Display panel and display device

Abstract

A display panel. The display panel comprises a light extraction unit. The orthographic projection of the light extraction unit on a driving backplane (1) partially overlaps the orthographic projection of a corresponding light-emitting device (220) on the driving backplane (1). A center (101) of the light extraction unit is offset along an inward-deflecting direction relative to a center (101) of the corresponding light-emitting device (220). Emergent light of the corresponding light-emitting device (220) passes through the light extraction unit and enters eyeballs along the inward-deflecting direction, to achieve an inward-deflecting chief ray angle θ, thereby significantly improving the overall brightness of the display panel at a front viewing angle. When the display panel is used in a display device, there is no need to separately provide a reflector group to cause the light exiting from the light extraction unit to propagate in the inward-deflecting direction, thereby reducing the weight of the display device. Also provided is a display device comprising the display panel.

Description

Display panel and display device

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority to Chinese Patent Application No. 202410876270.2, filed on July 1, 2024, entitled “Display panel and display device”, the entire contents of which are incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of display, in particular to a display panel and a display device. BACKGROUND

[0004] An organic light emitting diode (OLED) display panel has the characteristics of thin thickness, light weight, large screen viewing angle, and fast response speed, and is widely used in various aspects.

[0005] In the case where the main light ray angle is 0°, there is a large gap between the observation angle of the eyeball at the edge of the display panel and the main light ray angle, and the light intensity entering the eyeball is weak, so that the brightness of the observed display picture is poor. When applied to a display device, a mirror group needs to be separately arranged to internally collect light, and the weight of the display device is large.

[0006] It should be noted that the information disclosed in the above background section of the application is only used to strengthen the understanding of the background of the application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art.

[0007] SUMMARY

[0008] The purpose of the present application is to overcome the problem that when there is a large gap between the observation angle of the eyeball at the edge of the display panel and the main light ray angle, the brightness uniformity of the observed display picture is poor, and to provide a display panel and a display device.

[0009] According to one aspect of the present application, a display panel is provided, which includes a driving backplane, a planarization layer, a plurality of light emitting devices, and a light extraction unit. The planarization layer is arranged on one side of the driving backplane. The plurality of light emitting devices are spaced apart from the planarization layer on a side away from the driving backplane. The light emitting device includes a first electrode, a light emitting unit, and a second electrode layer arranged in sequence in a direction away from the driving backplane. The light extraction unit is arranged on a side of the second electrode layer away from the driving backplane. The orthographic projection of the light extraction unit on the driving backplane partially overlaps with the orthographic projection of the corresponding light emitting device on the driving backplane. The center of the light extraction unit is offset relative to the center of the corresponding light emitting device in an internal collection direction, which is a direction from the edge of the display panel to the center of the display panel.

[0010] In an embodiment of the present disclosure, the display panel further comprises a color filter layer and a plurality of microlenses, the color filter layer is disposed on the side of the plurality of light emitting devices away from the driving backplane, the color filter layer comprises at least three different color filter units, the orthographic projection of the color filter unit on the driving backplane overlaps the orthographic projection of the corresponding light emitting device on the driving backplane, the plurality of microlenses are disposed on the side of the color filter layer away from the driving backplane, the orthographic projection of the microlens on the driving backplane overlaps the orthographic projection of the corresponding light emitting device on the driving backplane, and the light extraction unit comprises the color filter unit and / or the microlens.

[0011] In an embodiment of the present disclosure, the microlens is a semi-spherical structure, the center of the microlens is offset in the converging direction relative to the center of the corresponding light emitting device, and the offset amount of the microlens relative to the light emitting device is equal to the offset amount of the color filter unit relative to the light emitting device.

[0012] In an embodiment of the present disclosure, the center of each light extraction unit is gradually reduced in the converging direction relative to the center of the corresponding light emitting device.

[0013] In an embodiment of the present disclosure, the converging direction comprises a first converging direction and a second converging direction intersecting each other, the width of the display area of the display panel along the first converging direction is smaller than the width along the second converging direction, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device along the first converging direction is a first offset distance, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device along the second converging direction is a second offset distance, and the first offset distance is smaller than the second offset distance.

[0014] In an embodiment of the present disclosure, the converging direction comprises a first converging direction and a second converging direction intersecting each other, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device along the first converging direction is a first offset distance, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device along the second converging direction is a second offset distance, and the first offset distance is equal to the second offset distance.

