Palm Rejection in Position Detection Using Preliminary Stripe Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing position detection methods face inaccuracies and inefficiencies, particularly when dealing with multiple depressed intersecting points, requiring increased stripe density and lower sensing frequencies, which are costly and not sufficiently accurate.
Innovation Solution
A method and device using conductive stripes with a controller to detect depressed intersecting regions and contact points, employing high and low potentials via extension resistors to determine contact impedance and correct positional errors, allowing for higher resolution and accurate detection of multiple objects and gestures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of conductive stripes is increased to detect multiple depressed intersecting points accurately, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies preliminary action by first detecting depressed conductive stripes before determining intersecting regions. The controller identifies which conductive stripes are depressed, then uses this information to narrow down the search space for intersecting regions, thereby reducing the need for high stripe density while maintaining detection accuracy
Solution Approach 2:
The patent segments the detection process into distinct stages: detecting depressed stripes, determining intersecting regions, and identifying contact points. This segmentation allows the system to focus computational and sensing resources efficiently, reducing the overall complexity requirement
2Measurement precision
If the sensing frequency is lowered to accommodate higher stripe density, then measurement precision is improved, but productivity decreases
Solution Approach 1:
By performing preliminary detection of depressed conductive stripes, the system narrows the search space before full intersecting region detection. This two-stage approach allows for lower sensing frequencies while maintaining accuracy, as the preliminary stage filters out non-relevant regions
Solution Approach 2:
The patent implements partial action by not requiring full detection of all intersecting regions at maximum resolution. Instead, it uses preliminary detection to identify relevant areas, then applies full detection only where needed, reducing the overall sensing frequency requirement
3Measurement precision
If comparison values are established for each intersecting point to handle multiple depressions, then measurement precision is improved, but device complexity and storage requirements increase
Solution Approach 1:
The system performs preliminary detection of depressed conductive stripes and determines intersecting regions before establishing comparison values. This preliminary action reduces the number of intersecting points that require individual comparison values, thereby reducing storage requirements while maintaining accuracy for relevant points
Solution Approach 2:
The patent applies local quality by establishing comparison values only for determined intersecting regions rather than all possible intersecting points. This localized approach reduces storage requirements while maintaining detection accuracy where it matters most
4Productivity
If the search space for contact points is not narrowed, then detection coverage is maintained, but detection speed decreases
Solution Approach 1:
The controller performs preliminary detection of depressed conductive stripes and determines intersecting regions before conducting full contact point detection. This preliminary action narrows the search space from the entire sensor area to only relevant intersecting regions, significantly improving detection speed
Solution Approach 2:
The detection process is segmented into stages with progressively narrower search spaces: entire sensor area → depressed conductive stripes → intersecting regions → contact points. This segmentation enables fast detection by eliminating non-relevant areas early in the process
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 enhances detection speed and accuracy by narrowing the search for contact points and intersecting regions, enabling efficient detection of contact points with higher resolution and the ability to distinguish between different objects like pens and palms without suspending the palm during writing.
Implementation Method 1
when a stripe in the upper electrode layer being driven and a stripe in the lower electrode layer being sensed are depressed and made to contact each other, current flows from the driven stripe of the upper electrode layer to the sensed stripe of the lower electrode layer
Implementation Method 2
directly or indirectly via an extension resistor respectively providing high and low potentials to a first end and second end of the same conductive stripe
Data Source
AI summary
The method and the device for position detection with palm rejection are disclosed. The invention provides a sensor and a controller for controlling the sensor. The sensor includes a plurality of strips. The controller execute a first kind of position detection and a second kind of position detection on the sensor. The first kind of position detection identifies an ignored zone, and the second kind of position detection executes the position detection outside the ignored zone.