Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method of the display panel and a display device. The problem that in the prior art, the transmittance and the contrast ratio of a display panel cannot be dynamically adjusted in real time is solved. The display panel includes: a substrate; the first electrochromic device is positioned on one side of the substrate; the light-emitting device is located on the side, away from the substrate, of the first electrochromic device, and the orthographic projection of the light-emitting device on the substrate and the orthographic projection of the first electrochromic device on the substrate are partially overlapped; wherein the light-emitting device is connected in series with the first electrochromic device. In the display panel provided by the embodiment of the invention, the light-emitting device and the first electrochromic device are stacked, and the light-emitting device and the first electrochromic device are connected in series, so that the first electrochromic device is more reasonably integrated in the display panel, and the structure of the display panel is more compact.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a method for preparing the same, and a display device. Background Art

[0002] Current display panels, such as transparent display panels, have extremely high transparent display transmittance. When the external ambient light is strong, the contrast is reduced and the display effect is greatly weakened, which limits the application scenarios of transparent display panels. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a display panel and a method for manufacturing the same, and a display device, which solve the problem in the prior art that the display panel cannot dynamically adjust the transmittance and contrast in real time.

[0004] In a first aspect, the present application provides a display panel, the display panel comprising:

[0005] substrate;

[0006] A first electrochromic device is located on one side of the substrate;

[0007] A light emitting device is located on a side of the first electrochromic device away from the substrate, and an orthographic projection of the light emitting device on the substrate partially overlaps with an orthographic projection of the first electrochromic device on the substrate;

[0008] Wherein, the light emitting device is connected in series with the first electrochromic device.

[0009] In one embodiment, the first electrochromic device includes a first electrode layer, an electrochromic functional layer, and a second electrode layer which are stacked, and the first electrode layer is located on a side of the second electrode layer close to the substrate;

[0010] The light emitting device comprises a third electrode layer, a light emitting functional layer and a fourth electrode layer which are stacked, wherein the third electrode layer is located on a side of the fourth electrode layer close to the substrate;

[0011] The second electrode layer and the third electrode layer are the same electrode layer.

[0012] In one embodiment, the display panel includes a first driving circuit, the first driving circuit is located on a side of the electrochromic device close to the substrate, and the first driving circuit is electrically connected to the first electrochromic device or the light-emitting device.

[0013] In one embodiment, the display panel includes a display area and a transparent area, the transparent area surrounds the display area, and the light emitting device and the first electrochromic device are located in the display area;

[0014] Preferably, along a direction parallel to the substrate, the first electrochromic device extends to the transparent area;

[0015] Preferably, the orthographic projection of the first electrochromic device on the substrate covers the orthographic projection of the transparent area on the substrate.

[0016] In one embodiment, the display panel includes a display area and a transparent area, the transparent area surrounds the display area, and the display panel further includes a second electrochromic device located in the transparent area;

[0017] Preferably, the first electrochromic device and the second electrochromic device are arranged in the same layer and spaced apart;

[0018] Preferably, the orthographic projection of the second electrochromic device on the substrate covers the orthographic projection of the transparent area on the substrate;

[0019] Preferably, the display panel further includes a second driving circuit, and the second driving circuit is electrically connected to the second electrochromic device.

[0020] In one embodiment, the electrochromic functional layer includes an electrochromic layer, an ion transport layer and an ion storage layer which are stacked, and the electrochromic layer is located on a side of the ion storage layer away from the second electrode layer, or the electrochromic layer is located on a side of the ion storage layer away from the first electrode layer;

[0021] The electrochromic layer includes an inorganic material;

[0022] Preferably, the electrochromic layer comprises a metal oxide;

[0023] Preferably, the electrochromic layer includes at least one of tungsten oxide, niobium oxide, titanium oxide, molybdenum oxide, copper oxide, chromium oxide, manganese oxide, vanadium oxide, cobalt oxide and nickel oxide.

[0024] In one embodiment, the display panel further comprises a pixel defining layer, the pixel defining layer comprises a plurality of openings, and the light emitting device is located in the opening;

[0025] The pixel defining layer extends toward the substrate in a direction perpendicular to the substrate, and the first electrochromic device is located in the pixel defining layer;

[0026] Preferably, the display panel includes a display area and a transparent area, the transparent area surrounds the display area, the display panel further includes a second electrochromic device, the light emitting device and the first electrochromic device are located in the display area, and the second electrochromic device is located in the transparent area;

[0027] The orthographic projection of the pixel defining layer on the substrate covers the orthographic projection of the transparent area on the substrate;

[0028] The second electrochromic device is located in the pixel defining layer.

[0029] A second aspect of the present application provides a method for preparing a display panel, the method comprising:

[0030] preparing a first electrochromic device on one side of the substrate;

[0031] Prepare a light-emitting device on a side of the first electrochromic device away from the substrate;

[0032] The orthographic projection of the light-emitting device on the substrate partially overlaps with the orthographic projection of the first electrochromic device on the substrate; the light-emitting device and the first electrochromic device are connected in series.

