Patent ID: 9128556
Filing Date: 2015-09-08
Classification: G02F,G06F

Abstract:
1. A display device having a built-in touch input unit, the display device comprising: a lower substrate in which a pixel portion having pixels and pixel electrodes is arranged; an upper substrate that is arranged at a distance from the lower substrate; a plurality of first signal lines and second signal lines that are arranged on the upper surface or lower surface of the upper substrate and through which a position detection signal is transmitted and received; a plurality of touch cells disposed on the upper surface or the lower surface of the upper substrate, wherein the plurality of touch cells are formed by dividing an active area into a plurality of areas where a touch is achieved into the plurality of areas, each of the plurality of touch cells comprising a conductive pad and a 3-terminal type switching element, wherein the conductive pad forms an electrostatic capacity between a touch input means including a bodily finger or other tools having an electrical property similar to the bodily finger and the conductive pad when the touch input means and the conductive pad are within a predetermined distance (d) in each divided area, and the 3-terminal type switching element having a gate electrode is connected to the respective conductive pad and has respectively different output signals according to an electric potential of the conductive pad; and a touch position detector that transmits and receives position detection signals to and from the first signal lines and the second signal lines, and detects whether the output signals of the switching element are changed by capacitance that is formed between the touch input means and the conductive pad, to thereby acquire a coordinate signal of the touch cell on which the touch input has occurred.