Display module and virtual reality equipment

Abstract

The invention discloses a display module and virtual reality equipment. The display module comprises a plurality of optical structures and a plurality of pixel units. The brightness of different display partitions is adjusted by arranging an optical structure in the display module, the brightness of an edge display partition is larger than that of a center display partition, and the brightness of the edge display partition which is further away from the center display partition is larger. Therefore, when the display module is used in the virtual reality equipment, the brightness variation trends of different display partitions in the display module can offset brightness attenuation caused by the vignetting phenomenon of the optical lens group, so that the uniformity of the in-eye brightness of the virtual reality equipment can be improved, the user experience can be improved, and visual fatigue can be avoided.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display module and a virtual reality device. Background Art

[0002] A display module is a module used to display images and text.

[0003] In a virtual reality (VR) device, a display module is used in conjunction with an optical lens group. Specifically, a light beam emitted by the display module is magnified by the optical lens group to be suitable for human eye recognition.

[0004] However, among the light beams emitted by the above-mentioned display module, part of the light near the edge is easily blocked by the components in the optical lens group, which can easily lead to poor uniformity of the image's brightness entering the eye, thereby affecting the user experience and easily causing visual fatigue. Summary of the invention

[0005] The embodiment of the present application provides a display module and a virtual reality device. The technical solution is as follows:

[0006] According to one aspect of the present application, a display module is provided, wherein the display module has a plurality of display partitions, wherein the plurality of display partitions include: a central display partition, and a plurality of edge display partitions surrounding the central display partition, wherein the plurality of edge display partitions are sequentially arranged in a direction away from the central display partition; the display module includes: a plurality of optical structures and a plurality of pixel units;

[0007] Each of the optical structures corresponds to at least one of the pixel units, and the orthographic projection of the optical structure on the display surface of the display module overlaps with the orthographic projection of the corresponding pixel unit on the display surface;

[0008] Among them, the structures of the optical structures distributed in the same display partition are the same, and the structures of the optical structures distributed in different display partitions are different, so that the brightness of the multiple edge display partitions is greater than the brightness of the central display partition, and for any two different edge display partitions, the brightness of the edge display partition closer to the central display partition is lower than the brightness of the edge display partition further away from the central display partition.

[0009] Optionally, the brightness of the plurality of edge display partitions increases sequentially in a direction away from the central display partition.

[0010] Optionally, the multiple optical structures are all plano-convex lenses, the multiple plano-convex lenses correspond to the multiple pixel units, the plano-convex lenses are located on the light-emitting side of the corresponding pixel units, and the plano-convex lenses bulge outwards on a side away from the corresponding pixel units;

[0011] Among them, the focal lengths of the plano-convex lenses distributed in the same display partition are the same, the focal length of the plano-convex lenses distributed in the central display partition is greater than the focal length of the plano-convex lenses distributed in the edge display partition, and for two adjacent edge display partitions, the focal length of the plano-convex lenses distributed in the edge display partition closer to the central display partition is greater than the focal length of the plano-convex lenses distributed in the edge display partition further away from the central display partition.

[0012] Optionally, the different plano-convex lenses have the same caliber, and the different plano-convex lenses are made of the same material;

[0013] Among them, the arch heights of the plano-convex lenses distributed in the same display partition are the same, the arch height of the plano-convex lenses distributed in the central display partition is smaller than the arch height of the plano-convex lenses distributed in the edge display partition, and for two adjacent edge display partitions, the arch height of the plano-convex lenses distributed in the edge display partition closer to the central display partition is smaller than the arch height of the plano-convex lenses distributed in the edge display partition further away from the central display partition.

[0014] Optionally, the refractive index of the material of the plano-convex lens is in the range of 1.4 to 1.8, and the arch height of the plano-convex lens is in the range of 0.01 mm to 0.1 mm.

[0015] Optionally, the multiple optical structures are all metalenses, the multiple metalenses correspond to the multiple pixel units, the metalenses are located at the light-emitting side of the corresponding pixel units, and the metalenses include: a plurality of micro-nano units arranged in an array;

[0016] Among them, the focal lengths of the metalenses distributed in the same display partition are the same, the focal length of the metalenses distributed in the central display partition is greater than the focal length of the metalenses distributed in the edge display partition, and for two adjacent edge display partitions, the focal length of the metalenses distributed in the edge display partition closer to the central display partition is greater than the focal length of the metalenses distributed in the edge display partition further away from the central display partition.

[0017] Optionally, the micro-nano units of the superlens are nanocolumns, the heights of the nanocolumns in the same superlens are the same, the radii of the nanocolumns in different superlenses are the same, the arrangement periods of the nanocolumns in different superlenses are the same, and the materials of the nanocolumns in different superlenses are the same;

[0018] Among them, the heights of the nanocolumns in the superlens distributed in the same display partition are the same, the height of the nanocolumns in the superlens distributed in the central display partition is less than the height of the nanocolumns in the superlens distributed in the edge display partition, and for two adjacent edge display partitions, the height of the nanocolumns in the superlens distributed in the edge display partition closer to the central display partition is less than the height of the nanocolumns in the superlens distributed in the edge display partition further away from the central display partition.

[0019] Optionally, in the same superlens, the distance between the axis lines of two adjacent nanocolumns ranges from 10 nanometers to 600 nanometers, and the height of the nanocolumns in the superlens ranges from 10 millimeters to 400 millimeters.

[0020] Optionally, the multiple optical structures are all reflective layers, the display module comprises: an edge-entry backlight source and a liquid crystal display panel, the edge-entry backlight source has a light guide plate, and the multiple reflective layers are all located on a side of the light guide plate away from the liquid crystal display panel;

[0021] Among them, the reflectivity of the reflective layers distributed in the same display partition is the same, the reflectivity of the reflective layer distributed in the central display partition is lower than the reflectivity of the reflective layer distributed in the edge display partition, and for two adjacent edge display partitions, the reflectivity of the reflective layer distributed in the edge display partition closer to the central display partition is lower than the reflectivity of the reflective layer distributed in the edge display partition further away from the central display partition.

