Display panel, preparation method thereof and display device

Abstract

Embodiments of the present application provide a display panel, a preparation method thereof and a display device. The display panel comprises a substrate, a pixel light-emitting layer, an encapsulation layer and a photochromic layer. The pixel light-emitting layer is arranged on the substrate, the photochromic layer is arranged on a side of the pixel light-emitting layer away from the substrate, and the encapsulation layer is arranged between the pixel light-emitting layer and the photochromic layer. A plurality of first light-emitting units are arranged in the pixel light-emitting layer, and the first light-emitting units are connected with a first driving circuit on the substrate. The first driving circuit is used to drive the first light-emitting units to emit write-in light. An area on the photochromic layer irradiated by the write-in light changes in color to form a color-developed area and remains unchanged. The color of the color-developed area is different from that of an original color area on the photochromic layer which is not irradiated by the write-in light. The color of the color-developed area changes to the same as that of the original color area after being irradiated by erase light, and the color of the color-developed area remains unchanged before being irradiated by the erase light.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display panel, its manufacturing method, and a display device. Background Technology

[0002] Organic light-emitting diodes (OLEDs) and flat panel displays based on light-emitting diodes (LEDs) are widely used in various consumer electronics products such as mobile phones, televisions, laptops, and desktop computers due to their advantages such as high image quality, energy saving, thin body, and wide range of applications, becoming the mainstream of display devices.

[0003] However, the power consumption of current display devices such as OLEDs needs to be reduced. Summary of the Invention

[0004] In view of this, embodiments of this application provide a new display panel to at least partially solve the above-mentioned problems.

[0005] According to a first aspect of the present application, a display panel is provided, comprising: a substrate, a pixel light-emitting layer, an encapsulation layer, and a photochromic layer; the pixel light-emitting layer is disposed on the substrate, the photochromic layer is disposed on the side of the pixel light-emitting layer opposite to the substrate, and the encapsulation layer is disposed between the pixel light-emitting layer and the photochromic layer; a plurality of first light-emitting units are disposed in the pixel light-emitting layer, and the first light-emitting units are connected to a first driving circuit on the substrate; the first driving circuit is used to drive the first light-emitting units to emit write light; the area on the photochromic layer irradiated by the write light undergoes a color change to form a color-developing area and remains thereon, the color of the color-developing area is different from the color of the original color area on the photochromic layer that is not irradiated by the write light, wherein the color of the color-developing area changes to the same color as the original color area after being irradiated by erasure light, and the color of the color-developing area remains unchanged before being irradiated by the erasure light.

[0006] In some alternative embodiments, the display panel further includes a second light-emitting unit for emitting erasing light, the second light-emitting unit being disposed on the side of the photochromic layer near the substrate.

[0007] In some alternative embodiments, the display panel includes a plurality of second light-emitting units located in the pixel light-emitting layer; and the orthographic projection of each first light-emitting unit on the photochromic layer is adjacent to the orthographic projection of at least one second light-emitting unit on the photochromic layer.

[0008] In some alternative embodiments, the second light-emitting unit is disposed on the side of the first light-emitting unit away from the substrate, and at least a portion of the orthographic projection of the second light-emitting unit on the photochromic layer intersects with the orthographic projection of the first light-emitting unit on the photochromic layer;

[0009] In some alternative embodiments, along the thickness direction of the display panel, the second light-emitting unit is spaced apart from the first light-emitting unit, and the orthographic projection of the first light-emitting unit on the photochromic layer is located within the orthographic projection of the second light-emitting unit on the photochromic layer.

[0010] In some alternative embodiments, the second light-emitting unit is disposed between the pixel light-emitting layer and the photochromic layer; and the encapsulation layer includes a first encapsulation layer and a second encapsulation layer, wherein the first encapsulation layer is disposed between the pixel light-emitting layer and the second light-emitting unit, and the second encapsulation layer is disposed between the second light-emitting unit and the photochromic layer.

[0011] In some alternative embodiments, the encapsulation layer further includes a first inkjet-printed encapsulation layer; the first inkjet-printed encapsulation layer is located between the first encapsulation layer and the second light-emitting unit, or the first inkjet-printed encapsulation layer is located between the second light-emitting unit and the second encapsulation layer.

[0012] In some optional embodiments, the encapsulation layer further includes a second inkjet-printed encapsulation layer and a third encapsulation layer; when the first inkjet-printed encapsulation layer is located between the first encapsulation layer and the second light-emitting unit, the second inkjet-printed encapsulation layer is disposed on the side of the second encapsulation layer close to the photochromic layer, and the third encapsulation layer is disposed between the second inkjet-printed encapsulation layer and the photochromic layer.

[0013] In some alternative embodiments, the second light-emitting unit is disposed on the side of the first light-emitting unit away from the substrate, the second light-emitting unit is adjacent to the first light-emitting unit, and the orthographic projection of the second light-emitting unit on the photochromic layer coincides with the orthographic projection of the first light-emitting unit on the photochromic layer.

[0014] In some alternative embodiments, the display panel further includes a third light-emitting unit; the third light-emitting unit is used to emit the erasing light toward the photochromic layer on the side of the photochromic layer opposite to the substrate.

[0015] In some optional embodiments, the photochromic layer includes a plurality of sub-color-changing layers stacked along the thickness direction of the display panel, and the color-displaying area on the photochromic layer includes a sub-color-displaying area on the sub-color-changing layer; the first light-emitting unit includes a plurality of first sub-light-emitting units, and the first sub-light-emitting units correspond one-to-one with the sub-color-changing layers; the first sub-light-emitting units are used to emit the write light, and the wavelength of the write light emitted by each first sub-light-emitting unit is different; the area on the sub-color-changing layer irradiated by the write light of the corresponding first sub-light-emitting unit undergoes a color change to form the sub-color-displaying area, and the color of the sub-color-displaying area formed on each sub-color-changing layer is different.

[0016] According to a second aspect of the present application, a method for manufacturing a display panel is provided. The method includes: forming a pixel light-emitting layer on one side of a substrate; forming an encapsulation layer on the side of the pixel light-emitting layer opposite to the substrate; forming a photochromic layer on the side of the encapsulation layer opposite to the pixel light-emitting layer; wherein a plurality of first light-emitting units are disposed in the pixel light-emitting layer, and the first light-emitting units are connected to a first driving circuit on the substrate; the first driving circuit is used to drive the first light-emitting units to emit write light; the area on the photochromic layer irradiated by the write light undergoes a color change to form a color-developing area and remains thereon, the color of the color-developing area is different from the color of the original color area on the photochromic layer that is not irradiated by the write light, the color of the color-developing area changes to the same color as the original color area after being irradiated by erasure light, and the color of the color-developing area remains unchanged before being irradiated by the erasure light.

