Organic light emitting display
View Patent ↗Disclosed is an organic light emitting display which has a scan driver to supply scan signals to a plurality of scan lines, a data driver to supply data signal to output lines, with a demultiplexer on each output line to supply the data signal to a plurality of data lines is disclosed. The display also has a pixel portion comprising pixels connected to the scan lines, the data lines, and pixel power source lines. There is also a power source line placed between the pixel portion and the data driver to supply first power to the pixel power source lines, and a parasitic capacitor formed on each data line to charge voltage corresponding to the data signal. With this configuration, the number of output lines provided in a data driver is decreased, and an image is displayed with uniform brightness.
1. An organic light emitting display comprising:
a scan driver configured to supply scan signals to a plurality of scan lines;
a data driver configured to supply data signals to a plurality of output lines;
a plurality of demultiplexers, each configured to selectively supply the data signals from a single output line to a plurality of data lines;
a pixel portion comprising a plurality of pixels, the pixel portion being connected to the scan lines, the data lines, and a plurality of pixel power source lines;
a first power source line connected to the pixel power source lines at a first end of each of the pixel power source lines; and
a plurality of capacitors, wherein each of the capacitors is configured to store a charge corresponding to the data signal on a corresponding data line,
wherein an auxiliary power source line is placed between the pixel portion and the data driver and is connected to the pixel power source lines at a second end of each of the pixel power source lines,
wherein a first of the capacitors has a first width and a first capacitance, and the first capacitor is formed by a first data line having the first width and the auxiliary power source line, and a second of the capacitors has a second width and a second capacitance, and the second capacitor is formed by a second data line having the second width and the auxiliary power source line, and wherein the first and second widths are different and the first and second capacitances are substantially equal, and
wherein the scan driver supplies the scan signals during a first period defined in one horizontal period, and the data driver supplies the data signals to the plurality of output lines during a second period defined in the one horizontal period, wherein the first and second periods do not overlap.
2. The organic light emitting display according to claim 1 , wherein the width of a data line at an edge portion of the auxiliary power source line is less than the width of a data line at a center portion of the auxiliary power source line.
3. The organic light emitting display according to claim 1 , wherein each demultiplexer comprises a plurality of transistors, each connected to a separate data line.
4. The organic light emitting display according to claim 3 , wherein the plurality of transistors are configured to be turned on in sequence to sequentially supply the data signals to each of the separate different data lines, and the capacitors associated with the corresponding separate data lines are configured to sequentially store charge according to the data signals on the corresponding separate data lines.
5. The organic light emitting display according to claim 4 , wherein a voltage stored on a capacitor is supplied to a pixel during the first period.
6. An organic light emitting display comprising:
a scan driver configured to supply scan signals to a plurality of scan lines;
a data driver configured to supply the data signals to a plurality of output lines;
a plurality of demultiplexers, each configured to selectively supply data signals from a single output line to a plurality of data lines;
a pixel portion comprising a plurality of pixels, the pixel portion being connected to the scan lines, the data lines, and a plurality of pixel power source lines;
a first power source line connected to the pixel power source lines at a first end of each of the pixel power source lines; and
a plurality of capacitors, wherein each of the capacitors is configured to store a charge corresponding to the data signal on a corresponding data line,
wherein an auxiliary power source line is placed between the pixel portion and the data driver and is connected to the pixel power source lines at a second end of each of the pixel power source lines,
wherein a first of the capacitors has a first width and a first capacitance, and the first capacitor is formed by a first data line having the first width and the auxiliary power source line, and a second of the capacitors has a second width and a second capacitance, and the second capacitor is formed by a second data line having the second width and the auxiliary power source line, and wherein the first and second widths are different and the first and second capacitances are substantially equal, and wherein the auxiliary power source line has a center portion wider than an edge portion, and
wherein the scan driver supplies the scan signals during a first period defined in one horizontal period, and the data driver supplies the data signals to the plurality of output lines during a second period defined in the one horizontal period, wherein the first and second periods do not overlap.
7. The organic light emitting display according to claim 6 , wherein the width of the auxiliary power source line is narrower at an edge portion than at a center portion.
8. The organic light emitting display according to claim 6 , wherein each demultiplexer comprises a plurality of transistors, each connected to a separate data line.
9. The organic light emitting display according to claim 8 , wherein the plurality of transistors are configured to be turned on in sequence so as to sequentially supply the data signals to each of the separate different data lines, and the capacitors associated with the corresponding separate data lines are configured to sequentially store charge according to the data signals on the corresponding separate data lines.
