Sharp Kabushiki Kaisha Corporation

Mamoru Onda

Hajime Washio

Shunsuke Hayashi

Kazuhiro Maeda

Yuhichiroh Murakami

Seijirou Gyouten

Sachio Tsujino

Keiichi Ina

Eiji Matsuda

Nobuhiko Suzuki

Hiroshi Murofushi

In a structure in which a plurality of signals related to each other are supplied to a driving circuit in such a manner that at least one of the signals is supplied also to the other circuit, the present invention prevents change of phase relation between the plural signals due to difference in wiring load, without directly processing the signals with higher power consumption. The first and second clock signals SCKand SCKare supplied to the first data signal line driving circuit SD, while the first clock signal SCKis also supplied to the second data signal line driving circuit SDin parallel. The wiringsandfor the respective signals are adjusted to have equal wiring load with a dummy wiringprovided in the wiring, for solving uneven wiring load caused by difference of leading manner, the dummy wiringconstituting an additional capacitor section, together with a liquid crystal layer and a counter electrode.

Display device

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.

Scanning direction control circuit and display device

The present invention includes: a shift register section, including multiple-stage flip-flops operating in synchronism with a clock signal, for switching a shift direction in accordance with an externally supplied direction instruct signal; a waveform change section for changing in waveform a signal output of one of the flip-flops which is in a first predetermined stage; and an inspection signal switching section for switching, in accordance with the direction instruct signal, an output between the signal output which has been changed in waveform in the waveform change section and a signal output of one of the flip-flops which is in a second predetermined stage.

Bidirectional shift register and display device incorporating same

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Tenri, Japan

Mamoru Onda