Display panel, display device and preparation method

Abstract

The invention provides a display panel, a display device and a preparation method. The display panel comprises an active light-emitting layer, a first driving circuit, a passive display layer and a second driving circuit, the first driving circuit is used for driving the active light-emitting layer to display; the passive display layer and the active light-emitting layer are oppositely arranged in a spaced mode in the first direction, and the first direction is the stacking direction of the display panel; and the second driving circuit is used for driving the passive display layer to display. According to the display panel provided by the invention, the light-emitting display brightness and contrast of the passive display layer side can be improved on the basis of realizing double-sided display.

Description

Technical Field

[0001] The present application belongs to the field of electronic display technology, and in particular relates to a display panel, a display device, and a manufacturing method thereof. Background Art

[0002] Paper has long been the primary medium for information exchange. However, once printed, text and images cannot be altered, a major drawback of the ink / paper reproduction process. This makes it unable to meet the demands of modern society for rapid information updates. Consequently, the development of high-resolution display technology that can dynamically change has become a sought-after goal. This requires thin, flexible display materials with a surface structure similar to that of paper.

[0003] Thus, electronic paper technology came into being. Electronic paper technology is actually a general term for a category of technologies, also known as E-paper in English. Most of them use electrophoretic display (EPD) technology as a display panel, and their display effect is close to that of natural paper. Electronic paper has a wide range of uses, and can be used to replace the display screens of conventional display devices, display screens of handheld devices such as mobile communications and PDAs, and ultra-thin displays. It can also form application areas related to the printing industry, such as portable e-books, electronic newspapers, and IC cards, which can provide reading functions and usage properties similar to traditional books and periodicals.

[0004] However, most existing electronic paper displays only have a single-sided display function, failing to achieve dual-sided display. Furthermore, due to the thickness and power consumption limitations of single-sided electronic paper, electronic paper lacks a backlight, resulting in poor display brightness and contrast. Therefore, providing a display panel with dual-sided display that can improve both brightness and contrast has become a pressing technical challenge. Summary of the Invention

[0005] In order to address the shortcomings of the prior art, the present application provides a display panel, a display device, and a preparation method that can improve the luminous display brightness and contrast of the passive display layer side on the basis of achieving double-sided display.

[0006] In one aspect, the present application provides a display panel, comprising:

[0007] Active light-emitting layer;

[0008] a first driving circuit, the first driving circuit being used to drive the active light-emitting layer to display;

[0009] a passive display layer, the passive display layer and the active light-emitting layer being arranged opposite to each other and spaced apart along a first direction, the first direction being a stacking direction of the display panel; and

[0010] A second driving circuit is used to drive the passive display layer to display.

[0011] In a possible embodiment, when the second driving circuit drives the passive display layer to display a black screen on the side facing away from the active light-emitting layer, the first driving circuit drives the active light-emitting layer to display an image, and the display panel emits light and displays from the side of the active light-emitting layer facing away from the passive display layer; when the second driving circuit drives the passive display layer to display an image on the side facing away from the active light-emitting layer, the first driving circuit drives the active light-emitting layer to display white light, and the display panel emits light and displays from the side of the passive display layer facing away from the active light-emitting layer.

[0012] In a possible implementation, the display panel further includes a light-transmitting substrate, the first driving circuit and the active light-emitting layer are arranged on one side of the light-transmitting substrate, and the second driving circuit and the passive display layer are arranged on the other side of the light-transmitting substrate.

[0013] In a possible embodiment, the display panel further includes a first light-transmitting substrate, wherein the first light-transmitting substrate and the light-transmitting base layer are spaced apart along the first direction; the first driving circuit includes a first gate, a first insulating layer, a first active layer, a first source and drain electrode, a first planar layer, a first pixel electrode, and a first electrode; the first gate is arranged on a side of the first light-transmitting substrate facing the light-transmitting base layer; the first insulating layer is arranged on a side of the first light-transmitting substrate facing the light-transmitting base layer and covers the first gate; the first active layer is arranged on a side of the first insulating layer facing the light-transmitting base layer; the first source and drain electrode are arranged on a side of the first active layer facing the light-transmitting base layer; the first planar layer is arranged on a side of the first insulating layer facing the light-transmitting base layer and covers the first active layer and the first source and drain electrode; the first pixel electrode is arranged on a side of the first planar layer facing the light-transmitting base layer and contacts the first source and drain electrode; the active light-emitting layer is arranged on a side of the first pixel electrode facing the light-transmitting base layer; The first electrode is arranged on the side of the active light-emitting layer facing the light-transmitting base layer; the second driving circuit includes a second gate, a second insulating layer, a second active layer, a second source and drain, a second flat layer, a second pixel electrode and a second electrode; the second gate is arranged on the side of the light-transmitting base layer facing away from the first light-transmitting substrate; the second insulating layer is arranged on the side of the light-transmitting base layer facing away from the first light-transmitting substrate and covers the second gate; the second active layer is arranged on the side of the second insulating layer facing away from the light-transmitting base layer; the second source and drain are arranged on the side of the second active layer facing away from the light-transmitting base layer; the second flat layer is arranged on the side of the second insulating layer facing away from the light-transmitting base layer and covers the second active layer and the second source and drain; the second pixel electrode is arranged on the side of the second flat layer facing away from the light-transmitting base layer and contacts the second source and drain; the passive display layer is arranged on the side of the second pixel electrode facing away from the light-transmitting base layer; the second electrode is arranged on the side of the passive display layer facing away from the light-transmitting base layer.

[0014] In a possible embodiment, the display panel also includes a first light-transmitting substrate, and the active light-emitting layer and the passive display layer are arranged in sequence on the same side of the first light-transmitting substrate along the first direction; a portion of the first driving circuit is arranged between the first light-transmitting substrate and the active light-emitting layer, and another portion of the first driving circuit is arranged on the side of the active light-emitting layer facing the passive display layer; a portion of the second driving circuit is arranged between the first light-transmitting substrate and the active light-emitting layer, another portion of the second driving circuit is arranged on the side of the passive display layer facing the active light-emitting layer, and another portion of the second driving circuit is arranged on the side of the passive display layer facing away from the active light-emitting layer.

[0015] In a possible embodiment, the display panel further includes an insulating layer and a flat layer that are stacked, and the first light-transmitting substrate, the insulating layer and the flat layer are stacked in sequence along the first direction; the flat layer has a receiving cavity extending along a second direction, and the second direction is perpendicular to the first direction; the first driving circuit includes a first gate, a first active layer, a first source and drain, a first pixel electrode and a first electrode; the first gate is located between the first light-transmitting substrate and the insulating layer; the first active layer is arranged on the side of the insulating layer away from the first light-transmitting substrate; the first source and drain are arranged on the side of the first active layer away from the first light-transmitting substrate; the first pixel electrode is arranged on the inner wall surface of the receiving cavity facing the first light-transmitting substrate and in contact with the first source and drain; the first electrode is arranged on the back of the receiving cavity Towards the inner wall surface of the first light-transmitting substrate and spaced from the first pixel electrode along the first direction; the active light-emitting layer is arranged between the first pixel electrode and the first electrode; the second driving circuit includes a second gate, a second active layer, a second source and drain, a second pixel electrode and a second electrode; the second gate is located between the first light-transmitting substrate and the insulating layer, and the second gate is opposite to the first gate and spaced apart along the second direction; the second active layer is arranged on the side of the insulating layer away from the first light-transmitting substrate; the second source and drain are arranged on the side of the second active layer away from the first light-transmitting substrate; the second pixel electrode is arranged on the side of the passive display layer facing the first light-transmitting substrate and in contact with the first source and drain; the second electrode is arranged on the side of the passive display layer away from the first light-transmitting substrate.

[0016] In one possible embodiment, the active light-emitting layer includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer; along the first direction, the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer and the electron injection layer are stacked in sequence, and the first driving circuit is used to control the hole injection layer to form holes, and to control the electron injection layer to form electrons.

[0017] In one possible embodiment, the passive display layer includes a light-transmitting baffle and electrophoretic particles; the light-transmitting baffle has a plurality of inner cavities, and the opening of each of the inner cavities faces away from the active light-emitting layer; the electrophoretic particles include a plurality of black negatively charged particles and a plurality of white positively charged particles, and each of the inner cavities is provided with the black negatively charged particles and the white positively charged particles; the second driving circuit is used to encapsulate the opening of each of the inner cavities, and to control the movement of the black negatively charged particles and the white positively charged particles in the inner cavities.

[0018] In a second aspect, the present application provides a display device, comprising:

[0019] The display panel mentioned above.

