Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-10-30
2007-10-30
Lewis, David L. (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S098000
Reexamination Certificate
active
10702077
ABSTRACT:
The subject invention discloses a scanning direction control circuit, which includes a bidirectional shift register in which shifting direction is switched in accordance with a switching signal L/R, which is step-upped by a level shifter when having lower amplitude than the driving voltage. The scanning direction control circuit includes a latch circuit between the level shifter and the bidirectional shift register, and a control circuit causes the latch circuit to carry out latching operation after shifting operation of flip-flops constituting the bidirectional shift register is completed in response to output signals of the flip-flops. The control circuit brings the level shifter into active state in a period before, at and after the latching timing, and brings the level shifter into inactive state in the remaining period. With this arrangement, the switching signal L/R can be supplied at a predetermined timing regardless of external input timing thereof, with low power consumption.
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Murakami et al., “Level Shifter Circuit and Display Device Provided Therewith”, U.S. Appl. No. 10/438,886, filed May 16, 2003, pp. 1-120, Figures 1-22, Official filing Receipt.
Gyouten Seijirou
Hayashi Shunsuke
Ina Keiichi
Matsuda Eiji
Murakami Yuhichiroh
Lewis David L.
Sharp Kabushiki Kaisha
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