Micro display screen, preparation method thereof and display equipment

Abstract

The invention discloses a micro display screen and a preparation method thereof and display equipment, and relates to the technical field of micro display screens, the micro display screen comprises a pixel layer, a transparent curved surface layer and a micro lens array layer, the transparent curved surface layer is arranged on the light emitting side of the pixel layer, and the surface of the side, away from the pixel layer, of the transparent curved surface layer is a curved surface; the curvature of the curved surface is gradually increased from the center of the curved surface to the edge of the curved surface, and the curved surface is located on the side, away from the pixel layer, of the transparent curved surface layer; the micro-lens array layer is arranged on the curved surface; according to the technical scheme, the display brightness of the micro display screen and the uniformity of brightness display can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of micro display screens, and in particular to a micro display screen and a preparation method and a display device thereof. Background Art

[0002] In the related technology, the core components of near-eye display devices include a micro display screen and an optical-mechanical imaging system. The micro display screen emits light through each sub-pixel in the pixel layer. Among them, the angle between the imaging light of the micro display screen and the normal of the plane where the pixel layer is located is the principal ray angle. The size of the principal ray angle affects how the light emitted by the micro display screen enters the optical-mechanical imaging system and is finally accepted by the human eye.

[0003] At present, in order to ensure the display brightness and display uniformity of the micro display screen and adapt to the design requirements of the optical imaging system, the main ray angle of the micro display screen at different positions needs to gradually increase from the center of the screen to the edge. However, each sub-pixel in the pixel layer of the existing micro display screen usually has the same light emission direction and brightness, so that the main 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 imaging system for the main ray angle, resulting in uneven brightness of the micro display screen, where the brightness gradually decreases from the center of the screen to the edge. Summary of the invention

[0004] The main purpose of the present invention is to provide a micro display screen and a preparation method and a display device thereof, aiming to ensure the display brightness and display uniformity of the micro display screen.

[0005] To achieve the above object, the micro display screen proposed by the present invention comprises:

[0006] Pixel layer;

[0007] a transparent curved surface layer, the transparent curved surface layer being arranged on the light-emitting side of the pixel layer, the surface of the transparent curved surface layer facing away from the pixel layer being a curved surface, and the curvature of the curved surface increasing from the center of the curved surface to the edge of the curved surface; and

[0008] A microlens array layer is disposed on the curved surface.

[0009] In one embodiment, the microlens array layer comprises:

[0010] A support layer, wherein the support layer is deformable and configured to be attached to the curved surface; and

[0011] A microlens array, wherein the microlens array comprises a plurality of the microlens structures, and the plurality of the microlens structure arrays are arranged on a side of the support layer away from the transparent curved surface layer.

[0012] In one 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.

[0013] In one embodiment, the microlens array layer further comprises a filter layer, the filter layer comprises a plurality of color filter structures, each of the color filter structures is disposed between one of the microlens structures and the support layer;

[0014] And / or, the microlens structure is made of a color filter material.

[0015] In one embodiment, the micro display screen further comprises a planarization layer, the planarization layer is arranged on a side of the micro lens array layer away from the transparent curved surface layer, and the refractive index of the planarization layer is smaller than the refractive index of the micro lens structure;

[0016] And / or, the microlens array layer includes a plurality of microlens structures, and each of the microlens structures is arranged corresponding to each sub-pixel of the pixel layer.

[0017] To achieve the above object, the present invention provides a method for preparing a micro display screen, comprising the following steps:

[0018] Prepare a transparent curved surface layer, wherein one side of the transparent curved surface 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;

[0019] A microlens array layer is prepared, and the microlens array layer is transferred onto the curved surface of the transparent curved surface layer.

[0020] In one embodiment, the step of preparing the microlens array layer comprises:

[0021] Provide mask plates;

[0022] Injecting raw materials of the microlens array into the mask plate and solidifying it to form the microlens array;

[0023] Injecting a raw material of a support layer into the mask plate, and solidifying the support layer on the microlens array to form a microlens array layer;

[0024] The mask and the microlens array layer are separated.

[0025] In one embodiment, before the step of injecting a raw material of a support layer into the mask and solidifying the support layer on the microlens array to form a microlens array layer, the step further includes:

[0026] The raw material of the color filter is injected into the mask plate and solidified on the microlens array to form a filter layer.

[0027] In one embodiment, the step of transferring the microlens array layer onto the curved surface of the transparent curved surface layer comprises:

[0028] Applying adhesive on the curved surface of the transparent curved surface layer;

[0029] The microlens array layer is adhered to the curved surface of the transparent curved surface layer.

[0030] The present invention also provides a display device, comprising any one of the aforementioned micro display screens.

