Display panel and augmented reality device

Abstract

The embodiment of the invention provides a display panel and augmented reality equipment, relates to the technical field of display, and aims to solve the problem of poor uniformity of display images presented to a user when the display panel is applied to the augmented reality equipment in the related technology. The display panel is applied to the augmented reality equipment, the display panel is provided with a display area, the display area comprises a first sub-display area and a second sub-display area surrounding the first sub-display area, the first sub-display area surrounds the geometric center of the display area, and the second sub-display area surrounds the geometric center of the display area. The display panel comprises a plurality of first light-emitting devices located in the first sub-display area, and a plurality of second light-emitting devices located in the second sub-display area, and a plurality of second light-emitting devices located in the second sub-display area. Wherein the luminous efficiency of the second light-emitting device is greater than that of the first light-emitting device.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display panel and an extended reality device. Background Art

[0002] In related technologies, when a display panel is applied to an extended reality device including optical devices, the light emitted by the display panel enters the human eye after being adjusted by the optical devices, and the finally presented image usually has a problem that the brightness at the center position is higher than that at the edge position, that is, the problem of poor uniformity, which further leads to a poor imaging effect of the extended reality device. Summary of the Invention

[0003] Embodiments of this application provide a display panel and an extended reality device to at least solve the problem of poor uniformity of the display image presented to the user when the display panel is applied to the extended reality device in related technologies.

[0004] On the one hand, embodiments of this application provide a display panel applied to an extended reality device. The display panel has a display area, and the display area includes a first sub-display area and a second sub-display area surrounding the first sub-display area. The first sub-display area surrounds the geometric center of the display area. The display panel includes: a plurality of first light-emitting devices located in the first sub-display area; and a plurality of second light-emitting devices located in the second sub-display area. Among them, the luminous efficiency of the second light-emitting device is greater than that of the first light-emitting device.

[0005] In some embodiments, a plurality of the first light-emitting devices are connected in parallel to each other, and a plurality of the second light-emitting devices are connected in parallel to each other. Among them, the arrangement density of the second light-emitting devices is different from that of the first light-emitting devices, so that the luminous efficiency of the second light-emitting devices is greater than that of the first light-emitting devices.

[0006] In some embodiments, the arrangement density of the second light-emitting devices is greater than that of the first light-emitting devices.

[0007] In some embodiments, the first light-emitting device includes a first nano light-emitting diode.

[0008] In some embodiments, the second light-emitting device includes a second nano light-emitting diode.

[0009] In some embodiments, the first light-emitting device includes a first nano light-emitting diode, and the second light-emitting device includes a second nano light-emitting diode; both the first nano light-emitting diode and the second nano light-emitting diode include a first electrode, a first semiconductor layer, a light-emitting layer, a second semiconductor layer, and a second electrode that are sequentially stacked. The first electrodes in a plurality of the first light-emitting devices are connected to each other, and the second electrodes are connected to each other; the first electrodes in a plurality of the second light-emitting devices are connected to each other, and the second electrodes are connected to each other.

[0010] In some embodiments, a plurality of spaced-apart first light-emitting units are provided in the first sub-display area, and each first light-emitting unit is composed of at least two first light-emitting devices; a plurality of spaced-apart second light-emitting units are provided in the second sub-display area, and each second light-emitting unit is composed of at least two second light-emitting devices. Among them, the arrangement density of the second light-emitting units is the same as that of the first light-emitting units.

[0011] In some embodiments, the geometric center of the first sub-display area coincides with the geometric center of the display area.

[0012] In some embodiments, the display area further includes a third sub-display area surrounding the second sub-display area; the display panel further includes a plurality of third light-emitting devices located in the third sub-display area, and the light-emitting efficiency of the third light-emitting devices is greater than that of the second light-emitting devices.

[0013] In some embodiments, a plurality of the third light-emitting devices are connected in parallel to each other, and the arrangement density of the third light-emitting devices is greater than that of the second light-emitting devices, so that the light-emitting efficiency of the third light-emitting devices is greater than that of the second light-emitting devices.

