optical projection screen

Abstract

An optical projection screen comprises a basal film, a lens layer, a reflecting layer, a surface film and a diffusion layer; wherein the lens layer is formed on the basal film and provided with a plurality of micro lens structures; the reflecting layer is formed on the lens layer; the surface film is arranged on the reflecting layer; and the diffusion layer is formed on the surface film and provided with a plurality of nano-scale black particles, a surface of the diffusion layer is in an uneven shape, thus the diffusion layer has a glare-resistant function and a scratch-resistant function. The reflecting layer reflects an incident light coming from a projector into an emergent light, a gain value of the emergent light can be raised and a reflection angle of the emergent light can be increased via the reflecting layer, then the uneven surface of the diffusion layer is utilized to diffuse the emergent light and avoid interferences of external lights, thus the optical projection screen may have a good light resistance and a high gain, and a half gain visual angle of the optical projection screen can reach more than 175 degrees.

Description

technical field [0001] The invention relates to a screen, in particular to an optical projection screen with good light resistance, high black-and-white contrast, high gain, and a half-gain viewing angle of more than 175 degrees. Background technique [0002] refer to figure 1 The projection screen 1 is generally used in movie theaters, meeting rooms, and home theaters, and the projection light 12 from a projector 11 is presented on the projection screen 1 in a diffuse or reflective manner. When the direction of the projection light 12 is fixed and the luminous flux is constant, the ratio of the brightness of the diffused and reflected beams of the projection screen 1 to the projection light 12 is called the gain of the projection screen 1 (Gain). In the horizontal direction, the gain value of the projection screen 1 gradually decreases from the center to the outside, and an angle at which the half gain value (Half Gain) can be viewed is defined as the half gain viewing ang...

AI Technical Summary

Problems solved by technology

[0006] 1. Poor light resistance

[0007] The traditional projection screen 1 is easy to diffuse or reflect other light sources around, so when projecting, it needs to be in a relatively dark environment to get a better visual effect, so the light resistance is poor

[0008] 2. High gain but narrow viewing angle

[0009] Although the U.S. Patent No. 6,747,796 can increase the gain value of the traditional projection screen 1 and improve its light resistance, it is also easy to refract other external light because of its circular surface structure, so that the viewing angle is between 40 and 70 degrees. Only the gain value can be significantly increased, so the viewing angle becomes quite narrow

[0010] 3. The use environment is limited

[0013] Due to the reflection and refraction of external light, and there is no function to improve color saturation and black-and-white contrast, the image presented is low color saturation and low black-and-white contrast

Images