[0031] The technical solution of the present invention is to gradually increase the curvature of the curved surface of the transparent curved surface layer from its center to the edge, and to arrange the microlens array layer on the curved surface, so that each microlens structure in the microlens array layer can be deflected according to the curvature of the corresponding 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 respectively, 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 main light angle required by the optical imaging system, thereby improving the eye brightness of the micro display screen and the uniformity of brightness display. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of the first embodiment of the micro display screen of the present invention;

[0034] Figure 2 for Figure 1 Schematic diagram of some structures in ;

[0035] Figure 3 It is a partial structural schematic diagram of the second embodiment of the micro display screen of the present invention;

[0036] Figure 4 A partial structural schematic diagram of a third embodiment of a micro display screen of the present invention;

[0037] Figure 5 A partial structural schematic diagram of a fourth embodiment of a micro display screen of the present invention;

[0038] Figure 6 It is a flow chart of the first embodiment of the method for preparing a micro display screen of the present invention;

[0039] Figure 7for Figure 6 Part of the flow chart in ;

[0040] Figure 8 It is a flow chart of a second embodiment of the method for preparing a micro display screen of the present invention;

[0041] Fig. 9 for Figure 8 Schematic diagram of the structure during the preparation process.

[0042] Description of Figure Numbers:

[0043] 1000, micro display screen;

[0044] 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. Flattening layer;

[0045] 200, grass-roots;

[0046] 300, pixel layer; 310, sub-pixel;

[0047] 400. Encapsulation layer.

[0048] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] In the related technology, the core components of near-eye display devices include a micro display screen and an optical-mechanical imaging system. The micro display screen emits light through each sub-pixel in the pixel layer. Among them, the angle between the imaging light of the micro display screen and the normal of the plane where the pixel layer is located is the principal ray angle. The size of the principal ray angle affects how the light emitted by the micro display screen enters the optical-mechanical imaging system and is finally accepted by the human eye.

[0053] At present, in order to ensure the display brightness and display uniformity of the micro display screen and adapt to the design requirements of the optical imaging system, the main ray angle of the micro display screen at different positions needs to gradually increase from the center of the screen to the edge. However, each sub-pixel in the pixel layer of the existing micro display screen usually has the same light emission direction and brightness, so that the main 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 imaging system for the main ray angle, resulting in uneven brightness of the micro display screen, where the brightness gradually decreases from the center of the screen to the edge.

[0054] The present invention provides a micro display screen 1000 applied to a display device.

[0055] See also Figures 1 to 5 In one embodiment of the present invention, the micro display screen 1000 includes:

[0056] Pixel layer 300;

[0057] A transparent curved layer 10, the transparent curved layer 10 is disposed on the light-emitting side of the pixel layer 300, the surface of the transparent curved layer 10 on the side away from the pixel layer 300 is a curved surface, the curvature of the curved surface increases from the center to the edge of the curved surface, and the curved surface is located on the side of the transparent curved layer 10 away from the pixel layer 300; and

[0058] The microlens array layer 20 is disposed on a curved surface.

[0059] Among them, the transparent curved surface layer 10 and the microlens array layer 20 can be set to be light-transmissive, and 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 outward through the encapsulation layer 400 of the micro display screen 1000 to pass through the transparent curved surface layer 10 and the microlens array 22 in the microlens array layer 20 in sequence. Specifically, the microlens array 22 is composed of a plurality of microlens structures 22a arranged in an array. In some embodiments, the curved surface of the transparent curved surface layer 10 can be set to be a concave surface that is concave in the direction toward 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 set to a conventional array, that is, the size, morphology, and spacing of each microlens structure 22a are the same; the microlens array 22 can also be an unconventional array, that is, the size, morphology, 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 actual design requirements, which is conducive to ensuring the adjustment effect of the microlens array layer 20 on the propagation direction of light.

[0060] The technical solution of the present invention is to gradually increase the curvature of the curved surface of the transparent curved surface layer 10 from its center to the edge, and to arrange the microlens array layer 20 on the curved surface, so that each microlens structure 22a in the microlens array layer 20 can be deflected according to the curvature of the corresponding 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 respectively, and the propagation direction of the light can be deflected 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 main light angle required by the optical imaging system, thereby improving the eye brightness of the micro display screen 1000 and the uniformity of brightness display.

[0061] See also Figures 1 to 5 In an embodiment of the present invention, the microlens array layer 20 comprises:

[0062] A support layer 21, which is deformable and used to be attached to a curved surface; and

[0063] The microlens array 22 includes a plurality of microlens structures 22 a , and the plurality of microlens structures 22 a are arranged in an array on a side of the support layer 21 away from the transparent curved layer 10 .

[0064] Among them, the material of the support layer 21 can be set to have a certain flexibility, so that it can be stretched or compressed to a certain extent, so that the support layer 21 can change its own morphology along the contour of the curved surface when attached to the curved surface of the transparent curved surface layer 10, so that the support layer 21 can fit well with the curved surface, which is beneficial to improve the bonding stability between the microlens array layer 20 and the transparent curved surface layer 10.

