Display device and method of repairing the same

Patent metadata

Field	Value
Publication number	US-2016335950-A1
Application number	US-201615136606-A
Country	US
Kind code	A1
Filing date	Apr 22, 2016
Priority date	May 13, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

A display device and a method of repairing the same are disclosed. In one aspect, the display device includes an OLED, a repair line electrically connected to a first dummy pixel and a second dummy pixel, and a repair modulation circuit electrically connected to the first and second dummy pixels. The first dummy pixel includes a first dummy pixel driving circuit configured to output a driving current corresponding to a data voltage of a selected pixel of the OLED to the repair line, when the selected pixel becomes defective, based on a first light emission control signal. The repair modulation circuit includes a capacitor configured to be initialized before the driving current is output from the first dummy pixel driving circuit. The capacitor of the repair modulation circuit is configured to be charged with the driving current when the driving current is output from the first dummy pixel driving circuit.

First claim

What is claimed is:

1 . A display device, comprising:
an organic light-emitting diode (OLED); a repair line electrically connected to a first dummy pixel and a second dummy pixel; and a repair modulation circuit electrically connected to the first and second dummy pixels, wherein the first dummy pixel includes a first dummy pixel driving circuit configured to output a driving current corresponding to a data voltage of a selected pixel of the OLED to the repair line, when the selected pixel becomes defective, based on a first light emission control signal, wherein the repair modulation circuit includes a capacitor configured to be initialized before the driving current is output from the first dummy pixel driving circuit, wherein the capacitor of the repair modulation circuit is configured to be charged with the driving current when the driving current is output from the first dummy pixel driving circuit, and wherein the capacitor is further configured to share the charged current with a parasitic capacitance of the repair line.

2 . The display device of claim 1 , wherein the first dummy pixel, the second dummy pixel, and the repair modulation circuit are electrically connected to a sub repair line, and wherein the first and second dummy pixels share the repair modulation circuit via the sub repair line.

3 . The display device of claim 2 , wherein the second dummy pixel includes a second dummy pixel driving circuit configured to apply a driving current corresponding to a first data voltage to the repair line based on a second light emission control signal, and wherein the first data voltage includes a black gray data voltage.

4 . The display device of claim 3 , wherein the repair modulation circuit further includes a transistor electrically connected between the capacitor and the repair line and configured to be turned on or off based on the first light emission control signal.

5 . The display device of claim 4 , wherein the repair modulation circuit further includes an initialization transistor electrically connected between the capacitor and a voltage line configured to provide an initialization voltage, and wherein the initialization transistor is configured to be turned on or off based on a first initialization signal.

6 . The display device of claim 5 , wherein a voltage level of the first initialization signal is configured to be changed from a first level to a second level to turn on the initialization transistor before the driving current is output to the repair line.

7 . The display device of claim 6 , wherein the first dummy pixel driving circuit is configured to provide the driving current to the repair line after the initialization transistor is turned on.

8 . The display device of claim 7 , further comprising a third dummy pixel electrically connected to the repair line and including a third dummy pixel driving circuit configured to apply a driving current corresponding to a second data voltage to the repair line based on a third light emission control signal, and wherein the second data voltage includes a black gray data voltage.

9 . A method of repairing a display device including a repair line electrically connected to a first dummy pixel and a second dummy pixel, and a repair modulation circuit electrically connected to the first and second dummy pixels, the method comprising:
electrically connecting the repair line to an organic light-emitting diode (OLED) of a defective pixel in the display device, wherein the first dummy pixel includes a first dummy pixel driving circuit, and wherein the repair modulation circuit includes a capacitor; initializing the capacitor; providing a driving current corresponding to a data voltage of the defective pixel to the repair line in the first dummy pixel; charging the capacitor with the driving current when the driving current is output from the first dummy pixel driving circuit; and sharing the charged current of the capacitor with a parasitic capacitance of the charged capacitor and the repair line.

10 . The method of claim 9 , further comprising:
electrically connecting the first dummy pixel, the second dummy pixel, and the repair modulation circuit to a sub repair line; and sharing the repair modulation circuit between the first and second dummy pixels.

11 . The method of claim 10 , wherein the second dummy pixel includes a second dummy pixel driving circuit, wherein the method further comprises applying a driving current corresponding to a first data voltage to the repair line based on a second light emission control signal, and wherein the first data voltage includes a black gray data voltage.

12 . The method of claim 11 , wherein the repair modulation circuit further includes a transistor electrically connected between the capacitor and the repair line and configured to be turned on or off based on the first light emission control signal.

13 . The method of claim 12 , wherein the repair modulation circuit further includes an initialization transistor electrically connected between the capacitor and a voltage line configured to provide an initialization voltage, and wherein the initialization transistor is configured to be turned on or off based on a first initialization signal.

14 . The method of claim 13 , wherein the initializing of the capacitor includes changing the voltage of the first initialization signal from a first level to a second level so as to turn on the initialization transistor.

15 . The method of claim 14 , wherein the providing of the driving current to the repair line includes providing the driving current to the repair line via the first dummy pixel driving circuit before the initialization transistor is turned on.

16 . The method of claim 15 , wherein the display device further includes a third dummy pixel electrically connected to the repair line and including a third dummy pixel driving circuit, wherein the method further comprises applying a driving current corresponding to a second data voltage to the repair line based on a third light emission control signal, and wherein the second data voltage includes a black gray data voltage.

17 . A display device, comprising:
a display panel including a display area and a non-display area surrounding the display area; a plurality of display pixels formed in the display area and each including an organic light-emitting diode; a plurality of dummy pixels formed in the non-display area and including a first dummy pixel and a second dummy pixel; and a repair modulation circuit electrically connected to the first and second dummy pixels and a selected display pixel, wherein the first dummy pixel includes a first dummy pixel driving circuit configured to provide a driving current corresponding to a data voltage of the selected display pixel to the repair line, when the selected display pixel becomes defective, based on a first light emission control signal, wherein the repair modulation circuit includes an initialization capacitor configured to be initialized before the driving current is provided from the first dummy pixel driving circuit, wherein the initialization capacitor of the repair modulation circuit is configured to be charged with the driving current when the driving current is provided from the first dummy pixel driving circuit, and wherein the initialization capacitor is further configured to share the charged current with a parasitic capacitance of the repair line when the selected display pixel is defective.

18 . The display device of claim 17 , wherein the parasitic capac

Assignees

• Samsung Display Co Ltd

Inventors

• Kang Seong Yeun
• Park Kyong Tae

Classifications

• G09G2310/0262

  The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes · CPC title

• G09G2330/08

  Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared · CPC title

• G09G2310/0289

  Details of voltage level shifters arranged for use in a driving circuit · CPC title

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G2330/10

  Dealing with defective pixels · CPC title