Micro-display and preparation method therefor, and display apparatus

Abstract

The present invention relates to the technical field of micro-displays. Disclosed are a micro-display and a preparation method therefor, and a display apparatus. The micro-display comprises a pixel layer, a transparent curved layer and a micro-lens array layer, wherein the transparent curved layer is arranged on a light-emergent side of the pixel layer; the side surface of the transparent curved layer facing away from the pixel layer is a curved surface; the curvature of the curved surface is configured to gradually increase from the center of the curved surface to an edge of the curved surface; the curved surface is located on the side of the transparent curved layer facing away from the pixel layer; and the micro-lens array layer is arranged on the curved surface. The technical solution of the present invention can ensure the display brightness of the micro-display and the uniformity of brightness display.

Description

Micro display screen, preparation method thereof and display device

[0001] This application claims priority to the Chinese patent application No.

[0002] 2024113552 10.2, entitled "Micro display screen, preparation method thereof and display device", filed on September 26, 2024 with the China Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of micro display screens, and in particular to a micro display screen, a preparation method thereof and a display device. BACKGROUND

[0004] In the related art, the core components of a near-eye display device include a micro display screen and an optical-mechanical imaging system. The micro display screen emits light rays through each sub-pixel in a pixel layer. The angle between the imaging light rays of the micro display screen and the normal of the plane where the pixel layer is located is the chief ray angle. The size of the chief ray angle affects how the light rays emitted by the micro display screen enter the optical-mechanical imaging system and are ultimately accepted by the human eye.

[0005] Currently, to ensure the display brightness and display uniformity of the micro display screen to adapt to the design requirements of the optical-mechanical imaging system, the chief ray angle of the micro display screen at different positions needs to gradually increase from the center of the screen to the edge. However, the existing micro display screen has the same light emission direction and brightness for each sub-pixel in the pixel layer, so that the chief ray angle of the micro display screen at different positions is the same, which makes it difficult for the micro display screen to match the requirements of the optical-mechanical imaging system for the chief ray angle, resulting in a situation that the brightness of the micro display screen gradually decreases from the center of the screen to the edge. SUMMARY

[0006] The main purpose of the present application is to provide a micro display screen, a preparation method thereof and a display device, aiming to ensure the display brightness and display uniformity of the micro display screen.

[0007] To achieve the above-mentioned purpose, the micro display screen provided by the present application comprises:

[0008] a pixel layer;

[0009] a transparent curved surface layer, the transparent curved surface layer is arranged on the light emission side of the pixel layer, the side surface of the transparent curved surface layer away from the pixel layer is a curved surface, and the curvature of the curved surface increases from the center of the curved surface to the edge of the curved surface; and

[0010] a microlens array layer, the microlens array layer is arranged on the curved surface.

[0011] In an embodiment, the microlens array layer comprises:

[0012] a support layer, which is deformable and configured to be attached to the curved surface; and

[0013] a microlens array, which comprises a plurality of microlens structures arranged in an array on a side of the support layer opposite to the transparent curved surface layer.

[0014] In an embodiment, the microlens array and the support layer have the same refractive index, and the transparent curved surface layer and the support layer have the same refractive index.

[0015] In an embodiment, the microlens array layer further comprises a color filter layer, which comprises a plurality of color filter structures, each of which is disposed between a microlens structure and the support layer.

[0016] In an embodiment, the microlens structure is made of a color filter material.

[0017] In an embodiment, the micro display screen further comprises a planarization layer disposed on a side of the microlens array layer opposite to the transparent curved surface layer, the planarization layer having a refractive index smaller than that of the microlens structure.

[0018] In an embodiment, the microlens array layer comprises a plurality of microlens structures, each of which corresponds to each sub-pixel of the pixel layer.

[0019] To achieve the above object, the present application provides a method for manufacturing a micro display screen, which comprises the following steps:

[0020] manufacturing a transparent curved surface layer, one side surface of which is a curved surface, the curvature of which increases from the center of the curved surface to the edge of the curved surface;

[0021] manufacturing a microlens array layer, and transferring the microlens array layer to the curved surface of the transparent curved surface layer.

[0022] In an embodiment, the step of manufacturing the microlens array layer comprises:

[0023] providing a mask;

[0024] injecting raw materials of the microlens array into the mask, and solidifying to form the microlens array;

[0025] injecting raw materials of the support layer into the mask, and solidifying on the microlens array to form the support layer, so as to obtain the microlens array layer;

[0026] separating the mask from the microlens array layer.

[0027] In an embodiment, before the step of injecting a raw material of a support layer into the mask and solidifying on the microlens array to form a microlens array layer, the method further comprises:

[0028] injecting a raw material of a color filter into the mask and solidifying on the microlens array to form a filter layer.

[0029] In an embodiment, the step of transferring the microlens array layer to the curved surface of the transparent curved layer comprises:

[0030] applying an adhesive on the curved surface of the transparent curved layer;

[0031] adhering the microlens array layer to the curved surface of the transparent curved layer.

[0032] The present application also provides a display device comprising the micro display screen of any one of the preceding embodiments.

[0033] The technical solution of the present application can make each microlens structure in the microlens array layer deflect according to the curvature of the curved surface, at this time, the light emitted by each sub-pixel in the pixel layer of the micro display screen can be transmitted to each microlens structure, and the propagation direction of the light can be deflected by the microlens structure, so that the angle between the light and the normal of the plane where the pixel layer of the micro display screen is located can meet the required chief ray angle of the optical-mechanical imaging system, thereby improving the eye entrance luminance and the uniformity of the luminance display of the micro display screen. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in the drawings without creative labor.