[0033] In one embodiment, the display panel includes a display area and a transparent area, the transparent area surrounds the display area, and preparing the first electrochromic device on one side of the substrate includes: preparing the first electrochromic device in the display area;

[0034] Preferably, the display panel further includes a second electrochromic device located in the transparent area; after preparing the first electrochromic device on one side of the substrate and before preparing the light-emitting device on the side of the first electrochromic device away from the substrate, it further includes: preparing the second electrochromic device in the transparent area.

[0035] A third aspect of the present application provides a display device, which includes: the above-mentioned display panel, or the display panel prepared by the above-mentioned preparation method.

[0036] In the display panel of the embodiment of the present application, the light-emitting device and the first electrochromic device are stacked and connected in series, which is conducive to integrating the first electrochromic device into the display panel more reasonably, so that the structure of the display panel is more compact; at the same time, the setting of the first electrochromic device can enable the display panel to adjust the transmittance and contrast in real time, so that clear display can be achieved even in the case of strong external ambient light, and the display effect is excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of a display panel in one embodiment of the present application.

[0038] Figure 2 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0039] Figure 3 This is a schematic diagram of the structure of the electrochromic functional layer in one embodiment of the present application.

[0040] Figure 4 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0041] Figure 5 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0042] Figure 6This is a schematic diagram of a top view of the structure of a display panel in another embodiment of the present application.

[0043] Figure 7 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0044] Figure 8 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0045] Fig. 9 This is a schematic diagram of the structure of a display panel in another embodiment of the present application.

[0046] Fig.10 This is a schematic diagram of the structure of a display panel in one embodiment of the present application.

[0047] Fig.11 The figure is a schematic flow chart of a method for preparing a display panel in one embodiment of the present application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods and means well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0050] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0051] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0052] The present application provides a display panel according to a first aspect. Figure 1The structural schematic diagram of the display panel shown in the figure comprises: a substrate 100; a first electrochromic device 200, which is located on one side of the substrate 100; a light-emitting device 300, which is located on a side of the first electrochromic device 200 away from the substrate 100, and the orthographic projection of the light-emitting device 300 on the substrate 100 partially overlaps with the orthographic projection of the first electrochromic device 200 on the substrate 100; wherein the light-emitting device 300 is connected in series with the first electrochromic device 200.

[0053] It should be noted that the first electrochromic device 200 includes a first electrode layer 210, an electrochromic functional layer 220 and a second electrode layer 230 which are stacked, and the light-emitting device 300 includes a third electrode layer 310, a light-emitting functional layer 320 and a fourth electrode layer 330 which are stacked. The light-emitting device 300 and the first electrochromic device 200 are connected in series, which means that the current flows through the first electrode layer 210, the electrochromic functional layer 220, the second electrode layer 230, the third electrode layer 310, the light-emitting functional layer 320 and the fourth electrode layer 330 in sequence, or the current flows through the fourth electrode layer 330, the light-emitting functional layer 320, the third electrode layer 310, the second electrode layer 230, the electrochromic functional layer 220 and the first electrode layer 210 in sequence.

[0054] In the display panel of the embodiment of the present application, the light-emitting device and the first electrochromic device are stacked and connected in series, which is conducive to integrating the first electrochromic device into the display panel more reasonably, so that the structure of the display panel is more compact; at the same time, the first electrochromic device can change color as needed, and the contrast between the color of the first electrochromic device and the light emitted by the light-emitting device can be adjusted in real time, and the transmittance of the display panel can also be adjusted in real time, so that the display panel can display clearly even in the case of strong external ambient light, and the display effect is excellent.

[0055] It is understandable that the first electrochromic device can be changed to a darker color such as black, blue or blue-black, so that the contrast between the color of the first electrochromic device and the light emitted by the light-emitting device is high, making the image displayed by the display panel clearer. Moreover, it is a prior art that the first electrochromic device can improve the contrast of the display panel by adjusting the color, which will not be described in detail here.

[0056] Exemplarily, the light-emitting device 300 includes a red light-emitting device, a green light-emitting device, a blue light-emitting device, and the like, and a first electrochromic device 200 is respectively arranged between the red light-emitting device, the green light-emitting device, the blue light-emitting device and the substrate 100. For example, the red light-emitting device is connected in series with its corresponding first electrochromic device 200, the green light-emitting device is connected in series with its corresponding first electrochromic device 200, and the blue light-emitting device is connected in series with its corresponding first electrochromic device 200, and the electrochromic devices corresponding to light-emitting devices of different colors are different.

[0057] In one embodiment, referring to Figure 2 As shown in the structural schematic diagram of the display panel, the first electrochromic device 200 includes a first electrode layer 210, an electrochromic functional layer 220 and a second electrode layer 230 which are stacked, and the first electrode layer 210 is located on the side of the second electrode layer 230 close to the substrate 100; the light-emitting device 300 includes a third electrode layer 310, a light-emitting functional layer 320 and a fourth electrode layer 330 which are stacked, and the third electrode layer 310 is located on the side of the fourth electrode layer 330 close to the substrate 100.