[0020] In a third aspect, the present application provides a preparation method for the above-mentioned display panel, the preparation method comprising:

[0021] providing a first light-transmitting substrate;

[0022] A first driving circuit, an active light-emitting layer, a second driving circuit, and a passive display layer are arranged on the same side of the first light-transmitting substrate, and the passive display layer and the active light-emitting layer are arranged opposite to each other and spaced apart along a first direction; wherein the first direction is a stacking direction of the display panel; and

[0023] A second light-transmitting substrate is provided, and the first driving circuit, the active light-emitting layer, the second driving circuit and the passive display layer are sandwiched between the first light-transmitting substrate and the second light-transmitting substrate.

[0024] The display panel, display device, and preparation method provided by the present application are such that the active light-emitting layer and the passive display layer are arranged opposite to each other and spaced apart along the stacking direction of the display panel, and the first driving circuit drives the active light-emitting layer to emit light and display, and the second driving circuit drives the passive display layer to display. The display panel can drive the active light-emitting layer to emit light and display through the first driving circuit, so that one side of the display panel emits light and display; the display panel can also drive the passive light-emitting layer to emit light and display through the second driving circuit, so that the other side of the display panel emits light and display; thereby, the display panel has the function of double-sided light-emitting display. Moreover, when the second driving circuit drives the passive light-emitting layer to emit light and display, the first driving circuit can simultaneously drive the active light-emitting layer to emit white light, which can improve the brightness and contrast of the light-emitting display of the display panel through the passive light-emitting layer. Therefore, the display panel provided by the present application can improve the brightness and contrast of the light-emitting display on the passive display layer side on the basis of achieving double-sided display. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some implementation methods provided by the embodiments of the present application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0026] Figure 1 is a cross-sectional schematic diagram of a display panel provided in the first embodiment of the present application;

[0027] Figure 2 This is a manufacturing flow chart of a display panel provided in the first embodiment of the present application;

[0028] Figure 3This is a flowchart of another display panel manufacturing method provided in the first embodiment of the present invention;

[0029] Figures 4a to 4x is a cross-sectional schematic diagram of a manufacturing process of a display panel provided in the first embodiment of the present application;

[0030] Figure 5 is a cross-sectional schematic diagram of a display panel provided in the second embodiment of the present application;

[0031] Figure 6 This is a manufacturing flow chart of a display panel provided in the second embodiment of the present application;

[0032] Figures 7a to 7r It is a cross-sectional schematic diagram of a manufacturing process of a display panel provided in the second embodiment of the present application. DETAILED DESCRIPTION

[0033] The technical solution of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0034] The following descriptions of the embodiments are with reference to the attached drawings to illustrate specific embodiments that the present application can be used to implement. The directional terms mentioned in the description of the present application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top surface", "side", "bottom surface", "top wall", "side wall", "bottom wall", "inner side wall", "outer side wall", "length direction", "width direction", "height direction", "X-axis direction", "Y-axis direction", "Z-axis direction", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, for example, "first", "second", "third", "fourth", etc., are only used to distinguish the objects described and do not have any order or technical meaning. In the description of the present application, the "connection" and "connection" involved, unless otherwise specified, include direct connection (connection) and indirect connection (connection).

[0035] The present application provides a display device, comprising a display panel. The display device uses electrophoretic display technology as a display panel, so that the display effect of the display device is close to that of natural paper.

[0036] First embodiment:

[0037] See also Figure 1 , Figure 1 It is a cross-sectional schematic diagram of a display panel provided in the first embodiment of the present application.

[0038] The display panel 10 provided in the first embodiment of the present application includes an active light-emitting layer 11, a first drive circuit 12, a passive display layer 13, and a second drive circuit 14. The passive display layer 13 and the active light-emitting layer 11 are arranged opposite each other along a first direction. The first drive circuit 12 is used to drive the active light-emitting layer 11 to emit light and display, and the second drive circuit 14 is used to drive the passive display layer 13 to display. The first drive circuit 12 and the second drive circuit 14 operate independently and do not interfere with each other. The first direction is the stacking direction of the display panel 10.

[0039] The display panel 10 provided in the first embodiment of the present application has an active light-emitting layer 11 and a passive display layer 13 arranged opposite and spaced apart along the stacking direction of the display panel 10. The first drive circuit 12 drives the active light-emitting layer 11 to emit light, and the second drive circuit 14 drives the passive display layer 13 to emit light. The display panel 10 can drive the active light-emitting layer 11 to emit light through the first drive circuit 12, so that one side of the display panel 10 emits light. The display panel 10 can also drive the passive light-emitting layer 113 to emit light through the second drive circuit 14, so that the other side of the display panel 10 emits light. In this way, the display panel 10 has the function of double-sided light emission. Moreover, when the second drive circuit 14 drives the passive light-emitting layer 113 to emit light, the first drive circuit 12 can simultaneously drive the active light-emitting layer 11 to emit white light, thereby improving the brightness and contrast of the light emission displayed by the passive light-emitting layer 113 on the display panel 10. In other words, the display panel 10 provided in the present application can improve the brightness and contrast of the light emission displayed on the passive display layer 13 side while achieving double-sided display.

[0040] See also Figure 1 In a specific embodiment, the display panel 10 provided in the first embodiment of the present application, in one display state, when the second driving circuit 14 drives the passive display layer 13 to display a black screen on the side facing away from the active light-emitting layer 11, the first driving circuit 12 drives the active light-emitting layer 11 to display an image. Due to the obstruction of the black screen display of the passive display layer 13, the display panel 10 emits light from the side of the active light-emitting layer 11 facing away from the passive display layer 13. In another display state, when the second driving circuit 14 drives the passive display layer 13 to display an image on the side facing away from the active light-emitting layer 11, the first driving circuit 12 drives the active light-emitting layer 11 to display white light. The display panel 10 emits light from the side of the passive display layer 13 facing away from the active light-emitting layer 11. Due to the white light display of the active light-emitting layer 11, the brightness and contrast of the image displayed by the passive display layer 13 can be improved.

[0041] See also Figure 1 In a specific embodiment, the thickness of the active light-emitting layer 11 of the display panel 10 provided in the first embodiment of the present application is less than or equal to 0.05 mm, which is conducive to reducing the thickness of the entire display panel 10. The active light-emitting layer 11 includes a hole injection layer 111, a hole transport layer 112, a light-emitting layer 113, an electron transport layer 114 and an electron injection layer 115. Along the first direction, the hole injection layer 111, the hole transport layer 112, the light-emitting layer 113, the electron transport layer 114 and the electron injection layer 115 are stacked in sequence, and the first driving circuit 12 is used to control the hole injection layer 111 to form holes, and to control the electron injection layer 115 to form electrons. The electrons formed by the electron injection layer 115 and the holes formed by the hole injection layer 111 are injected into the light-emitting layer 113 through the electron transport layer 114 and the hole transport layer 112 respectively to excite the light-emitting material of the light-emitting layer 113 to emit light. The material of the light-emitting layer 113 includes but is not limited to an organic light-emitting material or a quantum dot light-emitting material. For example, the material of the light-emitting layer 113 is any one of a white phosphorescent material, a white fluorescent material, a red, green, and blue phosphorescent material, or a red, green, and blue fluorescent material.

[0042] See also Figure 1 In a specific embodiment, the passive display layer 13 of the display panel 10 provided in the first embodiment of the present application includes a light-transmitting baffle 131 and electrophoretic particles 132, and the passive display layer 13 can be an electronic ink layer. The light-transmitting baffle 131 has a plurality of inner cavities 133, and the opening of each inner cavity 133 faces away from the active light-emitting layer 11. The electrophoretic particles 132 include a plurality of black negatively charged particles 134 and a plurality of white positively charged particles 135, and each inner cavity 133 is provided with black negatively charged particles 134 and white positively charged particles 135. The second driving circuit 14 is used to encapsulate the opening of each inner cavity 133 and control the movement of the black negatively charged particles 134 and the white positively charged particles 135 in the inner cavity 133. When the black negatively charged particles 134 and the white positively charged particles 135 move in the inner cavity 133, the passive light-emitting layer 113 can realize the transformation of images or texts. For example, under the driving action of the second driving circuit 14, the black negatively charged particles 134 and the white positively charged particles 135 can sense the direction and strength of the electric field formed by the second driving circuit 14 and move in different directions. The side where the black negatively charged particles 134 are concentrated can display black, and the opposite side where the white positively charged particles 135 are concentrated can display white. The material of the light-transmitting barrier 131 includes, but is not limited to, a light-transmitting organic material such as PS (polystyrene), PFA (soluble polytetrafluoroethylene), and PI (polyimide), so that the optical fiber can smoothly pass through the light-transmitting barrier 131, thereby increasing the light output brightness of the passive display layer 13 and facilitating the improvement of the luminous display brightness of the passive display layer 13.

