CN110518148A - Preparation method, display base plate, display panel and the control method of display base plate - Google Patents

Abstract

This application provides a kind of preparation method of display base plate, display base plate, display panel and control methods, comprising: substrate；Positioned at pixel defining layer on the substrate, and it is stacked first electrode layer, organic luminous layer, the second electrode lay, electrochromic layer and third electrode layer on the substrate；Wherein, the first electrode layer is located on the substrate, the electrochromic layer is between the second electrode lay and third electrode layer, and the switching of transparent state and dark-state is presented under the action of the second electrode lay and the third electrode layer, when not showing to solve current OLED display device, shinny problem is still remained.

Description

Manufacturing method of display substrate, display substrate, display panel and control method

technical field

The present application relates to the field of display technology, in particular to a method for preparing a display substrate, a display substrate, a display panel and a control method.

Background technique

OLED (Organic Light-Emitting Diode) display is a new type of display device. Compared with liquid crystal display, OLED display has the advantages of self-illumination, fast response speed and wide viewing angle, and can perform flexible display, transparent display and 3D display. Therefore, it has been rapidly developed and popularized.

In the prior art, in order to reduce the reflection of external light, OLED display devices generally set a color filter and a black matrix on the packaging film after the OLED structure is packaged, so as to realize the reflection of external light, but because the color filter is When the light is filtered, when the display device is not displaying, there will still be a problem of luminescence due to the irradiation of external ambient light.

Contents of the invention

The present application provides a method for preparing a display substrate, a display substrate, a display panel and a control method, so as to solve the problem that current OLED display devices still emit light when they are not displaying.

In order to solve the above problems, the present application discloses a display substrate, including:

Substrate;

a pixel definition layer on the substrate, and a first electrode layer, an organic light-emitting layer, a second electrode layer, an electrochromic layer and a third electrode layer stacked on the substrate;

Wherein, the first electrode layer is located on the substrate, the electrochromic layer is located between the second electrode layer and the third electrode layer, and between the second electrode layer and the third electrode layer Under the action of the transparent state and the dark state switching.

Optionally, the pixel definition layer divides a plurality of pixel regions on the substrate, and each pixel region is stacked with the first electrode layer, the organic light emitting layer, the second electrode layer and The electrochromic layer; the third electrode layer covers the pixel definition layer and the electrochromic layer.

Optionally, the pixel definition layer is doped with a black light-absorbing dye.

Optionally, conductive particles are doped in the electrochromic layer.

Optionally, the conductive particles include a metal layer, and the metal layer is filled with a resin material.

In order to solve the above problems, the present application also discloses a display panel, comprising the display substrate according to any one of claims 1-5, wherein an encapsulation layer is encapsulated on the display substrate.

Optionally, the encapsulation layer is covered with a power supply film for supplying power to the third electrode.

Optionally, the power supply film is a pressure film or a solar film.

In order to solve the above problems, the present application also discloses a method for preparing a display substrate according to any one of claims 1-5, characterized in that it includes:

Provide the substrate;

forming a pixel definition layer on the substrate, and stacked first electrode layer, organic light-emitting layer, second electrode layer, electrochromic layer and third electrode layer, wherein the first electrode layer is located on the substrate , the electrochromic layer is located between the second electrode layer and the third electrode layer, and is switched between a transparent state and a dark state under the action of the second electrode layer and the third electrode layer.

Optionally, forming the electrochromic layer includes:

Doping conductive particles in electrochromic materials;

The electrochromic material doped with the conductive particles is formed on the side of the second electrode layer away from the substrate by photolithography or spin coating, to form the electrochromic layer.

In order to solve the above problems, the present application also discloses a display panel control method, which is applied to the display panel according to any one of claims 6-8, the method comprising:

When the display panel is in a display state, applying a voltage to the second electrode to make the electrochromic layer appear transparent;

When the display panel is in a non-display state, a voltage is applied to the third electrode to make the electrochromic layer appear in a dark state.

Compared with the prior art, the present application includes the following advantages:

First, the present application sets an electrochromic layer between the second electrode layer and the third electrode layer, and through the control of the second electrode layer and the third electrode layer, the electrochromic layer is switched between a transparent state and a dark state , so as to block the reflection of external ambient light, thereby increasing the transmittance of the display panel and reducing power consumption.

