Display substrate and preparation method thereof, and display device

Abstract

A display substrate and a method for preparing the same, and a display device, the display substrate comprising: an electrochromic structure disposed on a substrate, a light-emitting layer disposed on a side of the electrochromic structure away from the substrate, the electrochromic structure comprising a first electrode layer and an electrochromic layer, the electrochromic layer being configured to change between transparent and opaque according to a voltage of the first electrode layer and being opaque when the light-emitting layer emits light, the orthographic projection of the electrochromic layer on the substrate overlapping with the orthographic projection of the light-emitting layer on the substrate, and the orthographic projection of the first electrode layer on the substrate overlapping with the orthographic projection of the electrochromic layer on the substrate. In the solution provided in this embodiment, the electrochromic layer is opaque when the light-emitting layer emits light, which can block light from the side away from the light-emitting layer, thereby improving the resolution of the display, and does not need to increase the brightness to suppress ambient light, thereby reducing power and increasing the life of the display substrate.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to but are not limited to display technology, and in particular to a display substrate and a method for preparing the same, and a display device. Background Art

[0002] With the continuous development of display technology, organic light-emitting diode (OLED) technology is increasingly used in transparent displays. Transparent display is an important personalized display field of display technology. It refers to the display of images in a transparent state. Viewers can not only see the image in the display device, but also the scene behind the display device, which can realize virtual reality (VR) and augmented reality (AR) and 3D display functions. The premise of OLED as a flexible display is a flexible substrate material, and the ultra-thin OLED screen can achieve transparent display by adjusting the light transmittance of the film layer. Summary of the invention

[0003] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0004] The embodiments of the present disclosure provide a display substrate and a method for manufacturing the same, and a display device, which improve the display resolution of a transparent display.

[0005] An embodiment of the present disclosure provides a display substrate, which includes: an electrochromic structure arranged on a substrate, and a light-emitting layer arranged on a side of the electrochromic structure away from the substrate, the electrochromic structure including a first electrode layer and an electrochromic layer, the electrochromic layer being configured to change between transparent and opaque according to a voltage of the first electrode layer and being opaque when the light-emitting layer emits light, an orthographic projection of the electrochromic layer on the substrate overlapping with an orthographic projection of the light-emitting layer on the substrate, and an orthographic projection of the first electrode layer on the substrate overlapping with an orthographic projection of the electrochromic layer on the substrate.

[0006] In an exemplary embodiment, the first electrode layer is disposed on a side of the electrochromic layer away from the substrate, and the first electrode layer is a part of an anode that controls light emission of the light-emitting layer.

[0007] In an exemplary embodiment, the display substrate further includes a driving structure layer and a planar layer sequentially arranged between the base and the electrochromic structure, the planar layer is provided with a via hole exposing the driving structure layer, the first electrode layer is electrically connected to the driving structure layer through the via hole, and the orthographic projection of the electrochromic layer on the base is located outside the orthographic projection of the via hole on the base.

[0008] In an exemplary embodiment, the first electrode layer is arranged on a side of the electrochromic layer close to the substrate, and the display substrate further includes a second electrode layer and a third electrode layer sequentially arranged between the electrochromic layer and the light-emitting layer, the first electrode layer is electrically connected to the second electrode layer, the second electrode layer is electrically connected to the third electrode layer, and the first electrode layer, the second electrode layer and the third electrode layer constitute an anode for controlling the light emission of the light-emitting layer.

[0009] In an exemplary embodiment, the display substrate further includes a driving structure layer and a planar layer arranged between the base and the electrochromic structure, the planar layer is provided with a via hole exposing the driving structure layer, the first electrode layer is electrically connected to the driving structure layer through the via hole, and the orthographic projection of the via hole on the base is located within the orthographic projection of the electrochromic layer on the base.

[0010] In an exemplary embodiment, an orthographic projection of the electrochromic layer on the substrate is located within an orthographic projection of the first electrode layer on the substrate.

[0011] In an exemplary embodiment, the electrochromic layer is made of a material that is non-conductive in an opaque state.

[0012] In an exemplary embodiment, the material of the electrochromic layer includes polyaniline.

[0013] An embodiment of the present disclosure provides a display device, which includes the display substrate described in any of the above embodiments.