[0065] In some embodiments, the support layer 21 itself may have a certain degree of viscosity, so as to be directly attached to the curved surface of the transparent curved layer 10; the support layer 21 may 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 method can be set according to actual needs and is not limited here.

[0066] In the embodiment of the present invention, the refractive index of the microlens array 22 and the supporting layer 21 is the same, and the refractive index of the transparent curved surface layer 10 and the supporting layer 21 is the same.

[0067] It can be understood that by making the refractive index of the microlens array 22 and the supporting layer 21 the same or similar, the curved surface of the transparent curved layer 10 can be used only to control the installation orientation of a plurality of microlens structures 22a arranged on the curved surface by limiting the curvature of the curved surface. The existence of the curved surface itself will not change the direction of light transmission, thereby making it possible to keep the direction of light transmission unchanged when the light is transmitted from the transparent curved layer 10 to the supporting layer 21, thereby facilitating the optical path design of the micro display screen 1000.

[0068] In some embodiments, the micro display screen 1000 can be configured as a silicon-based OLED full-color device, which can achieve full-color display without setting a color filter. At this time, the transparent curved layer 10 and the microlens array layer 20 in the aforementioned embodiment can be directly set on the surface of the encapsulation layer 400 of the micro display screen 1000.

[0069] In some embodiments, the micro display screen 1000 further includes a filter layer 23 , which is disposed between the pixel layer 300 and the transparent curved layer 10 . The filter layer 23 includes a plurality of color filter structures 23 a , and each color filter structure 23 a is disposed corresponding to each sub-pixel 310 of the pixel layer 300 .

[0070] Specifically, the micro display screen 1000 can be set as a WOLED device, and the sub-pixels 310 of the pixel layer 300 are used to emit white light. The surface of the encapsulation layer 400 of the micro display screen 1000 can be provided with a filter layer 23, and the filter layer 23 is used to set a color filter structure 23a composed of a color filter corresponding to each sub-pixel 310 to achieve the emission of light of different colors. The transparent curved layer 10 and the microlens array layer 20 in the aforementioned embodiment can be arranged on the light emitting side of the filter layer 23.

[0071] It should be noted that, with respect to the technical solution in which a filter layer 23 can be provided on the surface of the encapsulation layer 400 of the micro display screen 1000, since the light emitted by the sub-pixel 310, after passing through the filter layer 23, must sequentially pass through the transparent curved layer 10 and the support layer 21 before being transmitted to the microlens structure 22a, the distance between the filter layer 23 and the microlens structure 22a is relatively large, so that the light collected by the microlens structure 22a may produce problems such as cross-color.

[0072] Of course, the technical solution of the present invention is not limited to this. In some embodiments, the surface of the encapsulation layer 400 of the WOLED device may not be provided with a filter layer 23. Accordingly, a color filter structure 23a may be added to the microlens array layer 20 of the microdisplay screen 1000 as described in the embodiments below, thereby realizing a color filtering function, which will not be elaborated here.

[0073] Specifically, see Figure 3 In an embodiment of the present invention, the microlens array layer 20 further includes a filter layer 23 . The filter layer 23 includes a plurality of color filter structures 23 a . Each color filter structure 23 a is disposed between a microlens structure 22 a and the support layer 21 .

[0074] In this 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 conducive to reducing the distance between the color filter structure 23a and the microlens structure 22a, and is conducive to reducing the risk of cross-color generation of the light collected by the microlens structure 22a, thereby ensuring the display effect of the micro display screen 1000.

[0075] Of course, the technical solution of the present invention is not limited to this. Figure 4 In the embodiment of the present invention, the microlens structure 22a is made of a color filter material.

[0076] It can be understood that by directly preparing the microlens structure 22a based on the color filter material, the microlens structure 22a can take into account the functions of the filter color filtering and the lens controlling the light direction. On the one hand, it can reduce the risk of cross-color generation in the light collected by the microlens structure 22a. On the other hand, it can avoid the need to set the filter layer 23, thereby reducing the devices of the micro display screen 1000, which is beneficial to improving the structural compactness of the micro display screen 1000.

[0077] See also Figures 1 to 5 In an embodiment of the present invention, the micro display screen 1000 further includes a planarization layer 30, which is disposed on a side of the micro lens array layer 20 away from the transparent curved surface layer 10, and a refractive index of the planarization layer 30 is less than a refractive index of the micro lens structure 22a.

[0078] It can be understood that, by providing the planarization layer 30 , on the one hand, it can play a planarization role, and on the other hand, it is helpful to protect and fix the microlens array layer 20 of the above-mentioned embodiment.

[0079] Furthermore, by making the refractive index of the flattening layer 30 smaller than the refractive index of the microlens structure 22a, it is beneficial to realize the convergence effect of the microlens structure 22a on light, so that the microlens array layer 20 can modulate the transmission direction of the light, so that the angle between the imaging light of the microdisplay screen 1000 and the normal of the plane where the pixel layer 300 of the microdisplay screen 1000 is located can meet the main light angle required by the optical imaging system.

