Display panel

Abstract

The utility model discloses a display panel. The display panel comprises a substrate; the pixel definition layer is located on one side of the substrate, the pixel definition layer comprises a body part, and a plurality of openings are defined by the body part; at least part of the light-emitting layer is located in the opening; the light reflecting layer is located on the side wall of the opening. The light emitted by the light-emitting layer is emitted to the light reflecting layer and can be reflected by the light reflecting layer from the opening, so that the light extraction effect of the display panel can be improved. In addition, the display panel is low in production cost and beneficial to popularization and application.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of display technology, and in particular to a display panel. Background Art

[0002] Organic Electroluminescence Display (OLED) display panels have been widely used due to their excellent properties such as high brightness, high efficiency, wide viewing angle, and autonomous luminescence.

[0003] In order to improve the light extraction rate of OLED display panels, micro lens array (MLA) technology is currently often used to improve light extraction. A microcavity structure is prepared in the light-emitting device to reduce the optical waveguide effect and reduce total reflection. However, the process for preparing MLA technology is complicated and requires strict and precise alignment and etching processes. It has high requirements on the quality of the equipment and the preparation process, and is expensive. Utility Model Content

[0004] The utility model provides a display panel to improve the light extraction effect of the display panel and reduce the cost of the display panel.

[0005] In a first aspect, an embodiment of the utility model provides a display panel, comprising:

[0006] substrate;

[0007] A pixel definition layer is located on one side of the substrate, the pixel definition layer includes a main body portion, and the main body portion encloses a plurality of openings;

[0008] a light-emitting layer, at least partially located in the opening;

[0009] The light reflecting layer is located on the side wall of the opening.

[0010] Furthermore, the light-emitting layer is at least located at the bottom of the opening, and the display panel further includes:

[0011] A first electrode layer is at least partially located between the light-emitting layer and the substrate.

[0012] Furthermore, at least a portion of the first electrode layer is located on a side wall of the opening, and the first electrode layer located on the side wall of the opening serves as the light reflecting layer.

[0013] Furthermore, the light emitting layer is also located on a side of the sidewall of the opening that is away from the main body portion and on the side of the first electrode layer.

[0014] Furthermore, the display panel also includes a connection structure and a driving circuit layer, the driving circuit layer is located between the pixel definition layer and the substrate, the connection structure is located on the side of the driving circuit layer away from the substrate, and the connection structure connects the first electrode layer and the driving circuit layer respectively.

[0015] Furthermore, the light reflecting layer is in contact with the first electrode layer.

[0016] Furthermore, it also includes a driving circuit layer, wherein the driving circuit layer is located between the pixel definition layer and the substrate, and the first electrode layer is directly connected to the driving circuit layer.

[0017] Furthermore, it also includes:

[0018] A second electrode layer is located on a side of the light-emitting layer away from the substrate, wherein the orthographic projection of the second electrode layer on the substrate covers the orthographic projection of the light-emitting layer on the substrate and the orthographic projection of the light-reflecting layer on the substrate.

[0019] The insulating layer is at least partially located between the second electrode layer and the light reflecting layer.

[0020] Furthermore, the light reflecting layer further includes a set region located on a surface of the main body away from the substrate, and the set region is connected to the light reflecting layer located on a side wall of the opening.

[0021] Furthermore, an angle between a side wall of the opening and a bottom surface of the main body is less than or equal to 90 degrees, and the bottom surface of the main body is a surface close to the substrate.

[0022] The utility model provides a display panel and a display device, wherein the display panel includes a substrate; a pixel definition layer located on one side of the substrate, the pixel definition layer includes a main body, and the main body is enclosed to form a plurality of openings; at least a portion of the light-emitting layer is located in the opening; a light reflection layer is arranged on the side wall of the opening, and the light emitted by the light-emitting layer is directed toward the light reflection layer, and can be reflected from the opening by the light reflection layer, thereby improving the light extraction effect of the display panel. In addition, compared with the prior art, the display panel of the utility model can improve the light extraction effect of the display panel by arranging the light reflection layer on the side wall of the opening enclosed by the main body of the pixel definition layer, simplifying the production process of the display panel, with low production cost, which is conducive to popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a display panel provided in an embodiment of the utility model.

[0024] Figure 2 A schematic diagram of the structure of another display panel provided in an embodiment of the utility model.