[0014] The present disclosure provides a method for preparing a display substrate, comprising:

[0015] An electrochromic structure is formed on a substrate, the electrochromic structure comprising a first electrode layer and an electrochromic layer, wherein an orthographic projection of the first electrode layer on the substrate overlaps with an orthographic projection of the electrochromic layer on the substrate; the electrochromic layer is configured to change between transparent and opaque according to a voltage of the first electrode layer;

[0016] A light-emitting layer is formed on the side of the electrochromic structure away from the substrate, and the orthographic projection of the electrochromic layer on the substrate overlaps with the orthographic projection of the light-emitting layer on the substrate; the electrochromic layer is configured to be opaque when the light-emitting layer emits light.

[0017] The disclosed embodiments include a display substrate and a method for preparing the same, and a display device. The display substrate includes: an electrochromic structure disposed on a substrate, a light-emitting layer disposed on a side of the electrochromic structure away from the substrate, the electrochromic structure includes a first electrode layer and an electrochromic layer, the electrochromic layer is configured to change between transparent and opaque according to the voltage of the first electrode layer and is opaque when the light-emitting layer emits light, the orthographic projection of the electrochromic layer on the substrate overlaps with the orthographic projection of the light-emitting layer on the substrate, and the orthographic projection of the first electrode layer on the substrate overlaps with the orthographic projection of the electrochromic layer on the substrate. In the solution provided by this embodiment, the electrochromic layer is opaque when the light-emitting layer emits light, which can block light from the side away from the light-emitting layer, thereby improving the resolution of the display, and does not need to increase the brightness to suppress ambient light, thereby reducing power and increasing the life of the display substrate.

[0018] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description and the drawings.

[0019] Other aspects will be apparent upon reading and understanding the drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution.

[0021] Figure 1 A schematic diagram of a display substrate provided for an exemplary embodiment;

[0022] Figure 2 A schematic diagram of a display substrate provided for another exemplary embodiment;

[0023] Figure 3 A schematic diagram of a display substrate provided for yet another exemplary embodiment;

[0024] Figure 4 A schematic diagram of the transparency and opacity of an electrochromic layer provided for an exemplary embodiment;

[0025] Figure 5 A schematic diagram showing that the electrochromic layer of a portion of pixels of a display substrate is opaque, provided as an exemplary embodiment;

[0026] Figure 6 A flow chart of a method for preparing a display substrate provided by an exemplary embodiment. DETAILED DESCRIPTION

[0027] The embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other arbitrarily.

[0028] The steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions. Also, although a logical sequence is shown in the flowchart, in some cases, the steps shown or described can be performed in a sequence different from that shown here.

[0029] Unless otherwise defined, technical or scientific terms used in the present disclosure should have the common meanings understood by one of ordinary skill in the art to which the present invention belongs.

[0030] In the drawings, the size of each component, the thickness of a layer, or the area is sometimes exaggerated for the sake of clarity. Therefore, the embodiments of the present disclosure are not necessarily limited to such dimensions, and the shapes and sizes of the components in the drawings do not reflect the true proportions. In addition, the drawings schematically show ideal examples, and the embodiments of the present disclosure are not limited to the shapes or values ​​shown in the drawings.

[0031] The ordinal numbers such as “first”, “second” and “third” in the present disclosure are provided to avoid confusion among constituent elements and do not indicate any order, quantity or importance.

[0032] In the present disclosure, for the sake of convenience, the words and phrases indicating the orientation or positional relationship, such as "middle", "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., are used to illustrate the positional relationship of the constituent elements with reference to the drawings. This is only for the convenience of describing the present specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the direction in which each constituent element is described. Therefore, it is not limited to the words and phrases described in the disclosure and can be appropriately replaced according to the circumstances.

[0033] In the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0034] In the present disclosure, "electrical connection" includes the case where components are connected together through an element having some kind of electrical function. There is no particular limitation on the "element having some kind of electrical function" as long as it can transmit and receive electrical signals between the connected components. Examples of "element having some kind of electrical function" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements having various functions.

