Patent application number | Description | Published |
20080252627 | DISPLAY ARRAY DRIVING CIRCUIT AND DRIVING METHOD THEREOF - A display array driving circuit is provided. The circuit includes a first memory block, a second memory block, and a main circuit. The first memory block stores the most significant bit (MSB) of the data of one pixel. The second memory block is utilized to store non-MSB bits of the data of the pixel. The main circuit retrieves the MSB of the data of the pixel from the first memory block when the display array is in a predetermined mode, for displaying the pixel data on the display array. In the predetermined mode, the main circuit does not retrieve the non-MSB bits of the data of the pixel, and power consumption is subsequently reduced. | 10-16-2008 |
20080253482 | Receiving circuit and method thereof - A receiving circuit is provided for receiving a data signal and a clock signal, which are RSDS signals, and outputting an output data signal to a data driver. The receiving circuit includes a data comparator, a data intermediate circuit, a clock comparator, a clock intermediate, and a flip-flop. The data comparator, driven with a data bias current, receives the data signal, and outputs a compared data signal. The clock comparator, driven with a clock bias current, receives the clock signal, and outputs a compared clock signal. The flip-flop receives the compared data signal via the data intermediate circuit and the compared clock signal via the clock intermediate circuit. The phase difference between the compared data signal and the compared clock signal is improved by adjusting the data and the clock bias currents. | 10-16-2008 |
20090141016 | LCD DRIVING APPARATUS AND METHOD - The invention discloses a driving apparatus for driving an LCD. The driving apparatus comprises a voltage control unit, an operating unit, a resistance unit, and a voltage selection unit. The operating unit comprises two sets of buffers formed by a plurality of operational amplifiers in negative feedback circuit. The two sets of buffers selectively receive positive polarity voltages and negative polarity voltages respectively. The voltage selection unit is provided with the positive polarity voltages and negative polarity voltages through the operating unit and the resistance unit. The voltage selection unit selectively provides the pixels of the LCD with the positive polarity voltage and the negative polarity voltage. Accordingly, each of the pixels is provided either with the positive polarity voltages or the negative polarity voltages by one of the two sets of buffers. | 06-04-2009 |
20100321336 | TOUCH INPUT DEVICE AND TOUCH SENSOR CIRCUIT - The invention discloses a touch input device and a touch sensor circuit. The touch input device includes a touch panel, a selection module and a differential detection module. The touch panel includes a plurality of capacitive nodes thereon. The selection module is electrically connected with the capacitive nodes of the touch panel. The selection module selects a first capacitive node and a second capacitive node from the capacitive nodes. The second capacitive node is close to the first capacitive node. The differential detection module, electrically connected to the selection module, is used for detecting a capacitance difference between the first capacitive node and the second capacitive node. According to the capacitance difference, the differential detection module generates a touch detection signal. | 12-23-2010 |
20110050664 | APPARATUS AND METHOD FOR GENERATING CHOPPER-STABILIZED SIGNALS - A method for generating chopper-stabilized signals includes the following steps. First, a voltage polarity control signal is received. Next, the voltage polarity control signal is sampled to obtain a sampling signal, and a voltage transformation manner of the voltage polarity inversion of the voltage polarity control signal is judged according to the sampling signal. Then, a frame transformation signal template is obtained according to the voltage transformation manner of the voltage polarity inversion of the voltage polarity control signal and the sampling signal. Next, the frame transformation signal template is compared with the sampling signal and a frame transformation signal is generated. Then, a first chopper-stabilized signal is outputted according to the frame transformation signal and the voltage polarity control signal. | 03-03-2011 |
20110063249 | TOUCH SENSING APPARATUS AND TOUCH SENSING METHOD - A touch sensing apparatus applied to a capacitance touch panel includes a sensing module, a signal generating module, a comparing module, and a processing module. When a first and a second touch point formed on the capacitance touch panel correspond to two first and second touch pad sets, the sensing module generates a request signal. The signal generating module respectively outputs two test signals with reverse phases to the two first touch pad sets according to the request signal. After the comparing module generates a compared result according to two voltage values corresponding to the two second touch pad sets, the processing module will determine the positions of the first and the second touch point according to the compared result. When touch points are more than two, the touch sensing apparatus repeats the above-mentioned steps until all positions of the touch points are defined and the ghost points are removed. | 03-17-2011 |
