stability of the perovskite material, while the organic component makes the perovskite material have better solubility, is easy to be made into a film, and has a certain manufacturing cost. Advantage.

On this basis, optionally, the material of the light shielding pattern 103 includes CH ₃ NH ₃ PbBr ₃ (methylamine lead bromide), CH ₃ NH ₃ PbI ₃ (methylamine lead iodide), and CH ₃ NH ₃ PbCl At least one of ₃ (methylamine lead chloride).

To CH _{_₃} NH ₃ PbBr ₃ and CH _{_₃} NH ₃ PbI ₃ as an example, CH _{_₃} NH ₃ PbBr ₃ CH relative permittivity and _{_₃} NH ₃ PbI ₃ were 6.5 and 4.8; electron - hole pairs are bound 50meV and 76meV; the interaction force between electrons and holes is weak. At room temperature, electron-hole pairs can be separated from each other inside the perovskite material and be transported to the second electrode 105 and the first electrode 104.

The above-mentioned electron-hole pairs are transported to the second electrode 105 and the first electrode 104 because the perovskite material has a low electron and hole recombination rate, a high carrier mobility, and a longer diffusion length. Example, in the solution process by using CH _{_₃} NH ₃ PbI _3, the mobility of electrons and holes to reach 10cm ² / (V〃s), the large grain size 20μm and even up to 66cm ² / (V〃 s). Moreover, the density of bulk defect states in CH ₃ NH ₃ PbI ₃ is only about 5×10 ¹⁶ /cm ³ , which is much lower than the order of 10 ¹⁹ /cm ³ of other organic thin films grown by solution method. The diffusion length of electrons and holes in CH ₃ NH ₃ PbI ₃ is greater than 100 nm, and it is as high as 1 μm in CH ₃ NH ₃ PbI ₃ or CH ₃ NH ₃ PbCl _3. Therefore, electrons and holes can be transported to the second electrode 105 and the second electrode, respectively. One electrode 104.

In some embodiments, the first electrode 104 is in contact with an edge portion of at least one side of the surface of the filter unit 1021 away from the substrate 101. That is, as shown in FIGS. 3A and 3B, and FIGS. 3C and 3D, the first electrode 104 may be in contact with one side edge portion of the filter unit 1021. Alternatively, as shown in FIGS. 4A and 4B, the first electrode 104 may also be in contact with the edge portions of both sides of the filter unit 1021. Alternatively, as shown in FIGS. 5A and 5C, the first electrode 104 may be in contact with three-side edge portions of the filter unit 1021. Alternatively, as shown in FIG. 6, the first electrode 104 may be in contact with the edge portion of each side of the filter unit 1021.

In this embodiment, by contacting the first electrode 104 with the edge portion of at least one side of the surface of the filter unit 1021 away from the substrate 101, it is possible to reduce the impact on the filter unit 1021 when the first electrode 104 extends to the surface of the filter unit 1021. The influence caused by the light emitted by the unit 1021.

Exemplarily, as shown in FIGS. 3A, 3C, 4A, and 5C, the width L of the contact portion between the first electrode 104 and the filter unit 1021 is about 1 um to 2 um. This design can effectively reduce the influence of the first electrode 104 on the light emitted by the filter unit 1021 when the first electrode 104 extends to the surface of the filter unit 1021, thereby helping to improve the display brightness of the liquid crystal display panel.

In some embodiments, as shown in FIGS. 3A and 3B, FIGS. 3C and 3D, and FIGS. 4A and 4B, the light shielding pattern 103 includes a plurality of first light shielding strips 1031 and a plurality of second light shielding strips 1032. A plurality of first shading bars 1031 are arranged in parallel, a plurality of second shading bars 1032 are arranged in parallel, and a plurality of first shading bars and a plurality of second shading bars are arranged crosswise.

As shown in FIG. 5A, FIG. 5C, and FIG. 6, the first electrode 104 includes at least one first sub-electrode 1041, and each first sub-electrode 1041 is disposed on a surface of a first light shielding strip 1031 away from the substrate 101. And the first sub-electrode 1041 also extends to the edge portion of the filter unit 1021 on at least one side of the first light shielding strip 1031 along its width direction.

Wherein, as shown in FIG. 3A and FIG. 3B, FIG. 3C and FIG. 3D, the first sub-electrode 1041 may extend to the edge portion of the filter unit 1021 on one side of the first light shielding strip 1031 along its width direction. Alternatively, as shown in FIG. 4A, the first sub-electrode 1041 may extend to the edge portions of the filter unit 1021 on both sides of the first light shielding strip 1031 in the width direction thereof.

