Samsung Electronics Co., Ltd.

Jin Chul Lee

Yoon Kyung Choi

Jun Chul Park

Cha Dong Kim

Bum Soo Kim

Dong Wook Lim

Choong Hoon Lee

San Ho Byun

Kyeong Gon Lee

Hyun Kyu Ouh

A touch panel controller includes a signal driver charging a plurality of sensor lines extending in a direction with the same charge, by applying a driving signal to one sensor line of sensor lines and applying a mirrored driving signal mirrored from the driving signal to the remaining sensor lines of the sensor lines, and a sensor sensing a change in capacitance from the sensor lines, respectively.

Touch panel controller for sensing change in capacitance

A touch sensor controller may include a transmitter configured to output a driving signal to sensor lines of a touch panel, a charge amplifier configured to generate and output a voltage signal by using a charge generated in the sensor lines, a sampling circuit including a first sampler and a second sampler for detecting the voltage signal, and a logic circuit configured to determine whether the transmitter is operating according to a magnitude of a noise signal included in the voltage signal, and, in response to an operation of the transmitter being interrupted, control one of the first sampler and the second sampler to sample the voltage signal according to a sign of the noise signal.

Touch sensor controller

A touch screen controller for cancelling an offset capacitance of a capacitive touch screen panel includes a code generator configured to generate a time-invariant digital code and a time-variant digital code during an offset cancellation time. A switched-capacitor array converts the time-invariant digital code and the time-variant digital code into an amount of electric charges corresponding to the offset capacitance.

Circuit for cancelling offset capacitance of capacitive touch screen panel and device including the same

A touch screen controller controlling a capacitive touch screen includes a first comparator that compares a reference signal with a sensing signal, and generates a first output signal. The capacitive touch screen includes capacitive touch sensors connected to a sensing line and a drive line, and that sense a touch event. The sensing signal is output from the sensing line. The touch screen controller further includes a filter that generates a second output signal by integrating the first output signal in each sensing cycle of the filter, an analog-to-digital converter that converts the second output signal to a digital signal, and a controller that determines at least one of whether a noise is generated and whether the touch event is generated based on a reference digital signal and the digital signal, and that adjusts the number of the sensing cycles of the filter based on a result of the determination.

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Seoul, South Korea

Jin Chul Lee