Touchscreen Driver Circuit With Polarity Control for Uniform Sensing
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Solution Overview
Problem
Touchscreen display devices with embedded touch sensors face challenges in improving touch sensitivity and uniformity while maintaining a thin profile and reducing circuit size, as existing amplifier circuits and charge remover circuits can increase thickness and circuit area.
Innovation Solution
A touchscreen driver circuit that includes a polarity control circuit, integrator circuit, and sampling circuit to control the polarity of touch sensing signals, eliminating the need for a charge remover circuit and enhancing touch sensitivity and uniformity by dividing and processing touch sensing signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an amplifier circuit and charge remover circuit are added to improve touch sensitivity, then touch sensitivity is improved, but circuit area increases
Solution Approach 1:
The patent extracts and eliminates the charge remover circuit from the touch sensing system, retaining only the essential amplifier circuit. This removal reduces circuit area while maintaining touch sensitivity through alternative means (such as optimized amplifier design or different charge removal methodology that doesn't require separate circuit components).
Solution Approach 2:
The amplifier circuit is designed to perform multiple functions: signal amplification, noise filtering, and implicit charge management. By making the amplifier circuit multi-functional, the patent eliminates the need for a separate charge remover circuit, thereby reducing overall circuit area while maintaining touch sensitivity.
2Length of stationary object
If touch sensors are embedded in pixel areas to maintain thin profile, then thickness is reduced, but touch sensing uniformity deteriorates
Solution Approach 1:
The patent applies local quality by optimizing the amplifier circuit characteristics for different regions of the display panel. Each amplifier circuit is tuned to compensate for local variations in touch sensor characteristics, ensuring uniform touch sensing across the entire panel while maintaining the thin profile enabled by embedded touch sensors.
Solution Approach 2:
The patent changes electrical parameters (such as gain, bandwidth, or filtering characteristics) of the amplifier circuit to compensate for the non-uniformity introduced by embedded touch sensors. By dynamically adjusting these parameters, the system maintains touch sensing uniformity despite the thin profile constraint.
3Measurement precision
If amplifier circuit is added to improve touch sensitivity, then touch sensitivity is improved, but device complexity increases
Solution Approach 1:
The patent removes the charge remover circuit from the system, simplifying the overall device architecture. By eliminating this separate circuit component, the patent reduces device complexity while maintaining touch sensitivity through optimized amplifier design.
Solution Approach 2:
The amplifier circuit is designed to handle multiple signal processing tasks (amplification, filtering, and charge management) within a single circuit block. This multi-functionality reduces the total number of circuit components and interconnections, thereby reducing device complexity while maintaining improved touch sensitivity.
Data Source
AI summary
A touchscreen driver circuit and a touch sensor display device are discussed. The touch sensor display device and the touch sensing method can improve touch sensitivity and improve touch sensitivity and the uniformity of a touch sensing signal while reducing the size of a circuit area.