[0058] It can be understood that the light emitting device 300 and the first electrochromic device 200 are connected in series in such a way that the second electrode layer 230 is electrically connected to the third electrode layer 310, and the second electrode layer 230 and the third electrode layer 310 are electrically connected in such a way that the third electrode layer 310 and the second electrode layer 230 are electrically connected through a connection structure, or the third electrode layer 310 and the second electrode layer 230 are directly contacted and electrically connected, and the third electrode layer 310 and the second electrode layer 230 can also be reused as the same electrode layer, so that the light emitting device 300 and the first electrochromic device 200 share an electrode layer and thus realize series connection. In a preferred embodiment, the second electrode layer 230 and the third electrode layer 310 are reused as the same electrode layer. As a result, the display panel has a higher degree of integration, which is conducive to reducing the thickness of the display panel, and is conducive to reducing the preparation process of the display panel, and the first electrochromic device 200 has an excellent effect of adjusting the display contrast of the display panel.

[0059] In one embodiment, referring to Figure 3 As shown in the structural schematic diagram of the electrochromic functional layer, the electrochromic functional layer 220 includes an electrochromic layer 221, an ion transport layer 222 and an ion storage layer 223 which are stacked, and the electrochromic layer 221 is located on a side of the ion storage layer 223 away from the second electrode layer 230.

[0060] Exemplarily, the working principle of the first electrochromic device 200 mainly involves the migration process of ions under the action of the electric field of the applied voltage; when the first electrochromic device 200 is working, a certain voltage is applied between the first electrode layer 210 and the second electrode layer 230, so that the electrochromic layer 221 undergoes an oxidation-reduction reaction under the action of the voltage, thereby changing the color. The ion transport layer 222 (also referred to as the electrolyte layer) is composed of a conductive material, such as a solution or solid electrolyte material. When the electrochromic layer 221 undergoes an oxidation-reduction reaction, the ion storage layer 223 plays the role of storing and providing the ions required by the electrochromic layer 221, and can play the role of superimposing or complementing colors. It can be understood that the working principle of the electrochromic device is a prior art and will not be described in detail here.

[0061] It is understandable that when the first electrode layer 210 is an anode, the electrochromic layer 221 includes an anode electrochromic material, and when the first electrode layer 210 is a cathode, the electrochromic layer 221 includes a cathode electrochromic material. Anode electrochromic materials (such as nickel oxide) and cathode electrochromic materials (such as tungsten trioxide) are prior art and will not be described in detail here.

[0062] Exemplarily, the first electrode layer 210 and the second electrode layer 230 may be transparent. Optionally, the first electrode layer 210 and the second electrode layer 230 are made of ITO (indium tin oxide).

[0063] In one embodiment, in order to improve the contrast of the display panel, the electrochromic color of the electrochromic layer 221 can be black, gray, brown, blue, etc., which can be flexibly selected according to actual conditions. It is understandable that different electrochromic colors can be achieved by selecting the material of the electrochromic layer 221.

[0064] In one embodiment, the electrochromic layer includes an inorganic material, so that the electrochromic layer has strong heat resistance and stability, and is not easily deformed during the preparation process, so that the yield of the display panel is high.

[0065] In one embodiment, the electrochromic layer includes metal oxides; in a preferred embodiment, the electrochromic layer includes at least one of tungsten oxide, niobium oxide, titanium oxide, molybdenum oxide, copper oxide, chromium oxide, manganese oxide, vanadium oxide, cobalt oxide and nickel oxide. Therefore, the above materials have good electrochromic effects, and the electrochromic colors of the electrochromic layer can be controlled by selecting different materials to meet the use requirements of different scenes; and the above materials are relatively stable and easy to manufacture.

[0066] In one embodiment, the ion transport layer includes an electrolyte, and illustratively, the electrolyte may be a gel polymer or the like; the ion storage layer may be a counter electrode layer, and the material of the ion storage layer includes nickel oxide or the like.

[0067] Exemplarily, when the third electrode layer 310 of the light-emitting device 300 is an anode, in a direction along the substrate 100 pointing toward the first electrochromic device 200, the electrochromic functional layer 220 includes an electrochromic layer 221, an ion transport layer 222 and an ion storage layer 223 arranged in a stacked manner, and the first electrode layer 210 is a cathode.

[0068] In one embodiment, referring to Figure 4 The structural schematic diagram of the display panel shown in the figure, the display panel includes a first driving circuit 400, the first driving circuit 400 is located on the side of the first electrochromic device 200 close to the substrate 100, and the first driving circuit 400 is electrically connected to the first electrochromic device 200 or the light-emitting device 300. Thus, the first driving circuit 400 drives the first electrochromic device 200 and the light-emitting device 300 at the same time, which is conducive to reducing the setting of the driving circuit, and is conducive to improving the integration of the display panel, and further conducive to increasing the area of ​​the transparent region of the display panel.

[0069] It can be understood that the first driving circuit 400 can be electrically connected to the first electrochromic device 200, and can also be electrically connected to the light-emitting device 300; in a preferred embodiment, the first driving circuit 400 can be electrically connected to the first electrochromic device 200, specifically, the first driving circuit is electrically connected to the first electrode layer 210, and the structure of the display panel is more compact and convenient to manufacture.

[0070] Exemplarily, when the first driving circuit is electrically connected to the first electrode layer 210 , a connecting line can be set between the first driving circuit and the first electrode layer 210 . The connecting line can be an independent film layer prepared independently, or it can be a part of the first electrode layer 210 and prepared simultaneously with the first electrode layer 210 .