[0035] In the present disclosure, "parallel" means a state where the angle formed by two straight lines is greater than -10° and less than 10°, and therefore, also includes a state where the angle is greater than -5° and less than 5°. In addition, "perpendicular" means a state where the angle formed by two straight lines is greater than 80° and less than 100°, and therefore, also includes a state where the angle is greater than 85° and less than 95°.

[0036] In the present disclosure, "film" and "layer" may be interchanged. For example, "conductive layer" may be replaced with "conductive film" in some cases. Similarly, "insulating film" may be replaced with "insulating layer" in some cases.

[0037] The transparent display screen has a high overall transmittance, which means that the light source from the back can easily stimulate the clarity of the screen display content under the entire viewing angle. Therefore, the application effect of transparent display in daytime or strong lighting environment needs to increase the brightness of the display itself to achieve relative clarity, resulting in high energy consumption and obvious device life reduction. One way to reduce the susceptibility of transparent display to external ambient light is to switch pixels between transparent and opaque to improve the clarity under strong ambient light.

[0038] An embodiment of the present disclosure provides a display substrate, which includes: an electrochromic structure arranged on a substrate, and a light-emitting layer arranged on a side of the electrochromic structure away from the substrate, the electrochromic structure including a first electrode layer and an electrochromic layer, the electrochromic layer being configured to change between transparent and opaque according to a voltage of the first electrode layer and being opaque when the light-emitting layer emits light, an orthographic projection of the electrochromic layer on the substrate overlapping with an orthographic projection of the light-emitting layer on the substrate, and an orthographic projection of the first electrode layer on the substrate overlapping with an orthographic projection of the electrochromic layer on the substrate.

[0039] In the solution provided in this embodiment, the electrochromic layer is opaque when the light-emitting layer emits light, which can block light from the side away from the light-emitting layer, thereby improving the resolution of the display, and there is no need to increase the brightness to suppress ambient light, which can reduce power and increase the life of the display substrate.

[0040] In an exemplary embodiment, the first electrode layer may be a part of an anode that controls the light-emitting layer; or, may be an electrode independent of the anode.

[0041] In an exemplary embodiment, the opacity may be that the electrochromic layer changes to a dark color or black.

[0042] Figure 1 FIG. 1 is a schematic diagram of a display substrate provided by an exemplary embodiment. Figure 1 As shown, the display substrate provided by the embodiment of the present disclosure may include: a substrate 9, a driving structure layer 10 arranged on the substrate 9, a flat layer 11 arranged on the side of the driving structure layer 10 away from the substrate 9, a first electrode layer 12 arranged on the side of the flat layer 11 away from the substrate 9, an electrochromic layer 13 arranged on the side of the first electrode layer 12 away from the substrate 9, a second electrode layer 14 arranged on the side of the electrochromic layer 13 away from the substrate 9, a third electrode layer 15 arranged on the side of the second electrode layer 14 away from the substrate 9, a pixel definition layer 16 arranged on the side of the third electrode layer 15 away from the substrate, and a light-emitting layer 17 arranged on the side of the pixel definition layer 16 away from the substrate, wherein the flat layer 11 is provided with a via hole exposing the driving structure layer 10, the first electrode layer 12 is electrically connected to the driving structure layer 10 through the via hole, the second electrode layer 14 is electrically connected to the first electrode layer 12, the third electrode layer 15 is electrically connected to the second electrode layer 14, and the first electrode layer 12, the second electrode layer 14 and the third electrode layer 15 constitute an anode for controlling the light emission of the light-emitting layer 17. The orthographic projection of the electrochromic layer 13 on the substrate 9 overlaps with the orthographic projection of the light-emitting layer 17 on the substrate 9, and the orthographic projection of the first electrode layer 12 on the substrate 9 overlaps with the orthographic projection of the electrochromic layer 13 on the substrate 9. The first electrode layer 12 and the electrochromic layer 13 constitute an electrochromic structure, and the electrochromic layer 13 changes color between transparent and opaque under the voltage control of the first electrode layer 12, and the electrochromic layer 13 is opaque when the light-emitting layer 17 emits light.

