69‐1: 43 Inch UHD Digital Kiosk System Using Advanced In‐cell Touch Technology

Abstract

Proposed kiosk touch system adopts both the ultra-high resolution (UHD) LCD display and the advanced in-cell (AIT) touch scheme which uses the display common voltage plate as touch electrodes. In this kiosk system, a several touch performance limitations are occurred by the large display size and the long display driving time. The number of touch node is optimized in order to resolve the limitations. In addition, the cost of the kiosk system should be considered concurrently. As the number of touch electrode node decreases, the size of touch electrode increases. This increases the parasitic capacitance of touch electrode. To drive this large parasitic capacitance, the load free driving scheme has been adopted and the operation amplifier with both the high current driving ability and the low power dissipation has been also chosen. To deal with the transportation of a number of touch data, proposed bus type touch data interface is used between readout and algorithm operation block.