Secondly, in the present application, conductive particles are doped in the electrochromic layer, which increases the charge transfer rate, thereby increasing the response speed of the electrochromic layer, and improves the light extraction efficiency of the OLED due to the scattering effect of the conductive particles.

Of course, implementing any product of the present application does not necessarily need to achieve all the above-mentioned advantages at the same time.

Description of drawings

FIG. 1 is a schematic structural view of a display substrate in a dark state according to Embodiment 1 of the present application;

FIG. 2 is a schematic structural view of a display substrate in a transparent state described in Embodiment 1 of the present application;

FIG. 3 is a schematic structural diagram of a display panel described in Embodiment 2 of the present application;

FIG. 4 is a flow chart of a method for preparing a display substrate described in Embodiment 3 of the present application;

FIG. 5 is a flow chart of a method for controlling a display panel described in Embodiment 4 of the present application.

Detailed ways

In order to make the above objects, features and advantages of the present application more obvious and comprehensible, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

Embodiment one

The display substrate in the present application includes: a substrate, a pixel definition layer located on the substrate, and a first electrode layer, an organic light-emitting layer, a second electrode layer, an electrochromic layer and a first electrode layer stacked on the substrate. three electrode layers.

Wherein, the first electrode layer is located on the substrate, the electrochromic layer is located between the second electrode layer and the third electrode layer, and between the second electrode layer and the third electrode layer Under the action of the transparent state and the dark state switching.

In a specific implementation, as an implementation, the first electrode layer, the organic light-emitting layer, the second electrode layer, the electrochromic layer and the third electrode layer can be formed on the entire surface of the pixel definition layer of the substrate, specifically including:

A substrate is provided.

Wherein, the material of the substrate can be a glass substrate, a plastic substrate or a metal substrate. Specifically, for a top-emitting OLED display panel, a glass cover or a plastic substrate can be used for packaging to ensure that the light output of the top-emitting OLED display panel is not blocked. , and for a bottom-emitting OLED display panel, a glass substrate or a plastic substrate or a metal substrate can be used.

A pixel definition layer overlying the substrate.

Wherein, the pixel definition layer is doped with a black light-absorbing dye, which can prevent the reflection of external ambient light to a certain extent, and can also prevent light leakage and cross-color problems. In practical applications, the absorbance of the black light-absorbing dye generally adopts an absorbance greater than or equal to 4 black light absorbing dyes.

The first electrode layer covering the substrate.

An organic light-emitting layer covering the first electrode layer.

The second electrode layer covering the organic light emitting layer.

An electrochromic layer covering the second electrode layer.

A third electrode layer covering the electrochromic layer.

Wherein, the material of the electrochromic layer can be an inorganic material or an organic material, and the inorganic material can include any one of nickel oxide, iridium oxide, and tungsten oxide, and the organic material can include polypyrrole, polythiophene, and polyaniline. Any one, the present application does not specifically limit it.

In a specific application, conductive particles can be doped in the electrochromic layer to increase the charge transfer, thereby increasing the response speed of the electrochromic layer, and improving the light extraction efficiency of the display device through the scattering effect of the conductive particles.

Wherein, the conductive particles include a metal layer, the metal layer is filled with a resin material, and the particle diameter of the conductive particles ranges from 1 um to 4 um.

The metal layer may use conductive metal materials, such as nickel or copper, or other conductive metal materials, which are not specifically limited in this application.

The resin material may include any one of polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), and polystyrene (PS), which is not specifically limited in this application.

In this application, the first electrode layer, the second electrode layer and the third electrode layer can be selected from indium tin oxide ITO or indium gallium zinc oxide IGZO, etc., which is not specifically limited in this application.

In practical applications, when the OLED is in the non-display state, the first control component is coupled to the third electrode layer to apply a forward voltage to the third electrode layer, and due to the oxidation reaction of the electrochromic material, the The electrochromic layer changes from a transparent state to a dark state, thereby blocking the reflection of external ambient light.

