Display device

Patent metadata

Field	Value
Publication number	US-2016140897-A1
Application number	US-201514702629-A
Country	US
Kind code	A1
Filing date	May 1, 2015
Priority date	Nov 18, 2014
Publication date	May 19, 2016
Grant date	—

Abstract

A display device. A display including a display panel configured to include a plurality of active pixels and a plurality of dummy pixels, which are formed near the active pixels, a control driver configured to control a pixel driving circuit formed in each of the active pixels and a dummy driving circuit formed in each of the dummy pixels, wherein each of the pixel driving circuits of the active pixels includes a pixel driving transistor and each of the dummy driving circuits of the dummy pixels, which are formed at either end of the display panel in a first direction, is electrically connected at a first dummy node thereof and includes a dummy driving transistor and a first dummy capacitor, which connects a control terminal of the dummy driving transistor and the first dummy node.

First claim

What is claimed is:

1 . A display device, comprising:
a display panel comprising a plurality of active pixels and a plurality of dummy pixels located at one or both ends of the display panel in a first direction; wherein each of the active pixels comprises an organic light-emitting diode and a pixel driving circuit configured to the organic light-emitting diode, wherein each of the dummy pixels comprises a dummy driving circuit, wherein each of the active pixels comprises a pixel driving circuit, wherein the pixel driving circuit comprises a pixel driving transistor, and wherein the dummy driving circuit comprises a dummy driving transistor and a first dummy capacitor for coupling a control terminal of the dummy driving transistor and a first dummy node which is connected to the organic light-emitting diode.

2 . The display device of claim 1 , further comprising:
a repair line configured to extend in the first direction, wherein the repair line overlaps the active pixels aligned in the first direction.

3 . The display device of claim 2 , wherein the repair line is electrically connected to the pixel driving circuits of some of the active pixels at first pixel nodes thereof.

4 . The display device of claim 3 , further comprising:
a control driver configured to control the pixel driving circuit and the dummy driving circuit in each of the dummy pixels, wherein the control driver comprises a comparator configured to determine whether or not each of the pixel driving circuits of the active pixels is defective and a synchronizer configured to synchronize an output signal of each of the dummy driving circuits of the dummy pixels with a data signal provided to each of the pixel driving circuits of the active pixels.

5 . The display device of claim 4 , wherein the comparator is configured to control a connection between the repair line and the first pixel node.

6 . The display device of claim 1 , wherein each of the dummy driving circuits of the dummy pixels comprises a first dummy transistor and a second dummy transistor, which connect a terminal to which an initialization voltage is applied and the first dummy node, and a pumping capacitor, to which the first and second dummy transistors are connected, a control terminal of the first dummy transistor is connected to a first input signal terminal, a source terminal of the first dummy transistor is connected to the dummy node, a drain terminal of the first dummy transistor is connected to a source terminal of the second dummy transistor, a control terminal of the second dummy transistor is connected to a second input signal terminal, the source terminal of the second dummy transistor is connected to the drain terminal of the first dummy transistor, and a drain terminal of the second dummy transistor is connected to a second power supply voltage terminal.

7 . The display device of claim 6 , wherein each of the pixel driving circuits of the active pixels comprises a first pixel transistor and a second pixel transistor, a control terminal of the first pixel transistor is connected to the second input signal terminal, and a control terminal of the second pixel transistor is connected to a third input signal terminal.

8 . The display device of claim 6 , wherein each of the pixel driving circuits of the active pixels comprises a first pixel transistor and a second pixel transistor, a control terminal of the first pixel transistor and a control terminal of the second pixel transistor are electrically connected together, and the control terminal of the first pixel transistor is connected to the second input signal terminal.

9 . A display device, comprising:
a display panel comprising a plurality of active pixels and a plurality of dummy pixels located at one or both ends of the display panel in a first direction; wherein each of the active pixels comprises an organic light-emitting diode and a pixel driving circuit configured to the organic light-emitting diode, wherein each of the dummy pixels comprises a dummy driving circuit, wherein each of the active pixels comprises a pixel driving circuit, wherein the pixel driving circuit comprises a pixel driving transistor and wherein the dummy driving circuit comprises a dummy driving transistor, a first dummy capacitor for coupling a control terminal of the dummy driving transistor and a first dummy node, which is connected to the organic light-emitting diode, a boost diode, and a first transistor, which is configured to apply a voltage at an anode terminal of the boost diode to a third dummy node.

10 . The display device of claim 9 , further comprising:
a repair line configured to extend in the first direction, wherein the repair line overlaps the active pixels aligned in the first direction.

11 . The display device of claim 10 , wherein the pixel driving circuits of some of the active pixels are electrically connected at first pixel nodes thereof.

12 . The display device of claim 11 , further comprising:
a control driver configured to control the pixel driving circuit and the dummy driving circuit in each of the dummy pixels, wherein the control driver comprises a comparator, configured to determine whether each of the pixel driving circuits of the active pixels is defective and a synchronizer, configured to synchronize an output signal of each of the dummy driving circuits of the dummy pixels with a data signal provided to each of the pixel driving circuits of the active pixels.

13 . The display device of claim 12 , wherein the comparator is configured to control a connection between the repair line and a first pixel node.

14 . The display device of claim 9 , wherein each of the pixel driving circuits of the active pixels comprises a first pixel transistor and a second pixel transistor, a control terminal of the first pixel transistor is connected to a second input signal terminal, and a control terminal of the second pixel transistor is connected to a third input signal terminal.

15 . The display device of claim 9 , wherein each of the pixel driving circuits of the active pixels comprises a first pixel transistor and a second pixel transistor, a control terminal of the first pixel transistor and a control terminal of the second pixel transistor are electrically connected together, and the control terminal of the first pixel transistor is connected to a second input signal terminal.

16 . The display device of claim 9 , wherein each of the dummy pixels is connected to an initialization line, which extends in a second direction, and the initialization line is connected to each of the boost diodes of the dummy driving circuits such that an initialization voltage is applied to the initialization line in response to an initialization signal.

17 . The display device of claim 9 , further comprising:
a boost capacitor configured to connect a first input terminal and the control terminal of a first dummy transistor.

18 . A display device, comprising:
a display panel comprising a plurality of active pixels and a plurality of dummy pixels located at one or both ends of the display panel in a first direction; wherein each of the active pixels comprises an organic light-emitting diode and a pixel driving circuit configured to the organic light-emitting diode, wherein each of the dummy pixels comprises a dummy driving circuit, wherein each of the active pixels comprises a pixel driving circuit, wherein the pixel driving circuit comprises a pixel driving transistor and wherein the dummy driving circuit comprises a dummy driv

Assignees

• Samsung Display Co Ltd

Inventors

• Park Kyong Tae
• Cho Yu Hyun

Classifications

• G09G2330/10

  Dealing with defective pixels · CPC title

• G09G2330/08

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

• G09G2320/0238

  Improving the black level · CPC title

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title

• G09G2300/0413

  Details of dummy pixels or dummy lines in flat panels · CPC title