[0080] See also Figures 1 to 5 In an embodiment of the present invention, the microlens array layer 20 includes a plurality of microlens structures 22 a , and each microlens structure 22 a is disposed in one-to-one correspondence with each sub-pixel 310 of the pixel layer 300 .

[0081] In this way, the micro display screen 1000 can control the propagation direction of light at the level of the sub-pixel 310, thereby ensuring the brightness of the micro display screen 1000 and the uniformity of the brightness display. Of course, the technical solution of the present invention is not limited thereto, and in some embodiments, the micro lens structure 22a and the sub-pixel 310 can be arranged one-to-many or many-to-one, which is not limited here.

[0082] In view of the technical problems mentioned in the background technology, the present invention further proposes a method for preparing a micro display screen 1000 , aiming to ensure the display brightness and display uniformity of the micro display screen 1000 .

[0083] The preparation method of the micro display screen 1000 proposed by the present invention will be described in the following specific embodiments:

[0084] like Figure 6 FIG. 1 is a first embodiment of a method for preparing a housing structure of the present invention. In this embodiment, the method for preparing the micro display screen 1000 includes the following steps:

[0085] Step S10, preparing a transparent curved surface layer 10, wherein 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;

[0086] The transparent curved surface layer 10 may be prepared by, but is not limited to, a nanoimprinting process or an injection molding process, and the material of the transparent curved surface layer 10 may be set to be a light-transmitting material having a refractive index similar to or the same as that of the microlens array layer 20 .

[0087] It can be understood that by setting one side surface of the transparent curved layer 10 as a curved surface and increasing the curvature of the curved surface from the center to the edge of the curved surface, the angles between the tangents at different orientations on the curved surface and the normal of the pixel layer 300 of the micro display screen 1000 can meet or approach the main light angle required by the optical imaging system, thereby facilitating the display brightness and display uniformity of the micro display screen 1000.

[0088] Step S20 , preparing a microlens array layer 20 , and transferring the microlens array layer 20 onto the curved surface of the transparent curved layer 10 .

[0089] The microlens array layer 20 can be prepared by, but is not limited to, a nanoimprint process, and the microlens array layer 20 includes a support layer 21 and a microlens array 22 disposed on the support layer 21, and the microlens array 22 includes a plurality of microlens structures 22a arranged in an array. Specifically, the materials of the support layer 21 and the microlens array 22 disposed on the support layer 21 can both be set to PDMS, PMMA, epoxy resin, or other heat-curable or UV-curable materials, or the material of the support layer 21 can be set to PDMS, PMMA, epoxy resin, or other heat-curable or UV-curable materials, and the material of the microlens array 22 can be set to a color filter material as in the aforementioned embodiment, so that the microlens structure 22a takes into account both the color filtering of the filter and the light direction control of the lens.

[0090] After the microlens array layer 20 is prepared, the microlens array layer 20 can be attached to the curved surface of the transparent curved layer 10 to achieve the combination of the microlens array layer 20 and 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 encapsulation layer 400 of the corresponding display device, and the micro display screen 1000 can be prepared.

[0091] See also Figure 7 In an embodiment of the present invention, the aforementioned step S20, namely the step of “preparing the microlens array layer 20”, further comprises:

[0092] Step S21, providing a mask;

[0093] Among them, the mask plate includes a specially designed groove, and a barrier layer is provided in the groove, which can block and form a number of mutually isolated recessed parts in the groove, and can prevent the recessed parts from penetrating and affecting each other; the recessed parts are arranged in an array, and the shape of the recessed parts is adapted to the outer contour of the microlens structure 22a.

[0094] Step S22, injecting raw materials of the microlens array 22 into the mask plate and curing to form the microlens array 22;

[0095] The raw material of the microlens array 22 can be set to PDMS, PMMA, epoxy resin and other heat-curable or UV-curable materials, or can be set to color filter materials, so that the microlens structure 22a can take into account the functions of color filtering of the filter and control of light direction of the lens.

[0096] Specifically, the step of injecting the raw material of the microlens array 22 into the mask can be achieved by an inkjet printing process. After the raw material of the microlens array 22 is injected, the raw material of the microlens array 22 can be preliminarily cured by thermal curing or photocuring to form a microlens structure 22a in each recessed portion of the mask groove.

[0097] Step S23, injecting the raw material of the support layer 21 into the mask plate, and solidifying the support layer 21 on the microlens array 22 to form the microlens array layer 20;

[0098] The material of the support layer 21 can be, but is not limited to, PDMS, PMMA, epoxy resin or other heat-curable or UV-curable materials, so as to cure the support layer 21 on the microlens array 22, thereby preparing the microlens array layer 20. Since the material of the support layer 21 has a flexible property, the prepared support layer 21 can be deformed to a certain extent, so that when it is subsequently combined with the curved surface of the transparent curved surface layer 10, it can be well attached to the curved surface of the transparent curved surface layer 10, so that the microlens array 22 can adjust its setting position according to the curvature of the curved surface.

