Pixel structure, display panel and preparation method thereof

Abstract

The invention provides a pixel structure, a display panel and a preparation method thereof. The pixel structure comprises a plurality of sub-pixel units with different colors, the plurality of sub-pixel units are enclosed to form a ring, and a transparent display area is formed in the ring. Each sub-pixel unit comprises a main light-emitting sub-unit and a reflection sub-unit which are arranged in the annular circumferential direction. The main light-emitting subunit comprises a first reflection electrode, a light-emitting layer and a first transparent electrode which are sequentially arranged in a stacked mode in the direction towards the transparent display area and is used for emitting light towards the interior of the transparent display area. Each reflection subunit comprises a second transparent electrode, a light-emitting layer and a second reflection electrode which are sequentially arranged in a stacked mode in the direction facing the transparent display area, and the second reflection electrode is used for reflecting light back into the transparent display area. The pixel structure can improve display transparency and display brightness.

Description

Technical Field

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

[0002] With the development of transparent display technology, transparent display devices are gradually appearing in people's lives. For example, in some areas, transparent window screens have been applied to trains to display real-time daily information, such as weather forecasts, news, train operation status, train location and other traffic information. Not only in transportation, transparent organic light emitting diode (OLED) displays can also be used in a variety of scenarios such as architecture, commercial display, and office.

[0003] At present, transparent display of OLED panels is mainly achieved through transparent electrodes, the self-luminous characteristics of OLED, and the design of adding transparent sub-pixels, which are regularly distributed in the entire display area. However, the transmittance of transparent sub-pixels is limited, which affects the improvement of transparency. Summary of the invention

[0004] The present application provides a pixel structure, a display panel and a method for manufacturing the same, aiming to solve the problem in the prior art that the light transmittance of transparent sub-pixels is limited, which affects the improvement of transparency.

[0005] In order to solve the above technical problems, the first technical solution provided by the present application is to provide a pixel structure. The pixel structure includes a plurality of sub-pixel units of different colors, the plurality of sub-pixel units are arranged to form a ring, and a transparent display area is formed inside the ring.

[0006] Among them, the sub-pixel unit includes a main light-emitting sub-unit and a reflective sub-unit arranged along a ring-shaped circumference; wherein the main light-emitting sub-unit includes a first reflective electrode, a light-emitting layer and a first transparent electrode stacked in sequence along a direction toward a transparent display area, so as to emit light toward the transparent display area; the reflective sub-unit includes a second transparent electrode, a light-emitting layer and a second reflective electrode stacked in sequence along a direction toward the transparent display area, and the second reflective electrode is used to reflect light back into the transparent display area.

[0007] In some embodiments, in each sub-pixel unit, the main light-emitting sub-unit and the reflective sub-unit are arranged adjacent to each other; the main light-emitting sub-unit of each sub-pixel unit is arranged adjacent to the reflective sub-unit of an adjacent sub-pixel unit.

[0008] In some embodiments, the pixel structure includes three sub-pixel units of different colors, and the three sub-pixel units are arranged to form a hexagonal ring.

[0009] In some embodiments, along the circumference of the transparent display area, an extension length of the main light emitting subunit is greater than an extension length of the reflective subunit.

[0010] In some embodiments, the main light emitting sub-unit of each sub-pixel unit and the reflective sub-unit of an adjacent sub-pixel unit are arranged parallel to each other.

[0011] In some embodiments, along a direction perpendicular to the pixel structure, the light emitting layer includes a first surface and a second surface opposite to each other;

[0012] In the main light-emitting subunit, the first reflective electrode extends from the side of the light-emitting layer to the first surface, and the first reflective electrode covers the side of the light-emitting layer away from the transparent display area and the first surface; the main light-emitting subunit also includes a first reflective sub-electrode arranged on the second surface, the first reflective sub-electrode is in contact with and electrically connected to the first transparent electrode to form a first anode electrode, the first anode electrode covers the side of the light-emitting layer close to the transparent display area and the second surface; the first reflective electrode is insulated from the first anode electrode;

[0013] In the reflective subunit, the second reflective electrode extends from the side of the light-emitting layer to the first surface, and the second reflective electrode covers the side of the light-emitting layer close to the transparent display area and the first surface; the reflective subunit also includes a second reflective sub-electrode arranged on the second surface, the second reflective sub-electrode is in contact and electrically connected with the second transparent electrode to form a second anode electrode, and the second anode electrode covers the side of the light-emitting layer close to the transparent display area and the second surface; the second reflective electrode is insulated from the second anode electrode.

[0014] In order to solve the above technical problem, the second technical solution provided by the present application is: to provide a display panel. The display panel includes:

[0015] Driver substrate;

[0016] A plurality of pixel structures provided by the above technical solution are arranged on a driving substrate and electrically connected to the driving substrate.

[0017] In some embodiments, the pixel structure includes three sub-pixel units of different colors, and the three sub-pixel units are arranged to form a hexagonal ring; multiple pixel structures are spliced ​​together to form a honeycomb structure.

[0018] In some embodiments, two adjacent pixel structures share a same pixel subunit on their adjacent sides; the shared pixel subunit serves as a main light-emitting subunit of one pixel structure and as a reflective subunit of another pixel structure; or

[0019] The main light-emitting subunit of the pixel structure is arranged adjacent to the main light-emitting subunit of the adjacent pixel structure, and the reflective subunits of each adjacent six pixel structures are arranged to form a hexagon, a transparent sub-display area is formed inside the hexagon, and the reflective subunit emits light toward the transparent sub-display area.

