Display panel and display device

Abstract

The invention provides a display panel and a display device, and relates to the technical field of display. The display panel comprises a driving back plate, a first reflecting wall and a light-emitting device, wherein the driving back plate comprises a first electrode; the light-emitting device is electrically connected with the first electrode; the first end of the first reflection wall is connected with the first electrode, the second end of the first reflection wall extends in the direction away from the driving backboard, the first reflection wall is arranged close to the light emitting device, and the second end of the first reflection wall extends in the direction away from the driving backboard. The shortest distance between the first reflecting wall and the light-emitting device is gradually increased. The shortest distance between the first reflecting wall and the light-emitting device is gradually increased in the direction far away from the driving back plate, so that the first reflecting wall reflects the received large-viewing-angle light rays towards the light-emitting device, the effect of converging the light rays is achieved, and the front-view brightness of the display panel is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) display panels have been increasingly widely used due to their advantages such as light weight, low energy consumption, high brightness, bendability, and ability to display pure black. For example, OLED display panels are used in display devices such as mobile phones and car central control consoles.

[0003] Some display devices have an anti-peeping function. However, existing display devices with an anti-peeping function have low brightness when viewed straight on, which affects the user experience. Summary of the invention

[0004] Embodiments of the present disclosure provide a display panel and a display device, which realize an anti-peeping function while taking into account normal viewing brightness.

[0005] To achieve the above objectives, the embodiments of the present disclosure adopt the following technical solutions:

[0006] On the one hand, a display panel is provided, which includes a driving backplane, a first reflecting wall and a light-emitting device, wherein the driving backplane includes a first electrode; the light-emitting device is electrically connected to the first electrode; a first end of the first reflecting wall is connected to the first electrode, a second end of the first reflecting wall extends in a direction away from the driving backplane, the first reflecting wall is arranged adjacent to the light-emitting device, and the shortest distance between the first reflecting wall and the light-emitting device gradually increases in the direction away from the driving backplane.

[0007] In some embodiments, an angle between the first reflective wall and the driving back plate is greater than or equal to 40° and less than or equal to 70°.

[0008] In some embodiments, a distance between the first end of the first reflective wall and the light emitting device is greater than or equal to 0.8 μm and less than or equal to 2.5 μm.

[0009] In some embodiments, the shortest distance between the second end of the first reflective wall and the first electrode is greater than or equal to 1.5 μm and less than or equal to 3 μm.

[0010] In some embodiments, the display panel further includes a second reflective wall, wherein the second reflective wall is connected to the second end of the first reflective wall, and the second reflective wall extends in a direction away from the opening area.

[0011] In some embodiments, the display panel further includes a pixel definition layer, the pixel definition layer is located between two adjacent light-emitting devices, and the first reflective wall is embedded in the pixel definition layer.

[0012] In some embodiments, the pixel definition layer includes a first sublayer and a second sublayer, the first sublayer is located on a side of the first reflective wall facing the light-emitting device, the second sublayer is located on a side of the first reflective wall away from the light-emitting device, and the extinction coefficient of the first sublayer is less than or equal to 0.001.

[0013] In some embodiments, along a direction away from the driving backplane, the light emitting device includes a first sub-device and a second sub-device in sequence, the first sub-device and the second sub-device are stacked, and the first sub-device and the second sub-device have different thicknesses.

[0014] In some embodiments, a thickness of the second sub-device is greater than a thickness of the first sub-device.

[0015] In some embodiments, a thickness of the second sub-device is greater than or equal to 1.5 times a thickness of the first sub-device and less than or equal to 2 times a thickness of the first sub-device.

[0016] In some embodiments, the display panel also includes a black matrix layer, which is arranged on a side of the light-emitting device away from the driving backplane, and the black matrix layer is provided with a light-transmitting hole opposite to the light-emitting device, and the opening of the light-transmitting hole gradually increases in a direction away from the light-emitting device.

[0017] In some embodiments, the black matrix layer includes a plurality of sub-layers stacked together, each of the sub-layers is provided with a sub-light-transmitting hole, and the plurality of sub-light-transmitting holes are relatively arranged to form the light-transmitting hole, and among two adjacent sub-light-transmitting holes, the opening of the sub-light-transmitting hole farther away from the light-emitting device is larger.

[0018] On the other hand, a display device is provided, and the display device includes the display panel.

[0019] The display panel and display device provided by the embodiment of the present disclosure include a driving backplane, a first reflecting wall and a light emitting device, wherein the driving backplane includes a first electrode; the light emitting device is electrically connected to the first electrode; the first end of the first reflecting wall is connected to the first electrode, the second end of the first reflecting wall extends in a direction away from the driving backplane, the first reflecting wall is arranged adjacent to the light emitting device, and the shortest distance between the first reflecting wall and the light emitting device gradually increases in the direction away from the driving backplane. When the light emitting device emits light of small viewing angle and light of large viewing angle, the light of small viewing angle is emitted in a direction substantially perpendicular to the light emitting surface. Since the first reflecting wall is arranged adjacent to the light emitting device, the light of large viewing angle emitted toward the first reflecting wall is reflected by the first reflecting wall, thereby reducing the light of large viewing angle emitted by the display panel and narrowing the viewing angle of the display panel. Moreover, since the shortest distance between the first reflecting wall and the light emitting device gradually increases in the direction away from the driving backplane, the first reflecting wall reflects the received light of large viewing angle toward the light emitting device, plays the role of converging light, thereby improving the front view brightness of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A front view structure of a display device provided by an embodiment of the present disclosure;

[0022] Figure 2 A partial structural cross-sectional view of a display panel provided by an embodiment of the present disclosure;

[0023] Figure 3 A partial structural cross-sectional view of a display panel provided in an embodiment of the present disclosure;

[0024] Figure 4 A partial structural cross-sectional view of a display panel provided in an embodiment of the present disclosure;

[0025] Figure 5 A cross-sectional view of a light emitting device provided in an embodiment of the present disclosure;

[0026] Figure 6 A cross-sectional view of a light emitting device provided in an embodiment of the present disclosure;

[0027] Figure 7 is the intrinsic spectrum of the light-emitting layer material;

[0028] Figure 8 is a top view of a black matrix layer in an embodiment of the present disclosure;

[0029] Fig. 9 About Figure 8 Sectional view at AA in the middle;

[0030] Fig.10 is a top view of another black matrix layer in an embodiment of the present disclosure;

[0031] Fig.11 is a top view of another black matrix layer in an embodiment of the present disclosure;

[0032] Fig.12 A partial structural top view of a display panel;

[0033] Fig.13 A partial top view of another display panel structure.