[0043] See also Figure 1 In one display state, when the first drive circuit 12 drives the light-emitting layer 113 of the active light-emitting layer 11 to display white light, the display panel 10 emits light from the side of the passive display layer 13 facing away from the active light-emitting layer 11. In this case, the display panel 10 functions as a reader. When the display panel 10 emits light from the side of the passive display layer 13 facing away from the active light-emitting layer 11 when used as a reader, the white light of the active light-emitting layer 11 serves as the backplane of the passive display layer 13, thereby improving the brightness and contrast of the image displayed on the passive display layer 13 when used as a reader.

[0044] The light-emitting layer 113 can emit white light using a white light material, i.e., the material of the light-emitting layer 113 is a white phosphorescent material or a white fluorescent material. The light-emitting layer 113 can also emit white light using a mixture of red, green, and blue light materials, i.e., the material of the light-emitting layer 113 is a red, green, and blue phosphorescent material or a red, green, and blue fluorescent material.

[0045] See also Figure 1 In another display state, when the second drive circuit 14 drives the passive display layer 13 to display a black screen on the side facing away from the active light-emitting layer 11, or when the second drive circuit 14 is not driving the passive display layer 13, the display panel 10 emits light from the side of the active light-emitting layer 11 facing away from the passive display layer 13 to display as an OLED screen (organic light-emitting display). When the display panel 10 emits light from the side of the active light-emitting layer 11 facing away from the passive display layer 13 to display as an OLED screen, the backlight structure of the black screen display of the passive display layer 13 blocks the display, which can improve the display effect of the active light-emitting layer 11 when used as an OLED screen.

[0046] The light-emitting layer 113 may emit red, green, and blue light for image display. The material of the light-emitting layer 113 may be a mixture of red, green, and blue light materials to emit mixed light, that is, the material of the light-emitting layer 113 may be a red, green, and blue phosphorescent material or a red, green, and blue fluorescent material.

[0047] By adding the active light-emitting layer 11 to the display panel 10 as a backlight structure for the passive display layer 13, a double-sided light-emitting display effect can be achieved for the display panel 10, and the overall structure of the display panel 10 is relatively thin, which facilitates lightweighting of the display panel 10. Moreover, compared to a conventional backlight structure in which an LED lamp is used as a backlight structure for the passive display layer 13, the display panel 10 formed by the active light-emitting layer 11 as a backlight structure for the passive display layer 13 has lower costs. Compared to a conventional backlight structure in which a fluorescent lamp is used as a backlight structure for the passive display layer 13, the display panel 10 formed by the active light-emitting layer 11 as a backlight structure for the passive display layer 13 has lower power consumption.

[0048] See also Figure 1In a specific embodiment, the display panel 10 provided in the first embodiment of the present application includes an active light-emitting layer 11, a first driving circuit 12, a passive display layer 13, a second driving circuit 14, a first light-transmitting substrate 15, a light-transmitting base layer 16, and a second light-transmitting substrate 17. The first light-transmitting substrate 15, the light-transmitting base layer 16, and the second light-transmitting substrate 17 are arranged in sequence along a first direction. The first driving circuit 12 and the active light-emitting layer 11 are arranged between the first light-transmitting substrate 15 and the light-transmitting base layer 16, and the second driving circuit 14 and the passive display layer 13 are arranged between the light-transmitting base layer 16 and the second light-transmitting substrate 17. By arranging the first driving circuit 12 and the second driving circuit 14 in different layers, it is beneficial to improve the overall aperture ratio of the display panel 10, that is, to improve the ability of the display panel 10 to emit light.

[0049] See also Figure 1 In a specific embodiment, the first driving circuit 12 of the display panel 10 provided in the first embodiment of the present application includes a first gate 121, a first insulating layer 122, a first active layer 123, a first source and drain 124, a first flat layer 125, a first pixel electrode 126 and a first electrode 127. The first driving circuit 12 can be a TFT driving circuit.

[0050] The first gate 121 is disposed on the side of the first light-transmitting substrate 15 facing the light-transmitting base layer 16 . The material of the first gate 121 includes but is not limited to one metal selected from conductive materials such as Cu (copper), Al (aluminum), Mo (molybdenum), and Ti (titanium), or a structure formed by a composite of multiple metals.

[0051] The first insulating layer 122 is disposed on a side of the first light-transmitting substrate 15 facing the light-transmitting base layer 16 and covers the first gate 121 . The material of the first insulating layer 122 includes but is not limited to insulating and light-transmitting materials such as SiO 2 .

[0052] The first active layer 123 is disposed on the side of the first insulating layer 122 facing the light-transmitting base layer 16. The material of the first active layer 123 includes, but is not limited to, low-temperature polysilicon (LTPS), with a thickness of 300 to 700 angstroms. The LTSPS fabrication process for the first active layer 123 includes: first, depositing a layer of A-Si (amorphous silicon), then crystallizing it using laser annealing to form polysilicon. After the polysilicon is prepared, a masking process is used to dope the source and drain electrodes.

[0053] The first source and drain electrodes 124 are disposed on a side of the first active layer 123 facing the light-transmitting base layer 16 . The material of the first source and drain electrodes 124 includes but is not limited to one metal or a composite structure of multiple metals selected from conductive materials such as Cu, Al, Mo, and Ti.

[0054] The first planar layer 125 is disposed on a side of the first insulating layer 122 facing the light-transmitting base layer 16 and covers the first active layer 123 and the first source and drain electrodes 124 . The first planar layer 125 is made of a light-transmitting material.

[0055] The first pixel electrode 126 is disposed on the side of the first planar layer 125 facing the light-transmitting base layer 16 . The first pixel electrode 126 penetrates the first planar layer 125 and contacts the first source and drain electrodes 124 . The material of the first pixel electrode 126 includes, but is not limited to, a transparent conductive material such as indium tin oxide (ITO), which has high light transmittance and good conductivity. The first pixel electrode 126 serves as the anode of the first driving circuit 12 .

[0056] The active light emitting layer 11 is disposed on a side of the first pixel electrode 126 facing the light-transmitting base layer 16 , and the hole injection layer 111 of the active light emitting layer 11 is in contact with the first pixel electrode 126 .

[0057] The first electrode 127 is disposed on the side of the active light-emitting layer 11 facing the light-transmitting base layer 16. The material of the first electrode 127 includes, but is not limited to, a transparent conductive material such as indium tin oxide, which has high light transmittance and good conductivity. The first electrode 127 serves as the cathode of the first driving circuit 12. The electron injection layer 115 of the active light-emitting layer 11 contacts the first electrode 127.

[0058] The first driving circuit 12 is used to control the light emission regulation of the light emitting layer 113 of the active light emitting layer 11 so as to adjust the light emission brightness according to the requirements of the usage scenario.

[0059] It is understood that, in this embodiment, the first driving circuit 12 is a bottom-gate structure. In some other embodiments, the first driving circuit 12 may be a top-gate structure, which is not limited in this application.

[0060] See also Figure 1 The second driving circuit 14 of the display panel 10 provided in the first embodiment of the present application includes a second gate 141, a second insulating layer 142, a second active layer 143, a second source and drain 144, a second flat layer 145, a second pixel electrode 146 and a second electrode 147. The second driving circuit 14 can be a TFT driving circuit.

[0061] The second gate 141 is disposed on the side of the light-transmitting base layer 16 facing away from the first light-transmitting substrate 15 . The material of the second gate 141 includes but is not limited to one metal or a composite structure of multiple metals selected from conductive materials such as Cu, Al, Mo, and Ti.

[0062] The second insulating layer 142 is disposed on the side of the light-transmitting base layer 16 facing away from the first light-transmitting substrate 15 and covers the second gate 141 . The material of the second insulating layer 142 includes but is not limited to insulating and light-transmitting materials such as SiO 2 (silicon dioxide).

[0063] The second active layer 143 is disposed on the side of the second insulating layer 142 facing away from the light-transmitting base layer 16. The material of the second active layer 143 includes, but is not limited to, low-temperature polysilicon (LTPS) with a thickness of 400 to 900 angstroms. The LTSPS fabrication process for the second active layer 143 includes first depositing a layer of A-Si (amorphous silicon), then crystallizing it using laser annealing to form polysilicon. After the polysilicon is prepared, a masking process is used to dope the source and drain electrodes.

[0064] The second source-drain electrode 144 is disposed on the side of the second active layer 143 facing away from the light-transmitting base layer 16 . The material of the second source-drain electrode 144 includes but is not limited to one metal or a composite structure of multiple metals selected from conductive materials such as Cu, Al, Mo, and Ti.