[0020] In order to solve the above technical problems, the third technical solution provided by the present application is to provide a method for preparing a display panel. The preparation method comprises:

[0021] Make a drive substrate;

[0022] Making light-emitting layers of various colors on the driving substrate;

[0023] A reflective electrode and a transparent electrode are respectively formed on two opposite sides of each light-emitting layer to form a main light-emitting subunit or a reflective subunit;

[0024] Among them, each main light-emitting unit and the corresponding reflective sub-unit constitute a sub-pixel unit, and multiple sub-pixel units of different colors are arranged to form a ring, and a transparent display area is formed inside the ring. The transparent display area and the surrounding multiple sub-pixel units constitute a pixel structure; in each pixel structure, the transparent electrode of the main light-emitting unit is located on the side close to the transparent display area, so that the main light-emitting unit emits light toward the transparent display area; the reflective electrode of the reflective sub-unit is located on the side close to the transparent display area, so as to reflect light back into the transparent display area.

[0025] Beneficial effects of the present application: Different from the prior art, the present application provides a pixel structure, a display panel and a method for manufacturing the same. The pixel structure is applied to a display panel, comprising a plurality of sub-pixel units of different colors, the plurality of sub-pixel units are arranged to form a ring, and a transparent display area is formed inside the ring. The sub-pixel unit includes a main light-emitting sub-unit and a reflective sub-unit arranged along the circumferential direction of the ring. The main light-emitting sub-unit includes a first reflective electrode, a light-emitting layer and a first transparent electrode arranged in sequence in the direction toward the transparent display area, so that the light of the light-emitting layer is emitted into the transparent display area through the first transparent electrode, and the light of the light-emitting layer can also be reflected into the transparent display area through the first reflective electrode, thereby reducing light loss and improving display brightness; at the same time, by making the reflective sub-unit include a second transparent electrode, a light-emitting layer and a second reflective electrode arranged in sequence in the direction toward the transparent display area, the light of other main light-emitting sub-units can be reflected back to the transparent display area by the second reflective electrode, so that more light enters the transparent display area, and by setting sub-pixel units of different colors, the reflection principle is used to make the emitted light of sub-pixel units of different colors mixed in the transparent display area, and after mixing, it is emitted from both sides of the transparent display area, thereby realizing transparent display in the transparent display area. That is, by making the light of sub-pixel units of different colors displayed in the transparent display area, the display area of ​​the pixel structure is in the inner transparent area of ​​the ring, and the area of ​​the transparent display area can be increased while ensuring the display brightness, thereby improving the transparency of the display. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 is a schematic diagram of a planar structure of a pixel structure provided in the first embodiment of the present application;

[0028] Figure 2 yes Figure 1 A schematic cross-sectional structure diagram of an embodiment of a pixel structure in the AA direction;

[0029] Figure 3 yes Figure 1 A schematic cross-sectional structure diagram of another embodiment of the pixel structure in the AA direction;

[0030] Figure 4 is a schematic diagram of a planar structure of a pixel structure provided in the second embodiment of the present application;

[0031] Figure 5is a schematic diagram of the planar structure of a display panel provided in the first embodiment of the present application;

[0032] Figure 6 is a schematic diagram of the planar structure of a display panel provided in the second embodiment of the present application;

[0033] Figure 7 is a schematic flow chart of a method for preparing a display panel provided in one embodiment of the present application;

[0034] Figure 8 It is a schematic flow chart of a method for preparing a display panel provided in another embodiment of the present application.

[0035] Reference numerals:

[0036] 100-display panel; 10-driving substrate; 20-pixel structure; 21-sub-pixel unit; 211-main light-emitting sub-unit; 212-reflection sub-unit; 221-first reflection electrode; 222-second reflection electrode; 223-first transparent electrode; 224-second transparent electrode; 225-first reflection sub-electrode; 226-second reflection sub-electrode; 23-light-emitting layer; 231-red light-emitting layer; 232-green light-emitting layer; 233-blue light-emitting layer; 24-transparent display area; 251-first anode electrode; 252-first cathode electrode; 253-second anode electrode; 254-second cathode electrode; 30-encapsulation layer;

[0037] R-red sub-pixel; R1-red main light-emitting sub-unit; R2-red reflective sub-unit; G-green sub-pixel; G1-green main light-emitting sub-unit; G2-green reflective sub-unit; B-blue sub-pixel; B1-blue main light-emitting sub-unit; B2-blue reflective sub-unit; BM-black matrix. DETAILED DESCRIPTION

[0038] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0039] In the following description, for the purpose of explanation rather than limitation, specific details such as specific system structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] The terms "first", "second", "third" in this application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of this application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0042] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] The present application is described in detail below with reference to the accompanying drawings and embodiments.