[0034] Reference numerals:

[0035] 1000-display device;

[0036] 100-display panel;

[0037] 110 - driving backplane; 101 - substrate; 102 - buffer layer; 103 - semiconductor layer; 104 - gate insulating layer; 105 - gate layer; 106 - first insulating layer; 107 - source and drain electrode layer; 108 - pixel flat layer;

[0038] 120-light emitting device; 120a-first sub-device; 120b-second sub-device;

[0039] 121-hole transport layer; 122-auxiliary light-emitting layer; 123-light-emitting layer; 124-hole blocking layer; 125-electron transport layer; 126-tandem hole transport layer; 127-tandem auxiliary light-emitting layer; 128-tandem light-emitting layer; 129-tandem hole blocking layer; 1210-tandem electron transport layer; 1211-second electrode; 1212-high refractive index microcavity adjustment layer; 1213-low refractive index microcavity adjustment layer;

[0040] 131 - first reflection wall; 132 - second reflection wall;

[0041] 140 - black matrix layer; 141 - light transmission hole; 141a - sub-light transmission hole; 142 - sub-layer;

[0042] 151-pixel definition layer; 151a-first sublayer; 151b-second sublayer;

[0043] 152 - first inorganic encapsulation layer; 153 - organic encapsulation layer; 154 - second inorganic encapsulation layer; 155 - touch layer; 156 - adhesive layer; 157 - cover plate. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0045] In the embodiments of the present disclosure, words such as "first", "second", "third", and "fourth" are used to distinguish between identical or similar items with substantially the same functions and effects. This is only for the purpose of clearly describing the technical solutions of the embodiments of the present disclosure and shall not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0046] In the embodiments of the present disclosure, “plurality” means two or more than two, and “at least one” means one or more than one, unless otherwise clearly and specifically defined.

[0047] In the embodiments of the present disclosure, the orientation or positional relationship indicated by the terms "upper" and "lower" etc. is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0048] Figure 1 A front view structure of a display device provided by an embodiment of the present disclosure. Figure 1 As shown, some embodiments of the present disclosure provide a display device 1000, which can be any device with a display function. For example, the display device 1000 can be a mobile phone, a wireless device, a personal data assistant (PDA), a handheld or portable computer, a GPS receiver / navigator, a camera, an MP4 video player, a video camera, a game console, a watch, a clock, a calculator, a TV monitor, a flat-panel display, a computer monitor, a car display (e.g., an odometer display, etc.), a navigator, a cockpit controller and / or display, a display of a camera view (e.g., a display of a rear-view camera in a vehicle), an electronic photo, an electronic billboard or sign, a projector, a building structure, a packaging and an aesthetic structure (e.g., a display of an image of a piece of jewelry), etc. Figure 1 In the figure, the display device 1000 is taken as a mobile phone as an example.

[0049] Continue to refer Figure 1 The display device 1000 includes a display panel 100, and an image is displayed through the display panel 100. The display panel 100 may be an electroluminescent display panel or a photoluminescent display panel. When the display panel 100 is an electroluminescent display panel, the display panel 100 may be an organic light-emitting diode (OLED) display panel or a quantum dot light-emitting diode (QLED) display panel. When the display panel 100 is a photoluminescent display panel, the display panel 100 may be a quantum dot photoluminescent display panel. The following description is made by taking the display panel 100 as an OLED display panel as an example.

[0050] Figure 2 This is a partial structural cross-sectional view of a display panel provided by an embodiment of the present disclosure. Figure 2 As shown, the display panel 100 includes a driving backplane 110 and a light emitting device 120. The driving backplane 110 is provided with a pixel driving circuit, and the pixel driving circuit is electrically connected to the light emitting device 120 so that the light emitting device 120 emits light under the drive of the pixel driving circuit.

[0051] Continue to refer Figure 2 The driving backplane 110 may include a substrate 101 and a plurality of film layers stacked on the substrate 101, wherein the plurality of film layers may include a patterned semiconductor film layer and a patterned conductive film layer, and the patterned semiconductor film layer and the patterned conductive film layer together form a pixel driving circuit. The embodiments of the present disclosure do not limit the specific film layer composition of the driving backplane 110 and the specific circuit structure of the pixel driving circuit.

[0052] For example, continue to refer to Figure 2 The driving backplane 110 includes a substrate 101 and a buffer layer 102, a semiconductor layer 103, a gate insulating layer 104, a gate layer 105, a first insulating layer 106, a source and drain electrode layer 107, a pixel planarization layer 108, etc. which are sequentially stacked on the substrate 101.

[0053] Among them, the substrate 101 is used to support and connect other film layer structures of the driving backplane 110. The substrate 101 can be a rigid substrate or a flexible substrate, and can be flexibly selected according to needs in practical applications. Exemplarily, the substrate 101 is a rigid substrate. For example, the substrate 101 can be a glass substrate or a polymethyl methacrylate (PMMA) substrate, etc. Exemplarily, the substrate 101 is a flexible substrate. For example, the substrate 101 can be a polyethylene terephthalate (PET) substrate, a polyethylene naphthalate diformic acid glycol ester (PEN) substrate or a polyimide (PI) substrate, etc. The substrate 101 can be a single-layer structure or a composite structure formed by stacking multiple layers. When the substrate 101 is a composite structure, the multilayer structure layer in the substrate 101 can be any one or more of the above-mentioned rigid substrate and flexible substrate.