[0065] The second planar layer 145 is disposed on a side of the second insulating layer 142 facing away from the light-transmitting base layer 16 and covers the second active layer 143 and the second source and drain electrodes 144 . The second planar layer 145 is made of a light-transmitting material.

[0066] The second pixel electrode 146 is arranged on the side of the second flat layer 145 facing away from the light-transmitting base layer 16. The second pixel electrode 146 penetrates the second flat layer 145 and contacts the second source and drain electrodes 144. The material of the second pixel electrode 146 includes but is not limited to transparent conductive materials such as indium tin oxide, which has high light transmittance and good conductivity.

[0067] The passive display layer 13 is disposed on a side of the second pixel electrode 146 facing away from the light-transmitting base layer 16 , and one side of the passive display layer 13 is in contact with the second pixel electrode 146 .

[0068] A second electrode 147 is disposed on the side of the passive display layer 13 facing away from the light-transmitting base layer 16. The second electrode 147 also serves to encapsulate the passive display layer 13. The material of the second electrode 147 includes, but is not limited to, a transparent conductive material such as indium tin oxide (ITO), which has high light transmittance and good electrical conductivity. The other side of the passive display layer 13 contacts the second electrode 147.

[0069] It is understood that in this embodiment, the second driving circuit 14 is a bottom-gate structure. In some other embodiments, the first driving circuit 12 can be a top-gate structure, which is not limited in this application.

[0070] It should be understood that in the display panel 10 provided in the first embodiment of the present application, the first gate 121, the first active layer 123, and the first source-drain electrode 124 of the first driving circuit 12, as well as the second gate 141, the second active layer 143, and the second source-drain electrode 144 of the second driving circuit 14, are all arranged relative to each other along the first direction. This further increases the aperture ratio of the display panel 10, that is, further improves the light-emitting capability of the display panel 10.

[0071] See also Figure 1 and Figure 2 , Figure 2 This is a manufacturing flow chart of a display panel provided in the first embodiment of the present application.

[0072] A manufacturing method provided in the first embodiment of the present application is used to manufacture the display panel 10 provided in the first embodiment of the present application. The manufacturing method includes:

[0073] S11: providing a first light-transmitting substrate 15;

[0074] S12: Disposing a first driving circuit 12, an active light-emitting layer 11, a second driving circuit 14, and a passive display layer 13 on the same side of a first light-transmitting substrate 15; and disposing the passive display layer 13 and the active light-emitting layer 11 opposite to each other and spaced apart along a first direction; wherein the first direction is a stacking direction of the display panel 10;

[0075] S13 : providing a second light-transmitting substrate 17 , and sandwiching the first driving circuit 12 , the active light-emitting layer 11 , the second driving circuit 14 and the passive display layer 13 between the first light-transmitting substrate 15 and the second light-transmitting substrate 17 .

[0076] The first drive circuit 12, active light-emitting layer 11, second drive circuit 14, and passive display layer 13 are sandwiched between a first light-transmitting substrate 15 and a second light-transmitting substrate 17. The active light-emitting layer 11 and the passive display layer 13 are arranged opposite and spaced apart along the stacking direction of the display panel 10. The first drive circuit 12 drives the active light-emitting layer 11 to emit light, while the second drive circuit 14 drives the passive display layer 13 to emit light. The display panel 10 can drive the active light-emitting layer 11 to emit light via the first drive circuit 12, causing one side of the display panel 10 to emit light. The display panel 10 can also drive the passive light-emitting layer 113 to emit light via the second drive circuit 14, causing the other side of the display panel 10 to emit light. This enables the display panel 10 to have dual-sided light-emitting capabilities. Furthermore, when the second drive circuit 14 drives the passive light-emitting layer 113 to emit light, the first drive circuit 12 can simultaneously drive the active light-emitting layer 11 to emit white light, thereby improving the brightness and contrast of the light emitted by the passive light-emitting layer 113 on the display panel 10.

[0077] It is understandable that the method for preparing the display panel 10 is not limited to the above steps, and the display panel 10 can also be prepared by other steps, and this application does not impose any limitation on this.

[0078] See also Figure 1 and Figure 3 , Figure 3 This is a manufacturing flow chart of another display panel provided in the first embodiment of the present application.

[0079] Another manufacturing method provided in the first embodiment of the present application is used to manufacture the display panel 10 provided in the first embodiment of the present application. The manufacturing method includes:

[0080] S21: providing a first light-transmitting substrate 15;

[0081] S22: Disposing a first driving circuit 12 and an active light-emitting layer 11 on the same side of the first light-transmitting substrate 15;

[0082] S23: providing a light-transmitting base layer 16, and sandwiching the first driving circuit 12 and the active light-emitting layer 11 between the first light-transmitting substrate 15 and the light-transmitting base layer 16;

[0083] S24: Disposing a second driving circuit 14 and a passive display layer 13 on a side of the light-transmitting base layer 16 facing away from the first light-transmitting substrate 15, and disposing the passive display layer 13 and the active light-emitting layer 11 opposite to each other and spaced apart along a first direction; wherein the first direction is a stacking direction of the display panel 10;

[0084] S25 : providing a second light-transmitting substrate 17 , and sandwiching the second driving circuit 14 and the passive display layer 13 between the light-transmitting base layer 16 and the second light-transmitting substrate 17 .

[0085] The first drive circuit 12, active light-emitting layer 11, second drive circuit 14, and passive display layer 13 are sandwiched between a first light-transmitting substrate 15 and a second light-transmitting substrate 17. The first drive circuit 12 and active light-emitting layer 11 are sandwiched between the first light-transmitting substrate 15 and the light-transmitting base layer 16, while the second drive circuit 14 and passive display layer 13 are sandwiched between the light-transmitting base layer 16 and the second light-transmitting substrate 17. Furthermore, the active light-emitting layer 11 and the passive display layer 13 are arranged opposite and spaced apart along the stacking direction of the display panel 10. The first drive circuit 12 drives the active light-emitting layer 11 to emit light, while the second drive circuit 14 drives the passive display layer 13 to emit light. The display panel 10 can use the first drive circuit 12 to drive the active light-emitting layer 11 to emit light, causing one side of the display panel 10 to emit light. The display panel 10 can also use the second drive circuit 14 to drive the passive light-emitting layer 113 to emit light, causing the other side of the display panel 10 to emit light. This enables the display panel 10 to have dual-sided light-emitting capabilities. Moreover, when the second driving circuit 14 drives the passive light-emitting layer 113 to emit light for display, the first driving circuit 12 can simultaneously drive the active light-emitting layer 11 to emit white light, thereby improving the brightness and contrast of the display panel 10 through the passive light-emitting layer 113 .

[0086] It is understood that the method for manufacturing the display panel 10 is not limited to the above steps, and the display panel 10 can also be manufactured using other steps, and this application does not impose any restrictions on this. For example, the second driving circuit 14 and the passive light-emitting layer 113 can first be made into a stacked structure sandwiched between a light-transmitting base layer 16 and a second light-transmitting substrate 17, and then this stacked structure is stacked with the first driving circuit 12 and the active light-emitting layer 11 manufactured on the first light-transmitting base layer 16 to form a panel structure.

[0087] See also Figure 1 and Figures 4a to 4x , Figures 4a to 4x It is a cross-sectional schematic diagram of a manufacturing process of a display panel provided in the first embodiment of the present application.

[0088] Arranging the first driving circuit 12 and the active light-emitting layer 11 on the same side of the first light-transmitting substrate 15 includes the following steps:

[0089] A first light-transmitting substrate 15 is provided.

[0090] A first gate electrode 121 is disposed on a side of the first light-transmitting substrate 15 facing the light-transmitting base layer 16 .

[0091] A first insulating layer 122 is disposed on a side of the first light-transmitting substrate 15 facing the first gate electrode 121 , and the first insulating layer 122 covers the first gate electrode 121 .

[0092] A first active layer 123 is disposed on a side of the first insulating layer 122 facing away from the first light-transmitting substrate 15 .

[0093] A first source and drain electrode 124 is disposed on a side of the first active layer 123 facing away from the first light-transmitting substrate 15 .

[0094] A first planarization layer 125 is disposed on a side of the first source / drain electrodes 124 facing away from the first light-transmitting substrate 15 , and the first planarization layer 125 covers the first source / drain electrodes 124 .

[0095] The first pixel electrode 126 is disposed on a side of the first planar layer 125 facing away from the first light-transmitting substrate 15 , and the first pixel electrode 126 is in contact with the first source and drain electrodes 124 after passing through the first planar layer 125 .

