Display panel and display device

Abstract

The application relates to a display panel and a display device, the display panel comprising: a substrate; a pixel definition layer arranged on one side of the substrate and defining a first opening; a first electrode layer between the substrate and the pixel definition layer, and part of the first electrode layer being exposed in the first opening; a light-emitting functional layer arranged on the side, away from the substrate, of the first electrode layer and at least partially located in the first opening; a sub-pixel definition layer arranged on the side, away from the substrate, of the first electrode layer exposed in the first opening; and the light-emitting functional layer comprising at least two sub-light-emitting functional layer units arranged at intervals, and two adjacent sub-light-emitting functional units being separated by the sub-pixel definition layer; and a light extraction layer arranged on the side, away from the substrate, of the light-emitting functional layer, and the light extraction layer being arranged correspondingly to the light-emitting functional layer. The application divides the light-emitting functional layer into multiple parts by arranging the sub-pixel definition layer on the anode layer, and sets the light extraction layer above the light-emitting functional layer, thereby effectively converging large-angle light and improving the forward light-out effect.

Description

Technical Field

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

[0002] OLED stands for Organic Light Emitting Diode, an active light-emitting device with a sandwich structure consisting of multiple organic layers and electrodes on both sides. Because OLEDs emit light in all directions, large-angle light cannot escape properly due to reflection and refraction at the film interfaces. Therefore, there is a problem of low forward light emission and low forward brightness. Improving light emission efficiency has become a continuous challenge.

[0003] In existing technologies, forward light emission rate is usually improved by setting a pixel definition layer (PDL) and a wrapping layer, but the effect is not ideal.

[0004] The invention patent with authorization announcement number CN 109873023B specifically discloses an OLED display substrate, its preparation method, and a display device. In this invention, the OLED display substrate has a reflective film layer inserted at an angle within the pixel defining structure, reflecting any light leakage that may occur in the pixel's light-emitting area back to the pixel area, thereby avoiding light leakage and improving luminous efficiency. However, there is still considerable room for improvement in its luminous efficiency. Summary of the Invention

[0005] Based on this, it is necessary to provide a display panel and display device to address the aforementioned technical problems in the prior art. The present invention divides the light-emitting functional layer into multiple parts by setting a sub-pixel limiting layer on the anode layer, and sets a light extraction layer above the light-emitting functional layer, which can effectively converge large-angle light and improve the forward light emission effect.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] A display panel, comprising:

[0008] substrate;

[0009] A pixel definition layer is disposed on one side of the substrate and defines a first opening;

[0010] A first electrode layer is located between the substrate and the pixel definition layer, and a portion of the first electrode layer is exposed in the first opening;

[0011] A light-emitting functional layer is disposed on the side of the first electrode layer away from the substrate and is at least partially located in the first opening;

[0012] A sub-pixel definition layer is disposed on the side of the first electrode layer exposed in the first opening away from the substrate; the light-emitting functional layer includes at least two sub-light-emitting functional units disposed at intervals, with adjacent sub-light-emitting functional units separated by the sub-pixel definition layer;

[0013] The light extraction layer is located on the side of the light-emitting functional layer away from the substrate. The light extraction layer is positioned corresponding to the light-emitting functional layer and is used to extract the large-angle light from the light-emitting functional layer in the forward direction.

[0014] This invention divides the light-emitting functional layer into multiple parts by setting a sub-pixel limiting layer on the anode layer, and sets a light extraction layer above the light-emitting functional layer, which can effectively gather large-angle light and improve the forward light emission effect.

[0015] In one feasible implementation, the orthogonal projection of the light-emitting functional layer on the substrate lies within the orthogonal projection of the light-extracting layer on the substrate.

[0016] Preferably, the light extraction layer is configured as a convex lens that protrudes in a direction away from the substrate.

[0017] In one feasible implementation, the light extraction layer includes a light extraction unit, and the light extraction unit is configured in correspondence with the sub-light emission functional unit;

[0018] Preferably, the light extraction unit and the sub-light emission functional unit are arranged in a one-to-one correspondence;

[0019] Preferably, the orthographic projection of the sub-light-emitting functional unit on the substrate is located within the orthographic projection of the light extraction unit on the substrate. By setting multiple light extraction units corresponding one-to-one with the sub-light-emitting functional units, the effective refraction area is increased, which is beneficial for the emission of large-angle light.

