Organic light emitting display device and driving method for the same
AssigneeSamsung Mobile Display Co., Ltd.
InventorEun Jung Oh
Life of this patent
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Abstract
An organic light emitting display device and a driving method for the same is provided. The device includes a pixel portion adapted to receive a scan signal and a data signal and display an image. A scan driver generates and applies the scan signal to the pixel portion. A data driver generates and applies the data signal and a pixel voltage to the pixel portion. When the device is operating in the normal mode, the data driver also applies a drive voltage to a photo sensor also included in the display device. The photo sensor adjusts a luminance of the pixel portion according to a sensed brightness of ambient light. When the device is operating in the power saving or stand-by mode, the data driver controls the drive voltage off and thereby prevents power consumption by the photo sensor.
Claims8
An organic light emitting display device, comprising:
- a data driver adapted to:
- receive an external voltage;
- control a drive voltage to be on or off, wherein the drive voltage is controlled to be on when the organic light emitting display device is operating in a normal mode and the drive voltage is controlled to be off when the organic light emitting display device is not operating in the normal mode;
- and
- generate and output a data signal;
- a photo sensor adapted to:
- sense a brightness of an ambient light to determine a sensed brightness of the ambient light;
- receive the drive voltage controlled by the data driver;
- and
- output a brightness signal based on the sensed brightness of the ambient light, the brightness signal being received by the data driver;
- a scan driver adapted to generate and transfer a scan signal;
- and
- a pixel portion adapted to:
- receive the data signal and the scan signal;
- and
- display an image having a luminance indicative of the brightness signal, wherein the photo sensor comprises:
- an optical sensing section adapted to output an analog sensing signal corresponding to the sensed brightness of the ambient light;
- an analog-to-digital converter adapted to convert the analog sensing signal from the optical sensing section into a digital sensing signal;
- a counter adapted to count a predetermined number during one frame period and generate a corresponding counting signal;
- a conversion processor adapted to output a control signal based on the digital sensing signal and the counting signal;
- a register generator adapted to divide the sensed brightness of the ambient light into a plurality of stages of brightness, and store a plurality of register set values corresponding to the plurality of stages of brightness;
- a first selector adapted to select and output one of the plurality of register set values according to the control signal output from the conversion processor;
- and
- a gamma compensation circuit adapted to generate a gamma compensation signal according to the control signal output from the conversion processor.
A method for driving an organic light emitting display device that adjusts a luminance according to an ambient light, the method comprising:
- controlling a drive voltage of a photo sensor to be on when the organic light emitting display device operates in a normal mode;
- applying the drive voltage to a photo sensor for outputting a signal corresponding to an ambient light;
- adjusting a luminance according to the signal corresponding to the ambient light;
- and
- controlling the drive voltage of the photo sensor to be off when the organic light emitting display device operates in a power saving mode or in a stand-by mode,
- wherein the photo sensor comprises:
- an optical sensing section adapted to output an analog sensing signal corresponding to a sensed brightness of the ambient light;
- an analog-to-digital converter adapted to convert the analog sensing signal from the optical sensing section into a digital sensing signal;
- a counter adapted to count a predetermined number during one frame period and generate a corresponding counting signal;
- a conversion processor adapted to output a control signal based on the digital sensing signal and the counting signal;
- a register generator adapted to divide the sensed brightness of the ambient light into a plurality of stages of brightness, and store a plurality of register set values corresponding to the plurality of stages of brightness;
- a first selector adapted to select and output one of the plurality of register set values according to the control signal output from the conversion processor;
- and
- a gamma compensation circuit adapted to generate a gamma compensation signal according to the control signal output from the conversion processor.
Dependencies are inferred from the claim text.