Medium and long focal length anti-light projection screen for orthographic projection and hoisting combination

Abstract

The invention relates to the technical field of projection screens, and provides a medium and long focus anti-light projection screen for orthographic projection and hoisting combination, which comprises a plurality of optical structure units arranged on a substrate in an array, and the optical structure units are defined by transverse separation parts and longitudinal separation parts with triangular cross sections. The transverse separation part forms an anti-light ridge, and a first inclined surface and a second inclined surface of the anti-light ridge are respectively used for directionally reflecting projection light to a viewing area and reflecting ambient light to a non-viewing area; and each optical structure unit is an arc-shaped concave surface extending from the longitudinal separation part of the optical structure unit and is used for diffusing reflected light in the horizontal direction so as to enlarge the visual angle. Through the integrated structure, the problems that a traditional screen is small in visual angle, four corners are dark and ambient light interference exists are effectively solved, meanwhile, the front projection mode and the hoisting mode can be compatible without turning over the screen, and the uniformity, the contrast ratio and the use convenience of images are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of projection screens, in particular to a medium-long focal length anti-light projection screen for combination of front projection and ceiling hanging. BACKGROUND

[0002] Traditional front projection screens, such as white plastic screens or bead screens, usually have a simple diffuse reflection structure on the surface. Such screens will uniformly scatter the incident light in all directions, resulting in a sharp decline in picture contrast and color saturation in strong ambient light, i.e. poor anti-light performance. Secondly, the brightness of the center area of the screen is much higher than that of the corners, resulting in poor picture uniformity.

[0003] In order to improve the anti-light performance, various structures of anti-light screens have appeared on the market. However, the existing anti-light screens still have the following shortcomings: 1. Many anti-light screens adopt a strong directional reflection structure in order to pursue high front gain and anti-light performance, which severely sacrifices the horizontal and vertical viewing angles of the screen. Once the audience deviates from the optimal viewing position directly in front of the screen, the picture brightness and color will be significantly attenuated. At the same time, the dark corner problem of the screen corners is still prominent, and the consistency of the center and edge brightness cannot be achieved.

[0004] 2. Traditional anti-light screens are usually optimized for a specific projection method, such as desktop front projection or ceiling hanging. When the user needs to change the projection method, for example, from desktop front projection to ceiling hanging, since the light path is upside down, the screen must also be physically flipped to obtain the correct optical effect, which brings inconvenience to the user.

[0005] 3. Some screens that attempt to improve both horizontal and vertical optical performance use multi-layer composite structures or complex manufacturing processes, which increase the manufacturing cost and process difficulty of the product, making it difficult to popularize on a large scale. SUMMARY

[0006] In order to help solve the above technical problems, the present application provides a medium-long focal length anti-light projection screen for combination of front projection and ceiling hanging, which adopts the following technical solution: A medium-long focal length anti-light projection screen for combination of front projection and ceiling hanging, comprising: a plurality of optical structure units, which are arrayed on a screen base by transverse and longitudinal separation parts; the transverse separation part has a triangular cross-section, forming an anti-light ridge; the triangular cross-section of the transverse separation part includes a first inclined surface and a second inclined surface; the first inclined surface is configured to direct reflect light from a preset projection angle to a viewing area; The second inclined surface is configured to direct reflect light from the ambient light direction to the non-viewing area. Each of the optical structure units is an arc-shaped concave surface extending from the first longitudinal partition to the second longitudinal partition, and the arc-shaped concave surface is used to diffuse reflected light in the horizontal direction.

[0007] Preferably, the triangular cross section of the transverse partition is an isosceles or right triangle, the triangular top end forms an anti-glare ridge parallel to the horizontal edge of the screen, and the first inclined surface and the second inclined surface intersect at the ridge line.

[0008] Preferably, the transverse partition and the longitudinal partition are arranged orthogonally on the screen surface.

[0009] Preferably, the arc-shaped concave surface is surrounded by two opposite inner side walls of adjacent longitudinal partitions and a middle concave surface between the two inner side walls, the two side edges of the middle concave surface are respectively connected to the two inner side walls in a circular arc transition, forming a continuous reflective curved surface.

