Circuit and method for measuring capacitance value of touch screen

PURPOSE: A capacitance measurement circuit of a touch screen and method thereof are provided to improve a resolution function by acquiring the change rate of time according to the change rate of a capacitance capacity. CONSTITUTION: A target capacitor unit(310) includes a target capacitor which recharges a target charging voltage. The target recharge voltage is increased from a ground voltage. A reference capacitor unit(330) includes a reference capacitor is which is recharged by a reference charging voltage. The target recharge voltage outputs a succession signal by enabling a comparing unit(350) to compare the target recharge voltage with the recharge reference voltage. A control unit(360) creates digital output signal and a control signal by receiving the signal of the comparing unit.