Touch Coordinate Edge Correction for Presence-Sensitive Displays
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Solution Overview
Problem
Computing devices inaccurately map touch inputs near the edges of presence-sensitive displays due to the lower resolution of touch sensors, causing inputs to be registered away from the intended edge locations.
Innovation Solution
Apply an offset to the detected touch location to correct it towards the nearest edge of the presence-sensitive display, ensuring accurate mapping of inputs at or near the display edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a weighted average of touch sensor cell locations is used to determine touch location, then the touch input can be mapped to a location on the display, but the mapped location may be away from the intended edge location due to lower touch sensor resolution
Solution Approach 1:
The patent changes the coordinate parameters by applying an offset adjustment to the calculated touch location. When a touch is detected in an edge region, the system modifies the x or y coordinate by adding a predetermined offset value that shifts the mapped location toward the display edge, compensating for the resolution limitation of the touch sensor.
2Ease of manufacture
If the touch sensor has lower resolution than the display, then the touch panel can be manufactured more easily, but touch inputs at edge locations cannot be accurately mapped to the display edges
Solution Approach 1:
The system applies a coordinate transformation by adding an offset to the touch location parameters. This parameter change allows the lower-resolution touch sensor to effectively map touches to the correct display edge locations without requiring higher manufacturing precision for the touch sensor itself.
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 precise registration of touch inputs at the edges, improving user interaction accuracy and experience by preventing mapping errors at the display edges.
Implementation Method 1
A capacitive sensor panel is constructed from a matrix of row and column electrodes on either side of a dielectric material. The electrodes are typically constructed from a transparent conductive material, such as Indium Tin Oxide (ITO)... When an electrode is driven with a voltage signal, the electrode's inherent capacitance to other objects (such as a human finger, another electrode, or ground) can be measured.
Data Source
AI summary
One or more processors of a computing device may map touch input data generated by a touch sensor of a presence-sensitive display to a touch location at the presence-sensitive display, wherein the touch input data is indicative of a touch input detected at the presence-sensitive display, determine that the touch location is within an edge region of the presence-sensitive display, in response to determining that the touch location is within the edge region of the presence-sensitive display, determine, based at least in part on the touch location, a corrected touch location at the presence-sensitive display that is closer to a nearest edge of the presence-sensitive display than the touch location, and determine that the touch input corresponds to user input at the corrected touch location of the presence-sensitive display.