[0022] Optionally, the reflective layer is a distributed Bragg reflector, the distributed Bragg reflector comprises: at least one pair of dimming layer groups stacked, the pair of dimming layer groups comprising a low refractive index layer and a high refractive index layer stacked, a plurality of distributed Bragg reflectors correspond one-to-one to the plurality of display partitions, the low refractive index layers in different distributed Bragg reflectors are made of the same material, and the high refractive index layers in different distributed Bragg reflectors are made of the same material;

[0023] Among them, the number of logarithms of dimming layer groups of distributed Bragg reflectors distributed in the central display partition is smaller than the number of logarithms of dimming layer groups of distributed Bragg reflectors distributed in the edge display partitions, and for two adjacent edge display partitions, the number of logarithms of dimming layer groups of distributed Bragg reflectors distributed in the edge display partition closer to the central display partition is smaller than the number of logarithms of dimming layer groups of distributed Bragg reflectors distributed in the edge display partition further away from the central display partition.

[0024] Optionally, the reflective layer is a distributed Bragg reflector, the distributed Bragg reflector comprises: at least one pair of dimming layer groups stacked, the pair of dimming layer groups comprising a low refractive index layer and a high refractive index layer stacked, a plurality of distributed Bragg reflectors correspond one-to-one to the plurality of edge display partitions, the low refractive index layers in different distributed Bragg reflectors are made of the same material, and the high refractive index layers in different distributed Bragg reflectors are made of the same material;

[0025] Among them, for two adjacent edge display partitions, the logarithm of dimming layer groups of distributed Bragg reflectors distributed in the edge display partition closer to the central display partition is smaller than the logarithm of dimming layer groups of distributed Bragg reflectors distributed in the edge display partition further away from the central display partition.

[0026] Optionally, the refractive index of the low refractive index layer is in the range of 1.2-1.8, and the refractive index of the high refractive index layer is in the range of 2-3.

[0027] On the other hand, a virtual reality device is provided, comprising: an optical lens group and a display module according to any one of the above claims, wherein the optical lens group is located at a light emitting side of the display module.

[0028] Optionally, the optical lens group has a plurality of sub-areas, and the plurality of sub-areas include: a central sub-area corresponding to the central display sub-area, and a plurality of edge sub-areas corresponding one-to-one to the plurality of edge display sub-areas;

[0029] Among them, the attenuation degree of the light brightness of the central sub-region is smaller than the attenuation degree of the light brightness of the edge sub-region, and for any two different edge sub-regions, the attenuation degree of the light brightness of the edge sub-region closer to the central sub-region is smaller than the attenuation degree of the light brightness of the edge sub-region further away from the central sub-region.

[0030] Optionally, the attenuation degree of the light brightness of the plurality of edge sub-regions increases sequentially in a direction away from the central sub-region.

[0031] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0032] The brightness of different display partitions is adjusted by setting an optical structure in the display module, wherein the brightness of the edge display partition is greater than the brightness of the center display partition, and the brightness of the edge display partition further away from the center display partition is greater. Therefore, when the display module is used in a virtual reality device, the brightness change trend of different display partitions in the display module can offset the brightness attenuation caused by the vignetting phenomenon of the optical lens group, thereby improving the uniformity of the eye brightness of the virtual reality device, thereby improving the user experience and avoiding visual fatigue. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a schematic diagram of a virtual reality device provided by the related art;

[0035] Figure 2 yes Figure 1 A comparison chart of brightness at different locations in the provided virtual reality device;

[0036] Figure 3 yes Figure 1 Brightness schematic diagram of the virtual reality device provided;

[0037] Figure 4 is a structural schematic diagram of a display module provided in an embodiment of the present application;

[0038] Figure 5 yes Figure 4 A schematic diagram of a cross-sectional structure of a display module is provided;

[0039] Figure 6 is a brightness principle diagram of a virtual reality device provided in an embodiment of the present application;

[0040] Figure 7 is a schematic diagram of the structure of another display module provided in an embodiment of the present application;

[0041] Figure 8 is a relationship diagram between the arch height and focal length of a plano-convex lens provided in an embodiment of the present application;

[0042] Fig. 9 is a schematic diagram of the structure of another display module provided in an embodiment of the present application;

[0043] Fig.10 is a schematic diagram of the structure of another display module provided in an embodiment of the present application;

[0044] Fig.11 yes Fig.10 An enlarged schematic diagram of some structures in the provided display module;

[0045] Fig.12 is an enlarged schematic diagram of a part of the structure in another display module provided in an embodiment of the present application;

[0046] Fig.13 This is a brightness diagram of a virtual reality device provided in an embodiment of the present application.

[0047] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0048] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0049] For the brightness distribution of virtual reality devices in related technologies, please refer to Figure 1 and Figure 2 , Figure 1 It is a schematic diagram of a virtual reality device provided by the related technology. Figure 2 yes Figure 1 A comparison chart of brightness at different positions in the provided virtual reality device. P1, P2, P3, P4, and P5 are the five positions for brightness testing, where the closer to the center, the greater the brightness, and the farther away from the center, the smaller the brightness, that is, the brightness uniformity of the virtual reality device provided by the related art is poor, which will affect the user experience and easily cause visual fatigue.

[0050] Virtual reality equipment includes: display module and optical lens group, then the brightness distribution of virtual reality equipment is based on the overall effect of the combination of display module and optical lens group. Figure 3 , Figure 3 yes Figure 1A brightness principle diagram of a virtual reality device is provided. Among them, for the display module, since the brightness uniformity of the display module is generally greater than 80%, that is, the brightness difference of multiple areas in the display module is small. For the optical lens group, the aperture stop will limit the size of the light beam passing through. The light farther away from the main optical axis is easier to be blocked, resulting in fewer light rays passing through the edge field of view and weaker light intensity, thereby forming an image that is blurred from the main optical axis to the direction away from the main optical axis, that is, the "vignetting" phenomenon. That is, from the center position to the edge position, the vignetting phenomenon of the optical lens group gradually increases the degree of brightness attenuation. It can be explained that the vignetting phenomenon of the optical lens group will cause the eye brightness of the virtual reality device to appear bright in the center and dark at the edges.

