Integrated Device Technology, Inc. recently announced it has demonstrated the world’s first usage of the DisplayPort auxiliary channel to carry touch screen data. The demonstration implements a novel technique for transmitting the touch sensor data over the existing DisplayPort AUX channel to the operating system, simplifying and lowering the cost to integrate touch technology into display devices such as tablets, notebooks, All-in-One devices, monitors, kiosks, and point-of-sale terminals. They showed their new system at this year’s CES. The technology demonstration utilizes the IDTVPP1101 DisplayPort receiver connected to a field programmable gate array (FPGA) that is programmed to interface with the touch sensor’s SPI output and the IDTVDAP1000, a monolithic timing controller, white LED driver, and power management device. The discrete prototype demonstration functions to transmit the touch sensor data over the DisplayPort AUX channel while driving the digital and analog needs of the LCD panel. This technology will enable notebook system manufacturers to eliminate USB interface communication from host to panel and reduce the number of wires that must pass through the display’s hinge, simplifying the design and reducing costs. Likewise, integration of a touch sensor controller alongside a DisplayPort-based LCD timing controller (TCON) will benefit panel manufacturers by reducing IC component count and simplifying the overall system, resulting in lower system cost and smaller physical dimensions.
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