Voltage difference-based capacitive touch detection device, capacitive touch detection method and capacitive touch screen panel, and display device with built-in capacitive touch screen panel

摘要

Provided is a new capacitive touch detection device, detection method, and touch screen panel for detecting a touch signal by detecting a voltage difference of a sensor pattern from a driving voltage applied by an auxiliary capacitor, and to a display device having a built-in capacitive touch screen. A capacitive touch detection device includes: a sensor pattern (10) forming a touch capacitance (Ct) in between a touch input device and the sensor pattern; an auxiliary capacitor (Caux) connected on one side to the sensor pattern (10) and having a driving voltage for touch detection applied to the other side thereof; a charging unit (12) for providing pre-charge signals to the touch capacitance (Ct) and the auxiliary capacitor (Caux); and a touch detection sensor (14) which is connected to the sensor pattern (10) and which detects a touch signal by detecting a voltage difference in the sensor pattern (10) when the touch capacitance (Ct) is added to the auxiliary capacitor (Caux) according to a touch of a touch input instrument. Effects of parasitic capacitance generated due to noise, coupling phenomena and other factors are minimized, to thus stably acquire touch signals.

主权项

1. A capacitive touch screen panel of a display device for detecting occurrence of a touch capacitance, the capacitive touch screen panel comprising:
a substrate; a plurality of sensor patterns formed in an interface portion, the interface portion separating pixels of the display device from each other and generating one or more touch signals when a finger or a touch input instrument approaches the plurality of sensor patterns; an auxiliary capacitor having one side that is connected to the sensor patterns and the other side to which a driving voltage for detection of a touch input is applied; a touch detection sensor that is connected to the sensor patterns, and that detects the one or more touch signals by detecting a voltage difference between a magnitude of a voltage generated in the sensor patterns by a driving voltage applied to the auxiliary capacitor when the touch capacitance is added at the time of occurrence of a touch input and a magnitude of a voltage generated by a driving voltage applied to the auxiliary capacitor in the sensor patterns at the time of non-occurrence of a touch input; and a drive integrated circuit (IC) that controls a charging unit to supply a pre-charge signal to the touch capacitance and computes touch coordinates from an output of the touch detection sensor, wherein the driving voltage that is applied to the other side of the auxiliary capacitor is an alternating voltage that alternates at a predetermined frequency.