[0051] The present application embodiment provides a display module, please refer to Figure 4 and Figure 5 , Figure 4 is a structural schematic diagram of a display module provided in an embodiment of the present application, Figure 5 yes Figure 4 A cross-sectional structural diagram of a display module provided ( Figure 5 Can be Figure 4 The display module 10 is provided with a plurality of display partitions A, the plurality of display partitions A including: a central display partition A1, and a plurality of edge display partitions A2 surrounding the central display partition A1, the plurality of edge display partitions A2 being sequentially arranged in a direction away from the central display partition A1. Here, the display partitions of the display panel 10 may be areas for displaying images or texts, Figure 4 The number of the plurality of edge display partitions A2 shown is two, but the embodiment of the present application is not limited thereto, and the number of the plurality of edge display partitions A2 may also be greater than two, so as to achieve more precise control over the brightness of the display module 10 .

[0052] In the present application, the display module 10 may be: a liquid crystal display module (Liquid Crystal Display, LCD), or a micro light emitting diode display module (Micro Light Emitting Diode, Micro-LED), or a micro organic light emitting diode display module (Micro Organic Light Emitting Diode, Micro-OLED).

[0053] The display module 10 includes: a plurality of optical structures 11 and a plurality of pixel units 12. Here, the optical structure 11 is used to adjust the brightness of a plurality of display subareas A in the display module 10. For example, Figure 4The optical structure 11 shown can be a convex lens, which can be used for focusing light, but the embodiment of the present application is not limited thereto. The pixel unit 12 is a display unit in the display module 10. In order to make the pixel unit 12 display a specific color, the pixel unit 12 can include: a red sub-pixel, a blue sub-pixel and a green sub-pixel. Figure 4 Only two pixel units 12 in each display partition A are shown for example, but the embodiment of the present application does not limit the number of pixel units 12 in each display partition A.

[0054] Each optical structure 11 corresponds to at least one pixel unit 12, and the orthographic projection of the optical structure 11 on the display surface of the display module overlaps with the orthographic projection of the corresponding pixel unit 12 on the display surface. Here, one optical structure 11 can correspond to one pixel unit 12, and then one optical structure 11 can achieve the effect of regulating the brightness of the one pixel unit 12, so that the accuracy of brightness control can be improved. One optical structure 11 can also correspond to multiple pixel units 12, and then one optical structure 11 can achieve the effect of regulating the brightness of the multiple pixel units 12, so that the manufacturing difficulty can be reduced.

[0055] Among them, the structures of the optical structures 11 distributed in the same display partition A are the same, and the structures of the optical structures 11 distributed in different display partitions A are different, so that the brightness of multiple edge display partitions A2 is greater than the brightness of the central display partition A1, and for any two different edge display partitions A2, the brightness of the edge display partition A2 closer to the central display partition A1 is lower than the brightness of the edge display partition A2 further away from the central display partition A1.

[0056] Here, by setting optical structures 11 with different structures to control the brightness of each display partition A to be different, the brightness trend of different display partitions A in the display module 10 can be referred to Figure 6 , Figure 6 This is a brightness principle diagram of a virtual reality device provided by an embodiment of the present application. Among them, the brightness of the display partition A closer to the edge position is greater, which can offset the attenuation of the light brightness caused by the vignetting phenomenon of a part of the optical lens group, thereby improving the brightness uniformity of the light emitted by the display module 10 after passing through the optical lens group.

[0057] Optionally, refer to Figure 4 and Figure 6 , the brightness of the edge display partitions A2 increases in sequence in the direction away from the center display partition A1. In this way, the brightness variation trend of the edge display partitions A2 matches the brightness attenuation degree caused by the vignetting phenomenon of the optical lens group, thereby effectively improving the uniformity of the brightness entering the eye.

[0058] In summary, the embodiment of the present application provides a display module, which adjusts the brightness of different display partitions by setting an optical structure in the display module, wherein the brightness of the edge display partition is greater than the brightness of the center display partition, and the brightness of the edge display partition that is further away from the center display partition is greater. Therefore, when the display module is used in a virtual reality device, the brightness change trend of different display partitions in the display module can offset the brightness attenuation caused by the vignetting phenomenon of the optical lens group, thereby improving the uniformity of the eye brightness of the virtual reality device, and further improving the user experience and avoiding visual fatigue.

[0059] In the present application, the types of optical structures include various situations, and three exemplary embodiments are described below:

[0060] In the first exemplary embodiment, please refer to Figure 7 , Figure 7 It is a structural schematic diagram of another display module provided by an embodiment of the present application. Multiple optical structures 11 are all plano-convex lenses 11a, and multiple plano-convex lenses 11a correspond to multiple pixel units 12. The plano-convex lenses 11a are located on the light-emitting side of the corresponding pixel unit 12, and the side of the plano-convex lens 11a away from the corresponding pixel unit 12 bulges outward. Here, the side of the plano-convex lens 11a close to the pixel unit 12 is a plane, and the side of the plano-convex lens 11a away from the pixel unit 12 is a convex surface. In this way, the light emitted by the pixel unit 12 can be refracted through the plano-convex lens 11a, thereby achieving a focusing effect, and then the brightness of the forward light can be improved.

[0061] Among them, the focal lengths of the plano-convex lenses 11a distributed in the same display partition A are the same, the focal length of the plano-convex lens 11a distributed in the central display partition A1 is greater than the focal length of the plano-convex lens 11a distributed in the edge display partition A2, and for two adjacent edge display partitions A2, the focal length of the plano-convex lens 11a distributed in the edge display partition A2 closer to the central display partition A1 is greater than the focal length of the plano-convex lens 11a distributed in the edge display partition A2 further away from the central display partition A1.