[0043] In the solution provided by this embodiment, the first electrode layer 12 is a part of the anode of the light-emitting layer 17. When controlling the light-emitting layer to emit light, the electrochromic layer 13 is simultaneously changed to opaque, thereby shielding the light from the substrate side, and improving the display resolution. In the solution provided by this embodiment, there is no need to set a separate electrode for the electrochromic layer, and the same electrode is used as the light-emitting layer, and the two are synchronized. When the light-emitting layer emits light, the electrochromic layer can be changed to opaque, thereby avoiding the problem of the two being out of sync.

[0044] In an exemplary embodiment, the orthographic projection of the via on the substrate 9 may be located within the orthographic projection of the electrochromic layer 13 on the substrate 9. In the solution provided by this embodiment, the electrochromic layer 13 can cover a relatively large range, block light as much as possible, and improve the display resolution. However, the disclosed embodiments are not limited to this, and the orthographic projection of the electrochromic layer 13 on the substrate 9 may be located outside the orthographic projection of the via on the substrate 9, for example, the orthographic projection of the electrochromic layer 13 on the substrate 9 may surround the orthographic projection of the via on the substrate 9, or the electrochromic layer 13 may be located on the same side of the via. In this solution, the electrochromic layer 13 avoids the via, and the first electrode layer 12 and the second electrode layer 14 can be electrically connected through the via, which makes the process more convenient.

[0045] In an exemplary embodiment, the orthographic projection of the electrochromic layer 13 on the substrate 9 is located within the orthographic projection of the first electrode layer 12 on the substrate 9. In this embodiment, the electrochromic layer 13 only blocks the area covered by the first electrode layer 12, that is, blocks the light-emitting area, and does not block the non-light-emitting area, thereby not affecting the transmittance of the display substrate and reducing the impact on the transparent display.

[0046] In an exemplary embodiment, the first electrode layer 12 and the second electrode layer 14 may be electrically connected by overlapping, the orthographic projection of the electrochromic layer 13 on the substrate 9 may be located within the orthographic projection of the first electrode layer 13 on the substrate 9, and the area of ​​the first electrode layer 12 not covered by the electrochromic layer 13 is electrically connected to the second electrode layer 14. On a plane parallel to the substrate 9, the orthographic projection of the area of ​​the first electrode layer 12 not covered by the electrochromic layer 13 may surround the orthographic projection of the electrochromic layer 13.

[0047] In an exemplary embodiment, the display substrate may include a plurality of sub-pixels (one-to-one corresponding to the light-emitting layer), and the electrochromic layer 13 may correspond to the sub-pixels one-to-one; or, one electrochromic layer 13 may correspond to a plurality of sub-pixels. When the electrochromic layer 13 corresponds to the sub-pixels one-to-one, the display resolution may be improved at the sub-pixel level.

[0048] In an exemplary embodiment, the electrochromic layer 13 is made of a material that is non-conductive when in an opaque state. In the solution provided by this embodiment, when the light-emitting layer is turned on, the electrochromic layer becomes opaque and non-conductive, and the use of the electrochromic layer does not cause a rise in local voltage and increase energy consumption. For example, when polyaniline is used to prepare the electrochromic layer, polyaniline has a non-conductive property when it changes color to opaque.

[0049] In an exemplary embodiment, the material of the electrochromic layer includes polyaniline, but the embodiments of the present disclosure are not limited thereto, and other electrochromic materials may be used.

[0050] Polyaniline is a cheap and widely used material. As a high molecular polymer, it has good light absorption properties, and within a certain voltage range, it can achieve continuous and reversible color changes through redox reactions, making it a good electrochromic material. When the voltage changes from -1 volt (V) to 1V, the absorption band of light will move toward the short-wave direction. This blue shift phenomenon will also be accompanied by color changes, yellow-green-blue-purple-brown. The color changes depend on the degree of redox of polyaniline. When the voltage is greater than 1V, aniline appears black because it is in a fully oxidized state. The redox reaction is reversible and has a high cycle life. By taking advantage of the black and opaque properties of polyaniline under high voltage, the structure of the luminous pixel with a black base can be realized, which can block the transmission of the strong light source from the back in the luminous pixel area, thereby increasing the resolution of the display without increasing the brightness to suppress the ambient light.

[0051] In an exemplary embodiment, the material of the first electrode layer 12 and the third electrode layer 15 is, for example, a transparent conductive film, such as indium tin oxide (ITO) and indium zinc oxide (IZO), and the material of the second electrode layer 14 is, for example, silver (Ag).