[0014] In some embodiments, the third light-emitting device includes a third nano light-emitting diode.

[0015] On the other hand, an embodiment of the present application further provides an extended reality device, and the extended reality device includes the display panel as described in any of the above embodiments.

[0016] For the display panel provided by the embodiment of the present application, since the light-emitting efficiency of the second light-emitting device is greater than that of the first light-emitting device, and the second light-emitting device is closer to the edge of the display area than the first light-emitting device, the difference in brightness between the position near the edge and the position near the center of the original image can be compensated by the difference in light-emitting efficiency between the second light-emitting device and the first light-emitting device, so that the difference in brightness between the position near the edge and the position near the center of the finally formed image is reduced or even disappears, thereby improving the brightness uniformity of the image and optimizing the display effect of the image. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is a schematic structural diagram of a display panel provided by some embodiments of the present application;

[0019] Figure 2 is a schematic structural diagram of an extended reality device provided by some embodiments of the present application;

[0020] Figure 3 is a curve graph of the change in the normal angle and the relative power of the light-emitting device at different half-life angles;

[0021] Figure 4A is a schematic structural diagram of a first light-emitting unit according to some embodiments of the present application;

[0022] Figure 4B is a schematic structural diagram of a second light-emitting unit according to some embodiments of the present application;

[0023] Figure 5 is a schematic diagram of the change relationship curve between the current density and the light-emitting device density and the change relationship curve between the current density and the relative efficiency of the light-emitting device;

[0024] Figure 6 is a schematic structural diagram of a display panel provided by some other embodiments of the present application. Detailed implementation manners

[0025] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The described technical solutions are only used to explain and illustrate the idea of the present application, and should not be regarded as a limitation on the protection scope of the present application.

[0026] In the description of the present application, it should be understood that terms such as "first", "second" and similar words do not represent any order, quantity or importance, but are only used to distinguish different technical features. Terms such as "multiple" and similar words mean two or more, unless otherwise clearly defined.

[0027] "A and / or B" includes the following three combinations: only A, only B, and the combination of A and B.

[0028] The use of "suitable for" or "configured to" in this application means open and inclusive language, which does not exclude devices that are suitable for or configured to perform additional tasks or steps. Additionally, the use of "based on" means open and inclusive because a process, step, calculation, or other action "based on" one or more of the stated conditions or values can in practice be based on additional conditions or values beyond those stated.

[0029] In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration". Any embodiment described as "exemplary" in this application is not necessarily to be construed as more preferred or advantageous than other embodiments. The following description is given to enable any person skilled in the art to make and use this application.

[0030] The various embodiments of this application are similar, and the features in different embodiments and / or different examples can be combined with each other.

[0031] In the related art, when a display panel is applied to an extended reality device including an optical device, the center of the display area of the display panel is usually located on the optical axis of the optical device. The optical device is used to modulate the light of the display panel to achieve a good display effect.

[0032] However, the luminous intensity of the light-emitting devices in the display panel usually decreases as the angle deviating from the horizontal plane perpendicular to the display panel increases. This often results in a higher propagation efficiency of the light emitted by the light-emitting devices near the center of the display panel when passing through the optical device compared to the light emitted by the light-emitting devices near the edge position when passing through the optical device, and further leads to a problem of poor uniformity in the finally observed picture with a bright center and a dark edge.

[0033] Based on this, some embodiments of this application provide a display panel, which is applied to an extended reality (XR) device. As an example, the extended reality device can be an augmented reality (AR) device. Of course, the extended reality device can also be a virtual reality (VR) device or a mixed reality (MR) device.

[0034] As Figure 1 shown, the display panel 100 has a display area AA, and the display area AA includes a first sub-display area A1 and a second sub-display area A2 surrounding the first sub-display area A1. The first sub-display area A1 surrounds the geometric center O of the display area AA. As an example, when the display area AA is rectangular, the geometric center O can be the focus of the two diagonals of the rectangle.

