Patent ID: 8736573

Claim:
An apparatus compensating noise in a touch screen system, the apparatus comprising: a touch screen panel including sense channels providing a sense output corresponding to a capacitance variation associated with a touch input applied to a group of affected sense channels among the sense channels, wherein a parasitic capacitance is accumulated as the touch input is applied to the group of affected sense channels, and the sense channels further include unaffected sense channels to which the touch input is not applied; and a touch controller receiving the sense output and comprising: a noise compensation block that receives a compensating input from a channel multiplexer connecting unaffected channels, and is configured to generate a compensation capacitance to compensate for the parasitic capacitance in response to the compensating input to provide a compensation output; and a signal conversion unit that receives the compensation output from the noise compensation block and directly receives a portion of the sense output from one of the group of affected sense channels while the compensating input is received by the noise compensation block, and is configured to generate a noise compensated sense output in response to the portion of the sense output and the compensation output.