[0020] In one feasible implementation, the display panel further includes an encapsulation layer disposed on the side of the pixel definition layer away from the substrate and located between the pixel definition layer and the light extraction layer;

[0021] Preferably, the encapsulation layer comprises a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked sequentially, with the first inorganic encapsulation layer being closer to the pixel definition layer than the second inorganic encapsulation layer. The encapsulation layer protects its internal film layers from external environmental influences, extends the lifespan of the display panel, and ensures stable display performance.

[0022] In one feasible implementation, the display panel further includes a refractive layer disposed between the first inorganic encapsulation layer and the organic encapsulation layer, with the refractive index of the refractive layer being greater than that of the organic encapsulation layer. The refractive layer allows light originally contained within the first inorganic encapsulation layer to be extracted to the interface between the refractive layer and the organic encapsulation layer, reflected to the pixel definition layer, and then emitted in the forward direction.

[0023] Preferably, the material of the refractive layer includes organic materials.

[0024] In one feasible implementation, the pixel definition layer includes a first pixel definition layer and a second pixel definition layer. The first pixel definition layer includes an end face facing the light-emitting functional layer and a first reflective layer is disposed on the end face. The second pixel definition layer is disposed between the light-emitting functional layer and the first reflective layer and completely covers the first reflective layer and covers at least a portion of the surface of the first pixel definition layer away from the substrate. The second pixel definition layer includes an insulating material.

[0025] Preferably, the reflectivity of the first reflective layer is greater than or equal to 70%. By setting the first reflective layer, light can be reflected in the direction of normal viewing. By setting the insulating layer, the first electrode layer and the second electrode layer are prevented from conducting through the first reflective layer.

[0026] Preferably, the end face of the first pixel definition layer is a slope, the angle between the plane of the slope and the substrate is between 50° and 75°, and the height of the slope is between 3µm and 5µm. Compared with the prior art, the increased angle and height of the slope enhance the reflection of the slope, which can reflect large-angle light rays emitted from the slope to the frontal direction, thereby improving the forward light emission.

[0027] Preferably, the sub-pixel definition layer includes a third pixel definition layer and a fourth pixel definition layer. The third pixel definition layer is disposed on the first electrode layer and located between two adjacent sub-light-emitting functional units. The third pixel definition layer is higher than the sub-light-emitting functional units. The fourth pixel definition layer covers the third pixel definition layer and includes an insulating material.

[0028] Preferably, the third pixel definition layer is made of the same material as the first pixel definition layer; the fourth pixel definition layer is made of the same material as the second pixel definition layer. Using the same material for the sub-pixel definition layers and the pixel definition layers allows for simultaneous fabrication, reducing manufacturing costs; it also ensures high consistency and a more symmetrical structure.

[0029] In one feasible implementation, the display panel further includes a second electrode layer, which is partially located on the side of the light-emitting functional layer away from the substrate and partially located between the encapsulation layer and the pixel definition layer.

[0030] Preferably, the first electrode layer is an anode and the second electrode layer is a cathode.

[0031] In one feasible implementation, the display panel further includes a planarization layer disposed on the side of the encapsulation layer away from the substrate, and covering the encapsulation layer and the light extraction layer;

[0032] Preferably, the refractive index of the planarization layer is lower than that of the light extraction layer. The combination of the refractive indices of the planarization layer and the light extraction layer can effectively converge large-angle light and improve the forward light extraction effect.

[0033] In one feasible implementation, the display panel further includes a reflective structure disposed on the side of the first inorganic encapsulation layer away from the substrate, and the organic encapsulation layer covers the reflective structure. The orthographic projection of the reflective structure onto the substrate is offset from the orthographic projection of the light-emitting functional layer onto the substrate. This arrangement can reflect light at a large angle, improving the forward light emission effect.

[0034] Alternatively, the reflective structure is disposed on the side of the second inorganic encapsulation layer away from the substrate, and the planarization layer covers the reflective structure, with the orthographic projection of the reflective structure on the substrate being offset from the orthographic projection of the light-emitting functional layer on the substrate.

[0035] Preferably, the reflective structure includes a light-shielding layer disposed on the second inorganic encapsulation layer and a second reflective layer covering the surface of the light-shielding layer;

[0036] Preferably, the reflective structure is arranged around the light extraction layer. The reflective structure can reflect light that the light extraction layer cannot refract, thus improving the forward light emission effect. The light-shielding layer can reduce light crosstalk and absorb ambient light, thereby improving the forward light emission effect.