[0015] In an embodiment of the present disclosure, the converging direction further comprises a third converging direction, the third converging direction is located between the first converging direction and the second converging direction along the circumferential direction, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device along the third converging direction is a third offset distance, and the third offset distance is equal to the first offset distance and the second offset distance.

[0016] In an embodiment of the present disclosure, the converging direction further comprises a third converging direction, the third converging direction is located between the first converging direction and the second converging direction along the circumferential direction, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device along the third converging direction is a third offset distance, and the third offset distance is greater than the first offset distance and the second offset distance.

[0017] In one embodiment of the present application, the inward converging direction comprises a first inward converging direction and a second inward converging direction intersecting with each other, a width of the display area of the display panel along the first inward converging direction is less than a width of the display area of the display panel along the second inward converging direction, an offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device along the first inward converging direction is a first offset distance, an offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device along the second inward converging direction is a second offset distance, and the first offset distance is greater than the second offset distance.

[0018] In one embodiment of the present application, a distance between the side of the plurality of light emitting devices away from the driving backplane and the side of the microlens close to the driving backplane is H, and an offset of the microlens relative to the light emitting device is D, and D≤2 / 3H.

[0019] In one embodiment of the present application, the microlens is a prism structure, the prism structure comprises a fitting surface and a refractive surface, the fitting surface is parallel to the surface of the driving backplane, and the refractive surface is inclined inwardly relative to the fitting surface, and the emergent light of the light emitting device converges towards the center of the display panel along the inward converging direction after passing through the refractive surface.

[0020] In one embodiment of the present application, the angle between the refractive surface and the fitting surface of different prism structures gradually decreases along the inward converging direction.

[0021] In one embodiment of the present application, the distance between the adjacent two microlenses is greater than 1 / 10 of the width of the microlens and less than 1 / 2 of the width of the microlens.

[0022] According to another aspect of the present application, a display device is provided, comprising the display panel provided by one aspect of the present application.

[0023] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0025] FIG. 1 is a schematic cross-sectional view of a driving backplane and a plurality of light emitting devices according to an embodiment of the present application.

[0026] FIG. 2 is a schematic cross-sectional view of a display panel according to an embodiment of the present application.

[0027] Figure 3 is a schematic diagram of a cross-section of a portion of a display panel according to an embodiment of the present application, when the filter units and the microlenses are shifted in the outward direction relative to the light emitting units.

[0028] Figure 4 is a schematic diagram of a portion of a display panel according to an embodiment of the present application, when the centers of the microlenses are shifted in the inward direction relative to the centers of the corresponding light emitting devices.

[0029] Figure 5 is a schematic diagram of a plan view of a distribution pattern of a plurality of microlenses arranged in a circular array according to an embodiment of the present application.

[0030] Figure 6 is a schematic diagram of a plan view of a distribution pattern of a plurality of microlenses arranged in a square array according to an embodiment of the present application.

[0031] Figure 7 is a schematic diagram of a plan view of a distribution pattern of a plurality of microlenses arranged in an elliptical array according to an embodiment of the present application.

[0032] Figure 8 is a schematic diagram of a portion of a display panel according to an embodiment of the present application, when a light folding layer is provided on the side of the color filter layer away from the drive backplane.

[0033] In the drawings: 1 - drive backplane, 10 - substrate, 11 - transistor, 111 - gate, 112 - active layer, 113 - first electrode, 114 - second electrode, 115 - gate insulating layer, 12 - first transistor, 13 - second transistor, 14 - contact hole, 15 - insulating layer, 16 - third conductive layer, 100 - drive circuit layer, 21 - first conductive layer, 22 - light emitting layer, 23 - second conductive layer, 220 - light emitting device, 2201 - first light emitting device, 2202 - second light emitting device, 2203 - third light emitting device, 221 - first electrode, 222 - second electrode layer, 223 - light emitting unit, 3 - thin film encapsulation layer group, 31 - first thin film encapsulation layer, 32 - second thin film encapsulation layer, 4 - color filter layer, 41 - filter unit, 5 - microlens layer, 51 - microlens, 6 - cover plate, 7 - light folding layer, 71 - right-angled triangular prism, 101 - center, 102 - edge. DETAILED DESCRIPTION

[0034] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the drawings, and descriptions of the same or similar elements can be not be repeated. In addition, the drawings are to be considered in the illustrative mode, and not necessarily to scale.

