Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1998-05-18
2000-08-15
Liang, Regina
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 94, G09G 336
Patent
active
061043656
ABSTRACT:
A ferroelectric liquid crystal display comprises an addressable matrix of pixels 7 and addressing circuitry comprising a data signal generator 14 for applying data signals to column electrode tracks 4.sub.1, 4.sub.2. . . . . 4.sub.n and a strobe signal generator 15 for applying strobe signals to row electrode tracks 5.sub.1, 5.sub.2. . . . . 5.sub.m in order to selectively switch the pixels 7. In order to provide a large number of well defined grey levels, the addressing circuitry includes spatial and/or temporal dither control circuits for addressing separately addressable subpixels of each pixel 7 with different combinations of spatial dither signals and/or for addressing at least part of each pixel with different combinations of temporal dither signals applied to separately addressable temporal bits corresponding to subframes of different periods to produce a plurality of different transmission levels. Furthermore at least a part of each pixel is switchable between different states by means of on and off switching signals, at least one bit of some of the pixels being switchable into intermediate states, including at least one error producing analogue state, by intermediate switching signals in order to produce intermediate overall transmission levels, and such switching being controlled so that periods in which at least part of the pixel is in an error producing analogue state alternate with periods in which the part is in a substantially error free state in order to limit the propagation of transmission errors.
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K.F. Reinhart et al.; Ferroelectrics, 1991, vol. 113, pp. 405-417; "Addressing of Ferroelectric Liquid Crystal Matrices and Electrooptical Charaterization".
P. Maltese; Mol. Cryst. Liq. Cryst., 1992, vol. 215, pp. 57-72; "Advances and Problems in the Development of Ferroelectric Liquid Crystal Displays".
W.J.A.M. Hartman; Ferroelectrics, 1991, vol. 122, pp. 1-26; "Ferroelectric Liquid Crystal Displays for Television Application".
IBM Technical Disclosure Bulletin; Feb. 1993, vol. 36, No. 2, pp. 425-426.
Bonnett Paul
Towler Michael John
Ulrich Diana Cynthia
Liang Regina
Sharp Kabushiki Kaisha
The Secretary of State for Defence in Her Britannic Majesty's Go
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