[0035] Fig. 1 is a structural schematic diagram of a first embodiment of the micro display screen of the present application;

[0036] Fig. 2 is a partial structural schematic diagram of Fig. 1;

[0037] Fig. 3 is a partial structural schematic diagram of a second embodiment of the micro display screen of the present application;

[0038] Fig. 4 is a partial structural schematic diagram of a third embodiment of the micro display screen of the present application;

[0039] Fig. 5 is a partial structural schematic diagram of a fourth embodiment of the micro display screen of the present application;

[0040] Fig. 6 is a flow chart of a first embodiment of the method for manufacturing the micro display screen according to the present application;

[0041] Fig. 7 is a partial flow chart of Fig. 6;

[0042] Fig. 8 is a flow chart of a second embodiment of the method for manufacturing the micro display screen according to the present application;

[0043] Fig. 9 is a structural schematic diagram of a partial manufacturing process of Fig. 8;

[0044] Brief Description of the Drawings: 1000, micro display screen; 10, transparent curved surface layer; 20, microlens array layer; 21, support layer; 22, microlens array; 22a, microlens structure; 23, filter layer; 23a, color filter structure; 30, planarization layer; 200, base layer; 300, pixel layer; 310, sub-pixel; 400, encapsulation layer.

[0045] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0048] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0049] In the related art, the core components of the near-eye display device include a micro display screen and an optical-mechanical imaging system. The micro display screen emits light rays through each sub-pixel in the pixel layer. The angle between the imaging light ray of the micro display screen and the normal of the plane where the pixel layer is located is the chief ray angle. The size of the chief ray angle affects how the light rays emitted by the micro display screen enter the optical-mechanical imaging system and are ultimately accepted by the human eye.

[0050] Currently, in order to ensure the display brightness and display uniformity of the micro display screen to adapt to the design requirements of the optical-mechanical imaging system, the chief ray angle of the micro display screen at different positions needs to gradually increase from the center of the screen to the edge. However, the existing micro display screen usually has the same light emission direction and brightness for each sub-pixel in the pixel layer, so that the chief ray angle of the micro display screen at different positions is the same, thereby making it difficult for the micro display screen to match the requirements of the optical-mechanical imaging system for the chief ray angle, resulting in a situation that the brightness of the micro display screen gradually decreases from the center of the screen to the edge.

[0051] The present application provides a micro display screen 1000 applied to a display device.

[0052] Please refer to FIG. 1 to FIG. 5, in an embodiment of the present application, the micro display screen 1000 comprises:

[0053] a pixel layer 300;

[0054] a transparent curved surface layer 10, the transparent curved surface layer 10 is arranged on the light emitting side of the pixel layer 300, the surface of the side of the transparent curved surface layer 10 away from the pixel layer 300 is a curved surface, the curvature of the curved surface increases from the center of the curved surface to the edge of the curved surface, and the curved surface is located on the side of the transparent curved surface layer 10 away from the pixel layer 300; and

[0055] a microlens array layer 20, the microlens array layer 20 is arranged on the curved surface.

[0056] The transparent curved surface layer 10 and the microlens array layer 20 can be arranged to be transparent, the sub-pixels 310 in the pixel layer 300 of the micro display screen 1000 can be used to emit light, and the light can be transmitted outwards through the packaging layer 400 of the micro display screen 1000 to sequentially pass through the transparent curved surface layer 10 and the microlens array 22 in the microlens array layer 20. Specifically, the microlens array 22 is composed of a plurality of array-arranged microlens structures 22a. In some embodiments, the curved surface of the transparent curved surface layer 10 can be arranged as a concave surface that is recessed in the direction towards the pixel layer 100 or a convex surface that is convex in the direction away from the pixel layer 100; the microlens array 22 can be arranged as a regular array, that is, the size, topography and spacing of each microlens structure 22a are the same; the microlens array 22 can also be an irregular array, that is, the size, topography and spacing of adjacent microlenses are different. In this way, the specific array scheme of the microlens structure 22a can be fine-tuned according to the actual design requirements, which is beneficial to ensure the adjustment effect of the microlens array layer 20 on the direction of light propagation.

[0057] The technical scheme of the present application can gradually increase the curvature of the curved surface of the transparent curved surface layer 10 from the center to the edge, and arrange the microlens array layer 20 on the curved surface. In this way, each microlens structure 22a in the microlens array layer 20 can deflect according to the curvature of the curved surface. At this time, the light emitted by each sub-pixel 310 in the pixel layer 300 of the micro display screen 1000 can be transmitted to each microlens structure 22a, and the direction of propagation of the light can be deflected by the microlens structure 22a. In this way, the angle between the light and the normal of the plane of the pixel layer 300 of the micro display screen 1000 can meet the required chief ray angle of the optical-mechanical imaging system, thereby improving the eye entrance luminance of the micro display screen 1000 and the uniformity of the luminance display.

[0058] Please refer to FIGS. 1-5. In the embodiments of the present application, the microlens array layer 20 includes:

[0059] The support layer 21 can be deformed and arranged to adhere to the curved surface; and

[0060] The microlens array 22 includes a plurality of microlens structures 22a, and the plurality of microlens structures 22a are array-arranged on the side of the support layer 21 away from the transparent curved surface layer 10.