[0062] Since the larger the focal length of the plano-convex lens 11a, the stronger the light-gathering ability of the plano-convex lens 11a. Therefore, by setting the focal lengths of the plano-convex lenses 11a in different display partitions to meet the above conditions, it can be achieved that the light-gathering ability of the plano-convex lenses 11a distributed in the display partition closer to the edge is stronger, so that the brightness of the edge display partition A2 is greater than the brightness of the center display partition A1, and the brightness of the edge display partition A2 that is further away from the center display partition A1 is greater.

[0063] According to the formula of the focal length of the plano-convex lens 11a and the formula of the curvature radius of the plano-convex lens 11a, the formula of the relationship between the focal length of the plano-convex lens 11a and various influencing factors can be obtained:

[0064] f = R / (n-1);

[0065] R=h1 / 2+D1^2 / 8h1;

[0066] f=(h1 / 2+D1*D1 / 8h1) / (n-1);

[0067] Among them, f is the focal length, R is the radius of curvature, n is the refractive index of the material, h1 is the arch height, and D1 is the aperture. That is, the focal length of the plano-convex lens 11a is related to the refractive index, arch height, and aperture of the material. Therefore, the embodiment of the present application can achieve the effect of adjusting the focal length of the plano-convex lens 11a by changing at least one of these three parameters.

[0068] In an exemplary embodiment, different plano-convex lenses 11a have the same caliber, and different plano-convex lenses 11a are made of the same material. Here, the number of pixel units 12 corresponding to different plano-convex lenses 11a may be the same. For example, multiple plano-convex lenses 11a correspond to multiple pixel units 12 one by one. Since the sizes of multiple pixel units 12 in the display module in the direction parallel to the display surface may be the same, by setting the caliber of the plano-convex lens 11a to be the same as the size of the pixel unit 12, the same caliber of different plano-convex lenses 11a can be achieved. In the embodiment of the present application, the plano-convex lens 11a is designed with the pixel unit 12 as the unit, which can achieve pixel-level dimming, thereby ensuring a certain degree of control precision. In addition, the problem of differences in sub-pixel size can be avoided, so as to facilitate the manufacture of multiple plano-convex lenses 11a with the same caliber. If the materials of different plano-convex lenses 11a are the same, the refractive index of different plano-convex lenses 11a is also the same, which can also facilitate the simultaneous manufacture of multiple plano-convex lenses 11a.

[0069] In this case, only the height of the arch is a variable, so the relationship between the height of the arch and the focal length of the plano-convex lens 11a can be obtained. Please refer to Figure 8 , Figure 8 is a relationship diagram between the arch height and focal length of a plano-convex lens provided in an embodiment of the present application, Figure 8 It can be seen that the greater the arch height of the plano-convex lens 11a, the smaller the focal length of the plano-convex lens 11a, that is, the focal length of the plano-convex lens 11a is negatively correlated with the arch height of the plano-convex lens 11a. In addition, the focal length of the plano-convex lens 11a and the arch height of the plano-convex lens 11a are not strictly linearly related. In the embodiment of the present application, the required focal length can be determined based on the brightness requirement, and then based on Figure 8 The arch height of each plano-convex lens 11a is accurately determined.

[0070] Among them, the arch heights H1 of the plano-convex lenses 11a distributed in the same display partition are the same, the arch height H1 of the plano-convex lens 11a distributed in the central display partition A1 is smaller than the arch height H1 of the plano-convex lens 11a distributed in the edge display partition A2, and for two adjacent edge display partitions A2, the arch height H1 of the plano-convex lens 11a distributed in the edge display partition A2 closer to the central display partition A1 is smaller than the arch height H1 of the plano-convex lens 11a distributed in the edge display partition A2 further away from the central display partition A1.

[0071] Optionally, the refractive index of the material of the plano-convex lens 11a ranges from 1.4 to 1.8, and the arch height of the plano-convex lens 11a ranges from 0.01 mm to 0.1 mm. Exemplarily, the plurality of plano-convex lenses 11a may be arranged in rows and columns, and in a row of plano-convex lenses 11a, the arch heights of the plano-convex lenses 11a distributed in different display partitions may gradually increase from 0.01 mm to 0.1 mm along a direction away from the central display partition A1.

[0072] In the second exemplary embodiment, please refer to Fig. 9 , Fig. 9 It is a structural schematic diagram of another display module provided by an embodiment of the present application. Multiple optical structures 11 are all super lenses 11b, and multiple super lenses 11b correspond to multiple pixel units 12. The super lenses 11b are located on the light-emitting side of the corresponding pixel units 12, and the super lenses 11b include: multiple array-arranged micro-nano units 111. Here, the multiple micro-nano units 111 in the super lens 11b can change the phase distribution of the incident light beam, so that it can be used to focus the light emitted by the pixel unit 12. The phase formula of the super lens 11b is:

[0073]

[0074] in, is the focusing phase of the superlens 11b, (x, y) is the position coordinate of the nanorod 111a, r is the radius of the nanorod 111a, λ in is the operating wavelength of the superlens 11b, and f is the focal length of the superlens 11b. The corresponding size of the nanocolumns 111a can be found, and the nanocolumns 111a can be arranged to form a circular superlens 11b, thereby realizing the focusing function.

[0075] Among them, the focal lengths of the superlens 11b distributed in the same display partition A are the same, the focal length of the superlens 11b distributed in the central display partition A1 is greater than the focal length of the superlens 11b distributed in the edge display partition A2, and for two adjacent edge display partitions A2, the focal length of the superlens 11b distributed in the edge display partition A2 closer to the central display partition A1 is greater than the focal length of the superlens 11b distributed in the edge display partition A2 further away from the central display partition A1.

