Method and apparatus for driving passive matrix liquid crystal

Details Method and apparatus for driving passive matrix liquid crystal Method and apparatus for driving passive matrix liquid crystal

2008-07-22

2008-07-22

Shalwala, Bipin (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

C345S087000, C345S095000, C345S098000, C345S100000, C345S210000, C345S212000

Reexamination Certificate

active

07403195

ABSTRACT:
A method and an apparatus for driving passive matrix liquid crystal, comprising the steps of: simultaneously selecting Y row electrodes, where Y is an odd number of 7 and above; calculating an exclusive OR between a Y-bit row selection vector representing a selection pattern of the Y row electrodes and Y-bit ON/OFF display data representing a display pattern of column electrodes, for each corresponding bit; adding the exclusive ORs for each bit; when X=(Y+1)/2, and a 1/(X−1) voltage of the maximum voltage of the column electrodes is Vc, selecting a voltage level of the column electrodes from X voltage levels satisfying: [2×i−(X−1)]×Vc (i=an integer of 0 to (X−1)) in accordance with the result of the addition for driving. These method and apparatus prevent the frame response phenomenon of high-speed liquid crystal while realizing high-contrast display, low-voltage driving, low power consumption, and reduction in chip size.

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