G - Physics
09
G
G09G 3/18 (2006.01) G09G 3/36 (2006.01)
Patent
CA 2043175
A display system for displaying a visual image in response to a video signal comprising a liquid crystal display panel divided into a plurality of addressable, variable brightness sections, address means for generating a section address corresponding to a section in response to a timing signal, driver means for varying the brightness of the section in response to the brightness signal derived from the video signal, characterized in that the display system further comprises a memory for storing a predetermined correction signal corresponding to the section, and control means coupled to the driver means for varying the brightness signal to reduce brightness non-uniformities in the displayed image in response to the video signal and the correction signal in combination. The control means preferably includes a summing circuit for adding the correction signal to the video signal to produce a summed signal for determining the brightness signal. In another preferred embodiment the control means includes a voltage control circuit for varying the amplitude of the brightness signal in response to the correction signal.
Beeteson John S.
Pietrzak Christopher C.
International Business Machines Corporation
Saunders Raymond H.
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