[0054] When the substrate 101 is a rigid substrate, the thickness of the substrate 101 may be 0.5 mm to 2 mm; when the substrate 101 is a flexible substrate, the thickness of the substrate 101 may be 1 μm to 100 μm. The buffer layer 102 may have a thickness of 1 μm to 10 μm.

[0055] The semiconductor layer 103 includes a channel of the transistor. The material of the semiconductor layer 103 can be single crystal silicon (A-Si), polycrystalline silicon (P-Si), or a mixture of single crystal silicon and polycrystalline silicon. The thickness of the semiconductor layer 103 can be 100 nm to 1 μm.

[0056] The gate insulating layer 104 may be made of silicon nitride, silicon oxide or silicon oxynitride, and may have a thickness of 100 nm to 1 um.

[0057] The gate layer 105 includes a gate of the transistor and may have a thickness of 100 nm to 1 μm.

[0058] The material of the first insulating layer 106 may be silicon nitride, silicon oxide or silicon oxynitride. The thickness of the first insulating layer 106 may be 100 nm to 1 um.

[0059] The source-drain electrode layer 107 is electrically connected to the channel through vias to form the source and drain of the transistor.

[0060] The pixel planarization layer 108 may be made of an organic optical adhesive and may have a thickness of 1 μm to 3 μm.

[0061] A first electrode is disposed on one side of the driving backplane 110 away from the substrate 101, and the first electrode is electrically connected to the source-drain electrode layer 107 through a via hole. The light emitting device 120 is disposed on the first electrode and electrically connected to the first electrode. Exemplarily, the first electrode is an anode.

[0062] The light emitting device 120 may be a single light emitting device or a tandem device, which is not limited in the embodiments of the present disclosure. The light emitting device 120 may be a red light emitting device, a green light emitting device, a blue light emitting device, a white light emitting device, etc.

[0063] When the display panel 100 is working, the light emitting device 120 emits light under the current drive provided by the pixel driving circuit, and can emit light with a small viewing angle or a large viewing angle. Light with a small viewing angle refers to light with a small angle with the normal of the light emitting surface, and light with a large viewing angle refers to light with a large angle with the normal of the light emitting surface. For example, light with an angle of 0 with the normal of the light emitting surface (front-view light) is light with a small viewing angle, and light with an angle of 57° with the normal of the light emitting surface is light with a large viewing angle.

[0064] When the user is facing or nearly facing the display panel 100, the user's eyes can see the image displayed by the display panel 100 by receiving light of a small viewing angle. When the user is not facing the display panel 100, the user's eyes can see the image displayed by the display panel 100 by receiving light of a large viewing angle. Some usage scenarios of the display panel 100 require narrowing the visible viewing angle of the display panel 100. For example, when the display panel 100 has an anti-peeping function, the visible viewing angle of the display panel 100 needs to be narrowed. For another example, when the display panel 100 is applied to a car, in order to prevent the display panel 100 from affecting the driver's line of sight, the visible viewing angle of the display panel 100 needs to be narrowed. In order to narrow the visible viewing angle of the display panel 100, it is necessary to reduce the large viewing angle light emitted by the display panel 100. When the user is not facing the display panel 100, the image displayed by the display panel 100 cannot be normally viewed because the user cannot receive the large viewing angle light or receives less large viewing angle light.

[0065] In order to reduce the wide-angle light emitted by the display panel 100, the method commonly used in the related art is to attach an anti-peep film to the surface of the display panel to filter the wide-angle light through the anti-peep film. For example, the display panel in the related art also includes an anti-peep film, which is arranged on the side of the light-emitting device away from the driving backplane to absorb the wide-angle light. However, the anti-peep film not only absorbs the wide-angle light, but also absorbs a part of the small-angle light, resulting in a decrease in the front-view brightness of the display panel. For example, the transmittance of some anti-peep films is 65%, that is, only 65% ​​of the small-angle light passes through the anti-peep film, which reduces the front-view brightness of the display panel.

[0066] In view of this, the embodiment of the present disclosure provides a new display panel 100 , which narrows the viewing angle of the display panel 100 without increasing the thickness of the display panel 100 .

[0067] Continue to refer Figure 2 The display panel 100 also includes a first reflective wall 131, a first end of the first reflective wall 131 is connected to the first electrode, a second end of the first reflective wall 131 extends in a direction away from the driving backplane 110, the first reflective wall 131 is arranged adjacent to the light emitting device 120, and along the direction away from the driving backplane 110, the shortest distance between the first reflective wall 131 and the light emitting device 120 gradually increases.

[0068] The first reflective wall 131 has a high reflectivity, and light incident on the first reflective wall 131 can be reflected by the first reflective wall 131. For example, the first reflective wall 131 is made of a metal material with a high reflectivity, and of course the first reflective wall 131 can also be made of other materials, and the embodiment of the present disclosure does not limit the material of the first reflective wall 131.

[0069] When the light emitting device 120 emits light of small viewing angle and light of large viewing angle, it emits light of small viewing angle at the same time. Light of small viewing angle is emitted in a direction substantially perpendicular to the light emitting surface. Since the first reflecting wall 131 is arranged adjacent to the light emitting device 120, the light of large viewing angle emitted toward the first reflecting wall 131 is reflected by the first reflecting wall 131, thereby reducing the light of large viewing angle emitted by the display panel 100 and narrowing the viewing angle of the display panel 100. In addition, since the shortest distance between the first reflecting wall 131 and the light emitting device 120 gradually increases in the direction away from the driving backplane 110, the first reflecting wall 131 reflects the received light of large viewing angle toward the light emitting device 120, plays the role of converging light, and thus improves the front view brightness of the display panel 100.