[0044] See also Figure 1 and Figure 2 , Figure 1 is a schematic diagram of a planar structure of a pixel structure provided in the first embodiment of the present application, Figure 2 yes Figure 1Schematic diagram of the cross-sectional structure of an embodiment of the pixel structure in the AA direction. In this embodiment, a pixel structure 20 is provided, and the pixel structure 20 is applied to the display panel 100. The pixel structure 20 includes a plurality of sub-pixel units 21 of different colors, and the plurality of sub-pixel units 21 of different colors are arranged to form a ring, and a transparent display area 24 is formed inside the ring. That is, the pixel structure 20 includes a transparent display area 24 and a plurality of sub-pixel units 21 arranged around the transparent display area 24, and the plurality of sub-pixel units 21 are arranged to form a ring, and the plurality of sub-pixel units 21 include sub-pixels of different colors, and may specifically include red sub-pixels R, green sub-pixels G and blue sub-pixels B, and the number of sub-pixels of each color is at least one, so as to realize color display; in the following embodiments of the present application, the red sub-pixel R, the green sub-pixel G and the blue sub-pixel B are specifically used as examples for explanation. Of course, in other embodiments, the plurality of sub-pixel units 21 may also include sub-pixels of other colors, which may be specifically set according to actual needs.

[0045] The sub-pixel unit 21 includes a main light-emitting sub-unit 211 and a reflective sub-unit 212 arranged along the circumferential direction of the ring. The main light-emitting sub-unit 211 includes a first reflective electrode 221, a light-emitting layer 23 and a first transparent electrode 223 stacked in sequence in a direction toward the transparent display area 24, so as to emit light toward the transparent display area 24.

[0046] That is, along the radial direction of the transparent display area 24, the main light-emitting subunit 211 includes a light-emitting layer 23 and a first reflective electrode 221 and a first transparent electrode 223 arranged on opposite sides of the light-emitting layer 23, the first reflective electrode 221 is arranged on the side of the light-emitting layer 23 away from the transparent display area 24, and the first transparent electrode 223 is arranged on the side of the light-emitting layer 23 close to the transparent display area 24, so that the light-emitting surface of the main light-emitting subunit 211 faces the transparent display area 24, and the light of its light-emitting layer 23 can be emitted to the transparent display area 24. The first reflective electrode 221 can be used to reflect the light of the light-emitting layer 23 to the transparent display area 24, so as to prevent the light of the main light-emitting subunit 211 from leaking to the adjacent pixel structure 20 to cause the problem of cross-color, and can also improve the display brightness of the transparent display area 24. Specifically, the red light of the red main light-emitting subunit R1, the green light of the green main light-emitting subunit G1, and the blue light of the blue main light-emitting subunit B1 are all emitted to the transparent display area 24 and mixed, and then emitted from the upper and lower sides of the transparent display area 24, thereby realizing the function of transparent display in the transparent display area 24.

[0047] The reflective subunit 212 includes a second transparent electrode 224 , a light emitting layer 23 , and a second reflective electrode 222 which are sequentially stacked in a direction toward the transparent display area 24 . The second electrode can be used to reflect light back into the transparent display area 24 .

[0048] That is, along the radial direction of the transparent display area 24, the reflective subunit 212 includes a light-emitting layer 23 and a second transparent electrode 224 and a second reflective electrode 222 arranged on opposite sides of the light-emitting layer 23, the second transparent electrode 224 is arranged on the side of the light-emitting layer 23 away from the transparent display area 24, and the second reflective electrode 222 is arranged on the side of the light-emitting layer 23 close to the transparent display area 24, so that the reflective electrode layer of the reflective subunit 212 is arranged close to the transparent display area 24, and the light-emitting surface of the reflective subunit 212 is arranged in a direction away from the transparent display area 24, so that the second reflective electrode 222 can reflect light back to the transparent display area 24, further mix the light and display it, thereby improving the display brightness.

[0049] Specifically, the first reflective electrodes 221 of the plurality of main light-emitting subunits 211 and the second reflective electrodes 222 of the plurality of reflective subunits 212 surround the transparent display area 24 to form a light reflective cavity, so that the light emitted by the main light-emitting subunits 211 is evenly mixed in the transparent display area 24 and emitted from both sides of the transparent display area 24, thereby realizing the transparent display function, and also avoiding light leakage and cross-color, thereby improving the display brightness. It should be noted that the two sides of the transparent display area 24 mentioned here refer to the opposite sides in the direction perpendicular to the transparent display. Through the arrangement of the above-mentioned pixel structure 20, the pixel structure 20 performs transparent display of the image in the transparent display area 24, which can effectively improve the transparency of the transparent display of the pixel structure 20, and can also increase the area of ​​the transparent display area 24, thereby further improving the transparency of the transparent display.

[0050] Moreover, by arranging the second transparent electrode 224 of the reflective subunit 212 on the side of the light-emitting layer 23 away from the transparent display area 24, the light of the reflective subunit 212 can be emitted toward the outside of the transparent display area 24, so that when the pixel structure 20 is applied to the display panel 100, the light of the reflective subunit 212 can be emitted to the transparent display area 24 of the adjacent sub-pixel structure 20, that is, the reflective subunit 212 can serve as the light-emitting subunit of the adjacent pixel structure 20, which is beneficial to the close arrangement of the pixel structures 20, reduces the gap between adjacent pixel structures 20, and is beneficial to the improvement of pixel resolution.