[0076] Since the larger the focal length of the super lens 11b, the stronger the focusing ability of the super lens 11b, therefore, by setting the focal length of the super lens 11b in different display partitions to meet the above situation, it can be achieved that the focusing ability of the super lens 11b distributed in the display partition closer to the edge is stronger, so that the brightness of the edge display partition A2 can be greater than the brightness of the center display partition A1, and the brightness of the edge display partition A2 that is further away from the center display partition A1 is greater.

[0077] Optionally, the micro-nano unit 111 of the super lens 11b is a nano column 111a, and the focal length of the super lens 11b is related to the height h2 of the nano column 111a, the radius of the nano column 111a, the arrangement period of the nano column 111a, and the material of the nano column 111a. Therefore, the embodiment of the present application can achieve the effect of adjusting the focal length of the super lens 11b by changing at least one of these four parameters.

[0078] In an exemplary embodiment, the height h2 of each nanocolumn 111a in the same superlens 11b is the same, the radius of the nanocolumns 111a in different superlenses 11b is the same, the arrangement period of the nanocolumns 111a in different superlenses 11b is the same, and the material of the nanocolumns 111a in different superlenses 11b is the same. Here, by controlling other parameters to be the same, only the height h2 of the nanocolumn 111a is changed to adjust the focal length of each superlens 11b, so as to facilitate the manufacture of the superlens 11b. The larger the height h2 of the nanocolumn 111a, the longer it takes for light to pass through the nanocolumn 111a, thereby achieving a higher focusing effect.

[0079] In addition, the number of pixel units 12 corresponding to different super lenses 11b can be the same. For example, multiple super lenses 11b correspond one-to-one to multiple pixel units 12, so that pixel-level dimming can be achieved, thereby ensuring a certain degree of control precision.

[0080] Among them, the heights h2 of the nanocolumns 111a in the superlens 11b distributed in the same display partition A are the same, the height h2 of the nanocolumns 111a in the superlens 11b distributed in the central display partition A1 is smaller than the height h2 of the nanocolumns 111a in the superlens 11b distributed in the edge display partition A2, and for two adjacent edge display partitions A2, the height h2 of the nanocolumns 111a in the superlens 11b distributed in the edge display partition A2 closer to the central display partition A1 is smaller than the height h2 of the nanocolumns 111a in the superlens 11b distributed in the edge display partition A2 further away from the central display partition A1.

[0081] Optionally, in the same superlens 11b, the distance D2 between the axis lines of two adjacent nanocolumns 111a ranges from 10 nanometers to 600 nanometers, and the distance D2 can reflect the arrangement period of the nanocolumns 111a. The height h2 of the nanocolumns 111a in the superlens 11b ranges from 10 mm to 400 mm. Exemplarily, a plurality of superlenses 11b can be arranged in rows and columns, and in a row of superlenses 11b, along the direction away from the central display partition A1, the arch height of the plano-convex lenses 11a distributed in different display partitions can gradually increase from 10 mm to 400 mm. The materials of the superlens 11b may include, but are not limited to, titanium dioxide, silicon dioxide, and zirconium dioxide.

[0082] In the third exemplary embodiment, please refer to Fig.10 , Fig.10 It is a structural schematic diagram of another display module provided in an embodiment of the present application. The multiple optical structures 11 are all reflective layers 11c (Distributed Bragg Reflector, DBR), and the display module includes: an edge-entry backlight source 13 and a liquid crystal display panel 14, the edge-entry backlight source 13 has a light guide plate 131, and the multiple reflective layers 11c are all located on the side of the light guide plate 131 away from the liquid crystal display panel 14. In the edge-entry backlight source 13, the light emitted by the linear light source (such as a light-emitting diode) is irradiated into the light guide plate 131 from one side, and is scattered by conduction inside the light guide plate 131, thereby forming a surface light source. The reflective layer 11c can reflect the light on one side of the light guide plate 131, thereby enhancing the light output brightness of the display module.

[0083] Among them, the reflectivity of the reflective layer 11c distributed in the same display partition is the same, the reflectivity of the reflective layer 11c distributed in the central display partition A1 is lower than the reflectivity of the reflective layer 11c distributed in the edge display partition A2, and for two adjacent edge display partitions A2, the reflectivity of the reflective layer 11c distributed in the edge display partition A2 closer to the central display partition A1 is lower than the reflectivity of the reflective layer 11c distributed in the edge display partition A2 further away from the central display partition A1.

[0084] Since the greater the reflectivity of the reflective layer 11c, the stronger the effect of enhancing the light output brightness. Therefore, by setting the reflectivity of the reflective layer 11c in different display partitions to meet the above situation, it can be achieved that the reflective layer 11c distributed in the display partition closer to the edge has a stronger effect of enhancing the light output brightness, so that the brightness of the edge display partition A2 is greater than the brightness of the center display partition A1, and the brightness of the edge display partition A2 that is further away from the center display partition A1 is greater.

[0085] Optionally, the reflective layer 11c can be a distributed Bragg reflector mirror (DBR), and the reflective layer 11c includes: at least one pair of dimming layer groups 112 stacked, and the pair of dimming layer groups 112 includes a low refractive index layer N1 and a high refractive index layer N2 stacked. Here, the refractive index of the low refractive index layer N1 is less than the refractive index of the high refractive index layer N2. That is, the reflective layer 11c is a periodic structure in which two materials with different refractive indices are alternately stacked, and the optical thickness of each layer of material is 1 / 4 of the central reflection wavelength. Due to the difference in refractive index between the low refractive index layer N1 and the high refractive index layer N2, when light is emitted from the low refractive index layer N1 to the high refractive index layer N2, the reflected light will undergo a phase change at the interface. When the light enters the high refractive index layer N2, it will be reflected once on the upper and lower surfaces of each layer, and the reflected light of the two reflections will be in phase, superimposed and enhanced, thereby increasing the reflection coefficient of the reflective layer 11c. Therefore, the reflectivity of the distributed Bragg reflector 11c is related to the refractive index difference between the low refractive index layer N1 and the high refractive index layer N2, and is related to the logarithm of the dimming layer group 112. Therefore, the embodiment of the present application can achieve the effect of adjusting the reflectivity of the distributed Bragg reflector 11c by changing at least one of these two parameters.