[0037] To solve the above technical problems, another technical solution adopted by the present invention is:

[0038] A display device includes a display panel as described above.

[0039] Due to the adoption of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0040] 1. The present invention divides the light-emitting functional layer into multiple parts by setting the sub-pixel limiting layer on the anode layer, and sets a light extraction layer above the light-emitting functional layer, which can effectively gather large-angle light and improve the forward light emission effect.

[0041] 2. This invention provides a light extraction layer and a planarization layer on the encapsulation layer. The refractive index of the planarization layer is lower than that of the light extraction layer, which can converge large-angle light and improve the forward light output effect.

[0042] 3. In this invention, a first reflective layer is set on the slope of the first pixel definition layer. Compared with the conventional method, the angle is increased and the height is increased, which is beneficial to improve the slope reflection and can reflect light to the frontal direction, thereby improving the forward light output effect.

[0043] 4. The present invention provides a refractive layer on the first inorganic encapsulation layer, which can extract the light originally in the first inorganic encapsulation layer to the interface between the refractive layer and the organic encapsulation layer, reflect it to the slope of the pixel definition layer, and then emit light in the forward direction, thereby improving the forward light emission effect.

[0044] 5. The present invention can be designed and segmented according to specific sub-light-emitting functional units, which can further increase and enhance the effect;

[0045] 6. The present invention features a reflective structure that can reflect light at a wide angle, thereby improving the forward light output effect. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of a display panel structure in the prior art;

[0047] Figure 2 This is a schematic diagram of the display panel structure of Example 1;

[0048] Figure 3 This is a schematic diagram of the sub-luminescent functional unit division in Example 1;

[0049] Figure 4 Other schematic diagrams showing the division of sub-light-emitting functional units;

[0050] Figure 5 This is a schematic diagram of the display panel structure in Example 2;

[0051] Figure 6 This is a schematic diagram of the display panel structure in Example 3;

[0052] Figure 7 This is a schematic diagram of the display panel structure in Example 4;

[0053] Figure 8 This is a schematic diagram of the display panel structure in Example 5;

[0054] Figure 9 This is a schematic diagram of the deformed structure of the display panel in Example 5;

[0055] Figure 10 This is a schematic diagram of the display panel structure in Example 6;

[0056] Figure 11 For Example 3, the display panel and Figure 1 The displayed chart shows a comparison of brightness trends across different display panels.

[0057] The structure includes: 1. Pixel definition layer; 100. First pixel definition layer; 110. Second pixel definition layer; 120. First reflective layer; 130. Sub-pixel definition layer; 131. Third pixel definition layer; 132. Fourth pixel definition layer; 140. First opening; 2. Encapsulation layer; 21. First inorganic encapsulation layer; 22. Organic encapsulation layer; 23. Second inorganic encapsulation layer; 3. First electrode layer; 4. Light-emitting functional layer; 41. Sub-light-emitting functional unit; 5. Light extraction layer; 51. Light extraction unit; 6. Planarization layer; 7. Refractive layer; 8. Reflective structure; 81. Light-shielding layer; 82. Second reflective layer; 9. Second electrode layer; 10. Substrate. Detailed Implementation

[0058] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0059] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," "up," "down," and similar expressions used in this document are for illustrative purposes only.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In this application, " / " means "or".

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0062] Because OLEDs emit light in all directions, light at large angles cannot be emitted normally due to reflection and refraction at the film interface. Therefore, there is a problem of less forward-emitted light and low forward brightness. How to improve the light emission efficiency has become a problem that needs to be continuously improved.

[0063] like Figure 1 As shown, in the prior art, the forward light emission rate is usually improved by setting a pixel definition layer 1 and an encapsulation layer 2. However, since the light is emitted in all directions, the light at large angles cannot be emitted normally due to reflection and refraction at the film layer interface, resulting in less forward emitted light.

