Fresnel lens curtain

Abstract

The utility model discloses a Fresnel lens curtain, and aims to overcome the defect that contradiction exists between the anti-light effect and the screen brightness of the conventional Fresnel curtain. The utility model sequentially comprises an outer layer, a micro-structure layer, a Fresnel lens layer and a reflecting layer, a base film layer is arranged among the outer layer, the micro-structure layer and the Fresnel lens layer, the micro-structure layer is attached to the upper base film layer through an attaching adhesive layer, the top surface of the micro-structure layer is in a continuous peak shape, a light absorber is arranged in the attaching adhesive layer, and the reflecting layer is arranged between the outer layer and the micro-structure layer. The attaching adhesive layer can absorb light except for the three-primary-color wavelength. The horizontal visual angle of the Fresnel lens is increased through the microstructure layer, and light rays except for three primary colors generated by a light source of laser projection are absorbed by the fitting adhesive layer, so that the light resistance is improved.

Description

Technical Field

[0001] The utility model relates to the field of audio - visual equipment, and more specifically, it relates to a Fresnel lens screen. Background Technique

[0002] In recent years, the rapid development of the domestic audio - visual market has driven the continuous growth of the projection screen market. As the terminal of the projection system, the projection screen has become more and more familiar to people with the improvement of projection technology and the popularization of projectors in education, engineering, commerce, home and other aspects. As a way of presenting the picture, the choice of screen type has a great impact on the final projection effect of audio - visual.

[0003] Nowadays, more users like to watch projection pictures under relatively bright ambient light. However, the surface of the screen is easily affected by ambient light, resulting in a white, unclear and uneven imaging picture. Therefore, it will greatly reduce the contrast and brightness of the picture and fail to achieve its own display or demonstration effect. In addition, the Fresnel lens screen also has the problem of a small viewing angle.

[0004] At present, the mainstream solution of the reported screen is the Fresnel anti - glare screen. Its main principle is to use the refraction and reflection characteristics of the Fresnel lens to focus the light emitted by the projector in a specific area, so as to achieve a high - contrast and high - brightness projection effect.

[0005] The current production method of the Fresnel anti - glare screen consists of an upper - layer linear structure or ordinary diffusion or hardening structure, an intermediate color layer, and a back - side Fresnel structure and reflection layer. It is necessary to adjust the color layer to achieve the anti - light and contrast effects. If you want a good anti - light effect, you need to reduce the transmittance of the color layer and deepen the color layer, which will result in the loss of screen brightness and RGB imbalance (color imbalance). Although the Fresnel structure has a high - gain effect, the horizontal viewing angle is relatively low. Summary of the Invention

[0006] The utility model overcomes the deficiency that if you want a good anti - light effect for the existing Fresnel screen, you need to reduce the transmittance of the color layer and deepen the color layer, which will cause the light transmittance degradation of the color layer, loss of screen brightness and RGB imbalance, and cannot make the anti - light effect of the screen better on the premise of ensuring the screen brightness. The utility model provides a Fresnel lens screen which can produce a Fresnel screen with good anti - light effect, a larger viewing angle, sufficient RGB accuracy and sufficient gain.

[0007] To solve the above - mentioned technical problems, the utility model adopts the following technical solutions:

[0008] A Fresnel lens screen successively includes an outer layer, a microstructure layer, a Fresnel lens layer and a reflective layer. A base film layer is provided between the outer layer, the microstructure layer and the Fresnel lens layer. The microstructure layer is adhered to the upper base film layer through an adhesive layer. The top surface of the microstructure layer is in the shape of continuous mountains. The adhesive layer is provided with a light absorbent, and the adhesive layer can absorb light other than the wavelengths of the three primary colors.

[0009] The outer layer is generally a hardening layer, which plays a role in protecting the internal optical structure. Its surface generally has a micro-concave-convex structure for improving the light diffusion effect. In addition, a striped linear structure can be provided to improve the viewing angle. The setting of the outer layer has been fully disclosed in the related art. The key point of this application is not to improve the outer layer, so it will not be described in detail.

[0010] The microstructure layer is used to expand the viewing angle. The light converged by the Fresnel lens is diffused to both sides of the mountains by the continuous mountains to increase the viewing angle range.

[0011] The light absorbent in the adhesive layer absorbs light other than the three primary colors, making the screen look particularly black visually, increasing the anti-light effect and not losing the brightness gain of the screen.

[0012] The adhesive layer is adhered to the top surface of the microstructure layer, filling the continuous mountains on the top surface of the microstructure layer. This structure can improve the ability of the adhesive layer to absorb stray light on the premise of a certain thickness. The base film layer is provided between the outer layer and the adhesive layer, as well as between the microstructure layer and the Fresnel lens layer.

