標題: APPLICATION OF CODE DIVISION MULTIPLE ACCESS TECHNOLOGY IN READOUT CIRCUIT AND SYSTEM DESIGN FOR AN ULTRA-THIN ON-CELL FLEXIBLE CAPACITIVE TOUCH PANEL
作者: Lin, Ying-Jia
Su, Ying-Cheng
Chao, Paul C. -P.
Zhang, Jia-Yu
Pribadi, Eka Fitrah
電機資訊學士班
電機資訊國際學位學程
Undergraduate Honors Program of Electrical Engineering and Computer Science
EECS International Institute
關鍵字: CDMA;Finite element simulation;Multi-channel drive;on-cell capacitive touch panel;readout circuit
公開日期: 1-Jan-2019
摘要: A capacitive sensing circuit including electrodes for a 7-inch ultra-thin flexible on-cell touch panel has been designed. Implementing code-division multiple sensing (CDMS) with Walsh transform to scan Tx electrodes is chosen to improve the signal-to-noise ratio (SNR). The algorithm applies to field programmable logic array (FPGA). The sensing readout algorithm is applied to work on 4 Tx transmitter electrodes and 4 Rx sensing electrodes. The switched-capacitor (SC) circuit is applied to avoid disturbing sample signal from parasitic capacitance and enlarge the voltage difference from capacitance changes of the touch panel. 12-bit ADC to transfer the front-end analog signal to digital code. The digital part adopts a correction algorithm to eliminate the background value of the panel, the moving average algorithm has an adjustable signal-to-noise ratio function, and the Walsh conversion demodulation algorithm improves the touch report rate to achieve high SNR with up-to 34 dB.
URI: http://hdl.handle.net/11536/153682
ISBN: 978-0-7918-5912-4
ISSN: 2576-6090
期刊: PROCEEDINGS OF THE ASME 28TH CONFERENCE ON INFORMATION STORAGE AND PROCESSING SYSTEMS, 2019
起始頁: 0
結束頁: 0
Appears in Collections:Conferences Paper