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12.1 inch Touch Display for Fuel Payment Terminals

Stable Touch Performance Under 6mm Thick Cover Glass
Successfully optimized touch sensitivity for a semi-outdoor fuel payment system using customized 6mm cover glass and industrial-grade controller tuning.
Home » Touch Display for Fuel Payment Terminals

Project Overview

Application: Fuel station payment terminal
Panel size: 12.1” TPM
Current Situation: 
The existing 5mm cover glass resulted in
 Reduced touch sensitivity
 Inconsistent response under fast tapping
 Limited multi-touch stability

This project involved upgrading an existing payment terminal display used in semi-outdoor fuel station environments. The customer required improved touch performance while maintaining mechanical robustness.
 

Technical Root Cause Analysis

Signal Attenuation Caused by Thick Cover Glass

Increasing cover glass thickness increases signal attenuation between finger and the sensor layer.

At 5mm thickness, the signal margin became unstable under specific environmental interference.

 Environmental Noise Sensitivity

Semi-outdoor terminals face EMI, temperature shifts, static, and strong light, which lower touch signal reliability.

 Controller Tuning Limitation

The existing controller configuration lacked sufficient signal amplification and filtering capability to compensate for increased glass thickness.
 
 

Engineering Optimization Strategy

Cover Glass Upgrade

  • Increased cover glass from 5mm → 6mm
  • Total stack thickness: 6mm glass + PCAP sensor
  • Supported thickness range: 2mm–10mm
  • Surface: AG 25±5 GU for semi-outdoor glare control

6mm configuration improved structural rigidity while maintaining stable touch signal margin after controller tuning.

LCM (Display Panel) Strategy


Ensured long-term brightness stability for high-duty payment terminals.

Controller Upgrade & Tuning

  • Upgraded to Microchip maXTouch industrial series
  • Increased signal drive strength by ~15–20%
  • Optimized noise filtering for EMI-rich environments
  • Recalibrated touch threshold for thick-glass stack

Result: Stable multi-touch performance under semi-outdoor interference conditions.

Bonding Configuration


Chosen over optical bonding to reduce cost while reliability targets.

Customer Risk Concern & Our Service Strategy

The Challenge

The customer hesitated to pay high upfront tooling costs without performance validation.

Our Approach
 
 Internally coordinated material resources
 Prepared prototype sample using existing tooling
 Recorded functional demonstration video
 
A sample unit was provided for validation before confirming tooling investment

This reduced initial investment risk while accelerating validation.
 

Need a Reliable Touch Display for Payment Terminals?

If your application requires thick cover glass, outdoor readability, or stable touch performance in challenging environments, our engineering team can help design the right solution.

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