[0035] The display panel 100 includes: a plurality of first light-emitting devices 11 located in the first sub-display area A1 and a plurality of second light-emitting devices 12 located in the second sub-display area A2. In this case, the area where the second light-emitting devices 12 are located is farther from the geometric center O of the display area AA than the area where the first light-emitting devices 11 are located. That is to say, the first light-emitting devices 11 are closer to the geometric center O of the display area AA than the second light-emitting devices 12, or the second light-emitting devices 12 are closer to the edge of the display area AA than the first light-emitting devices 11.

[0036] Among them, the luminous efficiency of the second light-emitting devices 12 is greater than that of the first light-emitting devices 11.

[0037] It should be noted that when the display panel 100 is applied to an extended reality device, as Figure 2 shown, the geometric center O of the display area AA of the display panel 100 is located on the optical axis of the optical engine 200 in the extended reality device 300. The light emitted by the display panel 100 passes through the optical engine 200 and then shines on the target surface 201, and an image that can be observed by the human eye is formed on the target surface 201. Among them, the light emitted by the light-emitting device located at the geometric center O of the display area AA finally projects to the center position of the image, while the light emitted by the light-emitting device located at the edge of the display area AA finally projects to the edge position of the image.

[0038] Please continue to refer to Figure 2 , the light emitted by the light-emitting device at the edge position of the display panel 100 forms an angle α with the optical axis of the optical engine after passing through the axis of the optical engine 200. This angle α can be called the uniformity influence angle, and the larger the angle α, the greater the difference in brightness between the edge position and the center position of the image observed by the human eye. However, in the embodiment of the present application, the luminous efficiency of the second light-emitting devices 12 is greater than that of the first light-emitting devices 11, and the second light-emitting devices 12 are closer to the edge of the display area AA than the first light-emitting devices 11. In this way, the difference in luminous efficiency between the second light-emitting devices 12 and the first light-emitting devices 11 can be used to make up for the difference in brightness between the edge position and the center position of the image caused by the uniformity influence angle, so that the difference in brightness between the edge position and the center position of the finally formed image is reduced or even eliminated, thereby improving the brightness uniformity of the image and optimizing the display effect of the image.

[0039] In order to further illustrate the variation relationship between the uniformity influence angle and the numerical aperture angle of the optical engine 200 in different working states of the extended reality device 300, the inventor obtained the data shown in Table 1 through experiments.

[0040]

[0041] Table 1

[0042] Among them, 1 / β represents the ratio of the size of the image on the target surface 201 to the size of the displayed object in the display area AA. The aperture diameter of the optical engine represents the aperture diameter of the diaphragm in the optical engine. The object distance represents the distance between the display panel 100 and the optical engine 200, and the image distance represents the distance between the optical engine 200 and the target surface 201. When the extended reality device 300 is in different working states, the size of the display panel (for example, the size of the display panel in its thickness direction), the focal length of the optical engine, and the aperture diameter of the optical engine do not change.

[0043] As can be seen from Table 1, regardless of how the ratio of the size of the image on the target surface 201 to the size of the displayed object in the display area AA changes, the numerical aperture angle (usually also referred to as the light collection angle) of the optical engine 200 and the uniformity influence angle are positively correlated. That is, the smaller the numerical aperture angle of the optical engine 200, the smaller the uniformity influence angle. On the other hand, the larger the numerical aperture angle of the optical engine 200, the higher the optical coupling efficiency (hereinafter simply referred to as the optical engine efficiency) of the optical engine 200, that is, the higher the propagation efficiency of the optical engine 200 for light.

[0044] The extended reality device 300 usually further includes a diffractive optical waveguide on the side of the optical engine 200 away from the display panel 100. The optical engine 200 can couple the light emitted by the display panel 100 into the diffractive optical waveguide. When the light propagates in the diffractive optical waveguide, it will experience multiple reflections and diffractions, resulting in light energy loss, reducing the propagation efficiency of the light in the diffractive optical waveguide, and further reducing the brightness of the finally presented image. Based on this, the numerical aperture angle of the optical engine 200 is usually set to be relatively large. However, a larger numerical aperture angle will cause the uniformity influence angle to become larger, thereby exacerbating the difference in brightness between the edge position and the center position of the image.