[0035] Although relative terms are used in this specification, such as "upper", "lower", to describe one component's relative relationship to another component of the icon, these terms are used herein for convenience only and are not intended to limit the scope of the application, for example, to the direction in the examples in the drawings. It is understood that if the device of the icon is turned upside down, the component described as "upper" will become the component described as "lower". When a structure is "on" another structure, it can mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0036] The terms "one", "an", "the", "said", and "at least one" are used to denote the presence of one or more elements / specific parts / etc.; the terms "include" and "have" are used to indicate an open-ended inclusion of the elements / specific parts / etc. listed in the specification; and the terms "first", "second", and "third" and the like are used only as labels, not as a limitation on their objects.

[0037] As shown in FIG. 1, the micro-organic light-emitting diode (micro-OLED) display panel has the advantages of small volume, light weight, high contrast, fast response speed, and low power consumption, and is easier to achieve a higher pixel density, so it is widely used in augmented reality (AR) display devices and virtual reality (VR) display devices.

[0038] As shown in FIG. 1, the display panel provided by the embodiment of the application uses a silicon substrate as a substrate 10, and a driving circuit layer 100 can be integrated on the silicon substrate to form a driving backplane 1. In this case, the silicon circuit can achieve higher precision. A first light-emitting element and a second light-emitting element are formed on the driving backplane 1, which includes a substrate 10 and a driving circuit layer 100 formed on the substrate 10. The silicon substrate is, for example, single crystal silicon or high-purity silicon.

[0039] The driving circuit layer 100 is formed on the substrate 10 by a semiconductor process, for example, by a doping process to form an active layer 112 (i.e., a semiconductor layer), a first electrode 113, and a second electrode 114 of a transistor 11 in the substrate 10, by a silicon oxidation process to form an insulating layer 15, and by a sputtering process to form a plurality of third conductive layers 16, etc. The semiconductor layer (e.g., the active layer in FIG. 1) of the transistor 11 is located inside the substrate 10 or is part of the substrate 10.

[0040] As shown in FIG. 1, the first light emitting element is electrically connected with the first transistor 12, and the second light emitting element is electrically connected with the second transistor 13. Embodiments of the present application do not limit the specific type of the first transistor 12 and the second transistor 13. The first transistor 12 is exemplarily described below, which is also applicable to the second transistor 13, and thus is not described again.

[0041] The first electrode 221 of the first light emitting element is formed on the surface of the driving backplane 1, and is electrically connected with the first electrode 113 of the first transistor 12 through the contact hole 14 filled with conductive material (e.g. tungsten) and the plurality of conductive layers. One insulating layer 15 and two third conductive layers 16 are exemplarily shown in FIG. 1, however, embodiments of the present application do not limit the number of insulating layers 15 and conductive layers.

[0042] For example, the first transistor 12 includes a gate 111, a gate insulating layer 115, an active layer 112, a first electrode 113 and a second electrode 114. Embodiments of the present application do not limit the type, material and structure of the first transistor 12, for example, it can be a top-gate type, a bottom-gate type, etc., the active layer 112 of the first transistor 12 can be an inorganic semiconductor material such as microcrystalline silicon, amorphous silicon, polycrystalline silicon (low-temperature polycrystalline silicon or high-temperature polycrystalline silicon), oxide semiconductor (e.g. IGZO), etc., or can also be an organic material such as PBTTT, PDBT-co-TT, PDQT, PDVT-10, organic semiconductor material such as dinaphtho-naphthodithiophene (DNTT) or pentacene, etc. For example, the first transistor 12 can be N-type or P-type.

[0043] Some embodiments of the present application are described taking a field effect transistor (e.g. MOS field effect transistor) formed in a silicon substrate as an example, in which the silicon substrate is doped (p-type doping or n-type doping) to form the active layer 112 of the transistor, i.e. the active layer 112 of the transistor is located in the silicon substrate, or the active layer 112 of the transistor is part of the silicon substrate. The source and drain of the transistor used here can be symmetrical in structure, so they can be indistinguishable in structure. In embodiments of the present application, in order to distinguish the two poles of the transistor other than the gate, for example, one pole is directly described as the first electrode 113, and the other pole is directly described as the second electrode 114.