[0051] Specifically, in the main light-emitting subunit 211, the first reflective electrode 221 and the first transparent electrode 223 can be used as a cathode electrode and an anode electrode, or as an anode electrode and a cathode electrode, respectively. In the reflective subunit 212, the second reflective electrode 222 and the second transparent electrode 224 can be used as a cathode electrode and an anode electrode, or as an anode electrode and a cathode electrode, respectively. Among them, the materials of the first reflective electrode 221 and the second reflective electrode 222 include metal materials with high reflectivity, such as silver (Ag), aluminum (Al), zinc (Zn), copper (Cu), gold (Au) and other metal materials, and silver can be used in this embodiment. Specifically, the first reflective electrode 221 and the second reflective electrode 222 can be a single-layer high-reflective metal electrode, or can also include a stacked transparent conductive layer-metal layer-transparent conductive layer, the material of the metal layer can include the above-mentioned high-reflective metal, such as Ag, and the material of the transparent conductive layer can include transparent conductive materials such as indium tin oxide (ITO), indium zinc oxide (IZO), and indium gallium zinc oxide (IGZO). The first transparent electrode 223 and the second transparent electrode 224 may be transparent conductive layers, and the material of the transparent conductive layers may include the above-mentioned transparent conductive materials.

[0052] In the present embodiment, the pixel structure 20 includes three sub-pixel units 21 of different colors, specifically including a red sub-pixel R, a green sub-pixel G and a blue sub-pixel B, and each sub-pixel unit 21 includes the above-mentioned main light-emitting sub-unit 211 and a reflective sub-unit 212. That is, the pixel structure 20 includes three main light-emitting sub-units 211 of different colors and corresponding three reflective sub-units 212 of different colors. The three main light-emitting sub-units 211 of different colors and the corresponding three reflective sub-units 212 of different colors are arranged to form a hexagonal ring. The hexagonal design is conducive to the arrangement design of the pixel structure 20 on the display panel 100. At the same time, the hexagonal design is also conducive to the symmetrical arrangement of the sub-pixel units 21 to improve the uniformity of light mixing in the transparent display area 24.

[0053] Among them, in each sub-pixel unit 21, the main light-emitting sub-unit 211 and the reflective sub-unit 212 are arranged adjacent to each other; the main light-emitting sub-unit 211 of each sub-pixel unit 21 is arranged adjacent to the reflective sub-unit 212 of the adjacent sub-pixel unit 21. It can be understood that along the circumference of the transparent display area 24 (clockwise or counterclockwise), the main light-emitting sub-units 211 and the reflective sub-units 212 are arranged alternately in sequence. For example, along the counterclockwise direction, the arrangement of each sub-pixel unit 21 is: red reflective sub-unit R2-red main light-emitting sub-unit R1-blue reflective sub-unit B2-blue main light-emitting sub-unit B1-green reflective sub-unit G2-green main light-emitting sub-unit G1. Such arrangement enables each main light-emitting subunit 211 to have a reflective subunit 212 on the opposite side along the light-emitting direction, which is beneficial to the reflection of light; moreover, the main light-emitting units and the reflective subunits 212 can be arranged alternately and evenly spaced along the circumference of the transparent display area 24, which is beneficial to improving the uniformity of light mixing in the transparent display area 24, as well as the uniformity of light distribution in the transparent display area 24, thereby improving the display effect.

[0054] In this embodiment, the main light-emitting subunit 211 of each sub-pixel unit 21 is arranged parallel to the reflective subunit 212 of the adjacent sub-pixel unit 21. That is, each main light-emitting subunit 211 is arranged opposite and parallel to the reflective subunit 212 on the opposite side, so that when the reflective subunit 212 reflects light, the light reflection angles in all directions are relatively balanced, thereby improving the uniformity of light mixing and light distribution, and also making the shape of the pixel structure 20 more regular. For example, in this embodiment, the pixel structure 20 is a regular hexagon, which is beneficial to the arrangement design of the pixel structure 20 on the actual panel, thereby facilitating the improvement of pixel density.

[0055] Of course, in other embodiments, the pixel structure 20 may also be in other shapes, such as triangle, quadrilateral, hexagon, other polygons or circles, ellipses, etc., which may be specifically arranged according to the number of sub-pixel units 21 and the pixel arrangement design scheme. Among them, in each sub-pixel unit 21, the main light-emitting sub-unit 211 and the reflective sub-unit 212 may be arranged in a colinear manner or at a certain angle, or the main light-emitting sub-unit 211 may also be arc-shaped, which may be specifically arranged according to actual needs.

[0056] See also Figure 3 , Figure 3 yes Figure 1 FIG. 2 is a schematic cross-sectional view of another embodiment of the pixel structure 20 in the AA direction. In this embodiment, along a direction perpendicular to the pixel structure 20, the light emitting layer 23 includes a first surface and a second surface opposite to each other.

[0057] In the main light-emitting subunit 211, the first reflective electrode 221 extends from the side of the light-emitting layer 23 to the first surface, and the first reflective electrode 221 covers the side and first surface of the light-emitting layer 23 away from the transparent display area 24; the main light-emitting subunit 211 also includes a first reflective sub-electrode 225 arranged on the second surface, the first reflective sub-electrode 225 is in contact with and electrically connected to the first transparent electrode 223 to form a first anode electrode 251, and the first anode electrode 251 covers the side and second surface of the light-emitting layer 23 close to the transparent display area 24; the first reflective electrode 221 is insulated from the first anode electrode 251.

