Jadard Technology Inc.

Feng-Wei Lin

Yu-Chieh Hsu

Long Chen

Hong-Yun Wei

A circuit to cancel the effect of parasitic capacitances ('initial signals') in calculations as to precise touch locations on a touch display screen (signal compensation circuit) includes first and second compensation circuits connected to a charge-discharge node. The first compensation circuit receives initial signals, generates first charging currents to charge, and first discharging currents to discharge, the charging-discharging node. The second compensation circuit generates second charging currents to charge, and second discharging currents to discharge, the charging-discharging node. Values of the first charging currents, the second charging currents, the first discharging currents, and the second discharging currents are of different magnitudes and are applied in order to amount to a more precise match for the exact compensation value required. The charging-discharging node outputs target signals according to the initial signals as compensated by the compensation values to achieve uniformity of initial signals across the entire touch display screen.

Signal compensation circuit for compensating unwanted electrical activity on touch sensors, touch control circuit, and display device

A sample holding circuit includes a signal input terminal, a first sampling unit, a second sampling unit, and a holding unit. The signal input terminal receives a first reference voltage or a second reference voltage, the first sampling unit samples the first reference voltage when a first clock signal is triggered to obtain a first sampling voltage, the second sampling unit samples the second reference voltage when a second clock signal is triggered to obtain a second sampling voltage. The holding unit receives the first sampling voltage and the second sampling voltage when a third clock signal is triggered. The sample holding circuit effectively simplifies circuit structure and reduces the use of amplifiers, also improving the signal to noise ratio.

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Tainan, Taiwan

Feng-Wei Lin