Organic light emitting display device

Patent metadata

Field	Value
Publication number	US-2016104431-A1
Application number	US-201514733790-A
Country	US
Kind code	A1
Filing date	Jun 8, 2015
Priority date	Oct 10, 2014
Publication date	Apr 14, 2016
Grant date	—

Abstract

An organic light emitting display device including data lines, an auxiliary data line, and a compensation data line, a display area including display pixels connected to the data lines, a nondisplay area including auxiliary pixels connected to the auxiliary data line, and compensation pixels connected to the compensation data line, and auxiliary lines connected to the auxiliary pixels and the compensation pixels.

First claim

What is claimed is:

1 . An organic light emitting display device comprising:
data lines, an auxiliary data line, and a compensation data line; a display area comprising display pixels connected to the data lines; a nondisplay area comprising auxiliary pixels connected to the auxiliary data line, and compensation pixels connected to the compensation data line; and auxiliary lines connected to the auxiliary pixels and the compensation pixels.

2 . The organic light emitting display device according to claim 1 , further comprising:
scan lines and light emitting control lines that cross the data lines, the auxiliary data line, and the compensation data line; a data driver configured to supply data voltages to the data lines, to supply auxiliary data voltages to the auxiliary data line, and to supply compensation data voltages to the compensation data line; and a scan driver configured to supply scan signals to the scan lines, and to supply light emitting control signals to the light emitting control lines.

3 . The organic light emitting display device according to claim 2 ,
wherein an auxiliary pixel and a compensation pixel adjacent to each other in a scan line direction are connected to a same scan line and light emitting control line.

4 . The organic light emitting display device according to claim 3 ,
wherein the data driver is configured to synchronize an auxiliary data voltage and a compensation data voltage supplied to the auxiliary pixel and the compensation pixel adjacent to each other, and to supply the synchronized auxiliary data voltage and the compensation data voltage.

5 . The organic light emitting display device according to claim 2 ,
wherein the auxiliary pixels and the compensation pixels are arranged alternately by turns in a data line direction.

6 . The organic light emitting display device according to claim 5 ,
wherein the auxiliary pixels are connected to even scan lines, and the compensation pixels are connected to odd scan lines.

7 . The organic light emitting display device according to claim 6 ,
wherein the data driver is configured to supply a compensation data voltage to the compensation pixel connected to a kth scan line (k being a positive integer) in synchronization with data voltages supplied to the display pixels connected to the kth scan line, and to supply an auxiliary data voltage to the auxiliary pixel connected to the (k+1)th scan line in synchronization with data voltages supplied to the display pixels connected to the (k+1)th scan line.

8 . The organic light emitting display device according to claim 5 ,
wherein the auxiliary pixels are connected to odd scan lines, and the compensation pixels are connected to even scan lines.

9 . The organic light emitting display device according to claim 8 ,
wherein the data driver is configured to supply an auxiliary data voltage to the auxiliary pixel connected to a kth scan line (k being a positive integer) in synchronization with data voltages supplied to the display pixels connected to the kth scan line, and to supply a compensation data voltage to the compensation pixel connected to the (k+1)th scan line in synchronization with data voltages supplied to the display pixels connected to the (k+1)th scan line.

10 . The organic light emitting display device according to claim 1 ,
wherein the data driver comprises:
an auxiliary data computing unit configured to compute digital video data being supplied to a repaired pixel of the display pixels as auxiliary data;
a memory configured to store the auxiliary data, and to update the auxiliary data to initialized data at every period; and
an auxiliary data voltage converter configured to receive the auxiliary data or initialized data from the memory, to convert the auxiliary data or initialized data into an auxiliary data voltage, and to supply the converted auxiliary data voltage to the auxiliary data line.

11 . The organic light emitting display device according to claim 1 ,
wherein the data driver comprises:
a gray value computing unit configured to compute red gray values supplied to red pixels, green gray values supplied to green pixels, and blue gray values supplied to blue pixels, the red pixels, the green pixels, and the blue pixels connected to a same scan line as a repaired pixel of the display pixels;
a coupling voltage computing unit configured to compute a coupling voltage corresponding to a voltage at which the auxiliary line is affected by the red pixels, green pixels, and blue pixels connected to a same scan line as the repaired pixel using the red gray values, green gray values, and blue gray values;
a compensation voltage computing unit configured to compute a compensation voltage as a difference between a maximum coupling voltage and the coupling voltage; and
a compensation data computing unit configured to compute compensation data according to the compensation voltage.

12 . The organic light emitting display device according to claim 11 ,
wherein the data driver further comprises a compensation data voltage converter configured to convert the compensation data into a compensation data voltage and to supply the converted compensation data voltage to the compensation data line.

13 . The organic light emitting display device according to claim 11 ,
wherein the coupling voltage computing unit is further configured to compute red coupling voltages corresponding to voltages at which the auxiliary lines are affected by the red pixels using the red gray values, to compute green coupling voltages corresponding to voltages at which the auxiliary lines are affected by the green pixels using the green gray values, to compute blue coupling voltages corresponding to voltages affected by the auxiliary lines by the blue pixels using the blue gray values, and to add up the red coupling voltages, the green coupling voltages, and the blue coupling voltages to compute the coupling voltage.

Assignees

• Samsung Display Co Ltd

Inventors

• Park Kyong-Tae
• Kim Tae-Gon
• So Dong-Yoon
• Cho Sung-Ho

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

• G09G2320/0233

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

• G09G2320/0223

  Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes · 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