Light modulating devices having grey scale levels using multiple

Details Light modulating devices having grey scale levels using multiple Light modulating devices having grey scale levels using multiple

1997-12-15

2000-07-25

Powell, Mark R.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

G09G 510

Patent

active

060941871

ABSTRACT:
A ferroelectric liquid crystal display comprises an addressable matrix of pixels, and addressing circuitry for selectively addressing each pixel in order to vary the transmission level of the pixel relative to the transmission levels of the other pixels. The addressing circuitry includes spatial and/or temporal dither circuits for addressing separately addressable subpixels with different spatial dither signals and/or for addressing each pixel or subpixel with different temporal dither signals in separate subframes. In addition to such spatial and/or temporal dither, the addressing circuitry switches each pixel or subpixel between different grey states corresponding to different transmission levels, with at least two of the bits of spatial or temporal dither being switchable between more than two different grey states and at least one bit being switchable between a lesser number of different grey states than the or each other bit, so that a plurality of different overall transmission levels are achievable by different combinations of spatial and/or temporal dither and such grey states. This allows a larger number of substantially linearly spaced or suitably weighted grey levels to be produced than has previously been possible without giving rise to unacceptable complications.

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P. Maltese, Mol. Cryst. Liq. Cryst. 1992, vol. 215, pp. 57-72, "Advances and Problems in the Development of Ferroelectric Liquid Crystal Display".
K-F. Reinhart, et al., Ferroelectrics, 1991, vol. 113, pp. 405-417, "Addressing of Ferroelectric Liquid Crystal Matrices and Electrooptical Characterization".
W.J.A.M. Hartman, Ferroelectrics, 1991, vol. 122, pp. 1-26, "Ferroelectric Liquid Crystal Displays for Television Application".

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