High-definition projection curtain of large-breadth random micro convex-concave lens array

Abstract

The utility model discloses a high-definition projection curtain of a large-format random micro convex-concave lens array, which sequentially comprises a PET (polyethylene terephthalate) base material layer, a micro lens array layer, a metal reflecting layer and an imaging layer, and is characterized in that the micro lens array layer comprises a plurality of concave lenses and convex lenses which are distributed at random positions and have random heights; the concave lens is used for improving gain and reducing ambient light interference, and the convex lens is used for increasing a field angle. According to the utility model, the micro-lens array layer adopts the concave lenses and the convex lenses which are randomly distributed, so that compared with a micro-lens array which is regularly arranged, the micro-lens array layer can effectively resist interference of ambient light on a projection imaging picture, the imaging picture is clearer, the contrast ratio is higher, the gain is larger, and the micro-lens array layer has a larger field angle.

Description

Technical Field

[0001] The utility model relates to the technical field of projection display, in particular to a high-definition projection screen with a large-scale random micro-convex-concave lens array. Background Art

[0002] Projection screens are widely used in conference rooms, command centers, educational institutions, exhibition halls, and other occasions. However, in actual use, projection screens are often affected by strong light environments, especially bright environments, which can cause the image to be blurred and whitened. This whitening phenomenon can greatly reduce the contrast and brightness of the image, causing the image content to be lost, seriously affecting the user experience. Currently, anti-glare screens are available that can reduce the interference of ambient light on the projected image. However, there is a contradiction between the gain and field of view of existing anti-glare screens, that is, increasing the gain will lead to a narrower viewing angle, and increasing the viewing angle will lead to a decrease in gain. Therefore, there is a need for a high-definition projection screen that has both a large field of view and anti-ambient light effect. Utility Model Content

[0003] In order to solve the defects of the prior art, the utility model proposes a high-definition projection screen with a large-scale random micro-convex-concave lens array.

[0004] The utility model discloses a high-definition projection screen with a large-format random micro-convex-concave lens array, which comprises a PET substrate layer, a microlens array layer, a metal reflective layer and an imaging layer in sequence. The microlens array layer includes a plurality of concave lenses and convex lenses with random position distribution and random height. The concave lenses are used to increase gain and reduce ambient light interference, and the convex lenses are used to increase the field of view angle.

[0005] Preferably, the concave lens is a parabola, and the convex lens is a hyperbolic surface.

[0006] Preferably, the depth of the concave lens and the height of the convex lens are both within 5 μm.

[0007] Preferably, the microlens array layer is generated by laser direct writing 3D photolithography technology and is transferred and molded by UV adhesive. The thickness of the microlens array layer ranges from 10um to 20um.

[0008] Preferably, the PET substrate layer is made of a PET resin material with a light transmittance greater than 90%.

[0009] Preferably, the side of the PET substrate layer away from the projector is coated with a black matte coating material.

[0010] Preferably, the metal reflective layer is made of a metal material or a metal oxide material, and the thickness of the metal reflective layer is in the range of 40 nm to 80 nm.

[0011] Preferably, the imaging layer is made of a transparent or translucent material, which is any one of optical transparent glue, water-based varnish, glass, and transparent polyimide, and the thickness range of the imaging layer is 5um to 10um.

[0012] Preferably, the overall thickness of the high-definition projection screen is 0.5mm to 1.0mm.

[0013] The beneficial effects of the present utility model are as follows:

[0014] For the high-definition projection screen with a large-format random micro-convex and concave lens array of the present utility model, since the microlens array layer adopts randomly distributed concave lenses and convex lenses, compared with the regularly arranged microlens array, it can effectively resist the interference of ambient light on the projection imaging picture, making the imaging picture clearer, with higher contrast, greater gain, and a larger viewing angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0016] Figure 1 is the structural diagram of the high-definition projection screen with a large-format random micro-convex and concave lens array of the preferred embodiment of the present utility model.

[0017] Figure 2 is the structural schematic diagram of the microlens array layer of a preferred embodiment of the present utility model.

[0018] Figure 3 is the structural schematic diagram of the microlens array layer of another preferred embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0020] As Figure 1As shown in the figure, the high-definition projection screen of the large-format random micro-convex and concave lens array in the preferred embodiment of the present utility model sequentially includes a PET substrate layer 1, a microlens array layer 2, a metal reflection layer 3, and an imaging layer 4. The microlens array layer 2 includes a plurality of concave lenses 21 and convex lenses 22 randomly distributed in position and randomly in height. The concave lenses 21 are used to improve gain and reduce ambient light interference, and the convex lenses 22 are used to increase the viewing angle. Light from a projector or the like is incident on the projection screen of the present utility model from the imaging layer 4.

