Capacitive Touch Panel Active Pen Validation via Glass Distortion
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Solution Overview
Problem
Capacitive touch panels on electronic devices, such as smartphones, face malfunctions and reduced operability due to water droplets or similar conductive substances, especially when using active pens, as they fail to accurately detect distortion in the transparent protective layer, leading to erroneous operations.
Innovation Solution
An electronic apparatus with a capacitive touch panel, a transparent protective member, and a pressure detection unit that validates coordinates detected by the touch panel, prioritizing recent valid coordinates when distortion is detected, ensuring accurate operation even with water droplets present, and maintaining active pen operability by validating active pen coordinates regardless of distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distortion detection is used to prevent water droplet interference, then reliability improves, but active pen operability deteriorates due to insufficient distortion signal
Solution Approach 1:
The patent applies different validation rules to different types of indicators. For active pens, coordinates are validated without requiring distortion detection, while for other indicators (finger, gloved finger), coordinates are validated only when distortion is detected. This local differentiation resolves the contradiction by tailoring the validation criteria to the specific characteristics of each indicator type.
Solution Approach 2:
The patent dynamically adjusts the validation criteria based on the type of indicator detected. The control unit determines whether to require distortion detection based on whether the indicator is an active pen or another type, making the validation process adaptive rather than static. This dynamic approach allows the system to maintain high reliability for manual operations while ensuring full operability for active pen operations.
2Ease of operation
If distortion detection threshold is lowered to detect active pen operations, then active pen operability improves, but false detection from water droplets increases
Solution Approach 1:
The patent implements local quality by applying different validation rules to different indicator types. Active pen coordinates are accepted without distortion validation, while other indicator coordinates require distortion validation. This resolves the contradiction by creating specialized handling pathways for different indicator types rather than using a uniform threshold approach.
Solution Approach 2:
The patent segments the coordinate validation process into two distinct pathways: one for active pens that bypasses distortion checking, and another for other indicators that requires distortion verification. This segmentation allows the system to optimize for each indicator type's specific characteristics without compromise.
3Device complexity
If uniform validation rule is applied to all indicators, then device complexity is reduced, but both water droplet detection and active pen detection accuracy deteriorate
Solution Approach 1:
The patent applies local quality by implementing different validation rules for different indicator types. The control unit determines the indicator type and applies the appropriate validation rule, achieving high detection accuracy for both active pens and manual operations without requiring overly complex uniform rules that would compromise performance.
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
Prevents erroneous operations and maintains high operability by validating recent coordinates in the presence of water droplets and ensuring active pen functionality, enhancing reliability and usability in rainy conditions.
Implementation Method 1
a capacitive touch panel unit that transmits display of the display unit, and detects coordinates indicated by an indicator separated from a surface in a predetermined distance
Implementation Method 2
a pressure detection unit that detects distortion of the transparent member
Data Source
AI summary
An electronic apparatus includes a display unit that displays information, a capacitive touch panel layer that transmits display of the display unit, and detects coordinates indicated by an indicator separated from a surface in a predetermined distance, a glass that protects the touch panel layer, and transmits the display of the display unit, a pressure sensor that detects distortion of the glass, and a control unit that validates and invalidates the coordinates detected by the touch panel layer. The control unit validates the coordinates detected by the touch panel layer in a case where the indicator is an active pen, and validates the coordinates most recently detected by the touch panel layer, when a predetermined amount of distortion is detected by the pressure sensor, in a case where the indicator is other than an active pen.