[0096] A hole injection layer 111 is disposed on a side of the first pixel electrode 126 facing away from the first light-transmitting substrate 15 .

[0097] A hole transport layer 112 is disposed on the side of the hole injection layer 111 facing away from the first light-transmitting substrate 15 .

[0098] The light-emitting layer 113 is disposed on the side of the hole transport layer 112 facing away from the first light-transmitting substrate 15 .

[0099] An electron transport layer 114 is disposed on the side of the light emitting layer 113 facing away from the first light-transmitting substrate 15 .

[0100] An electron injection layer 115 is disposed on a side of the electron transport layer 114 facing away from the first light-transmitting substrate 15 .

[0101] A first electrode 127 is disposed on a side of the electron injection layer 115 facing away from the first light-transmitting substrate 15 .

[0102] Thus, a stacked structure of the first light-transmitting substrate 15 , the first driving circuit 12 and the active light-emitting layer 11 is prepared.

[0103] Arranging the second driving circuit 14 and the passive display layer 13 on the side of the light-transmitting base layer 16 facing away from the first light-transmitting substrate 15 includes the following steps:

[0104] A light-transmitting base layer 16 is provided and is stacked on a side of the first electrode 127 facing away from the first light-transmitting substrate 15 .

[0105] A second gate 141 is provided on the side of the light-transmitting base layer 16 facing away from the first light-transmitting substrate 15;

[0106] A second insulating layer 142 is disposed on a side of the light-transmitting base layer 16 facing the second gate electrode 141 , and the second insulating layer 142 covers the second gate electrode 141 .

[0107] A second active layer 143 is disposed on a side of the second insulating layer 142 facing away from the light-transmitting base layer 16 .

[0108] A second source and drain electrode 144 is disposed on a side of the second active layer 143 facing away from the light-transmitting base layer 16 .

[0109] A second planarization layer 145 is disposed on a side of the second source / drain electrodes 144 facing away from the light-transmitting base layer 16 , and the second planarization layer 145 covers the second source / drain electrodes 144 .

[0110] The second pixel electrode 146 is disposed on a side of the second planar layer 145 facing away from the light-transmitting base layer 16 , and the second pixel electrode 146 is in contact with the second source and drain electrodes 144 after passing through the second planar layer 145 .

[0111] A light-transmitting barrier 131 is disposed on a side of the second pixel electrode 146 facing away from the light-transmitting base layer 16 .

[0112] A plurality of inner cavities 133 are disposed on a side of the light-transmitting barrier 131 facing away from the light-transmitting base layer 16 , and an opening of each inner cavity 133 faces away from the light-transmitting base layer 16 .

[0113] The electrophoretic particles 132 are filled into each inner cavity 133 , and each inner cavity 133 is provided with black negatively charged particles 134 and white positively charged particles 135 .

[0114] A second electrode 147 is disposed on a side of the light-transmitting barrier 131 facing away from the light-transmitting base layer 16 , and the second electrode 147 blocks the opening of each inner cavity 133 .

[0115] Thus, the stacked structure of the light-transmitting base layer 16 , the second driving circuit 14 and the passive display layer 13 is prepared.

[0116] After the first light-transmitting substrate 15, the first driving circuit 12, the active light-emitting layer 11, the light-transmitting base layer 16, the second driving circuit 14 and the passive display layer 13 form a stacked structure, a second light-transmitting substrate 17 is arranged on the side of the second electrode 147 facing away from the light-transmitting base layer 16, thereby completing the preparation of the display panel 10.

[0117] Second embodiment:

[0118] See also Figure 5 , Figure 5 It is a cross-sectional schematic diagram of a display panel provided in the second embodiment of the present application.

[0119] The display panel 30 provided in the second embodiment of the present application includes an active light-emitting layer 31, a first drive circuit 32, a passive display layer 33, a second drive circuit 34, and a first light-transmitting substrate 35. The active light-emitting layer 31, the first drive circuit 32, the passive display layer 33, and the second drive circuit 34 are all arranged on the same side of the first light-transmitting substrate 35. The active light-emitting layer 31 and the passive display layer 33 are sequentially arranged on the same side of the first light-transmitting substrate 35 along a first direction. The first direction is the stacking direction of the display panel 30. A portion of the first drive circuit 32 is arranged between the first light-transmitting substrate 35 and the active light-emitting layer 31, and another portion of the first drive circuit 32 is arranged on the side of the active light-emitting layer 31 facing the passive display layer 33. A portion of the second drive circuit 34 is arranged between the first light-transmitting substrate 35 and the active light-emitting layer 31, another portion of the second drive circuit 34 is arranged on the side of the passive display layer 33 facing the active light-emitting layer 31, and another portion of the second drive circuit 34 is arranged on the side of the passive display layer 33 facing away from the active light-emitting layer 31.

[0120] See also Figure 5 The display panel 30 provided in the second embodiment of the present application has an active light-emitting layer 31 and a passive display layer 33 arranged opposite each other and spaced apart along the stacking direction of the display panel 30. A first drive circuit 32 drives the active light-emitting layer 31 to emit light, while a second drive circuit 34 drives the passive display layer 33 to emit light. The display panel 30 can drive the active light-emitting layer 31 to emit light via the first drive circuit 32, thereby emitting light on one side of the display panel 30. The display panel 30 can also drive the passive light-emitting layer 313 to emit light via the second drive circuit 34, thereby emitting light on the other side of the display panel 30. This enables the display panel 30 to have a dual-sided display function. Furthermore, when the second drive circuit 34 drives the passive light-emitting layer 313 to emit light, the first drive circuit 32 can simultaneously drive the active light-emitting layer 31 to emit white light, thereby improving the brightness and contrast of the light displayed by the passive light-emitting layer 313 on the display panel 30. In other words, the display panel 30 provided in the present application can achieve a dual-sided display while also improving the brightness and contrast of the light displayed on the passive display layer 33 side.

[0121] See also Figure 5In a specific embodiment, the display panel 30 provided in the second embodiment of the present application, in one display state, when the second drive circuit 34 drives the passive display layer 33 to display a black screen on the side facing away from the active light-emitting layer 31, the first drive circuit 32 drives the active light-emitting layer 31 to display an image. Due to the obstruction of the black screen display of the passive display layer 33, the display panel 30 emits light from the side of the active light-emitting layer 31 facing away from the passive display layer 33. In another display state, when the second drive circuit 34 drives the passive display layer 33 to display an image on the side facing away from the active light-emitting layer 31, the first drive circuit 32 drives the active light-emitting layer 31 to display white light. The display panel 30 emits light from the side of the passive display layer 33 facing away from the active light-emitting layer 31. Due to the white light display of the active light-emitting layer 31, the brightness and contrast of the image displayed by the passive display layer 33 can be improved.

[0122] See also Figure 5 In a specific embodiment, the thickness of the active light-emitting layer 31 of the display panel 30 provided in the second embodiment of the present application is less than or equal to 0.05 mm, which is conducive to reducing the thickness of the entire display panel 30. The active light-emitting layer 31 includes a hole injection layer 311, a hole transport layer 312, a light-emitting layer 313, an electron transport layer 314 and an electron injection layer 315. Along the first direction, the hole injection layer 311, the hole transport layer 312, the light-emitting layer 313, the electron transport layer 314 and the electron injection layer 315 are stacked in sequence, and the first driving circuit 32 is used to control the hole injection layer 311 to form holes and control the electron injection layer 315 to form electrons. The electrons formed by the electron injection layer 315 and the holes formed by the hole injection layer 311 are respectively injected into the light-emitting layer 313 through the electron transport layer 314 and the hole transport layer 312 to excite the light-emitting material of the light-emitting layer 313 to emit light. The material of the light-emitting layer 313 includes but is not limited to an organic light-emitting material or a quantum dot light-emitting material. For example, the material of the light-emitting layer 313 is any one of a white phosphorescent material, a white fluorescent material, a red, green, and blue phosphorescent material, or a red, green, and blue fluorescent material.