[0017] In some alternative embodiments, a second light-emitting unit is formed on one side of the substrate where the pixel light-emitting layer is disposed.

[0018] In some optional embodiments, forming a second light-emitting unit on one side of the substrate where the pixel light-emitting layer is disposed includes: forming a plurality of second light-emitting units on the pixel light-emitting layer; wherein the orthographic projection of each first light-emitting unit on the photochromic layer is adjacent to the orthographic projection of at least one second light-emitting unit on the photochromic layer.

[0019] In some optional embodiments, forming a second light-emitting unit on the side of the substrate where the pixel light-emitting layer is disposed includes: forming the second light-emitting unit on the side of the first light-emitting unit away from the substrate; wherein at least a portion of the orthographic projection of the second light-emitting unit onto the photochromic layer intersects with the orthographic projection of the first light-emitting unit onto the photochromic layer;

[0020] In some optional embodiments, forming an encapsulation layer on the side of the pixel light-emitting layer opposite to the substrate includes: forming a first encapsulation layer on the side of the pixel light-emitting layer opposite to the substrate; forming a second light-emitting unit on the side of the first light-emitting unit opposite to the substrate includes: forming a second light-emitting unit on the side of the first encapsulation layer opposite to the pixel light-emitting layer; forming an encapsulation layer on the side of the pixel light-emitting layer opposite to the substrate further includes: forming a second encapsulation layer on the side of the second light-emitting unit opposite to the first encapsulation layer;

[0021] In some optional embodiments, the orthographic projection of the first light-emitting unit onto the photochromic layer is located within the orthographic projection of the second light-emitting unit onto the photochromic layer;

[0022] In some optional embodiments, forming an encapsulation layer on the side of the pixel light-emitting layer away from the substrate further includes: forming a first inkjet-printed encapsulation layer on the side of the first encapsulation layer away from the pixel light-emitting layer, such that the first inkjet-printed encapsulation layer is located between the first encapsulation layer and the second light-emitting unit; or forming a first inkjet-printed encapsulation layer on the side of the second light-emitting unit away from the first encapsulation layer, such that the first inkjet-printed encapsulation layer is located between the second light-emitting unit and the second encapsulation layer.

[0023] In some optional embodiments, forming an encapsulation layer on the side of the pixel light-emitting layer away from the substrate further includes: forming a first inkjet-printed encapsulation layer on the side of the first encapsulation layer away from the pixel light-emitting layer, forming a second inkjet-printed encapsulation layer on the side of the second encapsulation layer away from the second light-emitting unit, and forming a third encapsulation layer on the side of the second inkjet-printed encapsulation layer away from the second encapsulation layer, such that the third encapsulation layer is located between the second inkjet-printed encapsulation layer and the photochromic layer.

[0024] According to a third aspect of the embodiments of this application, a display device is provided, including the display panel described in the above embodiments.

[0025] In this embodiment, the display panel includes a substrate, a pixel light-emitting layer, an encapsulation layer, and a photochromic layer. The pixel light-emitting layer is disposed on the substrate, the photochromic layer is disposed on the side of the pixel light-emitting layer facing away from the substrate, and the encapsulation layer is disposed between the pixel light-emitting layer and the photochromic layer. The pixel light-emitting layer has a plurality of first light-emitting units, which are connected to a first driving circuit on the substrate. The first driving circuit drives the first light-emitting units to emit write light. The area on the photochromic layer irradiated by the write light changes color to form a color-developing area. The color of the color-developing area is different from the color of the original color area on the photochromic layer that is not irradiated by the write light. The color of the color-developing area changes to the same color as the original color area after being irradiated by erasure light, and the color of the color-developing area remains unchanged before being irradiated by erasure light. By controlling the emission of write light from several first light-emitting units, a color-developing area corresponding to a predetermined pattern composed of several first light-emitting units can be formed on the photochromic layer, thereby realizing the display of the predetermined pattern. After forming a display area with a predetermined pattern on the photochromic layer, the first light-emitting unit can be turned off. The predetermined pattern can be displayed simply by reflecting ambient light through the display area, without consuming electrical energy, which can significantly reduce the power consumption of the display panel. Especially in scenarios where the predetermined pattern needs to be continuously displayed, using a continuously existing display area to display the predetermined pattern can greatly save power, so that the average power consumption of the display panel can be reduced to near zero. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a cross-sectional structural diagram of a portion of a display panel provided as an optional embodiment of this application.

[0028] Figure 2 Provided for optional embodiments of this application Figure 1 The display panel contains a schematic diagram of writing light illumination.

[0029] Figure 3 Provided for optional embodiments of this application Figure 1 The display panel contains a schematic diagram of the erasing light illumination.

[0030] Figure 4 This is a cross-sectional structural diagram of a first light-emitting unit provided as an optional embodiment of this application.

[0031] Figure 5 This is a cross-sectional structural diagram of a portion of a display panel provided as an optional embodiment of this application.

[0032] Figure 6 Provided for optional embodiments of this application Figure 5 The display panel contains a schematic diagram of writing light illumination.

[0033] Figure 7 Provided for optional embodiments of this application Figure 5 The display panel contains a schematic diagram of the erasing light illumination.

[0034] Figure 8 This is a schematic cross-sectional view of an encapsulation layer provided as an optional embodiment of this application.

[0035] Figure 9 This is a schematic cross-sectional view of another encapsulation layer provided as an optional embodiment of this application.

[0036] Figure 10 This is a cross-sectional view of another encapsulation layer provided as an optional embodiment of this application.

[0037] Figure 11 This is a cross-sectional structural diagram of a portion of a display panel provided as an optional embodiment of this application.

[0038] Figure 12 Provided for optional embodiments of this application Figure 11 The display panel contains a schematic diagram of writing light illumination.

[0039] Figure 13 Provided for optional embodiments of this application Figure 11 The display panel contains a schematic diagram of the erasing light illumination.

[0040] Figure 14 This is a schematic flowchart of a method for manufacturing a display panel, provided as an optional embodiment of this application.

[0041] Figure label:

[0042] 100. Display panel; 110. Substrate; 111. First driving circuit; 112. Second driving circuit; 120. Pixel light-emitting layer; 130. Encapsulation layer; 131. First encapsulation layer; 132. Second encapsulation layer; 133. Third encapsulation layer; 134. First inkjet printed encapsulation layer; 135. Second inkjet printed encapsulation layer; 140. Photochromic layer; 141. Color display area; 150. First light-emitting unit; 151. First anode layer; 152. First hole injection layer; 153. First hole transport layer; 154. First light-emitting layer; 155. First electron transport layer; 156. First electron injection layer; 157. First cathode layer; 158. Write light; 160. Second light-emitting unit; 161. Second anode layer; 162. Second light-emitting layer; 163. Erasure light. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.