[0044] The topmost conductive layer in the drive backplane 1 can have reflectivity, for example, a laminated structure of titanium / nitride titanium / aluminum. For example, the conductive layer includes a plurality of sub-layers arranged at intervals, which are respectively arranged one-to-one with the plurality of first electrodes 221 included in the first conductive layer 21. In a top emission structure, the conductive layer can be arranged as a reflective layer for reflecting light emitted by the light emitting element, improving light extraction efficiency. For example, the orthographic projection of each electrode in the first conductive layer 21 on the substrate 10 falls within the orthographic projection on the substrate 10 of the portion of the conductive layer corresponding to the electrode. In this case, the first conductive layer 21 can use a transparent conductive oxide material with a high work function, such as ITO, IZO, IGZO, AZO, etc.

[0045] The light emitting device includes a first light emitting device 2201 and a second light emitting device 2202 respectively located in the first sub-pixel region and the second sub-pixel region. The first light emitting device 2201 and the second light emitting device 2202 each include a light emitting unit 223, and the light emitting unit 223 is opposite to the first electrode 221 and the second electrode layer 222. For example, the first light emitting device 2201 and the second light emitting device 2202 can be organic light emitting diodes (OLED) or quantum dot light emitting diodes (QLED), etc., and the embodiments of the present application are not limited to the type of light emitting element. For example, the light emitting unit 223 can be a small molecule organic material or a high polymer organic material.

[0046] For example, the first light emitting device 2201 and the second light emitting device 2202 are in a top emission structure, and the first electrode 221 and the second electrode layer 222 have reflectivity. For example, the first electrode 221 includes a material with a high work function and a high reflectivity to serve as an anode, for example, a laminated structure of Ti / Al / Ti / Mo, in which titanium metal can serve as a buffer layer to improve the adhesion between layers, Al as a high reflectivity material, and Mo as a high work function material directly contacting the organic functional layer to improve the injection capability of carriers. Correspondingly, the second conductive layer 23 serves as a cathode, for example, the second conductive layer 23 can be a transparent conductive material or a laminated structure of a transparent conductive material and a metal material. For example, the second conductive layer 23 can be a transparent metal oxide conductive material, such as indium zinc oxide (IZO), indium tin oxide (ITO), indium gallium zinc oxide (IGZO), etc., and can also be a transparent nanometer conductive material such as carbon nanotube, graphene, nanometer silver wire, etc. The light emitting layer 22 is composed of a plurality of light emitting units 223 arranged between the first conductive layer 21 and the second conductive layer 23.

[0047] It should be noted that the transistors 11 used in the embodiments of the present application can be thin film transistors, field effect transistors or other switching devices with the same characteristics. When the transistors 11 are thin film transistors, the driving circuit layer 100 can include a plurality of driving circuit units, and any one of the driving circuit units can include a transistor 11 and a storage capacitor, and the plurality of driving circuit units constitute the driving circuit layer 100.

[0048] As shown in FIG. 2, because the material of the light emitting unit 223 and the material of the second electrode layer 222 are relatively sensitive to water and oxygen and are easily oxidized by water and oxygen, a thin film encapsulation layer group 3 (TFE) is arranged on the side of the second electrode layer 222 away from the driving backboard 1, so as to isolate the light emitting device 220 from water and oxygen and protect the light emitting device 220.

[0049] The thin film encapsulation layer group 3 is provided with a color filter layer 4 on the side away from the driving backboard 1, and the color filter layer 4 includes three different color filter units 41, i.e., a red color filter unit 41, a green color filter unit 41 and a blue color filter unit 41. The orthographic projection of the color filter unit 41 on the driving backboard 1 overlaps the orthographic projection of the corresponding light emitting device 220 on the driving backboard 1. The light emitting device 220 can be a white light emitting device 220, and the red color filter unit 41, the green color filter unit 41 and the blue color filter unit 41 can respectively realize the transmission of red light, green light and blue light by absorbing light of specific wavelengths.

[0050] In order to enhance the brightness of the display, a plurality of microlenses 51 are arranged on the side of the thin film encapsulation layer group 34 away from the driving backboard 1 to converge the light transmitted by the color filter unit 41. The orthographic projection of the microlens 51 on the driving backboard 1 overlaps the orthographic projection of the corresponding light emitting device 220 on the driving backboard 1, and the microlens 51 can converge the light transmitted by the color filter unit 41, thereby improving the brightness of the display panel at the normal viewing angle. In order to protect the microlens layer 5, a cover plate 6 can be formed on the side of the microlens layer 5 away from the substrate 10.