[0070] Continue to refer Figure 1 , along the first direction X shown in the figure, the light emitting device 120 has a first side and a second side opposite to each other, and along the second direction Y shown in the figure, the light emitting device 120 has a third side and a fourth side opposite to each other. The first reflective wall 131 may be located at the first side of the light emitting device 120, or at the second side of the light emitting device 120, or at the first side and the second side of the light emitting device 120 at the same time. When the first reflective wall 131 is located at the first side of the light emitting device 120, the viewing angle of the first side may be narrowed, when the first reflective wall 131 is located at the second side of the light emitting device 120, the viewing angle of the second side may be narrowed, and when the first reflective wall 131 is located at the first side and the second side of the light emitting device 120 at the same time, the viewing angles of the first side and the second side may be narrowed at the same time. Similarly, the first reflective wall 131 may also be arranged at the third side and / or the fourth side of the light emitting device 120.

[0071] When the first reflective wall 131 is simultaneously disposed on the first side, the second side, the third side and the fourth side of the light emitting device 120, the first reflective walls 131 respectively disposed on the first side, the second side, the third side and the fourth side of the light emitting device 120 are sequentially connected, so that the first reflective walls 131 enclose an opening area, and the opening of the opening area gradually increases in the direction away from the driving back plate 110, and the light emitting device 120 is disposed in the opening area. That is, the shape and function of the first reflective wall 131 are similar to the reflector of a flashlight, which plays the role of converging light on the one hand and improving brightness on the other.

[0072] Exemplarily, the first reflective wall 131 and the first electrode are an integrated structure, that is, the first reflective wall 131 and the first electrode are manufactured in the same patterning process.

[0073] Of course, the first reflective wall 131 and the first electrode can also be prepared by different patterning processes.

[0074] Figure 3 A partial structural cross-sectional view of a display panel provided in an embodiment of the present disclosure. Figure 3 As shown, the angle between the first reflective wall 131 and the driving backplane 110 is α. The angle between the first reflective wall 131 and the driving backplane 110 refers to the angle between the plane where the first reflective wall 131 is located and the plane where the driving backplane 110 is located. The plane where the driving backplane 110 is located is parallel to the light emitting surface of the display panel 100.

[0075] In some embodiments, 40°≤α≤70°. For example, α is any value of 40°, 45°, 50°, 55°, 60°, 65°, 70°, or a value in a range consisting of any two values. In this way, the viewing angle of the display panel 100 can be reduced while taking into account the brightness of the display panel 100.

[0076] In practical applications, the angle between the first reflective wall 131 and the driving back plate 110 can be flexibly adjusted according to the viewing angle and the need for front-view brightness.

[0077] When the first reflective wall 131 is simultaneously located at multiple positions on the first side, the second side, the third side, and the fourth side of the light emitting device 120, the angles α between the first reflective wall 131 at different positions and the driving backplane 110 may be the same or different. For example, the angle between the first reflective wall 131 located at the first side of the light emitting device 120 and the driving backplane 110 is 40°, and the angle between the first reflective wall 131 located at the third side of the light emitting device 120 and the driving backplane 110 is 50°. For another example, the angle between the first reflective wall 131 located at the first side of the light emitting device 120 and the driving backplane 110 is 40°, and the angle between the first reflective wall 131 located at the third side of the light emitting device 120 and the driving backplane 110 is 40°.

[0078] Continue to refer Figure 2 , the first end of the first reflective wall 131 and the light emitting device 120 may be spaced apart, for example, the distance between the first end of the first reflective wall 131 and the light emitting device 120 is d. The first end of the first reflective wall 131 refers to the end of the first reflective wall 131 closer to the driving backplane 110; the second end of the first reflective wall 131 refers to the end of the first reflective wall 131 farther from the driving backplane 110. The distance between the first end of the first reflective wall 131 and the light emitting device 120 may be, for example, along Figure 2 The first direction X is shown as the distance between the first end of the first reflective wall 131 and the light emitting device 120 .

[0079] In some embodiments, d is greater than or equal to 0.8 μm and less than or equal to 2.5 μm. For example, the distance d between the first end of the first reflective wall 131 and the light emitting device 120 can be any value among 0.8 μm, 1 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm, 2.2 μm, 2.5 μm, or a value in a range consisting of any two values. In this way, the viewing angle of the display panel 100 can be reduced while taking into account the brightness of the display panel 100.

[0080] In practical applications, the distance between the first reflective wall 131 and the light emitting device 120 can be flexibly adjusted according to the viewing angle and the need for front-view brightness.

[0081] When the first reflective wall 131 is simultaneously located at multiple positions on the first side, the second side, the third side, and the fourth side of the light emitting device 120, the distances between the first reflective wall 131 at different positions and the light emitting device 120 may be the same or different. For example, the distance between the first reflective wall 131 located at the first side of the light emitting device 120 and the light emitting device 120 is 2 μm, and the distance between the first reflective wall 131 located at the third side of the light emitting device 120 and the light emitting device 120 is 2.5 μm. For another example, the distance between the first reflective wall 131 located at the first side of the light emitting device 120 and the light emitting device 120 is 2 μm, and the distance between the first reflective wall 131 located at the third side of the light emitting device 120 and the light emitting device 120 is 2 μm.

[0082] Continue to refer Figure 2 The shortest distance between the second end of the first reflective wall 131 and the first electrode is h. For example, h is equal to the distance between the second end of the first reflective wall 131 and the first electrode along the third direction Z shown in the figure.

[0083] In some embodiments, h is greater than or equal to 1.5 μm and less than or equal to 3 μm. For example, the shortest distance h between the second end of the first reflective wall 131 and the first electrode is 1.5 μm, 1.6 μm, 1.8 μm, 2 μm, 2.2 μm, 2.5 μm, 2.8 μm, or 3 μm.

