TOUCH DETECTION DEVICE, TOUCH DETECTION METHOD AND TOUCH SCREEN PANEL, USING DRIVING BACK PHENOMENON, AND DISPLAY DEVICE WITH BUILT-IN TOUCH SCREEN PANEL

摘要

Provided is a touch detection device, touch detection method, and touch screen panel, which detects a touch signal by detecting a driving back phenomenon occurring in a touch pad by a driving voltage applied to a driving capacitor, and a display device with a built-in touch screen panel. The touch detection device that is added on top of a display device and detects occurrence of a touch capacitance (Ct) by an approach of a bodily finger (25) or a touch input instrument such as a conductor similar to the bodily finger, the touch detection device comprising: a touch pad (10) that forms the touch capacitance (Ct) between the touch input instrument and the touch pad; a driving capacitor (Cdrv) whose one side is connected to the touch pad (10) and to the other side of which a driving voltage for detection of a touch input is applied; a common voltage detector that detects a common voltage generated from the display device; a driving voltage generator that generates the driving voltage in synchronization with the common voltage; and a touch detector that is connected to the touch pad (10), and that detects a touch signal by using a driving back phenomenon when the touch capacitance (Ct) is added to the driving capacitor (Cdrv) according to occurrence or non-occurrence of a touch in the touch input instrument. A touch signal is detected while avoiding a point in time of a change of a common voltage state, and a driving voltage is applied through a driving capacitor connected to a touch detector, to thus detect whether or not a driving back phenomenon occurs in the touch detector and to thereby acquire a touch signal. Accordingly, an influence due to parasitic capacitance generated by noise, coupling phenomenon or other factors is minimized, to thus acquire a touch signal stably.

主权项

1. A touch detection apparatus installed in a display device to sense a generation of touch capacitance Ct by approaching a touch input device of a finger of a human body or a conductor similar to the finger to the display device, the touch detection apparatus comprising:
a touch pad configured to form the touch capacitance Ct between the touch pad and the touch input device; a driving capacitor Cdrv, wherein one portion of the driving capacitor Cdrv is connected to the touch pad and the other portion of the driving capacitor Cdrv is applied with a driving voltage for touch detection; a touch detector configured to be connected to the touch pad and detect a touch signal using a driving back phenomenon when the touch capacitance Ct is added to the driving capacitor Cdrv depending on whether the touch input device is touched; and a sensor signal line configured to transmit the touch signal of the touch pad to a touch drive IC (TDI), wherein a line width of the sensor signal line is getting wider as a distance between the touch pad and the TDI is increased.