[0051] As shown in FIG. 3, the thin film encapsulation layer group 3 can include a first thin film encapsulation layer 31 and a second thin film encapsulation layer 32. The first thin film encapsulation layer 31 (TFE) can be arranged on the side of the second electrode layer 222 away from the driving backboard 1, so as to isolate the light emitting device 220 from water and oxygen and protect the light emitting device 220. In order to protect the color filter layer 4, the second thin film encapsulation layer 32 can be formed on the side of the color filter layer 4 away from the substrate 10.

[0052] In the case of the main light ray angle of 0°, there is a large difference between the main light ray angle of the edge of the display panel and the observation angle of the eyeball, and the light intensity entering the eyeball is weak, so that the brightness uniformity of the observed display panel is poor. By offsetting the light filtering unit 41 and the microlens 51 relative to the first electrode 221, the change of the main light ray angle can be realized. By controlling the offset distance of the light filtering unit 41 and the microlens 51 in different regions, the main light ray angle can be matched with the observation angle, so that the brightness of the region of the display panel observed at the observation angle is always maintained at the maximum.

[0053] As shown in FIG. 3, at present, by offsetting the light filtering unit 41 and the microlens 51 relative to the light emitting unit 223 in the outward expansion direction x, the outward expansion type angle customization can be realized, and the outward expansion direction x is the direction from the center 101 of the display panel to the edge 102 of the display panel. Since the outward expansion type main light ray angle θ becomes larger and larger from the center line of the display panel to the edge 102 of the display panel, the brightness loss at the edge 102 of the display panel under the normal viewing angle is more, and there is a problem of color deviation. In addition, when the display panel with the outward expansion type main light ray angle θ is applied to a display device, an additional mirror group is needed to reflect the outward expansion light rays of the edge 102 of the display panel to an acceptable angle range, resulting in a relatively heavier weight of the display device.

[0054] Based on this, the embodiment of the present application provides a display panel. As shown in FIG. 1 and FIGS. 4 to 8, the display panel comprises a driving backboard 1, a planarization layer, a plurality of light emitting devices 220 and a light extraction unit, the planarization layer is arranged on one side of the driving backboard 1, the plurality of light emitting devices 220 are arranged on the side of the planarization layer away from the driving backboard 1, the light emitting device 220 comprises a first electrode 221, a light emitting unit 223 and a second electrode layer 222 arranged in sequence in the direction away from the driving backboard 1, and the light extraction unit is arranged on the side of the second electrode layer 222 away from the driving backboard 1, the orthographic projection of the light extraction unit on the driving backboard 1 partially overlaps with the orthographic projection of the corresponding light emitting device 220 on the driving backboard 1, and the center 101 of the light extraction unit is offset relative to the center 101 of the corresponding light emitting device 220 in the inward convergence direction y, and the inward convergence direction y is the direction from the edge 102 of the display panel to the center 101 of the display panel.

[0055] The orthographic projection of the light extraction unit on the driving backboard 1 partially overlaps with the orthographic projection of the corresponding light emitting device 220 on the driving backboard 1, and the center 101 of the light extraction unit is offset relative to the center 101 of the corresponding light emitting device 220 in the inward convergence direction, and the emergent light rays of the corresponding light emitting device 220 pass through the light extraction unit and enter the eyeball in the direction of the inward offset, so that the inward convergence type main light ray angle θ is achieved, and the overall brightness of the display panel under the normal viewing angle can be obviously improved. When applied to a display device, there is no need to separately arrange a mirror group to converge the light rays passing through the light extraction unit, so that the weight of the display device can be reduced.

[0056] The display panel involved in the embodiment of the present application is described in detail below in combination with specific examples.

[0057] As shown in FIG. 4, the display panel includes a driving backplane 1, a planarization layer, a plurality of light emitting devices 220 and a light extraction unit, the planarization layer is arranged on one side of the driving backplane 1, the plurality of light emitting devices 220 are arranged on one side of the driving backplane 1 at intervals, the light emitting device 220 includes a first electrode 221, a light emitting unit 223 and a second electrode layer 222 arranged in sequence in a direction away from the driving backplane, the light extraction unit is arranged on one side of the second electrode layer 222 away from the driving backplane 1, the orthographic projection of the light extraction unit on the driving backplane 1 partially overlaps the orthographic projection of the corresponding light emitting device 220 on the driving backplane 1, and the center 101 of the light extraction unit is offset relative to the center 101 of the corresponding light emitting device 220 in a converging direction y, which is a direction from the edge 102 of the display panel to the center 101 of the display panel.

