Abstract: A capacitive touch sensing circuit includes a first switch˜a fifth switch, an internal capacitor, an integrator and a capacitor. The first switch and an external capacitor are coupled in series between a first voltage and a ground voltage, one terminal of the second switch is coupled between the first switch and the external capacitor, and one terminal of the third switch is coupled to the other terminal of the second switch. The fourth switch and the internal capacitor are coupled in series between a second voltage and the ground voltage, wherein the second voltage is a negative value of the first voltage, and one terminal of the fifth switch is coupled to the other terminal of the second switch and the other terminal of the fifth switch is coupled between the fourth switch and the internal capacitor.

Abstract: A display driving apparatus applied to a panel is disclosed. The panel displays a first image with a first refresh rate. A first refresh cycle corresponding to the first refresh rate includes a refresh period and at least one non-refresh period. The display driving apparatus includes a real-time determination module and a data processing module. The real-time determination module is coupled to the panel and used to immediately determine whether the panel wants to replace the originally displayed first image with a second image during the first refresh cycle. The data processing module is coupled to the real-time determination module and the panel. If a determination result of the real-time determination module is yes, the data processing module immediately controls the panel to start to display the second image at a first time during the first refresh cycle.

Abstract: A liquid crystal display power saving method is disclosed. It includes steps of: (a) dividing output channels coupled to a panel into multiple sets and each set includes M output channels, M is a positive integer; (b) calculating an average of the (N?1)-th display line of the panel after charge sharing, N is a positive integer larger than 1; (c) determining whether each of M output channels consumes power when it transmits a data signal from the (N?1)-th display line to the N-th display line; (d) calculating total power consumption of transmitting the data signal from the (N?1)-th display line to the N-th display line under possible charge sharing methods among the M output channels; (e) selecting a lowest power consumption charge sharing method from the possible charge sharing methods; and (f) switching coupling relationships among the M output channels according to the lowest power consumption charge sharing method.

Abstract: A display apparatus and a voltage calibration method are disclosed. The display apparatus includes a ramp voltage generator, a ramp counter and a timing controller. The ramp voltage generator is configured to generate a ramp voltage. The ramp counter is coupled to the ramp voltage generator and configured to start counting when the ramp voltage generator generates the ramp voltage. The timing controller is coupled to the ramp voltage generator and the ramp counter respectively. When the ramp voltage is increased to be equal to a reference voltage, the timing controller compares an instant count value of the ramp counter with a default value and selectively calibrates a rising slope of the ramp voltage generated by the ramp voltage generator according to a comparing result of the instant count value and the default value.

Abstract: A time multiplexing circuit applied to a DC-DC converting system including first to third NOR gates, first and second inverters, first and second D-type flip-flops, a NAND gate, an OR gate and an AND gate. The first NOR gate and second NOR gate receive the first and second pulse-width modulation signals respectively and output a boost state request signal and a buck-boost state request signal respectively. The first D-type flip-flop outputs a first time multiplex output signal and a first reverse time multiplex output signal. The second D-type flip-flop outputs a second time multiplex output signal and a second reverse time multiplex output signal. The third NOR gate outputs another first time multiplex output signal. The NAND gate outputs another second time multiplex output signal. The OR gate outputs a first reverse output signal. The AND gate outputs a second reverse output signal.

Abstract: A soft-start control circuit includes first to third inverters, first to third comparators, first to fourth resistors, first to fourth D-type flip-flops and a NOR gate. The first comparator outputs a first trigger signal. The second comparator outputs a second trigger signal. The third comparator outputs a third trigger signal. The first D-type flip-flop outputs a first error amplification ready signal. The second D-type flip-flop outputs a second error amplification ready signal. The third D-type flip-flop outputs a high-level output voltage ready signal. The fourth D-type flip-flop outputs a low-level output voltage ready signal. The NOR gate receives an inverted signal of a high-level output voltage enable signal and the third trigger signal and outputs a high-level output voltage control signal to prevent an inrush current of the DC-DC conversion system during a startup process.

Abstract: An active stylus signal identification method applied to a capacitive touch panel is disclosed. When an active stylus and a finger approach the capacitive touch panel at the same time, the active stylus signal identification method includes steps of: (a) during a first period, the active stylus emits an active stylus signal toward the capacitive touch panel according to a protocol; (b) during a second period after the first period, the active stylus stops emitting the active stylus signal and a touch sensing circuit performs a finger touch sensing on the capacitive touch panel; (c) during a third period after the second period, the active stylus emits the active stylus signal toward the capacitive touch panel again according to the protocol.

