Display device that generates a pixel signal based on a predetermined gradation value
According to an aspect, a display device includes pixels, scanning lines, signal lines, a first circuit to supply a gate signal to each scanning line, a second circuit to supply a pixel signal to each signal lines, and a third circuit to generate the pixel signal. Each pixel is reset by a predetermined gradation value before the pixel signal is supplied. The third circuit is configured to perform overdrive on some or all of the pixels. A magnitude of the difference between the gradation value of the pixel signal generated by the overdrive and the predetermined gradation value is larger for the pixel signal supplied to the pixel coupled to the scanning line supplied with the gate signal at a later timing in the scanning.
1 . A display device comprising:
a plurality of pixels;
a plurality of scanning lines each of which is coupled to more than one of the pixels arrayed along a first direction;
a plurality of signal lines each of which is coupled to more than one of the pixels arrayed along a second direction intersecting the first direction;
a first circuit configured to supply a gate signal to each of the scanning lines;
a second circuit configured to supply a pixel signal to each of the signal lines; and
a third circuit configured to generate the pixel signal according to image data, wherein
each pixel is configured to be supplied with the pixel signal in response to a timing of driving a switching element driven in accordance with the gate signal,
each pixel is configured to be reset by a reset signal corresponding to a predetermined gradation value before the pixel signal is supplied,
the first circuit is configured to perform scanning in which a timing of supplying the gate signal differs between the scanning lines when the pixel signal is supplied to each pixel,
the third circuit is configured to perform overdrive on some or all of the pixels,
the overdrive is processing of
using a difference between a gradation value indicated by pixel data included in the image data and the predetermined gradation value as a reference value and
generating the pixel signal corresponding to the gradation value the difference of which from the predetermined gradation value is larger than the reference value, and
a magnitude of the difference between the gradation value of the pixel signal generated by the overdrive and the predetermined gradation value is larger for the pixel signal supplied to the pixel coupled to the scanning line supplied with the gate signal at a later timing in the scanning.
2 . The display device according to claim 1 , wherein
the third circuit is configured to store therein a lookup table that indicates a relation between the gradation value that is indicated by the pixel data and the gradation value of the pixel signal when the overdrive is performed, and
the third circuit is configured to refer to the lookup table and generate the pixel signal to be supplied to the pixel on which the overdrive is to be performed.
3 . The display device according to claim 2 , wherein
the third circuit is configured to store therein a plurality of the lookup tables, and
the lookup tables correspond to, among the scanning lines, scanning lines to which the gate signal is supplied at different timings in the scanning.
4 . The display device according to claim 3 , wherein the number of bits of the gradation value of the pixel signal in the lookup table is larger than the number of bits of the gradation value indicated by the pixel data.
5 . The display device according to claim 4 , wherein the gradation value of the pixel signal in the lookup table differs when the gradation value indicated by the pixel data differs.
6 . The display device according to claim 1 , wherein the predetermined gradation value is a gradation value at which the degree of light transmission at the pixel is lower than 10%.