Abstract: A driving frequency selection method is used in a capacitive multi-touch system. When the system operates in an idle mode, an active driving frequency is selected randomly from N candidates, and a self-capacitance driving and sensing is used to detect touch points. When there are touch points, the capacitive multi-touch system is switched to an active mode to acquire an image raw data for finding the positions of touch points. In the active mode, noise is calculated from the image raw data. When the noise exceeds a predetermined value, the system is switched back to the idle mode, and the self-capacitance driving and sensing is applied to N?1 active driving frequencies other than the previously selected active driving frequency to acquire N?1 self-capacitance image raw data. The method determines one with a minimum noise and selects the corresponding frequency as a currently active driving frequency.

Abstract: A DC-DC converter with auto-switching between pulse width modulation (PWM) and pulse frequency modulation (PFM) is used in an organic light emitting diode (OLED) display and judges power consumption of an OLED array of the display according to display data of the display and thus determines a switching time between PWM and PFM. The converter comprises a content statistic unit, an auto-switching control unit, a PWM controller, a PFM controller and a power generator. The content statistic unit receives and accumulates the display data of the OLED display and then outputs a statistic value. The auto-switching control unit outputs a control signal according to the statistic value to control the PWM controller and the PFM controller and to switch to a PWM mode or a PFM mode.

Abstract: A low power driving and sensing system for capacitive touch panels includes a capacitive touch panel, a first switch device, a second switch device, a driving device, a sensing device, and a control device. The capacitive touch panel has plural first conductor lines arranged in a first direction and plural second conductor lines arranged in a second direction. The driving device is connected to the first switch device for driving the capacitive touch panel. The sensing device is connected to the second switch device for sensing the capacitive touch panel. The control device configures the first switch device and the second switch device for entering the capacitive touch panel into a self-capacitance mode such that the driving device and the sensing device perform a self capacitance sensing, and into a mutual capacitance mode such that the driving device and the sensing device perform a mutual capacitance sensing.

Abstract: A low power switching mode driving and sensing method for capacitive multi-touch systems is used in a capacitive multi-touch system with a capacitive touch panel. When the capacitive touch system operates in an idle mode, the method uses a self-capacitance driving and sensing technology to detect touch points. When the touch points are detected on the capacitive touch panel, the capacitive touch system is switched to an active mode and uses a mutual-capacitance driving and sensing technology to detect touch points for accurately acquiring the positions related to the touch points detected. During a predetermined time interval in which there is no touch point detected, the method automatically performs a calibration to update a mutual-capacitance base image raw data and a self-capacitance base image raw data, so as to overcome the drifting of sensors of the capacitive touch system.

Abstract: A unity-gain buffer includes an operational amplifier, a control stage, and an auxiliary output stage. The operational amplifier includes a non-inverting input terminal, an output terminal, and an inverting input terminal. The control stage is connected between the non-inverting input terminal and the output terminal of the unity-gain buffer. The auxiliary output stage is connected between the control stage and the output terminal of the unity-gain buffer. According to an input voltage at the input terminal of the unity-gain buffer, the control stage generates a first driving current, the auxiliary output stage generates a second driving current, and the operational amplifier generates a third driving current, so that an overall driving current outputted from the output terminal of the unity-gain buffer is equal to the sum of the first driving current, the second driving current and the third driving current.

Abstract: In a demodulation system for a low-power differential-sensing capacitive touch panel, the capacitive touch panel has n first conductor lines in a first direction and m second conductor lines in a second direction, and a mutual capacitance is generated at each intersection of the n first conductor lines and the m second conductor lines. The demodulation system has a signal generator, a detection circuit, a programmable gain amplifier, an analog to digital converter. During a driving cycle, the signal generator generates a pair of differential driving signals to drive two of the first conductor lines in the first direction for eliminating common noises of the two first conductor lines and avoiding the common noises from being amplified by the programmable gain amplifier.

