Naked eye 3D display microlens grating array structure, display device and preparation method thereof

Abstract

The invention provides a naked-eye 3D display micro-lens grating array structure, a display device and a preparation method thereof, and belongs to the technical field of naked-eye 3D display. The problems of human dizziness and the like caused by parallax generated when naked eye 3D is realized by adopting a micro lens at present are solved. The naked eye 3D display micro-lens grating array structure comprises a transparent substrate, a plurality of micro-lenses are arranged on the transparent substrate, and a grating array is arranged on the curved surface of each micro-lens. And the micro lens is in a convex shape. And the micro lens is made of a polydimethylsiloxane material. The grating array is composed of a series of arranged grooves or protrusions, and the size of the grooves or protrusions and the distance between every two grooves or protrusions are within the micrometer or nanometer scale range. The method is applied to naked eye 3D display.

Description

Technical Field

[0001] The present invention provides a naked-eye 3D display microlens grating array structure, a display device and a preparation method thereof, and belongs to the technical field of naked-eye 3D display. Background Art

[0002] Naked-eye 3D is a general term for technologies that achieve stereoscopic visual effects without the help of external tools such as polarized glasses. Representative technologies of this type mainly include light barrier technology and cylindrical lens technology. Currently, naked-eye 3D display devices are generally implemented using microlenses, but the light emitted by the microlenses alone has an asymmetric problem in the image after entering the left and right eyes of a person, causing parallax and causing dizziness.

[0003] Microlens array is an array structure composed of many tiny lenses, which can be arranged into a regular two-dimensional array. Microlens array can be used to increase the resolution of optical systems and improve imaging quality.

[0004] Micro-nano grating is an optical element with a periodic structure at the micron and nanometer level. It consists of a series of parallel grooves or protrusions, the size and spacing of which are very small, usually in the micron or nanometer range.

[0005] Therefore, the present invention proposes to prepare a microlens grating array by combining a microlens array with a micro-nano grating, and place it at the light output point of the Mini / Micro LED display, combining the advantages of both to achieve light focusing, separation, deflection and modulation, improve the brightness and contrast of the display, and realize the naked-eye 3D display function. Summary of the invention

[0006] In order to solve the problem that the current use of microlenses to realize naked-eye 3D will cause parallax and cause dizziness, the present invention proposes a naked-eye 3D display microlens grating array structure, a display device and a preparation method thereof.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: a naked-eye 3D display microlens grating array structure, including a transparent substrate, a plurality of microlenses are arranged on the transparent substrate, and a grating array is provided on the curved surface of each microlens.

[0008] The microlens is convex in shape.

[0009] The microlens is made of polydimethylsiloxane material, namely PDMS material.

[0010] The grating array is composed of a series of arranged grooves or protrusions, and the size of the grooves or protrusions and the intervals between them are in the range of micrometer or nanometer scale.

[0011] A naked-eye 3D display device attaches a naked-eye 3D display microlens grating array structure in front of a Mini / Micro LED panel.

[0012] The Mini / Micro LED panel includes a PCB board and light-emitting units arranged on the PCB board, the light-emitting units use Mini / Micro RGB LED chips, the transparent substrate is attached to the light-emitting units, and the microlenses are located at the outermost side, and each microlens can cover the position of each group of Mini / Micro RGB LED chips.

[0013] The method for preparing a naked-eye 3D display microlens grating array structure comprises the following steps: S1: Prepare a grating template by photolithography and development process of the photoresist on the silicon wafer; S2: Spin-coat PDMS evenly onto the grating template, heat and cure it at high temperature, print out the grating structure, and prepare the PDMS grating film; S3: attaching the PDMS grating film to the support layer with a porous structure, and then placing it in a vacuum exhaust device, and performing a vacuum treatment on the side of the support layer where the PDMS grating film is not attached. The PDMS grating film adheres to the surface of the prefabricated plate under negative pressure, and at the opening of the porous structure, the PDMS grating film will further deform and form a curved groove; S4: Pour a polyurethane acrylate solution, i.e., a PUA solution, into the groove formed in step S3, place a transparent substrate on the PDMS grating film and contact it with the PUA solution, and separate the PUA solution from the PDMS grating film after curing to prepare a microlens grating array structure.