[0123] See also Figure 5In a specific embodiment, the passive display layer 33 of the display panel 30 provided in the second embodiment of the present application includes a light-transmitting baffle 331 and electrophoretic particles 332, and the passive display layer 13 can be an electronic ink layer. The light-transmitting baffle 331 has a plurality of inner cavities 333, and the opening of each inner cavity 333 faces away from the active light-emitting layer 31. The electrophoretic particles 332 include a plurality of black negatively charged particles 334 and a plurality of white positively charged particles 335, and each inner cavity 333 is provided with black negatively charged particles 334 and white positively charged particles 335. The second driving circuit 34 is used to encapsulate the opening of each inner cavity 333 and control the movement of the black negatively charged particles 334 and the white positively charged particles 335 in the inner cavity 333. When the black negatively charged particles 334 and the white positively charged particles 335 move in the inner cavity 333, the passive light-emitting layer 313 can realize the transformation of images or texts. For example, under the drive of the second drive circuit 34, the black negatively charged particles 334 and the white positively charged particles 335 can sense the direction and strength of the electric field formed by the second drive circuit 34 and move in different directions. The side where the black negatively charged particles 334 are concentrated can display black, while the opposite side where the white positively charged particles 335 are concentrated can display white. The material of the light-transmitting barrier 331 includes, but is not limited to, a light-transmitting organic material such as PS (polystyrene), PFA (soluble polytetrafluoroethylene), and PI (polyimide). This allows the optical fiber to smoothly pass through the light-transmitting barrier 331, thereby increasing the light output brightness of the passive display layer 33 and facilitating the improvement of the luminous display brightness of the passive display layer 33.

[0124] See also Figure 5 In one display state, when the first drive circuit 32 drives the light-emitting layer 313 of the active light-emitting layer 31 to display white light, the display panel 30 emits light from the side of the passive display layer 33 facing away from the active light-emitting layer 31. In this case, the display panel 30 functions as a reader. When the display panel 30 emits light from the side of the passive display layer 33 facing away from the active light-emitting layer 31 when used as a reader, the white light of the active light-emitting layer 31 serves as the backplane of the passive display layer 33, thereby improving the brightness and contrast of the image displayed on the passive display layer 33 when used as a reader.

[0125] The light-emitting layer 313 can emit white light using a white light material, i.e., the material of the light-emitting layer 313 is a white phosphorescent material or a white fluorescent material. The light-emitting layer 313 can also emit white light using a mixture of red, green, and blue light materials, i.e., the material of the light-emitting layer 313 is a red, green, and blue phosphorescent material or a red, green, and blue fluorescent material.

[0126] See also Figure 5In another display state, when the second drive circuit 34 drives the passive display layer 33 to display a black screen on the side facing away from the active light-emitting layer 31, or when the second drive circuit 34 is not driving the passive display layer 33, the display panel 30 emits light from the side of the active light-emitting layer 31 facing away from the passive display layer 33 to display as an OLED screen (organic light-emitting display). When the display panel 30 emits light from the side of the active light-emitting layer 31 facing away from the passive display layer 33 to display as an OLED screen, the backlight structure of the black screen display of the passive display layer 33 blocks the display, which can improve the display effect of the active light-emitting layer 31 when used as an OLED screen.

[0127] The light-emitting layer 313 may emit red, green and blue light for image display. The material of the light-emitting layer 313 may be a mixture of red, green and blue light materials to emit mixed light, that is, the material of the light-emitting layer 313 may be a red, green and blue phosphorescent material or a red, green and blue fluorescent material.

[0128] By incorporating an active light-emitting layer 31 into the display panel 30 as a backlight structure for the passive display layer 33, a double-sided light-emitting display effect can be achieved for the display panel 30. Furthermore, the overall structure of the display panel 30 is relatively thin, facilitating lightweighting of the display panel 30. Furthermore, compared to conventional backlight structures in which LED lamps serve as the backlight structure for the passive display layer 33, the display panel 30 in which the active light-emitting layer 31 serves as the backlight structure for the passive display layer 33 is less expensive. Compared to conventional backlight structures in which fluorescent lamps serve as the backlight structure for the passive display layer 33, the display panel 30 in which the active light-emitting layer 31 serves as the backlight structure for the passive display layer 33 consumes less power.

[0129] See also Figure 5 In a specific embodiment, the display panel 30 provided in the second embodiment of the present application includes an active light-emitting layer 31, a first driving circuit 32, a passive display layer 33, a second driving circuit 34, a first light-transmitting substrate 35, and a second light-transmitting substrate 36. The first light-transmitting substrate 35 and the second light-transmitting substrate 36 are arranged in sequence along the first direction, and the active light-emitting layer 31, the first driving circuit 32, the passive display layer 33, and the second driving circuit 34 are arranged between the first light-transmitting substrate 35 and the second light-transmitting substrate 36. Among them, at least part of the first driving circuit 32 and at least part of the second driving circuit 34 are arranged side by side along the second direction, and the second direction is perpendicular to the first direction, that is, at least part of the first driving circuit 32 and at least part of the second driving circuit 34 are arranged in the same layer. By arranging at least part of the first driving circuit 32 and at least part of the second driving circuit 34 in the same layer, the overall thickness of the display panel 30 can be reduced, which is conducive to the miniaturization and thinning of the display panel 30.

[0130] See also Figure 5In a specific embodiment, the second embodiment of the present application provides a display panel 30 that further includes an insulating layer 37 and a flat layer 38 that are stacked, and a first light-transmitting substrate 35, an insulating layer 37, a flat layer 38, and a second light-transmitting substrate 36 are stacked in sequence along a first direction. At least a portion of the first drive circuit 32 and at least a portion of the second drive circuit 34 are disposed between the first light-transmitting substrate 35 and the insulating layer 37, so that at least a portion of the first drive circuit 32 and at least a portion of the second drive circuit 34 are disposed in a structure on the same layer. The flat layer 38 has a receiving cavity extending along a second direction, and the active light-emitting layer 31 and at least a portion of the first drive circuit 32 are disposed within the receiving cavity. The second direction is perpendicular to the first direction.

[0131] See also Figure 5 In the second embodiment of the present application, a first driving circuit 32 of a display panel 30 includes a first gate 321, a first active layer 322, a first source and drain 323, a first pixel electrode 324 and a first electrode 325. The first driving circuit 32 can be a TFT driving circuit.

[0132] The first gate 321 is located between the first light-transmitting substrate 35 and the insulating layer 37 . The material of the first gate 321 includes but is not limited to one metal selected from conductive materials such as Cu (copper), Al (aluminum), Mo (molybdenum), and Ti (titanium), or a structure formed by a composite of multiple metals.

[0133] The first active layer 322 is disposed on the side of the insulating layer 37 facing away from the first light-transmitting substrate 35. The first active layer 322 and the first gate 321 are arranged opposite each other along a first direction. The material of the first active layer 322 includes, but is not limited to, low-temperature polysilicon (LTPS), with a thickness of 300 to 700 angstroms. The LTS polysilicon fabrication process for the first active layer 322 includes: first depositing a layer of A-Si (amorphous silicon), then crystallizing it using laser annealing to form polysilicon. After the polysilicon is prepared, a masking process is used to further dope the source and drain electrodes.

[0134] The first source and drain electrodes 323 are disposed on a side of the first active layer 322 facing away from the first light-transmitting substrate 35. The first source and drain electrodes 323 are disposed opposite the first gate electrode 321 along a first direction. The material of the first source and drain electrodes 323 includes, but is not limited to, one metal selected from conductive materials such as Cu, Al, Mo, and Ti, or a composite structure formed by multiple metals.

[0135] The first pixel electrode 324 is disposed on the inner wall of the cavity of the planar layer 38, facing the first light-transmitting substrate 35. The first pixel electrode 324 penetrates the planar layer 38 and contacts the first source and drain electrodes 323. The material of the first pixel electrode 324 includes, but is not limited to, a transparent conductive material such as indium tin oxide, which has high light transmittance and good conductivity. The first pixel electrode 324 serves as the anode of the first driving circuit 32.

[0136] The first electrode 325 is disposed on the inner wall of the cavity of the planar layer 38, facing away from the first light-transmitting substrate 35. The first electrode 325 is spaced apart from the first pixel electrode 324 along a first direction. The material of the first electrode 325 includes, but is not limited to, a transparent conductive material such as indium tin oxide, which has high light transmittance and good conductivity. The first electrode 325 serves as the cathode of the first driving circuit 32.

[0137] The active light emitting layer 31 is disposed between the first pixel electrode 324 and the first electrode 325 . The hole injection layer 311 of the active light emitting layer 31 contacts the first pixel electrode 324 , and the electron injection layer 315 of the active light emitting layer 31 contacts the first electrode 325 .

[0138] It is understood that, in this embodiment, the first driving circuit 32 is a bottom-gate structure. In some other embodiments, the first driving circuit 32 may be a top-gate structure, which is not limited in this application.

[0139] See also Figure 5 In the second embodiment of the present application, a second driving circuit 34 of a display panel 30 includes a second gate 341 , a second active layer 342 , a second source and drain 343 , a second pixel electrode 344 and a second electrode 345 . The second driving circuit 34 may be a TFT driving circuit.