[0044] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a” and “the” as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0045] It should be understood that although the terms first, second, third, etc., may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0046] According to a first aspect of the embodiments of this application, a display panel is provided to solve the above-mentioned problems.

[0047] Figure 1-3 A schematic diagram of the structure of a display panel 100 is shown. For example... Figure 1-3 As shown, the display panel 100 includes: a substrate 110, a pixel light-emitting layer 120, an encapsulation layer 130, and a photochromic layer 140.

[0048] A pixel light-emitting layer 120 is disposed on a substrate 110, a photochromic layer 140 is disposed on the side of the pixel light-emitting layer 120 facing away from the substrate 110, and an encapsulation layer 130 is disposed between the pixel light-emitting layer 120 and the photochromic layer 140. The encapsulation layer 130 may include a transparent insulating material, which can be used to encapsulate the pixel light-emitting layer 120 and isolate the pixel light-emitting layer 120 and the photochromic layer 140.

[0049] The pixel light-emitting layer 120 is provided with a plurality of first light-emitting units 150, and the first light-emitting units 150 are connected to a first driving circuit 111 on the substrate 110; the first driving circuit 111 is used to drive the first light-emitting units 150 to emit write light. The first light-emitting units 150 can be pixel units of OLED or Micro-LED, so that each first light-emitting unit 150 can be controlled to emit light individually, thereby flexibly controlling the color change on the photochromic layer 140.

[0050] For example, such as Figure 4 As shown, the first light-emitting unit 150 may specifically include a first anode layer 151, a first hole injection layer 152, a first hole transport layer 153, a first light-emitting layer 154, a first electron transport layer 155, a first electron injection layer 156, and a first cathode layer 157, etc. The first anode layer 151 is adjacent to the substrate 110 and connected to the first driving circuit 111 on the substrate 110; the first hole injection layer 152 may be located on the side of the anode away from the substrate 110; the first hole transport layer 153 may be located on the side of the first hole injection layer 152 away from the substrate 110; the first light-emitting layer 154 may be located on the side of the first hole transport layer 153 away from the substrate 110; the first electron transport layer 155 may be located on the side of the first light-emitting layer 154 away from the substrate 110; the first electron injection layer 156 may be located on the side of the first electron transport layer 155 away from the substrate 110; and the first cathode layer 157 may be located on the side of the first electron injection layer 156 away from the substrate 110. Figure 2 As shown, the driving circuit on the substrate 110 can emit write light 158 ​​from the first light-emitting layer 154 between the first anode layer 151 and the first cathode layer 157 of the first light-emitting unit 150 by applying a driving signal to the first anode layer 151 of the first light-emitting unit 150.

[0051] like Figure 2 As shown, the area on the photochromic layer 140 illuminated by the written light 158 ​​undergoes a color change, forming a color-developing area 141, which remains unchanged. The color of the color-developing area 141 differs from the color of the original color area on the photochromic layer 140 not illuminated by the written light 158, such as... Figure 3 As shown, the color of the color-developing area 141 changes to the same color as the original color area after being irradiated by the erasure light 163, and the color of the color-developing area 141 remains unchanged before being irradiated by the erasure light. Optionally, in some other embodiments, the color of the color-developing area 141 may gradually fade before being irradiated by the erasure light 163, so as to reduce the performance requirements of the photochromic layer 140.

[0052] It should be understood that the primary color area refers to the area on the photochromic layer 140 that has not been written with light to change its color. The color of the primary color area can be colorless and transparent or other colors.

[0053] The photochromic layer 140 may include a photochromic material, which typically corresponds to two specific wavelengths / colors of light that can change its color. Specifically, the photochromic material can change color under irradiation with a first specific wavelength of light, from the first color to the second color, and under irradiation with a second specific wavelength of light, it can change color back to the first color. The first and second specific wavelengths of light can be used as write light and erase light, respectively. By controlling the wavelength / color of the light emitted by the first light-emitting unit, the first light-emitting unit can emit write light; by controlling the wavelength / color of the light emitted by the second or third light-emitting unit below, the second or third light-emitting unit can emit erase light. For example, the photochromic layer may include a photochromic material with a first specific wavelength of light being blue light and a second specific wavelength of light being green light. The photochromic material changes from colorless and transparent to purple under blue light irradiation, and the photochromic material that has turned purple can change its color from purple to colorless and transparent under green light irradiation.

[0054] In addition, the photochromic material in the photochromic layer 140 can be an organic polymer or small molecule material, such as diarylethene (DAE), or an inorganic material that can form a completely solid film for fabricating the photochromic layer 140. In an optional embodiment, the writing light emitted by the first light-emitting unit 150 can be blue light, and the photochromic layer 140 can change from colorless and transparent to purple under blue light irradiation, forming a purple color-displaying area. The corresponding erasure light is green light, and the purple color-displaying area can change from purple to colorless and transparent under green light irradiation. By selecting a suitable photochromic material, the color of the color-displaying area on the photochromic layer 140 can remain unchanged before being irradiated by the erasure light. The color-displaying area can display color by passively reflecting ambient light and maintain good display performance even under strong ambient light conditions.

[0055] It should be noted that a predetermined time can be set according to the time required for the photochromic layer 140 to absorb the writing light and change color. When the time for the first light-emitting unit 150 to emit the writing light reaches the predetermined time, the first light-emitting unit 150 is turned off, thereby saving power as much as possible and reducing the power consumption of the display panel 100.

[0056] As a feasible implementation, some or all of the first light-emitting units 150 can be controlled to emit write light according to a predetermined pattern, so that the color-forming areas formed on the photochromic layer 140 constitute the predetermined pattern. For example, the required first light-emitting units 150 for forming the predetermined pattern can be determined according to the predetermined pattern, and the required first light-emitting units 150 can be controlled to emit write light toward the photochromic layer 140, so that a display area with the predetermined pattern is formed on the photochromic layer 140. As long as erasure light is not emitted toward the display area, the display area can continue to exist, thereby continuously displaying the predetermined pattern.

[0057] In this embodiment, the display panel 100 includes a substrate 110, a pixel light-emitting layer 120, an encapsulation layer 130, and a photochromic layer 140. The pixel light-emitting layer 120 is disposed on the substrate 110, the photochromic layer 140 is disposed on the side of the pixel light-emitting layer 120 facing away from the substrate 110, and the encapsulation layer 130 is disposed between the pixel light-emitting layer 120 and the photochromic layer 140. The pixel light-emitting layer 120 has a plurality of first light-emitting units 150, and the first light-emitting units 150 are connected to a first driving circuit 111 on the substrate 110; the first driving circuit 111 is used to drive the first light-emitting units 150 to emit write light. The area on the photochromic layer 140 illuminated by the written light changes color to form a color-developing area. The color of the color-developing area differs from the color of the original color area on the photochromic layer 140 not illuminated by the written light. After being illuminated by the erasure light, the color of the color-developing area changes to match the color of the original color area, while its color remains unchanged before being illuminated by the erasure light. By controlling the emission of written light from several first light-emitting units 150, a color-developing area corresponding to a predetermined pattern composed of several first light-emitting units 150 can be formed on the photochromic layer 140, thereby realizing the display of the predetermined pattern. After the display area of ​​the predetermined pattern is formed on the photochromic layer 140, the first light-emitting units 150 can be turned off. The predetermined pattern can be displayed simply by reflecting ambient light through the display area, without consuming electrical energy, which can significantly reduce the power consumption of the display panel 100. Especially in scenarios where the predetermined pattern needs to be continuously displayed, using a continuously existing display area to display the predetermined pattern can greatly save power, allowing the average power consumption of the display panel 100 to be reduced to near zero.

