Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1992-05-04
1993-11-30
Weldon, Ulysses
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 89, G09G 336
Patent
active
052669360
ABSTRACT:
A driving circuit for a liquid crystal display comprises: a selector driving circuit having a plurality of shift registers and latch circuits for outputting hold signals latched in the latch circuits; a plurality of selector circuits each for selecting one reference coltage corresponding to the hold signal; a plurality of hold capacitors each being charged by the selected reference voltage; and a plurality of source follower circuits each receiving the hold voltage from the hold capacitor and outputting a driving voltage for the liquid crystal display. The driving circuit further comprise a plurality of comparator circuits each receiving the output driving voltage and the reference voltage selected and switching the connection of a ramp voltage to the hold capacitor. Each source follower circuit provided for each stage requires a constant current source and only one output driver transistor instead of as many transistors as the number of gradations, which transistor commonly operates over all the gradations. The driving circuit may comprise a plurality of level shifting or biasing circuits supplying to the respective selector circuits level-shifted reference voltages whose potentials are higher than the normal reference voltages by the amount of a biasing voltage applied to the constant current sources of the source follower circuits.
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Liang Regina
NEC Corporation
Weldon Ulysses
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