[0025] Figure 3 A schematic diagram of the structure of another display panel provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0027] Figure 1 A schematic diagram of the structure of a display panel provided by an embodiment of the utility model is shown in FIG. Figure 1 As shown, the display panel includes: a substrate 101; a pixel definition layer 102, which is located on one side of the substrate 101, and the pixel definition layer 102 includes a main body 1021, and the main body 1021 encloses a plurality of openings 1022; a light-emitting layer 103, which is at least partially located in the opening 1022; and a light-reflecting layer 104, which is located on the side wall of the opening 1022.

[0028] The substrate 101 may be a rigid substrate or a flexible substrate. For example, the material of the rigid substrate may be glass, and the material of the flexible substrate may be a flexible material, such as polyimide. The pixel definition layer 102 includes a plurality of body parts 1021, the body parts 1021 enclose a plurality of openings 1022, and the light-emitting layer 103 is disposed in the openings 1022. The pixel definition layer 102 may be made of an organic material or an inorganic material.

[0029] Specifically, the light-emitting layer 103 is at least partially located in the opening 1022. In some optional embodiments of the present invention, the light-emitting layer 103 may include a light-emitting material layer, which may be an organic light-emitting material layer or an inorganic light-emitting material layer. In another optional embodiment of the present invention, the light-emitting layer 103 includes a stacked structure of a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer. Optionally, the light-emitting layer 103 may include a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, and color display is achieved by controlling the light emission of light-emitting layers of different colors.

[0030] Specifically, Figure 1As shown, the pixel definition layer 102 is located above the substrate 101, and the main body 1021 of the pixel definition layer 102 encloses a plurality of openings 1022. A light emitting layer 103 and a light reflecting layer 104 are formed in the openings 1022. The light reflecting layer 104 is located on the side walls on both sides of the openings 1022 and covers the side walls of the openings 1022. The light emitting layer 103 is located at the bottom of the openings 1022. A portion of the light emitted by the light emitting layer 103 is emitted from the openings 1022, and a portion is emitted toward the side walls of the openings 1022. By arranging the light reflecting layer 104 on the side walls of the openings 1022, the light reflecting layer 104 can reflect the incident light, and further reflect the light emitted by the light emitting layer 103 toward the side walls of the openings 1022 to be emitted above the openings 1022, so that more light emitted by the light emitting layer 103 can be emitted from above the openings 1022, thereby improving the light extraction efficiency of the display panel, thereby improving the light extraction effect of the display panel. Optionally, the light reflecting layer 104 may include a reflective metal.

[0031] In addition, compared with the prior art of improving the light extraction effect of the display panel through the MLA technology, the display panel of the embodiment of the utility model can improve the light extraction effect of the display panel only by setting a light reflecting layer 104 located on the side wall of the opening 1022. This embodiment can improve the light extraction effect of the display panel by setting a light reflecting layer, has a simple production process, and a low production cost, which is conducive to large-scale promotion and application.

[0032] The display panel of this embodiment includes a substrate; a pixel definition layer located on one side of the substrate, the pixel definition layer includes a main body, and the main body is surrounded to form a plurality of openings; at least part of the light-emitting layer is located in the opening; a light-reflecting layer is arranged on the side wall of the opening, and the light emitted by the light-emitting layer is directed toward the light-reflecting layer, and can be reflected from the opening by the light-reflecting layer, thereby improving the light extraction effect of the display panel. In addition, the display panel of the utility model can improve the light extraction effect of the display panel only by setting the light-reflecting layer, simplifying the production process of the display panel, and having a low production cost, which is conducive to popularization and application.

[0033] The present utility model also provides another display panel, which is a further improvement of the above embodiment. Figure 2 A schematic diagram of another display panel provided by an embodiment of the present utility model is shown in FIG. Figure 2 As shown, the light emitting layer 103 is at least located at the bottom of the opening 1022 , and the display panel further includes: a first electrode layer 106 , and the first electrode layer 106 is at least partially located between the light emitting layer 103 and the substrate 101 .

[0034] The first electrode layer 106 may include a metal layer and a transparent conductive layer arranged above and below the metal layer. The metal layer material of the first electrode layer 106 may be Ag, and the material of the transparent conductive layer may be ITO. A portion of the light emitted by the light emitting layer 103 is emitted from the opening 1022, and a portion is emitted toward the side wall of the opening 1022, and is reflected by the light reflecting layer 104 on the side wall of the opening 1022. The reflected light is emitted from the opening 1022, thereby improving the light extraction effect of the display panel.