Abstract: A pixel data conversion method for display with delta panel arrangement converts an input video signal into a temporary video signal which is a first RGB signal with 960 horizontal resolution in strip panel arrangement and converts the temporary video signal into an output video signal which is a RGB signal with 320 horizontal resolution in delta panel arrangement. Each line of the output video signal has 960 pixels, wherein a sequence of red pixel, green pixel, and blue pixel is repeatedly arranged for an odd-numbered horizontal line, and a sequence of green pixel, blue pixel, and red pixel is repeatedly arranged for an even-numbered horizontal line. The position of each pixel in an even-numbered horizontal line has a half-pixel dislocation to the position of each pixel in an odd-numbered horizontal line.

Abstract: A pixel data conversion method for display with delta panel arrangement converts an input video signal into a temporary video signal which is a first RGB signal with 640 horizontal resolution in a strip panel arrangement and converts the temporary video signal into an output video signal which is a RGB signal with 320 horizontal resolution in the delta panel arrangement. Each line of the output video signal has 960 pixels. A pixel size ratio is defined as a ratio of a pixel size of the delta panel to a pixel size of the strip panel. The 320 horizontal resolution is obtained by dividing the 640 horizontal resolution by the pixel size ratio and then by three.

Abstract: An in-cell multi-touch panel system includes: an in-cell touch display panel, a touch display control system. In a first frame time interval, the touch display control system drives the in-cell touch display panel and samples the sensing voltage from the in-cell touch display panel to determine whether there is an approaching external object and noise interference. In a second frame time interval, the touch display control system finds out a frequency with minimum noise for use as a frequency of the touch driving signal when the noise interference exists. In a third frame time interval, the touch display control system is based on the frequency with minimum noise to correspondingly generate the touch driving signal so as to determine whether there is an approaching external object.

Abstract: A charge-sharing control method for a display panel includes the following steps. Firstly, a first switch set is turned on, so that a first voltage driving unit provides a first positive driving voltage to a first data line and a second voltage driving unit provides a first negative driving voltage to a second data line. Then, a second switch set is turned on, so that a first charge storage unit has a positive common voltage and a second charge storage unit has a negative common voltage. Then, a third switch set is turned on, so that the first data line and the second data line are electrically connected with a ground voltage. After a polarity inversion, the second data line is charged according to a first comparison result and the first data line is discharged according to a second comparison result.

Abstract: In a method of skin tone optimization in a color gamut mapping system, an image signal is first transformed from a predetermined color domain to an HSV color domain for generating an HSV image signal. Next, a skin tone optimization is performed on the HSV image signal for generating an adjusted saturation gain. Then, a color enhancement is performed on the HSV image signal according to the adjusted saturation gain and a color shift signal so as to generate a color enhancement signal. Finally, the color enhancement signal is transformed from the HSV color domain to the predetermined color domain.

Abstract: In a driving method for reducing display interference in in-cell multi-touch panel, a display driving signal is provided to K gate lines and a display image signal is provided to L source lines so as to drive corresponding transistors and capacitors in a display frame for displaying an image. The method also provides a touch driving signal to N touch driving lines and receives touch signals from M sensing lines to thereby detect one or more touch point positions of an external object in a touch frame based on the touch driving signal. In each touch frame, a sequence of providing the touch driving signal to N touch driving lines is different.

Abstract: In a sensing method using self-capacitance and mutual-capacitance alternatively to reduce touch noises, a control device configures a first driving and sensing device and a second driving and sensing device to perform an initialization. The control device configures the first and second driving and sensing devices to perform at least one self-capacitance sensing for producing a first possible touch point range during a first work mode. Then, the control device configures the first and second driving and sensing devices to perform at least one mutual-capacitance sensing for producing a second possible touch point range during a second work mode. The control device determines if there is range conjunction between the first and second possible touch point ranges. The control device produces a possible touch point range conjunction and calculates coordinates of touch points based on the possible touch point range conjunction.