[0071] It is understandable that when the first electrochromic device 200 is connected in series with the light-emitting device 300, the voltage outputted by the first driving circuit 400 can be adjusted to control whether the first electrochromic device 200 is working. For example, when the display contrast of the display panel needs to be adjusted during the display phase, the first driving circuit 400 outputs a relatively large voltage to drive the first electrochromic device 200 and the light-emitting device 300 to work simultaneously; when the display contrast of the display panel does not need to be adjusted during the display phase, the first driving circuit 400 outputs a relatively small voltage, which can only drive the light-emitting device 300 but cannot drive the first electrochromic device 200.

[0072] In one embodiment, referring to Figure 5 The structure diagram of the display panel shown in the figure includes a display area 10 and a transparent area 20, and the light emitting device 300 and the first electrochromic device 200 are located in the display area 10. accomplishDisplay area 10 Dynamic adjustment of contrast, The display panel can not only realize transparent display, but also realize control of display contrast of the display panel. For example, when the external ambient light is strong, the first electrochromic device 200 can adjust the display contrast of the display panel to make the display panel have higher clarity.

[0073] Exemplarily, the orthographic projection of the transparent area 20 on the substrate 100 is connected to the orthographic projection of the display area 10 on the substrate 100. In a preferred embodiment, referring to Figure 6 As shown in the schematic diagram of the positional relationship between the transparent area and the display area, the transparent area 20 surrounds the display area 10, and the transparent display effect of the display panel is better.

[0074] In one embodiment, referring to Figure 6 The display area 10 includes multiple sub-display areas 11, each sub-display area 11 includes multiple light-emitting devices 300, for example, each sub-display area 11 includes a red light-emitting device, a green light-emitting device and a blue light-emitting device. The specific number and color of the light-emitting devices in each sub-display area 11 can be flexibly selected according to actual conditions.

[0075] For example, refer to Figure 5 The first driving circuit 400 includes an active layer 440, a first metal layer 410, a second metal layer 420 and a third metal layer 430 stacked in sequence, the active layer 440 is located on the side of the first metal layer 410 close to the substrate 100, and an insulating layer 450, the insulating layer 450 includes an interlayer insulating layer located between two adjacent layers of the active layer 440, the first metal layer 410, the second metal layer 420 and the third metal layer 430.

[0076] Exemplarily, the first driving circuit includes a transistor. The transistor includes a semiconductor, a gate, a source and a drain, and a connecting electrode connected to the first electrochromic device 200. As an example, the gate and the first electrode plate can be located in the first metal layer 410, the source and the drain can be located in the second metal layer 420, and the connecting electrode can be located in the third metal layer 430.

[0077] In one embodiment, referring to Figure 7 In the structural diagram of the display panel shown, the first electrochromic device 200 extends to the transparent area 20 in a direction parallel to the substrate 100. Therefore, when the first electrochromic device 200 changes color, the contrast and transmittance of a display panel with a larger area can be dynamically adjusted, and even the contrast and transmittance of the entire display panel can be dynamically adjusted, so that the display effect of the display panel is more excellent.

[0078] In one embodiment, the orthographic projection of the first electrochromic device 200 on the substrate 100 covers the orthographic projection of the transparent area 20 on the substrate 100. Therefore, when the first electrochromic device 200 changes color, the contrast and transmittance of a display panel with a larger area can be adjusted, so that the display effect of the display panel is more excellent.

[0079] In one embodiment, referring to Figure 8 The structural schematic diagram of the display panel shown in the figure, the display panel includes a display area 10 and a transparent area 20, the transparent area 20 surrounds the display area 10, and the display panel also includes a second electrochromic device 500, which is located in the transparent area 20. Therefore, the first electrochromic device 200 and the second electrochromic device 500 cooperate with each other to adjust the display contrast of the entire display panel, so that the display panel has a better display effect. For example, only the first electrochromic device 200 can be operated, the display area 10 of the display panel has a higher contrast, the display panel has a better display effect and a higher transparency; the first electrochromic device 200 and the second electrochromic device 500 can also be operated at the same time, so that the contrast of the display panel is higher and the display effect is excellent.

[0080] Illustratively, the second electrochromic device 500 includes a fifth electrode layer 510 , a second electrochromic functional layer 520 , and a sixth electrode layer 530 which are stacked. The fifth electrode layer 510 is located on a side of the sixth electrode layer 530 close to the substrate 100 .

[0081] Exemplarily, the fifth electrode layer 510 and the sixth electrode layer 530 may be transparent. Optionally, the material of the fifth electrode layer 510 and the sixth electrode layer 530 is ITO (indium tin oxide).

[0082] Illustratively, the electrochromic functional layer of the second electrochromic device includes an electrochromic layer, an ion transport layer, and an ion storage layer that are stacked, and the electrochromic layer is located on a side of the ion storage layer away from the sixth electrode layer.