[0045] Therefore, in this application, by setting the luminous efficiency of the second light-emitting device 12 to be greater than that of the first light-emitting device 11, the influence of the increased difference in brightness between the edge position and the center position of the image caused by the increase in the uniformity influence angle can be effectively compensated, thereby ensuring that the finally displayed image has good brightness uniformity.

[0046] On the other hand, the inventor conducted experiments on the influence of the light pattern of the light-emitting device on the ratio of the brightness of the edge position to the center position of the image observed on the target surface 201, and obtained the data shown in Table 2 and Figure 3 the relationship diagram of the normal angle and relative power of the light-emitting device shown.

[0047]

[0048] Table 2

[0049] Among them, the half - decay angle refers to the angle formed by opening around the central normal direction of the light - emitting device, corresponding to the angle when the light intensity decays from the central light intensity to half. The larger the half - decay angle, the more divergent the light pattern of the light - emitting device; conversely, the smaller the half - decay angle, the more convergent the light pattern of the light - emitting device. In addition, the first light - emitting device in the table is located at the geometric center of the display area, and the second light - emitting device is located at the edge of the display area. Moreover, the light emitted by the first light - emitting device finally projects to the central position of the image, while the light emitted by the second light - emitting device finally projects to the edge position of the image. The brightness ratio between the edge and the central position in the table is the brightness ratio between the edge position and the central position of the image.

[0050] It can be seen from Figure 3 that for a light - emitting device with a half - decay angle of ±15° or ±60°, the larger the normal angle (i.e., the angle between the light ray and the normal perpendicular to the light - emitting surface of the light - emitting device), the lower the relative power of the light - emitting device and the lower the luminous intensity of the light - emitting device. In addition, it can be seen from Table 2 that under the same light - engine efficiency, the ratio of the brightness of the upper - edge position to the central position of the finally observed image is less than 1. Therefore, the image shows the problem of uneven brightness. And the more convergent the light pattern of the light - emitting device, the smaller the ratio of the brightness of the upper - edge position to the central position of the finally observed image, and the more serious the problem of uneven brightness of the image.

[0051] Therefore, in the embodiments of the present application, by controlling the difference between the luminous efficiency of the second light - emitting device 12 and the luminous efficiency of the first light - emitting device 11, the display panel 100 using light - emitting devices with different light - emitting patterns can be correspondingly adjusted, so as to ensure that the finally displayed image has good brightness uniformity.

[0052] In some embodiments, as Figure 4A and Figure 4B shown, multiple first light - emitting devices 11 are connected in parallel with each other, and multiple second light - emitting devices 12 are connected in parallel with each other. Among them, the arrangement density of the second light - emitting devices 12 is different from the arrangement density of the first light - emitting devices 11, so that the luminous efficiency of the second light - emitting devices 12 is greater than the luminous efficiency of the first light - emitting devices 11.

[0053] Under the same current, as the arrangement density of the light - emitting device (such as the first light - emitting device 11 or the second light - emitting device 12) increases, its luminous efficiency also changes accordingly. By setting the arrangement density of the second light - emitting devices 12 to be different from the arrangement density of the first light - emitting devices 11, the luminous efficiency of the second light - emitting devices 12 can be made greater than the luminous efficiency of the first light - emitting devices 11, so as to effectively compensate for the difference in brightness between the position near the edge and the position near the center of the image caused by the existence of the uniformity - influencing angle, and further ensure that the finally displayed image has good brightness uniformity.

[0054] The inventor measured the corresponding relationship data of the density of the light-emitting devices (i.e., the number of light-emitting devices per unit area), the current density, and the relative efficiency of the light-emitting devices through experiments, as shown in Table 3. And, from the data in Table 3, the schematic diagrams of the change relationship curves of the current density with the density of the light-emitting devices and the current density with the relative efficiency of the light-emitting devices as shown in Figure 5 were obtained.