[0099] Specifically, the step of injecting the raw material of the support layer 21 onto the mask can be achieved by inkjet printing or spin coating, which is not limited here. After injecting the raw material of the support layer 21, it can be initially cured to obtain the support layer 21 on the microlens array 22.

[0100] In step S24 , the mask and the microlens array layer 20 are separated.

[0101] By peeling the microlens array layer 20 from the mask, a microlens array layer 20 with a support layer 21 as the bottom and a microlens array 22 disposed thereon can be 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 as 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 encapsulation layer 400 of the corresponding display device, and the micro display screen 1000 can be prepared.

[0102] For further information, see Figure 7 In an embodiment of the present invention, the aforementioned step S20, i.e., the step of “transferring the microlens array layer 20 to the curved surface of the transparent curved layer 10”, further includes:

[0103] Step S25, coating an adhesive on the curved surface of the transparent curved surface layer 10;

[0104] The adhesive may be, but is not limited to, transparent glue, UV glue, thermoplastic glue, etc.

[0105] Step S26 , adhering the microlens array layer 20 to the curved surface of the transparent curved surface layer 10 .

[0106] It can be understood that, compared with using the viscosity of the support layer 21 itself to directly attach the support layer 21 to the curved surface of the transparent curved layer 10, this embodiment first coats a layer of adhesive on the curved surface of the transparent curved layer 10, and then fixes the support layer 21 of the microlens array layer 20 with the adhesive, which is beneficial to ensure the connection strength between the microlens array layer 20 and the transparent curved layer 10, so as to improve the structural stability of the prepared micro display screen 1000.

[0107] Furthermore, in an embodiment of the present invention, 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 following steps are further included:

[0108] A planarization layer 30 is prepared on a side of the microlens array layer 20 facing away from the transparent curved surface layer 10 .

[0109] The planarization layer 30 can be prepared by spin coating, flow coating, etc. The planarization layer 30 can play a planarization role and can protect and fix the plastic microlens array layer 20.

[0110] Specifically, the material of the planarization layer 30 is a light-transmitting material, and its refractive index is smaller than the refractive index of the microlens structure 22a, which is conducive to realizing the convergence effect of the microlens structure 22a on light, so that the microlens array layer 20 can modulate the transmission direction of the light, 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 main light angle required by the optical imaging system.

[0111] like Figure 8 , which is a partial flow chart of the second embodiment of the method for preparing the micro display screen 1000 of the present invention. The difference between this embodiment and the first embodiment is that before step S23 in the first embodiment, i.e., the step of "injecting the raw material of the support layer 21 into the mask plate and solidifying the support layer 21 on the micro lens array 22 to obtain the micro lens array layer 20", it also includes:

[0112] Step S27 , injecting the raw material of the color filter into the mask plate and solidifying it on the microlens array 22 to form the filter layer 23 .

[0113] In some embodiments, the raw material of the color filter may include photocurable resin, photoinitiator, dye, photosensitive resin composition, etc. The step of injecting the raw material of the color filter onto the mask may be achieved by an inkjet printing process. After the raw material of the color filter is injected, it may be initially cured, so that a color filter structure 23a may be obtained by curing on one side surface of each microlens structure 22a in the groove of the mask.

[0114] The present invention also provides a display device, which includes a micro display screen 1000. The specific structure of the micro display screen 1000 refers to the above embodiment. Since the micro display screen 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0115] Among them, the micro display screen 1000 can be set as a silicon-based OLED display screen, or can be set as a microLED display screen, or can be set as other display screen types; the specific implementation type of the micro display screen 1000 and its design requirements for the main light angle can be set according to actual needs and are not limited here.

[0116] Specifically, the micro display screen 1000 can be applied to a display device such as a near-eye display device, and the near-eye display device can be suitable for application scenarios such as virtual reality and / or augmented reality and / or extended reality.

[0117] The micro display screen 1000 of the present invention and its preparation method are described below through specific embodiments:

[0118] Embodiment 1:

[0119] like Figure 1 and Figure 2 As shown, 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, an encapsulation layer 400 and a filter layer 23 arranged in sequence from bottom to top. The side of the filter layer 23 facing away from the encapsulation layer 400 is provided with a transparent curved surface layer 10 and a micro lens array layer 20 in sequence from bottom to top. Among them, the micro lens array layer 20 specifically includes a support layer 21 and a micro lens array 22 arranged on the surface of the support layer 21.

