| 摘要 |
PURPOSE: A touch panel is provided to enable data sensing with multi-gray scale by converting an electric signal data obtained from photosensors which detect light of R, G, and B from analog into digital with the use of an A/D converter capable of changing voltage resolution in accordance with the colors of R, G, and B. CONSTITUTION: A pixel portion(101) includes a plurality of pixels(104). The each pixel includes a display element portion(105) and a photosensor portion(106). A red color filter is provided so as to overlap with the pixels detecting red light, a green color filter is provided so as to overlap with the pixels detecting green light, and a blue color filter is provided so as to overlap with the pixels detecting blue light. The display element portion includes a TFT(Thin Film Transistor), a storage capacitor, a liquid crystal layer, a color filter, and the like. The photosensor portion includes an element such as a photodiode, which has a function of generating an electric signal when receiving light, a transistor which controls the element, and the like. A display element control circuit includes a display element signal line driver circuit(107) and a display element scan line driver circuit(108) and controls the display element portions. A photosensor control circuit(103) includes a photosensor signal line reading circuit(109) and a photosensor scan line driver circuit(110), and controls the photosensor portions. |