20110074446 | Capacitance Measurement Circuit and Method Therefor - A capacitance measurement circuit includes an operation amplifier; a reference capacitor having a first terminal coupled to a first input terminal of the operation amplifier and a second terminal selectively coupled to a first or second reference voltage; a sensor capacitor having a first terminal coupled to a second input terminal of the operation amplifier and a second terminal selectively coupled to the first or second reference voltage; an approximation unit having an output terminal and an input terminal coupled to an output terminal of the operation amplifier; a conversion unit having an output terminal and an input terminal coupled to the output terminal of the approximation unit; and a coupling capacitor having a first terminal coupled to the first or second input terminal of the operation amplifier and a second terminal coupled to the output terminal of the conversion unit. | 03-31-2011 |
20110115503 | Capacitance Measurement Circuit and Method Therefor - A capacitance measurement circuit includes: a reference capacitor selectively coupled to a first reference voltage or a second reference voltage; a sensor capacitor selectively coupled to the first reference voltage or the second reference voltage; an operation amplifier coupled to the reference capacitor, the sensor capacitor and a third reference voltage; an approximation unit coupled to the operation amplifier; and a conversion unit coupled to the operation amplifier and the approximation unit. The reference capacitor and the sensor capacitor respectively couple a first charge amount and a second charge amount to a first input terminal of the operational amplifier to conduct an input voltage. The conversion unit couples a third charge amount to the first input terminal of the operation amplifier or charges/discharges the first input terminal of the operation amplifier until the input voltage approximates the third reference voltage. | 05-19-2011 |
20120176326 | CONTROL DEVICE FOR TOUCH PANEL AND SIGNAL PROCESSING METHOD THEREOF - The present invention discloses a control device for a touch panel. The touch panel comprises a plurality of X-directional sensing lines and a plurality of Y-directional sensing lines arranged in a staggered manner. The control device comprises a clock generation circuit, a selection module, an analog to digital conversion circuit, and a control unit. The selection module selects sensing lines to be measured from the X-directional sensing lines and Y-directional sensing lines. The control unit controls the operation mode of the analog to digital conversion circuit. The analog to digital conversion circuit outputs an n-bit digital signal when it operates in a normal mode, and outputs an m-bit digital signal when it operates in a detecting mode, wherein n>m. According to the control device of the present invention, valid data is output in the presence of noise. | 07-12-2012 |
20120182255 | CONTROL DEVICE FOR A TOUCH PANEL - The present invention discloses a control device for a touch panel that comprises a plurality of X-directional sensing lines and Y-directional sensing lines. The X-directional sensing lines and Y-directional sensing lines are arranged in an interlaced manner. The control device comprises a clock generation circuit, a selection module, a driving signal generation circuit, a differential detection module, and a digital-to-analog conversion module. The selection module selects a first sensing line and a second sensing line from the X-directional sensing lines or Y-directional sensing lines. The driving signal generation circuit generates first and second driving signals to the first and second sensing lines, respectively. The digital to analog conversion module selectively outputs a first voltage to the first sensing line or outputs a second voltage to the second sensing line. The operation frequency of the touch panel can be increased using the control device of the present invention. | 07-19-2012 |
20130076376 | CAPACITANCE MEASUREMENT CIRCUIT AND METHOD THEREFOR - A capacitance measurement circuit includes an operation amplifier; a reference capacitor having a first terminal coupled to a first input terminal of the operation amplifier and a second terminal selectively coupled to a first or second reference voltage; a sensor capacitor having a first terminal coupled to a second input terminal of the operation amplifier and a second terminal selectively coupled to the first or second reference voltage; an approximation unit having an output terminal and an input terminal coupled to an output terminal of the operation amplifier; a conversion unit having an output terminal and an input terminal coupled to the output terminal of the approximation unit; and a coupling capacitor having a first terminal coupled to the first or second input terminal of the operation amplifier and a second terminal coupled to the output terminal of the conversion unit. | 03-28-2013 |
20130076377 | CAPACITANCE MEASUREMENT CIRCUIT AND METHOD THEREFOR - A capacitance measurement circuit includes an operation amplifier; a reference capacitor having a first terminal coupled to a first input terminal of the operation amplifier and a second terminal selectively coupled to a first or second reference voltage; a sensor capacitor having a first terminal coupled to a second input terminal of the operation amplifier and a second terminal selectively coupled to the first or second reference voltage; an approximation unit having an output terminal and an input terminal coupled to an output terminal of the operation amplifier; a conversion unit having an output terminal and an input terminal coupled to the output terminal of the approximation unit; and a coupling capacitor having a first terminal coupled to the first or second input terminal of the operation amplifier and a second terminal coupled to the output terminal of the conversion unit. | 03-28-2013 |