[0140] The second gate 341 is located between the first light-transmitting substrate 35 and the insulating layer 37, and is spaced apart from and opposite to the first gate 321 along the second direction. The material of the second gate 341 includes, but is not limited to, one metal selected from conductive materials such as Cu, Al, Mo, and Ti, or a composite structure of multiple metals.

[0141] The second active layer 342 is disposed on the side of the insulating layer 37 facing away from the first light-transmitting substrate 35. The second active layer 342 and the second gate 341 are disposed opposite each other along a first direction, and the second active layer 342 is spaced apart from each other along a second direction. The material of the second active layer 342 includes, but is not limited to, low-temperature polysilicon (LTPS), with a thickness of 400 to 900 angstroms. The low-temperature polysilicon preparation process for the second active layer 342 includes: first, depositing a layer of A-Si (amorphous silicon), then crystallizing it using laser annealing to form polysilicon. After the polysilicon is prepared, a masking process is used to dope the source and drain electrodes.

[0142] The second source / drain electrodes 343 are disposed on a side of the second active layer 342 facing away from the first light-transmitting substrate 35. The second source / drain electrodes 343 and the second gate electrode 341 are disposed opposite each other along the first direction. The second source / drain electrodes 343 and the first source / drain electrodes 323 are spaced apart along the second direction. The material of the second source / drain electrodes 343 includes, but is not limited to, a single metal selected from conductive materials such as Cu, Al, Mo, and Ti, or a composite structure formed by multiple metals.

[0143] The second pixel electrode 344 is disposed on a side of the passive display layer 33 facing the first light-transmitting substrate 35. The second pixel electrode 344 penetrates the planar layer 38 and contacts the second source and drain electrodes 343. The material of the second pixel electrode 344 includes, but is not limited to, a transparent conductive material such as indium tin oxide, which has high light transmittance and good conductivity.

[0144] The second electrode 345 is disposed on the side of the passive display layer 33 facing away from the first light-transmitting substrate 35 and is also used to encapsulate the passive display layer 33. The material of the second electrode 345 includes but is not limited to transparent conductive materials such as indium tin oxide, which have high light transmittance and good conductivity.

[0145] The passive display layer 33 is sandwiched between the second pixel electrode 344 and the second electrode 345 . One side of the passive display layer 33 contacts the second pixel electrode 344 , and the other side of the passive display layer 33 contacts the second electrode 345 .

[0146] It is understood that in this embodiment, the second driving circuit 34 is a bottom-gate structure. In some other embodiments, the first driving circuit 32 may be a top-gate structure, which is not limited in this application.

[0147] It should be understood that in the display panel 30 provided in the second embodiment of the present application, the first gate 321, the first active layer 322, and the first source-drain electrode 323 of the first driving circuit 32, and the second gate 341, the second active layer 342, and the second source-drain electrode 343 of the second driving circuit 34 are all arranged relative to each other along the second direction. That is, the first gate 321, the first active layer 322, and the first source-drain electrode 323 of the first driving circuit 32, and the second gate 341, the second active layer 342, and the second source-drain electrode 343 of the second driving circuit 34 are arranged in the same layer structure. As a result, the overall thickness of the display panel 30 can be reduced, which is conducive to the miniaturization and thinning of the display panel 30.

[0148] See also Figure 5 and Figure 6 , Figure 6 This is a manufacturing flow chart of a display panel provided in the second embodiment of the present application.

[0149] A manufacturing method provided in the second embodiment of the present application is used to manufacture the display panel 30 provided in the second embodiment of the present application. The manufacturing method includes:

[0150] S31: providing a first light-transmitting substrate 35;

[0151] S32: Disposing a first driving circuit 32, an active light-emitting layer 31, a second driving circuit 34, and a passive display layer 33 on the same side of a first light-transmitting substrate 35; the passive display layer 33 and the active light-emitting layer 31 are arranged opposite to each other and spaced apart along a first direction, and at least a portion of the first driving circuit 32 and at least a portion of the second driving circuit 34 are arranged side by side along a second direction; wherein the first direction is a stacking direction of the display panel 30, and the second direction is a direction perpendicular to the first direction;

[0152] S33 : providing a second light-transmitting substrate 36 , and sandwiching the first driving circuit 32 , the active light-emitting layer 31 , the second driving circuit 34 and the passive display layer 33 between the first light-transmitting substrate 35 and the second light-transmitting substrate 36 .

[0153] The first drive circuit 32, the active light-emitting layer 31, the second drive circuit 34, and the passive display layer 33 are sandwiched between a first light-transmitting substrate 35 and a second light-transmitting substrate 36. The active light-emitting layer 31 and the passive display layer 33 are arranged opposite each other and spaced apart along the stacking direction of the display panel 30. The first drive circuit 32 drives the active light-emitting layer 31 to emit light, while the second drive circuit 34 drives the passive display layer 33 to emit light. The display panel 30 can drive the active light-emitting layer 31 to emit light via the first drive circuit 32, causing one side of the display panel 30 to emit light. The display panel 30 can also drive the passive light-emitting layer 313 to emit light via the second drive circuit 34, causing the other side of the display panel 30 to emit light. This enables the display panel 30 to have dual-sided light-emitting capabilities. Furthermore, when the second drive circuit 34 drives the passive light-emitting layer 313 to emit light, the first drive circuit 32 can simultaneously drive the active light-emitting layer 31 to emit white light, thereby improving the brightness and contrast of the light emitted by the passive light-emitting layer 313 on the display panel 30.

[0154] It is understandable that the method for preparing the display panel 30 is not limited to the above steps, and the display panel 30 can also be prepared by other steps, and this application does not impose any limitation on this.

[0155] See also Figure 5 and Figures 7a to 7r , Figures 7a to 7r It is a cross-sectional schematic diagram of a manufacturing process of a display panel provided in the second embodiment of the present application.

[0156] Arranging the first driving circuit 32, the active light-emitting layer 31, the second driving circuit 34 and the passive display layer 33 on one side of the first light-transmitting substrate 35 includes the following steps:

[0157] A first light-transmitting substrate 35 is provided.

[0158] The first gate 321 and the second gate 341 are disposed on a side of the first light-transmitting substrate 35 facing the second light-transmitting substrate 36 , and are spaced apart from each other along the second direction.

[0159] An insulating layer 37 is disposed on a side of the first light-transmitting substrate 35 facing the first gate electrode 321 and the second gate electrode 341 . The insulating layer 37 is an integral structure and covers the first gate electrode 321 and the second gate electrode 341 .

[0160] A first active layer 322 and a second active layer 342 are arranged on the side of the insulating layer 37 facing away from the first light-transmitting substrate 35, and the first active layer 322 and the first gate 321 are arranged opposite to each other along a first direction, the second active layer 342 and the second gate 341 are arranged opposite to each other along the first direction, and the first active layer 322 and the second active layer 342 are arranged spaced apart along a second direction.

[0161] A first source-drain electrode 323 is disposed on a side of the first active layer 322 facing away from the first light-transmitting substrate 35 , and the first source-drain electrode 323 is disposed opposite to the first gate electrode 321 along a first direction.

[0162] The second source-drain 343 is disposed on the side of the second active layer 342 facing away from the first light-transmitting substrate 35 , and the second source-drain 343 and the second gate 341 are disposed opposite to each other along the first direction, and the first source-drain 323 and the second source-drain 343 are spaced apart along the second direction.

[0163] A first partial planarization layer 38 is disposed on the side of the first source-drain electrode 323 and the second source-drain electrode 343 facing away from the first light-transmitting substrate 35 , and the first partial planarization layer 38 covers the first source-drain electrode 323 and the second source-drain electrode 343 .

[0164] The first pixel electrode 324 is disposed on a side of the first partial planar layer 38 facing away from the first light-transmitting substrate 35 , and the first pixel electrode 324 penetrates the first partial planar layer 38 and contacts the first source and drain electrodes 323 .

[0165] On the side of the first pixel electrode 324 facing away from the first light-transmitting substrate 35 , the hole injection layer 311 , the hole transport layer 312 , the light-emitting layer 313 , the electron transport layer 314 and the electron injection layer 315 of the active light-emitting layer 31 are sequentially arranged, and the hole injection layer 311 is in contact with the first pixel electrode 324 .

[0166] A first electrode 325 is disposed on a side of the electron injection layer 315 of the active light emitting layer 31 facing away from the first light-transmitting substrate 35 , and the first electrode 325 is in contact with the electron injection layer 315 .

[0167] A second partial planar layer 38 is disposed on a side of the first electrode 325 facing away from the first light-transmitting substrate 35 , and the second partial planar layer 38 and the first partial planar layer 38 form an integral structure.

