Projection screen and its processing method

Abstract

The invention provides a projection screen and a processing method thereof, wherein the projection screen sequentially includes a diffusion layer, a microlens array and a base material from the projection light incident side, the inside of the base material is provided with a Fresnel microstructure, and the Fresnel A reflective layer is arranged on the surface of the microstructure, and the rest of the surface is a light-absorbing layer; the microlens array is used to focus the projected light on the reflective layer, and the reflective layer is used to reflect the projected light back to the viewer's field of view. Most of the light is absorbed by the light-absorbing layer. In the present invention, by setting the structure and size of the microlens array, the projection light is only incident on the reflective layer of the microstructure, and most of the ambient light is absorbed by the light-absorbing layer, thereby improving the light utilization rate of the screen and the ability to resist ambient light; The reflectivity of the screen does not reduce the reflectivity of the projector, so that the reflective screen has high gain and high contrast; it is suitable for ultra-short-throw projectors and ensures that the screen has better visual effects.

Description

technical field [0001] The invention relates to a projection screen and a processing method thereof. Background technique [0002] The screen is an important factor affecting the projection display system, which has a great influence on the image quality of the projection display, and the contrast of the screen is a parameter to evaluate the quality of a screen. The contrast of the picture reflected by the screen is affected by the ambient light and is much lower than the contrast of the projector itself. Because the general projector screen can reflect both the light of the projector and the light of the ambient light. [0003] In order to improve the screen contrast in the case of ambient light, the current anti-environmental light projection screen is a wire grid screen disclosed in the document CN1670618A, its structure is shown in Figure 2 (a), the microstructure The unit is composed of upper and lower slopes. The surface of the upper slope is coated with a layer of b...

AI Technical Summary

Problems solved by technology

[0005] The document with the publication number CN105408777A discloses a circular symmetrical Fresnel structure as shown in Figure 2(c). This invention utilizes the different incident angles of projected light and ambient light to improve contrast. The ambient light G2 passes through the reflective layer The upper reflective surface of the reflective layer is reflected to the ground direction, which does not affect the viewing contrast, but there is still a part of the ambient light G1 as shown in the figure, which will be reflected back into the viewing field through the lower reflective surface of the reflective layer

Therefore, the structure in this invention has limited effect on improving contrast

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