Touch Panel Input Control with Movement Detection
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Solution Overview
Problem
In vehicle-mounted systems with compact display devices and touch panels, users face challenges in accurately performing button operations due to small button sizes and unstable environments, leading to unintended button selections and operation errors caused by vehicle movement.
Innovation Solution
An input control apparatus that includes a screen display unit, a button-deciding-operation by release accepting unit, a button-deciding-operation by long-touch accepting unit, and a finger-movement detecting unit, which accepts button operations based on predetermined time periods and movement detection to prevent mis-touch errors, utilizing vibration and color changes to assist user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of buttons displayed on the touch panel is reduced to fit compact display devices, then the display device can be made more compact, but the user's ability to accurately touch the desired button deteriorates
Solution Approach 1:
The system performs preliminary actions by detecting finger movement during the touch period and preemptively preventing erroneous button selection before the user releases their finger. The controller monitors touch position changes and blocks the release operation if movement exceeds a threshold, thereby preventing mis-touch errors before they occur.
2Ease of operation
If the touch period is extended to allow users more time to locate and touch the desired button, then the ease of operation improves, but the probability of touched position changing due to vehicle movement increases
Solution Approach 1:
The system dynamically adjusts its response based on the touch period duration. For short touch periods, it accepts release operations to enable quick interactions. For long touch periods where finger movement is detected, it switches to preventing release operations, thereby adapting the system behavior to the specific interaction context to maintain reliability.
Solution Approach 2:
The system provides feedback by monitoring touch position changes during the touch period and using this information to determine whether to accept or prevent the release operation. The controller continuously tracks finger position and compares it against threshold values to make real-time decisions about operation validity.
3Ease of operation
If the touched position just before release is unconditionally accepted as the decided button, then the ease of operation improves, but operation errors occur when the touched position changes due to vehicle movement
Solution Approach 1:
The system monitors touch position changes during the touch period and uses this feedback to determine whether to accept or prevent the release operation. By continuously tracking finger position and comparing it against threshold values, the system can identify when the user has moved their finger to a different button area and prevent erroneous selections.
Solution Approach 2:
The system applies preliminary anti-action by detecting finger movement that indicates unintended button selection and preemptively preventing the release operation that would confirm the erroneous selection. This counter-action occurs before the button decision is finalized, blocking the harmful effect of mis-touch.
Data Source
AI summary
A main control unit accepts an operation of deciding a touched button when the user releases the button on a touch panel in a menu window within a predetermined time period after touching the button without moving his/her finger along the touch panel. Also, the main control unit accepts an operation of deciding a touched button when the user keeps the button touched for more than the predetermined time period after touching the button without performing finger movement. When the user moves his/her finger along the touch panel to another position after touching a button without releasing the button in the predetermined time period, the main control unit does not accept a button deciding operation by release or long touch thereafter.