[0061] The material of the support layer 21 can be arranged to have a certain flexibility, so that it can be stretched or compressed to a certain extent. In this way, when the support layer 21 is adhered to the curved surface of the transparent curved surface layer 10, it can change its topography according to the profile of the curved surface, so that the support layer 21 can be well fitted with the curved surface, which is beneficial to improve the stability of the combination between the microlens array layer 20 and the transparent curved surface layer 10.

[0062] In some embodiments, the support layer 21 itself can have certain viscosity to be directly attached to the curved surface of the transparent curved layer 10; the support layer 21 can also be attached to the curved surface of the transparent curved layer 10 through an adhesive to ensure the connection strength between the microlens array layer 20 and the transparent curved layer 10. The specific implementation can be set according to actual needs, which is not limited herein.

[0063] In the embodiments of the present application, the refractive index of the microlens array 22 and the support layer 21 is the same, and the refractive index of the transparent curved layer 10 and the support layer 21 is the same.

[0064] It can be understood that, by making the refractive index of the microlens array 22 and the support layer 21 the same or similar, the curved surface of the transparent curved layer 10 can only be used to control the mounting orientation of the microlens structure 22a arranged on the curved surface by limiting the curvature of the curved surface, and the existence of the curved surface itself does not change the light transmission direction, thereby making the light transmission direction unchanged when the light is transmitted from the transparent curved layer 10 to the support layer 21, facilitating the optical path design of the micro display screen 1000.

[0065] In some embodiments, the micro display screen 1000 can be set as a silicon-based OLED full-color device, and a color filter is not required to realize full-color display, at this time, the transparent curved layer 10 and the microlens array layer 20 in the foregoing embodiments can be directly arranged on the surface of the packaging layer 400 of the micro display screen 1000.

[0066] In some embodiments, the micro display screen 1000 further comprises a filter layer 23, the filter layer 23 is arranged between the pixel layer 300 and the transparent curved layer 10, and the filter layer 23 comprises a plurality of color filter structures 23a, each color filter structure 23a is arranged corresponding to each sub-pixel 310 of the pixel layer 300.

[0067] Specifically, the micro display screen 1000 can be set as a WOLED device, the sub-pixel 310 of the pixel layer 300 of the micro display screen 1000 is used to emit white light, the surface of the packaging layer 400 of the micro display screen 1000 can be provided with the filter layer 23, the filter layer 23 is used to arrange the color filter structure 23a composed of color filters corresponding to each sub-pixel 310 to realize the emission of light of different colors, and the transparent curved layer 10 and the microlens array layer 20 in the foregoing embodiments can be arranged on the light-emitting side of the filter layer 23.

[0068] It should be noted that, for the technical solution that the filter layer 23 can be arranged on the surface of the packaging layer 400 of the micro display screen 1000, after the light emitted by the sub-pixel 310 passes through the filter layer 23, it still needs to pass through the transparent curved layer 10 and the support layer 21 in sequence before being transmitted to the microlens structure 22a, the distance between the filter layer 23 and the microlens structure 22a is large, which may cause the light collected by the microlens structure 22a to have problems such as color mixing.

[0069] Of course, the technical solutions of the present application are not limited to this, in some embodiments, the surface of the encapsulation layer 400 of the WOLED device can not be provided with the filter layer 23, and correspondingly, the color filter structure 23a can be correspondingly increased in the microlens array layer 20 of the micro display screen 1000 as described in the following embodiments, thereby realizing the color filtering function, which will not be described here.

[0070] Specifically, referring to FIG. 3, in the embodiments of the present application, the microlens array layer 20 further comprises a filter layer 23, and the filter layer 23 comprises a plurality of color filter structures 23a, each color filter structure 23a being arranged between a microlens structure 22a and a support layer 21.

[0071] In the present embodiment, by arranging the filter layer 23 between the microlens structure 22a and the support layer 21, the light emitted by the sub-pixel 310 can be directly transmitted to the microlens structure 22a after passing through the color filter structure. Such an arrangement is beneficial to reducing the distance between the color filter structure 23a and the microlens structure 22a, and is beneficial to reducing the risk of color bleeding of the light collected by the microlens structure 22a, thereby ensuring the display effect of the micro display screen 1000.

[0072] Of course, the technical solutions of the present application are not limited to this, referring to FIG. 4, in the embodiments of the present application, the microlens structure 22a is composed of a color filter material.

[0073] It can be understood that directly preparing the microlens structure 22a based on the color filter material can make the microlens structure 22a have the functions of color filtering by the filter and light direction control by the lens, which can reduce the risk of color bleeding of the light collected by the microlens structure 22a on the one hand, and can avoid setting the filter layer 23 on the other hand, thereby reducing the devices of the micro display screen 1000 and being beneficial to improving the structural compactness of the micro display screen 1000.

[0074] Referring to FIGS. 1 to 5, in the embodiments of the present application, the micro display screen 1000 further comprises a planarization layer 30, the planarization layer 30 being arranged on the side of the microlens array layer 20 away from the transparent curved surface layer 10, and the refractive index of the planarization layer 30 being less than the refractive index of the microlens structure 22a.

[0075] It can be understood that by arranging the planarization layer 30, on the one hand, the planarization effect can be achieved, and on the other hand, the microlens array layer 20 of the foregoing embodiments can be protected and fixed.

[0076] Further, by making the refractive index of the planarization layer 30 less than the refractive index of the microlens structure 22a, the converging effect of the microlens structure 22a on the light rays is facilitated, so that the microlens array layer 20 modulates the transmission direction of the light rays, and the angle between the imaging light rays of the micro display screen 1000 and the normal of the plane where the pixel layer 300 of the micro display screen 1000 is located can meet the required chief ray angle of the optical-mechanical imaging system.

