Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1996-12-20
1999-11-02
Wu, Xiao
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345102, 345 88, G09G 336
Patent
active
059779420
ABSTRACT:
In a color sequential system using LCDs, the LCD must operate faster than the frame rate because red, green, and blue are done sequentially. Ferroelectric LCDs can do this, but they are not analog devices and so cannot provide analog display levels. Instead, a pulse width modulation (PWM) technique is used. In the system of the present invention, each pixel has three storage devices to hold RGB analog levels. A latch is used to load these values in parallel. Then an analog 3:1 multiplexer is used to select the proper storage device for the current sequential color. The multiplexer output goes to a comparator, which has a sawtooth waveform input at much faster than the frame rate. The comparator output changes with the sawtooth level, so that PWM control is provided for each pixel. As an alternative, standard analog LCD pixels can be sequentially switched between three color input storage devices.
REFERENCES:
patent: 4799137 (1989-01-01), Aho
patent: 4874228 (1989-10-01), Aho et al.
patent: 5054885 (1991-10-01), Melby
patent: 5083857 (1992-01-01), Hornbeck
patent: 5122905 (1992-06-01), Wheatley et al.
patent: 5122906 (1992-06-01), Wheatley
patent: 5148157 (1992-09-01), Florence
patent: 5190370 (1993-03-01), Miller et al.
patent: 5225823 (1993-07-01), Kanaly
patent: 5233385 (1993-08-01), Sampsell
patent: 5313479 (1994-05-01), Florence
patent: 5381309 (1995-01-01), Borchardt
patent: 5404076 (1995-04-01), Dolan
patent: 5404171 (1995-04-01), Golstein et al.
patent: 5416618 (1995-05-01), Juday
patent: 5453859 (1995-09-01), Sannohe et al.
patent: 5467146 (1995-11-01), Huang et al.
patent: 5467154 (1995-11-01), Gale et al.
patent: 5471584 (1995-11-01), Blaxtan et al.
patent: 5486949 (1996-01-01), Schrenk et al.
patent: 5504391 (1996-04-01), Turner et al.
patent: 5508841 (1996-04-01), Lin et al.
patent: 5523881 (1996-06-01), Florence et al.
patent: 5555324 (1996-09-01), Waxman et al.
patent: 5573324 (1996-11-01), De Vaan
patent: 5606220 (1997-02-01), Dolan et al.
patent: 5612820 (1997-03-01), Schrenk et al.
patent: 5626800 (1997-05-01), Williams et al.
patent: 5642129 (1997-06-01), Zavracky et al.
patent: 5670842 (1997-09-01), Dolan et al.
patent: 5682080 (1997-10-01), Dolan et al.
patent: 5686793 (1997-11-01), Turner et al.
patent: 5692820 (1997-12-01), Gale et al.
Gambogi, W.J. et al., "Advances and Applications of DuPont Holographic Photopolymers," Optics Quebec '93, Conf. 2043, "Holographic Imaging and Materials" (Aug. 1993).
Gambogi, W.J. et al., "Color Holography Using DuPont Holographic Recording Films," Proc. SPIE, "Holographic Materials," vol. 2405 (Feb. 1995).
Gambogi, W.J. et al., "Holographic Transmission Elements Using Improved Photopolymer Films," SPIE vol. 1555 Computer and Optically Generated Holographic Optics (Fourth in a Series), pp. 256-266 (1991).
Gambogi, W.J. et al., "Diffractive Printing Methods Using Volume Holograms," IS&T/SPIE 1993 Int'l Conf. on Electronic Imaging, conf. 1914 (1993).
Handbook of Optics, vol. II, Devices, Measurements, and Properties, "Chapter 3--Polarizers".
Jack M. Younse, "Projection Display Systems Based on the Digital Micromirror Device (DMD)," SPIE Proceedings Reprint, vol. 2641, pp. 64-75 (Jul. 1995).
Joubert, C. et al., "Dispersive Holographic Microlens Matrix for Single LCD Projection."
Larry J. Hornbeck, "Digital Light Processing and MEMS: Timely Convergence for a Bright Future," presented at Micromachining and Microfabrication '95 (Oct. 23-24, 1995).
Parfenov, A.V. and Putilin, A.N., "Advanced Optical Schemes with Liquid Crystal Image Converters for Display Applications," SPIE vol. 2650, pp. 173-179 (Jul. 1996).
Tipton, D. et al., "Improved Process of Reflection Holography Replication and Heat Processing," Proc. SPIE, "Practical Holography VIII, Materials and Processing," vol. 2176 (Feb. 1994).
Weber, A.M. et al., "Hologram Recording in DuPont's New Photopolymer Materials," Practical Holography IV, SPIE OE/Lase Conference Proceedings, 1212-04 (Jan. 1990).
"Chapter 8--Liquid Crystal Displays," pp. 181-251.
"Optics for Image Disposition Systems".
Baur, T. et al., "High Performance Liquid Crystal Device Suitable for Projection Display," SPIE vol. 2650, pp. 226-228 (Jul. 1996).
Displaytech, Inc., "FLC/VLSI Display Technoloy" (Dec. 1, 1995).
Gambogi, W., et al., "HOE Imaging in DuPont Holographic Photopolymers," Proc. SPIE, "Diffractive and Holographic Optics Technology," vol. 2152 (1994).
Knox Richard M.
Walker Dale S.
Compaq Computer Corporation
Wu Xiao
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