[0086] In one embodiment, please refer to Fig.10 and Fig.11 , Fig.11 yes Fig.10 An enlarged schematic diagram of some structures in the display module is provided. Multiple distributed Bragg reflectors 11c correspond to multiple display partitions one by one, respectively, and the materials of the low refractive index layers N1 in different distributed Bragg reflectors 11c are the same, and the materials of the high refractive index layers N2 in different distributed Bragg reflectors 11c are the same. Here, by controlling other parameters to be the same, only the logarithm of the dimming layer group 112 is changed to adjust the reflectivity of each distributed Bragg reflector 11c, so as to facilitate the manufacture of the distributed Bragg reflector 11c. Since the more logarithms of the dimming layer group 112, the more times the light is reflected, a stronger brightness enhancement effect can be achieved.

[0087] Among them, the number of logarithms of dimming layer groups 112 of distributed Bragg reflectors 11c distributed in the central display partition A1 is smaller than the number of logarithms of dimming layer groups 112 of distributed Bragg reflectors 11c distributed in the edge display partition A2, and for two adjacent edge display partitions A2, the number of logarithms of dimming layer groups 112 of distributed Bragg reflectors 11c distributed in the edge display partition A2 closer to the central display partition A1 is smaller than the number of logarithms of dimming layer groups 112 of distributed Bragg reflectors 11c distributed in the edge display partition A2 further away from the central display partition A1.

[0088] In this embodiment, multiple distributed Bragg reflectors 11c are distributed in the central display partition A1 and the edge display partition A2, so the light output brightness of each display partition can be enhanced. The distributed Bragg reflectors 11c corresponding to the central display partition A1 can be rectangular, circular or elliptical, and the multiple distributed Bragg reflectors 11c corresponding to the multiple edge display partitions A2 can be annular, and the multiple distributed Bragg reflectors 11c are nested.

[0089] In another embodiment, please refer to Fig.10 and Fig.12 , Fig.12 It is an enlarged schematic diagram of a partial structure in another display module provided in an embodiment of the present application. A plurality of distributed Bragg reflectors 11c correspond one-to-one to a plurality of edge display partitions A2, and the materials of the low refractive index layers N1 in different distributed Bragg reflectors 11c are the same, and the materials of the high refractive index layers N2 in different distributed Bragg reflectors 11c are the same.

[0090] Among them, for two adjacent edge display partitions A2, the logarithm of the dimming layer group 112 of the distributed Bragg reflector 11c distributed in the edge display partition A2 closer to the center display partition A1 is smaller than the logarithm of the dimming layer group 112 of the distributed Bragg reflector 11c distributed in the edge display partition A2 further away from the center display partition A1.

[0091] In this embodiment, since the brightness of the central display partition A1 is not easily affected by the vignetting phenomenon, the multiple distributed Bragg reflectors 11c can be distributed only in the multiple edge display partitions A2, so the light output brightness of the multiple edge display partitions A2 can be enhanced, and the final light output brightness of the display module can also achieve a trend of low in the middle and high at the edges. The multiple distributed Bragg reflectors 11c can be ring-shaped, and the multiple distributed Bragg reflectors 11c are nested. Exemplarily, the edge of the multiple distributed Bragg reflectors 11c closest to the central display partition A1 can be 1 / 4 of the distance from the edge to the center of the display module.

[0092] Optionally, the refractive index of the low refractive index layer N1 ranges from 1.2 to 1.8, and the material of the low refractive index layer N1 may be silicon oxide (SiO), but is not limited thereto. The refractive index of the high refractive index layer N2 ranges from 2 to 3, and the material of the high refractive index layer N2 may be titanium dioxide (TiO2), but is not limited thereto.

[0093] For example, Fig.12 The four distributed Bragg reflectors 11c shown, along the direction away from the center display partition A1, the film layers in the four distributed Bragg reflectors 11c can be: two layers of SiO / TiO2, four layers of SiO / TiO2 / SiO / TiO2, six layers of SiO / TiO2 / SiO / TiO2 / SiO / TiO2 / SiO / TiO2, and eight layers of SiO / TiO2 / SiO / TiO2 / SiO / TiO2 / SiO / TiO2 / SiO / TiO2.

[0094] In the embodiment of the present application, the display module may further include: a processor, which may be used to process the image to be displayed so that the edge brightness of the processed image to be displayed is greater than the center brightness. In this way, a gradient change in brightness in the middle that is darker than the edge can be achieved at the source, without changing the structure of the display module, and only through algorithm processing, the same effect of improving the uniformity of eye brightness as in the above embodiment can be achieved.

[0095] In summary, the embodiment of the present application provides a display module, which adjusts the brightness of different display partitions by setting an optical structure in the display module, wherein the brightness of the edge display partition is greater than the brightness of the center display partition, and the brightness of the edge display partition that is further away from the center display partition is greater. Therefore, when the display module is used in a virtual reality device, the brightness change trend of different display partitions in the display module can offset the brightness attenuation caused by the vignetting phenomenon of the optical lens group, thereby improving the uniformity of the eye brightness of the virtual reality device, and further improving the user experience and avoiding visual fatigue.

[0096] On the other hand, the present application embodiment provides a virtual reality device, please refer to Fig.13 , Fig.13 1 is a brightness diagram of a virtual reality device provided in an embodiment of the present application. The virtual reality device 20 comprises: an optical lens group 21 and a display module 10 provided in any of the above embodiments, wherein the optical lens group 21 is located at the light-emitting side of the display module 10. The image displayed by the display module 10 is magnified by the optical lens group 21 and projected to the human eye, and the virtual image surface S1 is the image recognized by the human eye.

[0097] Optionally, the optical lens group has a plurality of sub-areas, including: a central sub-area corresponding to the central display partition, and a plurality of edge sub-areas corresponding one-to-one to the plurality of edge display partitions. The central sub-area can adjust the light emitted from the central display partition, and the edge sub-area can adjust the light emitted from the edge display partition.

