Abstract: A touchscreen display including a touchscreen panel with a set of spaced-apart electrically-conductive transmit lines and a set of spaced-apart electrically-conductive receive lines extending in orthogonal directions. A set of class-D transmit drivers generate transmit signals applied to the transmit lines based on a driving pulse-width-modulated (PWM) signals, respectively. The PWM signals control the amplitude, phase, and slew rate of the pulses of the transmit signals, respectively. The parameters of the pulses are controlled so that the transmit signals arrive with substantially the same amplitude, phase, and slew rate at each receiver regardless of which transmit driver generated the transmit signal. This allows a single anti-phase signal at each receiver to substantially cancel out the receive signal during no panel load.

Abstract: An interface circuit includes an amplifier having a first input, a second input, and an output, a drive capacitor coupled to the first input of the amplifier, and a feedback path coupled between the output of the amplifier and the second input of the amplifier. The interface circuit also includes a current driver coupled to the first input of the amplifier and the second input of the amplifier, wherein the current driver is configured to drive the drive capacitor with a first current, and to drive a touch panel capacitor coupled to the second input of the amplifier with a second current.

Abstract: An interface circuit includes an amplifier having a first input, a second input, and an output, a drive capacitor coupled to the first input of the amplifier, and a feedback path coupled between the output of the amplifier and the second input of the amplifier. The interface circuit also includes a current driver coupled to the first input of the amplifier and the second input of the amplifier, wherein the current driver is configured to drive the drive capacitor with a first current, and to drive a touch panel capacitor coupled to the second input of the amplifier with a second current.

Abstract: A touchscreen display including a touchscreen panel with a set of spaced-apart electrically-conductive transmit lines and a set of spaced-apart electrically-conductive receive lines extending in orthogonal directions. A set of class-D transmit drivers generate transmit signals applied to the transmit lines based on a driving pulse-width-modulated (PWM) signals, respectively. The PWM signals control the amplitude, phase, and slew rate of the pulses of the transmit signals, respectively. The parameters of the pulses are controlled so that the transmit signals arrive with substantially the same amplitude, phase, and slew rate at each receiver regardless of which transmit driver generated the transmit signal. This allows a single anti-phase signal at each receiver to substantially cancel out the receive signal during no panel load.

Abstract: An image processing apparatus operates to process signal samples in a form of color reference signal samples representative of at least part of a color video image to produce legal color signal samples representing a legal color version of the image. The apparatus comprises a color conversion processor arranged to receive the input signal samples and which operates to convert the color reference signal samples from a unipolar form, to bipolar form on a scale between two maxima having opposite polarity, an adjustment factor generator, which operates to generate a plurality of adjustment factors which when combined with the input signal samples have an effect of converting illegal color pixels of the color image into legal color pixels, and a color legalizer coupled to the adjustment factor generator, which operates to combine the adjustment factors with the input signal samples to produce the legalized color signal samples.

Abstract: An image processing apparatus operates to process input signal samples representative of at least part of a colour video image to produce legal colour signal samples representative of a legal colour version of the image. The apparatus comprises an adjustment factor generator, which operates to generate a plurality of adjustment factors which when combined with the input signal samples have an effect of converting illegal colour pixels of the colour image into legal colour pixels, an adjustment factor softener, which operates to soften the adjustment factors whereby distortion in the legal colour video image produced when the adjustment factors are combined with the input signal samples is substantially reduced, and a colour legaliser coupled to the softener, which operates to combine the softened adjustment factors with the input signal samples to produce the legalised colour signal samples.

Abstract: An image processing apparatus operates to process signal samples representative of at least part of a color video image to produce legal color signal samples representative of a legal color version of the image.

Abstract: An image processing apparatus operates to process input signal samples representative of at least part of a color video image to produce legal color signal samples representative of a legal color version of the image.

Abstract: An image processing apparatus operates to process input signal samples representative of at least part of a color video image to produce legal color signal samples representative of a legal color version of the image. The apparatus comprises an adjustment factor generator, which operates to generate a plurality of adjustment factors which when combined with the input signal samples have an effect of converting illegal color pixels of the color image into legal color pixels, an adjustment factor biasing processor coupled to the adjustment factor generator, which operates to change the adjustment factors by combining each of the adjustment factors with a biasing constant, and a color legalizer coupled to the biasing processor, which operates to combine the biased adjustment factors with the input signal samples to produce the legalized color signal samples.

Abstract: An image processing apparatus processes input signal samples representative of at least part of a color video image to produce legal color signal samples. An over sampled version of the input signal samples is produced. A plurality of adjustment factors are generated which, when combined with the input signal samples, have the effect of converting illegal color pixels of the color image into legal color pixels. The over sampled legalized color signal samples are decimated, resulting in a sampling rate corresponding to that of the base input signal samples, by selecting signal samples from the over sampled version of the legalized color signal samples which have not changed with respect to the corresponding input signal samples.

Abstract: A system for generating a variety of solid signals and key signals. The system includes a multiple of solid generators, a multiple of key signal generators and a cross-point switch. Each of the solid generators includes a multiple of solid mixers, and each of the key signal generators includes a multiple of key signal mixers. The cross-point switch is arranged to connect any of the solid generators and key signal generators to any of the switch's main outputs, and to connect any of the solid generators to any of the key generators. The system provides for selection of preset delays to compensate for different signal routings. A timing control controls routing and delay selection.