[0014] The transparent substrate with the microlens grating array structure prepared in step S4 is attached in front of the Mini / Micro LED panel to obtain a naked-eye 3D display device.

[0015] The thickness of the PDMS grating film is 100-500um.

[0016] The PDMS curing condition is heating at 100-150° C. for 10-40 minutes; The PUA solution is cured by ultraviolet light irradiation.

[0017] The beneficial effects of the present invention compared with the prior art are as follows: 1. By combining microlenses and gratings, better functions of focusing, separating, deflecting and modulating light can be achieved; 2. The microlens grating array structure is combined with Mini / Micro LED display technology to regulate the light function at the pixel size, solving the problem of crosstalk and dizziness caused by different parallax images when one eye and two eyes focus on the image plane. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 A schematic diagram of the structure of a grating template prepared by a photolithography and development process; Figure 2 A schematic diagram of a three-dimensional structure of a grating template prepared by a photolithography and development process; Figure 3 Schematic diagram of the structure of PDMS spin-coated onto the grating template; Figure 4 It is a schematic diagram of the structure of the PDMS grating film; Figure 5 Schematic diagram of the three-dimensional structure of the PDMS grating film; Figure 6 A schematic diagram of a structure at the opening of the support layer; Figure 7 It is a schematic diagram of the structure in which the PDMS grating film is attached to the support layer; Figure 8 It is a schematic diagram of the three-dimensional structure of the vacuum pumping device; Fig. 9 It is a schematic diagram of the structure of the vacuum deformation of the PDMS grating film; Fig.10 Schematic diagram of the structure of pouring PUA solution into the groove on the curved surface of PDMS grating film; Fig.11 Schematic diagram of the structure of placing a glass plate on the PDMS grating film and solidifying the PUA solution; Fig.12 is a schematic diagram of the structure of a microlens grating array; Fig.13 It is a schematic diagram of the structure of a microlens grating array applied to naked-eye 3D display; In the figure: 101-silicon wafer; 102-grating template; 2-PDMS; 3-support layer; 4-vacuum exhaust device; 5-PUA solution; 6-transparent substrate; 701-PCB board; 702-light-emitting unit. DETAILED DESCRIPTION

[0019] like Figures 1 to 13 As shown, the present invention provides a naked-eye 3D display microlens grating array structure, including a transparent substrate 6, on which a plurality of microlenses are arranged, and a grating array is provided at the curved surface of each microlens.

[0020] The microlens is convex in shape.

[0021] The microlens is made of polydimethylsiloxane material.

[0022] The grating array consists of a series of arranged grooves or protrusions, and the size and spacing of these grooves or protrusions are in the micrometer or nanometer range.

[0023] The present invention also proposes a naked-eye 3D display device, in which a naked-eye 3D display microlens grating array structure is attached in front of a Mini / Micro LED panel.

[0024] The Mini / Micro LED panel includes a PCB board 701 and light-emitting units 702 arranged on the PCB board 701, the light-emitting units 702 use Mini / Micro RGB LED chips, the transparent substrate 6 is attached to the light-emitting units 702, and the microlenses are located at the outermost side, and each microlens can cover the position of each group of Mini / Micro RGB LED chips.

[0025] The present invention also provides a method for preparing a naked-eye 3D microlens grating array structure, the method comprising the following steps: S1: preparing a grating template 102 by a photolithography and development process on the photoresist on the silicon wafer 101.

[0026] S2: Spin-coat polydimethylsiloxane (PDMS) uniformly onto the grating template 102, heat and cure it at high temperature, print out the grating structure, and prepare a PDMS grating film.

[0027] S3: Attach the PDMS grating film to the support layer 3 with a porous structure, place it in a vacuum exhaust device 4, and perform vacuum treatment on the side of the support layer 3 where the PDMS grating film is not attached. The PDMS grating film adheres to the surface of the support layer 3 under negative pressure, and at the opening of the porous structure, the PDMS grating film will be further deformed and form a curved groove.