[0035] In addition, reference Figure 1 , Figure 1 A first electrode layer 106 is also provided between the substrate 101 and the pixel definition layer 102 of the display panel, a second electrode layer 105 is also provided above the pixel definition layer 102, a light emitting layer 103 is located between the first electrode layer 106 and the second electrode layer 105, and the first electrode layer 106, the light emitting layer 103 and the second electrode layer 105 constitute a light emitting device. An insulating layer 107 is formed between the second electrode layer 105 and the light reflecting layer 104 to prevent the second electrode layer 105 and the light reflecting layer 104 from contacting each other.

[0036] Further, such as Figure 2 As shown, at least a portion of the first electrode layer 106 is located on the sidewall of the opening 1022 , and the first electrode layer 106 located on the sidewall of the opening 1022 serves as the light reflection layer 104 .

[0037] The first electrode layer 106 has a light reflection function. As mentioned above, the metal layer material of the first electrode layer 106 can be Ag, which can reflect the light emitted from the light-emitting layer 103 to the first electrode layer 106 .

[0038] Specifically, by utilizing the reflective effect of the first electrode layer 106, the first electrode layer 106 located on the side wall of the opening 1022 reflects the light emitted from the light-emitting layer 103 to the side wall of the opening 1022, thereby improving the light extraction effect of the display panel. By disposing a portion of the first electrode layer 106 on the side wall of the opening 1022, the first electrode layer 106 located on the side wall of the opening 1022 is used as the light reflecting layer 104, so that the light reflecting layer 104 can be formed integrally with the first electrode layer 106, thereby simplifying the manufacturing process of the light reflecting layer 104, thereby simplifying the production process of the display panel, and reducing the production cost of the display panel.

[0039] Optionally, the light emitting layer 103 is also located on a side of the first electrode layer 106 of the side wall of the opening 1022 away from the main body 1021 .

[0040] Specifically, the light-emitting layer 103 can extend to the side wall of the opening 1022 and be located on the side of the first electrode layer 106 away from the main body 1021, so that the light-emitting layer 103 can be isolated from the first electrode layer 106 and the second electrode layer 105 located above the light-emitting layer 103, avoiding contact between the first electrode layer 106 and the second electrode layer 105, so that there is no need to make an insulating layer between the light-reflecting layer 104 and the second electrode layer 105, simplifying the manufacturing process of the display panel, and at the same time increasing the light-emitting area of ​​the display panel and improving the display effect of the display panel. Compared with the existing method of improving the light extraction effect of the display panel through the MLA technology, the display panel of the embodiment of the utility model simplifies the production process of the display panel, has a low production cost, and is conducive to large-scale promotion and application.

[0041] For further information, please refer to Figure 2 , also includes a connecting structure 109 and a driving circuit layer 11, the driving circuit layer 11 is located between the pixel definition layer 102 and the substrate 101, the connecting structure 109 is located on the side of the driving circuit layer 11 away from 101, and the connecting structure 109 connects the first electrode layer 106 and the driving circuit layer 11 respectively.

[0042] Among them, Figure 2 As shown, the pixel definition layer 102 and the substrate 101 further include a planarization layer 111, a protective layer 112, a second interlayer insulating layer 113, a first interlayer insulating layer 114, a gate insulating layer 115 and a buffer layer 116 stacked in sequence from top to bottom. The driving circuit layer 11 also includes a thin film transistor 110 and a capacitor. The thin film transistor 110 includes an active layer, a gate 1104, a source 1101 and a drain 1106. The active layer includes a source region 1102, a channel region 1103 and a drain region 1105. In addition, the capacitor includes a first plate 117 located between the first interlayer insulating layer 114 and the gate insulating layer 115, and a second plate 118 between the second interlayer insulating layer 113 and the first interlayer insulating layer 114.

[0043] Specifically, since part of the first electrode layer 106 is located on the side wall of the opening 1022, and the first electrode layer 106 located on the side wall of the opening 1022 serves as the light reflecting layer 104, it is necessary to additionally make a connection structure 109 so that the first electrode layer 106 can be connected to the driving circuit layer 11. As described above, the first electrode layer 106, the light emitting layer 103, and the second electrode layer 105 form a light emitting device. The connection structure 109 connects the driving circuit layer 11 through a via hole penetrating the planarization layer 111 and the protective layer 112, so that the first electrode layer 106 can be connected to the driving circuit layer 11. The driving circuit layer 11 can output a driving current to the light emitting device through the connection structure, thereby controlling the light emitting layer 103 to emit light. The driving circuit layer 11 can adjust the light emitting brightness of the light emitting device by controlling the magnitude of the driving current. The greater the current, the higher the brightness, and vice versa.