[0064] Based on this, in order to converge wide-angle light and improve the forward light emission effect, the present invention provides a display panel and a display device. A display panel includes:

[0065] substrate;

[0066] A pixel definition layer is disposed on one side of the substrate and defines a first opening;

[0067] A first electrode layer is located between the substrate and the pixel definition layer, and a portion of the first electrode layer is exposed in the first opening;

[0068] A light-emitting functional layer is disposed on the side of the first electrode layer away from the substrate and is at least partially located in the first opening;

[0069] A sub-pixel definition layer is disposed on the side of the first electrode layer exposed in the first opening away from the substrate; the light-emitting functional layer includes at least two sub-light-emitting functional units disposed at intervals, with adjacent sub-light-emitting functional units separated by the sub-pixel definition layer;

[0070] The light extraction layer is located on the side of the light-emitting functional layer away from the substrate. The light extraction layer is positioned corresponding to the light-emitting functional layer and is used to extract the large-angle light from the light-emitting functional layer in the forward direction.

[0071] This invention divides the light-emitting functional layer into multiple parts by setting a sub-pixel limiting layer on the anode layer, and sets a light extraction layer above the light-emitting functional layer, which can effectively gather large-angle light and improve the forward light emission effect.

[0072] The present invention will be described in detail below with reference to specific embodiments.

[0073] Example 1

[0074] This embodiment of the display panel may include a display area and a non-display area disposed outside the display area. The display area may have various suitable shapes, such as circular, elliptical, or polygonal shapes. The display area is the area for displaying images and may include light-emitting structures. The non-display area is the area not designed to provide images, and pads connected to driver integrated circuits (ICs) or printed circuit boards may be arranged in the non-display area.

[0075] like Figure 2-4 As shown, specifically, the display panel in this embodiment may include a substrate 10, a pixel definition layer 1, a sub-pixel definition layer 130, a first electrode layer 3, a light-emitting functional layer 4, a second electrode layer 9, an encapsulation layer 2, a lens layer 5, and a planarization layer 6.

[0076] In this embodiment, the substrate 10 may include glass and / or polymer resin.

[0077] This embodiment may also include a thin-film transistor disposed on the substrate 10, and a planarization layer disposed on the thin-film transistor.

[0078] In this embodiment, a pixel definition layer 1 is disposed on one side of the substrate 10 and defines a first opening 140. A first electrode layer 3 is located between the substrate 10 and the pixel definition layer 1, and a portion of the first electrode layer 2 is exposed in the first opening 140. The pixel definition layer 1 can cover the end of the first electrode layer 3. A light-emitting functional layer 4 is disposed on the side of the first electrode layer 2 away from the substrate 10 and located in the first opening 140. The light-emitting functional layer 4 includes an electron transport layer, a hole transport layer, a light-emitting material layer, etc.

[0079] In this embodiment, the sub-pixel definition layer 130 is disposed on the side of the first electrode layer 3 exposed in the first opening 140 away from the substrate 10, and the light-emitting functional layer 4 includes at least two sub-light-emitting functional units 41 disposed at intervals, with adjacent sub-light-emitting functional units 41 separated by the sub-pixel definition layer 130.

[0080] Figure 3-4 This is a schematic diagram illustrating the shape of the light-emitting functional layer 4 divided by the sub-pixel definition layer 130. Wherein, Figure 4 (a) The shape of the sub-light-emitting functional unit 41 can be triangular. Figure 4 (b) The shape of the sub-light-emitting functional unit 41 can be circular. Figure 4 (c) The shape of the sub-light-emitting functional unit 41 can be a grid or similar shape. The segmentation can be designed according to the specific size of the sub-light-emitting functional unit 41, which can further enhance the effect.

[0081] In this embodiment, the light extraction layer 5 is disposed on the side of the light-emitting functional layer 4 away from the substrate 10. The light extraction layer 5 is disposed correspondingly to the light-emitting functional layer 4 and is used to extract the large-angle light from the light-emitting functional layer 4 in the forward direction. Specifically, the light extraction layer 5 is configured as a convex lens protruding in the direction away from the substrate 10, and the orthogonal projection of the light-emitting functional layer 4 on the substrate 10 is located within the orthogonal projection of the light extraction layer 5 on the substrate 10.

[0082] In this embodiment, the planarization layer 6 is disposed on the side of the encapsulation layer 2 away from the substrate 10, and completely covers the encapsulation layer 2 and the light extraction layer 5. Specifically, the planarization layer 6 is made of a low-refractive-index photoresist material and completely covers the second inorganic encapsulation layer 23 and the light extraction layer 5. The light extraction layer 5 is patterned into a lens shape using a high-refractive-index photoresist material, and the refractive index of the planarization layer 6 is lower than that of the light extraction layer 5. The combination of the refractive indices of the planarization layer 6 and the light extraction layer 5 can effectively converge large-angle light and improve the forward light extraction effect.