[0058] The light emitting device 220 includes a first light emitting device 2201, a second light emitting device 2202 and a third light emitting device 2203 of different colors, the center 101 of the light extraction unit is offset relative to the center 101 of the corresponding light emitting device 220 in the converging direction, the emergent light of the corresponding light emitting device 220 passes through the light extraction unit and enters the eyeball in the direction of the offset inward, achieving a converging type chief ray angle θ, which can significantly improve the overall brightness of the display panel at the normal viewing angle. When applied to a display device, a mirror group does not need to be separately arranged to converge the light passing through the light extraction unit, which can reduce the weight of the display device. Because the normal viewing angle gradually decreases in the converging direction, the offset distance of the center 101 of each light extraction unit relative to the center 101 of the corresponding light emitting device in the converging direction can be gradually reduced, which can make the uniformity of the improvement of the overall brightness of the display panel at the normal viewing angle better.

[0059] The color film layer 4 is arranged on one side of the plurality of light emitting devices 220 away from the driving backplane 1, the color film layer 4 includes at least three filter units 41 of different colors, the orthographic projection of the filter unit 41 on the driving backplane 1 overlaps the orthographic projection of the corresponding light emitting device 220 on the driving backplane 1, a plurality of microlenses 51 are arranged on one side of the color film layer 4 away from the driving backplane 1, and the orthographic projection of the microlens 51 on the driving backplane 1 overlaps the orthographic projection of the corresponding light emitting device 220 on the driving backplane 1. The light extraction unit includes the filter unit 41 and / or the microlens 51.

[0060] The light extraction unit can include a filter unit 41, a center 101 of the filter unit 41 is offset in a converging direction y relative to a center 101 of a corresponding light emitting device 220, the converging direction y is a direction from an edge 102 of the display panel to the center 101 of the display panel. The emergent light rays of the corresponding light emitting device 220 pass through the filter unit 41 and enter the eyeball in the inwardly offset direction, achieving a converging type chief ray angle θ, which can significantly improve the overall brightness of the display panel at the normal viewing angle and improve the color cast problem of the edge 102 of the display panel. When applied to a display device, there is no need to separately set a mirror group to converge the light passing through the filter unit 41, which can reduce the weight of the display device.

[0061] The light extraction unit can also include a microlens 51, a center 101 of the microlens 51 is offset in a converging direction y relative to a center 101 of a corresponding light emitting device 220, and the offset amount of the microlens 51 relative to the light emitting device 220 is equal to the offset amount of the filter unit 41 relative to the light emitting device 220. The microlens 51 can converge the inwardly offset light rays, and play a greater role in achieving a converging type chief ray angle θ. By setting the offset distance of the microlens 51 in different converging directions y, so that a plurality of microlenses 51 form different distribution patterns, it can be better applied to display panels of different shapes.

[0062] It should be noted that the distance between the two adjacent microlenses 51 is greater than 1 / 10 of the width of the microlens 51 and less than 1 / 2 of the width of the microlens 51. In this embodiment, the distance between the two adjacent microlenses 51 can be 0.4 μm-5 μm. In this way, the adhesion between the microlenses 51 can be avoided, and the light extraction effect is not affected.

[0063] When the microlens 51 is a hemispherical structure, as shown in FIGS. 5-7, the converging direction y includes a first converging direction y1 and a second converging direction y2, the second converging direction y2 is perpendicular to the first converging direction y1, the offset distance of the center 101 of the microlens 51 relative to the center 101 of the corresponding light emitting device 220 in the first converging direction y1 is a first offset distance, the offset distance of the center 101 of the microlens 51 relative to the center 101 of the corresponding light emitting device 220 in the second converging direction y2 is a second offset distance, and the first offset distance is equal to the second offset distance. The dashed box is the position of the microlens 51 before offset, and the solid box is the position of the microlens 51 after offset.