[0084] In practical applications, the distance between the second end of the first reflective wall 131 and the first electrode can be flexibly adjusted according to the viewing angle and the need for front-view brightness.

[0085] When the first reflective wall 131 is simultaneously located at multiple positions on the first side, the second side, the third side, and the fourth side of the light emitting device 120, the distances between the second end of the first reflective wall 131 at different positions and the first electrode may be the same or different. For example, the distance between the second end of the first reflective wall 131 located on the first side of the light emitting device 120 and the first electrode is 2 μm, and the distance between the second end of the first reflective wall 131 located on the third side of the light emitting device 120 and the first electrode is 2.5 μm. For another example, the distance between the second end of the first reflective wall 131 located on the first side of the light emitting device 120 and the first electrode is 2 μm, and the distance between the second end of the first reflective wall 131 located on the third side of the light emitting device 120 and the first electrode is 2 μm.

[0086] Figure 4 A partial structural cross-sectional view of a display panel provided in an embodiment of the present disclosure. Figure 4 As shown, in some embodiments, the display panel 100 further includes a second reflective wall 132 , the second reflective wall 132 is connected to the second end of the first reflective wall 131 , and the second reflective wall 132 extends in a direction away from the opening area.

[0087] The material of the second reflective wall 132 may be the same as that of the first reflective wall 131 . For example, the second reflective wall 132 and the first reflective wall 131 are formed in the same patterning process.

[0088] When the second reflective wall 132 and the first reflective wall 131 are formed in the same patterning process, the second reflective wall 132 can be provided to improve the accuracy of h. For example, the first reflective wall 131 can be prepared by a deposition process. Due to the limitation of the deposition process capability, the first reflective wall 131 may be insufficiently deposited, so that the distance between the second end of the first reflective wall 131 and the first electrode may be less than the theoretical value. Since the second reflective wall 132 is connected to the second end of the first reflective wall 131, the connection between the first reflective wall 131 and the second reflective wall 132 can be fully deposited during the deposition process, thereby improving the dimensional accuracy of the distance h between the second end of the first reflective wall 131 and the first electrode.

[0089] Exemplarily, the second reflective wall 132 extends in a direction parallel to the driving back plate 110 .

[0090] Furthermore, the second reflective wall 132 can reflect the external light incident on the second reflective wall 132 from the light emitting surface of the display panel 100 , thereby reducing the interference of the external light on the image of the display panel 100 .

[0091] The embodiment of the present disclosure does not limit the extension dimension of the second reflective wall 132 along the first direction X shown in the figure, and it can be flexibly adjusted as needed in actual application.

[0092] Continue to refer Figures 2 to 4 In some embodiments, the display panel 100 further includes a pixel definition layer, and the pixel definition layer is located between two adjacent light emitting devices 120. Exemplarily, the pixel definition layer is provided with a plurality of opening regions, and the light emitting devices 120 are arranged in the opening regions, and different light emitting devices 120 can be arranged in different opening regions. Exemplarily, the material of the pixel definition layer can be optical glue, and the thickness of the pixel definition layer is 5 μm to 13 μm.

[0093] The first reflective wall 131 is embedded in the pixel definition layer, making full use of the space of the pixel definition layer. After the first reflective wall 131 is set, the display panel 100 does not increase the distance between two adjacent light emitting devices 120, thereby improving the pixel density of the display panel 100.

[0094] In practical applications, the second reflective wall 132 may also be embedded in the pixel definition layer.

[0095] In some embodiments, the pixel definition layer includes a first sublayer 151a and a second sublayer 151b, the first sublayer 151a is located on a side of the first reflective wall 131 facing the light emitting device 120, and the second sublayer 151b is located on a side of the first reflective wall 131 away from the light emitting device 120.

[0096] When the display panel 100 is prepared, the second sub-layer 151 b may be prepared first, and then the first reflective wall 131 may be prepared on the second sub-layer 151 b , and then the first sub-layer 151 a may be prepared on the first reflective wall 131 .

[0097] The materials of the first sub-layer 151 a and the second sub-layer 151 b may be the same or different.

[0098] In some embodiments, the extinction coefficient of the first sublayer 151a is less than or equal to 0.001, which can reduce the absorption of the light emitted by the light emitting device 120 by the first sublayer 151a, so that the wide-angle light emitted by the light emitting device 120 can be irradiated to the first reflective wall 131 as much as possible, and then reflected by the first reflective wall 131.

[0099] The extinction coefficient of the second sublayer 151b may be less than or equal to 0.001, or greater than 0.001. For example, the extinction coefficient of the second sublayer 151b is relatively large, so that the second sublayer 151b can absorb the ambient light irradiated into the display panel 100, thereby reducing the interference of the ambient light on the display panel 100.

[0100] Figure 5 1 is a cross-sectional view of a light emitting device 120 provided in an embodiment of the present disclosure. Figure 5 As shown, when the light-emitting device 120 is a single device, along the direction away from the driving backplane 110, the light-emitting device 120 includes a hole transport layer 121 (HTL), an auxiliary light-emitting layer 122 (Prime), a light-emitting layer 123 (EML), a hole blocking layer 124 (HBL) and an electron transport layer 125 (ETL) in sequence. The thickness of the hole transport layer 121 is between 120nm and 150nm, the thickness of the auxiliary light-emitting layer 122 is between 5nm and 100nm, the thickness of the light-emitting layer 123 is between 20nm and 60nm, the thickness of the hole blocking layer 124 is between 5nm and 10nm, and the thickness of the electron transport layer 125 is between 20nm and 50nm.

[0101] Among them, the side of the light emitting device 120 away from the driving backplane 110 is also provided with a second electrode 1211, a high refractive index microcavity adjustment layer 1212 (CPL1), and a low refractive index microcavity adjustment layer 1213 (CPL2) in sequence. The thickness of the second electrode 1211 is between 8nm and 15nm, the thickness of the high refractive index microcavity adjustment layer 1212 is between 50nm and 100nm, and the thickness of the low refractive index microcavity adjustment layer 1213 is between 50nm and 100nm.