[0120] In this embodiment, the sub-pixels 310 of the pixel layer 300 emit white light, which passes through the encapsulation layer 400 and the filter layer 23 in sequence, and is converted into light of different colors by the filter layer 23, and then passes through the transparent curved layer 10 and the support layer 21 in sequence and is transmitted to the microlens array 22, so as to 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 chief light angle required by the optical imaging system. Among them, the filter layer 23 can be formed by adding a layer of color filter film to the surface of the encapsulation layer 400 of the micro display screen 1000.

[0121] The micro display screen 1000 of this embodiment is prepared according to the following steps:

[0122] The transparent curved surface layer 10 is formed by a nano-imprinting process or an injection molding process;

[0123] A microlens array layer 20 is formed by a nanoimprint process with a support layer 21 as the base and a plurality of microlens structures 22a arranged in an array on the support layer 21;

[0124] 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.

[0125] Specifically, the microlens array layer 20 of the micro display screen 1000 of this embodiment is prepared according to the following steps:

[0126] Step 1: providing a mask plate, wherein a groove is formed in the mask plate for accommodating the raw material of the microlens array layer 20 to be injected, and a barrier layer is provided in the groove to block and form a plurality of mutually isolated recessed portions in the groove, and to prevent the plurality of recessed portions from penetrating and affecting each other; the plurality of recessed portions are arranged in an array, and the bottom shape of the recessed portions is adapted to the outer contour of the microlens structure 22a.

[0127] Step 2: Prepare the microlens array 22; the specific operation is: uniformly inject the raw material of the microlens array 22 into the mask through an inkjet printing process, and the raw material can be set to PDMS, PMMA, epoxy resin and other heat-curable or UV-curable materials, and then cure the raw material to obtain a number of microlens structures 22a corresponding to the plurality of recessed portions through preliminary curing, and the microlens array 22 is composed of the plurality of microlens structures 22a.

[0128] Step three: prepare the support layer 21; the specific operation is: inject a layer of raw material of the support layer 21 into the mask plate evenly by spin coating or inkjet printing process, so that the raw material fills the top of the recessed portion. The raw material can be set to PDMS, PMMA, epoxy resin and other heat-curable or UV-curable materials, and then the raw material is cured to form a deformable support layer 21 on the side of the filter layer 23 away from the microlens array 22, and the microlens array layer 20 can be prepared in the groove of the mask plate.

[0129] Step 4: Obtain the microlens array layer 20 ; the specific operation is: peel off 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 6.

[0130] Furthermore, after the microlens array layer 20 is prepared, a layer of adhesive may 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.

[0131] The transparent curved layer 10 may be adhered and fixed to the surface of the filter layer 23 which is away from the encapsulation layer 400 , thereby the micro display device 100 may be manufactured.

[0132] Embodiment 2:

[0133] like Figure 3 As shown, 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 an encapsulation layer 400 arranged in sequence from bottom to top. A transparent curved surface layer 10 and a microlens array layer 20 are arranged in sequence from bottom to top on the side of the encapsulation layer 400 away from the pixel layer 300. Among them, 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 microlens structures 22a arranged in an array, and each color filter structure 23a corresponds to a microlens structure 22a.

[0134] In this embodiment, the sub-pixels 310 of the pixel layer 300 emit 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. Then, the white light emitted by each sub-pixel 310 can pass through a color filter structure 23a and a microlens structure 22a accordingly, 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 main light angle required by the optical imaging system.

[0135] It can be understood that, since the color filter structure 23 a and the microlens structure 22 a are disposed adjacent to each other in this embodiment, the risk of cross-coloring caused by the light collected by the microlens structure 22 a is reduced, thereby ensuring the display effect of the micro display screen 1000 .

[0136] The micro display screen 1000 of this embodiment is prepared according to the following steps:

[0137] The transparent curved surface layer 10 is formed by a nano-imprinting process or an injection molding process;

[0138] A microlens array layer 20 is formed by a nano-imprinting process with a support layer 21 as the base, and a plurality of color filter structures 23a and a plurality of microlens structures 22a are arranged in an array on the support layer 21 in a one-to-one correspondence;

[0139] 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.

[0140] Specifically, Fig. 9 As shown, the microlens array layer 20 of the micro display screen 1000 of this embodiment is prepared according to the following steps:

[0141] Step 1: providing a mask plate, wherein a groove is formed in the mask plate for accommodating the raw material of the microlens array layer 20 to be injected, and a barrier layer is provided in the groove to block and form a plurality of mutually isolated recessed portions in the groove, and to prevent the plurality of recessed portions from penetrating and affecting each other; the plurality of recessed portions are arranged in an array, and the bottom shape of the recessed portions is adapted to the outer contour of the microlens structure 22a.

[0142] Step 2: Prepare the microlens array 22; the specific operation is: uniformly inject the raw material of the microlens array 22 into the mask through an inkjet printing process, and the raw material can be set to PDMS, PMMA, epoxy resin and other heat-curable or UV-curable materials, and then cure the raw material to obtain a number of microlens structures 22a corresponding to the plurality of recessed portions through preliminary curing, and the microlens array 22 is composed of the plurality of microlens structures 22a.