[0077] Referring to FIGS. 1-5, in an embodiment of the present application, the microlens array layer 20 includes a plurality of microlens structures 22a, each of which is arranged one-to-one with each sub-pixel 310 of the pixel layer 300.

[0078] In this way, the micro display screen 1000 can control the propagation direction of light at the sub-pixel 310 level, ensuring the eye entrance brightness and brightness display uniformity of the micro display screen 1000. Of course, the technical solution of the present application is not limited to this, and in some embodiments, the microlens structure 22a and the sub-pixel 310 can also be arranged one-to-many or many-to-one, which is not limited herein.

[0079] In view of the technical problems mentioned in the background, the present application also provides a preparation method of a micro display screen 1000, aiming to ensure the display brightness and display uniformity of the micro display screen 1000.

[0080] The preparation method of the micro display screen 1000 provided by the present application will be described below in specific embodiments:

[0081] As shown in FIG. 6, it is the first embodiment of the preparation method of the shell structure of the present application. In this embodiment, the preparation method of the micro display screen 1000 includes the following steps:

[0082] Step S10, preparing a transparent curved surface layer 10, one side surface of the transparent curved surface layer 10 is a curved surface, and the curvature of the curved surface increases from the center of the curved surface to the edge of the curved surface;

[0083] Among them, the transparent curved surface layer 10 can be prepared by nano-imprinting process or injection molding process, and the material of the transparent curved surface layer 10 can be set as a light-transmitting material with a refractive index close to or the same as that of the microlens array layer 20.

[0084] It can be understood that by setting one side surface of the transparent curved surface layer 10 as a curved surface and increasing the curvature of the curved surface from the center of the curved surface to the edge of the curved surface, the angle between the tangent of different directions on the curved surface and the normal of the pixel layer 300 of the micro display screen 1000 can meet or approach the required chief ray angle of the optical-mechanical imaging system, thereby facilitating the guarantee of the display brightness and display uniformity of the micro display screen 1000.

[0085] Step S20, a microlens array layer 20 is prepared, and the microlens array layer 20 is transferred to the curved surface of the transparent curved layer 10.

[0086] The microlens array layer 20 can be prepared by a nanoimprint process, and the microlens array layer 20 includes a support layer 21 and a microlens array 22 arranged on the support layer 21. The microlens array 22 includes a plurality of arrayed microlens structures 22a. Specifically, the support layer 21 and the microlens array 22 arranged on the support layer 21 can be made of PDMS, PMMA, epoxy resin or other heat-curable or ultraviolet-curable materials. Alternatively, the support layer 21 can be made of PDMS, PMMA, epoxy resin or other heat-curable or ultraviolet-curable materials, and the microlens array 22 can be made of a color filter material as described in the foregoing embodiments, so that the microlens structures 22a can filter colors and control light directions.

[0087] After the microlens array layer 20 is prepared, the microlens array layer 20 can be combined with the transparent curved layer 10 by attaching the microlens array layer 20 to the curved surface of the transparent curved layer 10. Then, the combined structure of the microlens array layer 20 and the transparent curved layer 10 is transferred to the surface of the packaging layer 400 of the corresponding display device, so that the micro display screen 1000 is prepared.

[0088] Referring to FIG. 7, in the embodiments of the present application, the step S20, i.e., the step of preparing the microlens array layer 20, further includes the following steps:

[0089] Step S21, a mask is provided;

[0090] The mask includes specially designed grooves, and the grooves are provided with a barrier layer. The barrier layer can block a plurality of recesses in the grooves and prevent the recesses from penetrating each other. The recesses are arrayed, and the shape of the recesses is matched with the outer contour of the microlens structures 22a.

[0091] Step S22, the raw material of the microlens array 22 is injected into the mask, and the microlens array 22 is formed by solidification;

[0092] The raw material of the microlens array 22 can be PDMS, PMMA, epoxy resin or other heat-curable or ultraviolet-curable materials, or a color filter material. In this way, the microlens structures 22a can filter colors and control light directions.

[0093] Specifically, the step of injecting the material of the microlens array 22 into the mask can be realized by the process of inkjet printing. After the material of the microlens array 22 is injected, the material of the microlens array 22 can be preliminarily solidified by thermal curing or photocuring to form a microlens structure 22a in each recess of the groove of the mask.

[0094] In step S23, the material of the support layer 21 is injected into the mask, and the support layer 21 is formed by solidification on the microlens array 22 to obtain the microlens array layer 20.

[0095] The material of the support layer 21 can be, but is not limited to, PDMS, PMMA, epoxy resin, and other heat-curable or ultraviolet-curable materials. The support layer 21 is obtained by solidification on the microlens array 22, and thus the microlens array layer 20 is prepared. Since the material of the support layer 21 has flexible properties, the prepared support layer 21 can be deformed to a certain extent, so that it can be well attached to the curved surface of the transparent curved surface layer 10 when combined with the curved surface of the transparent curved surface layer 10 in the subsequent process, and thus the microlens array 22 can adjust its setting direction according to the curvature of the curved surface.

[0096] Specifically, the step of injecting the material of the support layer 21 into the mask can be realized by the process of inkjet printing or by the method of spin coating, which is not limited herein. After the material of the support layer 21 is injected, it can be preliminarily solidified to obtain the support layer 21 on the microlens array 22.

[0097] In step S24, the mask and the microlens array layer 20 are separated.