[0044] Optionally, the connection structure 109 may be made of a material with low resistivity, for example, the connection structure 109 may be made of Ti / Al / Ti.

[0045] Figure 3 A schematic diagram of the structure of another display panel provided by an embodiment of the utility model is shown as follows: Figure 3 As shown, optionally, the light reflecting layer 104 and the first electrode layer 106 are connected.

[0046] The light reflecting layer 104 is made of a reflective material, and the material of the light reflecting layer 104 may be Ag.

[0047] Specifically, Figure 3 As shown, the light reflecting layer 104 of this embodiment is formed on the side wall of the opening 1022 and covers the side wall of the opening 1022. The light reflecting layer 104 can reflect the light emitted from the light emitting layer 103 toward the side wall of the opening 1022, and emit the light from above the opening 1022, thereby improving the light extraction efficiency of the display panel, thereby improving the light extraction effect of the display panel.

[0048] Furthermore, it also includes a driving circuit layer 11 , which is located between the pixel definition layer 102 and the substrate 101 , and the first electrode layer 106 is directly connected to the driving circuit layer 11 .

[0049] Among them, Figure 3As shown, the pixel definition layer 102 and the substrate 101 further include a planarization layer 111, a protective layer 112, a second interlayer insulating layer 113, a first interlayer insulating layer 114, a gate insulating layer 115 and a buffer layer 116 stacked from top to bottom. The driving circuit layer 11 also includes a thin film transistor 110 and a capacitor. The thin film transistor 110 includes an active layer, a gate 1104, a source 1101 and a drain 1106. The active layer includes a source region 1102, a channel region 1103 and a drain region 1105. A buffer layer 116 is provided between the active layer and the substrate, and a gate insulating layer 115 is provided between the film layer where the gate is located and the active layer. In addition, the capacitor includes a first plate 117 located between the first interlayer insulating layer 114 and the gate insulating layer 115, and a second plate 118 between the second interlayer insulating layer 113 and the first interlayer insulating layer 114. The gate and the first electrode 117 may be in the same layer, and a capacitor dielectric layer 114 is provided between the film layer where the first electrode 117 and the second electrode 118 are located. An interlayer insulating layer 113 is provided between the film layer where the second electrode 118 is located and the film layer where the source 1101 and the drain 1106 are located. The side of the second interlayer insulating layer 113 away from the substrate 101 may include a protective layer 112, and the side of the protective layer 112 away from the substrate 101 is provided with a planarization layer 111.

[0050] Specifically, the first electrode layer 106 is directly connected to the driving circuit layer 11, and the first electrode layer 106 is also in contact with the light-emitting layer 103, and there is no need to form a separate Figure 2 The connection structure 109 shown in FIG. The driving circuit layer 11 directly outputs a driving current to the first electrode layer 106 of the light-emitting device, thereby controlling the light-emitting layer 103 to emit light. The driving circuit layer 11 can adjust the light-emitting brightness of the light-emitting layer 103 by controlling the driving current of the light-emitting device. The greater the current, the higher the brightness, and vice versa.

[0051] Further, such as Figure 2 and Figure 3 As shown, the display panel also includes a second electrode layer 105, which is located on the side of the light-emitting layer 103 away from the substrate 101, and the orthographic projection of the second electrode layer 105 on the substrate 101 covers the orthographic projection of the light-emitting layer 103 on the substrate 101 and the orthographic projection of the light-reflecting layer 104 on the substrate 101; the insulating layer 107 is at least partially located between the second electrode layer 105 and the light-reflecting layer 104.

[0052] The second electrode layer 105 is a cathode and the first electrode layer 106 is an anode, or the second electrode layer 105 is an anode and the first electrode layer 106 is a cathode.

[0053] Specifically, Figure 2 and Figure 3As shown, the orthographic projection of the second electrode layer 105 on the pixel definition layer 102 covers the orthographic projections of the light emitting layer 103 and the light reflecting layer 104 on the substrate 101, that is, the second electrode layer 105 is located above the pixel definition layer 102, and the second electrode layer 105 covers the light emitting layer 103, the light reflecting layer 104 and the supporting structure 108. The insulating layer 107 is at least partially located between the second electrode layer 105 and the light reflecting layer 104, which can isolate the second electrode layer 105 and the light reflecting layer 104, and prevent the second electrode layer 105 and the light reflecting layer 104 from contacting each other.