[0083] Exemplarily, the working principle of the second electrochromic device mainly involves the migration process of ions under the action of the electric field of the applied voltage; when the second electrochromic device is working, a certain voltage is applied between the fifth electrode layer and the sixth electrode layer, so that the electrochromic layer undergoes an oxidation-reduction reaction under the action of the voltage, thereby changing the color. The ion transport layer (also referred to as the electrolyte layer) is composed of a conductive material, such as a solution or solid electrolyte material. When the electrochromic layer undergoes an oxidation-reduction reaction, the ion storage layer plays the role of storing and providing the ions required for the electrochromic layer, and can play the role of superimposing or complementing colors. It can be understood that the working principle of the electrochromic device is a prior art and will not be described in detail here.

[0084] It is understandable that when the fifth electrode layer is an anode, the electrochromic layer includes an anode electrochromic material, and when the fifth electrode layer is a cathode, the electrochromic layer includes a cathode electrochromic material. Anode electrochromic materials (such as nickel oxide) and cathode electrochromic materials (such as tungsten trioxide) are prior art and will not be described in detail here.

[0085] In one embodiment, the first electrochromic device 200 and the second electrochromic device 500 are arranged in the same layer and spaced apart from each other. Thus, the structure of the display panel is more compact, the integration is higher, and the manufacturing process of the display panel can be reduced.

[0086] It can be understood that the first electrochromic device 200 and the second electrochromic device 500 are in the same layer, which can be understood as the first electrochromic device 200 and the second electrochromic device 500 are located in the same layer in structure, and can also be understood as the first electrochromic device 200 and the second electrochromic device 500 are prepared by the same preparation process. It should be noted that when the first electrochromic device 200 and the second electrochromic device 500 are prepared by the same preparation process, the first electrochromic device 200 and the second electrochromic device 500 0 may have height inconsistency or staggered structure in spatial position, for example, the first electrochromic device 200 is thicker than the second electrochromic device 500, or the first electrochromic device 200 and the second electrochromic device 500 are not strictly located in the same layer in structure, or part of the structure of the first electrochromic device 200 is located on the side of the second electrochromic device 500 close to or away from the substrate 100, or part of the structure of the second electrochromic device 500 is located on the side of the first electrochromic device 200 close to or away from the substrate 100. In a preferred embodiment, each film layer in the first electrochromic device 200 and the second electrochromic device 500 are prepared by the same preparation process, which is conducive to saving the preparation process of the display panel.

[0087] In one embodiment, the orthographic projection of the second electrochromic device 500 on the substrate 100 covers the orthographic projection of the transparent area 20 on the substrate 100. Thus, the first electrochromic device 200 and the second electrochromic device 500 cooperate with each other to adjust the display contrast of the entire display panel, so that the display panel has a better display effect. For example, only the first electrochromic device 200 can be operated, the display area 10 of the display panel has a higher contrast, the display panel has a better display effect and a higher transparency; the first electrochromic device 200 and the second electrochromic device 500 can also be operated at the same time, so that the display panel has a higher contrast and an excellent display effect.

[0088] In one embodiment, referring to Figure 8As shown in the structural schematic diagram of the display panel, the display panel further includes a second driving circuit 600, the second driving circuit 600 is electrically connected to the second electrochromic device 500, and the second driving circuit 600 is located on the side of the first electrochromic device 200 close to the substrate 100. It can be understood that the first driving circuit 400 and the second driving circuit 600 are two independent driving circuits, and the first driving circuit 400 and the second driving circuit 600 independently drive the first electrochromic device 200 and the second electrochromic device 500, so that the first electrochromic device 200 and the second electrochromic device 500 can be driven independently, and the controllability is better.

[0089] Exemplarily, the second driving circuit 600 is electrically connected to the fifth electrode layer 510 of the second electrochromic device 500. Exemplarily, when the second driving circuit 600 is electrically connected to the fifth electrode layer 510 of the second electrochromic device 500, a connecting line can be set between the second driving circuit 600 and the five-electrode layer 510. The connecting line can be an independent film layer prepared independently, or it can be a part of the five-electrode layer 510 and prepared simultaneously with the five-electrode layer 510.

[0090] For example, refer to Figure 8 The second driving circuit 600 includes an active layer 440, a first metal layer 410, a second metal layer 420 and a third metal layer 430 stacked in sequence, the active layer 440 is located on the side of the first metal layer 410 close to the substrate 100, and an insulating layer 450, the insulating layer 450 includes an interlayer insulating layer located between two adjacent layers of the active layer 440, the first metal layer 410, the second metal layer 420 and the third metal layer 430.

[0091] Exemplarily, the second driving circuit includes a transistor. The transistor includes a semiconductor, a gate, a source and a drain, and a connecting electrode connected to the first electrochromic device 200. As an example, the gate and the first electrode plate can be located in the first metal layer 410, the source and the drain can be located in the second metal layer 420, and the connecting electrode can be located in the third metal layer 430.

[0092] In one embodiment, the orthographic projection of the second driving circuit 600 on the substrate 100 is located within the orthographic projection range of the display area 10 on the substrate 100. Therefore, the transparency effect of the transparent area 20 is hardly affected, which is conducive to improving the transparency of the display panel.

[0093] Illustratively, the first driving circuit and the second driving circuit may be manufactured simultaneously during the manufacturing process, thereby reducing the manufacturing steps of the display panel.

[0094] In one embodiment, referring to Fig. 9 and Fig.10As shown in the structural schematic diagram of the display panel, the display panel further includes a pixel defining layer 700, the pixel defining layer 700 includes a plurality of openings, and the light emitting device 300 is located in the opening.