[0098] By peeling off the microlens array layer 20 from the mask, the microlens array layer 20 with the support layer 21 at the bottom and the microlens array 22 arranged thereon is obtained. In this way, the microlens array layer 20 can be easily attached to the curved surface of the transparent curved surface layer 10 with the support layer 21 at the bottom, so that the microlens array layer 20 is combined with the transparent curved surface layer 10. Then, the combined structure of the microlens array layer 20 and the transparent curved surface layer 10 is transferred to the surface of the packaging layer 400 of the corresponding display device, and thus the micro display screen 1000 is prepared.

[0099] Further, referring to FIG. 7, in the embodiment of the present application, the aforementioned step S20, i.e., the step of transferring the microlens array layer 20 to the curved surface of the transparent curved surface layer 10, further includes:

[0100] In step S25, an adhesive is coated on the curved surface of the transparent curved surface layer 10.

[0101] The adhesive can be, but is not limited to, transparent glue, ultraviolet glue, and thermoplastic glue.

[0102] Step S26, adhering the microlens array layer 20 to the curved surface of the transparent curved surface layer 10.

[0103] It can be understood that, compared with directly adhering the support layer 21 to the curved surface of the transparent curved surface layer 10 by the adhesion of the support layer 21 itself, the embodiment first coats an adhesive on the curved surface of the transparent curved surface layer 10, and then adheres and fixes the support layer 21 of the microlens array layer 20 through the adhesive, which is conducive to ensuring the connection strength between the microlens array layer 20 and the transparent curved surface layer 10, so as to improve the structural stability of the prepared micro display screen 1000.

[0104] Further, in the embodiment of the present application, after the aforementioned step S20, i.e., the step of "transferring the microlens array layer 20 to the curved surface of the transparent curved surface layer 10", the method further comprises:

[0105] A planarization layer 30 is prepared on the side of the microlens array layer 20 away from the transparent curved surface layer 10.

[0106] The planarization layer 30 can be prepared by spin coating, flow leveling, etc. By preparing the planarization layer 30, the planarization effect can be achieved, and the protection and fixation of the plastic microlens array layer 20 can be achieved.

[0107] Specifically, the material of the planarization layer 30 is a light-transmissive material, and the refractive index thereof is less than the refractive index of the microlens structure 22a, which is conducive to realizing the converging effect of the microlens structure 22a on light, so as to modulate the transmission direction of light by the microlens array layer 20, so that the angle between the imaging light of the micro display screen 1000 and the normal of the plane where the pixel layer 300 of the micro display screen 1000 is located can meet the required chief ray angle of the optical-mechanical imaging system.

[0108] As shown in FIG. 8, it is a part of the flow chart of the second embodiment of the preparation method of the micro display screen 1000 of the present application. The difference between the first embodiment and the second embodiment is that, before the step S23 in the first embodiment, i.e., the step of "injecting the raw material of the support layer 21 into the mask, and solidifying to form the support layer 21 on the microlens array 22 to obtain the microlens array layer 20", the method further comprises:

[0109] Step S27, injecting the raw material of the color filter into the mask, and solidifying to form the filter layer 23 on the microlens array 22.

[0110] In some embodiments, the raw material of the color filter can include a photocurable resin, a photoinitiator, a dye, a photosensitive resin composition, and the like. Among them, the step of injecting the raw material of the color filter onto the mask plate can be realized by an inkjet printing process. After injecting the raw material of the color filter, it can be preliminarily cured, so that a color filter structure 23a can be obtained on one side surface of each microlens structure 22a in the groove of the mask plate.

[0111] The present application also provides a display device, which comprises a micro display screen 1000, the specific structure of which is referred to the above embodiments. Since the micro display screen 1000 adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0112] Among them, the micro display screen 1000 can be set as a silicon-based OLED display screen, or a micro LED display screen, or other display screen types; the specific implementation type of the micro display screen 1000 and its design requirements for the main light ray angle can be set according to actual needs, which is not limited here.

[0113] Specifically, the micro display screen 1000 can be applied to a display device such as a near-eye display device, which can be applied to virtual reality and / or augmented reality and / or extended reality and other application scenarios.

[0114] The micro display screen 1000 and the preparation method thereof of the present application will be described below through specific embodiments:

[0115] Embodiment 1:

[0116] As shown in FIGS. 1 and 2, the micro display screen 1000 is a white light micro OLED screen. Specifically, the micro display screen 1000 comprises a substrate layer 200, a pixel layer 300, an encapsulation layer 400 and a filter layer 23 arranged in sequence from bottom to top. The side of the filter layer 23 away from the encapsulation layer 400 is sequentially provided with a transparent curved surface layer 10 and a microlens array layer 20 from bottom to top. Among them, the microlens array layer 20 specifically comprises a support layer 21 and a microlens array 22 arranged on the surface of the support layer 21.

[0117] In the embodiment, the sub-pixels 310 of the pixel layer 300 emit white light outward, the white light passes through the encapsulation layer 400 and the filter layer 23 in turn, is converted into light of different colors by the filter layer 23, and then passes through the transparent curved surface layer 10, the support layer 21 and is transmitted to the microlens array 22 to modulate the transmission direction of the light by the microlens structure 22a, so that the angle between the light and the normal of the plane where the pixel layer 300 of the micro display screen 1000 is located can meet the required chief ray angle of the optical-mechanical imaging system. The filter layer 23 can be formed by attaching a colored filter film on the surface of the encapsulation layer 400 of the micro display screen 1000.

[0118] The micro display screen 1000 of the embodiment is prepared according to the following steps:

[0119] The transparent curved surface layer 10 is prepared by a nano-imprinting process or an injection molding process.