[0054] Further, such as Figure 2 and Figure 3 As shown, the light reflection layer 104 further includes a set region 1041 located on a surface of the main body 1021 away from the substrate 101 , and the set region 1041 is connected to the light reflection layer 104 located on the side wall of the opening 1022 .

[0055] Specifically, the portion of the light reflecting layer 104 covering the upper surface of the main body 1021 is the set area 1041, that is, the light reflecting layer 104 can cover a portion of the upper surface of the main body 1021, so that the light reflecting layer 104 can completely cover the side wall of the opening 1022 during the manufacturing process, so that the reflection effect of the light reflecting layer 104 covering the side wall of the opening 1022 can be utilized to reflect the light from the light-emitting layer 103, so that the light emitted from the light-emitting layer 103 to the side wall of the opening 1022 can be reflected out of the opening 1022, thereby improving the light extraction efficiency of the display panel and thus improving the light extraction effect of the display panel.

[0056] On the basis of the above embodiments, optionally, the angle between the side wall of the opening 1022 and the bottom surface of the main body 1021 is less than or equal to 90 degrees, and the bottom surface of the main body 1021 is a surface close to the substrate 101 .

[0057] Specifically, the angle between the side wall of the opening 1022 and the bottom surface of the main body 1021 is less than or equal to 90 degrees, so that the opening 1022 is an inverted trapezoid or a rectangle, so that the light emitted from the light-emitting layer 103 to the side wall of the opening 1022 can be reflected out of the opening 1022 by the light-reflecting layer 104, thereby improving the light output efficiency of the display panel, thereby improving the light extraction effect of the display panel.

[0058] The technical solution of the embodiment of the utility model is that the light reflecting layer is arranged on the side wall of the opening, and the light reflecting layer can be formed integrally with the first electrode layer, or formed separately; when the light reflecting layer and the first electrode layer are formed integrally, a connection structure is added to connect the first electrode layer to the driving circuit layer; when the light reflecting layer is formed separately, the first electrode layer is directly connected to the driving circuit layer. The light reflecting layer can reflect the light emitted by the light emitting layer to the side wall of the opening out of the opening, thereby improving the light extraction effect of the display panel. In addition, the display panel of the utility model has a low production cost, which is conducive to popularization and application.

[0059] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: include: substrate; A pixel definition layer is located on one side of the substrate, the pixel definition layer includes a main body portion, and the main body portion encloses a plurality of openings; a light-emitting layer, at least partially located in the opening; The light reflecting layer is located on the side wall of the opening.

2. The display panel according to claim 1, characterized in that: The light emitting layer is at least located at the bottom of the opening, and the display panel further includes: A first electrode layer is at least partially located between the light-emitting layer and the substrate.

3. The display panel according to claim 2, characterized in that: At least a portion of the first electrode layer is located on the side wall of the opening, and the first electrode layer located on the side wall of the opening serves as the light reflection layer.

4. The display panel according to claim 3, characterized in that: The light emitting layer is also located on a side of the sidewall of the opening on which the first electrode layer is away from the main body.

5. The display panel according to claim 3, characterized in that: It also includes a connection structure and a driving circuit layer, wherein the driving circuit layer is located between the pixel definition layer and the substrate, the connection structure is located on a side of the driving circuit layer away from the substrate, and the connection structure connects the first electrode layer and the driving circuit layer respectively.

6. The display panel according to claim 2, characterized in that: The light reflecting layer is in contact with the first electrode layer.

7. The display panel according to claim 6, characterized in that: It also includes a driving circuit layer, which is located between the pixel definition layer and the substrate, and the first electrode layer is directly connected to the driving circuit layer.

8. The display panel according to any one of claims 3 to 7, characterized in that: Also includes: A second electrode layer is located on a side of the light-emitting layer away from the substrate, wherein an orthographic projection of the second electrode layer on the substrate covers an orthographic projection of the light-emitting layer on the substrate and an orthographic projection of the light-reflecting layer on the substrate; The insulating layer is at least partially located between the second electrode layer and the light reflecting layer.

9. The display panel according to claim 1, characterized in that: The light reflection layer further includes a set region located on a surface of the body portion away from the substrate, and the set region is connected to the light reflection layer located on a side wall of the opening.

10. The display panel according to any one of claims 1 to 9, characterized in that: The included angle between the side wall of the opening and the bottom surface of the main body is less than or equal to 90 degrees, and the bottom surface of the main body is a surface close to the substrate.

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