It should be noted that, as shown in FIGS. 3A and 3B, the first sub-electrode 1041 can completely cover the first light shielding strip 1031, but this embodiment is not limited to this. For example, as shown in FIGS. 3C and 3D, the first electrode 104 may also cover only a part of the first light shielding strip 1031.

In addition, FIGS. 3A and 3B, FIGS. 3C and 3D, and FIG. 4A take the first light-shielding strip 1031 extending in the vertical direction and the second light-shielding strip 1032 extending in the horizontal direction as an example for illustration, but this embodiment is not limited to this. For example, the first light shielding strip 1031 may extend in the horizontal direction, and the second light shielding strip 1032 may extend in the vertical direction.

In the above-mentioned embodiment where the first electrode 104 only includes at least one first sub-electrode 1041, the number of the first sub-electrodes 104 is small, which is convenient for manufacturing and low production cost.

Exemplarily, as shown in FIG. 4B, FIG. 5A, FIG. 5C, and FIG. 6, the first electrode 104 includes at least one second sub-electrode 1042. Each second sub-electrode 1042 is disposed on a surface of a second light-shielding strip 1032 away from the substrate 101, and the second sub-electrode 1042 also extends to filter light on at least one side of the second light-shielding strip 1032 along its width direction. The edge part of cell 1021.

Wherein, as shown in FIG. 4B, the first sub-electrode 1041 can extend to the edge portion of the filter unit 1021 on one side of the first light shielding strip 1031 in the width direction thereof. The second sub-electrode 1042 may extend to the edge portion of the filter unit 1021 on one side of the second light shielding strip 1032 in the width direction thereof.

Alternatively, as shown in FIG. 5A, the first sub-electrode 1041 may extend to the edge portions of the filter unit 1021 on both sides of the first light shielding strip 1031 in the width direction thereof. The second sub-electrode 1042 may extend to the edge portion of the filter unit 1021 on one side of the second light shielding strip 1032 in the width direction thereof.

Alternatively, as shown in FIG. 5C, the first sub-electrode 1041 may extend to the edge portion of the filter unit 1021 on one side of the first light shielding strip 1031 in the width direction thereof. The second sub-electrode 1042 may extend to the edge portions of the filter unit 1021 on both sides of the second light shielding strip 1032 in the width direction thereof.

Alternatively, as shown in FIG. 6, the first sub-electrode 1041 may extend to the edge portions of the filter unit 1021 on both sides of the first light shielding strip 1031 in the width direction thereof. The second sub-electrode 1042 may extend to the edge portions of the filter unit 1021 on both sides of the second light shielding strip 1032 in the width direction thereof.

It should be noted that the second sub-electrode 1042 may completely cover the second light-shielding strip 1032, or it may only cover a part of the second light-shielding strip 1032. This embodiment does not limit this.

In addition, in other embodiments, the first electrode 104 may also only include the above-mentioned second sub-electrode 1042 instead of the above-mentioned first sub-electrode 1041.

In some embodiments, the orthographic projection of the first electrode 104 on the substrate 101 is within the range of the orthographic projection of the second electrode 105 on the substrate 101. For example, the orthographic projection of the first electrode 104 on the substrate 101 may coincide with the orthographic projection of the second electrode 105 on the substrate 101. At this time, the second electrode 105 cannot easily block light from being directed to the light shielding pattern 103 and the filter unit. 1021, the light utilization rate is improved; for another example, the orthographic projection area of the first electrode 104 on the substrate 101 can be smaller than the orthographic projection area of the second electrode 105 on the substrate 101, so that the second electrode 105 can interact with the light-shielding pattern 103 and the filter unit 1021 are effectively electrically connected.

For the second electrode 105, optionally, as shown in FIG. 3B, FIG. 3D, and FIG. 5B, the second electrode 105 covers the light shielding pattern 103 and all the filter units 1021. This can make the preparation process of the second electrode 105 simpler.

Or, optionally, as shown in FIG. 7, the orthographic projection of the second electrode 105 on the substrate 101 and the orthographic projection of the filter unit 1021 on the substrate 101 do not completely overlap. In this way, the transmittance of the filter unit 1021 can be improved.

On this basis, as shown in FIG. 7, the substrate 1 may further include a transparent filling layer 106, which is filled in the hollow area between the second electrodes 105, and the transparent filling layer 106 is far from the substrate 101. The upper surface and the upper surface of the second electrode 105 away from the substrate 101 are on the same plane, so that the formation effect of the color filter layer 102 can be ensured, and the thickness of the multiple filter units can be made uniform. The light effect and luminous effect are more uniform.

