Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1993-06-14
1997-01-28
Hjerpe, Richard
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 94, 345 99, 345208, G09G 336
Patent
active
055981798
ABSTRACT:
A processing system (500) addresses an electronic display (100) comprising picture elements (pixels) (108) controlled by a plurality of first and second electrodes (106, 104). The plurality of first electrodes (106) are controlled by a plurality of periodic first drive signals (400) having a predetermined number of time slots independent of data being displayed. The plurality of second electrodes (104) are controlled by a plurality of second drive signals responsive of the data being displayed. The processing system (500) comprises calculating engine (610, 612) calculating from data being received the plurality of second drive signals for one of the plurality of second electrodes (104) for a time slot of the predetermined number of time slots. The calculating engine (610, 612) calculates one of the plurality of drive signals for the one of the plurality of second electrodes (104) as a function of the plurality of periodic first drive signals (400) for the time slot and a selected plurality of pixel values for pixels collectively controlled by the one of the plurality of second electrodes. The calculating engine (610, 612) represents the plurality of periodic first drive signals as a sequency-ordered Walsh-Hadamard transform (WHT) matrix (300) having a number of rows corresponding to the plurality of first electrodes (106) and a number of columns corresponding to the predetermined number of time slots (410-412). An identifier (510) identifies a plurality of hierarchical tree structures (Rows 1-8) corresponding to the WHT matrix (300) representation of the plurality of periodic first drive signals (400). An encoder (1504) encodes the data. A processor processes (510) the encoded data and the hierarchical tree structures (Rows 1-8) identified in the WHT matrix (300) for addressing of the pixels (108) of the electronic display (100).
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Terry Scheffer and Jurgen Nehring, "Supertwisted Nematic (STN) LCDs," May 17, 1992, paper submitted to 1992 SID International Symposium, Boston, Massachusetts.
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Orlen Noah
Saidi Ali
Chanroo Keith A.
Hjerpe Richard
Motorola Inc.
Wu Xiao M.
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