Touch detection device, touch detection method and touch screen panel, using driving back phenomenon, and display device with built-in touch screen panel

A touch detection device that is installed in the 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 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 detection device that detects occurrence of a touch capacitance (Ct) by an approach of a bodily finger or a touch input instrument such as a conductor similar to the bodily finger, the touch detection device comprising:

• a touch pad 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 and to the other side of which a driving voltage for detection of a touch input is applied;
• a driving voltage generator that generates the driving voltage periodically according to a set value;
• and a touch detector that is connected to the touch pad, 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 detection device that 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, and in which a plurality of touch pad (10a,10b) are patterned on the color filter (215) of LCD, and each touch pad (10a,10b) functions as Back Ground, the touch detection device comprising:

• a driving capacitor (Cdrv) whose one side is connected to the touch pad 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 LCD;
• a driving voltage generator that generates the driving voltage in synchronization with the common voltage;
• a touch detector that is connected to the touch pad (10a,10b), 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;
• and
• a switching device that is connected to each touch pad (10a,10b) and connect each touch pad (10a,10b) to the ground voltage or the touch detector selectively,
• and the other touch pads (10b) except the touch pad (10a) that is in detecting operation are connected to the ground voltage by the switching device and function as Back Ground.