Hologram color filter, liquid crystal display device using the same, and fabrication process of hologram color filter
First Claim
1. A hologram color filter, comprising:
- a hologram, wherein incident light is spectrally diffracted by said hologram into spectral components of different wavelength, wherein one of said spectral components is emitted to a desired position at a predetermined spatial period, and wherein said hologram has an efficiency of diffraction independent, or less dependent, on wavelength.
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Accused Products
Abstract
The present invention has for its object to spectrally diffract white light by a hologram for the illumination of a given position, thereby achieving some considerable improvement in the efficiency of utilization of backlight for liquid crystal display, etc., and makes use of a difference in the angle of diffraction of a hologram 5 depending on wavelength to diffract the wavelength components of the colors displayed into liquid crystal cells R, G and B of a liquid crystal display element 10 located at the back side of the hologram 5, thereby achieving some considerable improvement in the efficiency of utilization of backlight. As the hologram 5, an array form of converging unit holograms with the efficiency of diffraction independent, or less dependent, on wavelength, or other equivalent hologram arrangement may be used.
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Citations
65 Claims
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1. A hologram color filter, comprising:
a hologram, wherein incident light is spectrally diffracted by said hologram into spectral components of different wavelength, wherein one of said spectral components is emitted to a desired position at a predetermined spatial period, and wherein said hologram has an efficiency of diffraction independent, or less dependent, on wavelength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A liquid crystal display device, comprising:
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a hologram color filter, which is illuminated by backlight from behind to provide a color display, wherein said hologram filter comprises a hologram which has an efficiency of diffraction independent, or less dependent, on wavelength is located on a side of said liquid crystal display device onto which said backlight is incident and liquid crystal cells, wherein wavelength components of said backlight which are spectrally diffracted by said hologram are allowed to strike onto said liquid crystal cells for creating corresponding colors of said color display. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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63. A fabrication process of a hologram color filter comprising the steps of:
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disposing converging unit holograms in an array wherein said converging unit holograms have an efficiency of diffraction independent, or less dependent, on wavelength and spectrally diffract light incident thereon into spectral components of different wavelength in order to emit said spectral components to a desired position at a predetermined spatial period; producing a computer-generated hologram having properties of said converging unit holograms; bringing said computer-generated hologram in contact with a photosensitive material or superposing said computer-generated hologram and said photosensitive material together with a gap therebetween; and illuminating said computer-generated hologram with coherent light such that light diffracted by said computer-generated hologram and undiffracted light propagated rectilinearly through said computer-generated hologram interfere with each other in said photosensitive material for reproducing a copied hologram from said computer-generated hologram. - View Dependent Claims (64)
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65. A fabrication process of a hologram color filter comprising the steps of:
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disposing converging unit holograms in an array, wherein said converging unit holograms have an efficiency of diffraction independent, or less dependent, on wavelength and spectrally diffract light incident thereon into spectral components of different wavelength in order to emit said spectral components to a desired position at a predetermined spatial period; producing a relief computer-generated hologram having properties of said converging unit holograms; coating a photosetting resin on a relief surface of said relief computer-generated hologram; and irradiating said photosetting resin with light for copying said relief computer-generated hologram in the form of a relief hologram onto said photosensitive resin.
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Specification