Positive projection optical screen projection system short in projection distance

Abstract

The invention relates to a positive projection optical screen projection system short in projection distance, which comprises a positive projection screen (1) and a projector (2), wherein the projector (2) is arranged on one side of the positive projection screen (1); the positive projection screen (1) comprises an optical filtering layer (3), a diffusion layer (4), a micro prism array structure (10) and a substrate layer (5); the diffusion layer (4) is arranged on one face, deviating from the projector (2), of the optical filtering layer (3); the micro prism array structure (10) is arranged on one side, deviating from the projector (2), of the diffusion layer (4); a zonal micro prism array light reflection surface layer (6) and a zonal micro prism array light absorption surface layer (7) are respectively arranged on the two sides of the micro prism array structure (10); the zonal micro prism array light reflection surface layer (6) faces one side of the projector (2). The system has the advantage that under a bright environment, the positive projection optical screen projection system short in the projection distance has high gain, high contrast and high color revivification.

Description

technical field [0001] The invention relates to a forward projection optical screen, in particular to a projection system for a short projection distance forward projection optical screen. Background technique [0002] In recent years, with the improvement of the brightness of the projector itself, most projection screens need to be used in natural light or very bright environments. Due to the problem of technical principles, when using ordinary glass bead screens, white plastic screens, gray screens, etc. to project images, the stronger the ambient light is, the brighter the black pattern on the projected image will be, and the contrast of the projected image will drop seriously. The ambient light is superimposed and faded, resulting in unsatisfactory color reproduction. [0003] Therefore, when using a projection screen in a bright environment, especially a front projection screen, it is particularly important to solve the color reproduction performance of the projected i...

AI Technical Summary

Problems solved by technology

[0005] However, the approximately horizontal ambient light R1 that hits the upper area of ​​the screen and the light R2 that comes from the upper side of the screen with a larger incident angle are reflected by the screen and then exit, and finally enter the eyes of the observer 30, resulting in projection The image contrast is reduced, so a higher display contrast cannot be achieved

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