[0064] As shown in FIG. 5, the plurality of microlenses 51 are arranged to form a distribution pattern of a circular array, which has strong versatility and can be applied to display panels of different shapes. The distance between two adjacent microlenses 51 in the first inward direction y1, the distance between two adjacent microlenses 51 in the second inward direction y2, and the distance between two adjacent microlenses 51 in the third inward direction y3 are equal. The inward directions further include a third inward direction y3, which is located between the first inward direction y1 and the second inward direction y2 along the circumferential direction, and specifically, the third inward direction y3 is located on the middle line of the first inward direction y1 and the second inward direction y2 along the circumferential direction. The offset distance of the center 101 of the microlens 51 relative to the center 101 of the corresponding light emitting device 220 in the third inward direction y3 is a third offset distance. The fourth inward direction y4 is between the first inward direction y1 and the third inward direction y3 and between the second inward direction y2 and the third inward direction y3. The offset distance of the center 101 of the microlens 51 relative to the center 101 of the corresponding light emitting device 220 in the fourth inward direction y4 is a fourth offset distance. On the same circular ring, the first offset distance, the second offset distance, the third offset distance, and the fourth offset distance are equal.

[0065] As shown in FIG. 6, the plurality of microlenses 51 are arranged to form a distribution pattern of a square array, which is suitable for square display panels. The distance between two adjacent microlenses 51 in the first inward direction y1 is equal to the distance between two adjacent microlenses 51 in the second inward direction y2, and the distance between two adjacent microlenses 51 in the third inward direction y3 is greater than the distance between two adjacent microlenses 51 in the first inward direction y1. The difference from FIG. 5 is that, on the same square, the third offset distance is greater than the first offset distance and the second offset distance, and the offset component of the third offset distance in the first inward direction y1 is equal to the offset component in the second inward direction y2. The fourth offset distance is greater than the first offset distance and the second offset distance, and less than the third offset distance. The offset component of the fourth offset distance in the first inward direction y1 is not equal to the offset component in the second inward direction y2.

[0066] As shown in FIG. 7, the plurality of microlenses 51 are arranged to form an elliptical array distribution pattern, the distance between two adjacent microlenses 51 in the first inward direction y1 is less than the distance between two adjacent microlenses 51 in the second inward direction y2, which is suitable for a display panel with a display area width in the first inward direction y1 less than the width in the second inward direction y2. Different from FIG. 5 and FIG. 6, in the same ellipse, the first offset distance is less than the second offset distance, because the observation area width of the two eyes in the first inward direction y1 is smaller, so the first offset distance is smaller to match the narrower observation area, and the observation area width of the two eyes in the second inward direction y2 is larger, so the second offset distance is larger to match the wider observation area. In other implementable embodiments, the first offset distance can also be greater than the second offset distance.

[0067] For display panels with higher display picture uniformity requirements, the microlenses 51 with hemispherical structures are generally not arranged on the side of the color film layer 4 away from the substrate 10, so as to avoid the convergence effect of the microlenses 51 with hemispherical structures changing the principal ray angle and affecting the adjustment accuracy of the offset distance on the principal ray angle. As shown in FIG. 8, in order to ensure the adjustment accuracy of the principal ray angle θ, the microlenses 51 with prism structures can be arranged on the side of the color film layer 4 away from the driving backboard 1, and a plurality of microlenses with prism structures form a light folding layer 7. The microlenses with prism structures can be right triangle prisms 71, which include a matching surface and a refracting surface. The matching surface is parallel to the surface of the driving backboard 1, and the refracting surface is inclined inwardly in the inward direction relative to the matching surface. After the light emitted by the light emitting device 220 passes through the refracting surface, the light converges along the inward direction towards the center 101 of the display panel.

[0068] In the inward direction, the included angle between the refracting surface and the matching surface of different right triangle prisms 71 gradually decreases, so that the principal ray angle θ of the display panel gradually decreases in the inward direction, and the observation angle of the eyeball also gradually decreases in the inward direction. Therefore, the principal ray angle θ adjusted by the light folding layer 7 can match the observation angle at different positions, so as to ensure that the light intensity entering the eyeball is always maximum, to ensure the display picture brightness while improving the display picture uniformity.

[0069] The display device can include the display panel mentioned above in the embodiments of the present application. The specific structure and advantages of the display device can refer to the display panel, and the specific structure and advantages of the display panel have been described in detail above, and thus will not be described here.

[0070] It should be noted that the display device includes other necessary components and compositions in addition to the display panel, for example, a housing, a circuit board, a power line, etc., and a person skilled in the art can supplement accordingly according to the specific use requirements of the display device, which will not be described here.

[0071] The display device can be a conventional electronic device, such as a mobile phone, a computer, a television, and a camcorder, or an emerging wearable device, such as a virtual reality device and an augmented reality device, without being limited thereto.

