US5506701A
Expired / Lapsed
US
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Hologram color filter, liquid crystal display device using the same, and fabrication process of hologram color filter
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1994-01-28
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Granted: 1996-04-09
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Expires: 2014-01-28
Abstract
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.
Inventors
- 👤 Nobuhiko Ichikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:56
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B5/1876; G02B5/188; G02B5/1885; G02B5/20; G02B5/201; G02B5/203; G02B5/32; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133621; G02F1/133509; G02F1/133514; G03; G03H; G03H1/00; G03H1/04; G03H1/0402; G03H2001/0439; G03H1/0476; G03H2001/0478
Claims Analysis
Total Claims: 69
Claim 1
Independent Claim
54 words
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.
Claim 2
Dependent Claim
54 words
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.
Claim 3
Dependent Claim
38 words
A hologram color filter as claimed in claim 1, wherein said hologram is produced by disposing converging unit holograms in an array wherein said converging unit holograms have an efficiency of diffraction independent, or less dependent, on wavelength.
Claim 4
Dependent Claim
33 words
A hologram color filter as claimed in claim 2, wherein said hologram color filter is located on a light-incident side of an imaging device made up of a periodic arrangement of photodetection elements.
Claim 5
Dependent Claim
45 words
A hologram color filter as claimed in claim 2, wherein said hologram color filter is located on a side of a liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element comprises a periodic arrangement of liquid crystal cells.
Claim 6
Dependent Claim
49 words
A hologram color filter as claimed in claim 4, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element comprises means for projecting an image displayed by said liquid crystal display.
Claim 7
Dependent Claim
31 words
A hologram color filter as claimed in claim 4, wherein said liquid crystal display element comprises a light-blocking means at a position corresponding to a region between said liquid crystal cells.
Claim 8
Dependent Claim
49 words
A hologram color filter as claimed in claim 6, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element comprises means for projecting an image displayed by said liquid crystal display.
Claim 9
Dependent Claim
26 words
A hologram color filter as claimed in claim 6, wherein an additional color filter is disposed between said liquid crystal display element and said light-blocking means.
Claim 10
Dependent Claim
25 words
A hologram color filter as claimed in claim 4, wherein a light-diffusing means is located at any position on said light-emerging side of said hologram.
Claim 11
Dependent Claim
49 words
A hologram color filter as claimed in claim 9, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element comprises means for projecting an image displayed by said liquid crystal display.
Claim 12
Dependent Claim
31 words
A hologram color filter as claimed in claim 9, wherein said liquid crystal display element comprises a light-blocking means at a position corresponding to a region between said liquid crystal cells.
Claim 13
Dependent Claim
49 words
A hologram color filter as claimed in claim 11, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element comprises means for projecting an image displayed by said liquid crystal display.
Claim 14
Dependent Claim
26 words
A hologram color filter as claimed in claim 11, wherein an additional color filter is disposed between said liquid crystal display element and said light-blocking means.
Claim 15
Dependent Claim
45 words
A hologram color filter as claimed in claim 1, wherein said hologram comprises uniform interference fringes with an efficiency of diffraction independent, or less dependent, on wavelength and wherein an array of converging elements is arranged on a light-striking or emerging side of said hologram.
Claim 16
Dependent Claim
33 words
A hologram color filter as claimed in claim 14, wherein said hologram color filter is located on a light-incident side of an imaging device made up of a periodic arrangement of photodetection elements.
Claim 17
Dependent Claim
45 words
A hologram color filter as claimed in claim 14, wherein said hologram color filter is located on a side of a liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element comprises a periodic arrangement of liquid crystal cells.
Claim 18
Dependent Claim
49 words
A hologram color filter as claimed in claim 16, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element is used for projecting an image displayed by said liquid crystal display.
Claim 19
Dependent Claim
31 words
A hologram color filter as claimed in claim 16, wherein said liquid crystal display element comprises a light-blocking means at a position corresponding to a region between said liquid crystal cells.
Claim 20
Dependent Claim
49 words
A hologram color filter as claimed in claim 18, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element is used for projecting an image displayed by said liquid crystal display.
Claim 21
Dependent Claim
26 words
A hologram color filter as claimed in claim 18, wherein an additional color filter is disposed between said liquid crystal display element and said light-blocking means.
Claim 22
Dependent Claim
25 words
A hologram color filter as claimed in claim 16, wherein a light-diffusing means is located at any position on said light-emerging side of said hologram.
Claim 23
Dependent Claim
49 words
A hologram color filter as claimed in claim 21, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element is used for projecting an image displayed by said liquid crystal display.
Claim 24
Dependent Claim
31 words
A hologram color filter as claimed in claim 21, wherein said liquid crystal display element comprises a light-blocking means at a position corresponding to a region between said liquid crystal cells.
Claim 25
Dependent Claim
49 words
A hologram color filter as claimed in claim 23, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element comprises means for projecting an image displayed by said liquid crystal display.
Claim 26
Dependent Claim
26 words
A hologram color filter as claimed in claim 23, wherein an additional color filter is disposed between said liquid crystal display element and said light-blocking means.