[0055]

[0056] Table 3

[0057] As shown in Figure 5 , when the number of light-emitting devices per unit area decreases from 50 to 3, the current density gradually decreases. And, when the number of light-emitting devices per unit area decreases from 50 to 20, the relative efficiency of the light-emitting devices increases as the density of the light-emitting devices decreases; when the number of light-emitting devices per unit area decreases from 20 to 3, the relative efficiency of the light-emitting devices decreases as the density of the light-emitting devices decreases.

[0058] In some embodiments, the arrangement density of the second light-emitting device 12 is greater than that of the first light-emitting device 11.

[0059] As an example, the number of the second light-emitting devices 12 per unit area is 20, while the number of the first light-emitting devices 11 per unit area is 7. This can increase the luminous efficiency of the second light-emitting device 12 by about 7% compared with that of the first light-emitting device 11, so as to effectively compensate for the difference in brightness between the position near the edge and the position near the center of the image caused by the existence of the uniformity influence angle, and then ensure that the finally displayed image has good brightness uniformity.

[0060] In addition, since the number of the second light-emitting devices 12 per unit area is more than that of the first light-emitting devices 11, it can also increase the luminous amount per unit area, thereby further increasing the brightness of the position near the center of the image, which is beneficial to achieving the balance of brightness between the position near the edge and the position near the center of the image under the condition of a relatively small density of the second light-emitting device 12, and then ensuring that the finally displayed image has good brightness uniformity.

[0061] In some embodiments, the arrangement density of the second light-emitting device 12 is less than that of the first light-emitting device 11. This can make the luminous efficiency of the second light-emitting device 12 greater than that of the first light-emitting device 11 through the difference in the arrangement density between the second light-emitting device 12 and the first light-emitting device 11, so as to effectively compensate for the difference in brightness between the position near the edge and the position near the center of the image caused by the existence of the uniformity influence angle, and then ensure that the finally displayed image has good brightness uniformity.

[0062] In some embodiments, as Figure 4A shown, the first light-emitting device 11 includes a first nano light-emitting diode 110. Since the first light-emitting device 11 includes the first nano light-emitting diode 110, the size of the first nano light-emitting diode 110 is less than 1 micron, for example, it can be greater than 0 and less than or equal to 0.5 micron. This can miniaturize the first light-emitting device 11, so as to meet the miniaturization requirements of the display panel 100 in the application of the extended reality device 300.

[0063] In some embodiments, as Figure 4B shown, the second light-emitting device 12 includes a second nano light-emitting diode 120. Since the second light-emitting device 12 includes the second nano light-emitting diode 120, the size of the second nano light-emitting diode 120 is less than 1 micron, for example, it can be greater than 0 and less than or equal to 0.5 micron. This can miniaturize the second light-emitting device 12, so as to meet the miniaturization requirements of the display panel 100 in the application of the extended reality device 300.

[0064] In some examples, the size of the first light-emitting device 11 and the size of the second light-emitting device 12 can be the same. For example, the sizes of both can be 0.2 microns.

[0065] In some embodiments, as Figure 4A and Figure 4B shown, both the first nano light-emitting diode 110 and the second nano light-emitting diode 120 include a first electrode 1011, a first semiconductor layer 1012, a light-emitting layer 1013, a second semiconductor layer 1014, and a second electrode 1015 that are sequentially stacked; wherein, the first electrodes 1011 in multiple first light-emitting devices 11 are connected to each other, and the second electrodes 1015 in the multiple first light-emitting devices 11 are connected to each other. The first electrodes 1011 in multiple second light-emitting devices 12 are connected to each other, and the second electrodes 1015 in the multiple second light-emitting devices 12 are connected to each other. As an example, for multiple first light-emitting devices 11 or multiple second light-emitting devices 12, the first electrode 1011 therein can be arranged as a whole layer, and the second electrode 1015 can also be arranged as a whole layer.