[0095] It can be understood that the pixel defining layer is used to limit the third electrode layer and the light-emitting layer in the light-emitting device. In this case, along the direction perpendicular to the substrate, the opening in the pixel defining layer does not penetrate the pixel defining layer, but a groove is opened on the surface of the pixel defining layer away from the substrate, and the light-emitting device is set in the groove. In the groove, a first electrochromic device is prepared on the side of the light-emitting device close to the substrate, and then a through hole is opened in the pixel defining layer between the first electrochromic device and the first drive circuit, and a conductive layer is filled in the through hole to electrically connect the first drive circuit to the first electrode layer. It can be understood that the setting of the pixel defining layer can also facilitate the production of the first electrochromic device. At the same time, the setting of the pixel defining layer makes the structure of the display panel more compact and is also conducive to reducing the preparation process of the display panel.

[0096] In a preferred embodiment, the pixel defining layer 700 extends toward the substrate 100 in a direction perpendicular to the substrate 100, and the first electrochromic device 200 is located in the opening. Thus, preparing the first electrochromic device 200 in the opening of the pixel defining layer 700 can make full use of the existing film layer in the display panel, without adding an additional film layer, thereby reducing the preparation process of the display panel.

[0097] In one embodiment, the display panel further includes a first driving circuit 400, which is located between the pixel defining layer 700 and the substrate 100, and the first driving circuit 400 is electrically connected to the first electrochromic device 200 or the light emitting device 300. Thus, the first electrochromic device 200 and the light emitting device 300 can be driven simultaneously by the first driving circuit 400, thereby improving the integration of the display panel.

[0098] Exemplarily, the first driving circuit 400 is electrically connected to the first electrode layer 210 of the first electrochromic device 200 ; exemplary, the first driving circuit 400 is electrically connected to the fourth electrode layer 330 of the light emitting device 300 .

[0099] In a preferred embodiment, referring to Fig.10The structural schematic diagram of the display panel shown in the figure, the display panel includes a display area 10 and a transparent area 20, the transparent area 20 surrounds the display area 10, the display panel also includes a second electrochromic device 500, the light emitting device 300 and the first electrochromic device 200 are located in the display area 10, and the second electrochromic device 500 is located in the transparent area 20; the orthographic projection of the pixel defining layer 700 on the substrate 100 covers the orthographic projection of the transparent area 20 on the substrate 100; the second electrochromic device 500 is located in the pixel defining layer 700. Therefore, preparing the second electrochromic device 500 in the pixel defining layer 700 can make full use of the existing film layer in the display panel, without adding an external film layer, and reducing the preparation process of the display panel.

[0100] In one embodiment, referring to Fig. 9 and Fig.10 As shown in the structural schematic diagram of the display panel, the display panel further includes a support column 800 located on the surface of the pixel defining layer 700 away from the substrate 100.

[0101] By way of example, a planarization layer 30 may be further disposed on a surface of the pixel defining layer 700 close to the substrate 100 .

[0102] Exemplarily, the display panel further includes a buffer layer located between the substrate and the first driving circuit and the second driving circuit.

[0103] Exemplarily, the material of the substrate is a first polyimide, a first barrier layer, a second polyimide, and a second barrier layer stacked in sequence, and the first polyimide is located on the side of the first barrier layer away from the first drive circuit, that is, the substrate of this embodiment is a laminated structure, and the material of the first barrier layer and the second barrier layer can be silicon oxide. The barrier layer can play a role in heat insulation, thereby preventing the heat generated by laser stripping from diffusing to the first drive circuit and the second drive circuit. It can be understood that the substrate can also be a single-layer film structure (such as a single-layer PI film), and this embodiment does not specifically limit the material and structure (laminated or single layer) of the substrate layer. In addition, the substrate can be formed on the substrate by deposition, and the substrate can be a glass substrate or a flexible substrate such as CPI or PI. This embodiment does not specifically limit the material of the substrate.

[0104] Exemplarily, the display panel may further include an encapsulation layer, a touch layer and a cover plate, wherein the encapsulation layer is located on a side of the support column away from the substrate, the touch layer is located on a side of the encapsulation layer away from the substrate, and the cover plate is located on a side of the touch layer away from the substrate, wherein the encapsulation layer, the touch layer and the cover plate are all conventional structures and materials in the art, and will not be described in detail herein. The display panel of the embodiment of the present application can realize real-time contrast adjustment. When a transparent display scenario is required, the first electrochromic device and / or the second electrochromic device of the display panel do not work, and the transmittance of the entire screen will be improved; when the contrast scenario needs to be increased, the first electrochromic device and / or the second electrochromic device work, and the electrochromic film layer of the entire screen can be colored, and the contrast and transmittance of the full-screen display can be adjusted dynamically in real time.

[0105] The display panel of the embodiment of the present application can be applied to automobile light curtains or architectural glass to improve the aesthetics of automobile or architectural glass.

[0106] A second aspect of the present application provides a method for preparing a display panel, referring to Fig.11 The schematic flow chart of the method for preparing a display panel is shown, and the method for preparing the display panel includes the following steps.

[0107] S100: preparing a first electrochromic device on one side of a substrate.