[0143] Step 3: preparing the filter layer 23; the specific operation is: uniformly injecting a color filter material into the mask through an inkjet printing process, which may specifically include a photocurable resin, a photoinitiator, a dye, a photosensitive resin composition, etc., and then curing the color filter material to obtain a plurality of color filter structures 23a correspondingly distributed in a plurality of recessed portions through preliminary curing, and each color filter structure 23a is correspondingly arranged on one side of a microlens structure 22a, and the filter layer 23 is composed of a plurality of color filter structures 23a.

[0144] Step 4: Prepare the support layer 21; the specific operation is: inject a layer of raw material of the support layer 21 into the mask plate evenly through spin coating or inkjet printing process, so that the raw material fills the top of the recessed portion. The raw material can be set to PDMS, PMMA, epoxy resin and other heat-curable or UV-curable materials, and then the raw material is cured to form a deformable support layer 21 on the side of the filter layer 23 away from the microlens array 22, so that the microlens array layer 20 can be prepared in the groove of the mask plate.

[0145] Step 5: Obtain the microlens array layer 20; the specific operation is: peel off the microlens array 22, the filter layer 23 and the support layer 21 of the microlens array layer 20 from the mask, thereby obtaining Fig. 9 The microlens array layer 20 shown in step six.

[0146] Furthermore, after the microlens array layer 20 is prepared, a layer of adhesive may 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.

[0147] The transparent curved layer 10 may be adhered and fixed to the surface of the encapsulation layer 400 which is away from the pixel layer 300 , thereby the micro display device 100 may be prepared.

[0148] Embodiment 3:

[0149] like Figure 4 As shown, 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 an encapsulation layer 400 arranged in sequence from bottom to top. A transparent curved surface layer 10 and a micro lens array layer 20 are arranged in sequence from bottom to top on the side of the encapsulation layer 400 away from the pixel layer 300. Among them, the micro lens array layer 20 specifically includes a support layer 21 and a micro lens array 22 arranged on a filter layer 23, and the micro lens array 22 includes a plurality of micro lens structures 22a arranged in an array, and the material of the micro lens structure 22a is a color filter material.

[0150] In this embodiment, the sub-pixels 310 of the pixel layer 300 emit white light, which 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 emitted by each sub-pixel 310 can pass through a microlens structure 22a composed of a color filter material. At this time, the microlens structure 22a can take into account the functions of the filter color filtering and the lens controlling the direction of light, so as to convert the white light into different colors of light 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 main light angle required by the optical imaging system.

[0151] It can be understood that since the microlens structure 22a in this embodiment is made of a color filter material, on the one hand, it can reduce the risk of light cross-talk caused by the large distance between the filter structure and the microlens structure 22a, and on the other hand, it can avoid the need to set up a filter layer 23, thereby reducing the components of the micro display screen 1000, which is beneficial to improving the structural compactness of the micro display screen 1000.

[0152] The micro display screen 1000 of this embodiment is prepared according to the following steps:

[0153] The transparent curved surface layer 10 is formed by a nano-imprinting process or an injection molding process;

[0154] A microlens array layer 20 is formed by a nanoimprint process with a support layer 21 as the base and a plurality of microlens structures 22a arranged in an array on the support layer 21;

[0155] 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.

[0156] Specifically, the microlens array layer 20 of the micro display screen 1000 of this embodiment is prepared according to the following steps:

[0157] Step 1: providing a mask plate, wherein a groove is formed in the mask plate for accommodating the raw material of the microlens array layer 20 to be injected, and a barrier layer is provided in the groove to block and form a plurality of mutually isolated recessed portions in the groove, and to prevent the plurality of recessed portions from penetrating and affecting each other; the plurality of recessed portions are arranged in an array, and the bottom shape of the recessed portions is adapted to the outer contour of the microlens structure 22a.

[0158] Step 2: Prepare the microlens array 22; the specific operation is: uniformly inject the raw material of the microlens array 22 into the mask through an inkjet printing process, the raw material can be set as a color filter material, specifically including a photocurable resin, a photoinitiator, a dye, a photosensitive resin composition, etc., and then cure the raw material to obtain a plurality of microlens structures 22a correspondingly distributed in a plurality of recessed portions through preliminary curing, and the microlens array 22 is composed of the plurality of microlens structures 22a.

[0159] Step three: prepare the support layer 21; the specific operation is: inject a layer of raw material of the support layer 21 into the mask plate evenly by spin coating or inkjet printing process, so that the raw material fills the top of the recessed portion. The raw material can be set to PDMS, PMMA, epoxy resin and other heat-curable or UV-curable materials, and then the raw material is cured to form a deformable support layer 21 on the side of the filter layer 23 away from the microlens array 22, so that the microlens array layer 20 can be prepared in the groove of the mask plate.