[0013] By replacing the color layer with the microstructure layer and the adhesive layer, both high gain and ultra-high anti-light effect can be achieved, the horizontal viewing angle can be expanded, enabling users to view the projection image clearly and evenly in a relatively bright ambient light, without significantly reducing the contrast and brightness of the image, and expanding the horizontal viewing angle.

[0014] Preferably, the normal line of the valley formed at the lowest part between adjacent mountains is perpendicular to the Fresnel lens layer. This structure enables the light to be diffused equally to both sides relative to the central axis of the screen through the microstructure layer, avoiding uneven brightness of the image in the left and right directions.

[0015] Preferably, when the Fresnel lens screen is in a preset use state, the ridges on the top surface of the microstructure layer are arranged in the height direction. This structure enables the light to be diffused to both sides, expanding the horizontal viewing angle.

[0016] Preferably, the angle of the peak tip of the mountain is 115 - 125°.

[0017] Preferably, each mountain has the same width.

[0018] Preferably, the distance between adjacent peak tips is 30 - 150um.

[0019] Preferably, the surface of the microstructure layer has a number of pits. This structure improves the atomization effect.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] (1) The horizontal viewing angle of the Fresnel lens is improved through the microstructure layer;

[0022] (2) The adhesive layer is used to absorb the light source of the laser projection to generate light rays other than the three primary colors, improving the light resistance performance. Description of the Drawings

[0023] Figure 1 is a schematic diagram of the present utility model;

[0024] Figure 2 is a schematic diagram of the microstructure layer and the Fresnel lens layer of the present utility model;

[0025] Figure 3 is a schematic cross-sectional view of the microstructure layer of the present utility model;

[0026] In the figure:

[0027] Outer layer 1, microstructure layer 2, Fresnel lens layer 3, reflective layer 4, base film layer 5, peak 6, valley 7, pit 8, adhesive layer 9. Detailed Embodiments

[0028] The following further describes the present disclosure in conjunction with the drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further descriptions of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only relational terms determined for the convenience of describing the structural relationship of each component or element of the present disclosure and do not specifically refer to any component or element in the present disclosure. They should not be construed as limiting the present disclosure.

[0032] In the present disclosure, terms such as "fixed connection", "connected", "connected to" should be understood in a broad sense, which may mean a fixed connection, an integral connection or a detachable connection; it may be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and it should not be construed as a limitation to the present disclosure.

[0033] Embodiment:

[0034] A Fresnel lens curtain, referring to Figure 1 as shown, successively includes an outer layer 1, a microstructure layer 2, a Fresnel lens layer 3 and a reflective layer 4.

[0035] The outer layer 1 is generally a hardening layer, which plays a role in protecting the internal optical structure. Its surface generally has a micro random concave-convex structure for improving the light diffusion effect. In addition, a striped linear structure can also be set to improve the viewing angle. The setting of the outer layer 1 has been fully disclosed in the related art. The application key point of this application is not to improve the outer layer 1, so it will not be described in detail.

[0036] Referring to Figure 2 、 3 as shown, the top surface of the microstructure layer 2 is in a continuous mountain shape. The continuous mountain shape means that there are several pits 8, and the adjacent pits 8 are connected so that the connection part forms not a platform but a peak tip with a downward concave arc-shaped side wall. The normal line of the valley 7 formed at the lowest part between adjacent mountains 6 is perpendicular to the Fresnel lens layer 3. This structure enables the light to be diffusely spread relatively equally to both sides along the central axis of the curtain through the microstructure layer 2, avoiding uneven picture brightness in the left and right directions. When the Fresnel lens curtain is in the preset use state, the ridge of the top surface of the microstructure layer 2 is arranged in the height direction, where the ridge refers to the connection line formed by the peak tips. This structure enables the light to be diffusely spread to both sides, expanding the horizontal viewing angle. The angle of the peak tip of the mountain 6 is 115 - 125°. Each mountain 6 has the same width. The distance between adjacent peak tips is 30 - 150um. The surface of the microstructure layer 2 has several pits 8. This structure improves the atomization effect. In some embodiments, the pits 8 are formed by shot peening to improve the haze, and a haze of 40% - 60% is obtained. The microstructure layer 2 is used to expand the viewing angle, and the light converged by the Fresnel lens is diffusely spread to both sides of the mountain 6 by the continuous mountain to expand the viewing angle range.

[0037] A light absorber is provided in the bonding adhesive layer 9, and the bonding adhesive layer 9 can absorb light other than the three primary colors. The light absorber in the bonding adhesive layer 9 absorbs light other than the three primary colors, so that the screen can look particularly black visually, increase the light resistance effect, and will not lose the brightness gain of the screen. Among them, the three primary colors refer to the red, yellow and blue light generated by the light source of the projection host, and the wavelengths of the three primary colors are 463nm for blue, 527nm for green, and 638nm for red. The light absorber is purchased from TORAY Co., Ltd. of Japan, and the bonding adhesive is obtained by mixing the light absorber with the resin.