[0058] The side wall surface of the light-emitting layer 23 away from the transparent display area 24 is defined as the outer wall surface, the side wall surface of the light-emitting layer 23 close to the transparent display area 24 is defined as the inner wall surface, the first surface of the light-emitting layer 23 is the top surface, and the second surface of the light-emitting layer 23 is the bottom surface. It can be understood that, in the main light-emitting sub-unit 211, the first reflective electrode 221 is in an "L" shape, covering the outer wall and top surface of the light-emitting layer 23, the first anode electrode 251 includes a first transparent electrode 223 and a first reflective sub-electrode 225 which are in contact and electrically connected with each other, and are combined to form an "L"-shaped electrode, the first transparent electrode 223 is arranged on the inner wall surface of the light-emitting layer 23, and the first reflective sub-electrode 225 is arranged on the bottom surface of the light-emitting layer 23, so that in the main light-emitting sub-unit 211, the top surface, bottom surface and outer wall surface of the light-emitting layer 23 are all covered by electrodes with reflective properties, so that the light of the light-emitting layer 23 can only be emitted to the transparent display area 24 through the first transparent electrode 223 arranged on the inner wall surface, so that the light loss of the light-emitting layer 23 is reduced, the display brightness of the transparent display area 24 is improved, and the driving voltage of the sub-pixel unit 21 can be reduced, thereby improving the product life. Moreover, by making the first reflective electrode 221 cover the outer wall and top surface of the light-emitting layer 23, the contact area between the light-emitting layer 23 and the first reflective electrode 221 is increased, and by making the first anode electrode 251 cover the inner wall and bottom surface of the light-emitting layer 23, the contact area between the light-emitting layer 23 and the first anode electrode 251 is increased, thereby increasing the area of ​​the light-emitting material contacting the driving voltage, improving the light extraction efficiency, and further improving the luminous brightness of the main light-emitting sub-unit 211, thereby further improving its display brightness in the transparent display area 24. It should be noted that the first reflective electrode 221 and the first anode electrode 251 need to be insulated from each other to avoid the problem of short-circuiting electrode signals. Specifically, the first reflective electrode 221 serves as the first cathode electrode 252 of the light-emitting layer 23, and the first transparent electrode 223 and the first reflective sub-electrode 225 serve as the first anode electrode 251 of the light-emitting layer 23. The material of the light-emitting layer 23 is an organic light-emitting material, which can be made by a process such as evaporation.

[0059] In the reflective subunit 212, the second reflective electrode 222 extends from the side of the light-emitting layer 23 to the first surface, and the second reflective electrode 222 covers the side and first surface of the light-emitting layer 23 close to the transparent display area 24; the reflective subunit 212 also includes a second reflective sub-electrode 226 arranged on the second surface, the second reflective sub-electrode 226 is in contact with and electrically connected to the second transparent electrode 224 to form a second anode electrode 253, and the second anode electrode 253 covers the side and second surface of the light-emitting layer 23 close to the transparent display area 24; the second reflective electrode 222 is insulated from the second anode electrode 253.

[0060] It can be understood that, in the reflective subunit 212, the second reflective electrode 222 is in an "L" shape, covering the inner wall and top surface of the light-emitting layer 23, and the second anode electrode 253 includes a second transparent electrode 224 and a second reflective sub-electrode 226 that are in contact and electrically connected with each other, and are combined to form an "L"-shaped electrode, the second transparent electrode 224 is arranged on the outer wall of the light-emitting layer 23, and the second reflective sub-electrode 226 is arranged on the bottom surface of the light-emitting layer 23, so that in the reflective subunit 212, the top surface, the bottom surface and the inner wall surface of the light-emitting layer 23 are all covered by electrodes with reflective properties, so that the light of the light-emitting layer 23 can only be emitted to the outside of the transparent display area 24 through the first transparent electrode 223 arranged on the outer wall. For example, on the display panel 100, the light of the light-emitting layer 23 can be emitted to the transparent display area 24 of the adjacent pixel structure 20, which can prevent the reflective subunit 212 from leaking light and affecting the display of the transparent display area 24. Moreover, by making the second reflective electrode 222 cover the inner wall and top surface of the light-emitting layer 23, the contact area between the light-emitting layer 23 and the second reflective electrode 222 is increased, and by making the second anode electrode 253 cover the outer wall and bottom surface of the light-emitting layer 23, the contact area between the light-emitting layer 23 and the second anode electrode 253 is increased, so that the area of ​​the light-emitting material contacting the driving voltage is increased, the light extraction efficiency is improved, and the luminous brightness of the reflective subunit 212 can be further improved, so that when the reflective electrode is used as a light-emitting unit of the adjacent pixel structure 20, its display brightness in the adjacent transparent display area 24 can be further improved, so that the driving voltage of the product can be further reduced and the product life can be improved. It should be noted that the second reflective electrode 222 and the second anode electrode 253 need to be insulated from each other to avoid the problem of short-circuiting electrode signals. Specifically, the second reflective electrode 222 serves as the second cathode electrode 254 of the light-emitting layer 23, and the second anode electrode 253 serves as the anode electrode of the light-emitting layer 23. The material of the light-emitting layer 23 is an organic light-emitting material, which can be made by a process such as evaporation.

[0061] See also Figure 4 , Figure 42 is a schematic diagram of the planar structure of the pixel structure 20 provided in the second embodiment of the present application. In this embodiment, the specific structure of the pixel structure 20 is the same as that in the above embodiment, and the details can be referred to in detail above. The difference is that in the pixel structure 20 provided in this embodiment, along the circumference of the transparent display area 24, the extension length of the main light-emitting subunit 211 is greater than the extension length of the reflective subunit 212.