[0058] To reduce the power consumption of display devices, some display devices use electronic paper to make the display panel 100. Although electronic paper can reduce the power consumption of display devices to a certain extent, due to the mechanism of electronic ink materials and control methods, it has problems such as slow refresh rate and poor reliability.

[0059] like Figure 1-3 or Figure 5-7As shown, in some optional embodiments, the display panel 100 further includes a second light-emitting unit 160 for emitting erasing light, the second light-emitting unit 160 being disposed on the side of the photochromic layer 140 near the substrate 110.

[0060] The second light-emitting unit 160 can emit erasing light, causing the color-developing area on the photochromic layer 140 to change color to match the original color area under the illumination of the erasing light. This eliminates the pattern displayed on the photochromic layer 140 using the color-developing area, thus preparing for the next pattern writing. Since the response time of the photochromic material to writing and erasing light can reach the millisecond level, the photochromic layer 140 can quickly refresh and display patterns under the action of writing and erasing light. In addition, in this embodiment, the first light-emitting unit 150, the second light-emitting unit 160, and the photochromic layer 140 can all be made of stable solid materials, which have good reliability and can solve the shortcomings of liquid electronic ink in electronic paper, such as easy leakage and poor reliability.

[0061] like Figure 1-3 As shown, in some optional embodiments, the display panel 100 includes a plurality of second light-emitting units 160, which are located in the pixel light-emitting layer 120; and the orthographic projection of each first light-emitting unit 150 on the photochromic layer 140 is adjacent to the orthographic projection of at least one second light-emitting unit 160 on the photochromic layer 140.

[0062] For example, each first light-emitting unit 150 can correspond one-to-one with a second light-emitting unit 160, and the orthographic projection of each first light-emitting unit 150 on the photochromic layer 140 is adjacent to the orthographic projection of the corresponding second light-emitting unit 160 on the photochromic layer 140. Alternatively, for each first light-emitting unit 150, multiple second light-emitting units 160 can be arranged around the first light-emitting unit 150, and the orthographic projection of each first light-emitting unit 150 on the photochromic layer 140 is adjacent to the orthographic projection of the multiple second light-emitting units 160 corresponding to the first light-emitting unit 150 on the photochromic layer 140.

[0063] Similar to the first light-emitting unit 150, the second light-emitting unit 160 may include a second anode layer 161, a second hole injection layer, a second hole transport layer, a second light-emitting layer, a second electron transport layer, a second electron injection layer, a second cathode layer, etc., arranged sequentially, which will not be described in detail here. Figure 1-3 As shown, the second anode layer 161 is connected to the second driving circuit 112 on the substrate 110, thereby driving the second light-emitting unit 160 to emit erasing light through the second driving circuit 112. Figure 1-3As shown, the second light-emitting unit 160 can share the same cathode layer as the first light-emitting unit 150, that is, the first cathode layer 157 can also serve as the second cathode layer to simplify the circuit structure. The second driving circuit 112 on the substrate 110 can apply a driving signal to the second anode layer 161 of the second light-emitting unit 160, causing the second light-emitting layer between the second anode layer 161 and the second cathode layer of the second light-emitting unit 160 to emit erasing light. Figure 3 As shown, after the second light-emitting layer 162 emits erasing light 163 to irradiate the photochromic layer 140, the color of the color-changing area irradiated by the erasing light 163 can be changed to be the same as the original color area.

[0064] In this embodiment, the display panel 100 includes a plurality of second light-emitting units 160, which are located in the pixel light-emitting layer 120. Furthermore, the orthographic projection of each first light-emitting unit 150 onto the photochromic layer 140 is adjacent to the orthographic projection of at least one second light-emitting unit 160 onto the photochromic layer 140. For a color display area formed based on the write light emitted by a certain first light-emitting unit 150, since the orthographic projection of the first light-emitting unit 150 onto the photochromic layer 140 is adjacent to the orthographic projection of at least one second light-emitting unit 160 onto the photochromic layer 140, the color change of the color display area can be made the same as that of the original color area by emitting erasure light from at least one second light-emitting unit 160. This allows for targeted erasure of the color of any display area, restoring the color display area to the original color area, thus making the control of the display area on the photochromic layer 140 more flexible.

[0065] In some optional embodiments, the second light-emitting unit 160 is disposed on the side of the first light-emitting unit 150 away from the substrate, and at least a portion of the orthographic projection of the second light-emitting unit 160 on the photochromic layer 140 intersects with the orthographic projection of the first light-emitting unit 150 on the photochromic layer 140, so that when the second light-emitting unit 160 emits erasing light 163 toward the photochromic layer 140, at least a portion of the erasing light 163 can be concentrated on the color-producing area to improve the efficiency of eliminating the color-producing area.

[0066] In some alternative embodiments, along the thickness direction of the display panel 100, the second light-emitting unit 160 is adjacent to the first light-emitting unit 150, and the orthographic projection of the second light-emitting unit 160 on the photochromic layer 140 coincides with the orthographic projection of the first light-emitting unit 150 on the photochromic layer 140.

[0067] As a feasible implementation, similar to the first light-emitting unit 150, the second light-emitting unit 160 may include a second anode layer, a second hole injection layer, a second hole transport layer, a second light-emitting layer, a second electron transport layer, a second electron injection layer, and a second cathode layer arranged sequentially. A second driving circuit corresponding to the second light-emitting unit 160 may be disposed on the substrate 110. Vias may be provided in the first light-emitting unit 150. The second anode layer of each second light-emitting unit 160 can be connected to a second driving circuit through the vias in the first light-emitting unit 150, so that the second light-emitting unit 160 can be driven by the second driving circuit to emit erasing light.