[0066] In this case, for multiple first light-emitting devices 11 or multiple second light-emitting devices 12, drive the corresponding electrode layers of the first electrode 1011 and the second electrode 1015 respectively, so as to drive the multiple first light-emitting devices 11 or multiple second light-emitting devices 12 to emit light.

[0067] In some examples, the first electrode 1011 can be a metal electrode, and the second electrode 1015 is a transparent electrode, which allows light to be emitted in the direction from the first electrode 1011 towards the second electrode 1015. As an example, the metal electrode can be made of materials such as silver and magnesium; the transparent electrode can be made of materials such as indium tin oxide and indium zinc oxide. The embodiments of the present application do not limit the specific material selection of the metal electrode and the transparent electrode.

[0068] In some examples, the material of the first semiconductor layer 1012 can be N-type GaN (gallium nitride); the light-emitting layer 1013 can be an InGaN / GaN (indium gallium nitride / gallium nitride) multiple quantum well layer (MQWs), for example, a 6-period InGaN / GaN multiple quantum well layer; the material of the second semiconductor layer 1014 can be P-type GaN.

[0069] For example, the thickness of the first semiconductor layer 1012 can be 300 nanometers, the thickness of the light-emitting layer 1013 can be 60 nanometers, and the thickness of the second semiconductor layer 1014 can be 150 nanometers.

[0070] In some examples, a capping layer 1016 is further provided on the second semiconductor layer 1014. The capping layer 1016 can protect the corresponding nano light-emitting diode. In addition, the capping layer 1016 can modulate light to achieve a better light-emitting effect. As an implementation manner, the material of the capping layer 1016 can be GaN. The thickness of the capping layer 1016 can be 150 nanometers.

[0071] As an example, during the fabrication of the first nano light-emitting diode 110 or the second nano light-emitting diode 120, a substrate can be provided first, and a stress buffer layer and an epitaxial base layer are sequentially formed on the substrate; then a mask layer is formed and patterned, and openings required for the growth of crystal seeds are etched; then GaN crystal seeds are grown in the openings, and epitaxial functional layers such as a light-emitting layer and a second semiconductor layer are grown on this basis. Among them, the stress buffer layer, the epitaxial base layer, and the mask layer can be fabricated by chemical vapor deposition. The material of the mask layer can be silicon nitride.

[0072] In some embodiments, as Figure 3 shown, a passivation layer 1017 is further provided between the first electrode 1011 and the second electrode 1015. The passivation layer 1017 surrounds the first semiconductor layer 1012, the light-emitting layer 1013, and the second semiconductor layer 1014 to effectively protect the nano light-emitting diode, thereby improving the stability of the nano light-emitting diode and ultimately enhancing the reliability of the display panel.

[0073] In some examples, the material of the passivation layer 1017 can be silicon oxide.

[0074] In some embodiments, such as Figure 1 shown, a plurality of spaced-apart first light-emitting units 101 are provided in the first sub-display area A1, and each first light-emitting unit 101 is composed of at least two first light-emitting devices 11; a plurality of spaced-apart second light-emitting units 102 are provided in the second sub-display area A2, and each second light-emitting unit 102 is composed of at least two second light-emitting devices 12. As an example, the size of the second light-emitting unit 102 is the same as that of the first light-emitting unit 101, and the number of second light-emitting devices 12 in the second light-emitting unit 102 is greater than the number of first light-emitting devices 11 in the first light-emitting unit 101. Figure 1 It is shown in

[0075] that the second light-emitting unit 102 is composed of nine second light-emitting devices 12, and the first light-emitting unit 101 is composed of four first light-emitting devices 11. However, the embodiments of the present application do not limit the number of light-emitting devices in the above light-emitting units and their arrangement relationship.

[0076] It should be noted that the second light-emitting unit 102 and the first light-emitting unit 101 can each be used as a sub-pixel, and this sub-pixel emits light of one color after being driven. By setting a plurality of sub-pixels that emit different colors, a pixel that can control the emission color can be formed, thereby realizing the color display of the display panel.

[0077] In some examples, the first light-emitting unit 101 and the second light-emitting unit 102 are arranged in an overall array in the display area AA.

