Method and apparatus for driving a display
View Patent ↗A method for driving a display having display cells with capacitors coupled to gate lines. The method comprises the steps of floating the gates of the transistors of the Nth and (N+1)th display cell, applying a high voltage level to the gate of the transistor of the Nth display cell to turn it on and keeping the gate of the transistor of the (N+1)th display cell floated, applying a low voltage level to the gate of the transistor of the Nth display cell to turn it off and the first voltage level to the gate of the transistor of the (N+1)th display cell to turn it on, and floating the gate of the transistor of the Nth display cell and applying the low voltage level to the gate of the transistor of the (N+1)th display cell to turn it off.
1. A method for driving a display having a first and second display cell, each of which comprises a transistor and capacitor, the capacitor of the second display cell being coupled to a gate of the transistor of the first display cell, the method comprising the steps of:
floating the gates of the transistors of the first and second display cell;
applying a first voltage level to the gate of the transistor of the first display cell to turn on the transistor of the first cell and keeping the gate of the transistor of the second display cell floated;
applying a second voltage level to the gate of the transistor of the first display cell to turn off the transistor of the first display cell and the first voltage level to the gate of the transistor of the second display cell to turn on the transistor of the second display cell; and
floating the gate of the transistor of the first display cell and applying the second voltage level to the gate of the transistor of the second display cell to turn off the transistor of the second display cell.
2. The method as claimed in claim 1 , wherein each of the transistors of the first and second display cell has a drain coupled to receive a data signal and the capacitor of the second display cell is coupled between a source of the transistor of the second display cell and the gate of the transistor of the first display cell.
3. The method as claimed in claim 2 , wherein each of the first and second display cells further comprises a liquid crystal cell controlled by a voltage difference between a common electrode and the source of the transistor.
4. The method as claimed in claim 3 further comprising the steps of: alternatively applying the first voltage level and a third voltage level between the first and second voltage level to the common electrode.
5. An apparatus for driving a display having a first and second display cell, each of which comprises a transistor and capacitor, the capacitor of the second transistor being coupled to a gate of the transistor of the first display cell, the apparatus comprising:
a first and second gate signal generator, each of the first and second gate signal generators comprising:
a first and second input terminal, and a gate signal output terminal, the first input terminal of the first gate signal generator receiving a first pulse train, the second input terminal of the first gate signal generator and the first input terminal of the second gate signal generator commonly receiving a second pulse train, the second input terminal of the second gate signal generator receiving a third pulse, and the gate signal output terminals of the first and second gate signal generators coupled to gates of the transistors of the first and second display cells respectively;
an inverter having an input terminal coupled to the first input terminal;
a first transistor of a first type having a gate coupled to an output terminal of the inverter and a source coupled to receive a first voltage;
a second transistor of a second type having a gate coupled to the output terminal of the inverter, a drain coupled to the source of the first transistor and a source coupled to receive a second voltage;
a third transistor of the second type having a gate coupled to the output terminal of the inverter, a drain coupled to the gate signal output terminal and a source coupled to a drain of the first transistor; and
a fourth transistor of the first type having a gate coupled to the second input terminal, a drain coupled to the gate signal output terminal and a source coupled to receive the first voltage.
6. The apparatus as claimed in claim 5 , wherein each of the transistors of the first and second display cell has a drain coupled to receive a data signal and the capacitor of the second display cell is coupled between a source of the transistor of the second display cell and the gate of the transistor of the first display cell.
7. The apparatus as claimed in claim 6 , wherein each of the first and second display cell further comprises a liquid crystal cell controlled by a voltage difference between a common electrode and the source of the transistor.
8. The apparatus as claimed in claim 7 , wherein the common electrode is alternatively applied to the first voltage level and a third voltage level between the first and second voltage level.