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A Mutual Capacitance Touch Readout IC with Synchronization in Touch and Mobile Display Driving for High Refresh Rate
1Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Korea.
Micromachines
|August 27, 2021
Summary
This study introduces a novel mutual capacitance touch readout IC architecture for high-refresh-rate AMOLED displays. The design significantly reduces display noise, improving touch screen performance.
Area of Science:
- Integrated Circuit Design
- Display Technology
- Human-Computer Interaction
Background:
- High-refresh-rate AMOLED displays amplify display noise on touch screen panel (TSP) electrodes.
- This amplified noise interferes with accurate touch detection.
Purpose of the Study:
- To present a mutual capacitance touch readout IC architecture for 120 Hz AMOLED displays.
- To mitigate severe display noise and improve TSP performance.
Main Methods:
- Synchronizing TSP driving with AMOLED pixel circuits.
- Employing a differential sensing technique for noise suppression.
- Utilizing a chopping scheme to cancel front-end circuit offset.
Main Results:
- Reduced display noise by over 11.6 dB compared to conventional methods.
- Achieved a 120 Hz scan-rate operation.
- Demonstrated a prototype IC with low power consumption (6.4 mW) and small area (8.02 mm²).
Conclusions:
- The proposed architecture effectively mitigates display noise in high-refresh-rate AMOLED panels.
- The differential sensing and chopping schemes are key to noise reduction.
- The IC offers a practical solution for enhanced touch screen functionality in advanced displays.
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