[0052] In an exemplary embodiment, the driving structure layer 10 includes, for example, a thin film transistor composed of an active layer, a gate electrode, a source electrode, and a drain electrode. The first electrode layer 12 may be electrically connected to the drain electrode through a via hole.

[0053] In an exemplary embodiment, the display substrate may be an OLED display substrate or a quantum dot light emitting diode (QLED) display substrate. The display substrate realizes transparent display by using a transparent anode.

[0054] Figure 2 FIG. 1 is a schematic diagram of a display substrate provided in another embodiment. Figure 2As shown, the display substrate provided in this embodiment may include: a substrate 9, a driving structure layer 10 arranged on the substrate 9, a flat layer 11 arranged on the side of the driving structure layer 10 away from the substrate 9, an electrochromic layer 13 arranged on the side of the flat layer 11 away from the substrate 9, a first electrode layer 12 arranged on the side of the electrochromic layer 13 away from the substrate, a second electrode layer 14 arranged on the side of the first electrode layer 12 away from the substrate 9, a third electrode layer 15 arranged on the side of the second electrode layer 14 away from the substrate 9, a pixel definition layer 16 arranged on the side of the third electrode layer 15 away from the substrate, and a light-emitting layer 17 arranged on the side of the pixel definition layer 16 away from the substrate, wherein the flat layer 11 is provided with a via hole exposing the driving structure layer 10, the first electrode layer 12 is electrically connected to the driving structure layer 10 through the via hole, the second electrode layer 14 is electrically connected to the first electrode layer 12, the third electrode layer 15 is electrically connected to the second electrode layer 14, and the first electrode layer 12, the second electrode layer 14 and the third electrode layer 15 constitute an anode for controlling the light emission of the light-emitting layer 17. The orthographic projection of the electrochromic layer 13 on the substrate 9 overlaps with the orthographic projection of the light-emitting layer 17 on the substrate 9, and the orthographic projection of the first electrode layer 12 on the substrate 9 overlaps with the orthographic projection of the electrochromic layer 13 on the substrate. The first electrode layer 12 and the electrochromic layer 13 constitute an electrochromic structure, and the electrochromic layer 13 changes color between transparent and opaque under the voltage control of the first electrode layer 12, and the electrochromic layer 13 is opaque when the light-emitting layer 17 emits light. The orthographic projection of the electrochromic layer 13 on the substrate 9 can be located outside the orthographic projection of the via hole on the substrate 9.

[0055] In the solution provided in this embodiment, the electrochromic layer 13 changes color to be opaque when the light-emitting layer 17 emits light, thereby shielding the light from the substrate side. The electrochromic layer 13 is arranged on the side of the first electrode layer 12 close to the substrate 9 and avoids the via hole. The absence of the electrochromic layer 13 in the via hole will not affect the resistance in the via hole, thereby avoiding the increase of local resistance and the increase of energy consumption. In addition, compared with the solution in which the electrochromic layer 13 is arranged on the side of the first electrode layer 12 away from the substrate 9, the solution provided in this embodiment has a simpler implementation process.

[0056] In an exemplary embodiment, if Figure 3 As shown, the orthographic projection of the electrochromic layer 13 on the substrate 9 can surround the orthographic projection of the via hole on the substrate 9. In the solution provided in this embodiment, the electrochromic layer 13 can not only avoid the via hole, but also the shielding area of ​​the electrochromic layer 13 becomes larger, which can improve the display resolution.

[0057] Figure 4 Schematic diagram of transparent and opaque states of an electrochromic layer provided by an exemplary embodiment. Figure 4As shown, there are two sub-pixels. When one of the sub-pixels emits light, the electrochromic layer 13 changes color to opaque (for example, to black), and light cannot pass through the sub-pixel, thereby improving the display resolution; when the other sub-pixel does not emit light, the electrochromic layer 13 remains transparent, and light passes through the sub-pixel, thereby maintaining a transparent display.

