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Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors

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Robust Touch Screen Readout System to Display Noise Using Multireference Differential Sensing Scheme for Flexible

Junmin Lee¹, Hyoyoung Kim¹, Juwon Ham¹

¹Department of Electronic Materials Engineering, Kwangwoon University, Seoul 01897, Korea.

|June 24, 2022

Summary

This study introduces a novel front-end architecture for flexible display touchscreens, enhancing touch sensitivity and reducing display noise interference. The design improves signal-to-noise ratio (SNR) for clearer touch detection.

Keywords:

differential sensing of TSP discrete-time analog sampling mutual capacitance

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Area of Science:

Electrical Engineering
Materials Science
Display Technology

Background:

Flexible displays integrated with touch screen panels (TSPs) face significant display noise interference.
This interference is an uncommon mode caused by the large panel load of the TSP in flexible displays.
Existing methods struggle to effectively mitigate this severe noise, impacting touch performance.

Purpose of the Study:

To propose and validate a new front-end architecture for TSP readout in flexible displays.
To mitigate severe display noise interference and enhance touch sensitivity.
To improve the signal-to-noise ratio (SNR) for reliable touch detection.

Main Methods:

Implemented a differential sensing method with multi-reference TSP channels to minimize noise imbalance.
Employed cascaded time-discrete bandpass sampling to boost touch sensitivity.
Utilized a reconfigurable front-end block and programmable postfiltering for offset cancellation and sensitivity enhancement.

Main Results:

Achieved a signal-to-noise ratio (SNR) of 50.5 dB at a 200 Hz scan rate.
Attenuated aggravated display noise interference by over 6.84 dB compared to conventional methods.
The designed chip occupied 4.8 mm² and consumed 17.6 mW from a 3 V supply.

Conclusions:

The proposed front-end architecture effectively mitigates display noise interference in flexible TSPs.
The design offers enhanced touch sensitivity and improved SNR, crucial for advanced display applications.
The architecture is power-efficient and compact, suitable for integration into ultrathin flexible displays.