[0098] The attenuation degree of the brightness of the light in the center sub-region is less than that in the edge sub-region, and for any two different edge sub-regions, the attenuation degree of the brightness of the light in the edge sub-region closer to the center sub-region is less than that in the edge sub-region farther from the center sub-region. In this way, the attenuation degree of the brightness of the light in the sub-region closer to the edge position in the optical lens group is greater, and since the brightness of the corresponding display partition in the display module is greater, the brightness uniformity of the light after passing through the optical lens group can be improved.

[0099] Optionally, the attenuation degree of the light brightness of the plurality of edge sub-regions increases in sequence in a direction away from the central sub-region. Figure 2 and Figure 3 The description of the vignetting situation can also prove that the edge sub-region that is further away from the central sub-region has a greater attenuation of the light brightness. Since the display module provided by the above embodiment improves the brightness of the corresponding edge display partition, the brightness change trend of the display module is opposite to the influence trend of the optical lens group on the brightness, so after the display module and the optical lens group cooperate, the effect of improving the uniformity of the eye brightness of the virtual reality device can be achieved.

[0100] In addition, after the design of the optical lens group 21 is completed, the vignetting condition of the optical lens group 21 is determined, and the brightness attenuation degree of each sub-area caused by the vignetting condition can be obtained through the optical design software, so that the brightness requirement corresponding to each display partition in the display module 10 can be determined, and then the brightness requirement can be achieved by adjusting the optical structure based on the above embodiment.

[0101] Exemplarily, when it is determined in the optical design software that the edge sub-area will cause the brightness of the light to decay to 80% of the brightness of the central display partition, the brightness of the corresponding edge display partition can be 125% of the brightness of the central display partition, so that the brightness of the light beam on the virtual image surface after passing through the edge sub-area can be 100%. In the direction from the center to the edge, when the brightness decay of each sub-area is 80%, 60% and 40% respectively, the brightness requirements of the corresponding edge display partition relative to the central display partition are 125%, 167% and 250% respectively. Further, when the optical structure is a plano-convex lens, the brightness of each display partition can be adjusted by adjusting the arch height of the plano-convex lens to meet the brightness requirement. Alternatively, when the optical structure is a super lens, the brightness of each display partition can be adjusted by adjusting the height of the nanocolumns in the super lens to meet the brightness requirement. Alternatively, when the optical structure is a distributed Bragg reflector, the brightness of each display partition can be adjusted by adjusting the logarithm of the dimming layer group in the distributed Bragg reflector to meet the brightness requirement.

[0102] In summary, the embodiment of the present application provides a virtual reality device, which adjusts the brightness of different display partitions by setting an optical structure in a display module, wherein the brightness of the edge display partition is greater than the brightness of the center display partition, and the brightness of the edge display partition that is further away from the center display partition is greater. Therefore, when the display module is used in a virtual reality device, the brightness change trend of different display partitions in the display module can offset the brightness attenuation caused by the vignetting phenomenon of the optical lens group, thereby improving the uniformity of the eye brightness of the virtual reality device, thereby improving the user experience and avoiding visual fatigue.

[0103] In this application, the term "at least one of A and B" is only a description of the association relationship of the associated objects, indicating that there can be three kinds of relationships. For example, at least one of A and B can be represented by: A exists alone, A and B exist at the same time, and B exists alone. Similarly, "at least one of A, B, and C" means that there can be seven kinds of relationships, which can be represented by: A exists alone, B exists alone, C exists alone, A and B exist at the same time, A and C exist at the same time, C and B exist at the same time, and A, B, and C exist at the same time. Similarly, "at least one of A, B, C, and D" means that there can be fifteen kinds of relationships, which can be represented by: A exists alone, B exists alone, C exists alone, D exists alone, A and B exist at the same time, A and C exist at the same time, A and D exist at the same time, C and B exist at the same time, D and B exist at the same time, C and D exist at the same time, A, B, and C exist at the same time, A, B, and D exist at the same time, A, C, and D exist at the same time, B, C, and D exist at the same time, and A, B, C, and D exist at the same time.

[0104] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0105] In the present application, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0106] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A display module, characterized in that: The display module has a plurality of display partitions, the plurality of display partitions include: a central display partition, and a plurality of edge display partitions surrounding the central display partition, the plurality of edge display partitions are sequentially arranged in a direction away from the central display partition; the display module includes: a plurality of optical structures and a plurality of pixel units; Each of the optical structures corresponds to at least one of the pixel units, and the orthographic projection of the optical structure on the display surface of the display module overlaps with the orthographic projection of the corresponding pixel unit on the display surface; Among them, the structures of the optical structures distributed in the same display partition are the same, and the structures of the optical structures distributed in different display partitions are different, so that the brightness of the multiple edge display partitions is greater than the brightness of the central display partition, and for any two different edge display partitions, the brightness of the edge display partition closer to the central display partition is lower than the brightness of the edge display partition further away from the central display partition.

2. The display module according to claim 1, characterized in that: The brightness of the plurality of edge display subareas increases sequentially in a direction away from the central display subarea.

3. The display module according to claim 2, characterized in that: The multiple optical structures are all plano-convex lenses, the multiple plano-convex lenses correspond to the multiple pixel units, the plano-convex lenses are located on the light-emitting side of the corresponding pixel units, and the plano-convex lenses bulge outwards on a side away from the corresponding pixel units; Among them, the focal lengths of the plano-convex lenses distributed in the same display partition are the same, the focal length of the plano-convex lenses distributed in the central display partition is greater than the focal length of the plano-convex lenses distributed in the edge display partition, and for two adjacent edge display partitions, the focal length of the plano-convex lenses distributed in the edge display partition closer to the central display partition is greater than the focal length of the plano-convex lenses distributed in the edge display partition further away from the central display partition.

