Liquid crystal display with image reading function, image reading method and manufacturing method

Abstract

A TFT(,),with n-channel, which is connected to a transparent pixel electrode,and a TFT(,),with p-annel, which is connected to a cathode side of a photodiode,are connected to a common source line,and a common gate line,and are composed so that each of them can be controlled in an ON state independently by impressing a positive voltage V,or a negative voltage V,on the gate line,A backlight,which is provided on a backside of an active matrix panel,comprises monochromatic light sources,for emitting each monochromatic light of red, blue or green, and a picture of each color is displayed in a time division. While reading a picture, the picture of the components of red, blue and green are read at each simplex pixel by using each of the monochromatic light sources,sequentially. A picture at a pixel P,are read by storing a predetermined electric charge only at the photodiode,of the pixel P,and exposing the photodiode,as well as making a liquid crystal layer,corresponding to every two pixels P,vertically and horizontally a transmission state, and an original picture is read at all pixels by repeating similar operation at each of pixels which are adjacent to the pixel P