[0038] The reflective layer 4 has a high reflectivity and includes a metal coating coated on the bottom surface of the Fresnel lens layer 3. After the light passes through the layers above the reflective layer 4 and reaches the reflective layer, it is reflected back into the Fresnel lens 3 and refracted to emit the light in a direction approximately in front of the curtain.

[0039] A base film layer 5 is provided between the outer layer 1, the microstructure layer 2 and the Fresnel lens layer 3, and the microstructure layer 2 is bonded to the upper base film layer 5 via a bonding adhesive layer 9. The base film layer 5 is provided between the outer layer 1 and the bonding adhesive layer 9, and between the microstructure layer 2 and the Fresnel lens layer 3.

[0040] Ginseng Figure 3 As shown, the bonding adhesive layer 9 fills the continuous peaks on the top surface of the microstructure layer 2, that is, fills the gap between the peaks 6 on the top of the microstructure layer 2 and the upper base film layer 5. In addition to protecting the surface structure of the microstructure layer 2, this structure can also improve the bonding adhesive layer 9's ability to absorb stray light at a certain thickness: because the bonding adhesive layer 9 is filled in the adjacent peaks 6, that is, the aforementioned pits 8, when the light diverges from both sides of the peaks 6 through the structure of the microstructure layer 2, it passes through the bonding adhesive layer 9 obliquely, extending the passing path, and the bonding adhesive layer 9 can more fully absorb the stray light therein, thereby improving the light resistance effect. In order to further illustrate the benefits of the bonding adhesive layer 9 being arranged above the microstructure layer 2, a comparative example in which the bonding adhesive layer 9 is filled in the lower layer of the microstructure is provided. In the comparative example, the path of light passing through the bonding adhesive layer 9 is equivalent to the thickness of the bonding adhesive layer 9. Compared with the embodiment of the present application, under the premise of a certain thickness, the path of light passing through the bonding adhesive layer 9 is shorter and the light resistance is weaker. In addition, since the bonding adhesive layer 9 fills the surface structure of the microstructure layer 2, its thickness is equivalent to being increased, which can improve the light resistance under the premise of a certain overall thickness. The light resistance effect is greater than 93% without losing the brightness gain of the screen.

[0041] The same laser projection device is used to test the conventional solution in the background technology, the comparative solution of reducing the light transmittance of the color layer to improve the response of the conventional solution, and the present embodiment, and the various parameters obtained are as follows:

[0042] Test scheme Conventional scheme Comparison scheme This embodiment Peak gain at the center point 1.63 1.98 1.91 Light resistance 85.94% 81.30% 94.20% Uniformity 70.00% 70.00% 70.00% Horizontal 1 / 2 viewing angle 21 21 27

[0043] It can be seen that by replacing the color layer with the microstructure layer 2 and the bonding adhesive layer 9, both high gain and ultra-high anti-light effect can be achieved, the horizontal viewing angle can be expanded, enabling users to view the projection screen clearly and evenly under relatively bright ambient light, without significantly reducing the contrast and brightness of the screen, and expanding the horizontal viewing angle.

[0044] The above-described embodiments are only preferred solutions of the present utility model and do not impose any form of limitation on the present utility model. There are other variations and modifications without exceeding the technical solutions recited in the claims.

Claims

1. A Fresnel lens screen, characterized in that: It includes an outer layer, a microstructure layer, a Fresnel lens layer and a reflective layer in sequence. A base film layer is provided between the outer layer, the microstructure layer and the Fresnel lens layer. The microstructure layer is bonded to the upper base film layer through a bonding adhesive layer. The top surface of the microstructure layer is in a continuous mountain shape. A light absorber is provided in the bonding adhesive layer. The bonding adhesive layer can absorb light other than the three primary color wavelengths.

2. A Fresnel lens screen according to claim 1, characterized in that: The normal of the valley formed by the lowest point between adjacent peaks is perpendicular to the Fresnel lens layer.

3. A Fresnel lens screen according to claim 2, characterized in that: When the Fresnel lens screen is in a preset use state, the ridges on the top surface of the microstructure layer are arranged along the height direction.

4. The Fresnel lens screen according to claim 1, characterized in that: The angle of the peak is 115-125°.

5. The Fresnel lens screen according to claim 1, characterized in that: All the peaks are of equal width.

6. The Fresnel lens screen according to claim 5, characterized in that: The distance between adjacent peaks is 30-150um.

7. A Fresnel lens screen according to any one of claims 1 to 6, characterized in that: The surface of the microstructure layer has a plurality of pits.

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