Touch Panel Device Ignoring Invalid Foreign Matter Touches
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Solution Overview
Problem
Touch panels often fail to accurately distinguish between user inputs and foreign matter, leading to erroneous determinations and compromised operability due to the presence of objects like business cards, paper sheets, or stationary items on the screen.
Innovation Solution
A touch panel device with a touch detection unit, a touch determination unit, and an instruction acceptance unit that identifies and ignores invalid touches based on criteria such as stationary duration, area thresholds, and time intervals between touches, ensuring that only valid user inputs are accepted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch panel detects all touches on the display, then the touch panel can recognize user operations, but foreign matter on the display is mistakenly detected as valid touches causing erroneous operations
Solution Approach 1:
The patent applies parameter changes by monitoring multiple characteristics of touches including duration, area, position changes, and pressure variations. By analyzing these parameters dynamically, the system distinguishes between valid user touches (which have specific temporal and spatial patterns) and foreign matter (which exhibits different patterns), thereby resolving the contradiction between detecting all touches and filtering foreign matter interference.
Solution Approach 2:
The system implements feedback mechanisms where the touch determination unit continuously monitors touch characteristics and provides feedback to the instruction acceptance unit. This feedback loop allows the system to learn from touch patterns and make intelligent determinations about whether a touch is valid or caused by foreign matter, improving reliability while maintaining responsiveness to user input.
2Device complexity
If the touch panel uses simple touch detection, then the device complexity is low, but the system cannot distinguish between valid touches and foreign matter
Solution Approach 1:
The patent segments the touch processing into distinct functional units: touch detection unit, touch determination unit, and instruction acceptance unit. Each unit handles specific aspects of touch analysis, with the determination unit further segmenting the analysis into multiple criteria (duration, area, position change, pressure). This segmentation allows the system to achieve high measurement precision through coordinated simple operations rather than a single complex mechanism.
Solution Approach 2:
The system applies partial action by selectively analyzing different touch parameters based on the situation. Rather than always measuring all possible touch characteristics, the system measures only the necessary parameters to make a determination, using multiple criteria when needed but relying on simpler single-parameter detection when sufficient. This balances device complexity with measurement precision.
3Adaptability or versatility
If the touch panel accepts all simultaneous touches, then multi-touch operations are supported, but foreign matter causes erroneous multi-touch determinations
Solution Approach 1:
The patent uses parameter changes to differentiate between genuine multi-touch operations and foreign matter interference. By monitoring temporal patterns, spatial relationships, and characteristic variations of each touch, the system can identify when multiple touches are intended by the user versus when foreign matter creates false multi-touch signals, thereby maintaining versatility while ensuring reliability.
Data Source
AI summary
A touch panel device includes a touch detection unit, a touch determination unit, and an instruction acceptance unit. The touch detection unit is configured to detect simultaneous touches on a plurality of points on a display. The touch determination unit is configured to determine whether the simultaneous touches that have been detected include a valid touch or an invalid touch. The instruction acceptance unit is configured to ignore the invalid touch and accept an instruction based on the valid touch.