[0083] In this embodiment, the encapsulation layer 2 is disposed on the side of the pixel definition layer 1 away from the substrate 10, and is located between the pixel definition layer 1 and the light extraction layer 5, completely covering the pixel definition layer 1 and the light-emitting functional layer 4. Specifically, the encapsulation layer 2 includes a first inorganic encapsulation layer 21, an organic encapsulation layer 22, and a second inorganic encapsulation layer 23 stacked sequentially. The first inorganic encapsulation layer 21 is closer to the pixel definition layer 1 than the second inorganic encapsulation layer 23, and the light extraction layer 5 is disposed on the second inorganic encapsulation layer 23.

[0084] In this embodiment, the second electrode layer 9 is partially located on the side of the light-emitting functional layer 4 away from the substrate 10, and partially located between the encapsulation layer 2 and the pixel definition layer 1. Specifically, the first electrode layer 3 is the anode, and the second electrode layer 9 is the cathode.

[0085] In this embodiment, the large-angle light emitted by the sub-light-emitting functional unit 41 can be refracted by the convex lens structure of the light extraction layer 5, thereby emitting light from the front and improving the front light emission effect.

[0086] In this embodiment, the light-emitting functional layer 4 is divided into multiple parts by setting the sub-pixel limiting layer 130 on the anode layer, and a light extraction layer 5 is set above the light-emitting functional layer 4, which can effectively gather large-angle light and improve the forward light emission effect.

[0087] Example 2

[0088] like Figure 5 As shown, this embodiment further improves the structure based on embodiment 1.

[0089] In this embodiment, the light extraction layer 5 includes a light extraction unit 51, which is correspondingly configured with a sub-light emission functional unit 41. Specifically, the light extraction unit 51 and the sub-light emission functional unit 41 are configured in a one-to-one correspondence.

[0090] In this embodiment, the orthographic projection of the sub-light-emitting functional unit 41 on the substrate 10 is located within the orthographic projection of the light extraction unit 51 on the substrate 10. Other structures in this embodiment are the same as or similar to those in Embodiment 1.

[0091] In this embodiment, the large-angle light emitted by the sub-light-emitting functional unit 41 can be refracted by the convex lens structure of the light extraction unit 51, thereby emitting light from the front and improving the front light emission effect.

[0092] In this embodiment, multiple light extraction units 51 are configured to correspond one-to-one with sub-light emission functional units 41, thereby increasing the effective refraction area, which is beneficial for the emission of large-angle light and improves the forward light emission effect.

[0093] Example 3

[0094] like Figure 6As shown, this embodiment further improves the structure based on embodiment 2.

[0095] Specifically, the pixel definition layer 1 includes a first pixel definition layer 100 and a second pixel definition layer 110. The first pixel definition layer 100 is disposed in the non-display area and includes an end extending toward the first opening 140. The end of the first pixel definition layer 100 covers the end of the first electrode layer 3 and has a gap with the light-emitting functional layer 4. The end face of the first pixel definition layer 100 is a slope. The first pixel definition layer 100 can be an organic material and / or an inorganic material. In this embodiment, a first reflective layer 120 is disposed on the slope of the first pixel definition layer 100. The first reflective layer 120 completely covers the slope of the first pixel definition layer 100 and has a gap with the light-emitting functional layer 4. The first reflective layer 120 forms a continuous curved surface surrounding the pixel light-emitting area. The first reflective layer 120 can be metal or other reflective materials, and the reflectivity of the first reflective layer 120 is greater than or equal to 70%. By providing the first reflective layer 120, more large-angle light can be reflected to the frontal viewing direction, improving the forward light output.

[0096] In this embodiment, the angle α between the plane of the slope of the first pixel definition layer 100 and the substrate 10 is between 50° and 75°, and the height H of the slope is between 3um and 5um. Compared with the prior art, the angle of the slope is increased and the height is increased, which can improve the slope reflection and reflect the large-angle light emitted to the slope to the frontal direction, thereby improving the forward light output.

[0097] The second pixel definition layer 110 is disposed between the light-emitting functional layer 4 and the first reflective layer 120, and completely covers the first reflective layer and at least a portion of the surface of the first pixel definition layer away from the substrate. Specifically, one end of the second pixel definition layer 110 completely covers the reflective layer 120, and the other end extends into the non-display area to completely cover the first pixel definition layer 100. The second pixel definition layer 110 includes an insulating material, which can be an organic or inorganic insulating material. In this embodiment, the second pixel definition layer 110, as an insulating layer, can prevent the first electrode layer 3 and the second electrode layer 9 from being connected through the slope metal of the first reflective layer 120.

