Abstract: A voltage regulation circuit including a differential input unit, a source follower and a driving unit is provided. The differential input unit has a first input terminal and a second input terminal for receiving a reference voltage and a system voltage respectively. Further, the differential input unit compares the reference voltage and the system voltage and accordingly generates a control voltage. The source follower is electrically connected between the differential input unit and the driving unit, and generates an adjustment voltage according to the control voltage. The differential input unit, the source follower and the driving unit form a feedback loop, so that the driving unit fixes a source voltage to the system voltage according to the adjustment voltage.

Abstract: A test system for testing a capacitive touch sensor is provided. The test system includes a resistor, a signal generator and a micro controller. A first end of the resistor is electrically connected to a sensing port of the capacitive touch sensor. The signal generator provides a test voltage to a second end of the resistor according to control information. In this way, the resistor generates a test current according to the test voltage, and the capacitive touch sensor provides a voltage difference to the sensing port according to a plurality of switching signals, and converts the test current into test information. The micro controller generates the control information according to a test table, and compares the test information according to the test table, so as to determine whether an operation of the capacitive touch sensor is normal.

Abstract: A display system includes a display device, a driving circuit, a flexible printed circuit (FPC), a charge pump circuit and a control circuit. The driving circuit is disposed on the display device, for driving the display device. The FPC is externally coupled to the display device. The charge pump circuit is disposed on the FPC, for generating at least an output voltage to the driving circuit. The control circuit is disposed on the display device and coupled to the driving circuit, for generating a plurality of control signals to control the charge pump circuit. The charge pump circuit has a plurality of control ports coupled to the control circuit for receiving the control signals generated from the control circuit, respectively.

Abstract: A sensing device for sensing a touch panel. The sensing device includes a touch sensor and a touch controller. The touch sensor senses touch events on the touch panel to generate raw data representing sensed values of the pixels on the touch panel, and further filters the raw data to generate filtered data. The data size of the filtered data is smaller than the data size of the raw data. The touch controller receives the filtered data from the touch sensor and processes the filtered data so as to determine positions of the touch events on the touch panel.

Abstract: A touch panel including a plurality of panel capacitors, a first switching unit, a second switching unit, a first charging unit, a control unit and a counter is provided. Each of the panel capacitors is sequentially selected as an object capacitor. The first switching unit and the second switching unit switch the voltages received by the two terminals of the object capacitor. The control unit controls a first charging current provided by the first charging unit according to the variation in the terminal voltages of the object capacitor, and generates a comparison signal accordingly. The counter counts the comparison signal and the touch panel identifies the variation in the capacitance value of the object capacitor by using a count value generated by the counter.

Abstract: A touch panel has a panel capacitor, a first capacitor, and a second capacitor. The panel capacitor and the first capacitor are charged and discharged cyclically according to a first phase signal and a second phase signal, such that an input voltage associated with the panel capacitor and the first capacitor is applied to a control circuit. The control circuit charges and discharges a second capacitor based on the input voltage and a reference voltage to compensate the difference between the input voltage and the reference voltage. The capacitance of the panel capacitor could be calculated based on the frequency of charging and discharging the second capacitor.

Abstract: An oscillator calibration apparatus includes a counter, a comparator and an adjusting unit. The counter is utilized for receiving a first clock signal and a second clock signal, and utilizing the first clock signal to sample the second clock signal to generate at least one counting value, where the first clock signal is generated from a first oscillator, and the second clock signal is generated from a second oscillator different from the first oscillator; the comparator is coupled to the counter, and is utilized for comparing the counting value with a predetermined value to generate at least one calibration signal; and the adjusting unit is coupled to the comparator, and is utilized for adjusting a frequency of the second oscillator according to the calibration signal.

Abstract: A switched-capacitor tracking apparatus including a variable capacitor, an auxiliary capacitor, and a plurality of switches, and an operating method thereof are provided. In a charge period, a first reference voltage charges a panel capacitor, and a second reference voltage charges the variable capacitor. In a detection period, a control circuit detects a parallel connected voltage of the panel capacitor and the variable capacitor. The control circuit compares a third reference voltage and the parallel connected voltage. According to a comparison result, the control circuit dynamically determines whether to parallel connect the auxiliary capacitor to the variable capacitor. If all the comparison results accumulated in a statistics period are a first logic value, then the control circuit increases a capacitance of the variable capacitor. Moreover, if all the comparison results are a second logic value in the statistics period, then the control circuit decreases the capacitance of the variable capacitor.

Abstract: A temperature sensor is provided. The temperature sensor includes: a temperature sensing unit for sensing a temperature and outputting a temperature sensing signal; an analog-to-digital converter (ADC), coupled to the temperature sensing unit, for converting the temperature sensing signal to a digital value, having an ADC output range; a calibration unit, coupled to the ADC, for correlating the ADC output range with at least one temperature range; a memory unit, coupled to the calibration unit, recording the ADC output range, and the at least one temperature range, and the correlation therebetween.

Abstract: A filtering system, adapted to remove a direct current (DC) component and a high frequency noise component of a touch-sensed signal is provided. The filtering system includes: an analog to digital converter for transforming the touch-sensed signal into a discrete-time input signal; a direct current removing unit for removing direct current components of the discrete-time input signal to obtain a differentiated signal; a de-noise unit for removing noise components of the differentiated signal to obtain a de-noise signal; and a reconstructive unit for processing the de-noise signal to obtain an output signal.