When the OLED is in the display state, it is coupled to the second electrode layer through the second control component, and is used to apply a negative voltage to the second electrode layer, and the electrochromic material is caused by the redox reaction of the electrochromic material to cause the electrochromic The layer changes from a dark state to a transparent state, allowing the light emitted by the OLED to pass through and display normally, and when the OLED is displayed, because the pixel definition layer is doped with a black light-absorbing dye, it can prevent the reflection of external ambient light to a certain extent, and can also prevent Light leakage and cross-color problems.

As another implementation, the present application can also divide the pixel definition layer into a plurality of pixel areas, and each pixel area is stacked with a first electrode layer, an organic light-emitting layer, a second electrode layer, an electrochromic layer, and a second electrode layer. three electrode layers. The structure of the display substrate will be described in detail below with reference to FIG. 1 .

Referring to Figure 1, it is a schematic diagram of a display substrate described in Embodiment 1 of the present application, which specifically includes:

Substrate 101.

A pixel definition layer 102 on the substrate.

The pixel definition layer 102 divides a plurality of pixel regions on the substrate.

Each of the pixel regions is stacked with the first electrode layer 103 , the organic light emitting layer 104 , the second electrode layer 105 and the electrochromic layer 106 .

Specifically, the organic light emitting layer is covered on the first electrode layer, the second electrode layer is covered on the organic light emitting layer, and the electrochromic layer is covered on the second electrode layer.

The third electrode layer 107 covers the pixel definition layer 102 and the electrochromic layer 106 .

Wherein, the pixel definition layer is doped with a black light-absorbing dye, which can prevent the reflection of external ambient light to a certain extent, and can also prevent light leakage and cross-color problems. In practical applications, the absorbance of the black light-absorbing dye generally adopts an absorbance greater than or equal to 4 black light absorbing dyes.

In a specific application, due to the doping of conductive particles 108 in the electrochromic layer 106, the charge migration is increased, thereby increasing the response speed of the electrochromic layer, and improving the light extraction of the display device through the scattering effect of the conductive particles. efficiency.

Wherein, the conductive particles include a metal layer, the metal layer is filled with a resin material, and the particle diameter of the conductive particles ranges from 1 um to 4 um.

The metal layer may use conductive metal materials, such as nickel or copper, or other conductive metal materials, which are not specifically limited in this application.

The resin material may include any one of polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), and polystyrene (PS), which is not specifically limited in this application.

In practical applications, when the OLED is in the non-display state, the first control component is coupled to the third electrode layer to apply a forward voltage to the third electrode layer, and due to the oxidation reaction of the electrochromic material, the The electrochromic layer changes from a transparent state to a dark state, thereby blocking the reflection of ambient light, as shown in FIG. 1 .

When the OLED is in the display state, it is coupled to the second electrode layer through the second control component, and is used to apply a negative voltage to the second electrode layer, and the electrochromic material is caused by the redox reaction of the electrochromic material to cause the electrochromic The layer changes from a dark state to a transparent state, allowing the light emitted by the OLED to pass through and display normally, as shown in Figure 2.

In this embodiment, firstly, the application sets an electrochromic layer between the second electrode layer and the third electrode layer, and through the control of the second electrode layer and the third electrode layer, the electrochromic layer is in a transparent state and dark state switching, thereby blocking the reflection of external ambient light, thereby increasing the transmittance of the display panel, and reducing power consumption.

Secondly, in the present application, conductive particles are doped in the electrochromic layer, which increases the charge transfer rate, thereby increasing the response speed of the electrochromic layer, and improves the light extraction efficiency of the OLED due to the scattering effect of the conductive particles.

Embodiment two

Referring to FIG. 3 , it is a schematic structural diagram of a display panel described in Embodiment 2 of the present application, which specifically includes: the display substrate described in Embodiment 1 and an encapsulation layer 301 encapsulated on the display substrate.

The encapsulation layer 301 is covered with a power supply film 302 for supplying power to the third electrode.

The power supply film is a pressure film or a solar film.

In practical applications, when the power supply film is a pressure film, the pressure film supplies power to the third electrode layer on the electrochromic layer by converting the external pressure into electrical energy. Since the electrochromic layer belongs to a bistable structure , when the OLED is not displaying, it is necessary to apply a forward voltage to the third electrode layer, so the required power consumption is not large.