[0072] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

Claims

1. A display panel, wherein, The display panel comprises: a driving back plate; a planarization layer disposed on one side of the driving back plate; a plurality of light emitting devices spaced apart from the planarization layer away from the driving back plate, the light emitting device comprising a first electrode, a light emitting unit and a second electrode layer arranged in sequence away from the driving back plate; a light extraction unit disposed on the second electrode layer away from the driving back plate, the light extraction unit has a projection on the driving back plate partially overlapping with a projection of the light emitting device on the driving back plate, and the center of the light extraction unit is offset relative to the center of the light emitting device in a converging direction, the converging direction being a direction from the edge of the display panel to the center of the display panel.

2. The display panel of claim 1, wherein, The display panel further comprises a color film layer and a plurality of microlenses, the color film layer is disposed on the side of the plurality of light emitting devices away from the driving back plate, the color film layer comprises at least three different color filter units, the color filter unit has a projection on the driving back plate partially overlapping with a projection of the light emitting device on the driving back plate, the plurality of microlenses are disposed on the side of the color film layer away from the driving back plate, the microlens has a projection on the driving back plate partially overlapping with a projection of the light emitting device on the driving back plate, and the light extraction unit comprises the color filter unit and / or the microlens.

3. The display panel of claim 2, wherein, The microlens is a hemispherical structure, the center of the microlens is offset relative to the center of the light emitting device in the converging direction, and the offset amount of the microlens relative to the light emitting device is equal to the offset amount of the color filter unit relative to the light emitting device.

4. The display panel of claim 1, wherein, In the converging direction, the offset distance of the center of each light extraction unit relative to the center of the corresponding light emitting device gradually decreases.

5. The display panel of claim 1, wherein, The converging direction includes intersecting first and second converging directions, the display area of the display panel has a width in the first converging direction smaller than a width in the second converging direction, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device in the first converging direction is a first offset distance, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device in the second converging direction is a second offset distance, and the first offset distance is smaller than the second offset distance.

6. The display panel of claim 2, wherein, The converging direction includes intersecting first and second converging directions, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device in the first converging direction is a first offset distance, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device in the second converging direction is a second offset distance, and the first offset distance is equal to the second offset distance.

7. The display panel of claim 6, wherein, The converging direction further includes a third converging direction, the third converging direction is located between the first and second converging directions in a circumferential direction, the offset distance of the center of the light extraction unit relative to the center of the corresponding light emitting device in the third converging direction is a third offset distance, and the third offset distance is equal to the first and second offset distances.

8. The display panel of claim 6, wherein, The inward converging directions further include a third inward converging direction, the third inward converging direction is located between the first inward converging direction and the second inward converging direction along a circumferential direction, a distance of offset of the center of the light extraction unit relative to the center of the light emitting device along the third inward converging direction is a third offset distance, the third offset distance is greater than the first offset distance and the second offset distance.

9. The display panel of claim 2, wherein, The inward converging directions include intersecting first and second inward converging directions, a width of a display area of the display panel along the first inward converging direction is less than a width of the display area along the second inward converging direction, a distance of offset of the center of the light extraction unit relative to the center of the light emitting device along the first inward converging direction is a first offset distance, a distance of offset of the center of the light extraction unit relative to the center of the light emitting device along the second inward converging direction is a second offset distance, the first offset distance is greater than the second offset distance.

10. The display panel of claim 2, wherein, A distance between the side of the plurality of light emitting devices away from the driving back plate and the side of the microlens close to the driving back plate is H, an offset of the microlens relative to the light emitting device is D, and D≤2 / 3H.

11. The display panel of claim 2, wherein, The microlens is a prism structure, the prism structure includes a fitting surface and a refracting surface, the fitting surface is parallel to a surface of the driving back plate, the refracting surface is inclined to the inward converging direction relative to the fitting surface, and an emergent light ray of the light emitting device converges to the center of the display panel along the inward converging direction after passing through the refracting surface.

12. The display panel of claim 11, wherein, Along the inward converging direction, angles between the refracting surface and the fitting surface of different prism structures gradually decrease.

13. The display panel of claim 2, wherein, A distance between two adjacent microlenses is greater than 1 / 10 of a width of the microlens and less than 1 / 2 of the width of the microlens.

14. A display device, wherein, A display panel including any one of claims 1 to 13.

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