Abstract: A circuit and method of measuring capacitance are disclosed. The capacitance measuring circuit includes an integrator circuit, a first control circuit, a second control circuit and a processor circuit. The capacitance measuring method includes steps of: using a current source and a charging/discharging time to generate a first charge amount related to a second charge amount of a capacitor to be detected; generating a third charge amount and generating a fourth charge amount according to the first charge amount and the third charge amount; generating a fifth charge amount and generating a remaining charge amount according to the fifth charge amount and fourth charge amount; using an integrator to convert the remaining charge amount into a first voltage and generating a judging result according to whether the first voltage meets a second voltage; and calculating the judging result to obtain a capacitance variation of the capacitor to be detected.

Abstract: A bias generation circuit coupled to a display panel is disclosed. The bias generation circuit includes a linear regulator, a charge pump and a synchronous dual mode boost DC-DC converter. The linear regulator and the charge pump are coupled to the display panel respectively. The synchronous dual mode boost DC-DC converter is selectively operated in a pulse width modulation mode or a pulse frequency modulation mode according to a control signal. In the pulse width modulation mode, the synchronous dual mode boost DC-DC converter controls the linear regulator to generate a first voltage signal to the display panel. In the pulse frequency modulation mode, the synchronous dual mode boost DC-DC converter controls the charge pump to generate a second voltage signal to the display panel.

Abstract: A self-capacitive touch sensing circuit including an operational amplifier, an internal capacitor, a first switch and a second switch is disclosed. A first input terminal and a second input terminal of operational amplifier are coupled to a capacitor and ground respectively and an output terminal of operational amplifier outputs an output voltage. The internal capacitor is coupled between the output terminal and first input terminal of operational amplifier. One terminal of first switch is coupled to a first external charging voltage and another terminal of first switch is coupled between the capacitor and the first input terminal. The first external charging voltage is higher than the second external charging voltage. The first switch and second switch are switched according to a specific order, so that the first external charging voltage or second external charging voltage will charge the capacitor.

Abstract: A gate driving circuit including an input terminal, N delay units, a control signal bus, N buffer units and N output pads is disclosed. The input terminal receives a timing control signal including a total delay time. The N delay units are connected to the input terminal in order. Delay times of N delay units are adjustable and a sum of them is the total delay time. The control signal bus determines delay times of N delay units respectively according to the timing control signal. A first buffer unit of N buffer units is coupled between the input terminal and a first delay unit of N delay units; a second buffer unit, a third buffer unit . . . and an N-th buffer unit are coupled between two corresponding delay units respectively. The N output pads, correspondingly coupled to the N buffer units, output N gate driving signals respectively.

Abstract: A mutual-capacitive touch sensing circuit includes an operational amplifier, an internal capacitor, a first switch˜a third switch. A first input terminal and a second input terminal of operational amplifier are coupled to a capacitor and ground respectively and an output terminal of operational amplifier outputs an output voltage. The internal capacitor is coupled to output terminal and first input terminal. The first switch is coupled to a first external charging voltage, capacitor and first input terminal. The second switch is coupled to a second external charging voltage and the capacitor. The third switch is coupled to a third external charging voltage, the second switch and capacitor. The second external charging voltage and third external charging voltage have same magnitude but opposite polarities. The first switch, second switch and third switch are switched in a specific order to selectively charge the capacitor with different external charging voltages.

Abstract: A driving circuit applied to a LCD apparatus includes N driver chips, a signal source, a WOA wire, a COF wire. Each driver chip is COF-packaged and correspondingly coupled to L output channels. N and L are positive integers and N?2. The signal source is coupled to L output channels of the first driver chip. One terminal of WOA wire is coupled to L output channels of the second driver chip. One terminal of the COF wire is coupled between the signal source and a first output channel of the first driver chip and another terminal of the COF wire is coupled to another terminal of WOA wire. The resistance of COF wire is far smaller than a first internal resistance between the first output channel and L-th output channel of first driver chip and the resistance of WOA wire is substantially equal to first internal resistance.

Abstract: A driving circuit includes an amplifier circuit, a control path, and a control circuit. The control path is coupled to the amplifier circuit. The control circuit is coupled to the control path. The control circuit receives a control signal and outputs a modulation signal to the control path according to the control signal.

