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Design of Touch Screen Panel Readout System with Direct Sampling Receiver Structure

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Abstract
This dissertation presents a touch screen panel (TSP) readout system design with direct sampling receiver structure. First, a touch screen panel (TSP) readout IC (ROIC) for an ultra-thin organic light-emitting diodes (OLED) display, where display noise injection is severely increased, is presented. We adopted a fully differential (FD) and direct sampling receiver (RX) structure that supports digital in-phase and quadrature (IQ) demodulation to improve tolerance over display noise harmonics intermodulation. Furthermore, we present a touch vector calibration technique that reduces the digital processing burden originating from processing FD touch signals. The proposed IC consists of two chips fabricated in 55 and 130 nm CMOS processes and then packaged into a single package. The signal-to-noise ratio (SNR) is 54.03 dB with a 240 Hz frame rate for the 6.1-inch 16 × 34 ultra-thin OLED TSP, while consuming 65.65 mW.
Second, a TSP self-capacitance sensing (SCS) system with self-capacitance mismatch calibration technique is presented. By introducing the difference in input resistance and driving strength between the fully-differential input pair, the proposed self-capacitance mismatch calibration is efficiently implemented in terms of area and power consumption. The proposed TSP SCS system is designed with a 130 nm CMOS process, and the proposed calibration improves SNR by 19.54 dB
Author(s)
Siheon Seong
Issued Date
2023
Type
Thesis
URI
https://scholar.gist.ac.kr/handle/local/19092
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