Real-Time Touch Controller with High-Speed Touch Accelerator for Large-Sized Touch Screens

SangHyuck BAE  DoYoung JUNG  CheolSe KIM  KyoungMoon LIM  Yong-Surk LEE  

IEICE TRANSACTIONS on Information and Systems   Vol.E98-D   No.1   pp.193-196
Publication Date: 2015/01/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2014EDL8152
Type of Manuscript: LETTER
Category: Human-computer Interaction
real-time,  FPGA,  parallel processing,  digital filter,  touch controller,  capacitive touch,  

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For a large-sized touch screen, we designed and evaluated a real-time touch microarchitecture using a field-programmable gate array (FPGA). A high-speed hardware accelerator based on a parallel touch algorithm is suggested and implemented in this letter. The touch controller also has a timing control unit and an analog digital convert (ADC) control unit for analog touch sensing circuits. Measurement results of processing time showed that the touch controller with its proposed microarchitecture is five times faster than the 32-bit reduced instruction set computer (RISC) processor without the touch accelerator.