[0062] Specifically, in each sub-pixel unit 21, the length of the main light-emitting sub-unit 211 is greater than the extended length of the reflective sub-unit 212, so that the light-emitting area of ​​the main light-emitting sub-unit 211 is larger, the light-emitting brightness of the main light-emitting sub-unit 211 is improved, and the display brightness of the pixel structure 20 in the transparent display area 24 is improved.

[0063] In this embodiment, the main light-emitting subunit 211 and the reflective subunit 212 of each sub-pixel unit 21 are not collinear, and the pixel structure 20 is a hexagonal structure, that is, the red sub-pixel R unit 21, the green sub-pixel G unit 21 and the blue sub-pixel B unit 21 are arranged to form a hexagon, and the transparent display area 24 is a hexagon. Among them, the lengths of the red main light-emitting subunit R1, the green main light-emitting subunit G1 and the blue main light-emitting subunit B1 are the same, and the lengths of the red reflective subunit, the green reflective subunit G2 and the blue reflective subunit B2 are the same, so as to form a regular hexagon.

[0064] In other embodiments, the lengths of the red main light-emitting subunit R1, the green main light-emitting subunit G1, and the blue main light-emitting subunit B1 may be increased in sequence to keep the service life of the three the same, so as to avoid the different service life and aging degree of the main light-emitting subunits 211 of different colors due to the different attenuation speeds of the light-emitting materials of different colors, thereby affecting the display effect. In other embodiments, the main light-emitting subunits 211 and the reflective subunits 212 of the same color may not be arranged adjacent to each other. For example, the main light-emitting subunits 211 and the reflective subunits 212 of the same color may be arranged relative to each other to increase the design flexibility of the pixel structure 20, which is beneficial to the shape design and arrangement design of the pixel structure 20, thereby improving the pixel density and display effect.

[0065] In the embodiment of the present application, the pixel structure 20 is disposed on one side of the driving substrate 10, and the pixel structure 20 further includes an encapsulation layer 30, which covers each sub-pixel unit 21, fills the transparent display area 24, and is flattened on the side of the sub-pixel unit 21 away from the driving substrate 10. The encapsulation layer 30 is specifically a transparent material, including a first inorganic encapsulation layer 30, an organic encapsulation layer 30, and a second inorganic encapsulation layer 30 that are stacked to seal the sub-pixel unit 21, to prevent external water and oxygen from invading the organic light-emitting layer 23, and causing the sub-pixel unit 21 to fail.

[0066] Furthermore, in the pixel structure 20 provided in the embodiment of the present application, a black matrix BM is provided between adjacent sub-pixel units 21, and between adjacent main light-emitting sub-units 211 and reflective sub-units 212, so as to isolate adjacent pixel sub-units and avoid cross-color problems between adjacent sub-units that affect the display.

[0067] See also Figure 5 , Figure 5 1 is a schematic diagram of a planar structure of a display panel provided in the first embodiment of the present application. In this embodiment, a display panel 100 is provided, and the display panel 100 includes a driving substrate 10 and a plurality of pixel structures 20 provided in the above embodiments. The plurality of pixel structures 20 are arranged on the driving substrate 10 in a preset arrangement and are electrically connected to the driving substrate 10, so as to drive the pixel units through the driving substrate 10 to display corresponding images.

[0068] The pixel structure 20 includes three sub-pixel units 21 of different colors, and the three sub-pixel units 21 are arranged to form a hexagonal ring; multiple pixel structures 20 are spliced ​​together to form a honeycomb structure. The specific structure and function of the pixel structure 20 are the same or similar to those of the above embodiment, and can achieve the same technical effect. Please refer to the above introduction for details, and no further description will be given here.

[0069] In this embodiment, the shape of the pixel structure 20 is a hexagon, and the sides of two adjacent pixel structures 20 that are close to each other share the same pixel sub-unit; the shared pixel sub-unit serves as the main light-emitting sub-unit 211 of one of the pixel structures 20, and serves as the reflection sub-unit 212 of the other pixel structure 20. By making the two adjacent pixel structures 20 share the same pixel sub-unit, the pixel sub-unit located on each side of the hexagon can serve as the main light-emitting sub-unit 211 of one of the pixel structures 20 for emitting light, and can also serve as the reflection sub-unit 212 of the adjacent pixel structure 20 for reflecting light, thereby improving the utilization rate of the pixel sub-unit, and can also further increase the opening area of ​​the transparent display area 24, further improving the pixel density and display transparency.

[0070] See also Figure 6 , Figure 6 2 is a schematic diagram of the planar structure of the display panel provided in the second embodiment of the present application. In this embodiment, the main light-emitting subunit 211 of the pixel structure 20 is arranged adjacent to the main light-emitting subunit 211 of the adjacent pixel structure 20, and the reflective subunits 212 of each six adjacent pixel structures 20 are arranged to form a hexagon, and a transparent sub-display area 241 is formed inside the hexagon, and the reflective subunit 212 emits light toward the transparent sub-display area 241.