[0120] The microlens array layer 20 is prepared by a nano-imprinting process, and the support layer 21 is at the bottom, and a plurality of microlens structures 22a are arranged in the microlens array layer 20.

[0121] The support layer 21 of the microlens array layer 20 is attached to the curved surface of the transparent curved surface layer 10 by an adhesive.

[0122] Specifically, the microlens array layer 20 of the micro display screen 1000 of the embodiment is prepared according to the following steps:

[0123] Step one: providing a mask plate, wherein a groove is formed in the mask plate for accommodating the injected raw material of the microlens array layer 20, a barrier layer is arranged in the groove, which can block a plurality of recesses from each other in the groove and prevent mutual penetration and influence between the recesses; a plurality of recesses are arranged in an array, and the bottom shape of the recess is matched with the outer contour of the microlens structure 22a.

[0124] Step two: preparing the microlens array 22; the specific operation is: uniformly injecting the raw material of the microlens array 22 into the mask plate by an inkjet printing process, the raw material can be set as PDMS, PMMA, epoxy resin and other heat-curable or ultraviolet-curable materials, and then the raw material is subjected to curing treatment to obtain a plurality of microlens structures 22a corresponding to the plurality of recesses by preliminary curing, and the microlens array 22 is composed of the plurality of microlens structures 22a.

[0125] Step three: preparing the support layer 21; the specific operation is: uniformly injecting a layer of raw material of the support layer 21 into the mask through a spin coating or inkjet printing process, so that the raw material fills the top of the recess, the raw material can be set as PDMS, PMMA, epoxy resin and other heat-curable or ultraviolet-curable materials, and then the raw material is subjected to curing treatment to form a deformable support layer 21 on the side of the filter layer 23 away from the microlens array 22, that is, the microlens array layer 20 is prepared in the groove of the mask.

[0126] Step four: obtaining the microlens array layer 20; the specific operation is: peeling the microlens array 22, the filter layer 23 and the support layer 21 of the microlens array layer 20 from the mask, thereby obtaining the microlens array layer 20 shown in step six.

[0127] Further, after the microlens array layer 20 is prepared, an adhesive layer can be coated on the curved surface of the support layer 21 or the transparent curved layer 10, so that the support layer 21 is combined with the curved surface of the transparent curved layer 10 by adhesion.

[0128] Wherein, the transparent curved layer 10 can be fixedly attached to the side surface of the filter layer 23 away from the packaging layer 400, thereby preparing the micro display device 100.

[0129] Example 2:

[0130] As shown in FIG. 3, the micro display screen 1000 is a white light micro OLED screen. Specifically, the micro display screen 1000 includes a base layer 200, a pixel layer 300 and a packaging layer 400 arranged in order from bottom to top. The transparent curved layer 10 and the microlens array layer 20 are arranged in order from bottom to top on the side of the packaging layer 400 away from the pixel layer 300. The microlens array layer 20 specifically includes a support layer 21, a filter layer 23 arranged on the surface of the support layer 21, and a microlens array 22 arranged on the filter layer 23. The filter layer 23 includes a plurality of color filter structures 23a composed of color filters, and the microlens array 22 includes a plurality of arrayed microlens structures 22a, each color filter structure 23a corresponding to a microlens structure 22a.

[0131] In the embodiment, the sub-pixels 310 of the pixel layer 300 outgo white light, and the white light sequentially passes through the encapsulation layer 400, the filter layer 23, the transparent curved layer 10, and the support layer 21, and then the white light outgoed by each sub-pixel 310 can correspond to passing through a color filter structure 23a and a microlens structure 22a, so as to convert the white light into light of different colors through the color filter structure 23a, and then modulate the transmission direction of the light through the microlens structure 22a, so that the angle between the light and the normal of the plane where the pixel layer 300 of the micro display screen 1000 is located can meet the required chief ray angle of the optical-mechanical imaging system.

[0132] It can be understood that, since the color filter structure 23a and the microlens structure 22a are adjacently arranged in the embodiment, the risk of light collected by the microlens structure 22a generating color bleeding is reduced, and the display effect of the micro display screen 1000 is guaranteed.

[0133] The micro display screen 1000 of the embodiment is prepared according to the following steps:

[0134] The transparent curved layer 10 is prepared by a nano-imprinting process or an injection molding process;

[0135] The microlens array layer 20 is prepared by a nano-imprinting process, and the microlens array layer 20 has the support layer 21 as the bottom, and the color filter structure 23a and the microlens structure 22a are one-to-one corresponding and arrayed on the support layer 21;

[0136] The support layer 21 of the microlens array layer 20 is attached to the curved surface of the transparent curved layer 10 by an adhesive.

[0137] Specifically, as shown in FIG. 9, the microlens array layer 20 of the micro display screen 1000 of the embodiment is prepared according to the following steps:

[0138] Step one: providing a mask plate, wherein a groove is formed in the mask plate for accommodating the raw material of the injected microlens array layer 20, a barrier layer is arranged in the groove, which can block a plurality of recesses from each other in the groove and prevent mutual penetration and influence between the recesses; the recesses are arrayed, and the bottom shape of the recesses is matched with the outer contour of the microlens structure 22a.

[0139] Step two: preparing the microlens array 22; the specific operation is: uniformly injecting the raw material of the microlens array 22 into the mask plate by an inkjet printing process, the raw material can be set as PDMS, PMMA, epoxy resin, and other heat-curable or ultraviolet-curable materials, and then the raw material is subjected to curing treatment, so as to obtain a plurality of microlens structures 22a corresponding to the distribution in a plurality of recesses through preliminary curing, and the microlens array 22 is composed of the plurality of microlens structures 22a.

