Scan driving apparatus, flat panel display having the same, and driving method thereof
View Patent ↗A scan driving apparatus having decreased size and power consumption, a flat panel display having the same, and a driving method thereof. The scan driving apparatus comprises a shift register generating output signals shifted in sequence in response to a clock signal, and a scan signal generator generating at least four scan signals in a cycle of the clock signal based on the output signals from the shift register and at least two control signals.
1. A scan driving apparatus, comprising:
a shift register generating output signals shifted in sequence in response to a clock signal; and
a scan signal generator,
wherein the scan signal generator generates at least four scan signals in a cycle of the clock signal based on the output signals from the shift register and at least a first control signal and a second control signal.
2. The scan driving apparatus of claim 1 ,
wherein the shift register comprises n/2+1 registers, and
wherein n is a positive integer.
3. The scan driving apparatus of claim 2 ,
wherein the scan signal generator comprises n NAND gates, and
wherein a NAND gate generates a scan signal based on output signals from the shift register and the first control signal or the second control signal.
4. The scan driving apparatus of claim 3 , wherein the first control signal and the second control signal have a same cycle and start at different times.
5. The scan driving apparatus of claim 4 ,
wherein odd NAND gates generate the scan signal based on the first control signal and output signals from an i th register and an (i+1) th register,
wherein even NAND gates generate the scan signal based on the second control signal and the output signals from the i th register and the (i+1) th register, and
wherein i is a positive integer of 1 or more.
6. The scan driving apparatus of claim 5 ,
wherein output signals of a 1 st register are transmitted to a 1 st NAND gate and a 2 nd NAND gate;
wherein output signals of a (n/2+1) th register are transmitted to a (n−1) th NAND gate and a n th NAND gate; and
wherein output signals of a 2 nd register through a (n/2) th register are transmitted to four NAND gates, respectively.
7. The scan driving apparatus of claim 6 ,
wherein output signals of a j th register among the 2 nd register through the (n/2) th register are transmitted to a (k−3) th NAND gate, a (k−2) th NAND gate, a (k−1) th NAND gate, and a k th NAND gate,
wherein j=2, 3, 4, . . . , n/2, and
wherein k=2×j.
8. The scan driving apparatus of claim 7 , wherein output signals of two adjacent registers among the 2 nd register through the (n/2) th register are transmitted to two adjacent NAND gates.
9. A flat panel display, comprising:
an image display part having a plurality of pixels defined by n scan lines and m data lines;
a scan driver outputting at least four scan signals in sequence to the scan lines in a cycle of a clock signal; and
a data driver transmitting a data signal to the data lines.
10. The flat panel display of claim 9 , further comprising:
a controller;
wherein the controller transmits a start pulse, a first control signal and a second control signal to the scan driver, and
wherein the controller transmits a data control signal to drive the data driver.
11. The flat panel display of claim 10 , wherein the scan driver comprises:
a shift register shifting the start pulse from the controller in sequence and outputting output signals in response to the clock signal; and
a scan signal generator generating a scan signal based on the output signals from the shift register and at least the first control signal and the second control signal.
12. The flat panel display of claim 11 ,
wherein the shift register comprises n/2+1 registers.
13. The flat panel display of claim 12 ,
wherein the scan signal generator comprises n NAND gates, and
wherein a NAND gate generates the scan signal based on the output signals from the shift register and the first control signal or the second control signal.
14. The flat panel display of claim 13 , wherein the first control signal and the second control signal have a same cycle and start at different times.
15. The flat panel display of claim 14 ,
wherein odd NAND gates generate the scan signal based on the first control signal and output signals from an i th register and an (i+1) th register,
wherein even NAND gates generate the scan signal based on the second control signal and the output signals from the i th register and the (i+1) th register, and
wherein i is a positive integer of 1 or more.
16. The flat panel display of claim 15 ,
wherein output signals of a 1 st register are transmitted to a 1 st NAND gate and a 2 nd NAND gate;
wherein output signals of a (n/2+1) th register are transmitted to a (n−1) th NAND gate and a n th NAND gate; and
wherein output signals of a 2 nd register through a (n/2) th register are transmitted to four NAND gates, respectively.
17. The flat panel display of claim 16 ,
wherein output signals of a j th register among the 2 nd register through the (n/2) th register are transmitted to a (k−3) th NAND gate, a (k−2) th NAND gate, a (k−1) th NAND gate, and a k th NAND gate,
wherein j=2, 3, 4, . . . , n/2, and
wherein k=2×j.
18. The flat panel display of claim 17 , wherein output signals of two adjacent registers among the 2 nd register through the (n/2) th register are transmitted to two adjacent NAND gates.
19. The flat panel display of claim 9 , wherein the data driver transmits the data signal corresponding to at least four horizontal lines to a data line in the cycle of the clock signal.
20. A method of driving a flat panel display comprising an image display part having a plurality of pixels defined by n scan lines and m data lines, the method comprising:
transmitting at least four scan signals in sequence to the scan lines in a cycle of a clock signal; and
transmitting a data signal synchronized with the scan signals to the data lines.
21. The method of claim 20 , wherein transmitting the scan signals in sequence comprises:
allowing n/2+1 registers to shift start pulses in sequence and transmit output signals in response to the clock signal; and
using n NAND gates to generate a scan signal based on a first control signal and a second control signal and output signals of the registers.
22. The method of claim 21 , wherein the first control signal and the second control signal have a same cycle and start at different times.
23. The method of claim 22 , wherein transmitting the data signal comprises transmitting the data signal corresponding to at least four horizontal lines to a data line in the cycle of the clock signal.