[0108] It should be noted that the first electrochromic device is consistent with the above description and will not be described in detail here.

[0109] S200: preparing a light-emitting device on a side of the first electrochromic device away from the substrate.

[0110] The orthographic projection of the light-emitting device on the substrate partially overlaps with the orthographic projection of the first electrochromic device on the substrate; the light-emitting device and the first electrochromic device are connected in series.

[0111] It should be noted that the light emitting device and the manner in which the light emitting device and the first electrochromic device are connected in series are consistent with the above description and will not be described in detail herein.

[0112] In one embodiment, the display panel includes a display area and a transparent area, and preparing the first electrochromic device on one side of the substrate includes: preparing the first electrochromic device in the display area.

[0113] In one embodiment, the display panel further includes a second electrochromic device located in the transparent region; after preparing the first electrochromic device on one side of the substrate, the display panel further includes: preparing the second electrochromic device in the transparent region.

[0114] In one embodiment, the first electrochromic device and the second electrochromic device are in the same layer and are spaced apart, and preparing the first electrochromic device on one side of the substrate includes: preparing the first electrochromic device and the second electrochromic device simultaneously on one side of the substrate.

[0115] In a specific embodiment, the method for preparing a display panel includes the following steps:

[0116] 1. In the display area, a first driving circuit is prepared on one side of the substrate.

[0117] 2. Prepare a flat layer on the side of the first driving circuit away from the substrate, set a via in the flat layer, prepare a pixel defining layer on the surface of the flat layer away from the substrate, the pixel defining layer covers the first driving circuit, and the orthographic projection of the pixel defining layer on the substrate covers the orthographic projection of the transparent area on the substrate, and open an opening in the pixel defining layer.

[0118] 3. In the opening of the pixel defining layer, a first electrochromic device is prepared on a side of the first driving circuit away from the substrate, the first electrochromic device extends to the transparent area, the first electrode layer in the first electrochromic device is electrically connected to the first driving circuit through a via, a connecting line connecting the first driving circuit and the first electrochromic device is formed on the first electrode layer of the via, and the orthographic projection of the first electrochromic device on the substrate covers the orthographic projection of the transparent area on the substrate.

[0119] 4. A light-emitting device is prepared on a surface of the first electrochromic device away from the substrate, and the third electrode layer of the light-emitting device and the second electrode layer of the electrochromic device are reused as the same electrode layer.

[0120] Optionally, the first electrochromic device can be manufactured on a glass substrate alone, and then assembled into a box to form the opening of the pixel defining layer. In this case, the first electrochromic device can be manufactured first, and then the connecting wire connecting the first driving circuit and the first electrochromic device can be manufactured. Optionally, the connecting wire connecting the first driving circuit and the first electrochromic device can be manufactured first, and then the first electrochromic device and the second electrochromic device can be manufactured.

[0121] In a specific embodiment, the method for preparing a display panel includes the following steps:

[0122] 1. In the display area, a first driving circuit and a second driving circuit are prepared on one side of the substrate.

[0123] 2. Prepare a flat layer on the side of the first driving circuit and the second driving circuit away from the substrate, set a via in the flat layer, prepare a pixel defining layer on the surface of the flat layer away from the substrate, the flat layer covers the first driving circuit and the second driving circuit, and the orthographic projection of the pixel defining layer on the substrate covers the orthographic projection of the transparent area on the substrate, and open an opening in the pixel defining layer.

[0124] 3. In the opening of the pixel defining layer, on the side of the first driving circuit away from the substrate, a first electrochromic device is prepared in the display area, and a second electrochromic device is prepared in the transparent area, and the orthographic projection of the second electrochromic device on the substrate covers the orthographic projection of the transparent area on the substrate, the first electrode layer in the first electrochromic device is electrically connected to the first driving circuit through a via hole, and a connecting line connecting the first driving circuit and the first electrochromic device is formed in the first electrode layer of the via hole, and the fifth electrode layer in the second electrochromic device is electrically connected to the second driving circuit through a via hole, and a connecting line connecting the second driving circuit and the second electrochromic device is formed in the fifth electrode layer of the via hole. Optionally, the first electrochromic device and the second electrochromic device can be separately manufactured on the glass substrate, and then the box is formed in the opening of the pixel defining layer; in this case, the first electrochromic device and the second electrochromic device can be prepared first, and then the connecting line connecting the first driving circuit and the first electrochromic device and the connecting line connecting the second driving circuit and the second electrochromic device can be prepared. Optionally, a connecting line connecting the first driving circuit and the first electrochromic device and a connecting line connecting the second driving circuit and the second electrochromic device may be prepared first, and then the first electrochromic device and the second electrochromic device may be prepared.

[0125] Optionally, in the process of preparing the first electrochromic device and the second electrochromic device, the first electrode layer and the fifth electrode layer are prepared at the same time, for example, a whole electrode layer is formed first, and the electrode layer is patterned to obtain the first electrode layer and the fifth electrode layer; illustratively, the preparation method of the electrochromic layer of the first electrochromic device and the electrochromic layer of the second electrochromic device, as well as the second electrode layer and the sixth electrode layer can refer to the preparation method of the first electrode layer and the fifth electrode layer, and will not be described in detail here.