[0071] In this embodiment, the two main light-emitting subunits 211 on the side where each two adjacent pixel structures 20 are close to each other have the same color, which is beneficial to the production of the light-emitting layer 23. At the same time, by making the emission subunits on the side where each six adjacent pixel structures 20 are close to each other form a hexagon, a transparent sub-display area 241 is formed inside the hexagon, so that the reflective subunit 212 can emit light toward the transparent sub-display area 241. It can be understood that every six adjacent pixel structures 20 are surrounded, and the side close to each other is surrounded to form a hexagonal transparent area, that is, the transparent sub-display area 241, and six reflective subunits 212 are surrounded around the transparent sub-display area 241. These six reflective subunits 212 are used to emit light to the transparent sub-display area 241 and mix light, thereby performing transparent display. The transparent sub-display area 241 and the surrounding reflective sub-units 212 form a new pixel unit, which not only makes the arrangement of the pixel structure 20 more compact, but also the reflective sub-unit 212 in each pixel structure 20 can be used as a sub-light-emitting unit of the new pixel unit, thereby improving the utilization rate of the reflective sub-unit 212 and avoiding the waste of light-emitting elements caused by using it only as a reflective unit.

[0072] In other embodiments, the arrangement structure of the multiple pixel structures 20 can also be in other forms, not limited to the above two embodiments, and can be specifically set according to actual design needs and display requirements. The embodiments of the present application only take the above two embodiments as examples for illustration, which does not mean that the arrangement structure of the pixel structure 20 only includes the arrangement structure in the above embodiments.

[0073] See also Figure 7 , Figure 7 1 is a schematic flow chart of a method for preparing a display panel provided in an embodiment of the present application. This embodiment provides a method for preparing a display panel 100, which is used to prepare the display panel 100 involved in the above embodiment. The preparation method includes:

[0074] S10: manufacturing a driving substrate 10;

[0075] S20: manufacturing a plurality of light-emitting layers 23 of different colors on the driving substrate 10;

[0076] S30 : Reflective electrodes and transparent electrodes are respectively made on two opposite sides of each light-emitting layer 23 to form a main light-emitting subunit 211 or a reflective subunit 212 .

[0077] Among them, each main light-emitting unit and the corresponding reflective sub-unit 212 constitute a sub-pixel unit 21, and multiple sub-pixel units 21 of different colors are arranged to form a ring, and a transparent display area 24 is formed inside the ring. The transparent display area 24 and the surrounding multiple sub-pixel units 21 constitute a pixel structure 20; in each pixel structure 20, the transparent electrode of the main light-emitting unit is located on the side close to the transparent display area 24, so that the main light-emitting unit emits light toward the transparent display area 24; the reflective electrode of the reflective sub-unit 212 is located on the side close to the transparent display area 24, so as to reflect light back into the transparent display area 24.

[0078] It should be noted that the order of manufacturing the light emitting layer 23 and the electrode in the above steps S20 and S30 can be adjusted according to the shapes of the reflective electrode and the transparent electrode.

[0079] In this embodiment, the specific structures of the main light-emitting subunit 211 and the reflective subunit 212 are similar to those of Figure 2 In the same way as in the embodiment, the light emitting layer 23 may be manufactured in step S20 first, and then the first reflective electrode 221 , the second reflective electrode 222 , the first transparent electrode 223 and the second transparent electrode 224 may be manufactured in step S30 .

[0080] The display panel 100 prepared by this embodiment can effectively improve the display brightness and display transparency. The specific structure and function of the display panel 100 are the same as the structure and function of the display panel 100 in the above embodiment, and can achieve the same technical effects. The specific structure and technical effects can be referred to the above introduction.

[0081] See also Figure 8 , Figure 8 is a schematic flow chart of a method for preparing a display panel provided in another embodiment of the present application. The preparation method provided in this embodiment can be used to prepare a display panel including: Figure 3 The display panel 100 of the pixel structure 20 is prepared by a method comprising:

[0082] S10: manufacturing a driving substrate 10;

[0083] S31: manufacturing a first reflective sub-electrode 225 and a second reflective sub-electrode 226 on the driving substrate 10;

[0084] S21: forming light-emitting layers 23 of different colors on the first reflective sub-electrode 225 and the second reflective sub-electrode 226 respectively;

[0085] S32: manufacturing a first reflective electrode 221 or a second reflective electrode 222 on the side wall surface and the top surface of the light-emitting layer 23 to serve as a cathode electrode of the light-emitting layer 23;

[0086] S33: manufacturing a first transparent electrode 223 or a second transparent electrode 224 on the side wall surface of the light emitting layer 23, and connecting the first transparent electrode 223 to the first reflective sub-electrode 225, and connecting the second transparent electrode 224 to the second reflective sub-electrode 226;

[0087] S40 : manufacturing an encapsulation layer 30 on a side of the main light-emitting subunit 211 and the reflective subunit 212 away from the driving substrate 10 , and filling the transparent display area 24 with the encapsulation layer 30 .

[0088] In this embodiment, the light-emitting layer 23 can be made by an evaporation process in step S21. In steps S31, S32 and S33, electrodes of corresponding shapes can be formed by deposition, exposure, development and etching. In the display panel 100 prepared in this embodiment, in the pixel structure 20 on the display panel 100, the anode electrode and the cathode electrode form an "L"-shaped electrode, which covers the light-emitting layer 23, increases the contact area between the light-emitting layer 23 and the electrode, improves the light extraction efficiency, and can effectively improve the light brightness. At the same time, each light-emitting layer 23 has only one side as a transparent electrode, and the other three sides are reflective electrodes, so that the light of the light-emitting layer 23 can only be emitted through the side where the transparent electrode is located, reducing light loss, further improving the display brightness, and can effectively reduce the driving voltage of the sub-pixel unit 21, thereby improving the brightness of the display panel 100.