[0098] The sub-pixel definition layer 130 includes a third pixel definition layer 131 and a fourth pixel definition layer 132. The third pixel definition layer 131 is disposed on the first electrode layer 3 and located between two adjacent sub-light-emitting functional units 41. The upper surface of the third pixel definition layer 131 is higher than the upper surface of the sub-light-emitting functional unit 41. The end face of the third pixel definition layer 131 facing the sub-light-emitting functional unit 41 is set as a slope. The orthographic projection of the upper surface of the third pixel definition layer 131 on the substrate 10 is within the range of the orthographic projection of the lower surface of the third pixel definition layer 131 on the substrate 10 and does not coincide. The fourth pixel definition layer 132 covers the third pixel definition layer 131 and includes an insulating material. The third pixel definition layer 131 and the first pixel definition layer 100 can be made of the same material, and the fourth pixel definition layer 132 and the second pixel definition layer 110 can be made of the same material. In the fabrication process, the third pixel definition layer 131 and the first pixel definition layer 100 can be fabricated together, and the fourth pixel definition layer 132 and the second pixel definition layer 110 can be fabricated together, thereby reducing the process cost.

[0099] The other structures in this embodiment are the same as or similar to those in Embodiment 2.

[0100] In this embodiment, the transverse light emitted by the sub-light-emitting functional unit 41 can be reflected by the first reflective layer 120, thereby emitting light from the front and improving the front light emission effect.

[0101] Example 4

[0102] like Figure 7 As shown, this embodiment further improves the structure based on embodiment 3.

[0103] This embodiment of the display panel includes a refractive layer 7. Specifically, the refractive layer 7 is disposed between the first inorganic encapsulation layer 21 and the organic encapsulation layer 22, and the refractive layer 7 is made of a high refractive index material, including organic materials. Furthermore, the refractive index of the refractive layer 7 is greater than the refractive index of the organic encapsulation layer 22.

[0104] In this embodiment, the light emitted by the sub-light-emitting functional unit 41 can be totally reflected by the refractive layer 7 to the first reflective layer 120, and then reflected by the first reflective layer 120, thereby emitting light from the front and improving the front light emission effect.

[0105] The refractive layer 7 in this embodiment can extract the light originally in the first inorganic encapsulation layer 21 to the interface between the refractive layer 7 and the organic encapsulation layer 22, reflect it to the first reflective layer 120 set on the slope surface of the first pixel definition layer 100, and then reflect it in the forward direction to improve the light output effect.

[0106] The other structures in this embodiment are the same as or similar to those in Embodiment 3.

[0107] Example 5

[0108] like Figure 8 As shown, this embodiment is a further improvement on embodiment 3.

[0109] This embodiment of the display panel includes a reflective structure 8. Specifically, the reflective structure 8 is disposed on the side of the first inorganic encapsulation layer 21 away from the substrate 10, and the organic encapsulation layer 22 covers the reflective structure 8. The orthographic projection of the reflective structure 8 on the substrate 10 is offset from the orthographic projection of the light-emitting functional layer 4 on the substrate 10. The end face of the reflective structure 8 is set as a slope, and the orthographic projection of the upper surface of the reflective structure 8 on the substrate 10 is within the range of the orthographic projection of the lower surface of the reflective structure 8 on the substrate 10 and does not coincide with it.

[0110] In this embodiment, the light emitted by the sub-light-emitting functional unit 41 can be reflected by the reflective structure 8, thereby emitting light from the front and improving the front light emission effect.

[0111] In this embodiment, the reflective structure 8 is placed on the first inorganic encapsulation layer 21, which can reflect light at a large angle and improve the forward light emission effect.

[0112] Figure 9 As a variation of this embodiment, the reflective structure 8 is disposed on the side of the second inorganic encapsulation layer 23 away from the substrate 10, and the planarization layer 6 covers the reflective structure 8. The reflective structure 8 surrounds the lens-shaped light extraction layer 5, and the orthographic projection of the reflective structure 8 on the substrate 10 is offset from the orthographic projection of the light-emitting functional layer 4 on the substrate 10. The end face of the reflective structure 8 is set as a slope, and the orthographic projection of the upper surface of the reflective structure 8 on the substrate 10 is within the range of the orthographic projection of the lower surface of the reflective structure 8 on the substrate 10 and does not coincide.