[0058] Figure 5 FIG. 1 is a schematic diagram of a display substrate plane provided by an exemplary embodiment. Figure 5 As shown, the display substrate provided in this embodiment includes m rows (i1 to im) and n columns (j1 to jn) of sub-pixels, which may include red sub-pixels R, green sub-pixels G and blue sub-pixels B, wherein some sub-pixels emit light, the corresponding electrochromic layer turns black, and the corresponding sub-pixel area presents a black background, so that the front view display effect is not affected by the strong light from the back direction of the high-transmittance display substrate (the side away from the light-emitting layer from the base), thereby achieving high-definition front display, improving the interference of ambient light on the display, improving the display resolution, and realizing sub-pixel level display control.

[0059] Figure 6 The following is a flow chart of a method for preparing a display substrate provided by an embodiment of the present disclosure. Figure 6 As shown, the embodiment of the present disclosure provides a method for preparing a display substrate, comprising:

[0060] Step 601, forming an electrochromic structure on a substrate, the electrochromic structure comprising a first electrode layer and an electrochromic layer, the orthographic projection of the first electrode layer on the substrate overlaps with the orthographic projection of the electrochromic layer on the substrate; the electrochromic layer is configured to change between transparent and opaque according to a voltage of the first electrode layer;

[0061] Step 602, forming a light-emitting layer on the side of the electrochromic structure away from the substrate, wherein the orthographic projection of the electrochromic layer on the substrate overlaps with the orthographic projection of the light-emitting layer on the substrate; and the electrochromic layer is configured to be opaque when the light-emitting layer emits light.

[0062] The method for preparing the display substrate provided in this embodiment prepares an electrochromic structure, and the electrochromic layer is opaque when the light-emitting layer emits light, which can block the light from the side away from the light-emitting layer, thereby improving the resolution of the display, and does not need to increase the brightness to suppress the ambient light, which can reduce the power and increase the life of the display substrate. In addition, the preparation process of this embodiment can be implemented using existing mature preparation equipment, with little improvement on the existing process, and can be well compatible with the existing preparation process, and the process is simple to implement and easy to implement.

[0063] In one exemplary embodiment, forming an electrochromic structure on a substrate includes:

[0064] forming a driving structure layer on a substrate;

[0065] forming a flat layer on a side of the driving structure layer away from the substrate;

[0066] An electrochromic structure is formed on the side of the flat layer away from the substrate.

[0067] In an exemplary embodiment, forming an electrochromic structure on a side of the planar layer away from the substrate includes:

[0068] forming the electrochromic layer on a side of the flat layer away from the substrate;

[0069] The first electrode layer is formed on a side of the electrochromic layer away from the substrate.

[0070] In an exemplary embodiment, forming an electrochromic structure on a side of the planar layer away from the substrate includes:

[0071] forming a first electrode layer on a side of the flat layer away from the substrate;

[0072] forming the electrochromic layer on a side of the first electrode layer away from the substrate;

[0073] A second electrode layer and a third electrode layer are sequentially formed on a side of the electrochromic layer away from the substrate.

[0074] The technical solution of this embodiment is further explained by the preparation process of the substrate shown in this embodiment. The "patterning process" mentioned in this embodiment includes deposition of film layer, coating of photoresist, mask exposure, development, etching, stripping of photoresist and other processes, which is a mature preparation process in the relevant technology. The "photolithography process" mentioned in this embodiment includes coating of film layer, mask exposure and development, which is a mature preparation process in the relevant technology. Deposition can adopt known processes such as sputtering, evaporation, chemical vapor deposition, coating can adopt known coating processes, and etching can adopt known methods, which are not specifically limited here. In the description of this embodiment, it should be understood that "thin film" refers to a thin film made of a certain material on a substrate using a deposition or coating process. If the "thin film" does not require a patterning process or a photolithography process during the entire production process, the "thin film" can also be called a "layer". If the "thin film" also requires a patterning process or a photolithography process during the entire production process, it is called a "thin film" before the patterning process and a "layer" after the patterning process. The "layer" after the patterning process or the photolithography process contains at least one "pattern".

[0075] The method for preparing a display substrate provided by the embodiment of the present disclosure includes:

[0076] A driving structure layer 10 pattern is formed on a substrate 9; the driving structure layer 10 includes an active layer, a gate electrode, a source electrode and a drain electrode; the substrate 9 may be a flexible substrate or a rigid substrate.

