Driving apparatus for display device that uses control signals based on sum of clock signals
View Patent ↗A driving apparatus for a display device that is capable of lowering the manufacturing cost for different types of gate driving integrated circuits is presented. The apparatus has pixels arranged in a matrix, each pixel having a first and a second subpixels. A gate driver has a plurality of gate driving circuits, and each of the plurality of gate driving circuits generates first and second gate signals that are applied to the first and second subpixels, respectively. A controller outputs control signals for controlling the output of a carry signal for each of the gate driving circuits. Where an OR gate serves as the controller, two types of gate signals for different pixel rows can be generated: a first type where gate signals are applied to the different pixel rows at the same time and a second type where gate signals are not applied at the same time.
1. A driving apparatus for a display device, which has a plurality of pixels arranged in a matrix, each of the plurality of pixels having first and second subpixels, the driving apparatus comprising:
a gate driver that comprises a plurality of gate driving circuits, each of the plurality of gate driving circuits generating first and second gate signals and applying the first and second gate signals to the first and second subpixels, respectively; and
a controller that outputs control signals for controlling an output of a carry signal for each of the plurality of gate driving circuits,
wherein the control signals are logical sums of first and second clock signals.
2. The driving apparatus for a display device of claim 1 , wherein the controller comprises a logic circuit.
3. The driving apparatus for a display device of claim 2 , wherein each of the plurality of gate driving circuits and an OR gate of the logic circuit receives the first and second clock signals having high and low levels.
4. The driving apparatus for a display device of claim 3 , wherein:
the control signals include first or second signals each having first and second states; and
each of the plurality of gate driving circuits outputs the carry signal in synchronization with a falling edge of the last signal among the second gate signals when the first signal is input, or outputs the carry signal in synchronization with a falling edge of the last signal among the first gate signals when the second signal is input.
5. The driving apparatus for a display device of claim 4 , wherein the first state includes both high and low values, and the second state includes only high value.
6. The driving apparatus for a display device of claim 4 , wherein the first gate signal is output earlier than the second gate signal.
7. The driving apparatus for a display device of claim 1 , wherein the first gate signal is output earlier than the second gate signal.
8. The driving apparatus for a display device of claim 7 , wherein each of the plurality of gate driving circuits outputs the carry signal in synchronization with a falling edge of the last signal among the second gate signals according to control signals of the controller.
9. The driving apparatus for a display device of claim 8 , wherein the first and second gate signals for different pixel rows do not overlap each other.
10. The driving apparatus for a display device of claim 9 , wherein the controller comprises an OR gate.
11. The driving apparatus for a display device of claim 1 , wherein each of the plurality of gate driving circuits outputs the carry signal in synchronization with a falling edge of the last signal among the first gate signals according to the control signals of the controller.
12. The driving apparatus for a display device of claim 11 , wherein the first and second gate signals for different pixel rows overlap each other.
13. The driving apparatus for a display device of claim 12 , wherein the first gate signal is output earlier than the second gate signal.
14. The driving apparatus for a display device of claim 13 , wherein the controller comprises an OR gate.
15. A display device, comprising:
a plurality of pixels that are arranged in a matrix, each of the plurality of pixels having first and second subpixels;
a plurality of first gate lines that are connected to the first subpixels and transmit first gate signals;
a plurality of second gate lines that are connected to the second subpixels and transmit second gate signals;
a gate driver that has a plurality of gate driving circuits, each of the plurality of gate driving circuits generating the first and second gate signals; and
a controller that outputs control signals for controlling output of a carry signal for each of the plurality of gate driving circuits,
wherein the control signals are logical sums of first and second clock signals.
16. The display device of claim 15 , wherein the controller comprises an OR gate.
17. The display device of claim 16 , wherein each of the plurality of gate driving circuits and the OR gate receives the first and second clock signals having high and low levels.
18. The display device of claim 17 , wherein:
the control signals include first and second signals each having first and second states; and
each of the plurality of gate driving circuits outputs the carry signal in synchronization with a falling edge of the last signal among the second gate signals when the first signal is input, or outputs the carry signal in synchronization with a falling edge of the last signal among the first gate signals when the second signal is input.
19. The display device of claim 18 , wherein the first state includes both high and low values, and the second state includes only the high value.
20. The display device of claim 19 , wherein the first gate signal is output earlier than the second gate signal.
21. The display device of claim 20 , wherein the display device is a liquid crystal display.