Organic light emitting display device and driving method for the same
First Claim
1. 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.
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Accused Products
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.
4 Citations
8 Claims
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1. An organic light emitting display device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for driving an organic light emitting display device that adjusts a luminance according to an ambient light, the method comprising:
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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. - View Dependent Claims (8)
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Specification