Liquid crystal display
View Patent ↗A liquid crystal display is provided, which includes: a liquid crystal panel including a plurality of gate lines, a plurality of data lines, and a plurality of pixels, each pixel including a liquid crystal and a switching element connected to one of the gate lines and one of the data lines; a gate driver applying a gate signal to the gate lines, the gate signal including a first voltage for turning on the switching elements and a second voltage for turning off the switching elements; a data driver applying data voltages to the data lines; a signal controller controlling the gate driver and the data driver; and a voltage supplier applying a control voltage substantially equal to one of the first and the second voltages of the gate signal to the pixels without passing through the switching elements for a control time.
1. A liquid crystal display comprising:
a liquid crystal panel including a plurality of gate lines, a plurality of data lines, and a plurality of pixels, each pixel including a liquid crystal and a switching element connected to one of the gate lines and one of the data lines, and two electrodes selectively forming an electric field in the liquid crystal;
a gate driver applying a gate signal to the gate lines, the gate signal including a first voltage for turning on the switching elements and a second voltage for turning off the switching elements;
a data driver applying data voltages to the data lines;
a signal controller controlling the gate driver and the data driver; and
a voltage supplier applying a control voltage substantially equal to one of the first and the second voltages of the gate signal to one of the two electrodes without passing through the switching elements for a control time, the control time being determined based on a reset signal supplied from an external device to the voltage supplier, and wherein the voltage supplier comprises a first switching unit transmitting the first voltage based on the reset signal, and further wherein the first switching unit comprises:
a first transistor transmitting a third voltage based on the reset signal; and
a second transistor that is turned on by the third voltage to transmit the first voltage.
2. The liquid crystal display of claim 1 , wherein the liquid crystal display is an optically compensated birefringent mode liquid crystal display and the control voltage makes the liquid crystal in an initial bend arrangement.
3. The liquid crystal display of claim 1 , wherein the control voltage is equal to the first voltage of the gate signal.
4. The liquid crystal display of claim 1 , wherein the first switching unit further comprises a voltage divider connected between the first voltage and the third voltage, dividing the voltage difference between the first voltage and the third voltage, and applying the divided voltage to the second transistor.
5. The liquid crystal display of claim 1 , wherein the voltage supplier further comprises a second switching unit that is connected between the panel and the first switching unit, transmits the first voltage to the panel, and blocks a voltage from the panel to the first switching unit.
6. The liquid crystal display of claim 5 , wherein the second switching unit comprises a first set of diodes including at least a diode.
7. The liquid crystal display of claim 6 , wherein the first set of diodes comprises a plurality of diodes connected to different positions of the panel.
8. The liquid crystal display of claim 5 , wherein the voltage supplier further comprises a third switching unit transmitting at least a common voltage to the pixels depending on an output of the second switching unit.
9. The liquid crystal display of claim 8 , wherein the third switching unit comprises a second set of diodes including at least a diode.
10. The liquid crystal display of claim 9 , wherein the second set of diodes comprises a plurality of diodes supplied with respective common voltages and connected to different positions of the panel.
11. The liquid crystal display of claim 1 , wherein the voltage supplier further comprises:
a first diode unit including a plurality of first diodes connected in forward direction from the second transistor to respective positions of the panel; and
a second diode unit including a plurality of second diodes supplied with respective common voltages, each of the second diodes connected to one of the first diodes and to a position of the panel.
12. The liquid crystal display of claim 11 , wherein the voltage supplier further comprises a plurality of resistors, each resistor connected between one of the first diodes and a fourth voltage.
13. An optically compensated birefringent mode liquid crystal display comprising:
a liquid crystal panel including a plurality of gate lines, a plurality of data lines, a plurality of switching elements connected to the gate lines and the data lines, a plurality of pixel electrodes connected to the switching elements, a common electrode disposed opposite the pixel electrodes, and a liquid crystal layer disposed between the pixel electrodes and the common electrode;
a gate driver applying a gate signal to the gate lines, the gate signal including a gate-on voltage for turning on the switching elements and a gate-off voltage for turning off the switching elements;
a data driver applying data voltages to the data lines;
a signal controller controlling the gate driver and the data driver; and
a voltage supplier applying the gate-on voltage to the common electrode for a control time such that the liquid crystal layer is in an initial bend arrangement, wherein the voltage supplier comprises:
a switching unit including a first transistor transmitting a first voltage in response to a reset signal supplied from an external device and a second transistor activated by the first voltage to transmit the first voltage;
a first diode unit including a plurality of first diodes connected in forward direction from the second transistor to respective positions of the common electrode; and
a second diode unit including a plurality of second diodes supplied with respective common voltages, each of the second diodes connected to one of the first diodes and to a position of the common electrode.
