| 摘要 |
The invention is directed to a display device that can display a grayscale image by a digital drive method, without a frame memory and heat generation of the display device caused by a drive current. Without dividing one field period into a scan period and a light emission period as in an organic EL display device using a conventional digital drive method, image data from a data line are written in pixels in each of lines, and ramp voltages generated for each of the lines and image data voltages are compared with each other, and light emission display is performed based on the comparison result. This can provide a display device that can display a grayscale image by a digital drive method without the frame memory. Furthermore, an electric current to be supplied to the organic EL elements is reduced, so that the heat generation of the display device can be prevented to enhance reliability.
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