Display device
A display device includes a pixel unit that includes a plurality of pixels, a compensator configured to receive sensing data from the pixel unit in a sensing period and that detects and compensates for a characteristic of the pixels, and a timing controller configured to convert an image signal received from an outside into image data.
1 . A display device comprising:
a pixel unit that includes a plurality of pixels;
a compensator configured to receive sensing data from the pixel unit in a sensing period and that detects and compensates for a characteristic of the pixels; and
a timing controller configured to convert an image signal received external to the display device into image data,
wherein a frame comprises:
an active period in which the image data is supplied; and
a blank period of which a length is changed according to a frame frequency change, and; and wherein the active period and the blank period together include, in sequential order:
a normal data write sub-period in the active period,
a sensing sub-period following the normal data write sub-period,
a first data re-write sub-period in the blank period following the sensing sub-period, and
a second data re-write sub-period in the blank period following the first data re-write sub-period,
and the timing controller is configured to:
output compensation image data for compensating for a luminance decrease due to the sensing sub-period in the normal data write sub-period;
output the compensation image data in the first data re-write sub-period, and to;
output the image data in the second data re-write sub-period;
adjust the compensation image data based on a luminance compensation gain determined according to a grayscale and/or a color of the image data; and
vary a size of the compensation image data in response to a position of the pixels and changes in the frame frequency.
2 . The display device according to claim 1 , wherein a start time point of the second data re-write sub-period coincides with a time when a length of a blank period corresponding to a maximum frame frequency elapses from a start time point of the sensing period.
3 . The display device according to claim 1 , wherein when external compensation is required, the timing controller is configured to:
change the image data to external compensation image data based on the data sensed in the sensing sub-period;
output the external compensation image data instead of the image data in the normal data write sub-period and the second data re-write sub-period; and
adjust the external compensation image data based on grayscale, color, and frame frequency changes to ensure consistent luminance correction.
4 . The display device according to claim 3 , further comprising:
a data driver configured to convert the image data, the external compensation image data, and the compensation image data received from the timing controller into a data voltage, an external compensation data voltage, and a compensation data voltage, respectively, and supply the data voltage, the external compensation data voltage, and the compensation data voltage to the pixel unit wherein the data driver is configured to process dynamically adjusted compensation image data based on grayscale, color, pixel position, and frame frequency changes.
5 . The display device according to claim 4 , wherein a total luminance amount increased by the compensation data voltage is substantially the same as a luminance amount decreased during the first data re-write sub-period and the second data re-write sub-period.
6 . The display device according to claim 4 , wherein the timing controller is configured to vary a size of the compensation image data output in the first data re-write sub-period in response to a position of the pixels.
7 . The display device according to claim 6 , wherein the timing controller is configured to increase the size of the compensation image data as the position of the pixels is closer to a lower end of the pixel unit.
8 . The display device according to claim 7 , wherein a luminance amount increased by the compensation data voltage output in the first data re-write sub-period is substantially the same as a luminance amount decreased during the first data re-write sub-period and the second data re-write sub-period.
9 . The display device according to claim 3 , wherein the timing controller is configured to determine a size of the compensation image data based on a grayscale and/or a color of the image data or the external compensation image data.