Liquid crystal cells – elements and systems – Liquid crystal system – Projector including liquid crystal cell
Patent
1995-06-26
2000-07-11
Parker, Kenneth
Liquid crystal cells, elements and systems
Liquid crystal system
Projector including liquid crystal cell
349 61, 349 96, 349117, 359494, G02F 11335
Patent
active
060880678
ABSTRACT:
A liquid crystal display (LCD) projection system including a projection panel, a light source, and a reflector. The projection panel includes an LCD and a polarizer on one side of the LCD and a reflective polarizer on the other side. The reflective polarizer is a multilayer stack of pairs of adjacent material layers. Each of the layer pairs exhibits a refractive index difference between the adjacent layers in a first direction in the plane of the reflective polarizer and exhibits essentially no refractive index difference between adjacent layers in a second direction in the plane of the reflective polarizer and orthogonal to the first direction. A quarter-wave plate is secured to the reflective polarizer. Light rays from the light source either pass through the reflective polarizer, and on to the LCD, or are reflected back toward the light source, depending on their polarization. Light which is reflected by the reflective polarizer is reflected by the reflector back toward the LCD again. The use of the quarter-wave plate and the reflector help to recycle what would typically be regarded as wasted light, while at the same time reducing heat build-up within the LCD.
REFERENCES:
patent: Re34605 (1994-05-01), Schrenk et al.
patent: 1610423 (1926-12-01), Cawley
patent: 2492809 (1949-12-01), Marks
patent: 2887566 (1959-05-01), Marks
patent: 3124639 (1964-03-01), Kahn
patent: 3213753 (1965-10-01), Rogers
patent: 3528723 (1970-09-01), Rogers
patent: 3610729 (1971-10-01), Rogers
patent: 3647612 (1972-03-01), Schrenk et al.
patent: 3711176 (1973-01-01), Alfrey, Jr. et al.
patent: 3759647 (1973-09-01), Schrenk et al.
patent: 3773882 (1973-11-01), Schrenk
patent: 3801429 (1974-04-01), Schrenk et al.
patent: 3860036 (1975-01-01), Newman, Jr.
patent: 4025688 (1977-05-01), Nagy et al.
patent: 4094947 (1978-06-01), Alfrey, Jr. et al.
patent: 4268127 (1981-05-01), Oshima et al.
patent: 4310584 (1982-01-01), Cooper et al.
patent: 4315258 (1982-02-01), McKnight et al.
patent: 4427741 (1984-01-01), Aizawa et al.
patent: 4446305 (1984-05-01), Rogers et al.
patent: 4520189 (1985-05-01), Rogers et al.
patent: 4521588 (1985-06-01), Rogers et al.
patent: 4525413 (1985-06-01), Rogers et al.
patent: 4540623 (1985-09-01), Im et al.
patent: 4678285 (1987-07-01), Ohta et al.
patent: 4720426 (1988-01-01), Englert et al.
patent: 4756953 (1988-07-01), Utsumi
patent: 4772098 (1988-09-01), Ogawa
patent: 4796978 (1989-01-01), Tanaka et al.
patent: 4798448 (1989-01-01), van Raalte
patent: 4917465 (1990-04-01), Conner et al.
patent: 4937134 (1990-06-01), Schrenk et al.
patent: 4952925 (1990-08-01), Haastert
patent: 4989076 (1991-01-01), Owada et al.
patent: 5032021 (1991-07-01), Kanatani et al.
patent: 5042921 (1991-08-01), Sato et al.
patent: 5089318 (1992-02-01), Shetty et al.
patent: 5094788 (1992-03-01), Schrenk et al.
patent: 5094793 (1992-03-01), Schrenk et al.
patent: 5095210 (1992-03-01), Wheatley et al.
patent: 5103337 (1992-04-01), Schrenk et al.
patent: 5122905 (1992-06-01), Wheatley et al.
patent: 5122906 (1992-06-01), Wheatley
patent: 5124841 (1992-06-01), Oishi
patent: 5126880 (1992-06-01), Wheatley et al.
patent: 5149578 (1992-09-01), Wheatley et al.
patent: 5157526 (1992-10-01), Kondo et al.
patent: 5159478 (1992-10-01), Akiyama et al.
patent: 5170194 (1992-12-01), Kurematsu et al.
patent: 5188760 (1993-02-01), Hikmet et al.
patent: 5202074 (1993-04-01), Schrenk et al.
patent: 5211878 (1993-05-01), Reiffenrath et al.
patent: 5217794 (1993-06-01), Schrenk
patent: 5233465 (1993-08-01), Wheatley et al.
patent: 5234729 (1993-08-01), Wheatley et al.
patent: 5235443 (1993-08-01), Barnik et al.
patent: 5255029 (1993-10-01), Vogeley et al.
patent: 5260730 (1993-11-01), Williams et al.
patent: 5269995 (1993-12-01), Ramanathan et al.
patent: 5278694 (1994-01-01), Wheatley et al.