[0102] Figure 6 A cross-sectional view of a light emitting device provided in an embodiment of the present disclosure. Figure 6 As shown, in some embodiments, when the light-emitting device 120 is a tandem device, along the direction away from the driving backplane 110, the light-emitting device 120 includes a first sub-device 120a and a second sub-device 120b in sequence, the first sub-device 120a and the second sub-device 120b are stacked, and the thickness of the first sub-device 120a and the second sub-device 120b are different.

[0103] The Tandem device has an additional light-emitting layer compared to the Single device, so that the light-emitting device 120 is thicker. When the light-emitting device 120 is thicker, the color gamut and efficiency of the light-emitting device 120 are higher, and the brightness decays faster with the viewing angle, thereby narrowing the viewing angle.

[0104] In some embodiments, the thickness of the second sub-device 120b is greater than that of the first sub-device 120a. While taking into account the luminous efficiency of the light-emitting device 120, the viewing angle of the display panel 100 is narrowed. Exemplarily, the thickness of the second sub-device 120b is between 1.5 times and 2 times the thickness of the first sub-device 120a. For example, the thickness of the second sub-device 120b is 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, etc. the thickness of the first sub-device 120a.

[0105] Exemplarily, continuing to refer to Figure 6 , the first sub-device 120a sequentially includes a hole transport layer 121 (HTL), an auxiliary light-emitting layer 122 (Prime), a light-emitting layer 123 (EML), a hole blocking layer 124 (HBL), and an electron transport layer 125 (ETL). The second sub-device 120b sequentially includes a tandem hole transport layer 126, a tandem auxiliary light-emitting layer 127 (Prime), a tandem light-emitting layer 128 (EML), a tandem hole blocking layer 129 (HBL), and a tandem electron transport layer 1210 (ETL). The thickness of the tandem hole transport layer 126 is between 40 nm and 60 nm, the thickness of the tandem auxiliary light-emitting layer 127 is between 5 nm and 50 nm, the thickness of the tandem light-emitting layer 128 is between 50 nm and 120 nm, and the thickness is between 1.5 times and 2.5 times the thickness of the light-emitting layer 123 in the first sub-device 120a. The thickness of the tandem hole blocking layer 129 is between 5 nm and 10 nm, and the thickness of the tandem electron transport layer 1210 is between 20 nm and 50 nm.

[0106] Among them, a low-refractive-index hole transport layer in the tandem device can be inserted under the hole transport layer 121 (HTL) or between the hole transport layer 121 (HTL) and the auxiliary light-emitting layer 122 (Prime), or between the electron transport layer 125 (ETL) and the tandem hole transport layer 126, or between the tandem hole transport layer 126 and the tandem auxiliary light-emitting layer 127. The refractive indices of the hole transport layer 121 and the tandem hole transport layer 126 at a wavelength of 200 nm to 800 nm are between 1.85 and 1.95. The refractive index of the low-refractive-index hole transport layer at a wavelength of 200 nm to 800 nm is between 1.45 and 1.75. And as the refractive index decreases, the thickness increases. The thickness of the inserted low-refractive-index hole transport layer satisfies: the thickness of the HTL < the thickness of the HTL + the thickness of the low-refractive-index hole transport layer 121 < 2 times the thickness of the HTL, and the overall efficiency of the light-emitting device 120 is increased by 5% to 12.5%.

[0107] Figure 7 Is the intrinsic spectrogram of the light-emitting layer material. Exemplarily, such as Figure 7 As shown, in the intrinsic spectrum of the light-emitting layer material, point A is the peak of the spectrum, L is the width of half the height of the spectrum (half-height width), and the shaded area ② occupies the entire spectrum area ① is called the shoulder peak ratio. In the disclosed embodiment, the intrinsic spectrum peak of the blue light-emitting layer material is between 460nm and 480nm, the half-height width is between 15nm and 25nm, and the shoulder peak ratio is between 20% and 40%; the intrinsic spectrum peak of the green light-emitting layer material is between 520nm and 550nm, the half-height width is between 30nm and 60nm, and the shoulder peak ratio is between 40% and 60%; the intrinsic spectrum peak of the red light-emitting layer material is between 620nm and 640nm, the half-height width is between 25nm and 50nm, and the shoulder peak ratio is between 30% and 50%.

[0108] Figure 8 is a top view of a black matrix layer in an embodiment of the present disclosure, Fig. 9 About Figure 8 Cross-section view at AA in the middle. Continue to refer to Figure 2 , Figure 8 as well as Fig. 9 In some embodiments, the display panel 100 further includes a black matrix layer 140 (BM), which is disposed on a side of the light emitting device 120 away from the driving backplane 110, and the black matrix layer 140 is provided with a light-transmitting hole 141 opposite to the light emitting device 120. Light emitted by the light emitting device 120 is emitted from the light-transmitting hole 141.

[0109] The size of the light-transmitting hole 141 along the first direction X shown in the figure may be larger than the size of the light-emitting device 120 along the first direction X. At this time, the distance between two adjacent light-emitting devices 120 is larger than the distance between two adjacent light-transmitting holes 141 .

[0110] For example, continue to refer to Figure 2 , along the direction away from the driving backplane 110, the display panel 100 further includes a first inorganic encapsulation layer 152, an organic encapsulation layer 153 and a second inorganic encapsulation layer 154 which are sequentially stacked, and the first inorganic encapsulation layer 152 is arranged on the side of the light-emitting device 120 away from the driving backplane 110. The black matrix layer 140 can be arranged on the side of the second inorganic encapsulation layer 154 away from the driving backplane 110. Among them, the material of the first inorganic encapsulation layer 152 (CVD1) is silicon nitride, silicon oxide or silicon oxynitride, and the thickness is between 500nm and 1um; the material of the organic encapsulation layer 153 (IJP) is organic optical glue, and the thickness is between 5um and 13um; the material of the second inorganic encapsulation layer 154 (CVD2) is silicon nitride, silicon oxide or silicon oxynitride, and the thickness is between 500nm and 1um.