The material of the transparent filling layer 106 may be organic.

In some embodiments, as shown in FIG. 8, the aforementioned substrate 1 further includes a flat layer 107 disposed on the side of the first electrode 104 away from the substrate 101, and the flat layer 107 can protect the first electrode 104, The role of the light shielding pattern 103 and the color filter layer 102.

In another aspect, referring to FIG. 9 and FIGS. 3A and 3B, some embodiments of the present disclosure provide a method for preparing the substrate 1, including:

S10, forming a second electrode 105 on the surface of one side of the substrate 101.

S11. A color filter layer 102 and a light shielding pattern 103 are formed on the surface of the second electrode 105 far away from the substrate 101; the color filter layer 102 includes a plurality of filter units 1021, and the light shielding pattern 103 is arranged in any adjacent filter Between the cells 1021; the second electrode 105 is in contact with at least a part of the surface of the light shielding pattern 103 close to the substrate 101, and the second electrode 105 is in contact with at least a part of the surface of the plurality of filter units 1021 close to the substrate 101.

S12. A first electrode 104 is formed on the surface of the light-shielding pattern 103 away from the substrate 101, the first electrode 104 is in contact with at least a part of the surface of the light-shielding pattern 103 away from the substrate 101, and the first electrode 104 and the plurality of filter units 1021 At least a part of the surface away from the substrate 101 is in contact.

Exemplarily, the first electrode 104 is a metal conductive material, the second electrode 105 is a transparent conductive material, the material of the light shielding pattern 106 includes perovskite, and the material of the filter unit 1021 includes a quantum dot material.

Wherein, the work function of the light shielding pattern 103 is greater than the work function of the second electrode 105 and less than the work function of the first electrode 104; or, the work function of the light shielding pattern 103 is greater than the work function of the first electrode 104 and less than the work function of the second electrode 105. Work function.

In this embodiment, the substrate 1 manufactured by the above S10 to S12 can absorb light through the light shielding pattern 103 to generate holes and electrons, and then transmit the holes and electrons to the substrate through the first electrode 104 and the second electrode 105, respectively. In the filter unit 1021 of quantum dot material, the filter unit 1021 generates electroluminescence. Compared with the related art photoresist material, the color filter layer only has a light filtering function, and the light absorbed by the light shielding pattern cannot be reused. In this embodiment, the light filter unit 1021 of quantum dot material not only has a light filtering function, but the light filter unit 1021 of quantum dot material can also absorb light through the light shielding pattern 103 to generate holes and electrons for electroluminescence. Therefore, the substrate 1 in this embodiment can increase the utilization rate of the light provided by the backlight module 3 by the liquid crystal display panel 2, enhance the display brightness and display effect of the liquid crystal display panel 2, and reduce the energy consumption of the liquid crystal panel 2.

Exemplarily, referring to FIG. 10, and FIGS. 3A and 3B, forming a light shielding pattern 103 on the substrate 101 on which the second electrode 105 is formed includes:

S111. Coating the perovskite solution on the second electrode 103 and drying it in the range of 90°-120°, for example, drying at 100° to form a perovskite film.

S112: Perform a patterning process on the perovskite film to form a light-shielding pattern. For example, the patterning process may include film formation, exposure, development, and etching.

Optionally, the above-mentioned perovskite solution can be produced by reacting a metal halide and a methylamine halide.

In this embodiment, the preparation method of the substrate is relatively simple. The substrate prepared according to the substrate can increase the utilization rate of the light provided by the backlight module by the liquid crystal display panel, enhance the display brightness and display effect of the liquid crystal display panel, and reduce the liquid crystal panel Energy consumption.

The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who thinks of changes or substitutions within the technical scope disclosed in the present disclosure shall cover Within the protection scope of this disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

A substrate, including:

Substrate

A color filter layer and a light shielding pattern arranged on one side of the substrate; the color filter layer includes a plurality of filter units, and the material of the filter unit includes a quantum dot material; the light shielding patterns are arranged on any two phases Between adjacent filter units;

A first electrode disposed on a side of the light shielding pattern away from the substrate, the first electrode is in contact with at least a part of the surface of the light shielding pattern away from the substrate, and the first electrode is in contact with the plurality of At least a part of the surface contact of the filter unit away from the substrate;

A second electrode disposed on the side of the light shielding pattern close to the substrate, the second electrode is in contact with at least a part of the surface of the light shielding pattern near the substrate, and the second electrode is in contact with the plurality of The filter unit is in contact with at least a part of the surface close to the substrate;