10. The organic light emitting display according to claim 9 , wherein a voltage stored on a capacitor is supplied to a pixel during the first period.
11. An organic light emitting display comprising:
a scan driver configured to supply scan signals to a plurality of scan lines;
a data driver configured to supply the data signals to a plurality of output lines;
a plurality of demultiplexers, each configured to selectively supply data signals from a single output line to a plurality of data lines;
a pixel portion comprising a plurality of pixels, the pixel portion being connected to the scan lines, the data lines, and a plurality of pixel power source lines;
a first power source line connected to the pixel power source lines at a first end of each of the pixel power source lines; and
a plurality of capacitors, wherein each of the capacitors is configured to store a charge corresponding to the data signal on a corresponding data line,
wherein an auxiliary power source line is placed between the pixel portion and the data driver and is connected to the pixel power source lines at a second end of each of the pixel power source lines,
wherein a first of the capacitors has a first width and a first capacitance, and the first capacitor is formed by a first data line having the first width and the auxiliary power source line, and a second of the capacitors has a second width and a second capacitance, and the second capacitor is formed by a second data line having the second width and the auxiliary power source line, and wherein the first and second widths are different and the first and second capacitances are substantially equal, and each of the first and second data lines has a bend, and
wherein the scan driver supplies the scan signals during a first period defined in one horizontal period, and the data driver supplies the data signals to the plurality of output lines during a second period defined in the one horizontal period, wherein the first and second periods do not overlap.
12. The organic light emitting display according to claim 11 , wherein a length of one of the data lines at an edge portion of the auxiliary power line than is less than a length of another one of the data lines at a center portion of the auxiliary power line.
13. The organic light emitting display according to claim 11 , wherein each demultiplexer comprises a plurality of transistors, each connected to a separate data line.
14. The organic light emitting display according to claim 13 , wherein the plurality of transistors are configured to be turned on in sequence so as to sequentially supply the data signals to each of the separate different data lines, and the capacitors associated with the corresponding separate data lines are configured to sequentially store charge according to the data signals on the corresponding separate data lines.
15. The organic light emitting display according to claim 14 , wherein a voltage stored on a capacitor is supplied to a pixel during the first period.
16. An organic light emitting display comprising:
a scan driver configured to supply scan signals to a plurality of scan lines;
a data driver configured to supply data signals to a plurality of output lines;
a plurality of demultiplexers, each configured to selectively supply the data signals from a single output line to a plurality of data lines;
a pixel portion comprising a plurality of pixels, the pixel portion being connected to the scan lines, the data lines, and pixel power source lines;
a first power source line connected to the pixel power source lines at a first end of each of the pixel power source lines;
a plurality of capacitors, wherein each of the capacitors is configured to store a charge corresponding to the data signal on a corresponding data line,
wherein an auxiliary power source line is placed between the pixel portion and the data driver and is connected to the pixel power source lines at a second end of each of the pixel power source lines,
wherein a first of the capacitors has a first width and a first capacitance, and the first capacitor is formed by a first data line having the first width and the auxiliary power source line, and a second of the capacitors has a second width and a second capacitance, and the second capacitor is formed by a second data line having the second width and the auxiliary power source line, and wherein the first and second widths are different and the first and second capacitances are substantially equal, and each of the first and second data lines has a bend, and
wherein a length of one of the two data lines at an edge portion of the auxiliary power line than is less than a length of another one of the data lines at a center portion of the auxiliary power line, and the surface area of each of the plurality of capacitors is substantially equal to the surface area of each of the other capacitors.
17. The organic light emitting display according to claim 16 , wherein the width of a data line at an edge portion of the auxiliary power source line is less than the width of a data line at a center portion of the auxiliary power source line.
18. The organic light emitting display according to claim 16 , wherein the width of the auxiliary power source line is narrower at an edge portion than at a center portion.
19. The organic light emitting display according to claim 16 , wherein the scan driver supplies the scan signals during a first period defined in one horizontal period, and the data driver supplies the data signals to the plurality of output lines during a second period defined in the one horizontal period, wherein the first and second periods do not overlap.
20. The organic light emitting display according to claim 19 , wherein each demultiplexer comprises a plurality of transistors, each connected to a separate data line.
21. The organic light emitting display according to claim 20 , wherein the plurality of transistors are configured to be turned on in sequence to sequentially supply the data signals to each of the separate different data lines, and the capacitors associated with the corresponding separate data lines are configured to sequentially store charge according to the data signals on the corresponding separate data lines.
22. The organic light emitting display according to claim 21 , wherein a voltage stored on a capacitor is supplied to a pixel during the first period.