[0111] Fig.10 FIG. 1 is a top view of another black matrix layer in the embodiment of the present disclosure. Fig.10 As shown, in some embodiments, the opening of the light-transmitting hole 141 gradually increases in a direction away from the light-emitting device 120. The gradual increase in the opening of the light-transmitting hole 141 can reduce the shielding of the light of the light-emitting device 120 by the black matrix layer 140, thereby improving the brightness of the display panel 100.

[0112] Fig.11 FIG. 1 is a top view of another black matrix layer in the embodiment of the present disclosure. Fig.11 As shown, in some embodiments, the black matrix layer 140 includes a plurality of stacked sub-layers 142, each sub-layer 142 is provided with a sub-light-transmitting hole 141a, and the plurality of sub-light-transmitting holes 141a are arranged relatively to form a light-transmitting hole 141, and among two adjacent sub-light-transmitting holes 141a, the opening of the sub-light-transmitting hole 141a that is farther away from the light-emitting device 120 is larger. The gradual increase in the opening of the light-transmitting hole 141 can reduce the shielding of the light of the light-emitting device 120 by the black matrix layer 140, thereby improving the brightness of the display panel 100.

[0113] Furthermore, when the black matrix layer 140 is composed of a plurality of sub-layers 142 , the thickness of the black matrix layer 140 may be increased, so that the black matrix layer 140 filters part of the light with a large viewing angle, thereby narrowing the viewing angle of the display panel 100 .

[0114] The embodiment of the present disclosure does not limit the number and specific thickness of the sub-layers 142 .

[0115] The beneficial effects of the display panel 100 provided by the embodiment of the present disclosure are described below with reference to specific examples.

[0116] For example, continue to refer to Figure 2 The display panel further includes a touch layer 155, an adhesive layer 156 and a cover plate 157. The touch layer 155 is composed of metal wiring and inorganic materials, and has a thickness of 1um to 5um; the adhesive layer 156 is made of organic optical glue, and has a thickness of 1um to 5um; the cover plate layer 157 can be made of glass, sapphire or other organic high molecular polymer materials, and has a thickness of 100um to 2mm.

[0117] Example 1.

[0118] Fig.12 FIG. 1 is a partial structural top view of a display panel 100. Fig.12 Taking the light emitting device 120 in FIG. 1 as an example, the pixel length in the X direction is shorter than that in the Y direction, and the structure and size of the first reflective wall 131 located on the first side and the second side of the light emitting device 120 are the same as the structure and size of the first reflective wall 131 located on the third side and the fourth side of the light emitting device 120. Figure 2In the X direction, the length b of the reflector slope accounts for a larger proportion of the pixel width a, so the front convergence in the X direction is stronger and the brightness decays faster with the viewing angle; in the Y direction, the proportion of b to a is smaller, and the brightness decays more slowly with the viewing angle than in the X direction. It can be used in the field of automotive display when there are differentiated requirements for L-Decay in the X and Y directions.

[0119] When b / a≤10%, the front brightness increases by 3%~6%, the 45°L-Decay decreases by 2%~4%, and the 60°L-Decay decreases by 2%~4%; when 10%≤b / a≤20%, the front brightness increases by 6%~9%, the 45°L-Decay decreases by 3%~5%, and the 60°L-Decay decreases by 3%~5%; when 20%≤b / a≤30%, the front brightness increases by 9%~12%, the 45°L-Dec ay decreases by 4% to 7%, and 60°L-Decay decreases by 4% to 7%; when 30%≤b / a≤40%, the front brightness increases by 12% to 15%, 45°L-Decay decreases by 5% to 8%, and 60°L-Decay decreases by 5% to 8%; when 40%≤b / a≤50%, the front brightness increases by 15% to 20%, 45°L-Decay decreases by 6% to 9%, and 60°L-Decay decreases by 6% to 9%.

[0120] In the example, the viewing angle light emission characteristics in the X direction and the Y direction can be controlled by designing the aspect ratio of the pixel. When the aspect ratio approaches 1, the same L-Decay can be obtained in the X direction and the Y direction. Fig.13 FIG. 1 is a partial top view of another display panel 100. Fig.13 As shown, the aspect ratio of the pixel approaches 1.

[0121] Example 2

[0122] Continue to refer Figure 2 , α is between 40° and 50°, d is between 0.8um and 1um, h is between 2.4um and 2.6um, the outer slope angle of the pixel definition layer is greater than or equal to the included angle α between the first reflective wall 131 and the driving backplane 110, and the outer plane height of the pixel definition layer is between 0.5um and 1.5um higher than the second end height of the first reflective wall 131. Figure 8 and Fig. 9 The black matrix layers 140L1 and L2 are 1um to 3um wider than the light emitting devices 120, and D1 and D2 are 1um to 3um narrower than the widths between adjacent light emitting devices 120. The front brightness at 0° viewing angle increases by 4% to 8%, the brightness at 45° decreases by 3% to 7%, and the brightness at 60° decreases by 3% to 7%.

[0123] Example 3

[0124] Continue to refer Figure 2, α is between 50° and 60°, d is between 0.8um and 1um, h is between 2.4um and 3um, the outer slope angle of the pixel definition layer is greater than or equal to the slope angle of the reflector cup, and the outer plane height of the pixel definition layer is between 0.5um and 1.5um higher than the height of the reflector cup. Figure 8 and Fig. 9 The black matrix layers 140L1 and L2 are 1um to 3um wider than the light emitting device 120, and D1 and D2 are 1um to 3um narrower than the width between adjacent light emitting devices 120. The front brightness at 0° viewing angle increases by 10% to 20%, the brightness at 45° decreases by 4% to 6%, and the brightness at 60° decreases by 4% to 6%.