[0010] Preferably, the vertical distance between the triangular top end and the screen is greater than the vertical distance between the opening edge line of the middle concave surface and the screen.

[0011] Preferably, the upper edge of the concave surface of the arc-shaped concave surface is integrated with the triangular base of the transverse partition above it, the lower edge of the concave surface is integrated with the triangular base of the transverse partition below it, and the first inclined surface and the second inclined surface form a reflective cavity.

[0012] In summary, the medium-long focal anti-glare projection screen of the present application, 1. The arc-shaped concave surface structure effectively increases the horizontal viewing angle and ensures the uniformity of picture brightness, 2. The triangular anti-glare ridge structure solves the problem of dark corners of traditional screens, and in combination with the black inclined surface at the top, improves the contrast ratio and the anti-environmental light capability.

[0013] The integrated structure of the present application makes the screen compatible with front projection, side projection and hanging multiple use modes without flipping, providing a wide viewing angle while enhancing the convenience of use. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a side view of the transverse partition of the present application; Figure 2 is a schematic diagram of the light path projected to the transverse partition in the side view of the transverse partition; Figure 3 is a front view of the arc-shaped concave surface of the present application; Figure 4 is a schematic diagram of the light path projected to the arc-shaped concave surface in the top view of the arc-shaped concave surface; Figure 5 is a front view of the optical structure unit of the present application; Figure 6 is a side view of the optical structure unit of the present application; Figure 7 is a front view of the screen of the present application; Figure 8 is a schematic view of the anti-light structure layer of the present application.

[0015] Reference signs: 1 - transverse partition; 2 - longitudinal partition; 3 - middle concave; 4 - opening edge line; 5 - anti-light ridge. DETAILED DESCRIPTION

[0016] The present application will be further described below with reference to the drawings, which are very clear to those skilled in the art in terms of structure and principle. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0017] The medium-long focus projector is usually suspended on the ceiling, and the light is irradiated from top to bottom on the screen with a small vertical angle. "Medium-long focus" means that the optical structure of the screen must be optimized for the projector with a long projection distance and a small light incidence angle (close to normal incidence), so as to efficiently capture and reflect these incident light.

[0018] The present application provides a medium-long focus anti-light projection screen for front projection combined with suspension. The screen effectively improves the viewing angle, uniformity and anti-environmental light capability through special optical structure design, is suitable for various projection modes (such as front projection, side projection and suspension), and does not need to turn over the screen.

[0019] Specifically includes: A plurality of optical structure units, the plurality of optical structure units are arrayed on the screen base body through the transverse partition 1 and the longitudinal partition 2; The transverse partition 1 has a triangular cross section, forming an anti-light ridge 5; The triangular cross section of the transverse partition 1 includes a first inclined surface (the first inclined surface is located at the lower side in the figure) and a second inclined surface (the second inclined surface is located at the upper side in the figure); The first inclined surface is configured to direct the light from the preset projection angle to the viewing area The second inclined surface is configured to direct the light from the environmental light direction to the non-viewing area; in the embodiment of the present application, the second inclined surface of the transverse partition can be painted black to reduce the interference of environmental light (especially light).

[0020] The optical structure unit, the transverse partition 1 and the longitudinal partition 2 are integrally formed, each optical structure unit is an arc-shaped concave surface extending from a first longitudinal partition (the first longitudinal partition is located on the left side in the figure) to a second longitudinal partition (the second longitudinal partition is located on the right side in the figure), and the arc-shaped concave surface is used for diffusing reflected light in the horizontal direction.

[0021] The triangular cross section of the transverse partition 1 is an isosceles or right triangle, the top end of the triangle forms an anti-light ridge 5 parallel to the horizontal edge of the screen, and the first inclined surface and the second inclined surface intersect at a ridge line. The transverse partition 1 and the longitudinal partition 2 are arranged orthogonally on the screen surface. The arc-shaped concave surface is surrounded by the opposite two inner side walls of the adjacent longitudinal partition 2 and the middle concave surface 3 between the two inner side walls, and the two side edges of the middle concave surface 3 are respectively connected to the two inner side walls in a circular arc transition (the inner side refers to the side close to the middle concave surface), forming a continuous reflection curved surface.