[0089] In an embodiment of the present application, a display device is further provided, which includes a main board and a display panel 100 as in the above embodiment. The main board is electrically connected to the display panel 100, and is used to provide a driving signal to the display panel 100, thereby driving the display panel 100 to display a corresponding image. The display panel 100 can realize a transparent display function, and has high display transparency and high display brightness.

[0090] The above are only implementation methods of the present application, and are not intended to limit the patent protection scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A pixel structure, characterized in that: It comprises a plurality of sub-pixel units of different colors, wherein the plurality of sub-pixel units are arranged to form a ring, and a transparent display area is formed inside the ring; The sub-pixel unit includes a main light-emitting sub-unit and a reflective sub-unit arranged along the circumference of the ring; wherein the main light-emitting sub-unit includes a first reflective electrode, a light-emitting layer and a first transparent electrode stacked in sequence along the direction toward the transparent display area, so as to emit light toward the transparent display area; the reflective sub-unit includes a second transparent electrode, a light-emitting layer and a second reflective electrode stacked in sequence along the direction toward the transparent display area, and the second reflective electrode is used to reflect light back into the transparent display area.

2. The pixel structure according to claim 1, characterized in that: In each of the sub-pixel units, the main light-emitting sub-unit and the reflective sub-unit are arranged adjacent to each other; the main light-emitting sub-unit of each of the sub-pixel units is arranged adjacent to the reflective sub-unit of the adjacent sub-pixel unit.

3. The pixel structure according to claim 1, characterized in that: The pixel structure includes three sub-pixel units of different colors, and the three sub-pixel units are arranged to form a hexagonal ring.

4. The pixel structure according to any one of claims 1 to 3, characterized in that: Along the circumference of the transparent display area, an extension length of the main light-emitting subunit is greater than an extension length of the reflective subunit.

5. The pixel structure according to claim 4, characterized in that: The main light-emitting subunit of each sub-pixel unit and the reflective subunit of an adjacent sub-pixel unit are arranged parallel to each other.

6. The pixel structure according to claim 1, characterized in that: Along a direction perpendicular to the pixel structure, the light emitting layer includes a first surface and a second surface opposite to each other; In the main light-emitting subunit, the first reflective electrode extends from the side of the light-emitting layer to the first surface, and the first reflective electrode covers the side of the light-emitting layer away from the transparent display area and the first surface; the main light-emitting subunit also includes a first reflective sub-electrode arranged on the second surface, the first reflective sub-electrode is in contact with and electrically connected to the first transparent electrode to form a first anode electrode, and the first anode electrode covers the side of the light-emitting layer close to the transparent display area and the second surface; the first reflective electrode is insulated from the first anode electrode; In the reflective subunit, the second reflective electrode extends from the side of the light-emitting layer to the first surface, and the second reflective electrode covers the side of the light-emitting layer close to the transparent display area and the first surface; the reflective subunit also includes a second reflective sub-electrode arranged on the second surface, the second reflective sub-electrode is in contact and electrically connected with the second transparent electrode to form a second anode electrode, and the second anode electrode covers the side of the light-emitting layer close to the transparent display area and the second surface; the second reflective electrode is insulated from the second anode electrode.

7. A display panel, characterized in that: include: Driver substrate; A plurality of pixel structures as described in any one of claims 1 to 6 are disposed on the driving substrate and electrically connected to the driving substrate.

8. The display panel according to claim 7, characterized in that: The pixel structure includes three sub-pixel units of different colors, and the three sub-pixel units are arranged to form a hexagonal ring; a plurality of the pixel structures are spliced ​​together to form a honeycomb structure.

9. The display panel according to claim 8, characterized in that: The sides of two adjacent pixel structures close to each other share the same pixel subunit; the shared pixel subunit serves as the main light-emitting subunit of one of the pixel structures and as the reflective subunit of the other pixel structure; or, The main light-emitting subunit of the pixel structure is arranged adjacent to the main light-emitting subunit of the adjacent pixel structure, and the reflective subunits of every six adjacent pixel structures are arranged to form a hexagon, a transparent sub-display area is formed inside the hexagon, and the reflective subunit emits light toward the transparent sub-display area.

10. A method for preparing a display panel, characterized in that: include: Make a drive substrate; Producing a plurality of light-emitting layers of different colors on the driving substrate; A reflective electrode and a transparent electrode are respectively formed on two opposite sides of each light-emitting layer to form a main light-emitting subunit or a reflective subunit; Each of the main light-emitting units and the corresponding reflective sub-unit constitute a sub-pixel unit, and a plurality of sub-pixel units of different colors are arranged to form a ring, a transparent display area is formed inside the ring, and the transparent display area and the surrounding plurality of sub-pixel units constitute a pixel structure; in each of the pixel structures, the transparent electrode of the main light-emitting unit is located on a side close to the transparent display area, so that the main light-emitting unit emits light toward the transparent display area; The reflective electrode of the reflective subunit is located at a side close to the transparent display area, so as to reflect light back into the transparent display area.

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