Abstract: A charge pump circuit includes a first switch˜a fourth switch, a capacitor, a current source, a first resistor, a second resistor, an amplifier, another current source, a current mirror, a skip detection circuit, a switch generation circuit and a control unit. A method includes: (a) starting the charge pump circuit; (b) operating the charge pump circuit in a first phase, wherein the first switch and second switch are conducted and the third switch and fourth switch are disconnected; (c) operating the charge pump circuit in a second phase, wherein the third switch and fourth switch are conducted and the first switch and second switch are disconnected; (d) determining whether a detected voltage in the skip detection circuit is higher than a threshold voltage; and (e) selectively performing step (b) or (c) again according to determination result of step (d).

Abstract: A LED driving apparatus including a power converter, a judging module and a control module is disclosed. The power converter and the judging module are coupled to at least one LED respectively. The control module is coupled to the judging module. The control module includes a current source and a transconductance amplifier. The current source is coupled to an output terminal of the transconductance amplifier. The power converter converts an input voltage into an output voltage and transmits the output voltage to the at least one LED. The judging module judges whether a LED current is changed from a first LED current value to a second LED current value. If yes, the judging module generates a judging signal to the control module. The control module changes a current value of the current source and a transconductance of the transconductance amplifier.

Abstract: A frequency synthesizing device includes a voltage-controlled oscillator receiving an adjusting signal and generating an output signal according to the adjusting signal. A feedback frequency divider having a plurality of divisor values receives the output signal and generates a feedback signal after performing frequency dividing. An automatic frequency calibration circuit of the frequency synthesizing device includes a first frequency divider receiving a reference frequency, and a second frequency divider receiving the feedback signal. A comparator of the automatic frequency calibration circuit receives and compares outputs from the first frequency divider and the second frequency divider in a predetermined period to generate a comparing result. A state machine outputs the adjusting signal according to the comparing result in a calibration mode.

Abstract: A display driving apparatus including a lightness adjusting unit, a gamma adjusting unit, a pre-charging voltage adjusting unit and a source driving unit is disclosed. The lightness adjusting unit receives and adjusts a lightness of an image data. The gamma adjusting unit adjusts a gamma voltage corresponding to the image data to generate a source data voltage. The pre-charging voltage adjusting unit calculates a highest data voltage and a lowest data voltage which can be outputted by a source electrode and adjusts a pre-charging voltage accordingly to make the adjusted pre-charging voltage the same with the highest data voltage or the lowest data voltage or only a shifted voltage different from the highest data voltage or the lowest data voltage of the image data. The source driving unit outputs the adjusted pre-charging voltage and the source data voltage to a display panel respectively.

Abstract: A capacitive fingerprint sensing apparatus includes sensing electrodes, a sensing driver and a processing module. Under a first self-capacitive sensing mode, the sensing driver combines M adjacent sensing electrodes to form a first sensing electrode set to perform a first self-capacitive sensing to obtain a first self-capacitive fingerprint sensing signal; under a second self-capacitive sensing mode, the sensing driver combines N adjacent sensing electrodes to form a second sensing electrode set to perform a second self-capacitive sensing to obtain a second self-capacitive fingerprint sensing signal. M and N are positive integers larger than 1. The processing module generates a first self-capacitive fingerprint pattern and a second self-capacitive fingerprint pattern according to first self-capacitive fingerprint sensing signal and second self-capacitive fingerprint sensing signal and combines them into a third self-capacitive fingerprint pattern.

Abstract: A capacitive touch panel is disclosed. A touch sensing module in its laminated structure includes same touch sensor patterns. Each touch sensor pattern includes a first electrode, a second electrode and a bridge structure. The first electrode includes a first sub-electrode˜a fourth sub-electrode and the second electrode includes a fifth sub-electrode˜an eighth sub-electrode formed by sections of conductive material having different slopes. First sub-electrode and second sub-electrode are symmetrical to a first direction of a first axis; third sub-electrode and fourth sub-electrode are symmetrical to a second direction of first axis. Fifth sub-electrode and sixth sub-electrode are symmetrical to a third direction of a second axis; seventh sub-electrode and eighth sub-electrode are symmetrical to a fourth direction of second axis. The bridge structure disposed at intersection of first axis and second axis bridges second electrode and provides insulation between second electrode and first electrode.