Touch Sensor Layout for Stylus Bezel Signal Rejection
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Solution Overview
Problem
The issue arises when the pen tip of a stylus is located in the bezel area, causing unintended pen signals to be received by FPC connector terminals, leading to unintended lines being drawn on the screen, and the differential method's accuracy is compromised due to unequal noise reception at routing traces.
Innovation Solution
The sensor design includes a touch sensor with electrodes forming a position detection area, FPC connector terminals outside this area, and detection patterns to prevent pen signal reception at these terminals, using routing traces with narrower widths and separation distances to minimize noise differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If FPC connector terminals are disposed in the bezel area to connect linear electrodes, then electrical connection is achieved, but pen signals may be unintentionally received causing unintended lines to be drawn
Solution Approach 1:
The patent extracts the FPC connector terminals from the position detection area by disposing them in the bezel area, separating the connection function from the detection function. This prevents pen signals intended for the touch surface from being accidentally received by the connector terminals, thereby eliminating unintended line drawing while maintaining electrical connection capability.
Solution Approach 2:
The patent introduces routing traces as intermediary elements that electrically connect the linear electrodes in the position detection area to the FPC connector terminals in the bezel area. This mediator allows electrical connection to be maintained while physically separating the components to prevent harmful signal reception.
2Ease of manufacture
If routing traces are used to connect linear electrodes to FPC connector terminals, then electrical connection is established, but noise reception becomes unequal affecting detection accuracy
Solution Approach 1:
The patent applies local quality by making the routing traces narrower in the bezel area compared to the main detection area. This localized change in trace width reduces the noise reception area of the routing traces, ensuring more uniform noise characteristics across different signal paths and improving the accuracy of differential noise cancellation in position detection.
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 design prevents unintended line drawing on the screen by accurately determining the stylus' position and reducing noise interference, thereby enhancing detection accuracy using the differential method.
Implementation Method 1
a detection pattern, which is arranged in the region outside the position detection area and adjacent to the FPC connector terminals, and which is configured to detect the pen signal
Implementation Method 2
FPC connector terminals including first FPC connector terminals, which are connected to the respective first electrodes via first routing traces arranged in a region outside the position detection area
Data Source
AI summary
A sensor is provided for detecting a pen signal transmitted from a pen. The sensor includes a touch sensor, flexible printed circuit (FPC) connector terminals, and a detection pattern. The touch sensor has linear electrodes, which form a position detection area and are configured to respectively detect the pen signal. The FPC connector terminals are connected to the linear electrodes, respectively, via routing traces arranged outside the position detection area. The detection pattern is arranged in a region outside the position detection area, near the FPC connector terminals, and is configured to detect the pen signal.