[0028] S4: Pour a polyurethane acrylate (PUA) solution into the groove, place a transparent glass plate 6 on the PDMS grating film and contact it with the PUA solution 5, and separate the PUA solution 5 from the PDMS grating film after solidification to prepare a microlens grating array structure.

[0029] The transparent substrate 6 with the microlens grating array structure prepared in step S4 is attached to the front of the Mini / Micro LED panel to obtain a naked-eye 3D display device. Fig.13 As shown, each microlens can cover the position of each group of Mini / Micro RGBLED chips.

[0030] Furthermore, the grating structure can be changed by adjusting the photolithography and development process.

[0031] Furthermore, the PDMS curing conditions are 100-150° C. and heating for 10-40 minutes.

[0032] Furthermore, the size, shape and position of the openings of the porous structure in the support layer 3 are all designed and prepared in advance.

[0033] Furthermore, the amount of protrusion deformation of the PDMS grating film at the opening of the pore structure is determined by the thickness of the polydimethylsiloxane film, the vacuum pressure, and the size and shape of the opening of the porous structure.

[0034] Furthermore, the thickness of the PDMS grating film ranges from 100 to 500 um.

[0035] Furthermore, the PUA solution 5 is cured by ultraviolet light irradiation.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A naked-eye 3D display microlens grating array structure, characterized in that: It comprises a transparent substrate on which a plurality of micro lenses are arranged, and a grating array is arranged on the curved surface of each micro lens.

2. The naked-eye 3D display microlens grating array structure according to claim 1, characterized in that: The microlens is a convex lens.

3. The naked-eye 3D display microlens grating array structure according to claim 2, characterized in that: The microlens is made of polydimethylsiloxane material, namely PDMS material.

4. The naked-eye 3D display microlens grating array structure according to claim 1, characterized in that: The grating array is composed of a series of arranged grooves or protrusions, and the size of the grooves or protrusions and the intervals between them are in the range of micrometer or nanometer scale.

5. A naked-eye 3D display device, characterized in that: Attach the naked-eye 3D display microlens grating array structure described in any one of claims 1 to 4 in front of the Mini / Micro LED panel.

6. The naked-eye 3D display device according to claim 5, characterized in that: The Mini / Micro LED panel includes a PCB board and light-emitting units arranged on the PCB board, the light-emitting units use Mini / Micro RGB LED chips, the transparent substrate is attached to the light-emitting units, and the microlenses are located at the outermost side, and each microlens can cover the position of each group of Mini / Micro RGB LED chips.

7. A method for preparing a naked-eye 3D display microlens grating array structure according to any one of claims 1 to 4, characterized in that: The steps include: S1: Prepare a grating template by photolithography and development process of the photoresist on the silicon wafer; S2: Spin-coat PDMS evenly onto the grating template, heat and cure it at high temperature, print out the grating structure, and prepare the PDMS grating film; S3: attaching the PDMS grating film to a support layer with a porous structure, and then placing it in a vacuum pumping device, and performing a vacuum treatment on the side of the support layer where the PDMS grating film is not attached. The PDMS grating film adheres to the surface of the support layer under negative pressure, and at the opening of the porous structure, the PDMS grating film will further deform and form a curved groove; S4: Pour a polyurethane acrylate solution, i.e., a PUA solution, into the groove formed in step S3, place a transparent substrate on the PDMS grating film and contact it with the PUA solution, and separate the PUA solution from the PDMS grating film after curing to prepare a microlens grating array structure.

8. The method for preparing a naked-eye 3D display microlens grating array structure according to claim 7, characterized in that: The transparent substrate with the microlens grating array structure prepared in step S4 is attached in front of the Mini / Micro LED panel to obtain a naked-eye 3D display device.

9. The method for preparing a naked-eye 3D display microlens grating array structure according to claim 7 or 8, characterized in that: The thickness of the PDMS grating film is 100-500um.

10. The method for preparing a naked-eye 3D display microlens grating array structure according to claim 7 or 8, characterized in that: The PDMS curing condition is heating at 100-150° C. for 10-40 minutes; The PUA solution is cured by ultraviolet light irradiation.

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