The light shielding pattern is configured to absorb light to generate separated holes and electrons, and transport one of the holes and the electrons to the first electrode, and the other to the second electrode .
The substrate according to claim 1, wherein the work function of the light shielding pattern is greater than the work function of the second electrode, and the work function of the light shielding pattern is less than the work function of the first electrode; or,

The work function of the light shielding pattern is greater than the work function of the first electrode, and the work function of the light shielding pattern is less than the work function of the second electrode.
The substrate according to claim 1 or 2, wherein the material of the light shielding pattern includes perovskite.
The substrate according to any one of claims 1 to 3, wherein the thickness of the light shielding pattern in a direction perpendicular to the substrate is about 200 nm to 300 nm.
The substrate according to any one of claims 1 to 4, wherein the first electrode is in contact with an edge portion of at least one side of a surface of the filter unit away from the substrate.
The substrate according to claim 5, wherein the width of the contact portion of the first electrode and the filter unit is about 1 μm to 2 μm.
The substrate according to any one of claims 1 to 6, wherein the material of the first electrode comprises a metal conductive material or a transparent conductive material;

The material of the second electrode includes metallic conductive material or transparent conductive material.
The substrate according to any one of claims 1 to 7, wherein:

The orthographic projection of the first electrode on the substrate is within a range of the orthographic projection of the second electrode on the substrate.
The substrate according to any one of claims 1 to 8, wherein the orthographic projection of the second electrode on the substrate and the orthographic projection of the plurality of filter units on the substrate are incomplete overlapping.
The substrate according to any one of claims 1-9, wherein the light shielding pattern comprises:

A plurality of first shading strips and a plurality of second shading strips, the plurality of first shading strips are arranged in parallel, the plurality of second shading strips are arranged in parallel, and the plurality of first shading strips are connected to the plurality of The second shading strips are arranged crosswise;

The first electrode includes:

At least one first sub-electrode, each first sub-electrode is arranged on a surface of a first light-shielding strip away from the substrate, and the first sub-electrode also extends to the first light-shielding strip along its The edge portion of the filter unit on at least one side in the width direction; and/or,

At least one second sub-electrode, each second sub-electrode is arranged on a surface of a second light-shielding strip away from the substrate, and the second sub-electrode also extends to the second light-shielding strip along it An edge portion of the filter unit on at least one side in the width direction.
10. The substrate according to claim 10, wherein the first sub-electrode extends to edges of the filter unit on opposite sides of the first light shielding strip along its width direction; and/or, the second sub-electrode The electrodes extend to the edge portions of the filter unit on opposite sides of the second light shielding strip along its width direction.
A liquid crystal display panel, including:

The substrate according to any one of claims 1 to 11.
The liquid crystal display panel according to claim 12, wherein the substrate is an opposite substrate; the liquid crystal display panel further comprises:

Array substrate; and,

A liquid crystal layer provided between the array substrate and the counter substrate.
A liquid crystal display device includes:

The liquid crystal display panel according to claim 12 or 13; and,

A backlight module arranged on one side of the liquid crystal display panel.
A method for preparing a substrate includes:

Provide substrate;

Forming a second electrode on one side of the substrate;

A color filter layer and a light shielding pattern are formed on the substrate on which the second electrode is formed; the color filter layer includes a plurality of filter units, and the material of the filter unit includes a quantum dot material; the light shielding pattern Arranged between any two adjacent filter units, the material of the light shielding pattern includes perovskite; wherein, the second electrode is in contact with at least a part of the surface of the light shielding pattern close to the substrate, and The second electrode is in contact with at least a part of the surface of the plurality of filter units close to the substrate;

A first electrode is formed on the side of the light shielding pattern away from the substrate, the first electrode is in contact with at least a part of the surface of the light shielding pattern away from the substrate, and the first electrode is in contact with the plurality of filters. At least a part of the surface contact of the light unit away from the substrate;

Wherein, the work function of the light shielding pattern is greater than the work function of the second electrode, and the work function of the light shielding pattern is less than the work function of the first electrode; or,

The work function of the light shielding pattern is greater than the work function of the first electrode, and the work function of the light shielding pattern is less than the work function of the second electrode.
15. The manufacturing method according to claim 15, wherein forming a light-shielding pattern on a side of the second electrode away from the substrate comprises:

Coating the perovskite solution on the substrate on which the second electrode is formed, and drying to form a perovskite film;

A patterning process is performed on the perovskite film to form the light shielding pattern.