[0140] Step three: preparing the filter layer 23; the specific operation is: uniformly injecting the color filter material into the mask plate through the inkjet printing process, which can specifically include photocurable resin, photoinitiator, dye, photosensitive resin composition, etc., and then performing curing treatment on the color filter material to obtain a plurality of color filter structures 23a corresponding to the distribution in the plurality of recesses, and each color filter structure 23a is arranged on one side of a microlens structure 22a, and the filter layer 23 is composed of a plurality of color filter structures 23a.

[0141] Step four: preparing the support layer 21; the specific operation is: uniformly injecting a layer of raw material of the support layer 21 into the mask plate through the spin coating or inkjet printing process, so that the raw material fills the top of the recess, the raw material can be set as PDMS, PMMA, epoxy resin, etc. Heat-curable or ultraviolet-curable material, and then performing curing treatment on the raw material to form a layer of deformable support layer 21 on the side of the filter layer 23 away from the microlens array 22, that is, the microlens array layer 20 can be prepared in the groove of the mask plate.

[0142] Step five: obtaining the microlens array layer 20; the specific operation is: peeling the microlens array 22, the filter layer 23 and the support layer 21 of the microlens array layer 20 from the mask plate, thereby obtaining the microlens array layer 20 shown in step six of FIG. 9.

[0143] Further, after the microlens array layer 20 is prepared, an adhesive layer can be coated on the curved surface of the support layer 21 or the transparent curved layer 10, so that the support layer 21 is combined with the curved surface of the transparent curved layer 10 by adhesion.

[0144] Wherein, the transparent curved layer 10 can be fixedly attached to the side surface of the packaging layer 400 away from the pixel layer 300, thereby preparing the micro display device 100.

[0145] Example 3:

[0146] As shown in FIG. 4, the micro display screen 1000 is a white light micro OLED screen. Specifically, the micro display screen 1000 includes a base layer 200, a pixel layer 300 and a packaging layer 400 arranged in order from bottom to top. The transparent curved layer 10 and the microlens array layer 20 are arranged in order from bottom to top on the side of the packaging layer 400 away from the pixel layer 300. Wherein, the microlens array layer 20 specifically includes a support layer 21 and a microlens array 22 arranged on a filter layer 23, the microlens array 22 includes a plurality of arrayed microlens structures 22a, and the material of the microlens structure 22a is color filter material.

[0147] In the embodiment, the sub-pixels 310 of the pixel layer 300 outgo white light, and the white light passes through the encapsulation layer 400, the filter layer 23, the transparent curved layer 10 and the support layer 21 in sequence, and then the white light outgoed by each sub-pixel 310 can correspond to a microlens structure 22a composed of a color filter material, at this time, the microlens structure 22a can play the roles of filter color and lens control light direction, so as to convert the white light into light of different colors while modulating the transmission direction of the light, so that the angle between the light and the normal of the plane where the pixel layer 300 of the micro display screen 1000 is located can meet the required chief ray angle of the optical-mechanical imaging system.

[0148] It can be understood that, since the microlens structure 22a in the embodiment is composed of a color filter material, on the one hand, the risk of light crosstalk caused by a large distance between the filter structure and the microlens structure 22a can be reduced, and on the other hand, the filter layer 23 can be avoided to be set, so that the devices of the micro display screen 1000 can be reduced, which is beneficial to improve the structural compactness of the micro display screen 1000.

[0149] The micro display screen 1000 of the embodiment is prepared according to the following steps:

[0150] The transparent curved layer 10 is prepared by a nano-imprinting process or an injection molding process;

[0151] The microlens array layer 20 is prepared by a nano-imprinting process, and the support layer 21 is at the bottom, and a plurality of microlens structures 22a are arranged in an array on the support layer 21.

[0152] The support layer 21 of the microlens array layer 20 is attached to the curved surface of the transparent curved layer 10 by an adhesive.

[0153] Specifically, the microlens array layer 20 of the micro display screen 1000 of the embodiment is prepared according to the following steps:

[0154] Step one: providing a mask plate, wherein a groove is formed in the mask plate for accommodating the injected raw material of the microlens array layer 20, a barrier layer is arranged in the groove, which can block a plurality of recesses from each other in the groove and prevent mutual penetration and influence between the recesses; a plurality of recesses are arranged in an array, and the bottom shape of the recess is matched with the outer contour of the microlens structure 22a.

[0155] Step two: preparing the microlens array 22; specifically, the raw material of the microlens array 22 is uniformly injected into the mask through the inkjet printing process, which can be set as a color filter material, and specifically can include photocuring resin, photoinitiator, dye, photosensitive resin composition, etc., and then the raw material is cured to obtain a plurality of microlens structures 22a corresponding to the distribution in a plurality of recesses, and the microlens array 22 is composed of a plurality of microlens structures 22a.

[0156] Step three: preparing the support layer 21; specifically, a layer of raw material of the support layer 21 is uniformly injected into the mask through the spin coating or inkjet printing process, so that the raw material is filled above the recess, which can be set as PDMS, PMMA, epoxy resin, etc. heat-curable or ultraviolet-curable material, and then the raw material is cured to form a layer of deformable support layer 21 on the side of the filter layer 23 away from the microlens array 22, that is, the microlens array layer 20 can be prepared in the groove of the mask.

