Touch Panel Input Device Palm Contact Detection
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Solution Overview
Problem
Existing touch panel systems fail to accurately detect the position of a fingertip or stylus when the edge of the hand, such as the little finger side or palm, comes into contact with the touch-sensitive area, leading to incorrect coordinate data generation.
Innovation Solution
An input device and method that acquire information on affected points on a touch panel, calculate distances from a reference position, select points affected by a fingertip or stylus based on these distances, and determine coordinates to accurately detect the user's input position even when the edge of the hand touches the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch panel stops generating coordinate data when the palm touches the panel, then false touches from the palm are avoided, but the ability to detect the intended fingertip or stylus position is lost
Solution Approach 1:
The patent segments the touched area into multiple detection points and identifies different touch objects (fingertip vs. palm) by analyzing the spatial distribution and characteristics of these points. Instead of treating the entire touched area as a single event, the system divides it into discrete points that can be individually analyzed to distinguish between intentional input and accidental palm contact.
Solution Approach 2:
The patent applies different processing rules to different regions of the touched area. By analyzing local characteristics such as the concentration and distribution of detection points in specific areas, the system can identify which points correspond to the fingertip (intended input) versus which points correspond to the palm (accidental contact), and selectively generate coordinate data only for the intended input points.
2Quantity of substance
If the touch panel detects all touched points, then comprehensive touch information is obtained, but the ability to distinguish between intentional fingertip touches and accidental palm contact is reduced
Solution Approach 1:
The patent performs preliminary analysis of all detected touch points before generating final coordinate data. The system first acquires information about all touched points, then calculates distances between these points and identifies patterns that distinguish fingertip touches from palm contacts. This preliminary processing allows the system to filter and select only the relevant points for coordinate generation, maintaining both comprehensive detection and high precision.
Solution Approach 2:
The patent uses feedback from the spatial relationships between multiple detection points to refine touch position identification. By calculating distances between points and analyzing their relative positions, the system can determine which points represent the intended input and adjust the coordinate generation accordingly, improving measurement precision while utilizing comprehensive touch information.
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
Enables reliable detection of the user's intended position with a fingertip or stylus, even when the edge of the hand or other portions of the hand are in contact, by distinguishing between the touch points and calculating the correct coordinates.
Implementation Method 1
a capacitive touch panel detects whether or not a palm touches the touch panel
Data Source
AI summary
A position indicated by a user with a finger or a stylus can be detected even in a case where an edge of a hand on a little finger side or a wrist touches a touch panel.An input device acquires information indicating a plurality of points on a touch panel affected by a user's touch, including the touch with a finger or a stylus, calculates distances between a reference position and at least some of the plurality of points, the reference position indicating a position touched by the user on the touch panel other than with the finger or the stylus, selects one or more points affected by the touch with the finger or the stylus from the at least some of the plurality of points based on the calculated distances, and acquires coordinates of a position indicated by the user based on the selected point.