Scan-driving circuit and a display device
AssigneeWuhan China Star Optoelectronics Technology Co., Ltd.
InventorMang Zhao
Life of this patent
Estimating the term…
Abstract
The present disclosure provides a scan-driving circuit and a display device. The scan-driving circuit includes a plurality of series-connecting scan-driving units including an input circuit generating a pull-up control signal and a pull-down control signal; a latch circuit pulling up or pulling down a pull-up control signal point; a processing circuit generating a current scan-driving signal, a cache circuit driving an output of a current scan-driving signal, and a reset circuit clearing the pull-up control signal point. Therefore, it improves driving flexibility and reduces driving power consumption of the display device, and is beneficial to narrow bezel design.
Claims16
A scan-driving circuit comprising a plurality of series-connecting scan-driving units comprising a first scan-driving unit, a plurality of middle scan-driving units, and a last scan-driving unit, the first scan-driving unit, each middle scan-driving unit, and the last scan-driving unit comprising:
- an input circuit, configured to receive a forward-scan control voltage or a backward-scan control voltage, selectively receiving a previous scan-driving signal or a next scan-driving signal according to the forward-scan control voltage or the backward-scan control voltage, and generating a pull-up control signal according to the forward-scan control voltage and the previous scan-driving signal, or generating a pull-down control signal according to the backward-scan control voltage and the next scan-driving signal;
- a latch circuit, connected to the input circuit, configured to pull up a pull-up control signal point according to the pull-up control signal and pull down the pull-up control signal point according to the pull-down control signal;
- a processing circuit, connected to the latch circuit, configured to receive a clock signal and generate a current scan-driving signal according to the clock signal and a signal of the pull-up control signal point;
- a cache circuit, connected to the processing circuit, configured to drive an output of a current scan-driving signal;
- and
- a reset circuit, connected to the latch circuit, configured to receive a reset signal to clear the pull-up control signal point;
- wherein the input circuit comprises a first transmission gate, a second transmission gate, a third transmission gate, and a fourth transmission gate, first control terminals of the first transmission gate and the third transmission gate and second control terminals of the second transmission gate and the fourth transmission gate are connected to the backward-scan control voltage, second control terminals of the first transmission gate and the third transmission gate and the first control terminals of the second transmission gate and the fourth transmission gate are connected to the forward-scan control voltage, input terminals of the first transmission gate and the fourth transmission gate are connected to the previous scan-driving signal, an output terminal of the first transmission gate is connected to an output terminal of the second transmission gate and the latch circuit, the input terminal of the second transmission gate is connected to an input terminal of the third transmission gate and receives the next scan-driving signal, and an output terminal of the third transmission gate is connected to an output terminal of the fourth transmission gate and the latch circuit.
A display device comprising a scan-driving circuit comprising a plurality of series-connecting scan-driving units comprising a first scan-driving unit, a plurality of middle scan-driving units, and a last scan-driving unit, the first scan-driving unit, each middle scan-driving unit, and the last scan-driving unit comprising:
- an input circuit, configured to receive a forward-scan control voltage or a backward-scan control voltage, selectively receiving a previous scan-driving signal or a next scan-driving signal according to the forward-scan control voltage or the backward-scan control voltage, and generating a pull-up control signal according to the forward-scan control voltage and the previous scan-driving signal, or generating a pull-down control signal according to the backward-scan control voltage and the next scan-driving signal;
- a latch circuit, connected to the input circuit, configured to pull up a pull-up control signal point according to the pull-up control signal and pull down the pull-up control signal point according to the pull-down control signal;
- a processing circuit, connected to the latch circuit, configured to receive a clock signal and generate a current scan-driving signal according to the clock signal and a signal of the pull-up control signal point;
- a cache circuit, connected to the processing circuit, configured to drive an output of a current scan-driving signal;
- and
- a reset circuit, connected to the latch circuit, configured to receive a reset signal to clear the pull-up control signal point;
- wherein the input circuit comprises a first transmission gate, a second transmission gate, a third transmission gate, and a fourth transmission gate, first control terminals of the first transmission gate and the third transmission gate and second control terminals of the second transmission gate and the fourth transmission gate are connected to the backward-scan control voltage, second control terminals of the first transmission gate and the third transmission gate and the first control terminals of the second transmission gate and the fourth transmission gate are connected to the forward-scan control voltage, input terminals of the first transmission gate and the fourth transmission gate are connected to the previous scan-driving signal, an output terminal of the first transmission gate is connected to an output terminal of the second transmission gate and the latch circuit, the input terminal of the second transmission gate is connected to an input terminal of the third transmission gate and receives the next scan-driving signal, and an output terminal of the third transmission gate is connected to an output terminal of the fourth transmission gate and the latch circuit.
Dependencies are inferred from the claim text.