4. The display module according to claim 3, characterized in that: The different plano-convex lenses have the same aperture and are made of the same material; Among them, the arch heights of the plano-convex lenses distributed in the same display partition are the same, the arch height of the plano-convex lenses distributed in the central display partition is smaller than the arch height of the plano-convex lenses distributed in the edge display partition, and for two adjacent edge display partitions, the arch height of the plano-convex lenses distributed in the edge display partition closer to the central display partition is smaller than the arch height of the plano-convex lenses distributed in the edge display partition further away from the central display partition.

5. The display module according to claim 4, characterized in that: The refractive index of the material of the plano-convex lens is in the range of: 1.4~1.8, the arch height of the plano-convex lens ranges from 0.01 mm to 0.1 mm.

6. The display module according to claim 2, characterized in that: The multiple optical structures are all super lenses, the multiple super lenses correspond to the multiple pixel units, the super lenses are located on the light-emitting side of the corresponding pixel units, and the super lenses include: multiple array-arranged micro-nano units; Among them, the focal lengths of the superlenses distributed in the same display partition are the same, the focal length of the superlenses distributed in the central display partition is greater than the focal length of the superlenses distributed in the edge display partition, and for two adjacent edge display partitions, the focal length of the superlenses distributed in the edge display partition closer to the central display partition is greater than the focal length of the superlenses distributed in the edge display partition further away from the central display partition.

7. The display module according to claim 6, characterized in that: The micro-nano units of the superlens are nanocolumns, the heights of the nanocolumns in the same superlens are the same, the radii of the nanocolumns in different superlenses are the same, the arrangement periods of the nanocolumns in different superlenses are the same, and the materials of the nanocolumns in different superlenses are the same; Among them, the heights of the nanocolumns in the superlens distributed in the same display partition are the same, the height of the nanocolumns in the superlens distributed in the central display partition is less than the height of the nanocolumns in the superlens distributed in the edge display partition, and for two adjacent edge display partitions, the height of the nanocolumns in the superlens distributed in the edge display partition closer to the central display partition is less than the height of the nanocolumns in the superlens distributed in the edge display partition further away from the central display partition.

8. The display module according to claim 7, characterized in that: In the same superlens, the distance between the axis lines of two adjacent nanocolumns ranges from 10 nanometers to 600 nanometers, and the height of the nanocolumns in the superlens ranges from 10 millimeters to 400 millimeters.

9. The display module according to claim 2, characterized in that: The multiple optical structures are all reflective layers, the display module comprises: an edge-entry backlight source and a liquid crystal display panel, the edge-entry backlight source has a light guide plate, and the multiple reflective layers are all located on a side of the light guide plate away from the liquid crystal display panel; Among them, the reflectivity of the reflective layers distributed in the same display partition is the same, the reflectivity of the reflective layer distributed in the central display partition is lower than the reflectivity of the reflective layer distributed in the edge display partition, and for two adjacent edge display partitions, the reflectivity of the reflective layer distributed in the edge display partition closer to the central display partition is lower than the reflectivity of the reflective layer distributed in the edge display partition further away from the central display partition.

10. The display module according to claim 9, characterized in that: The reflective layer is a distributed Bragg reflector, which includes: at least one pair of dimming layer groups stacked in layers, wherein the pair of dimming layer groups includes a low refractive index layer and a high refractive index layer stacked in layers, and the plurality of distributed Bragg reflectors correspond to the plurality of display partitions one by one, respectively, and the materials of the low refractive index layers in different distributed Bragg reflectors are the same, and the materials of the high refractive index layers in different distributed Bragg reflectors are the same; Among them, the number of logarithms of dimming layer groups of distributed Bragg reflectors distributed in the central display partition is smaller than the number of logarithms of dimming layer groups of distributed Bragg reflectors distributed in the edge display partitions, and for two adjacent edge display partitions, the number of logarithms of dimming layer groups of distributed Bragg reflectors distributed in the edge display partition closer to the central display partition is smaller than the number of logarithms of dimming layer groups of distributed Bragg reflectors distributed in the edge display partition further away from the central display partition.

11. The display module according to claim 9, characterized in that: The reflective layer is a distributed Bragg reflector, which includes: at least one pair of dimming layer groups stacked in layers, wherein the pair of dimming layer groups includes a low refractive index layer and a high refractive index layer stacked in layers, and the plurality of distributed Bragg reflectors correspond to the plurality of edge display partitions one by one, respectively, and the materials of the low refractive index layers in different distributed Bragg reflectors are the same, and the materials of the high refractive index layers in different distributed Bragg reflectors are the same; Among them, for two adjacent edge display partitions, the logarithm of dimming layer groups of distributed Bragg reflectors distributed in the edge display partition closer to the central display partition is smaller than the logarithm of dimming layer groups of distributed Bragg reflectors distributed in the edge display partition further away from the central display partition.

12. The display module according to any one of claims 9 to 11, characterized in that: The refractive index of the low refractive index layer is in the range of 1.2-1.8, and the refractive index of the high refractive index layer is in the range of 2-3.

13. A virtual reality device, characterized in that: The virtual reality device comprises: an optical lens group and a display module according to any one of claims 1 to 12, wherein the optical lens group is located on the light-emitting side of the display module.

14. The virtual reality device according to claim 13, characterized in that: The optical lens group has a plurality of sub-regions, and the plurality of sub-regions include: a central sub-region corresponding to the central display sub-region, and a plurality of edge sub-regions corresponding one by one to the plurality of edge display sub-regions; Among them, the attenuation degree of the light brightness of the central sub-region is smaller than the attenuation degree of the light brightness of the edge sub-region, and for any two different edge sub-regions, the attenuation degree of the light brightness of the edge sub-region closer to the central sub-region is smaller than the attenuation degree of the light brightness of the edge sub-region further away from the central sub-region.

15. The virtual reality device according to claim 14, characterized in that: The attenuation degree of the light brightness of the plurality of edge sub-regions increases sequentially in a direction away from the central sub-region.

Images