[0125] Example 4

[0126] Continue to refer Figure 2 , α is between 50° and 60°, d is between 1um and 2um, h is between 2.4um and 3um, the outer slope angle of the pixel definition layer is greater than or equal to the slope angle of the reflector cup, and the outer plane height of the pixel definition layer is between 0.5um and 1.5um higher than the height of the reflector cup. The black matrix layers 140L1 and L2 are between 1um and 3um wider than the light-emitting device 120, and D1 and D2 are between 1um and 3um narrower than the width between adjacent light-emitting devices 120. The front brightness at 0° viewing angle increases by 10% to 20%, the brightness at 45° decreases by 4% to 6%, and the brightness at 60° decreases by 4% to 6%.

[0127] Example 5

[0128] Continue to refer Figure 2 , α is between 60° and 70°, d is between 0.8um and 1um, h is between 2.4um and 3um, the outer slope angle of the pixel definition layer is greater than or equal to the slope angle of the reflector cup, and the outer plane height of the pixel definition layer is between 0.5um and 1.5um higher than the height of the reflector cup. The black matrix layers 140L1 and L2 are between 1um and 3um wider than the light-emitting device 120, and D1 and D2 are between 1um and 3um narrower than the width between adjacent light-emitting devices 120. The front brightness at 0° viewing angle increases by 5% to 10%, the brightness at 45° decreases by 4% to 6%, and the brightness at 60° decreases by 4% to 6%.

[0129] Example 6

[0130] The black matrix layer 140 may include a plurality of sub-layers 142, and along the direction away from the driving backplane 110, the size of the sub-light-transmitting hole 141a of the current sub-layer 142 is 0.1um to 0.3um larger than that of the previous sub-layer 142. In this example, the structure of the first reflective wall 131 can be combined with any of the above examples, and the front brightness at 0° viewing angle is increased by 4% to 20%, the brightness at 45° is attenuated by 3% to 60%, and the brightness at 60° is attenuated by 3% to 60%, and the brightness attenuation at a large viewing angle increases with the increase of n.

[0131] Example 7

[0132] Continue to refer Fig.10 , the black matrix layer 140 can be a combination of trapezoidal high and low refractive index materials, 142 is a low refractive index material, and 144 is a high refractive index material. In this case, the black matrix layer 140 can be a single layer or a multilayer. The structure of the first reflective wall 131 can be combined with any of the above examples, and the front brightness at 0° viewing angle is increased by 4% to 20%, the brightness at 45° is attenuated by 3% to 60%, and the brightness at 60° is attenuated by 3% to 60%. The brightness attenuation at a large viewing angle increases with the increase of n.

[0133] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A display panel, characterized in that: include: A driving backplane, the driving backplane comprising a first electrode; a light emitting device, the light emitting device being electrically connected to the first electrode; A first reflecting wall, wherein a first end of the first reflecting wall is connected to the first electrode, a second end of the first reflecting wall extends in a direction away from the driving backplane, the first reflecting wall is arranged adjacent to the light-emitting device, and a shortest distance between the first reflecting wall and the light-emitting device gradually increases in a direction away from the driving backplane.

2. The display panel according to claim 1, characterized in that: An angle between the first reflective wall and the driving back plate is greater than or equal to 40° and less than or equal to 70°.

3. The display panel according to claim 1, characterized in that: A distance between the first end of the first reflective wall and the light emitting device is greater than or equal to 0.8 μm and less than or equal to 2.5 μm.

4. The display panel according to claim 1, characterized in that: The shortest distance between the second end of the first reflective wall and the first electrode is greater than or equal to 1.5 μm and less than or equal to 3 μm.

5. The display panel according to claim 4, characterized in that: The display panel further includes a second reflective wall, the second reflective wall is connected to the second end of the first reflective wall, and the second reflective wall extends in a direction away from the opening area.

6. The display panel according to claim 1, characterized in that: The display panel further includes a pixel definition layer, wherein the pixel definition layer is located between two adjacent light emitting devices, and the first reflective wall is embedded in the pixel definition layer.

7. The display panel according to claim 6, characterized in that: The pixel definition layer includes a first sublayer and a second sublayer, the first sublayer is located on the side of the first reflective wall facing the light-emitting device, the second sublayer is located on the side of the first reflective wall away from the light-emitting device, and the extinction coefficient of the first sublayer is less than or equal to 0.

001.

8. The display panel according to any one of claims 1 to 7, characterized in that: Along the direction away from the driving backplane, the light emitting device includes a first sub-device and a second sub-device in sequence, the first sub-device and the second sub-device are stacked, and the first sub-device and the second sub-device have different thicknesses.

9. The display panel according to claim 8, characterized in that: The thickness of the second sub-component is greater than the thickness of the first sub-component.

10. The display panel according to claim 9, characterized in that: The thickness of the second sub-component is greater than or equal to 1.5 times the thickness of the first sub-component and less than or equal to 2 times the thickness of the first sub-component.

11. The display panel according to any one of claims 1 to 7, further comprising a black matrix layer, wherein the black matrix layer is arranged on a side of the light-emitting device away from the driving backplane, and the black matrix layer is provided with a light-transmitting hole opposite to the light-emitting device, and the opening of the light-transmitting hole gradually increases in a direction away from the light-emitting device.

12. The display panel according to claim 11, characterized in that: The black matrix layer includes a plurality of stacked sub-layers, each of which is provided with a sub-light-transmitting hole. The plurality of sub-light-transmitting holes are arranged relatively to form the light-transmitting hole. Of two adjacent sub-light-transmitting holes, the sub-light-transmitting hole farther away from the light-emitting device has a larger opening.

13. A display device, characterized in that: The invention comprises the display panel as claimed in any one of claims 1 to 12.

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