[0022] The vertical distance between the top of the triangle and the screen is equal to the vertical distance between the opening edge line 4 of the middle concave surface 3 and the screen. The upper edge of the concave surface of the arc-shaped concave surface is integrated with the bottom edge of the triangle of the transverse partition 1 located above it, the lower edge of the concave surface is integrated with the bottom edge of the triangle of the transverse partition 1 located below it, and the first inclined surface and the second inclined surface form a reflection cavity with the arc-shaped concave surface.

[0023] The integrated cavity structure of the present application ensures that the light emitted from the medium and long focal length projector and incident at a small angle is first reflected by the transverse partition 1 to the arc-shaped concave surface. Then, the arc-shaped concave surface diffuses the light in the horizontal direction, thereby widening the left and right viewing angles while maintaining high brightness.

[0024] Specifically, as shown in Figure 1 The cross section of the transverse partition 1 is triangular, and the top end of the triangle forms an anti-light ridge 5 parallel to the horizontal edge of the screen. The triangular cross section includes a first inclined surface and a second inclined surface, wherein the first inclined surface is used to direct reflect light from a preset projection angle to a viewing area, and the second inclined surface is used to direct reflect light from an ambient light direction to a non-viewing area, thereby achieving an anti-environmental light effect.

[0025] Figure 2 The light path diagram projected to the transverse partition 1 is shown. When the projection light is incident at a preset angle, the first inclined surface efficiently reflects it to the viewing area; and when the ambient light (such as the top light) is incident to the second inclined surface, it is reflected to the non-viewing area, avoiding interference with the projected picture.

[0026] The triangular cross section of the transverse partition 1 is preferably an isosceles triangle to ensure symmetry of the light path and reflection efficiency. The height of the anti-light ridge 5 needs to be designed to be higher than the adjacent structure (such as the longitudinal partition 2) to achieve a true anti-light effect.

[0027] As shown in Figure 3 , each optical structure unit is an arc-shaped concave surface extending from its first longitudinal partition to the second longitudinal partition. The arc-shaped concave surface is jointly surrounded by the opposite two inner side walls of the adjacent longitudinal partition 2 and the middle concave surface 3 between the two inner side walls. The two side edges of the middle concave surface 3 are respectively connected with the two inner side walls in a circular arc transition, forming a continuous reflective curved surface, which helps to diffuse the reflected light in the horizontal direction and increase the left and right viewing angles.

[0028] Figure 4 The schematic diagram (top view) of the light path projected onto the arc-shaped concave surface. The arc-shaped concave surface can diffuse the incident light in the horizontal direction, making the brightness of the middle and four corners of the screen basically consistent, solving the problem of traditional screen that the middle is bright and the four corners are dark, and at the same time, the visual angle of left and right viewing can be increased.

[0029] As shown in Figure 5 and Figure 6 , the front view and side view of the optical structure unit show the overall layout of the transverse partition 1, the longitudinal partition 2 and the middle concave surface 3. The transverse partition 1 and the longitudinal partition 2 are preferably arranged orthogonally to form a grid-like structure. The upper edge of the arc-shaped concave surface of each optical structure unit is integrated with the triangular base of the transverse partition 1 located above it, and the lower edge is integrated with the triangular base of the transverse partition 1 located below it. The first inclined surface, the second inclined surface and the arc-shaped concave surface jointly form a reflective cavity, enhancing the directional reflection and diffusion effect of light.

[0030] In the embodiments of the present application, the vertical distance between the triangular vertex of the transverse partition 1 and the screen is equal to the vertical distance between the opening edge line 4 of the middle concave surface 3 and the screen, so as to ensure the consistency of the light path and the reflection efficiency. The material is preferably a silver or gray base material with high reflectivity, and an anti-light coating is coated by printing process to further improve the contrast and color performance.

[0031] To further improve the environmental light resistance and contrast, the frame of the screen (as shown in Figure 7 ) is painted black at the topmost part, but does not affect the color of the bottom of the frame. When the environmental light (such as ceiling light) shines on the screen, the black frame absorbs part of the stray light and blocks the interference of the environmental light on the projected picture, making the projected image clearer.