[0160] Step 4: Obtain the microlens array layer 20 ; the specific operation is: peel off 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 6.

[0161] Furthermore, after the microlens array layer 20 is prepared, a layer of adhesive may 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.

[0162] The transparent curved layer 10 may be adhered and fixed to the surface of the encapsulation layer 400 which is away from the pixel layer 300 , thereby the micro display device 100 may be prepared.

[0163] Embodiment 4:

[0164] like Figure 5 As shown, the micro display screen 1000 is a silicon-based OLED full-color device. Specifically, the micro display screen 1000 includes a base layer 200, a pixel layer 300, and an encapsulation layer 400 arranged in sequence from bottom to top. The micro display screen 1000 is arranged on the side of the encapsulation layer 400 away from the pixel layer 300, and is provided with a transparent curved surface layer 10 and a micro lens array layer 20 in sequence from bottom to top. Among them, the micro lens array layer 20 specifically includes a support layer 21 and a micro lens array 22 arranged on a filter layer 23, and the micro lens array 22 includes a plurality of micro lens structures 22a arranged in an array.

[0165] In this embodiment, since the micro display screen 1000 can realize full-color display based on independent light emission of RGB three colors, there is no need to set up a filter layer 23 for color filtering. It is only necessary to modulate the transmission direction of the light through the transparent curved layer 10 and the microlens array layer 20 of the micro display screen 1000 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 main light angle required by the optical imaging system.

[0166] The micro display screen 1000 of this embodiment is prepared according to the following steps:

[0167] The transparent curved surface layer 10 is formed by a nano-imprinting process or an injection molding process;

[0168] A microlens array layer 20 is formed by a nanoimprint process with a support layer 21 as the base and a plurality of microlens structures 22a arranged in an array on the support layer 21;

[0169] 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.

[0170] The transparent curved layer 10 may be adhered and fixed to a surface of the encapsulation layer 400 facing away from the pixel layer, thereby preparing the micro display device 100 .

[0171] The above are only exemplary embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A micro display screen, characterized in that: include: Pixel layer; A transparent curved surface layer, the transparent curved surface layer is arranged on the light-emitting side of the pixel layer, a surface of the transparent curved surface layer on a side 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; as well as A microlens array layer is disposed on the curved surface.

2. The micro display screen according to claim 1, characterized in that: The microlens array layer comprises: A support layer, wherein the support layer is deformable and configured to be attached to the curved surface; and A microlens array, wherein the microlens array comprises a plurality of the microlens structures, and the plurality of the microlens structure arrays are arranged on a side of the support layer away from the transparent curved surface layer.

3. The micro display screen according to claim 2, characterized in that: 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.

4. The micro display screen as claimed in claim 2, characterized in that: The microlens array layer further comprises a filter layer, wherein the filter layer comprises a plurality of color filter structures, each of which is disposed between one of the microlens structures and the support layer; And / or, the micro display screen further comprises a filter layer, the filter layer is arranged between the pixel layer and the transparent curved surface layer, the filter layer comprises a plurality of color filter structures, and each of the color filter structures is arranged corresponding to each sub-pixel of the pixel layer; And / or, the microlens structure is made of a color filter material.

5. The micro display screen according to any one of claims 1 to 4, characterized in that: The micro display screen further comprises a planarization layer, which is arranged on a side of the micro lens array layer away from the transparent curved surface layer, and the refractive index of the planarization layer is smaller than the refractive index of the micro lens structure; And / or, the microlens array layer includes a plurality of microlens structures, and each of the microlens structures is arranged corresponding to each sub-pixel of the pixel layer.

6. A method for preparing a micro display screen according to any one of claims 1 to 5, characterized in that: The steps include: Prepare a transparent curved surface layer, wherein one side of the transparent curved surface 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; A microlens array layer is prepared, and the microlens array layer is transferred onto the curved surface of the transparent curved surface layer.

7. The preparation method according to claim 6, characterized in that: The step of preparing the microlens array layer comprises: Provide mask plates; Injecting raw materials of the microlens array into the mask plate and solidifying it to form the microlens array; Injecting a raw material of a support layer into the mask plate, and solidifying the support layer on the microlens array to form a microlens array layer; The mask and the microlens array layer are separated.

8. The preparation method according to claim 7, characterized in that: Before the step of injecting the raw material of the support layer into the mask and solidifying the support layer on the microlens array to form the microlens array layer, the method further includes: The raw material of the color filter is injected into the mask plate and solidified on the microlens array to form a filter layer.

9. The preparation method according to claim 6, characterized in that: The step of transferring the microlens array layer onto the curved surface of the transparent curved surface layer comprises: Applying adhesive on the curved surface of the transparent curved surface layer; The microlens array layer is adhered to the curved surface of the transparent curved surface layer.

10. A display device, characterized in that: It comprises the micro display screen as described in any one of claims 1 to 5.

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