Organic light emitting display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-9275583-B2
Application number	US-201213629120-A
Country	US
Kind code	B2
Filing date	Sep 27, 2012
Priority date	Oct 4, 2011
Publication date	Mar 1, 2016
Grant date	Mar 1, 2016

Abstract

Disclosed is an organic light emitting display device including: plurality of data lines; a charging line formed in a direction crossing the plurality of data lines; and charging switches connected between the charging line and the data lines. The charging line inputs a charging voltage and the charging switches are individually controlled in data line.

First claim

The invention claimed is:

1. An organic light emitting display device comprising:
a charging controller configured to control a pre-charging or a charge-sharing operation, the charging controller compares a data signal with a reference data and generates a charging operation control signal in accordance with the determined resultant;
a logic comparator in a source driver configured to compare the charging operation control signal and a charging signal applied from a timing controller which has a high pulse according to a changed period, generating a logic signal in accordance with the determined resultant;
a plurality of data lines;
a charging line arranged in a direction crossing the plurality of data lines, connected to a charging voltage supplier which supplies a charging voltage to a charging capacitor, and the charging voltage is supplied to each of the plurality of data lines; and
a plurality of charging switches connected between the charging line and the data lines, each of the charging switches controls the charging voltage supplied to the respective data lines, the charging switches being directly connected to the logic comparator and controlled by the logic signal from the logic comparator.

2. The organic light emitting display device of claim 1 , wherein the charging controller performs a polarity comparison on the basis of the reference data opposite to the charging voltage and determines whether or not to charge the charging voltage.

3. An organic light emitting display device of claim 1 , wherein the charging controller includes:
a comparator configured to compare the data signal with the reference voltage and detect a polarity of the data signal;
a storage portion configured to temporarily store the polarity of the data signal from the comparator; and
a determiner configured to compare the polarity of a current data signal from the comparator with the polarity of a previous data signal from the storage portion, and to determine whether or not to perform the pre-charging and the charge-sharing.

4. An organic light emitting display device of claim 3 , wherein the comparator compares at least four high bits for the data signal and the reference data.

5. An organic light emitting display device of claim 2 , wherein the charging controller additionally uses at least one reference data that is additional provided and distinguishes at least three polarities.

6. An organic light emitting display device of claim 2 , wherein the reference data includes first through fourth reference data for red, green, blue and white data signals wherein the first through fourth reference data are set to be different gray levels.

7. An organic light emitting display device of claim 2 , wherein the reference data includes different reference data less than n when a pixel is configured with n sub-pixels.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Seung Tae

Classifications

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title

• G09G2310/0248

  Precharge or discharge of column electrodes before or after applying exact column voltages · CPC title

• G09G2300/04

  Structural and physical details of display devices · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title