Claim 27
Dependent Claim
45 words
A hologram color filter as claimed in claim 1, wherein said hologram color filter is located on a side of a liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element comprises a periodic arrangement of liquid crystal cells.
Claim 28
Dependent Claim
25 words
A hologram color filter as claimed in claim 26, wherein a light-diffusing means is located at any position on a light-emerging side of said hologram.
Claim 29
Dependent Claim
49 words
A hologram color filter as claimed in claim 27, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element is used for projecting an image displayed by said liquid crystal display.
Claim 30
Dependent Claim
31 words
A hologram color filter as claimed in claim 27, wherein said liquid crystal display element comprises a light-blocking means at a position corresponding to a region between said liquid crystal cells.
Claim 31
Dependent Claim
49 words
A hologram color filter as claimed in claim 29, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element is used for projecting an image displayed by said liquid crystal display.
Claim 32
Dependent Claim
26 words
A hologram color filter as claimed in claim 29, wherein an additional color filter is disposed between said liquid crystal display element and said light-blocking means.
Claim 33
Dependent Claim
31 words
A hologram color filter as claimed in claim 26, wherein said liquid crystal display element comprises a light-blocking means at a position corresponding to a region between said liquid crystal cells.
Claim 34
Dependent Claim
49 words
A hologram color filter as claimed in claim 32, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element is used for projecting an image displayed by said liquid crystal display.
Claim 35
Dependent Claim
26 words
A hologram color filter as claimed in claim 32, wherein an additional color filter is disposed between said liquid crystal display element and said light-blocking means.
Claim 36
Dependent Claim
49 words
A hologram color filter as claimed in claim 26, wherein said hologram color filter is located on said side of said liquid crystal display element onto which backlight is incident and wherein said liquid crystal display element is used for projecting an image displayed by said liquid crystal display.
Claim 37
Dependent Claim
33 words
A hologram color filter as claimed in claim 1, wherein said hologram color filter is located on a light-incident side of an imaging device made up of a periodic arrangement of photodetection elements.
Claim 38
Dependent Claim
92 words
A liquid crystal display device, comprising: 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.
Claim 39
Dependent Claim
92 words
A liquid crystal display device, comprising: 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.
Claim 40
Dependent Claim
28 words
A liquid crystal display device as claimed in claim 37, wherein a light-blocking means is located at a position corresponding to a region between said liquid crystal cells.
Claim 41
Dependent Claim
22 words
A liquid crystal display device as claimed in claim 38, wherein a photopolymer is used as a material for recording said hologram.
Claim 42
Dependent Claim
34 words
A liquid crystal display device as claimed in claim 38, wherein a converging element corresponding to each of said liquid crystal cells is located between said hologram and each of said liquid crystal cells.
Claim 43
Dependent Claim
71 words
A liquid crystal display device as claimed in claim 38, wherein said hologram comprises uniform interference fringes with said efficiency of diffraction independent, or less dependent, on wavelength, and wherein converging elements are arranged on a side of said hologram on which said backlight strikes or from which said backlight is emitted, and wherein each of said converging elements corresponds to three liquid crystal cells which are adjacent to each other.
Claim 44
Dependent Claim
66 words
A liquid crystal display device as claimed in claim 38, wherein said hologram comprises an array of converging unit holograms, wherein each of said converging unit holograms corresponds to three liquid crystal cells which are adjacent to each other, and wherein each converging unit hologram spectrally diffracts said backlight, which substantially obliquely strikes a hologram plane, onto a set of liquid crystal cells in in-line configuration.
Claim 45
Dependent Claim
69 words
A liquid crystal display device as claimed in claim 38, wherein said hologram comprises an array of converging unit holograms, wherein each of said converging unit holograms corresponds to three liquid crystal cells which are adjacent to each other, and wherein each converging unit hologram spectrally diffracts said backlight, which substantially vertically strikes a hologram plane of said hologram, onto a set of liquid crystal cells in offset configuration.
Claim 46
Dependent Claim
29 words
A liquid crystal display device as claimed in claim 38, wherein another color filter of a different color is periodically located with respect to an adjacent liquid crystal cell.
Claim 47
Dependent Claim
22 words
A liquid crystal display device as claimed in claim 44, wherein a photopolymer is used as a material for recording said hologram.
Claim 48
Dependent Claim
34 words
A liquid crystal display device as claimed in claim 44, wherein a converging element corresponding to each of said liquid crystal cells is located between said hologram and each of said liquid crystal cells.
Claim 49
Dependent Claim
71 words
A liquid crystal display device as claimed in claim 44, wherein said hologram comprises uniform interference fringes with said efficiency of diffraction independent, or less dependent, on wavelength, and wherein converging elements are arranged on a side of said hologram on which said backlight strikes or from which said backlight is emitted, and wherein each of said converging elements corresponds to three liquid crystal cells which are adjacent to each other.