[0068] As another feasible implementation, the second light-emitting unit 160 may include a second light-emitting layer, which is located between the first light-emitting layer and the first electron transport layer in the first light-emitting unit 150. That is, the second light-emitting unit 160 and the first light-emitting unit 150 share the first anode layer 151, the first hole injection layer 152, the first hole transport layer 153, the first electron transport layer 155, the first electron injection layer 156, and the first cathode layer 157. The light-emitting voltage or light-emitting current of the first light-emitting unit 150 and the second light-emitting unit 160 can be set to be different. By controlling the voltage or current between the first anode layer 151 and the first cathode layer 157, the light emission of one of the first light-emitting layer and the second light-emitting layer can be controlled, that is, the light emission of one of the first light-emitting unit 150 and the second light-emitting unit 160 can be controlled.

[0069] In this embodiment, by setting the second light-emitting unit 160 adjacent to the first light-emitting unit 150 along the thickness direction of the display panel 100, and the orthographic projection of the second light-emitting unit 160 on the photochromic layer 140 coincides with the orthographic projection of the first light-emitting unit 150 on the photochromic layer 140, the trajectory of the erasure light 163 irradiated by the second light-emitting unit 160 onto the photochromic layer 140 can be similar to the trajectory of the write light 158 ​​irradiated by the first light-emitting unit 150 onto the photochromic layer 140, thereby enabling the erasure light 163 to more accurately irradiate the color display area and avoid wasting the erasure light 163.

[0070] It should be noted that the second light-emitting unit 160 can be made of a transparent or translucent material, such as indium oxide, so that the write light 158 ​​emitted by the first light-emitting unit 150 can pass through the second light-emitting unit 160 and illuminate the photochromic layer 140. The specific structural composition of the second light-emitting unit 160 can be similar to that of the first light-emitting unit 150, and will not be described in detail here.

[0071] like Figure 5-7As shown, in some optional embodiments, the second light-emitting unit 160 is disposed between the pixel light-emitting layer 120 and the photochromic layer 140; and the encapsulation layer 130 includes a first encapsulation layer 131 and a second encapsulation layer 132, the first encapsulation layer 131 being disposed between the pixel light-emitting layer 120 and the second light-emitting unit 160, and the second encapsulation layer 132 being disposed between the second light-emitting unit 160 and the photochromic layer 140.

[0072] For example, such as Figure 6 As shown, the write light 158 ​​emitted by the first light-emitting unit 150 can pass through the second light-emitting unit 160 and illuminate the photochromic layer 140, thereby forming a color-developing region 141 on the photochromic layer 140. Figure 7 As shown, the erasing light 163 emitted by the second light-emitting unit 160 can pass through and irradiate the photochromic layer 140, causing the color of the color display area 141 on the photochromic layer 140 to change to be the same as the original color area.

[0073] The first encapsulation layer 131 and the second encapsulation layer 132 can be transparent CVD (chemical vapor deposition) encapsulation layers, that is, encapsulation layers formed by CVD process, and their materials can be transparent insulating materials. The light-emitting layer and other structures in the second light-emitting unit 160 can be made of transparent materials so that the write light emitted by the first light-emitting unit 150 can pass through the second light-emitting unit 160 and irradiate the photochromic layer 140.

[0074] By placing the second light-emitting unit 160 between the pixel light-emitting layer 120 and the photochromic layer 140, the space between the pixel light-emitting layer 120 and the photochromic layer 140 can be fully utilized. Furthermore, by placing the first encapsulation layer 131 between the pixel light-emitting layer 120 and the second light-emitting unit 160, and the second encapsulation layer 132 between the second light-emitting unit 160 and the photochromic layer 140, a certain distance can exist between the second light-emitting unit 160 and both the pixel light-emitting layer 120 and the photochromic layer 140. This reduces the limitations imposed by the pixel light-emitting layer 120 and the photochromic layer 140 on the installation of the second light-emitting unit 160, facilitating its installation.

[0075] like Figures 5-7 As shown, in some optional embodiments, the orthographic projection of the first light-emitting unit 150 onto the photochromic layer 140 lies within the orthographic projection of the second light-emitting unit 160 onto the photochromic layer 140.

[0076] After the first light-emitting unit 150 emits writing light to form a color-developing area on the photochromic layer 140, the second light-emitting unit 160 can emit erasing light. By setting the orthographic projection of the first light-emitting unit 150 on the photochromic layer 140 to be within the orthographic projection of the second light-emitting unit 160 on the photochromic layer 140, the second light-emitting unit 160 can have a larger projection range on the photochromic layer 140 compared to the first light-emitting unit 150. This facilitates the erasing light emitted by the second light-emitting unit 160 to cover the aforementioned color-developing area on the photochromic layer 140, ensuring that the color of any color-developing area on the photochromic layer 140 can be changed to match the color of the original color area by the erasing light from the second light-emitting unit 160, thus avoiding any residual color in the color-developing area when erasing it with light.

[0077] In some alternative embodiments, the encapsulation layer 130 further includes a first inkjet-printed encapsulation layer 134; such as Figure 8 As shown, the first inkjet-printed encapsulation layer 134 is located between the first encapsulation layer 131 and the second light-emitting unit 160; or, as... Figure 9 As shown, the first inkjet-printed encapsulation layer 134 is located between the second light-emitting unit 160 and the second encapsulation layer 132.

[0078] It should be understood that inkjet printed encapsulation layer 130 is an encapsulation layer made by inkjet printing. The first inkjet printed encapsulation layer 134 and the lower second inkjet printed encapsulation layer 135 can be made of transparent materials to avoid blocking the writing light or erasing light.

[0079] By setting a first inkjet-printed encapsulation layer 134 between the first encapsulation layer 131 and the second light-emitting unit 160, or between the second light-emitting unit 160 and the second encapsulation layer 132, leveling can be performed on the side of the second light-emitting unit 160 near the first encapsulation layer 131, or on the side of the second light-emitting unit 160 near the second encapsulation layer 132. This avoids the setting of the second light-emitting unit 160 affecting the flatness of the second encapsulation layer 132 and the photochromic layer 140, and also helps to make the setting of the second encapsulation layer 132 and the photochromic layer 140 flatter.

[0080] In some optional embodiments, the encapsulation layer 130 further includes a second inkjet-printed encapsulation layer 135 and a third encapsulation layer 133. The third encapsulation layer 133 and the second encapsulation layer 132 can be transparent CVD encapsulation layers. Figure 10As shown, when the first inkjet printed encapsulation layer 134 is located between the first encapsulation layer 131 and the second light-emitting unit 160, the second inkjet printed encapsulation layer 135 is disposed on the side of the second encapsulation layer 132 near the photochromic layer 140, and the third encapsulation layer 133 is disposed between the second inkjet printed encapsulation layer 135 and the photochromic layer 140.

[0081] In this embodiment, the second inkjet printing encapsulation layer 135 can be used to level the surface again, and the third encapsulation layer 133 can be used to form a transition between the second inkjet printing encapsulation layer 135 and the photochromic layer 140, thereby better ensuring the flatness of the photochromic layer 140.