14. The liquid crystal display of claim 13 , wherein the panel further comprises a storage electrode line overlapping the pixel electrodes and supplied with the gate-on voltage or a ground voltage.
15. The liquid crystal display of claim 13 , wherein each pixel further comprises a storage capacitor comprising a storage electrode, the pixel electrode, and an insulator layer disposed between the storage electrode and the pixel electrode, wherein the voltage supplier supplies a third voltage to the storage electrode.
16. The liquid crystal display of claim 15 , wherein the third voltage is equal to a ground voltage or the second voltage for the control time.
17. A liquid crystal display comprising:
a liquid crystal panel including a plurality of gate lines, a plurality of data lines, and a plurality of pixels, each pixel including a liquid crystal and a switching element connected to one of the gate lines and one of the data lines, and two electrodes selectively forming an electric field in the liquid crystal;
a gate driver applying a gate signal to the gate lines, the gate signal including a first voltage for turning on the switching elements and a second voltage for turning off the switching elements;
a data driver applying data voltages to the data lines;
a signal controller controlling the gate driver and the data driver; and
a voltage supplier applying a control voltage substantially equal to one of the first and the second voltages of the gate signal to one of the two electrodes without passing through the switching elements for a control time, the control time being determined based on a reset signal supplied from an external device to the voltage supplier, and wherein the voltage supplier comprises:
a first switching unit transmitting the first voltage based on the reset signal; and
a second switching unit that is connected between the panel and the first switching unit, transmits the first voltage to the panel, and blocks a voltage from the panel to the first switching unit.
18. The liquid crystal display of claim 17 , wherein the second switching unit comprises a first set of diodes including at least a diode.
19. The liquid crystal display of claim 18 , wherein the first set of diodes comprises a plurality of diodes connected to different positions of the panel.
20. The liquid crystal display of claim 17 , wherein the voltage supplier further comprises a third switching unit transmitting at least a common voltage to the pixels depending on an output of the second switching unit.
21. The liquid crystal display of claim 20 , wherein the third switching unit comprises a second set of diodes including at least a diode.
22. The liquid crystal display of claim 21 , wherein the second set of diodes comprises a plurality of diodes supplied with respective common voltages and connected to different positions of the panel.
23. The liquid crystal display of claim 17 , wherein the voltage supplier further comprises:
a first diode unit including a plurality of first diodes connected in forward direction from the second transistor to respective positions of the panel; and
a second diode unit including a plurality of second diodes supplied with respective common voltages, each of the second diodes connected to one of the first diodes and to a position of the panel.
24. A liquid crystal display comprising:
a liquid crystal panel including a plurality of gate lines, a plurality of data lines, and a plurality of pixels, each pixel including a liquid crystal and a switching element connected to one of the gate lines and one of the data lines, and two electrodes selectively forming an electric field in the liquid crystal;
a gate driver applying a gate signal to the gate lines, the gate signal including a first voltage for turning on the switching elements and a second voltage for turning off the switching elements;
a data driver applying data voltages to the data lines;
a signal controller controlling the gate driver and the data driver; and
a voltage supplier applying a control voltage substantially equal to one of the first and the second voltages of the gate signal to one of the two electrodes without passing through the switching elements for a control time, the control time being determined based on a reset signal supplied from an external device to the voltage supplier, and wherein the voltage supplier comprises:
a switching unit including a first transistor transmitting a third voltage in response to a reset signal supplied from an external device and a second transistor activated by the third voltage to transmit the first voltage;
a first diode unit including a plurality of first diodes connected in forward direction from the second transistor to respective positions of the panel; and
a second diode unit including a plurality of second diodes supplied with respective common voltages, each of the second diodes connected to one of the first diodes and to a position of the panel.
25. The liquid crystal display of claim 24 , wherein the voltage supplier further comprises a plurality of resistors, each resistor connected between one of the first diodes and a fourth voltage.