Rear projection type screen

Abstract

In a screen using a microlens array, it is an object of the present invention to provide a low cost rear projection type screen with favorable contrast achieved by improving effect of blocking external light without reducing the luminance and the view angle characteristics and also to provide a rear projection type screen free from image quality degradation over a prolonged period due to its resistance to dust adhesion. The rear projection type screen has at least a transparent microlens array sheet 1 having a transparent microlens 3 which are arrayed on one surface thereof and which condenses parallel incident light on a focus, and a directional light absorbing sheet 2 having an aperture which transmits light from a specific direction and absorbs other light. The aperture is a pinhole array having an apertured pinhole 5 arrayed near the focus of the microlens 3. The aperture part of the pinhole is shaped into a truncated cone.

Description

technical field [0001] The invention relates to a rear projection screen used in image display devices such as rear projection projection televisions. Background technique [0002] In recent years, the market for rear-projection projection televisions has been expanding as an image display device capable of obtaining a large-screen image at a low price. [0003] The characteristics of the rear projection screen used therein greatly contribute to the brightness, contrast, and viewing angle characteristics of an image projected by a rear projection projection television. Therefore, in order to improve the characteristics of the screen, such as Figure 18 As shown, there is known a lenticular lens type screen, which uses a Fresnel lens sheet 103 to convert the divergent light 105 from the projector into a parallel light 106, and then uses a lenticular lens sheet 102 as a microcylindrical lens array to make the conversion into parallel light The light is concentrated on the gap...

AI Technical Summary

Problems solved by technology

[0004] The lenticular lens-type back-transparent screen has the following problems: because the lenticular lens sheet can only condense light in one-dimensional direction, in order to control the light emission angles in the up, down and left and right directions of the screen, it is necessary to use a combination of ridges and lines. Orthogonal two lenticular lens sheets, so the efficiency of light utilization is reduced, and the number of parts increases, which increases the cost

[0006] However, the existing rear-projection screens using microlens arrays use printing, photocopying or self-trimming methods to make the light-shielding layer, that is, the pinhole array, so it is difficult to make the light-shielding layer thick. The problem of shading effect of external light

[0007] On the other hand, when the louver-shaped light-absorbing wall array is not used at the same time as the black stripes, the opening in the light passing direction becomes too large, and the louver-shaped light-absorbing wall array cannot fully shield the external light, so the number of parts increases and the cost is high. high price problem

[0008] In addition, the existing screen is easy to charge, so if it is used for a long time, there is a problem that dust will be attracted by static electricity and the image quality will deteriorate.

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