[0168] A second pixel electrode 344 is disposed on a side of the second planar layer 38 facing away from the first light-transmitting substrate 35 , and the second pixel electrode 344 penetrates the second planar layer 38 and contacts the second source and drain electrodes 343 .

[0169] A light-transmitting barrier 331 is disposed on a side of the second pixel electrode 344 facing away from the first light-transmitting substrate 35 .

[0170] A plurality of inner cavities 333 are disposed on a side of the light-transmitting barrier 331 facing away from the first light-transmitting substrate 35 , and an opening of each inner cavity 333 faces away from the first light-transmitting substrate 35 .

[0171] The electrophoretic particles 332 are filled into each inner cavity 333 , and each inner cavity 333 is provided with black negatively charged particles 334 and white positively charged particles 335 .

[0172] A second electrode 345 is disposed on a side of the light-transmitting barrier 331 facing away from the first light-transmitting substrate 35 , and the second electrode 345 blocks an opening of each inner cavity 333 .

[0173] Thus, a stacked structure of the first light-transmitting substrate 35 , the active light-emitting layer 31 , the first driving circuit 32 , the passive display layer 33 and the second driving circuit 34 is prepared.

[0174] After the first light-transmitting substrate 35 , the active light-emitting layer 31 , the first driving circuit 32 , the passive display layer 33 and the second driving circuit 34 form a stacked structure, a second light-transmitting substrate 36 is provided on the side of the second electrode 345 facing away from the first light-transmitting substrate 35 , thereby completing the preparation of the display panel 30 .

[0175] The above are some implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: Active light-emitting layer; a first driving circuit, the first driving circuit being used to drive the active light-emitting layer to display; a passive display layer, the passive display layer and the active light-emitting layer being arranged opposite to each other and spaced apart along a first direction, wherein the first direction is a stacking direction of the display panel; as well as A second driving circuit is used to drive the passive display layer to display.

2. The display panel according to claim 1, wherein When the second driving circuit drives the passive display layer to display a black screen on the side facing away from the active light-emitting layer, the first driving circuit drives the active light-emitting layer to display an image, and the display panel emits light from the side of the active light-emitting layer facing away from the passive display layer; When the second driving circuit drives the passive display layer to display images on the side facing away from the active light-emitting layer, the first driving circuit drives the active light-emitting layer to display white light, and the display panel emits light from the side of the passive display layer facing away from the active light-emitting layer.

3. The display panel according to claim 1, wherein The display panel further includes a light-transmitting base layer, the first driving circuit and the active light-emitting layer are arranged on one side of the light-transmitting base layer, and the second driving circuit and the passive display layer are arranged on the other side of the light-transmitting base layer.

4. The display panel according to claim 3, wherein: The display panel further includes a first light-transmitting substrate, wherein the first light-transmitting substrate and the light-transmitting base layer are spaced apart along the first direction; The first driving circuit includes a first gate, a first insulating layer, a first active layer, a first source and drain electrode, a first planar layer, a first pixel electrode and a first electrode; the first gate is arranged on a side of the first light-transmitting substrate facing the light-transmitting base layer; the first insulating layer is arranged on a side of the first light-transmitting substrate facing the light-transmitting base layer and covers the first gate; the first active layer is arranged on a side of the first insulating layer facing the light-transmitting base layer; the first source and drain electrode are arranged on a side of the first active layer facing the light-transmitting base layer; the first planar layer is arranged on a side of the first insulating layer facing the light-transmitting base layer and covers the first active layer and the first source and drain electrode; the first pixel electrode is arranged on a side of the first planar layer facing the light-transmitting base layer and contacts the first source and drain electrode; the active light-emitting layer is arranged on a side of the first pixel electrode facing the light-transmitting base layer; the first electrode is arranged on a side of the active light-emitting layer facing the light-transmitting base layer; The second driving circuit includes a second gate, a second insulating layer, a second active layer, a second source and drain, a second flat layer, a second pixel electrode and a second electrode; the second gate is arranged on the side of the light-transmitting base layer facing away from the first light-transmitting substrate; the second insulating layer is arranged on the side of the light-transmitting base layer facing away from the first light-transmitting substrate and covers the second gate; the second active layer is arranged on the side of the second insulating layer facing away from the light-transmitting base layer; the second source and drain are arranged on the side of the second active layer facing away from the light-transmitting base layer; the second flat layer is arranged on the side of the second insulating layer facing away from the light-transmitting base layer and covers the second active layer and the second source and drain; the second pixel electrode is arranged on the side of the second flat layer facing away from the light-transmitting base layer and contacts the second source and drain; the passive display layer is arranged on the side of the second pixel electrode facing away from the light-transmitting base layer; the second electrode is arranged on the side of the passive display layer facing away from the light-transmitting base layer.

5. The display panel according to claim 1, wherein The display panel further includes a first light-transmitting substrate, and the active light-emitting layer and the passive display layer are sequentially arranged on the same side of the first light-transmitting substrate along the first direction; A portion of the first driving circuit is disposed between the first light-transmitting substrate and the active light-emitting layer, and another portion of the first driving circuit is disposed on a side of the active light-emitting layer facing the passive display layer; A portion of the second driving circuit is arranged between the first light-transmitting substrate and the active light-emitting layer, another portion of the second driving circuit is arranged on the side of the passive display layer facing the active light-emitting layer, and another portion of the second driving circuit is arranged on the side of the passive display layer facing away from the active light-emitting layer.

6. The display panel according to claim 5, wherein: The display panel further includes an insulating layer and a planar layer stacked together, wherein the first light-transmitting substrate, the insulating layer, and the planar layer are stacked in sequence along the first direction; the planar layer has a receiving cavity extending along a second direction, and the second direction is perpendicular to the first direction; The first driving circuit includes a first gate, a first active layer, a first source and drain, a first pixel electrode and a first electrode; The first gate is located between the first light-transmitting substrate and the insulating layer; the first active layer is arranged on a side of the insulating layer facing away from the first light-transmitting substrate; the first source and drain electrodes are arranged on a side of the first active layer facing away from the first light-transmitting substrate; the first pixel electrode is arranged on an inner wall surface of the receiving cavity facing the first light-transmitting substrate and in contact with the first source and drain electrodes; the first electrode is arranged on an inner wall surface of the receiving cavity facing away from the first light-transmitting substrate and is spaced apart from the first pixel electrode along a first direction; the active light-emitting layer is arranged between the first pixel electrode and the first electrode; The second driving circuit includes a second gate, a second active layer, a second source and drain, a second pixel electrode and a second electrode; the second gate is located between the first light-transmitting substrate and the insulating layer, and the second gate and the first gate are opposite to each other and spaced apart along the second direction; the second active layer is arranged on the side of the insulating layer away from the first light-transmitting substrate; the second source and drain are arranged on the side of the second active layer away from the first light-transmitting substrate; the second pixel electrode is arranged on the side of the passive display layer facing the first light-transmitting substrate and in contact with the first source and drain; the second electrode is arranged on the side of the passive display layer away from the first light-transmitting substrate.

7. The display panel according to claim 1, wherein: The active light-emitting layer includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer; along the first direction, the hole injection layer, the hole transport layer, the light-emitting layer, the electron transport layer and the electron injection layer are stacked in sequence, and the first driving circuit is used to control the hole injection layer to form holes, and control the electron injection layer to form electrons.

8. The display panel according to claim 1, wherein: The passive display layer includes a light-transmitting baffle and electrophoretic particles; the light-transmitting baffle has multiple inner cavities, and the opening of each inner cavity faces away from the active light-emitting layer; the electrophoretic particles include multiple black negatively charged particles and multiple white positively charged particles, and each inner cavity is provided with the black negatively charged particles and the white positively charged particles; the second driving circuit is used to encapsulate the opening of each inner cavity and control the movement of the black negatively charged particles and the white positively charged particles in the inner cavity.

9. A display device, characterized in that: include: The display panel according to any one of claims 1 to 8.

10. A preparation method, characterized in that: For the display panel according to any one of claims 1 to 8, the preparation method comprises: providing a first light-transmitting substrate; A first driving circuit, an active light-emitting layer, a second driving circuit, and a passive display layer are arranged on the same side of the first light-transmitting substrate, and the passive display layer and the active light-emitting layer are arranged opposite to each other and spaced apart along a first direction; wherein the first direction is a stacking direction of the display panel; and A second light-transmitting substrate is provided, and the first driving circuit, the active light-emitting layer, the second driving circuit and the passive display layer are sandwiched between the first light-transmitting substrate and the second light-transmitting substrate.

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