Touch Control Unit Reference Position Update Logic
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Solution Overview
Problem
Users experience difficulty in achieving proportional linearity between finger or pen movement and parameter change during slide operations on touch-sensitive surfaces, particularly in regions where touch detection is challenging, leading to unnatural finger attitudes and discrepancies in intended and actual movement distances.
Innovation Solution
An electronic apparatus with a touch detector and processor configuration that updates a reference position based on predetermined distance movements in specific directions, executing functions only when the touch position moves within a stable detection region, and not updating the reference position when the touch position reaches an unstable region, thereby improving the operational feeling of slide operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a slide function is executed in proportion to a change amount of a position coordinate output on the basis of a detected touch operation, then the parameter can be changed according to the movement distance, but the user may not feel the linearity proportional to the moving operation of a finger or a pen in regions where touch detection is difficult
Solution Approach 1:
The patent applies local quality by differentiating between a first region (stable detection region) and a second region (unstable detection region) on the touch detection surface. Different processing rules are applied to each region: in the first region, the reference position is updated normally to maintain linearity, while in the second region, the reference position is not updated to avoid detection errors. This regional differentiation resolves the contradiction by adapting the processing method to the local detection quality.
Solution Approach 2:
The touch detection surface is segmented into multiple regions based on detection stability characteristics. By dividing the continuous touch surface into discrete functional zones (first region with stable detection and second region with unstable detection), the system can apply different operational rules to each segment, thereby maintaining overall system performance despite local variations in detection quality.
2Productivity
If the reference position is updated whenever the touch position moves by a predetermined distance, then the slide function responds continuously to user input, but the finger or pen attitude becomes unnatural in regions where it is difficult to touch
Solution Approach 1:
The update rule for the reference position is made local rather than uniform. In the first region, updates occur continuously to maintain fast response, while in the second region, updates are suppressed to prevent unnatural finger attitudes. This localized control strategy resolves the contradiction between response speed and operational naturalness by adapting the update frequency to the local touch characteristics.
3Adaptability or versatility
If the touch detection surface includes regions where it is difficult to touch, then the device can accommodate various finger attitudes, but the linearity between moving distance and parameter change is compromised
Solution Approach 1:
Instead of trying to make the touch detection work perfectly in all regions, the patent inverts the approach by identifying problematic regions and excluding them from the normal update process. Rather than forcing linearity in the second region, the system accepts the detection limitations and uses a different strategy (not updating the reference position) to maintain overall system reliability and usability.
Data Source
AI summary
An electronic apparatus includes: a touch detector; and a control unit: (1) to execute a first function in response to movement by a predetermined distance in a first direction and to update the reference position when a detected touch position has moved in the first direction, (2) to execute a second function in response to movement by the predetermined distance in a second direction and to update the reference position when the detected touch position has moved in the second direction and the detected touch position after the movement is in the first region, and (3) not to execute the second function and not to update the reference position even if a movement distance reaches the predetermined distance when the detected touch position has moved in the second direction and the detected touch position after the movement is in the second region.