Organic light emitting display device and method of driving the same
View Patent ↗An organic light emitting display device is disclosed. The device has a drive circuit which generates a reference clock to be used for synchronizing data signals supplied to the pixels. The reference clock is based on the frame frequency. As a result, the display will provide images of consistent quality which do not vary with input data frequency.
1. An organic light emitting display device, comprising:
a plurality of scan lines;
a plurality of data lines;
a pixel unit including a plurality of pixels, each pixel connected to the scan lines and the data lines; and
a drive circuit unit configured to receive a first synchronizing signal having a first frequency, and to supply a scan signal and a data signal to the scan lines and the data lines, respectively, wherein the scan signal and the data signal are supplied at a frequency determined by the frequency of the received synchronizing signal, and wherein the data signal is supplied to the pixels only for a duration,
wherein the drive circuit unit is further configured to receive a second synchronizing signal having a second frequency different from the first frequency, and to supply a scan signal and a data signal to the scan lines and the data lines, respectively, wherein the scan signal and the data signal are supplied at a frequency determined by the frequency of the second synchronizing signal, and wherein the data signal is supplied to the pixels only for the duration which remains constant regardless of the first and second frequencies.
2. The organic light emitting display device according to claim 1 , wherein the drive circuit unit is configured to generate a reference clock in response to the received synchronizing signal, the reference clock having a frequency based on the frequency of the synchronizing signal, and wherein the drive circuit controls the duration that the data signal is supplied to the pixels according to the reference clock.
3. The organic light emitting display device according to claim 2 , wherein the drive circuit unit comprises:
a timing controller to generate the reference clock; and
a scan driver to generate the scan signal having a pulse width corresponding to the reference clock.
4. The organic light emitting display device according to claim 2 , wherein the drive circuit unit comprises:
a timing controller to generate the reference clock; and
a data driver to supply the data signal to the data lines during a period corresponding to the reference clock.
5. The organic light emitting display device according to claim 2 , wherein the drive circuit unit comprises:
a timing controller to generate the reference clock;
a data signal generation unit to generate the data signal; and
a data distributor unit to distribute and output the data signal into the data lines,
wherein the data distributor unit is configured to control the duration that the data signal is output to the data lines according to a control signal corresponding to the reference clock.
6. The organic light emitting display device according to claim 1 , wherein the duration of the data signal is based on a highest selectable frequency of the synchronizing signal.
7. The organic light emitting display device according to claim 2 , wherein the drive circuit unit receives a vertical synchronizing signal and a horizontal synchronizing signal, and generates the reference clock in response to the horizontal synchronizing signal.
8. A method of driving an organic light emitting display device having a plurality of pixels, a plurality of scan lines and a plurality of data lines, the method comprising:
receiving a first synchronizing signal;
generating a data signal having a frequency determined by the first synchronizing signal, wherein the data signal is supplied to the pixels for a duration;
receiving a second synchronizing signal having a second frequency different from the first frequency; and
supplying a scan signal and a data signal to the scan lines and the data lines, respectively,
wherein the scan signal and the data signal are supplied at a frequency determined by the frequency of the second synchronizing signal, and wherein the data signal is supplied to the pixels only for the duration which remains constant regardless of the first and second frequencies.
9. The method of driving an organic light emitting display device according to claim 8 , further comprising:
generating a control signal that controls the duration that the data signal is supplied to the pixels;
generating a scan signal having a pulse width corresponding to the control signal; and
supplying the scan signal to the pixels.
10. The method of driving an organic light emitting display device according to claim 8 , further comprising:
generating a control signal that controls the duration that the data signal is supplied to the pixels; and
supplying the data signal to the pixels according to the control signal.
11. The method of driving an organic light emitting display device according to claim 8 , wherein the duration that the data signal is supplied to the pixels is based on a highest selectable frequency of the synchronizing signal.
12. An organic light emitting display device, comprising:
a pixel unit including a plurality of pixels; and
a drive circuit unit configured to receive a first synchronizing signal having a first frequency, and a reference clock having the same frequency as the first synchronizing signal, and to generate a scan signal and a data signal based on the reference clock and based on the frequency of the first synchronizing signal, wherein the data signal is supplied to the pixels for a duration,
wherein the drive circuit unit is further configured to receive a second synchronizing signal having a second frequency different from the first frequency, and to supply a scan signal and a data signal to the scan lines and the data lines, respectively, wherein the scan signal and the data signal are supplied at a frequency determined by the frequency of the second synchronizing signal, and wherein the data signal is supplied to the pixels only for the duration which remains constant regardless of the first and second frequencies.
13. The device of claim 12 , wherein the drive circuit receives data at a frequency different from frame frequency of the reference clock.
14. The device of claim 12 , wherein the drive circuit generates the scan signal with an active time corresponding to the reference clock.
15. The device of claim 12 , wherein the reference clock has a frequency corresponding to a frame frequency.
16. The device of claim 12 , wherein the drive circuit generates the data signal with an active time based on the reference clock.
17. The device of claim 12 , wherein the drive circuit generates the scan signal with an active time corresponding to a highest selectable frequency of the synchronizing signal.
18. The device of claim 12 , wherein the reference clock has a frequency corresponding to a highest selectable frequency of the synchronizing signal.
19. The organic light emitting display device according to claim 2 , wherein the drive circuit unit comprises:
a timing controller including a reference clock generation unit configured to generate the reference clock in response to the synchronizing signal; and
a control signal generation unit configured to generate a control signal that controls the duration that the data signal is supplied to the pixels according to the reference clock.
20. The method of claim 8 , further comprising:
generating a reference clock in response to the synchronizing signal, the reference clock having a frequency based on the frequency of the synchronizing signal; and
controlling the duration that the data signal is supplied to the pixels according to the reference clock.