Active Pen Sensor Panel Layout for Slimmer Display Bezels
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Solution Overview
Problem
The increasing area of the sensor panel outside the active region in tablet electronic equipment hinders bezel slimming, an ongoing trend in recent years.
Innovation Solution
The sensor panel is designed with outer electrodes having a reduced width and/or covering routing wires, and in some embodiments, a higher mesh density outside the active region, to minimize the area outside the active region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor panel is overlaid on the display apparatus with electrodes extending beyond the active region to ensure proper active pen detection, then the detection reliability is improved, but the bezel width increases
Solution Approach 1:
The patent applies different electrode widths at different locations: outer electrodes have reduced widths in the second direction compared to inner electrodes. This local differentiation allows the sensor panel to maintain adequate detection capability within the active region while minimizing the area extending beyond it, thus resolving the contradiction between detection reliability and bezel width.
Solution Approach 2:
The electrode array is segmented into outer electrodes and inner electrodes with different width characteristics. This segmentation allows the outer electrodes to be optimized for boundary conditions (smaller width to reduce bezel area) while inner electrodes maintain larger widths for optimal detection performance within the active region.
2Area of stationary object
If the outer electrodes are reduced in width to minimize the sensor panel area outside the active region for bezel slimming, then the bezel width is reduced, but the active pen signal detection capability may be compromised
Solution Approach 1:
The patent implements local quality by making outer electrodes have smaller widths specifically in the second direction, while maintaining adequate widths in the first direction for signal detection. This localized dimensional optimization allows bezel slimming without sacrificing detection precision in the critical detection zones.
Solution Approach 2:
The electrode width reduction is applied selectively in the second direction (perpendicular to electrode extension) rather than uniformly in all directions. This dimensional selectivity preserves the electrode's ability to detect signals along its length while minimizing its footprint in the direction that affects bezel width.
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 achieves bezel slimming by reducing the area of the sensor panel outside the active region, enhancing the aesthetic appeal of tablet electronic equipment.
Implementation Method 1
the one near the pen tip detects a pen signal and supplies the pen signal to the sensor controller
Data Source
AI summary
A sensor panel is overlaid on a display apparatus and connected to an integrated circuit that detects a position of an active pen in an active region of the display apparatus. The sensor panel includes first electrodes that extend in a first direction. The sensor panel also includes second electrodes that extend in a second direction. The first electrodes include first and second outer electrodes that are located at the outermost edges of the first electrodes and first inner electrodes disposed between the first and second outer electrodes. A width of at least one of the first and second outer electrodes in the second direction is smaller than a width of each of the first inner electrodes in the second direction.