Galvanic Isolator for Touch Panel IC Noise Reduction
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Solution Overview
Problem
Conventional touch panels in display devices suffer from 'ghosting' or 'ghost touches' due to electronic noise from equipment, leading to undesirable detection of touches without user input.
Innovation Solution
Incorporating a touch panel controller with a second low voltage source and a galvanic isolator that electrically isolates the touch panel IC from the display assembly, preventing ground noise interference and eliminating ghost touches by providing a separate signal ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch panel IC is electrically connected to the display assembly using a common ground, then the system structure is simple, but ground noise interferes with touch detection causing ghost touches
Solution Approach 1:
The patent divides the electrical connection into separate pathways by introducing a galvanic isolator that creates distinct signal and power ground paths. This segmentation prevents ground noise from the display assembly from interfering with touch panel detection, resolving the contradiction between simple structure and reliable touch detection.
Solution Approach 2:
The galvanic isolator acts as an intermediary component between the touch panel IC and display assembly. It provides electrical isolation while maintaining signal transmission, thereby eliminating ground noise interference without requiring complete redesign of the connection architecture.
2Adaptability or versatility
If electronic equipment operates near the display device, then the system provides comprehensive functionality, but electronic noise causes ghost touches
Solution Approach 1:
The patent acknowledges that electronic noise from nearby equipment is unavoidable but converts this harmful factor into a manageable issue by using the galvanic isolator to block noise while preserving necessary signal transmission. This allows comprehensive system functionality while protecting against noise-induced ghost touches.
3Measurement precision
If a galvanic isolator is introduced to electrically isolate the touch panel IC, then ground noise interference is reduced, but the device complexity increases
Solution Approach 1:
The patent changes the electrical connection parameters by introducing galvanic isolation, which fundamentally alters the ground reference relationship between the touch panel IC and display assembly. This parameter change enables precise touch detection while the modular nature of the isolator minimizes the practical increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces ground noise interference, minimizing ghost touches and improving the accuracy of touch input detection in display devices.
Implementation Method 1
a galvanic isolator configured to electrically isolate the touch panel IC from the display assembly
Data Source
AI summary
Methods and systems for a display device having a touch panel are provided. In one aspect, the display device may comprise a sensor glass for sensing a touch and providing a touch input signal; a touch panel controller that includes a touch panel integrated circuit (IC) coupled to the sensor glass and a first low voltage source; and a display assembly that includes an isolator that couples the touch panel IC to the display assembly, with the isolator electrically isolating the touch panel IC from the display assembly. In another aspect, the display device includes a touch panel controller that receives a touch input signal from a sensor glass and provides touch information.