[0082] It should be understood that the first encapsulation layer 131, the second encapsulation layer 132, the third encapsulation layer 133, the first inkjet printing encapsulation layer 134, etc., included in the above-mentioned encapsulation layer 130 are all made of transparent materials so as to allow writing light or erasing light to pass through the encapsulation layer 130 and irradiate the photochromic layer 140.

[0083] In some optional embodiments, the display panel 100 further includes a third light-emitting unit; the third light-emitting unit is used to emit erasing light toward the photochromic layer 140 on the side of the photochromic layer 140 facing away from the substrate 110. For a detailed description of the erasing light, please refer to the embodiment of the second light-emitting unit 160 described above, and it will not be repeated here.

[0084] like Figure 11 As shown, the third light-emitting unit is not located on the side of the photochromic layer 140 closest to the substrate 110. Figure 12 As shown, the write light 158 ​​emitted by the first light-emitting unit 150 passes through the encapsulation layer 130 and irradiates the photochromic layer 140, forming a color-developing region 141 on the photochromic layer 140. The third light-emitting unit can emit an erasure light 163 towards the photochromic layer 140 on the side of the photochromic layer 140 away from the substrate 110, so that the color of the color-developing region 141 on the photochromic layer 140 changes to be the same as the original color region. The erasure light 163 emitted by the third light-emitting unit can be found in [reference needed]. Figure 13 As shown.

[0085] Similar to the first light-emitting unit 150, the third light-emitting unit may include a third anode layer, a third hole injection layer, a third hole transport layer, a third light-emitting layer, a third electron transport layer, a third electron injection layer, a third cathode layer, etc., arranged in sequence, which will not be described in detail here.

[0086] Optionally, the third light-emitting unit can be a movable light-emitting unit. When it is necessary to emit erasing light towards the color-producing area on the photochromic layer 140, the third light-emitting unit can be moved to the side of the photochromic layer away from the substrate 110, so that the third light-emitting unit emits erasing light towards the photochromic layer 140. When it is not necessary to emit erasing light towards the color-producing area on the photochromic layer 140, the third light-emitting unit can be removed to avoid the third light-emitting unit obstructing the user's view of the display panel 100. Of course, the third light-emitting unit can also be a light-emitting unit fixed to the side of the photochromic layer 140 away from the substrate 110. The embodiments of this application do not limit the specific arrangement of the third light-emitting unit.

[0087] In this embodiment, the display panel 100 further includes a third light-emitting unit; the third light-emitting unit is used to emit erasing light toward the photochromic layer 140 on the side of the photochromic layer 140 away from the substrate 110. The third light-emitting unit can be set to be movable, or the third light-emitting unit can be set to be fixed on the side of the photochromic layer 140 away from the substrate 110. This allows the setting of the third light-emitting unit to be independent of the setting of the substrate 110, the pixel light-emitting layer 120, the encapsulation layer 130 and the first light-emitting unit 150, making the setting of the light-emitting unit used to emit erasing light more flexible.

[0088] In some optional embodiments, the photochromic layer 140 may include a plurality of sub-color-changing layers stacked along the thickness direction of the display panel 100, and the color-producing area on the photochromic layer 140 includes a sub-color-producing area on the sub-color-changing layer. The color-producing area may be composed of a sub-color-changing layer or a combination of the sub-color-producing areas of a plurality of sub-color-changing layers.

[0089] The first light-emitting unit 150 may include multiple first sub-light-emitting units, each corresponding to a sub-color-changing layer. The first sub-light-emitting unit is used to emit write light, and the wavelength of the write light emitted by each first sub-light-emitting unit is different; the area on the sub-color-changing layer irradiated by the write light of the corresponding first sub-light-emitting unit undergoes a color change to form a sub-color-displaying area, and the color of the sub-color-displaying area formed on each sub-color-changing layer is different.

[0090] As a feasible implementation, each sub-color-changing layer only undergoes a color change to form a sub-color-displaying region under the illumination of the write light of its corresponding first sub-emitting unit, and does not produce a color change under the illumination of the write light of other first sub-emitting units. Specifically, each sub-color-changing layer can use different photochromic materials, and the wavelength of the write light required for the photochromic materials used in each sub-color-changing layer to produce a color change is different.

[0091] By combining sub-color zones with different sub-color-changing layers within the color-displaying zone, different colors can be displayed in the color-displaying zone, thus enabling the display panel 100 to present colorful patterns.

[0092] Optionally, the color of each sub-color-changing layer's sub-color-developing area can be configured to change to the same color as the original color area under the illumination of erasure light of different wavelengths. In this case, each of the aforementioned second light-emitting units 160 or third light-emitting units may include multiple second sub-light-emitting units, and each second sub-light-emitting unit corresponds one-to-one with a sub-color-changing layer. The second sub-light-emitting units are used to emit erasure light, and the wavelengths of the erasure light emitted by each second sub-light-emitting unit are different. After the sub-color-developing area on the sub-color-changing layer is illuminated by the erasure light of the corresponding second sub-light-emitting unit, the color of the sub-color-developing area changes to the same color as the original color area. After the sub-color-developing areas on other sub-color-changing layers are illuminated by the erasure light of the corresponding second sub-light-emitting unit, the color of the sub-color-developing areas on other sub-color-changing layers remains unchanged. Thus, it is possible to select the corresponding second sub-light-emitting unit to emit erasure light for a sub-color-developing area on a specific sub-color-changing layer, so that the color of that sub-color-developing area changes to the same color as the original color area, without interfering with the color maintenance of the sub-color-developing areas on other sub-color-changing layers. Alternatively, each sub-color-changing layer can be configured to change color to the same color as the sub-color-changing area within the original color area when illuminated by the same wavelength of erasure light. In this case, each of the second light-emitting units 160 can include a second sub-light-emitting unit. After the sub-color-changing area on each sub-color-changing layer is illuminated by the erasure light of the second sub-light-emitting unit, the color changes to the same color as the sub-color-changing area within the original color area.

[0093] In this embodiment, the photochromic layer 140 includes multiple sub-color-changing layers, and the first light-emitting unit 150 includes multiple first sub-light-emitting units, each corresponding to a sub-color-changing layer. Each first sub-light-emitting unit emits write light, and the wavelength of the write light emitted by each first sub-light-emitting unit is different. The area on the sub-color-changing layer irradiated by the write light of the corresponding first sub-light-emitting unit undergoes a color change, forming a sub-color-displaying area. The colors of the sub-color-displaying areas formed on each sub-color-changing layer are different. Therefore, by controlling the formation of sub-color-displaying areas on the corresponding sub-color-changing layer using each of the first sub-light-emitting units, the color of the color-displaying area can be adjusted by adjusting the sub-color-displaying areas included in the color-displaying area, allowing the color-displaying area to display multiple colors. This enables the display panel 100 to display colorful patterns, effectively improving the display effect of the display panel 100 and broadening its applicable scenarios.

