Apparatus and method for driving organic light emitting display device

• US 9,240,142 B2
• Filed: 12/13/2012
• Issued: 01/19/2016
• Est. Priority Date: 10/15/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Oh, Jinyoung, Jeong, JaeHyeong, Lee, HyunKi
• Primary Examiner(s): Wang-Hurst, Kathy
• Assistant Examiner(s): Shen, Peijie
• Application Number:
  US13/713,705
• Publication Number:
  US 20140104259A1
• Time in Patent Office: 1,132 Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2330/025 Reduction of instantaneous peaks of current
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3275 Details of drivers for data electrodes

Abstract

Disclosed is an apparatus and method for driving an organic light emitting display device which facilitates to control current consumption of a display panel according to a temperature of the display panel including a light emitting device or a surrounding temperature of the display panel, the apparatus comprising the display panel including the plurality of pixels provided with the plurality of light emitting devices which emit light according to a current, a temperature sensing unit for generating temperature data by sensing a temperature of the display panel or surrounding temperature; and a panel driver for controlling a data signal to be supplied to each pixel so as to make current consumption of the display panel be lower than a preset current limit value on the basis of input data and temperature data.

Claims

1. An apparatus for driving an organic light emitting display device comprising:

a display panel including a plurality of pixels provided with a plurality of light emitting devices which emit light according to a current;

a temperature sensing unit that generates temperature data by sensing a temperature of the display panel or surrounding temperature; and

a panel driver that generates a frame current value of one frame by the use of input data and temperature data, generates a current limit gain value for controlling the current consumption of the display panel be lower than the preset current limit value based on the frame current value, and controls a data signal to be supplied to each pixel based on the current limit gain value.

2. The apparatus according to claim 1, wherein the panel driver converts the input data into conversion data;

generates a plurality of reference gamma voltages that control the current consumption of the display panel to be lower than the preset current limit value on the basis of the current limit gain value; and

converts the conversion data to the data signal by the use of reference gamma voltages so as to make the light emitting device emit light.

3. The apparatus according to claim 2, wherein the panel driver comprises:

a data driver which converts the conversion data into the data signal by the use of reference gamma voltages, and supplies the data signal to each pixel;

a scanning driver which supplies a scanning signal to each pixel; and

a controller which controls each driving of the data driver and the scanning driver, generates the conversion data and the plurality of reference gamma voltages, and supplies the generated conversion data and the plurality of reference gamma voltages to the data driver,

wherein the controller converts the input data into the conversion data, generates the current limit gain value on the basis of the temperature data and conversion data, and generates the plurality of reference gamma voltages by the use of current limit gain value.

4. The apparatus according to claim 3, wherein the controller includes a temperature compensating unit which calculates an input data gain value based on the input data of one frame, and a temperature gain value based on the temperature data;

calculates the frame current value from the conversion data of one frame by the use of input data gain value and temperature gain value; and

generates the current limit gain value based on the frame current value.

5. The apparatus according to claim 4, wherein the temperature compensating unit calculates a frame current gain value by dividing the input data gain value by the temperature gain value;

and calculates the frame current value by reflecting the frame current gain value on the conversion data of one frame.

6. The apparatus according to claim 4, wherein the temperature compensating unit corrects the frame current value by reflecting the temperature gain value on the frame current value;

and generates the current limit gain value on the basis of the corrected frame current value.

7. The apparatus according to claim 1, wherein the panel driver converts the input data into conversion data;

generates correction data by correcting the conversion data so as to make the current consumption of the display panel be lower than the preset current limit value on the basis of the current limit gain value;

converts the correction data into the data signal by a plurality of reference gamma voltages; and

makes the light emitting device emit light.

8. The apparatus according to claim 7, wherein the panel driver comprises:

a data driver which converts the correction data into the data signal by the use of reference gamma voltages, and supplies the data signal to each pixel;

a scanning driver which supplies a scanning signal to each pixel; and

a controller which controls each driving of the data driver and the scanning driver, generates the correction data and the plurality of reference gamma voltages, and supplies the generated correction data and the plurality of reference gamma voltages to the data driver,

wherein the controller converts the input data into the conversion data, generates the current limit gain value on the basis of the temperature data and conversion data, and generates the correction data by correcting the conversion data by the use of current limit gain value.

