Touch Panel Line Drawing Detection via Contact Area and Height Analysis
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Solution Overview
Problem
Current touch panel technologies in portable devices can only detect basic operations such as position and slide, limiting the range of operations that can be detected, and require precise finger contact, which restricts the complexity of inputs that can be processed.
Innovation Solution
An operation device with a touch panel that detects the contact position, trace, and change in area or width of contact over time, along with a line drawing determination unit to differentiate between line drawing and other operations, enabling the detection of more complex operations like line drawing and forming closed regions for image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel only detects basic position and slide operations, then the device structure remains simple, but the range of detectable operations is limited
Solution Approach 1:
The patent extends touch detection from two-dimensional position detection to three-dimensional detection by measuring finger height (distance from touch panel surface). This additional dimension enables detection of pressing operations, tapping operations, and other complex gestures that cannot be detected by position-only sensors, thereby increasing operational versatility without requiring multiple separate sensors
2Measurement precision
If the touch panel requires precise finger contact detection, then operation accuracy improves, but rapid touch operations become difficult to perform
Solution Approach 1:
The patent detects touch operations by identifying when finger height exceeds a threshold value (indicating liftoff), rather than requiring continuous precise contact tracking. This partial detection approach allows rapid tapping and flicking operations where the finger briefly contacts or approaches the surface, maintaining high speed operation capability while still achieving sufficient detection accuracy for common gestures
3Adaptability or versatility
If only touch position is detected, then the detection system remains simple, but complex operations like line drawing and closed region formation cannot be identified
Solution Approach 1:
By adding finger height detection to the existing position detection system, the patent creates a three-dimensional touch space that enables differentiation between various operations. For example, line drawing operations can be identified by continuous movement with sustained contact, while closed region formation can be detected by tracing a complete loop, with height data providing additional confirmation of intentional drawing gestures versus accidental touches
Solution Approach 2:
The system continuously monitors touch position and height data, providing real-time feedback that enables identification of operation patterns. By analyzing the sequence and characteristics of touch events (position changes combined with height variations), the system can distinguish between line drawing, closed region formation, and other gestures, making complex operation detection feasible
Data Source
AI summary
An operation device includes a touch panel, a detection unit, and a line drawing determination unit. The touch panel detects a contact position where an object has contacted, and outputs a result of detection. The detection unit detects a trace from a start position of contact to an end position of the contact based on the result of the detection output by the touch panel, and detects a change of an area or a width of the contact of the object with the touch panel from the start position to the end position with time. The line drawing determination unit determines whether a line drawing operation to divide the touch panel by a straight line has been performed based on the trace and the change of the area or the width with time detected by the detection unit.