Ultra-short-focus projection curtain

Abstract

The invention relates to an ultra-short-focus projection curtain. The ultra-short-focus projection curtain mainly comprises a bottom layer, a first intermediate layer, a second intermediate layer and a surface layer which are successively pasted from back to front. The bottom layer comprises a black glue layer. The first intermediate layer comprises a prism layer and a reflection layer. A plurality of strip-shaped tooth prisms with triangular cross sections are successively connected and arranged in parallel to form the front surface of the prism layer, and the strip-shaped tooth prisms extend along the horizontal direction. The reflection layer is a film and is tightly adhered to the prism surface of the strip-shaped tooth prisms. The second intermediate layer comprises a lens layer. A plurality of cylindrical convex lenses are connected in parallel to form the front surface of the lens layer. The surface layer includes a first diffusion layer whose rough surface is formed by a plurality of micro-particle-shaped projections, and the surface layer is doped with black dying ink. The ultra-short-focus projection curtain disclosed by the invention has the advantages that ultra-short distance projection is realized, the high gain is maintained, and a wide visual angle is also realized; in addition, the surface of the curtain is light resistant, anti-glare and scraping resistant, the black-white contrast is high, washing and cleaning are convenient, and the application value is extremely high.

Description

technical field [0001] The invention relates to the field of projection, in particular to an ultra-short-focus projection screen and an ultra-short-focus projection system. Background technique [0002] The projection screen is a tool for displaying images, videos, etc. in commercial advertising, teaching, office, home or theater entertainment, etc. Compared with LCD screens, the cost of LCD screens is high and difficult to carry and store when large-scale requirements are required. For example, when used in large-scale advertising panels, theater playback, and teaching screens, LCD screens larger than 50 inches are expensive, and It cannot be stored immediately when it is not in use. In addition, the long-term viewing of LCD screens is also likely to affect vision due to radiation, which is not conducive to human health; the projection screen of the same size does not have the above problems, and its cost is much lower than that of LCD screens. screen, but also easy to car...

AI Technical Summary

Problems solved by technology

[0004] 1. At present, most projection screens are susceptible to interference from external light such as sunlight and lights, and are only suitable for relatively dark occasions. For example, when teaching and demonstrating images, it is necessary to block indoor sunlight and lights to create an occasion that avoids light interference. , so that the use of projection screens is greatly limited, and because it is easily disturbed by external light, it presents low color saturation and low black-and-white contrast;

[0005] 2. Most of the traditional projection screens are suitable for long-distance projection, that is, the projector must be placed far away from the projection screen. The requirements for projection distance make the projection screen unsuitable for occasions with limited space, such as family entertainment. When the cinema screen is used, the viewing space distance of ordinary families cannot meet the needs of telephoto projection;

[0006] Chinese patent CN203825353U discloses a directional lightening and anti-environmental light projection screen for short-focus projection equipment, which includes a jagged transparent substrate on one side and a paint layer for projection imaging. The patented technology utilizes the jagged The reflective surface reflects the projection light projected from obliquely below to achieve the purpose of short-focus projection; however, on the one hand, this patented technology only relies on the jagged upper side to block the ambient light to avoid the interference of external light and anti-light effect Not obvious; on the other hand, its projection viewing angle is limited, and the effect of increasing the projection viewing angle cannot be achieved

In addition, the projection screen of this patent is made of hard board material, which does not have roll-out properties. When the screen is not in use, it cannot be rolled up, which takes up a lot of space and is not conducive to storage.

[0007] 3. The projection screens on the market generally have a contradiction between high gain and wide viewing angle. For example, the projection screen produced by Arizawa, Japan, has a maximum gain value of less than 0.6 under the requirement of maintaining a wide viewing angle, and requires High-energy, high-brightness projectors can achieve high-gain effects, so viewing costs are high, and the energy loss of projectors is large, which places high demands on projectors; on the other hand, while meeting high-gain requirements, the screen The viewing angle will be affected again

[0008] 4. At present, most of the projection screens are made of PPU material. When the PPU material is used as a projection screen, the rollability is not good. During the cleaning process, the projection screen is prone to scratches and damage;

[0009] 5. When watching the traditional projection screen, it is easy for the viewer's eyes to be affected by the glare on the surface, thus affecting the comfort of the viewer's eyes;

[0010] 6. The black and white contrast of the traditional projection screen is low, which affects the visual effect of viewing

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