Abstract: A current sensing circuit including a current sensing unit, a feedback control unit, and a digital output unit is provided. The current sensing unit senses a current and generates a pulse signal according to at least one reference signal and at least one feedback signal. The feedback control unit is coupled to the current sensing unit and generates the at least one feedback signal according to a clock signal and the pulse signal. The digital output unit is coupled to the current sensing unit and outputs a digital signal according to the pulse signal. The digital output unit counts an amount of pulses of the pulse signal in a predetermined time period to output the digital signal, wherein the amount of pulses is positively correlated with a value of the current.

Abstract: A sensing device for sensing a touch panel. The sensing device includes a touch sensor and a touch controller. The touch sensor senses touch events on the touch panel to generate raw data representing sensed values of the pixels on the touch panel, and further filters the raw data to generate filtered data. The data size of the filtered data is smaller than the data size of the raw data. The touch controller receives the filtered data from the touch sensor and processes the filtered data so as to determine positions of the touch events on the touch panel.

Abstract: A current sensing circuit including a current sensing unit, a feedback control unit, and a digital output unit is provided. The current sensing unit senses a current and generates a pulse signal according to at least one reference signal and at least one feedback signal. The feedback control unit is coupled to the current sensing unit and generates the at least one feedback signal according to a clock signal and the pulse signal. The digital output unit is coupled to the current sensing unit and outputs a digital signal according to the pulse signal. The digital output unit counts an amount of pulses of the pulse signal in a predetermined time period to output the digital signal, wherein the amount of pulses is positively correlated with a value of the current.

Abstract: A display system includes a display device, a driving circuit, a flexible printed circuit (FPC), and a charge pump circuit. The driving circuit is disposed on the display device for driving the display device. The FPC is externally coupled to the display device. The charge pump circuit is disposed on the FPC for generating at least an output voltage to the driving circuit according to an input voltage. The charge pump circuit has at least one control line coupled to the driving circuit for receiving a control signal generated from the driving circuit, and the charge pump circuit sets a pumping factor according to the control signal.

Abstract: A touch device and a touch position locating method thereof are provided. The touch position locating method includes the following steps. A plurality of target blocks are selected from a plurality of sensing blocks of a touch panel. The target blocks are detected at the same time to obtain a plurality of touch sensing data. Reference data is obtained according to the touch sensing data. Subtraction operations between the reference data and the touch sensing data are performed respectively, so as to obtain a plurality of adjusted touch sensing data. A location of a touch point on the touch panel is calculated according to the adjusted touch sensing data.

Abstract: A charge pump with limited peak current and improved application flexibility and an LCD having the same. The charge pump has more than three switches in a charge path and more than three switches in a pump path. Furthermore, the charge pump has a voltage detector detecting voltage of the output terminal of the charge pump and a charge pump controller controlling the switches based on the detected voltage. According to the detected voltage, the charge pump controller determines the number of turning-on switches in the charge path and determines the number of turning-on switches in the pump path.

Abstract: A test system for testing a capacitive touch sensor is provided. The test system includes a resistor, a signal generator and a micro controller. A first end of the resistor is electrically connected to a sensing port of the capacitive touch sensor. The signal generator provides a test voltage to a second end of the resistor according to control information. In this way, the resistor generates a test current according to the test voltage, and the capacitive touch sensor provides a voltage difference to the sensing port according to a plurality of switching signals, and converts the test current into test information. The micro controller generates the control information according to a test table, and compares the test information according to the test table, so as to determine whether an operation of the capacitive touch sensor is normal.

Abstract: A voltage regulation circuit including a differential input unit, a source follower and a driving unit is provided. The differential input unit has a first input terminal and a second input terminal for receiving a reference voltage and a system voltage respectively. Further, the differential input unit compares the reference voltage and the system voltage and accordingly generates a control voltage. The source follower is electrically connected between the differential input unit and the driving unit, and generates an adjustment voltage according to the control voltage. The differential input unit, the source follower and the driving unit form a feedback loop, so that the driving unit fixes a source voltage to the system voltage according to the adjustment voltage.

Abstract: A sensing apparatus for a touch panel includes: sensitive capacitors formed between intersections of first electrodes and the second electrodes; a first sensing circuit, for positioning two locations of the first electrodes by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the first electrodes; a second sensing circuit, for positioning two locations of the second electrodes by two objects by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the second electrodes; and a third sensing circuit for sequentially positioning two locations of the scanned electrodes by sensing changed capacitance values of the sensitive capacitors corresponding to the two locations of the scanned electrodes, wherein a control circuit determines the two touch points according to the two locations of the first electrodes, and the two locations of the second electrodes and the two locations of the scanned electrodes.

Abstract: A temperature sensor is provided. The temperature sensor includes: a temperature sensing unit for sensing a temperature and outputting a temperature sensing signal; an analog-to-digital converter (ADC), coupled to the temperature sensing unit, for converting the temperature sensing signal to a digital value, having an ADC output range; a calibration unit, coupled to the ADC, for correlating the ADC output range with at least one temperature range; a memory unit, coupled to the calibration unit, recording the ADC output range, and the at least one temperature range, and the correlation therebetween.