When the power supply film is a solar film, the solar film converts ambient light into electrical energy, and supplies power to the third electrode layer on the electrochromic layer. Since the electrochromic layer belongs to a bistable structure, it does not display on the OLED. When , it is necessary to apply a forward voltage to the third electrode layer, so the required power consumption is not large.

In this embodiment, the power consumption of the display panel is avoided by using a pressure film or a solar film to supply power to the third electrode layer.

Embodiment three

Referring to FIG. 4 , it is a flow chart of a method for preparing a display substrate described in Embodiment 3 of the present application, which includes the following steps:

Step 401: Provide a substrate.

Step 402 : forming a pixel definition layer, and stacked first electrode layer, organic light emitting layer, second electrode layer, electrochromic layer and third electrode layer on the substrate.

Wherein, the first electrode layer is located on the substrate, the electrochromic layer is located between the second electrode layer and the third electrode layer, and between the second electrode layer and the third electrode layer Under the action of the transparent state and the dark state switching.

As one of the implementation manners, step 402 includes the following steps:

Specifically, a pixel definition layer is formed on the substrate, and a black light-absorbing dye is doped into the pixel definition layer, and the pixel definition layer is prepared by exposure and development.

The first electrode layer is formed on the substrate by evaporation.

An organic light-emitting layer is vapor-deposited on the first electrode layer through a fine mask plate FMM.

The second electrode layer is vapor-deposited on the organic light-emitting layer through an open mask.

An electrochromic layer is formed on the second electrode layer.

Specifically, the steps of forming the electrochromic layer include:

Doping conductive particles in the electrochromic material. The electrochromic material doped with the conductive particles is formed on the side of the second electrode layer away from the substrate by photolithography or spin coating, to form the electrochromic layer.

Wherein, the conductive particles include a metal layer, and the metal layer is filled with a resin material.

As another implementation manner, step 402 includes the following steps:

The pixel definition layer divides a plurality of pixel regions on the substrate.

The first electrode layer, the organic light-emitting layer, the second electrode layer, and the electrochromic layer are stacked in each pixel region; the third electrode layer covers the pixel definition layer And the electrochromic layer.

In practical applications, the first electrode layer can be formed in each pixel area by evaporation. An organic light-emitting layer is vapor-deposited on the first electrode layer through a fine mask plate FMM.

A second electrode layer is vapor-deposited on the organic light-emitting layer through an open mask.

An electrochromic layer is formed on the second electrode layer.

Wherein, the step of forming the electrochromic layer comprises:

Doping conductive particles in the electrochromic material.

The electrochromic material doped with the conductive particles is formed on the side of the second electrode layer away from the substrate by photolithography or spin coating, to form the electrochromic layer.

Wherein, the conductive particles include a metal layer, and the metal layer is filled with a resin material.

A third electrode layer is formed on the electrochromic layer and the pixel defining layer by evaporation.

In this embodiment, firstly, an electrochromic layer is arranged between the second electrode layer and the third electrode layer, and the electrochromic layer is made transparent and dark through the control of the second electrode layer and the third electrode layer. state switching, thereby blocking the reflection of external ambient light, thereby increasing the transmittance of the display panel and reducing power consumption.

Secondly, in the present application, conductive particles are doped in the electrochromic layer, which increases the charge transfer rate, thereby increasing the response speed of the electrochromic layer, and improves the light extraction efficiency of the OLED due to the scattering effect of the conductive particles.

Embodiment four

Referring to FIG. 5 , it is a flow chart of a method for controlling a display panel according to Embodiment 4 of the present application. The method is applied to a display panel, and the method includes the following steps:

Step 501: When the display panel is in a display state, apply a voltage to the third electrode layer to make the electrochromic layer appear transparent.

Step 502: When the display panel is in a non-display state, apply a voltage to the second electrode layer to make the electrochromic layer appear in a dark state.

In this embodiment, the material of the electrochromic layer can be an inorganic material or an organic material, the inorganic material can include any one of nickel oxide, iridium oxide, and tungsten oxide, and the organic material can include polypyrrole, polythiophene, poly Any one of the anilines, which is not specifically limited in this application.