[0078] In some embodiments, such as Figure 1 shown, the geometric center of the first sub-display area A1 coincides with the geometric center O of the display area AA. In this case, the first sub-display area A1 is the central display area of the display panel 100, and the second sub-display area A2 is the peripheral display area of the display panel 100. As an example, the edge area of the display area AA is located within this peripheral display area.

[0079] By setting like this, the luminous efficiency of the first light-emitting devices 11 in the first light-emitting unit 101 located at the geometric center O and the luminous efficiency of the second light-emitting devices 12 in the second light-emitting unit 102 located at the edge area of the display area AA can be controlled, so as to make the brightness of the central position of the finally observed image by the human eye consistent with the brightness of the edge position, and further realize a good image display effect.

[0080] In some embodiments, such as Figure 6As shown, the display area AA further includes a third sub-display area A3 surrounding the second sub-display area A2. The display panel 100 further includes a plurality of third light-emitting devices 13 located within the third sub-display area A3, and the luminous efficiency of the third light-emitting devices 13 is greater than that of the second light-emitting devices 12.

[0081] For the plurality of light-emitting devices on the display panel 100, as the distance between the light-emitting device and the geometric center O of the display area AA gradually increases, the brightness of the position where the light emitted by the light-emitting device finally projects onto the image also gradually decreases. By setting the luminous efficiency of the third light-emitting devices 13 to be greater than that of the second light-emitting devices 12, the brightness difference between two positions on the image at different distances from the center position can be compensated for by the difference in their luminous efficiencies, so that the brightness difference between the position near the edge and the position near the center of the finally formed image is reduced or even eliminated, thereby improving the brightness uniformity of the image and optimizing the display effect of the image.

[0082] In some embodiments, the plurality of third light-emitting devices 13 are connected in parallel to each other, and the arrangement density of the third light-emitting devices 13 is greater than that of the second light-emitting devices 12, so that the luminous efficiency of the third light-emitting devices 13 is greater than that of the second light-emitting devices 12.

[0083] When the arrangement density of the second light-emitting devices 12 is greater than that of the first light-emitting devices 11 so that the luminous efficiency of the second light-emitting devices 12 is greater than that of the first light-emitting devices 11, by controlling the arrangement density of the third light-emitting devices 13 to be greater than that of the second light-emitting devices 12, the arrangement density of the light-emitting devices gradually increases along the direction away from the geometric center O of the display area AA, so that the luminous amount in this direction changes uniformly, thereby ensuring the display uniformity of the display panel 100.

[0084] In some embodiments, the third light-emitting devices 13 include third nano light-emitting diodes. Since the third light-emitting devices 13 include third nano light-emitting diodes, the size of the third nano light-emitting diodes is less than 1 micron, for example, it can be greater than 0 and less than or equal to 0.5 micron. This can miniaturize the third light-emitting devices 13, thus meeting the miniaturization requirements of the display panel 100 in the application of the extended reality device 300.

[0085] In some examples, the size of the third light-emitting devices 13 can be the same as that of the second light-emitting devices 12. For example, the sizes of both can be 0.2 microns. In addition, the structure of the third light-emitting devices 13 can be set with reference to the structure of the first light-emitting devices 11 or the second light-emitting devices 12, which will not be elaborated here.

[0086] In some embodiments, please continue to refer to Figure 6, in the third sub-display area A3, a plurality of spaced-apart third light-emitting units 103 are provided, and each third light-emitting unit 103 is composed of at least two third light-emitting devices 13. As an example, the size of the third light-emitting unit 103 is the same as that of the first light-emitting unit 101, and the number of third light-emitting devices 13 in the third light-emitting unit 103 is greater than the number of second light-emitting devices 12 in the second light-emitting unit 102. Figure 6 It is shown in Figure 6 that the third light-emitting unit 103 is composed of nine third light-emitting devices 13, the second light-emitting unit 102 is composed of eight second light-emitting devices 12, and the first light-emitting unit 101 is composed of four first light-emitting devices 11. However, the embodiments of the present application do not limit the number of light-emitting devices and their arrangement relationships in the above-mentioned light-emitting units.