Abstract: A bootstrap circuit includes an input terminal, an inverting input terminal, an output terminal, an inverting output terminal, a first sub-bootstrap circuit, a second sub-bootstrap circuit, and a charging path providing circuit. The first sub-bootstrap circuit includes a first bootstrap capacitor, a first charging path, a first discharging path, and a first high voltage providing path. The charging path providing circuit includes a third charging path. In response to a high voltage level inputted into the input terminal, the first charging path and the third charging path are turned on, the first bootstrap capacitor is charged to a capacitor voltage, and the first discharging path is turned on to discharge the output terminal. In response to a low voltage level inputted into the input terminal, a first superimposed voltage including the high voltage level and the capacitor voltage is provided to the output terminal.

Abstract: A method of fixed bit-rate image compression/decompression based on 2×2 image unit encodes an image that is divided into a plurality of 2×2 coding units. The method determines whether a 2×2 coding unit has one of first to seven man-made patterns. When the 2×2 coding unit has one of the first to seven man-made patterns, a differential error encoding and a quantization and look-up are performed on the 2×2 coding unit for generating a first coded data. Otherwise, the 2×2 coding unit is a natural pattern, and the method sequentially performs a color domain transform, a discrete cosine transform, and a quantization and look-up on the 2×2 coding unit for generating a second coded data.

Abstract: An operational amplifying device with auto-adjustment output impedance includes an operational amplifier and first to third signal paths. The operational amplifier has an output connected to its inverting input, and a non-inverting input for receiving an input signal. The first signal path has one end connected to the output of the operational amplifier and the other end connected to a first output node. The second signal path has one end connected to the output of the operational amplifier and the other end connected to the first output node. The third signal path has one end connected to the output of the operational amplifier and the other end connected to the first output node. The first signal path is normally on, and the second and third signal paths are normally off. The first signal path has high impedance, and each of the second and third signal paths has low impedance.

Abstract: The present invention provides a level shifter. In an embodiment, the level shifter includes first to sixth transistors. The first and second transistors have common control nodes coupled to a first bias voltage, receive a pair of input signals and respectively provide a first output node and a second output node. The fifth and sixth transistors have common control nodes coupled to a second bias voltage to form a current mirror. The third transistor is coupled between the first and the fifth transistors and has a control node coupled to the second output node. The fourth transistor is couple between the second and the sixth transistors and has a control node coupled to the first output node.

Abstract: A noise reduction system includes a driving device, a sensing device, a first switch, a second switch, and a controller. The driving device has a plurality of drivers for generating touch driving signals. The sensing device has a plurality of sensors for detecting whether there is an external object approached and generating touch sensing signals. The first switch is provided for electrically connecting the plurality of drivers and the plurality of sensors to the capacitive touch panel. The second switch is provided for electrically connecting the plurality of drivers and the plurality of sensors to the capacitive touch panel. The controller configures the first switch and the second switch to perform a first direction driving and second direction sensing, and configuring the first switch and the second switch to perform a second direction driving and first direction sensing.

Abstract: An in-cell multi-touch display panel system includes a multi-touch LCD display panel and a touch display control subsystem. The multi-touch LCD display panel has a TFT layer, a detection electrode layer, and a common-voltage and touch-driving layer. The detection electrode layer has M first conductor lines for performing touch detection by sampling touch detection from the M first conductor lines. The common-voltage and touch-driving layer has N second conductor lines for receiving common voltage in display and touch-driving signal in touch detection. In the detection electrode layer, there are pluralities of detection electrode areas in the intersections of first conductor lines and second conductor lines. Each detection electrode area is connected to a first conductor line by a touch-control transistor. The M×N touch-control transistors are divided in to N sets corresponding to N second conductor lines respectively.

Abstract: An apparatus of approximating backlight spread is used in a display to estimate a backlight spread image corresponding to an image after backlight spreading of a plurality of backlight sources arranged in a matrix form. An equalizer receives backlight pulse width modulation signals of the backlight sources for performing an equalization operation and generating corresponding equalization signals. A backlight seed image constructor receives the equalization signals to establish a backlight seed image. A first calculation unit calculates positions corresponding to the backlight seed image based on a backlight spread image. A second calculation unit calculates coordinates of the backlight seed image corresponding to the positions. A distance calculator calculates distance differences between the positions and coordinates of the backlight seed image.