[0113] The other structures in this embodiment are the same as or similar to those in Embodiment 3.

[0114] In this embodiment, the light emitted by the sub-light-emitting functional unit 41 can be reflected by the reflective structure 8, thereby emitting light from the front and improving the front light emission effect.

[0115] In this embodiment, the reflective structure 8 is placed on the second inorganic encapsulation layer 23, which can reflect light at a large angle and improve the forward light output effect.

[0116] Example 6

[0117] like Figure 10 As shown, in this embodiment... Figure 9 Further improvements were made based on the illustrated embodiments.

[0118] Specifically, in this embodiment, the reflective structure 8 includes a light-shielding layer 81 disposed on the second inorganic encapsulation layer 23 and a second reflective layer 82 covering the light-shielding layer 81. The end face of the light-shielding layer 81 is set as a slope, and the orthographic projection of its upper surface on the substrate 10 is within the range of the orthographic projection of its lower surface on the substrate 10 and does not overlap. The second reflective layer 82 completely covers the surface of the light-shielding layer 81.

[0119] In this embodiment, the light emitted by the sub-light-emitting functional unit 41 can be reflected by the second reflective layer 82, thereby emitting light from the front and improving the front light emission effect.

[0120] In this embodiment, the light-shielding layer can reduce light crosstalk and absorb ambient light. The second reflective layer 82 can reflect light at a wide angle. The light-shielding layer and the second reflective layer 82 work together to improve the forward light emission effect.

[0121] The other structures in this embodiment are the same as or similar to those in Embodiment 3.

[0122] Comparison effect

[0123] like Figure 11 As shown, this is the display panel and... (The text abruptly ends here, so the translation stops as well.) Figure 1 The chart shows a comparison of brightness trends for existing display panels.

[0124] The results show that, taking blue light as an example, the display panel of Embodiment 3 of the present invention has a 72% increase in forward brightness compared with the display panel of the prior art.

[0125] Example 7

[0126] This embodiment provides a display device that includes any of the display panels described above. Therefore, this display device possesses all the beneficial effects described for any of the display panels described above, which will not be repeated here.

[0127] The display device can be any product or component with display function, such as televisions, laptops, handheld devices (smartphones, tablets, etc.), wearable devices (smart bracelets, wireless headphones, smartwatches, smart glasses, etc.), in-vehicle devices (navigation systems, reversing assistance systems, dashcams, car refrigerators, etc.), virtual reality devices, terminal devices, etc., without any restrictions.

[0128] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A display panel, characterized in that, include: substrate(10); A pixel definition layer (1) is disposed on one side of the substrate (10) and defines a first opening (140). A first electrode layer (3) is located between the substrate (10) and the pixel definition layer (1), and a portion of the first electrode layer (3) is exposed in the first opening (140); A light-emitting functional layer (4) is disposed on the side of the first electrode layer (3) away from the substrate (10) and is at least partially located in the first opening (140); A sub-pixel definition layer (130) is disposed on the side of the first electrode layer (3) exposed in the first opening (140) away from the substrate (10); the light-emitting functional layer (4) includes at least two sub-light-emitting functional units (41) spaced apart, with adjacent sub-light-emitting functional units (41) separated by the sub-pixel definition layer (130); A light extraction layer (5) is disposed on the side of the light-emitting functional layer (4) away from the substrate (10). The light extraction layer (5) is disposed corresponding to the light-emitting functional layer (4) and is used to extract the large-angle light from the light-emitting functional layer (4) in the forward direction. The display panel also includes an encapsulation layer (2), which is disposed on the side of the pixel definition layer (1) away from the substrate (10) and located between the pixel definition layer (1) and the light extraction layer (5); The encapsulation layer (2) includes a first inorganic encapsulation layer (21), an organic encapsulation layer (22), and a second inorganic encapsulation layer (23) stacked sequentially. The first inorganic encapsulation layer (21) is closer to the pixel definition layer (1) than the second inorganic encapsulation layer (23). The display panel also includes a reflective structure (8), which is disposed on the side of the first inorganic encapsulation layer (21) away from the substrate (10), and the organic encapsulation layer (22) covers the reflective structure (8). The orthographic projection of the reflective structure (8) on the substrate (10) is offset from the orthographic projection of the light-emitting functional layer (4) on the substrate (10). Alternatively, the reflective structure (8) is disposed on the side of the second inorganic encapsulation layer (23) away from the substrate (10), and the planarization layer (6) covers the reflective structure (8), and the orthographic projection of the reflective structure (8) on the substrate (10) is offset from the orthographic projection of the light-emitting functional layer (4) on the substrate (10). The reflective structure (8) is arranged around the light extraction layer (5).