In a specific application, conductive particles can be doped in the electrochromic layer to increase the charge transfer, thereby increasing the response speed of the electrochromic layer, and improving the light extraction efficiency of the display device through the scattering effect of the conductive particles.

Wherein, the conductive particles include a metal layer, the metal layer is filled with a resin material, and the particle diameter of the conductive particles ranges from 1 um to 4 um.

The metal layer may use conductive metal materials, such as nickel or copper, or other conductive metal materials, which are not specifically limited in this application.

In this embodiment, through the control of the second electrode layer and the third electrode layer, the electrochromic layer is switched between a transparent state and a dark state, thereby blocking the reflection of external ambient light, thereby increasing the transmittance of the display panel, and reducing the power consumption.

It should be noted that, for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence, because Depending on the application, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions involved are not necessarily required by this application.

As for the above device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, please refer to part of the description of the method embodiment shown.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

It is easy for those skilled in the art to think that: any combination of the above-mentioned embodiments is feasible, so any combination of the above-mentioned embodiments is the embodiment of the present application, but due to space limitations, this description will be limited here Not detailed one by one.

While preferred embodiments of the present application have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, the appended claims are intended to be construed to cover the preferred embodiment and all changes and modifications which fall within the scope of the application.

A method for preparing a display substrate, a display substrate, a display panel, and a control method provided by the present application have been introduced above in detail. In this paper, specific examples are used to illustrate the principle and implementation of the present application. The above examples The description is only used to help understand the method of the present application and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation and application scope, in summary , the contents of this specification should not be construed as limiting the application.

Claims (11)

1. a kind of display base plate characterized by comprising

Substrate；

Positioned at pixel defining layer on the substrate, and it is stacked first electrode layer on the substrate, You Jifa Photosphere, the second electrode lay, electrochromic layer and third electrode layer；

Wherein, the first electrode layer is located on the substrate, and the electrochromic layer is located at the second electrode lay and third Between electrode layer, and in the second electrode lay and the switching that transparent state and dark-state are presented under the action of the third electrode layer.

2. display base plate according to claim 1, which is characterized in that the pixel defining layer marks off on the substrate Multiple pixel regions, each pixel region have been stacked the first electrode layer, the organic luminous layer, described second Electrode layer and the electrochromic layer；The third electrode layer covers the pixel defining layer and the electrochromic layer.

3. display base plate according to claim 1, which is characterized in that contaminated in the pixel defining layer doped with black light-absorbing Material.

4. display base plate according to claim 1, which is characterized in that doped with conducting particles in the electrochromic layer.

5. display base plate according to claim 4, which is characterized in that the conducting particles includes metal layer, the metal Resin material is filled in layer.

6. a kind of display panel, which is characterized in that including the described in any item display base plates of claim 1-5, the display base Encapsulated layer is packaged on plate.

7. display panel according to claim 6, which is characterized in that

Be covered on the encapsulated layer for the third electrode power for conductive film.

8. display panel according to claim 7, which is characterized in that described thin for pressure film or solar energy for conductive film Film.

9. a kind of preparation method of the display base plate as described in claim any one of 1-5 characterized by comprising

Substrate is provided；

Pixel defining layer, and first electrode layer, the organic luminous layer, the second electrode lay, electricity of stacking are formed on the substrate Mutagens chromatograph and third electrode layer, wherein the first electrode layer is located on the substrate, and the electrochromic layer is located at described Between the second electrode lay and third electrode layer, and present under the action of the second electrode lay is with the third electrode layer transparent The switching of state and dark-state.

10. preparation method according to claim 9, which is characterized in that form the electrochromic layer, comprising:

Conducting particles is adulterated in electrochromic material；

By doped with the electrochromic material of the conducting particles, second electricity is formed in by photoetching process or spin coating mode Pole layer deviates from the side of the substrate, forms the electrochromic layer.

11. a kind of control method of display panel, which is characterized in that be applied to such as the described in any item displays of claim 6-8 Panel, which comprises

When the display panel is in display state, Xiang Suoshu the second electrode lay applies voltage, makes the electrochromic layer be in Existing transparent state；

When the display panel is in non-display state, Xiang Suoshu third electrode layer applies voltage, makes the electrochromic layer Dark-state is presented.