| 摘要 |
A touch screen sensing device includes a touch screen including touch sensors formed at crossings of Tx lines and Rx lines, a Tx driving circuit supplying a driving pulse to each of the Tx lines N times, and an Rx driving circuit which samples a signal voltage of the touch sensors received through the Rx lines and converts the sampled signal voltage into digital data. The Rx driving circuit includes a differential amplifier differentially amplifying signals received through the Rx lines, a low pass filter removing a radio frequency noise from an output of the differential amplifier, an amplifier amplifying an output of the low pass filter, and an integrator accumulating signal voltages which are successively output from the amplifier. |
| 主权项 |
1. A touch screen sensing device comprising:
a touch screen including Tx lines, Rx lines crossing the Tx lines, and touch sensors formed at crossings of the Tx lines and the Rx lines; a touch screen panel (TSP) timing controller configured to generate a Tx setup signal for setting a Tx channel, a Rx setup signal for setting a Rx channel, and timing control signals for controlling operation timings; a Tx driving circuit configured to select a Tx channel connected to each of the Tx lines in response to the Tx setup signal and supply a driving pulse to each of the Tx lines N times, where N is a positive integer equal to or greater than 2; and an Rx driving circuit configured to select a Rx channel connected to each of the Rx lines in response to the Rx setup signal, receive a signal voltage from the Rx line, sample the signal voltage of the touch sensors received through the Rx lines and convert the sampled signal voltage into digital data, wherein the Rx driving circuit includes:
a plurality of differential amplifiers, each directly connected to two of the Rx lines which are adjacent to each other to differentially amplify signals received through the two of the Rx lines and output a positive signal and a negative signal having a potential difference corresponding to a difference between the signal voltages from the two of Rx lines
wherein each differentially amplified signal is processed through:a low pass filter configured to remove a radio frequency noise from the positive signal and the negative signal output of the differential amplifiers;an amplifier configured to amplify the positive signal and the negative signal from the low pass filter; andan integrator configured to accumulate the positive signal and the negative signal which are successively output from the amplifier. |