[0077] A planar layer film is coated on the driving structure layer, and a pattern of a planar layer 11 covering the driving structure layer is formed by a mask exposure and development photolithography process, wherein a via hole is provided in the planar layer 11 to expose the drain electrode. The planar layer film can be made of organic material.

[0078] Depositing a transparent conductive film, patterning the transparent conductive film through a patterning process to form a first electrode layer 12 pattern, wherein the first electrode layer 12 is connected to the drain electrode through a via hole;

[0079] Coating a polyaniline film, and forming an electrochromic layer 13 pattern through a photolithography process of mask exposure and development;

[0080] A first metal film is deposited and patterned through a patterning process to form a second electrode layer 14 pattern. The second electrode layer 14 is electrically connected to the first electrode layer 12. The first metal film is, for example, silver (Ag).

[0081] Depositing a transparent conductive film, and patterning the transparent conductive film through a patterning process to form a pattern of the third electrode layer 15;

[0082] A pixel definition film is coated on the substrate with the aforementioned pattern, and a pattern of the pixel definition layer 16 is formed by a photolithography process; the pixel definition film can be made of polyimide, acrylic or polyethylene terephthalate.

[0083] On the substrate formed with the above pattern, organic light-emitting materials and cathode metals are sequentially deposited to form a light-emitting layer 17 and a cathode pattern, such as Figure 1 As shown (cathode not shown).

[0084] The present disclosure also provides a display device, including the display substrate of the above embodiment. The display device can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, etc.

[0085] Although the embodiments disclosed in the present invention are as above, the contents described are only embodiments adopted to facilitate understanding of the present invention and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A display substrate, characterized in that: The display substrate includes: an electrochromic structure arranged on a substrate, a light-emitting layer arranged on a side of the electrochromic structure away from the substrate, the electrochromic structure including a first electrode layer and an electrochromic layer, the electrochromic layer being arranged on a side of the first electrode layer close to the substrate, the electrochromic layer being arranged to change between transparent and opaque according to a voltage of the first electrode layer and being opaque when the light-emitting layer emits light, and when the light-emitting layer is turned on, the electrochromic layer becomes opaque and non-conductive, an orthographic projection of the electrochromic layer on the substrate overlaps with an orthographic projection of the light-emitting layer on the substrate, and an orthographic projection of the first electrode layer on the substrate overlaps with an orthographic projection of the electrochromic layer on the substrate.

2. The display substrate according to claim 1, characterized in that: The first electrode layer is arranged on a side of the electrochromic layer away from the substrate, and the first electrode layer is a part of the anode for controlling the light emission of the light emitting layer.

3. The display substrate according to claim 2, characterized in that: The display substrate also includes a driving structure layer and a flat layer sequentially arranged between the base and the electrochromic structure, the flat layer is provided with a via hole exposing the driving structure layer, the first electrode layer is electrically connected to the driving structure layer through the via hole, and the orthographic projection of the electrochromic layer on the base is located outside the orthographic projection of the via hole on the base.

4. The display substrate according to any one of claims 1 to 3, characterized in that: The orthographic projection of the electrochromic layer on the substrate is located within the orthographic projection of the first electrode layer on the substrate.

5. The display substrate according to any one of claims 1 to 3, characterized in that: The material of the electrochromic layer includes polyaniline.

6. A display device, characterized in that: The display device comprises the display substrate according to any one of claims 1 to 5.

7. A method for preparing a display substrate, characterized in that: include: An electrochromic structure is formed on a substrate, the electrochromic structure comprising a first electrode layer and an electrochromic layer, the electrochromic layer is formed on a side of the first electrode layer close to the substrate, and an orthographic projection of the first electrode layer on the substrate overlaps with an orthographic projection of the electrochromic layer on the substrate; the electrochromic layer is configured to change between transparent and opaque according to a voltage of the first electrode layer; A light-emitting layer is formed on the side of the electrochromic structure away from the substrate, and the orthographic projection of the electrochromic layer on the substrate overlaps with the orthographic projection of the light-emitting layer on the substrate; the electrochromic layer is configured to be opaque when the light-emitting layer emits light, and when the light-emitting layer is turned on, the electrochromic layer becomes opaque and non-conductive.

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