Display device, method of generating compensation data for display device, and device for generating compensation data
A method of generating compensating data for a pixel circuit differences in a display device includes displaying a test image of pixels of the display device; generating a first camera image by photographing the test image; applying a test input signal to each of the pixels and sensing corresponding test outputs, wherein the test input signal is at least one of a test current and a test voltage; generating weights for the pixels based on the test outputs; generating a second camera image by applying the weights to the first camera image; and generating compensation data for the pixels based on the second camera image.
1 . A method of compensating for pixel circuit differences in a display device, the method comprising:
displaying a test image of pixels of a display device;
generating a first camera image by photographing the test image;
applying a test input signal to each of the pixels and sensing corresponding test outputs, wherein the test input signal is at least one of a test current and a test voltage;
generating weights for the pixels based on the test outputs, wherein the test outputs comprise at least a threshold voltage of light emitting elements of the pixels;
generating a second camera image by applying the weights to the first camera image; and
generating compensation data for the pixels based on the second camera image.
2 . The method of claim 1 , wherein a size of a stain disposed in a first area of the first camera image is larger than a size of a stain disposed in a corresponding area of the second camera image, the corresponding area and the first area representing the same part of a pixel of the pixels.
3 . The method of claim 1 , wherein the generating of the second camera image comprises multiplying the weights to corresponding grayscales of the first camera image.
4 . The method of claim 1 , further comprising:
storing the compensation data in a memory of the display device.
5 . The method of claim 1 , further comprising storing the compensation data in a memory of the display device without the first camera image and the second camera image.
6 . The method of claim 1 , wherein
the compensation data includes compensation grayscales for the pixels,
wherein a size of a compensation grayscale of the compensation data is inversely proportional to a size of a grayscale of the second camera image of the pixel.
7 . The method of claim 1 , wherein
each of the pixels includes a first sub-pixel of a first color, a second sub-pixel of a second color, and a third sub-pixel of a third color, and
the generating the first camera image, the generating the second camera image, and the generating the compensation data are independently performed for each of the first sub-pixel, the second sub-pixel, and the third sub-pixel.
8 . The method of claim 1 , wherein
each of the pixels includes a first sub-pixel of a first color, a second sub-pixel of a second color, and a third sub-pixel of a third color, and
the generating the first camera image, the generating the second camera image, and the generating the compensation data are performed for the first sub-pixel, the second sub-pixel, and the third sub-pixel in a coordinated order.
9 . The method of claim 1 wherein the test outputs further comprise at least one of a threshold voltage of driving transistors of the pixels or a mobility of the pixels.
10 . A device for generating compensation data for pixels, the device comprising:
a camera that generates a first camera image by photographing test images displayed by pixels of a display device; and
a test controller that inputs a test input signal to each of the pixels and senses corresponding test outputs, the test input signal being a test current or a test voltage, wherein
the test controller generates weights for the pixels based on the test outputs, wherein the test outputs comprise at least a threshold voltage of light emitting elements of the pixels, generates a second camera image by applying the weights to the first camera image, and generates compensation data for the pixels using the second camera image.
11 . The device of claim 10 , wherein a size of a stain disposed in a first area of the first camera image is larger than a size of a stain disposed in a corresponding area of the second camera image, the corresponding area and the first area representing the same part of a pixel of the pixels.
12 . The device of claim 10 , wherein the second camera image is generated by multiplying the weights to corresponding grayscales of the first camera image.
13 . The device of claim 10 , wherein the compensation data is stored in a memory of the display device.
14 . The device of claim 13 , wherein the compensation data is stored in the memory without the first camera image and the second camera image.
15 . The device of claim 10 , wherein
the compensation data includes compensation grayscales for the pixels, and
a size of a compensation grayscale of the compensation data is inversely proportional to a size of a grayscale of the second camera image of the pixel.
16 . The device of claim 10 wherein the test outputs further comprise at least one of a threshold voltage of driving transistors of the pixels or a mobility of the pixels.
17 . A display device comprising:
a plurality of pixels;
a sensing unit that senses corresponding test outputs from the pixels to which a test input signal is applied, the test input signal being at least one of a test current and a test voltage; wherein the test outputs comprise at least a threshold voltage of light emitting elements of the pixels,
a memory that provides first compensation data that is optical compensation data; and
a compensation data correction unit that generates second compensation data by applying weights based on the test outputs to the first compensation data.
18 . The display device of claim 17 , wherein the first compensation data is maintained without change, and when the test outputs are updated, the second compensation data is updated.
19 . The display device of claim 17 , further comprising:
a timing controller that generates output grayscales by applying the second compensation data to input grayscales for the pixels.
20 . The display device of claim 19 , further comprising:
a data driver that generates data voltages corresponding to the output grayscales and supplies the data voltages to the pixels.