[0094] like Figure 14 As shown, according to a second aspect of the embodiments of this application, a method for manufacturing a display panel is provided, the method comprising:

[0095] S210. A pixel light-emitting layer is formed on one side of the substrate.

[0096] S220. An encapsulation layer is formed on the side of the pixel light-emitting layer that is away from the substrate.

[0097] S230, A photochromic layer is formed on the side of the encapsulation layer opposite to the pixel light-emitting layer.

[0098] The pixel light-emitting layer is provided with a plurality of first light-emitting units, and the first light-emitting units are connected to a first driving circuit on the substrate. The first driving circuit is used to drive the first light-emitting units to emit writing light. The area on the photochromic layer that is irradiated by the writing light changes color to form a color-developing area and remains thereon. The color of the color-developing area is different from the color of the original color area on the photochromic layer that is not irradiated by the writing light. After being irradiated by the erasure light, the color of the color-developing area changes to be the same as the color of the original color area, and the color of the color-developing area remains unchanged before being irradiated by the erasure light.

[0099] In some alternative embodiments, a second light-emitting unit is formed on one side of the substrate where the pixel light-emitting layer is disposed.

[0100] In some optional embodiments, forming a second light-emitting unit on one side of the substrate where the pixel light-emitting layer is disposed includes: forming a plurality of second light-emitting units on the pixel light-emitting layer; wherein the orthographic projection of each first light-emitting unit on the photochromic layer is adjacent to the orthographic projection of at least one second light-emitting unit on the photochromic layer.

[0101] In some optional embodiments, forming a second light-emitting unit on the side of the substrate where the pixel light-emitting layer is disposed includes: forming the second light-emitting unit on the side of the first light-emitting unit away from the substrate; wherein at least a portion of the orthographic projection of the second light-emitting unit onto the photochromic layer intersects with the orthographic projection of the first light-emitting unit onto the photochromic layer;

[0102] In some alternative embodiments, along the thickness direction of the display panel, the second light-emitting unit is adjacent to the first light-emitting unit, and the orthographic projection of the second light-emitting unit on the photochromic layer coincides with the orthographic projection of the first light-emitting unit on the photochromic layer.

[0103] In some optional embodiments, forming an encapsulation layer on the side of the pixel light-emitting layer opposite to the substrate includes: forming a first encapsulation layer on the side of the pixel light-emitting layer opposite to the substrate; forming a second light-emitting unit on the side of the first light-emitting unit opposite to the substrate includes: forming a second light-emitting unit on the side of the first encapsulation layer opposite to the pixel light-emitting layer; forming an encapsulation layer on the side of the pixel light-emitting layer opposite to the substrate further includes: forming a second encapsulation layer on the side of the second light-emitting unit opposite to the first encapsulation layer;

[0104] In some optional embodiments, the orthographic projection of the first light-emitting unit onto the photochromic layer is located within the orthographic projection of the second light-emitting unit onto the photochromic layer;

[0105] In some optional embodiments, forming an encapsulation layer on the side of the pixel light-emitting layer away from the substrate further includes: forming a first inkjet-printed encapsulation layer on the side of the first encapsulation layer away from the pixel light-emitting layer, such that the first inkjet-printed encapsulation layer is located between the first encapsulation layer and the second light-emitting unit; or forming a first inkjet-printed encapsulation layer on the side of the second light-emitting unit away from the first encapsulation layer, such that the first inkjet-printed encapsulation layer is located between the second light-emitting unit and the second encapsulation layer.

[0106] In some optional embodiments, forming an encapsulation layer on the side of the pixel light-emitting layer away from the substrate further includes: forming a first inkjet-printed encapsulation layer on the side of the first encapsulation layer away from the pixel light-emitting layer, forming a second inkjet-printed encapsulation layer on the side of the second encapsulation layer away from the second light-emitting unit, and forming a third encapsulation layer on the side of the second inkjet-printed encapsulation layer away from the second encapsulation layer, such that the third encapsulation layer is located between the second inkjet-printed encapsulation layer and the photochromic layer.

[0107] The method for preparing the display panel provided in this application is based on the same inventive concept as the aforementioned display panel 100 embodiment and can achieve the same effect. For the specific implementation process, please refer to the description in the aforementioned display panel 100 embodiment, which will not be repeated here.

[0108] According to a third aspect of the embodiments of this application, a display device is provided, including a display panel 100 as described in any of the above embodiments. The display device may be a monitor, mobile phone, television, or tablet computer, etc.

[0109] The display device provided in this application embodiment is based on the same inventive concept as the aforementioned display panel 100 embodiment and can achieve the same effect. For the specific implementation process, please refer to the description in the aforementioned display panel 100 embodiment, which will not be repeated here.

[0110] It should be noted that, depending on the implementation needs, the various components / steps described in the embodiments of this application can be broken down into more components / steps, or two or more components / steps or parts of the operation of components / steps can be combined into new components / steps to achieve the purpose of the embodiments of this application.

[0111] The methods described above according to the embodiments of this application can be implemented in hardware, firmware, or as software or computer code that can be stored in a recording medium (such as CD-ROM, RAM, floppy disk, hard disk, or magneto-optical disk), or as computer code originally stored in a remote recording medium or a non-transitory machine-readable medium and to be stored in a local recording medium, downloaded via a network. Thus, the methods described herein can be stored as software processing on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware (such as an application-specific integrated circuit (ASIC) or a field-programmable gate array (FPGA)). It is understood that the computer, processor, microprocessor controller, or programmable hardware includes storage components (e.g., random access memory (RAM), read-only memory (ROM), flash memory, etc.) capable of storing or receiving software or computer code, implementing the methods described herein when the software or computer code is accessed and executed by the computer, processor, or hardware. Furthermore, when a general-purpose computer accesses the code used to implement the methods shown herein, the execution of the code transforms the general-purpose computer into a dedicated computer for executing the methods shown herein.

[0112] Those skilled in the art will recognize that the units and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this application.

[0113] The above embodiments are only used to illustrate the embodiments of this application, and are not intended to limit the embodiments of this application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of this application. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of this application, and the patent protection scope of the embodiments of this application should be defined by the claims.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate, a pixel light-emitting layer, an encapsulation layer and a photochromic layer; the pixel light-emitting layer is arranged on the substrate, the photochromic layer is arranged on the side of the pixel light-emitting layer away from the substrate, and the encapsulation layer is arranged between the pixel light-emitting layer and the photochromic layer; a plurality of first light-emitting units are arranged in the pixel light-emitting layer, and the first light-emitting units are connected with a first driving circuit on the substrate; the first driving circuit is used for driving the first light-emitting units to emit write-in light; an area of the photochromic layer irradiated by the write-in light changes color to form a color-developed area and remains unchanged; after the color-developed area is formed on the photochromic layer, the first light-emitting units can be extinguished; the color of the color-developed area is different from that of an original color area of the photochromic layer which is not irradiated by the write-in light; the color of the color-developed area changes to the same as that of the original color area after being irradiated by erasing light, and the color of the color-developed area remains unchanged before being irradiated by the erasing light; the display panel further comprises a second light-emitting unit for emitting erasing light, and the second light-emitting unit is arranged on the side of the photochromic layer close to the substrate.

