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US 9,318,218 B2Granted
Shift register and driving circuit for liquid crystal display
AssigneeCentury Technology (Shenzhen) Corporation Limited
InventorsMing-Tsung Wang, Wen-Lin Mei, Hui Wang, Chia-Hua Huang
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Abstract
A shift register for an LCD display includes N shift register units. Each shift register unit outputs a shift signal. An Nth shift register unit includes a waveform-shaping unit electrically coupled to an shift signal output terminal of the Nth register to perform a waveform-shaping operation on the Nth shift signal according to the (N+1)th shift signal output by an (N+1)th shift register, to reduce the feed-through effect which causes display flicker.
Claims16
A shift register comprising:
- a plurality of shift register units, each shift register unit outputting a shift signal, an Nth shift register unit comprising:
- a starting unit electrically coupled to an (N−1)th shift register and outputting a first driving signal according to an (N−1)th shift signal output by an (N−1)th shift register;
- a pull-up unit electrically coupled between the starting unit and a shift signal output terminal of the Nth shift register unit and pulling up an Nth shift signal output by an Nth shift register according to the first driving signal and a first clock signal;
- a pull-down unit electrically coupled between the starting unit and the shift signal output terminal of the Nth shift register unit and pulling down the first driving signal;
- a control unit electrically coupled between the starting unit and the pull-down unit to control a working time of the pull-down unit according to an (N+2)th shift signal, a first control signal, and a second control signal;
- and
- a waveform-shaping unit electrically coupled to the shift signal output terminal of the Nth register to perform a waveform-shaping operation on the Nth shift signal according to the (N+1)th shift signal;
- wherein each of the shift register units comprises a first cascade signal output terminal, a first cascade signal input terminal, a second cascade signal input terminal, a second cascade signal output terminal, a first feedback terminal, and a second feedback terminal;
- the first cascade signal output terminal of the Nth shift register unit is electrically coupled to the first cascade signal output terminal of an (N+1)th shift register unit, the first cascade signal output terminal of the Nth shift register unit is electrically coupled to the first cascade signal input terminal of the (N−1)th shift register unit, the second cascade signal output terminal of the Nth shift register unit is electrically coupled to the second cascade signal input terminal of the (N−1)th shift register unit, the first feedback terminal of the Nth shift register unit receives the (N+1)th shift signal, and the second feedback terminal of the Nth shift register unit receives the (N+2)th shift signal.
6 more elements
A liquid crystal display comprising:
- a display panel, a date driver, and a gate driver;
- the gate driver comprising a shift register comprising:
- a plurality of shift register units, each shift register unit outputting a shift signal, an Nth shift register unit comprising:
- a staring starting unit electrically coupled to an (N−1)th shift register and outputting a first driving signal according to an (N−1)th shift signal output by an (N−1)th shift register;
- a pull-up unit electrically coupled between the starting unit and a shift signal output terminal of the Nth shift register unit and pulling up an Nth shift signal output by an Nth shift register according to the first driving signal and a first clock signal;
- a pull-down unit electrically coupled between the starting unit and a shift signal output terminal of the Nth shift register unit and pulling down the first driving signal;
- a control unit electrically coupled between the starting unit and the pull-down unit to control a working time of the pull-down unit according to an (N+2)th shift signal, a first control signal, and a second control signal;
- and
- a waveform-shaping unit electrically coupled to the shift signal output terminal of the Nth register to perform a waveform-shaping operation on the Nth shift signal according to the (N+1)th shift signal;
- wherein each of the shift register units comprises a first cascade signal output terminal, a first cascade signal input terminal, a second cascade signal input terminal, a second cascade signal output terminal, a first feedback terminal, and a second feedback terminal;
- the first cascade signal output terminal of the Nth shift register unit is electrically coupled to the first cascade signal output terminal of an (N+1)th shift register unit, the first cascade signal output terminal of the Nth shift register unit is electrically coupled to the first cascade signal input terminal of the (N−1)th shift register unit, the second cascade signal output terminal of the Nth shift register unit is electrically coupled to the second cascade signal input terminal of the (N−1)th shift register unit, the first feedback terminal of the Nth shift register unit receives the (N+1)th shift signal, and the second feedback terminal of the Nth shift register unit receives the (N+2)th shift signal.
8 more elements
Dependencies are inferred from the claim text.