9. The apparatus according to claim 8, wherein the controller includes a temperature compensating unit which calculates an input data gain value based on the input data of one frame, and a temperature gain value based on the temperature data;

calculates the frame current value from the conversion data of one frame by the use of input data gain value and temperature gain value; and

generates the current limit gain value based on the frame current value.

10. The apparatus according to claim 1, wherein the panel driver converts the input data into conversion data;

simultaneously generates a plurality of reference gamma voltages and correction data by correcting the conversion data for controlling the current consumption of the display panel to be lower than the preset current limit value on the basis of the current limit gain value;

converts the correction data to the data signal by the use of reference gamma voltages; and

makes the light emitting device emit light.

11. The apparatus according to claim 10, wherein the panel driver comprises:

a data driver which converts the correction data into the data signal by the use of reference gamma voltages, and supplies the data signal to each pixel;

a scanning driver which supplies a scanning signal to each pixel; and

a controller which controls each driving of the data driver and the scanning driver, generates the correction data and the plurality of reference gamma voltages, and supplies the generated correction data and the plurality of reference gamma voltages to the data driver,

wherein the controller converts the input data into the conversion data, generates current limit gain value on the basis of the temperature data and conversion data, and generates the plurality of reference gamma voltages and the correction data by correcting the conversion data through the use of current limit gain value.

12. The apparatus according to claim 11, wherein the controller generates a current limit gain value for gamma voltage and a current limit gain value for data by dividing the current limit gain value according to a preset proportion;

and generates the correction data by correcting the conversion data by the use of current limit gain value for data, and simultaneously generates the plurality of reference gamma voltages by the use of current limit gain value for gamma voltage.

13. A method for driving an organic light emitting display device comprising a display panel for displaying an image by making a light emitting device in each of pixels emit light by the use of current, comprising:

generating temperature data by sensing a temperature of the display panel or surrounding temperature;

generating a frame current value of one frame by the use of input data and temperature data;

generating a current limit gain value for controlling the current consumption of the display panel be lower than the preset current limit value based on the frame current value; and

controlling a data signal to be supplied to each pixel based on the current limit gain value.

14. The method according to claim 13, wherein the process for controlling the data signal to be supplied to each pixel comprises:

converting the input data into conversion data;

generating a plurality of reference gamma voltages by the use of current limit gain value; and

converting the conversion data into the data signal by the use of reference gamma voltages, and supplying the data signal to each pixel so as to make the light emitting device emit light.

15. The method according to claim 14, wherein the process for generating the current limit gain value comprises:

calculating an input data gain value based on the input data of one frame, and a temperature gain value based on the temperature data;

calculating the frame current value from the conversion data of one frame by the use of input data gain value and temperature gain value; and

generating the current limit gain value based on the frame current value.

16. The method according to claim 15, wherein the process for calculating the frame current value comprises:

calculating a frame current gain value by dividing the input data gain value through the temperature gain value; and

calculating the frame current value by reflecting the frame current gain value on the conversion data of one frame.

17. The method according to claim 15, wherein the process for generating the current limit gain value comprises correcting the frame current value by reflecting the temperature gain value on the frame current value, wherein the current limit gain value is generated according to the corrected frame current value.

18. The method according to claim 13, wherein the process for controlling the data signal to be supplied to each pixel comprises:

converting the input data into conversion data;

generating correction data by correcting the conversion data through the use of current limit gain value; and

converting the correction data into the data signal by a plurality of reference gamma voltages, and supplying the data signal to each pixel so as to make the light emitting device emit light.

19. The method according to claim 13, wherein the process for controlling the data signal to be supplied to each pixel comprises:

converting the input data into conversion data;

generating correction data by correcting the conversion data through the use of current limit gain value and simultaneously generating a plurality of reference gamma voltages by the use of current limit gain value; and

converting the correction data into the data signal by the use of reference gamma voltages, and supplying the data signal to each pixel so as to make the light emitting device emit light.

20. The method according to claim 19,

wherein the process for generating the current limit gain value further comprises generating a current limit gain value for gamma voltage and a current limit gain value for data by dividing the current limit gain value according to a preset proportion, and

wherein the process for generating the correction data by correcting the conversion data through the use of current limit gain value and simultaneously generating the plurality of reference gamma voltages by the use of current limit gain value comprises generating the correction data by correcting the conversion data through the use of current limit gain value for data, and generating the plurality of reference gamma voltages by the use of current limit gain value for gamma voltage.