2. The display panel of claim 1, wherein, The display panel comprises a plurality of the second light-emitting units, and the plurality of the second light-emitting units are located in the pixel light-emitting layer; and the orthographic projection of each first light-emitting unit on the photochromic layer is adjacent to the orthographic projection of at least one second light-emitting unit on the photochromic layer.

3. The display panel of claim 1, wherein, The second light-emitting unit is arranged on the side of the first light-emitting unit away from the substrate, and at least part of the orthographic projection of the second light-emitting unit on the photochromic layer intersects with the orthographic projection of the first light-emitting unit on the photochromic layer.

4. The display panel of claim 3, wherein, Along the thickness direction of the display panel, the second light-emitting unit is spaced apart from the first light-emitting unit, and the orthographic projection of the first light-emitting unit on the photochromic layer is located in the orthographic projection of the second light-emitting unit on the photochromic layer.

5. The display panel of claim 4, wherein, The second light-emitting unit is arranged between the pixel light-emitting layer and the photochromic layer; and The encapsulation layer comprises a first encapsulation layer and a second encapsulation layer, the first encapsulation layer is arranged between the pixel light-emitting layer and the second light-emitting unit, and the second encapsulation layer is arranged between the second light-emitting unit and the photochromic layer.

6. The display panel of claim 5, wherein, The encapsulation layer further comprises a first inkjet printing encapsulation layer; the first inkjet printing encapsulation layer is located between the first encapsulation layer and the second light-emitting unit, or the first inkjet printing encapsulation layer is located between the second light-emitting unit and the second encapsulation layer.

7. The display panel of claim 6, wherein, The encapsulation layer further comprises a second inkjet printing encapsulation layer and a third encapsulation layer; when the first inkjet printing encapsulation layer is located between the first encapsulation layer and the second light-emitting unit, the second inkjet printing encapsulation layer is arranged on the side of the second encapsulation layer close to the photochromic layer, and the third encapsulation layer is arranged between the second inkjet printing encapsulation layer and the photochromic layer.

8. The display panel of claim 1, wherein, The second light-emitting unit is arranged on the side of the first light-emitting unit away from the substrate, is adjacent to the first light-emitting unit, and the orthographic projection of the second light-emitting unit on the photochromic layer is coincident with the orthographic projection of the first light-emitting unit on the photochromic layer.

9. The display panel of claim 1, wherein, The photochromic layer comprises a plurality of sub-photochromic layers stacked along the thickness direction of the display panel, and the color developing region on the photochromic layer comprises a sub-color developing region on the sub-photochromic layer; the first light-emitting unit comprises a plurality of first sub-light-emitting units, and each first sub-light-emitting unit corresponds to a sub-photochromic layer; The first sub-light-emitting unit is used for emitting the write light, and the wavelength of the write light emitted by each first sub-light-emitting unit is different; the area on the sub-photochromic layer irradiated by the write light of the corresponding first sub-light-emitting unit changes color to form the sub-color developing region, and the color of the sub-color developing region formed on each sub-photochromic layer is different.

10. A method for manufacturing a display panel, characterized by, The method comprises: forming a pixel light-emitting layer on one side of a substrate; forming an encapsulation layer on the side of the pixel light-emitting layer away from the substrate; forming a photochromic layer on the side of the encapsulation layer away from the pixel light-emitting layer; The pixel light-emitting layer is provided with a plurality of first light-emitting units, and the first light-emitting units are connected with a first drive circuit on the substrate; the first drive circuit is used for driving the first light-emitting units to emit write light; the area on the photochromic layer irradiated by the write light changes color to form a color developing region and remains unchanged; after the color developing region is formed on the photochromic layer, the first light-emitting units can be extinguished; the color of the color developing region is different from the color of an original color region on the photochromic layer which is not irradiated by the write light; the color of the color developing region changes to the same color as the original color region after being irradiated by an erasing light, and the color of the color developing region remains unchanged before being irradiated by the erasing light; The method further comprises: forming a second light-emitting unit on the side of the substrate provided with the pixel light-emitting layer; the second light-emitting unit is used for emitting the erasing light, and the second light-emitting unit is arranged on the side of the photochromic layer close to the substrate.

11. The method of claim 10, wherein, The forming of the second light-emitting unit on the side of the substrate provided with the pixel light-emitting layer comprises: forming a plurality of second light-emitting units on the pixel light-emitting layer; wherein the orthographic projection of each first light-emitting unit on the photochromic layer is adjacent to the orthographic projection of at least one second light-emitting unit on the photochromic layer.

12. The method of claim 10, wherein, The forming of the second light-emitting unit on the side of the substrate provided with the pixel light-emitting layer comprises: forming the second light-emitting unit on the side of the first light-emitting unit away from the substrate; wherein at least part of the orthographic projection of the second light-emitting unit on the photochromic layer intersects with the orthographic projection of the first light-emitting unit on the photochromic layer.

13. The method of claim 12, wherein, The forming of the encapsulation layer on the side of the pixel light-emitting layer away from the substrate comprises: forming a first encapsulation layer on the side of the pixel light-emitting layer away from the substrate; forming the second light emitting unit on a side of the first encapsulation layer away from the pixel light emitting layer. forming a second encapsulation layer on a side of the second light emitting unit away from the first encapsulation layer.

14. The method of claim 10, wherein, a first light emitting unit in a perspective projection of the photochromic layer is within a perspective projection of the second light emitting unit in the photochromic layer.

15. The method of claim 13, wherein, forming a first inkjet printing encapsulation layer on a side of the first encapsulation layer away from the pixel light emitting layer, so that the first inkjet printing encapsulation layer is between the first encapsulation layer and the second light emitting unit, or forming a first inkjet printing encapsulation layer on a side of the second light emitting unit away from the first encapsulation layer, so that the first inkjet printing encapsulation layer is between the second light emitting unit and the second encapsulation layer.

16. The method of claim 13, wherein, forming a first inkjet printing encapsulation layer on a side of the first encapsulation layer away from the pixel light emitting layer, forming a second inkjet printing encapsulation layer on a side of the second encapsulation layer away from the second light emitting unit, and forming a third encapsulation layer on a side of the second inkjet printing encapsulation layer away from the second encapsulation layer, so that the third encapsulation layer is between the second inkjet printing encapsulation layer and the photochromic layer.

17. A display device comprising: The display panel includes the display panel as claimed in any one of claims 1-9.

Images