MEMORY DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PURPOSE:To improve yield and to improve the uniformity of the luminance on the right and left of a screen by forming the address lines which are the gate electrode of a TFT array into a light guide structure. CONSTITUTION:An electric signal is transmitted from a 1st electrode 11 to the 2nd electrode 5 in the period when light is introduced into a light guide 1 to lower the resistance of a photoconductive layer 4. The photoconductive layer 4 is held in the dark to store the electric signal during the memory period. The light is introduced into the light guide 1 to lower the resistance of the photoconductive layer 4 and and the stored electric signal is read out through the 1st electrode 11 at the time of reading out the electric signal. Short-circuiting between the X and Y electrodes is, therefore, eliminated and the signal transmission lines can be disposed where there are no steps. The yield is improved in this way and the ununiformity on the right and left of the screen is eliminated in case of using the TFT array to the large-sized liquid crystal display device.