Curved-surface pyramidal micro-lens array and rear projection screen with the lens array

Abstract

The invention relates to a rear projection optics screen and especially relates to a curved-surface pyramidal micro-lens array and a rear projection screen with the lens array used in a rear projection screen. The curved-surface pyramidal micro-lens array is an array structure formed by a plurality of curved-surface pyramidal micro-lens units. The each curved-surface pyramidal micro-lens unit possesses a bottom surface, a top surface and four side surfaces which connect the bottom surface and the top surface. The bottom surface of the curved-surface pyramidal micro-lens unit is a square, the top surface is a spherical surface and the side surfaces are cambered surface. The rear projection screen comprises: a Fresnel screen, the curved-surface pyramidal micro-lens array and a scattering layer with a fine hair surface. The bottom surfaces of the curved-surface pyramidal micro-lens units are connected with the Fresnel screen. The top surfaces are connected with the scattering layer with the fine hair surface. A black coating is coated between the adjacent curved-surface pyramidal micro-lens units. The array and the rear projection screen possess the following advantages: high transmittance, a high contrast ratio, high resolution, an anti-glare characteristic and a large angle of field of view.

Description

technical field [0001] The invention relates to a rear projection optical screen, in particular to a curved pyramid microlens array used in the rear projection screen and a rear projection screen with the lens array. Background technique [0002] Rear-projection optical screens are currently widely used in large conference rooms, command and control centers, training and education, video conferences, exhibition halls, exhibition halls, auditoriums, gymnasiums, concert halls, supermarkets, airports, stations, docks, cafeterias, window displays, etc. , and even various complex environments with strong ambient light, which puts forward higher requirements for optical screens. [0003] An optical screen refers to a projection screen that contains one or more optical lens systems, and a rear projection screen is usually composed of a Fresnel lens and a diffuse reflection screen. The light emitted by the optical machine becomes parallel light after passing through the Fresnel scr...

AI Technical Summary

Problems solved by technology

But since the part between the glass beads has a black coating 5, this will cause at least 21.5% loss of light energy, such as image 3 As shown, so the glass bead screen has certain defects in the utilization of light energy

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