Claim 50
Dependent Claim
66 words
A liquid crystal display device as claimed in claim 44, wherein said hologram comprises an array of converging unit holograms, wherein each of said converging unit holograms corresponds to three liquid crystal cells which are adjacent to each other, and wherein each converging unit hologram spectrally diffracts said backlight, which substantially obliquely strikes a hologram plane, onto a set of liquid crystal cells in in-line configuration.
Claim 51
Dependent Claim
69 words
A liquid crystal display device as claimed in claim 44, wherein said hologram comprises an array of converging unit holograms, wherein each of said converging unit holograms corresponds to three liquid crystal cells which are adjacent to each other, and wherein each converging unit hologram spectrally diffracts said backlight, which substantially vertically strikes a hologram plane of said hologram, onto a set of liquid crystal cells in offset configuration.
Claim 52
Dependent Claim
29 words
A liquid crystal display device as claimed in claim 37, wherein another color filter of a different color is periodically located with respect to an adjacent liquid crystal cell.
Claim 53
Dependent Claim
22 words
A liquid crystal display device as claimed in claim 50, wherein a photopolymer is used as a material for recording said hologram.
Claim 54
Dependent Claim
34 words
A liquid crystal display device as claimed in claim 50, wherein a converging element corresponding to each of said liquid crystal cells is located between said hologram and each of said liquid crystal cells.
Claim 55
Dependent Claim
71 words
A liquid crystal display device as claimed in claim 50, wherein said hologram comprises uniform interference fringes with said efficiency of diffraction independent, or less dependent, on wavelength, and wherein converging elements are arranged on a side of said hologram on which said backlight strikes or from which said backlight is emitted, and wherein each of said converging elements corresponds to three liquid crystal cells which are adjacent to each other.
Claim 56
Dependent Claim
66 words
A liquid crystal display device as claimed in claim 50, wherein said hologram comprises an array of converging unit holograms, wherein each of said converging unit holograms corresponds to three liquid crystal cells which are adjacent to each other, and wherein each converging unit hologram spectrally diffracts said backlight, which substantially obliquely strikes a hologram plane, onto a set of liquid crystal cells in in-line configuration.
Claim 57
Dependent Claim
69 words
A liquid crystal display device as claimed in claim 50, wherein said hologram comprises an array of converging unit holograms, wherein each of said converging unit holograms corresponds to three liquid crystal cells which are adjacent to each other, and wherein each converging unit hologram spectrally diffracts said backlight, which substantially vertically strikes a hologram plane of said hologram, onto a set of liquid crystal cells in offset configuration.
Claim 58
Dependent Claim
69 words
A liquid crystal display device as claimed in claim 37, wherein said hologram comprises an array of converging unit holograms, wherein each of said converging unit holograms corresponds to three liquid crystal cells which are adjacent to each other, and wherein each converging unit hologram spectrally diffracts said backlight, which substantially vertically strikes a hologram plane of said hologram, onto a set of liquid crystal cells in offset configuration.
Claim 59
Dependent Claim
66 words
A liquid crystal display device as claimed in claim 37, wherein said hologram comprises an array of converging unit holograms, wherein each of said converging unit holograms corresponds to three liquid crystal cells which are adjacent to each other, and wherein each converging unit hologram spectrally diffracts said backlight, which substantially obliquely strikes a hologram plane, onto a set of liquid crystal cells in in-line configuration.
Claim 60
Dependent Claim
70 words
A liquid crystal display device as claimed in claim 37, wherein said hologram comprises uniform interference fringes with said efficiency of diffraction independent, or less dependent, on wavelength, wherein converging elements are arranged on a side of said hologram on which said backlight strikes or from which said backlight is emitted, and wherein each of said converging elements corresponds to three liquid crystal cells which are adjacent to each other.
Claim 61
Dependent Claim
34 words
A liquid crystal display device as claimed in claim 37, wherein a converging element corresponding to each of said liquid crystal cells is located between said hologram and each of said liquid crystal cells.
Claim 62
Dependent Claim
22 words
A liquid crystal display device as claimed in claim 37, wherein a photopolymer is used as a material for recording said hologram.
Claim 63
Dependent Claim
17 words
A liquid crystal display device as claimed in claim 37, wherein said hologram comprises a relief hologram.
Claim 64
Dependent Claim
17 words
A liquid crystal display device as claimed in claim 37, wherein said hologram comprises a computer-generated hologram.
Claim 65
Dependent Claim
140 words
A fabrication process of a hologram color filter comprising the steps of: 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.
Claim 66
Dependent Claim
140 words
A fabrication process of a hologram color filter comprising the steps of: 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.
Claim 67
Dependent Claim
25 words
A fabrication process of a hologram color filter as claimed in claim 63, wherein said copied hologram is used as an original for further copying.
Claim 68
Dependent Claim
112 words
A fabrication process of a hologram color filter comprising the steps of: 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.
Claim 69
Dependent Claim
112 words
A fabrication process of a hologram color filter comprising the steps of: 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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-09 | 1999-10-09 | 2000-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-09 | 2003-10-09 | 2004-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-09 | 2007-10-09 | 2008-04-09 | $7700.00 | Window Closed / Lapsed |