[0087] In some examples, the first light-emitting unit 101, the second light-emitting unit 102, and the third light-emitting unit 103 are arranged in an overall array in the display area AA.

[0088] Some embodiments of the present application also provide an extended reality device, such as Figure 2 as shown, the extended reality device 300 includes a display panel 100.

[0089] Since it includes the display panel 100, the extended reality device 300 has the technical effects of the above-mentioned display panel 100, which will not be elaborated here.

[0090] In some examples, the extended reality device 300 may be an AR device.

[0091] As an example, the extended reality device 300 further includes an optical engine 200, and the optical engine 200 can couple the light of the display panel 100 into a diffractive optical waveguide, so as to form an image observable by the human eye after being modulated by the diffractive optical waveguide.

[0092] The above has introduced the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A display panel, applied to an extended reality device, characterized in that: The display panel has a display area, the display area includes a first sub-display area and a second sub-display area surrounding the first sub-display area, the first sub-display area surrounds the geometric center of the display area, and the display panel includes: a plurality of first light emitting devices located in the first sub-display area; and a plurality of second light emitting devices located in the second sub-display area; Wherein, the luminous efficiency of the second light emitting device is greater than the luminous efficiency of the first light emitting device.

2. The display panel according to claim 1, characterized in that: A plurality of the first light-emitting devices are connected in parallel, and a plurality of the second light-emitting devices are connected in parallel, wherein an arrangement density of the second light-emitting devices is different from an arrangement density of the first light-emitting devices, so that a light-emitting efficiency of the second light-emitting devices is greater than a light-emitting efficiency of the first light-emitting devices.

3. The display panel according to claim 2, characterized in that: The arrangement density of the second light emitting devices is greater than the arrangement density of the first light emitting devices.

4. The display panel according to claim 2, characterized in that: The first light emitting device comprises a first nanometer light emitting diode, and / or The second light emitting device includes a second nano-light emitting diode.

5. The display panel according to claim 4, characterized in that: The first light emitting device comprises a first nano-light emitting diode, and the second light emitting device comprises a second nano-light emitting diode; The first nanometer light emitting diode and the second nanometer light emitting diode each include a first electrode, a first semiconductor layer, a light emitting layer, a second semiconductor layer and a second electrode which are sequentially stacked; The first electrodes in the plurality of first light emitting devices are connected to each other, and the second electrodes are connected to each other; and The first electrodes in a plurality of the second light emitting devices are connected to each other, and the second electrodes are connected to each other.

6. The display panel according to any one of claims 1 to 5, characterized in that: A plurality of mutually spaced first light-emitting units are arranged in the first sub-display area, and each first light-emitting unit is composed of at least two first light-emitting devices; A plurality of second light-emitting units spaced apart from each other are arranged in the second sub-display area, and each second light-emitting unit is composed of at least two second light-emitting devices; The arrangement density of the second light-emitting units is the same as the arrangement density of the first light-emitting units.

7. The display panel according to any one of claims 1 to 5, characterized in that: The geometric center of the first sub-display area coincides with the geometric center of the display area.

8. The display panel according to any one of claims 1 to 5, characterized in that: The display area further includes a third sub-display area surrounding the second sub-display area; The display panel further includes a plurality of third light emitting devices located in the third sub-display area, and light emitting efficiency of the third light emitting devices is greater than that of the second light emitting devices.

9. The display panel according to claim 8, characterized in that: A plurality of the third light emitting devices are connected in parallel, and an arrangement density of the third light emitting devices is greater than an arrangement density of the second light emitting devices, so that a light emitting efficiency of the third light emitting devices is greater than a light emitting efficiency of the second light emitting devices.

10. The display panel according to claim 9, characterized in that: The third light emitting device includes a third nano-light emitting diode.

11. An extended reality device, characterized in that: include: A display panel as claimed in any one of claims 1 to 10.

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