2. The display panel according to claim 1, characterized in that, The orthographic projection of the light-emitting functional layer (4) on the substrate (10) is located within the orthographic projection of the light extraction layer (5) on the substrate (10).

3. The display panel according to claim 2, characterized in that, The light extraction layer (5) is configured as a convex lens that protrudes in a direction away from the substrate (10).

4. The display panel according to claim 2, characterized in that, The light extraction layer (5) includes a light extraction unit (51), which is configured correspondingly to the sub-light emission functional unit (41).

5. The display panel according to claim 4, characterized in that, The light extraction unit (51) and the sub-light emission function unit (41) are configured in a one-to-one correspondence.

6. The display panel according to claim 4, characterized in that, The orthographic projection of the sub-light-emitting functional unit (41) on the substrate (10) is located within the orthographic projection of the light extraction unit (51) on the substrate (10).

7. The display panel according to claim 1, characterized in that, The display panel also includes a refractive layer (7), which is disposed between the first inorganic encapsulation layer (21) and the organic encapsulation layer (22), and the refractive index of the refractive layer (7) is greater than the refractive index of the organic encapsulation layer (22).

8. The display panel according to claim 7, characterized in that, The material of the refractive layer (7) includes organic materials.

9. The display panel according to claim 1, characterized in that, The pixel definition layer (1) includes a first pixel definition layer (100) and a second pixel definition layer (110). The first pixel definition layer (100) includes an end face facing the light-emitting functional layer (4), and a first reflective layer (120) is disposed on the end face. The second pixel definition layer (110) is disposed between the light-emitting functional layer (4) and the first reflective layer (120) and completely covers the first reflective layer (120) and covers at least part of the side surface of the first pixel definition layer (100) away from the substrate (10). The second pixel definition layer (110) includes an insulating material.

10. The display panel according to claim 9, characterized in that, The reflectivity of the first reflective layer (120) is greater than or equal to 70%.

11. The display panel according to claim 9, characterized in that, The end face of the first pixel definition layer (100) is a slope, the angle between the plane of the slope and the substrate (10) is between 50° and 75°, and the height of the slope is between 3um and 5um.

12. The display panel according to claim 9, characterized in that, The sub-pixel definition layer (130) includes a third pixel definition layer (131) and a fourth pixel definition layer (132). The third pixel definition layer (131) is disposed on the first electrode layer (3) and located between two adjacent sub-light-emitting functional units (41). The third pixel definition layer (131) is higher than the sub-light-emitting functional unit (41). The fourth pixel definition layer (132) covers the third pixel definition layer (131). The fourth pixel definition layer (132) includes an insulating material.

13. The display panel according to claim 12, characterized in that, The third pixel definition layer (131) is made of the same material as the first pixel definition layer (100); the fourth pixel definition layer (132) is made of the same material as the second pixel definition layer (110).

14. The display panel according to claim 1, characterized in that, The display panel also includes a second electrode layer (9), which is partially located on the side of the light-emitting functional layer (4) away from the substrate (10) and partially located between the encapsulation layer (2) and the pixel definition layer (1).

15. The display panel according to claim 14, characterized in that, The first electrode layer (3) is the anode, and the second electrode layer (9) is the cathode.

16. The display panel according to claim 1, characterized in that, The display panel also includes a planarization layer (6), which is disposed on the side of the encapsulation layer (2) away from the substrate (10) and covers the encapsulation layer (2) and the light extraction layer (5).

17. The display panel according to claim 16, characterized in that, The refractive index of the planarization layer (6) is less than that of the light extraction layer (5).

18. The display panel according to claim 1, characterized in that, The reflective structure (8) includes a light-shielding layer (81) disposed on the second inorganic encapsulation layer (23) and a second reflective layer (82) covering the surface of the light-shielding layer (81).

19. A display device, characterized in that, The display panel includes any one of claims 1 to 18.

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