Organic electroluminescent display device

Patent metadata

Field	Value
Publication number	US-10769997-B2
Application number	US-201916563534-A
Country	US
Kind code	B2
Filing date	Sep 6, 2019
Priority date	Feb 27, 2006
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

The present invention overcomes image defects such as the brightness inclination or smears by reducing the line resistance of a power source bus line which supplies electricity to organic EL elements. A plurality of pixels which are arranged in a matrix array is connected to power source lines, and the plurality of power source lines are connected to a power source bus line. Both ends of the power source bus line are connected to a power source part via a FPC. By supplying electricity to both ends of the power source bus line from the power source part, the line resistance of the power source bus line can be reduced.

First claim

What is claimed is:

1. An organic EL display device including a display region comprising:
a substrate;
a plurality of pixels in the display region including a cathode;
a first power source bus line electrically connected with the plurality of pixels, the first power source bus line comprising a first portion disposed along a first side of the display region, a second portion disposed along a second side of the display region, and a third portion disposed along a third side of the display region which is connecting the first side and the second side;
a cathode contact electrically connecting the cathode, the cathode contact comprising a first portion extended along a fourth side of the display region which is facing the third side of the display region with the display region therebetween; and
a scanning line drive circuit disposed along the third side of the display region, and transmitting scanning signals to the plurality of pixels,
wherein the first power source bus line and the cathode contact are supplied with different voltage levels from each other, and the third portion of the first power source bus line is disposed between the display region and the scanning line drive circuit, and
wherein the first portion, the second portion, and the third portion of the first power source bus line are positioned outside the display region.

2. The organic EL display device according to claim 1 , wherein the first power source bus line further comprises a fourth portion disposed between the first portion of the cathode contact and the display region.

3. The organic EL display device according to claim 1 , further comprising:
a first flexible print circuit on a side of the substrate.

4. The organic EL display device according to claim 3 , wherein the cathode contact further comprises a second portion which is disposed between the first portion of the first power source bus line and the first flexible print circuit.

5. The organic EL display device according to claim 3 , wherein the first portion of the first power source bus line receives electricity from the first flexible print circuit at both ends of the first portion the first power source bus line.

6. The organic EL display device according to claim 3 , wherein the first portion of the first power source bus line receives electricity from the first flexible print circuit through at least one portion disposed in a middle part of the first power source bus line.

7. The organic EL display device according to claim 3 , further comprising a second flexible print circuit disposed on an opposite side of the substrate to the side where the first flexible print circuit is disposed.

8. An organic EL display device including a display region comprising:
a substrate;
a plurality of pixels in the display region including a cathode;
a first power source bus line electrically connected with the plurality of pixels, the first power source bus line comprising a first portion extended along a first side of the display region, and a second portion extended along a second side of the display region;
a cathode contact electrically connecting the cathode, the cathode contact comprising a first portion disposed along a third side of the display region which is connecting the first side and the second side; and
a scanning line drive circuit disposed along a fourth side of the display region which is facing the first side of the display region with the display region therebetween,
wherein the first power source bus line and the cathode contact are supplied with different voltage levels from each other, and a voltage supplied to the second portion of the first power source bus line is transmitted only through the first portion of the first power source bus line, and
wherein the first portion and the second portion of the first power source bus line are positioned outside the display region.

9. The organic EL display device according to claim 8 , further comprising:
a first flexible print circuit on a side of the substrate.

10. The organic EL display device according to claim 9 , wherein the first portion of the first power source bus line receives electricity from the first flexible print circuit at both ends of the first portion the first power source bus line.

11. The organic EL display device according to claim 9 , wherein the first portion of the first power source bus line receives electricity from the first flexible print circuit through at least one portion disposed in a middle part of the first power source bus line.

12. The organic EL display device according to claim 9 , further comprising:
a data line drive circuit transferring data signals to the plurality of pixels.

13. The organic EL display device according to claim 12 , wherein the first power source bus line receives electricity from the first flexible print circuit through a first path disposed between the data line drive circuit and an edge of the substrate.

14. The organic EL display device according to claim 13 , wherein the cathode contact receives a voltage from the first flexible print circuit through a second path disposed between the first path and the edge of the substrate.

15. The organic EL display device according to claim 14 , wherein the edge of the substrate is adjacent to the third side of the display region.

16. The organic EL display device according to claim 13 , wherein the scanning line drive circuit receives signals from first flexible print circuit through a third path disposed between the first path and the edge of the substrate.

17. The organic EL display device according to claim 16 , wherein the edge of the substrate is adjacent to the fourth side of the display region.

18. The organic EL display device according to claim 9 , wherein the voltage supplied to the second portion of the first power source bus line is transmitted from the first flexible print circuit only through the first portion of the first power source bus line.

19. The organic EL display device according to claim 8 , wherein the first portion of the first power source bus line and the second portion of the first power source bus line are connected each other only on the display region.

Assignees

• Samsung Display Co Ltd

Inventors

• Tokuda Naoki
• Kageyama Hiroshi
• Furuie Masamitsu

Classifications

• H10K59/1315

  comprising structures specially adapted for lowering the resistance · CPC title

• H05B44/00

  Circuit arrangements for operating electroluminescent light sources (for operating light emitting diodes H05B45/00) · CPC title

• Y02B20/30

  Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] · CPC title

• G09G2330/00

  Aspects of power supply; Aspects of display protection and defect management · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title