patent: 5282121 (1994-01-01), Bornhorst et al.
patent: 5294657 (1994-03-01), Melendy et al.
patent: 5316703 (1994-05-01), Schrenk
patent: 5319478 (1994-06-01), Fijnfschilling et al.
patent: 5325218 (1994-06-01), Willett et al.
patent: 5333072 (1994-07-01), Willett
patent: 5339198 (1994-08-01), Wheatly et al.
patent: 5359691 (1994-10-01), Tai et al.
patent: 5389324 (1995-02-01), Lewis et al.
patent: 5422786 (1995-06-01), Weber
patent: 5424119 (1995-06-01), Phillips et al.
patent: 5448404 (1995-09-01), Schrenk et al.
patent: 5451449 (1995-09-01), Shetty et al.
patent: 5486935 (1996-01-01), Kalmanash
patent: 5486949 (1996-01-01), Schrenk et al.
patent: 5540978 (1996-07-01), Schrenk
patent: 5552927 (1996-09-01), Wheatly et al.
patent: 5559634 (1996-09-01), Weber
patent: 5568316 (1996-10-01), Schrenk et al.
patent: 5612820 (1997-03-01), Schrenk et al.
patent: 5629055 (1997-05-01), Revol et al.
patent: 5686979 (1997-11-01), Weber et al.
patent: 5699188 (1997-12-01), Gilbert et al.
patent: 5721603 (1998-02-01), De Vaan et al.
patent: 5744534 (1998-04-01), Ishiharada et al.
patent: 5751388 (1998-05-01), Larson
patent: 5767935 (1998-06-01), Ueda et al.
patent: 5770306 (1998-06-01), Suzuki et al.
patent: 5783120 (1998-07-01), Ouderkirk et al.
patent: 5793456 (1998-08-01), Broer et al.
patent: 5808794 (1998-09-01), Weber et al.
patent: 5825542 (1998-10-01), Cobb, Jr. et al.
patent: 5825543 (1998-10-01), Ouderkirk et al.
"23:3: Retroreflecting Sheet Polarizer," M. F. Weber, SID 92 DIGEST, pp. 427-429.
"P-61: Retroreflecting Sheet Polarizer," M. F. Weber, SID 93 DIGEST, pp. 669-672.
Alfrey, T. et al., "Physical Optics of Iridescent Multilayered Plastic Films", Polymer Engineering and Science, vol. 9, No. 6, p. 400-4 (Nov. 1969).
Hodgkinson, I. et al., "Effective Principal Refractive Indices and Column Angles for Periodic Stacks of Thin Birefringent Films", J. Opt. Soc. Am. A, vol. 10, No.9, p. 2065-71 (1993).
Im, J. et al., "Coextruded Microlayer Film and Sheet", Journal of Plastic Film and Sheeting, vol. 4, p. 104-5 (Apr., 1988).
MacLeod, H.A., Thin Film Optical Filters, Adam Hilger Ltd.: London (1969).
Radford, J. et al., "Reflectivity of Iridescent Coextruded Multilayered Plastic Films", Polymer Engineering and Science, vol. 13, No. 3, p. 216-21 (May 1973).
Schrenk, W. et al., "Coextruded Iridescent Film", TAPPI Paper Synthetics Conference, Atlanta, Georgia, p. 141-5 (Sep. 27-29, 1976).
Schrenk et al., "Interfacial Flow Instability in Multilayer Coextrusion", Polymer Engineering and Science, vol. 18 (8), p. 620-3 (Jun. 1978).
Schrenk et al., "Coextruded Multilayer Polymer Films and Sheet", Polymer Blends, Ch. 15, vol. 2, 129, Academic Press, Inc., p. 129-65 (1978).
Schrenk, W. et al., "Coextruded Elastomeric Optical Interference Film", SPE Annual Technical Conference, Atlanta, GA, p. 1703-7 (1988).
Schrenk, W., "New Developments in Coextrusion", International Conference on Advances in Polymer Processing, New Orleans, LA, (Apr. 2-4, 1991).
Schrenk, W. et al., "Coextruded Infrared Reflecting Films", 7th Annual Meeting Polymer Processing Society, Hamilton, Ontario, Canada, p. 222-3 (Apr. 1991).
Wu et al., "High Transparent Sheet Polarizer Made with Birefringent Materials", Jpn. J. Appl. Phys.. vol. 34, Pt. 2, No. 8A, p. L997-99 (Aug. 1995).
Schrenk et al., Nanolayer polymeric optical films, Tappi Journal, pp. 169-174, Jun., 1992.
Jonza James M.
Ouderkirk Andrew J.
Weber Michael F.
Willett Stephen J.
3M Innovative Properties Company
Duong Tai V.
Miller William D.
Parker Kenneth
LandOfFree
Liquid crystal display projection system using multilayer optica does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid crystal display projection system using multilayer optica, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid crystal display projection system using multilayer optica will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-547176