LIQUID CRYSTAL DISPLAY WITH IMAGE READING FUNCTION, IMAGE READING METHOD AND MANUFACTURING METHOD

摘要

PURPOSE: A liquid crystal display and method thereof having an image reading function is disclosed. CONSTITUTION: A n-channel TFT (L) (26) which is connected to a transparent pixel electrode (24) and a p-channel TFT (D) (27) which is connected to the cathode side of a photodiode (25) are connected to a common source line (22) and a common gate line (23). When a positive voltage (VL) or a negative voltage (VD) are applied to the gate line (23), both the TFTs can be independently controlled to be in a ON-state. A backlight (18) which is provided on the rear of an active matrix panel (13) has monochromatic light sources (18a - 18c) emitting red, blue and green lights, and images of the colors are displayed in a time-division manner. When the images are read, by using the monochromatic light sources (18a - 18c) successively, the red, blue and green component images are read for every pixel. Only the parts of a liquid crystal layer (14) corresponding to every other pixel (P1) in the vertical and horizontal directions are brought into light transmitting states, a certain amount of charge is stored only in the photodiodes (25) of the pixels (P1), and the photodiodes (25) are exposed to light. Then the image formed by the pixels (P1) is read. The similar processes for the pixels adjacent to the pixels (P1) are repeated to read the image of the original for all the pixels.