[0157] Step four: obtaining the microlens array layer 20; specifically, the microlens array 22, the filter layer 23 and the support layer 21 of the microlens array layer 20 are peeled off from the mask, so that the microlens array layer 20 shown in step six can be obtained.

[0158] Further, after the microlens array layer 20 is prepared, an adhesive layer can be coated on the curved surface of the support layer 21 or the transparent curved layer 10, so that the support layer 21 is combined with the curved surface of the transparent curved layer 10 by adhesion.

[0159] Wherein, the transparent curved layer 10 can be fixedly attached to the side surface of the packaging layer 400 away from the pixel layer 300, so that the micro display device 100 can be prepared.

[0160] Example 4:

[0161] As shown in FIG. 5, the micro display screen 1000 is a silicon-based OLED full-color device. Specifically, the micro display screen 1000 includes a substrate layer 200, a pixel layer 300 and a packaging layer 400 arranged in order from bottom to top. The micro display screen 1000 is arranged on the side of the packaging layer 400 away from the pixel layer 300, and sequentially includes a transparent curved layer 10 and a microlens array layer 20 from bottom to top. Wherein, the microlens array layer 20 specifically includes a support layer 21 and a microlens array 22 arranged on the filter layer 23, and the microlens array 22 includes a plurality of arrayed microlens structures 22a.

[0162] In the embodiment, since the micro display screen 1000 can realize full-color display based on RGB three-color independent light emission, it is not necessary to set the filter layer 23 for color filtering, and only the transmission direction of light is modulated by the transparent curved layer 10 and the microlens array layer 20 of the micro display screen 1000, so that the included angle between the light and the normal of the plane where the pixel layer 300 of the micro display screen 1000 is located can meet the required chief ray angle of the optical-mechanical imaging system.

[0163] The micro display screen 1000 of the embodiment is prepared according to the following steps:

[0164] The transparent curved layer 10 is prepared by a nano-imprinting process or an injection molding process;

[0165] The microlens array layer 20 is prepared by a nano-imprinting process, and the support layer 21 is at the bottom, and a plurality of microlens structures 22a are arranged in an array on the support layer 21.

[0166] The support layer 21 of the microlens array layer 20 is attached to the curved surface of the transparent curved layer 10 by an adhesive.

[0167] The transparent curved layer 10 can be fixed on the side surface of the packaging layer 400 away from the pixel layer, so that the micro display device 100 can be prepared.

[0168] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made under the technical concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A microdisplay, characterized by The micro display screen comprises: a pixel layer; a transparent curved surface layer disposed on the light emitting side of the pixel layer, the side surface of the transparent curved surface layer away from the pixel layer being a curved surface, the curvature of the curved surface being arranged to increase from the center of the curved surface to the edge of the curved surface; and a microlens array layer disposed on the curved surface.

2. The microdisplay screen of claim 1, wherein, The microlens array layer comprises: a support layer which is arranged to be deformable and is used to adhere to the curved surface; and a microlens array comprising a plurality of microlens structures, the plurality of microlens structures being arranged in an array on the side of the support layer away from the transparent curved surface layer.

3. The microdisplay screen of claim 2, wherein, The refractive index of the microlens array and the support layer is the same, and the refractive index of the transparent curved surface layer and the support layer is the same.

4. The microdisplay screen of claim 2, wherein, The microlens array layer further comprises a color filter layer, the color filter layer comprising a plurality of color filter structures, each of the color filter structures being disposed between a microlens structure and the support layer; and / or, the micro display screen further comprises a color filter layer, the color filter layer being disposed between the pixel layer and the transparent curved surface layer, the color filter layer comprising a plurality of color filter structures, each of the color filter structures being arranged to correspond to each sub-pixel of the pixel layer; and / or, the microlens structure is composed of a color filter material.

5. The microdisplay screen of any of claims 1 to 4, wherein, The micro display screen further comprises a planarization layer, the planarization layer being disposed on the side of the microlens array layer away from the transparent curved surface layer, the refractive index of the planarization layer being less than the refractive index of the microlens structure; and / or, the microlens array layer comprises a plurality of microlens structures, each of the microlens structures being arranged to correspond to each sub-pixel of the pixel layer.

6. A method of manufacturing a microdisplay according to any one of claims 1 to 5, characterised in that, The method comprises the following steps: preparing a transparent curved surface layer, the side surface of the transparent curved surface layer being a curved surface, the curvature of the curved surface being arranged to increase from the center of the curved surface to the edge of the curved surface; preparing a microlens array layer, and transferring the microlens array layer to the curved surface of the transparent curved surface layer.

7. The production method according to claim 6, wherein The step of preparing the microlens array layer comprises: providing a mask plate; injecting raw materials of a microlens array into the mask plate, and curing to form the microlens array; injecting raw materials of a support layer into the mask plate, and curing to form the support layer on the microlens array to obtain the microlens array layer; separating the mask plate from the microlens array layer.

8. The production method according to claim 7, wherein Before the step of injecting raw materials of a support layer into the mask plate, and curing to form the support layer on the microlens array to obtain the microlens array layer, the method further comprises: injecting raw materials of a color filter into the mask plate, and curing to form a color filter layer on the microlens array.

9. The production method according to claim 6, wherein The step of transferring the microlens array layer to the curved surface of the transparent curved surface layer comprises: coating an adhesive on the curved surface of the transparent curved surface layer; adhering the microlens array layer to the curved surface of the transparent curved surface layer.

10. A display device, characterized by comprising: The micro display screen comprises any one of claims 1 to 5.

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