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Robust integrated shift register circuit over clock noises for in-cell touch applications
- Source :
- Journal of the Society for Information Display. 25:537-543
- Publication Year :
- 2017
- Publisher :
- Wiley, 2017.
-
Abstract
- This paper proposes an integrated shift register circuit for an in-cell touch panel that is robust over clock noises. It is composed of 10 thin film transistors and 1 capacitor, and the time division driving method is adopted to prevent the negative effect of display signals on the touch sensing. Two pre-charging nodes are employed for reducing the uniformity degradation of gate pulses over time. In particular, the proposed circuit connects a drain of the first pre-charging node's pull-up thin film transistor (TFT) to the positive supply voltage instead of clock signals. This facilitates to lower coupling noises as well as to clock power consumption. The simulation program with an integrated circuit emphasis is conducted for the proposed circuit with low temperature poly-silicon TFTs. The positive threshold voltage that shifts up to 12 V at the first pre-charging pull-up TFT can be compensated for without the uniformity degradation of gate pulses. For a 60-Hz full-HD display with a 120-Hz reporting rate of touches, the clock power consumption of the proposed gate driver circuit is estimated as 7.13 mW with 160 stages of shift registers. In addition, the noise level at the first pre-charging node is lowered to −28.95 dB compared with 2.37 dB of the previous circuit.
- Subjects :
- 010302 applied physics
Synchronous circuit
Computer science
business.industry
Electrical engineering
Clock gating
Hardware_PERFORMANCEANDRELIABILITY
02 engineering and technology
Digital clock manager
021001 nanoscience & nanotechnology
Clock skew
01 natural sciences
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
Clock domain crossing
0103 physical sciences
Hardware_INTEGRATEDCIRCUITS
Gate driver
Node (circuits)
Electrical and Electronic Engineering
0210 nano-technology
business
Asynchronous circuit
Subjects
Details
- ISSN :
- 10710922
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Journal of the Society for Information Display
- Accession number :
- edsair.doi...........98060453df3c0c00b866fe147d252fe1