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Reflection type diffuse hologram, hologram for reflection hologram color filters, etc., and reflection type display device using such holograms
Reflection type diffuse hologram, hologram for reflection hologram color filters, etc., and reflection type display device using such holograms
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机译：反射型漫射全息图，用于反射全息图滤色器的全息图等，以及使用这种全息图的反射式显示装置
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摘要
The invention provides a diffusing plate with the angle of diffusion controllable within a desired range by use of a hologram, which is capable of presenting bright displays so that it is applicable to, for instance, a backlighting diffusing plate for liquid crystal display device. A diffusing plate 2 having an angle of diffusion θ is brought into close contact with a hologram photosensitive material 1. Then, parallel light 3 is obliquely at an angle of incidence α on the photosensitive material while parallel light 4 is vertically incident on the diffusing plate 2. Thereupon, parallel light 4 is converted into diffused light 5 having an angle of diffraction θ upon passing through the diffusing plate 2. Diffused light 5 interferes with obliquely incident parallel light 3 from the opposite direction in photosensitive material 1 to produce interference fringes, thereby forming a reflection type hologram. Upon parallel illumination light on the hologram at the same angle of incidence α at which parallel light 3 strikes for recording, diffused light having the same angle of diffraction θ as that of diffused light 5 used for recording is reflected, and diffracted from this reflection type hologram.
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