[0126] 4. A light-emitting device is prepared on a surface of the first electrochromic device away from the substrate, and the third electrode layer of the light-emitting device and the second electrode layer of the electrochromic device are the same electrode layer.

[0127] A third aspect of the present application provides a display device, which includes: the above-mentioned display panel, or the display panel prepared by the above-mentioned preparation method.

[0128] It can be understood that the display device of the embodiment of the present application may include, in addition to the display panel mentioned above, structures that a conventional display panel should have, such as a driver chip, a housing, etc., which will not be elaborated herein.

[0129] It can be understood that the display device of the embodiment of the present application can be used for color display, black and white display, static display, and dynamic display.

[0130] For example, the display device of the embodiment of the present application can be applied to automobile light curtains or architectural glass, which is beautiful and has excellent display effects.

[0131] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0132] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A display panel, characterized in that: include: substrate; A first electrochromic device, located on one side of the substrate; a light emitting device, located on a side of the first electrochromic device away from the substrate, wherein an orthographic projection of the light emitting device on the substrate partially overlaps with an orthographic projection of the first electrochromic device on the substrate; Wherein, the light-emitting device is connected in series with the first electrochromic device.

2. The display panel according to claim 1, characterized in that: The first electrochromic device comprises a first electrode layer, an electrochromic functional layer and a second electrode layer which are stacked, and the first electrode layer is located on a side of the second electrode layer close to the substrate; The light emitting device comprises a third electrode layer, a light emitting functional layer and a fourth electrode layer which are stacked, wherein the third electrode layer is located on a side of the fourth electrode layer close to the substrate; The second electrode layer and the third electrode layer are reused as the same electrode layer.

3. The display panel according to claim 1, characterized in that: The display panel includes a first driving circuit, which is located on a side of the first electrochromic device close to the substrate, and is electrically connected to the first electrochromic device or the light-emitting device.

4. The display panel according to claim 1, characterized in that: The display panel comprises a display area and a transparent area, and the light emitting device and the first electrochromic device are located in the display area; Preferably, the transparent area surrounds the display area; Preferably, along a direction parallel to the substrate, the first electrochromic device extends to the transparent area; Preferably, the orthographic projection of the first electrochromic device on the substrate covers the orthographic projection of the transparent area on the substrate.

5. The display panel according to claim 1, characterized in that: The display panel comprises a display area and a transparent area, and the display panel further comprises a second electrochromic device located in the transparent area; Preferably, the first electrochromic device and the second electrochromic device are arranged in the same layer and spaced apart; Preferably, the orthographic projection of the second electrochromic device on the substrate covers the orthographic projection of the transparent area on the substrate; Preferably, the display panel further comprises a second driving circuit, the second driving circuit is electrically connected to the second electrochromic device, and the second driving circuit is located on a side of the first electrochromic device close to the substrate; Preferably, the orthographic projection of the second driving circuit on the substrate is located within the orthographic projection range of the display area on the substrate.

6. The display panel according to claim 2, characterized in that: The electrochromic functional layer comprises an electrochromic layer, an ion transport layer and an ion storage layer which are stacked, and the electrochromic layer is located on a side of the ion storage layer away from the second electrode layer; The electrochromic layer includes an inorganic material; Preferably, the electrochromic layer comprises a metal oxide; Preferably, the electrochromic layer includes at least one of tungsten oxide, niobium oxide, titanium oxide, molybdenum oxide, copper oxide, chromium oxide, manganese oxide, vanadium oxide, cobalt oxide and nickel oxide.

7. The display panel according to claim 1, characterized in that: The display panel further comprises a pixel defining layer, the pixel defining layer comprises a plurality of openings, and the light emitting device is located in the openings; The pixel defining layer extends toward the substrate in a direction perpendicular to the substrate, and the first electrochromic device is located in the opening; Preferably, the display panel further comprises a first driving circuit located between the pixel defining layer and the substrate, and the first driving circuit is electrically connected to the first electrochromic device or the light-emitting device; Preferably, the display panel includes a display area and a transparent area, the display panel further includes a second electrochromic device, the light emitting device and the first electrochromic device are located in the display area, and the second electrochromic device is located in the transparent area; The orthographic projection of the pixel defining layer on the substrate covers the orthographic projection of the transparent area on the substrate; The second electrochromic device is located in the pixel defining layer.

8. A method for preparing a display panel, characterized in that: include: preparing a first electrochromic device on one side of the substrate; preparing a light-emitting device on a side of the first electrochromic device away from the substrate; The orthographic projection of the light-emitting device on the substrate partially overlaps with the orthographic projection of the first electrochromic device on the substrate; the light-emitting device and the first electrochromic device are connected in series.

9. The preparation method according to claim 8, characterized in that: The display panel includes a display area and a transparent area, and preparing a first electrochromic device on one side of the substrate includes: preparing the first electrochromic device in the display area; Preferably, the display panel further comprises a second electrochromic device located in the transparent area; after preparing the first electrochromic device on one side of the substrate, the display panel further comprises: preparing the second electrochromic device in the transparent area.

10. A display device, characterized in that: include: The display panel according to any one of claims 1 to 7, or the display panel prepared by the preparation method according to claim 8 or 9.

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