[0032] From Figure 7As can be seen, the screen comprises a screen base body and a plurality of optical structure units arranged thereon. The optical structure units are arranged in an array on the screen base body through transverse partitions 1 and longitudinal partitions 2, forming a regular optical pattern. The transverse partitions 1 and the longitudinal partitions 2 are integrally formed, preferably by precise optical molding, and the base material can be selected from PVC, TPU or PET and the like, and the color can be silver, white or gray. In addition, the required optical coating can also be coated on the structure layer through a printing process to further optimize the optical performance.

[0033] The transverse partitions enable the light path to be reflected and directed to the viewing area, thereby solving the problem of dark corners of the conventional screen, and the light from the preset projection angle is absorbed by the black color to reduce interference, and the arc-shaped concave surface can diffuse the reflected light in the horizontal direction, thereby increasing the left and right viewing angles.

[0034] In summary, the screen of the present application combines the up-and-down privacy-enhancing and brightening structure (the transverse partitions) with the left-and-right concave arc-shaped structure (the longitudinal partitions and the arc-shaped concave surface), thereby achieving the following effects: Increased viewing angle: the arc-shaped concave surface diffuses the light in the horizontal direction, thereby significantly increasing the left and right viewing angles, and the brightness of the middle and the four corners of the screen is uniform.

[0035] Anti-environmental light: the triangular inclined surface of the transverse partitions directs the reflection of environmental light, and in combination with the black frame, effectively suppresses the interference of environmental light.

[0036] Compatible with multiple projection modes: whether it is front projection, side projection or hanging, good picture effect can be obtained, and the screen does not need to be flipped.

[0037] Integrated molding: through one-time molding by precise mold, the structure is stable, and the optical performance is consistent.

Claims

1. A medium-long throw front-of-the-lens light rejecting projection screen, characterized in that, The application relates to a screen structure, comprising: a plurality of optical structure units arranged in an array on a screen base body through transverse partitions and longitudinal partitions; the transverse partitions have triangular cross sections, forming light-resistant ridges; the triangular cross sections of the transverse partitions comprise first inclined surfaces and second inclined surfaces; the first inclined surfaces are configured to direct the reflection of light rays from preset projection angles to a viewing area; the second inclined surfaces are configured to direct the reflection of light rays from ambient light directions to a non-viewing area; the optical structure units, the transverse partitions and the longitudinal partitions are integrally formed, each of the optical structure units is an arc-shaped concave surface extending from a first longitudinal partition to a second longitudinal partition, and the arc-shaped concave surface is used for diffusing reflected light in a horizontal direction.

2. The medium-long throw front-of-house suspended anti-light projection screen according to claim 1, wherein, the triangular cross sections of the transverse partitions are isosceles or right-angled triangles, the top end of the triangle forms a light-resistant ridge parallel to the horizontal edge of the screen, and the first inclined surface and the second inclined surface intersect at a ridge line.

3. The medium-long throw front-of-house suspended anti-light projection screen according to claim 1, wherein, the transverse partitions and the longitudinal partitions are arranged orthogonally on the surface of the screen.

4. The medium-long throw front-of-house suspended anti-light projection screen according to claim 1, wherein, the arc-shaped concave surface is surrounded by two opposite inner side walls of adjacent longitudinal partitions and a middle concave surface between the two inner side walls, the two side edges of the middle concave surface are respectively connected to the two inner side walls in a circular arc transition mode, and a continuous reflection curved surface is formed.

5. The medium-long throw front-of-house suspended anti-light projection screen according to claim 4, wherein, the vertical distance between the top point of the triangle and the screen is equal to the vertical distance between the opening edge line of the middle concave surface and the screen.

6. The medium-long throw front-of-house suspended anti-light projection screen according to claim 1, wherein, the upper edge of the concave surface of the arc-shaped concave surface is integrally connected to the bottom edge of the triangle of the transverse partition above the arc-shaped concave surface, the lower edge of the concave surface is integrally connected to the bottom edge of the triangle of the transverse partition below the arc-shaped concave surface, and the first inclined surface and the second inclined surface surround the arc-shaped concave surface to form a reflection cavity.

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