Touch-Sensing Device with Unexpected-Touch Exclusion Logic
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Solution Overview
Problem
Touch screens often incorrectly recognize palm touches as intentional finger or stylus inputs, leading to unexpected operations due to the palm coming into contact with the screen while holding the device, causing errors in user interactions.
Innovation Solution
A touch-sensing method and device that utilize a sensing area defined by intersecting electrode lines to detect touch points, classify touch operations as normal, invalid, or unknown based on the number of detected points and their location within an edge region, effectively distinguishing between intended and unintended touches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch screen senses all touch points without discrimination, then the sensitivity and responsiveness of the touch screen is improved, but the reliability of touch operations deteriorates due to incorrect recognition of palm touches as intentional inputs
Solution Approach 1:
The patent applies local quality by differentiating touch points based on their spatial location. Edge region touch points are treated differently from non-edge region touch points. The system assigns different validation rules to different regions, allowing high sensitivity in non-edge regions while maintaining reliability through edge region filtering.
Solution Approach 2:
The patent changes the parameter of touch point validation by introducing a conditional check based on the number of touch points and their spatial distribution. When the total number of touch points exceeds a threshold, the system changes the validation parameter to require edge region verification, thereby adapting the detection criteria dynamically.
2Ease of operation
If the system accepts all detected touch points as valid inputs, then the ease of operation is improved, but the loss of information increases due to incorrect palm touch recognition
Solution Approach 1:
The patent extracts and isolates edge region touch points from the total touch point set for special processing. By separating these potentially spurious touches from the main validation flow, the system removes incorrect information while preserving valid touch data in non-edge regions.
Solution Approach 2:
The patent introduces an intermediary validation step that checks whether touch points belong to the edge region before accepting them as valid inputs. This intermediary check acts as a filter that prevents incorrect palm touch information from being processed further while maintaining ease of operation for legitimate touches.
3Device complexity
If the touch screen operates without unexpected-touch exclusion, then the device complexity is reduced, but the reliability of user interactions deteriorates due to palm-induced unexpected operations
Solution Approach 1:
The patent segments the touch processing logic into distinct steps: detecting all touch points, checking the total number against a threshold, identifying edge region touch points, and making validation decisions based on this segmented analysis. This segmentation adds reliability without excessive complexity by organizing the validation process into manageable stages.
Solution Approach 2:
The patent performs preliminary actions by pre-defining the edge region and pre-establishing the threshold for total touch point count before actual touch validation occurs. This preliminary setup enables the system to quickly validate touches during operation without complex real-time calculations, maintaining both reliability and acceptable complexity.
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
This approach accurately differentiates between intended and unintended touch events, preventing errors caused by palm contacts and ensuring reliable user interactions on touch screens.
Implementation Method 1
a touch-sensing device comprises a plurality of first electrode lines, a plurality of second electrode lines, and a sensing controller. The first electrode lines and the second electrode lines are intersected and define a plurality of detected points configured as an array.
Data Source
AI summary
A touch-sensing method with unexpected-touch exclusion includes detecting sensing area to obtain touch point; checking total number of detected points forming the touch point with first and second numbers; determining a touch of the touch point as normal touch when the total number is less than or equal to the first number; determining the touch of the touch point as invalid touch when the total number is greater than or equal to the second number; checking if the touch point belongs to an edge region or not when the total number is greater than the first number and less than the second number; determining the touch of the touch point as the invalid touch when the touch point does not belong to the edge region; and determining the touch of the touch point as an unknown touch when the touch point belongs to the edge region.