[0021] In each preferred embodiment, the concave lens 21 has a parabolic surface, and the convex lens 22 has a hyperbolic surface. In this application, the concave lens and the convex lens respectively adopt an aspherical design. Compared with spherical lenses, spherical aberration can be effectively corrected and aberration can be reduced, thereby improving the clarity and accuracy of the image. Preferably, the microlens array layer 2 is randomly and alternately formed by an array of convex lenses and an array of concave lenses. The depths of the concave lenses and the heights of the convex lenses are randomly distributed within 5 μm. That is, based on the interface between the convex lens and the concave lens, the distance from the highest point of the convex lens 22 to the interface does not exceed 5 micrometers, and the distance from the lowest point of the concave lens 21 to the interface does not exceed 5 micrometers. The thickness range of the microlens array layer is 10 μm to 20 μm. Preferably, the minimum distance between adjacent two microlenses in the microlens array layer 2 is 5 μm to 50 μm, preferably 10 μm. As Figures 2-3 shown is a schematic structural diagram of the microlens array layer in the preferred embodiment of the present utility model, Figure 2 in which, the bottom surface shape of the concave lens 21 or the convex lens 22 is circular, Figure 3 in which, the bottom surface shape of the concave lens 21 or the convex lens 22 is square. Figure 3 The duty cycle of the microlens array layer in Figure 2 is higher than that of the microlens array layer in

[0022] As a result, the screen has higher brightness and contrast, as well as a larger viewing angle and higher resolution. Here, the duty cycle refers to the ratio of the light-transmitting area to the total area in the lens layer.

[0023] In each preferred embodiment, the PET substrate layer 1 is made of PET resin material with a light transmittance greater than 90%. A black matte coating material is coated on the side of the PET substrate layer 1 away from the projector.

[0024] In each preferred embodiment, the metal reflection layer 3 is made of a metal material or a metal oxide material, and the thickness range of the metal reflection layer 3 is 40 nm to 80 nm. Preferably, the metal material can be aluminum or silver, and materials such as aluminum and silver can be deposited on the microlens array layer 2 by methods such as vacuum evaporation, magnetron sputtering, and electroplating to form the metal reflection layer 3. Since the thickness of the metal reflection layer 3 is very small, most of the light from the projector is reflected by the metal reflection layer 3 after entering from the imaging layer 4, and a part of the light still passes through the metal reflection layer 3 and enters the microlens array layer 2, and is absorbed by the black matte coating of the PET substrate layer 1.

[0025] In each preferred embodiment, the imaging layer 4 is made of a transparent or semi-transparent material, and the material is one of optical transparent glue, water-based varnish, glass, and transparent polyimide. The thickness range of the imaging layer 4 is 5 μm to 10 μm. Preferably, the imaging layer 4 is formed on the surface of the metal reflection layer 3 by a coating and printing process.

[0026] In each preferred embodiment, the overall thickness of the high-definition projection screen is 0.5 mm to 1.0 mm.

[0027] In summary, in the high-definition projection screen with a large-format random micro-convex and concave lens array of the present invention, the light from the projector irradiates on the projection screen, reaches the microlens array layer 2, and is processed by the randomly distributed concave lens array to obtain gain and reduce the interference of ambient light on imaging. The randomly distributed convex lens array can increase the viewing angle. Among them, the randomly distributed microlens array can scatter light in multiple directions, weaken specular reflection, prevent external light sources from entering the observer's line of sight, reduce glare and enhance the anti-ambient light ability. Moreover, the regularly arranged lens array is prone to light interference, resulting in bright spots or dark spots, while the random arrangement reduces interference, makes the reflected light more uniform, and improves visual consistency. Therefore, the high-definition projection screen with a large-format random micro-convex and concave lens array of the present invention can effectively reduce the influence of ambient light on the imaging picture, obtain a large viewing angle while increasing the gain, can greatly improve the quality of the projection picture, and solve the problems of blurred, distorted, and white projection screen pictures in the prior art.

[0028] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A high-definition projection screen with a large-format random micro-convex and concave lens array, characterized in that, It includes a PET substrate layer, a microlens array layer, a metal reflective layer and an imaging layer in sequence. The microlens array layer includes a plurality of concave lenses and convex lenses with random position distribution and random height. The concave lenses are used to increase gain and reduce ambient light interference, and the convex lenses are used to increase the field of view angle.

2. The high-definition projection screen of a large-format random micro-convex and concave lens array according to claim 1, wherein The concave lens is a parabola, and the convex lens is a hyperbolic surface.

3. The high-definition projection screen of a large-format random micro-convex and concave lens array according to claim 2, characterized in that, The depth of the concave lens and the height of the convex lens are both within 5 μm.

4. The high-definition projection screen of a large-format random micro-convex and concave lens array according to claim 3, characterized in that, The microlens array layer is generated by laser direct writing 3D photolithography technology and is formed by UV adhesive transfer printing. The thickness of the microlens array layer ranges from 10um to 20um.

5. The high-definition projection screen of a large-format random micro-convex and concave lens array according to claim 1, characterized in that The PET substrate layer is made of a PET resin material with a light transmittance greater than 90%.

6. The high-definition projection screen of a large-format random micro-convex and concave lens array according to claim 5, characterized in that The side of the PET substrate layer away from the projector is coated with a black matte coating material.

7. The high-definition projection screen of a large-format random micro-convex and concave lens array according to claim 1, characterized in that The metal reflective layer is made of a metal material or a metal oxide material, and the thickness of the metal reflective layer ranges from 40 nm to 80 nm.

8. The high-definition projection screen of a large-format random micro-convex and concave lens array according to claim 1, wherein, The imaging layer is made of a transparent or translucent material, which is any one of optically transparent adhesive, water-based varnish, glass and transparent polyimide. The thickness of the imaging layer is in the range of 5um to 10um.

9. The high-definition projection screen of a large-format random micro-convex and concave lens array according to claim 1, characterized in that, The overall thickness of the high-definition projection screen is 0.5 mm to 1.0 mm.

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