Active Stylus Sensor Panel Routing Layout for Uniform Edge Detection
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Solution Overview
Problem
Narrowing the bezel of display panels leads to issues such as superposition of routing traces on conductive parts causing signal uniformity loss, reduced pitch requiring smaller production yields, and decreased stylus detection accuracy near the edge.
Innovation Solution
The sensor panel design includes routing traces with angled connections to trunk lines of equal length, large and small pitch portions, and extension lines farther from terminals, allowing uniform signal distribution and accurate stylus detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If routing traces are placed in the narrowed bezel area, then the display panel bezel is narrowed, but signal uniformity is lost due to superposition on conductive parts
Solution Approach 1:
The patent introduces extension lines that extend routing traces in a direction away from the display area, utilizing the depth dimension of the bezel area. This allows routing traces to be positioned such that they connect to electrodes while extending beyond the display edge, thereby avoiding superposition on conductive parts in the narrowed bezel area and maintaining signal uniformity.
2Area of stationary object
If routing trace pitch is reduced to fit narrowed bezel, then bezel area is utilized, but production yield decreases
Solution Approach 1:
The patent applies different pitch values to different regions of the routing traces. Extension lines have a first pitch value optimized for signal transmission away from the display area, while portions within the display area have a second pitch value. This local differentiation allows efficient space utilization in the narrowed bezel while maintaining production yield through optimized trace spacing in critical areas.
3Device complexity
If electrodes are not extended into bezel area, then routing is simplified, but stylus detection accuracy near edge decreases
Solution Approach 1:
The patent introduces extension lines as intermediary structures that connect the electrode-routing interface to the stylus detection region near the display edge. These extension lines act as mediators that extend the effective sensing area without requiring complex electrode extensions into the bezel, thereby maintaining routing simplicity while improving edge detection accuracy.
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 maintains signal uniformity, improves production yield, and enhances stylus detection accuracy near the display edge by minimizing superposition effects and optimizing trace placement.
Implementation Method 1
routing traces associated respectively with the linear electrodes and connected respectively to the linear electrodes, and a plurality of FPC connection terminals associated respectively with the routing traces and connecting the routing traces to an IC
Implementation Method 2
a sensor panel connected to an IC for detecting the position of an active stylus in a detection area, includes a plurality of linear electrodes extending in a first direction in the detection area and arrayed in the detection area in a second direction transverse to the first direction
Data Source
AI summary
A sensor panel includes a detection area and is coupleable to an integrated circuit (IC) for detecting a position of an active stylus in the detection area. The sensor panel includes a plurality of first electrodes which are elongated and extending along a first direction in the detection area, wherein the plurality of first electrodes are arrayed along a second direction that is transverse to the first direction; a plurality of first routing traces associated respectively with the first electrodes and connected respectively to the first electrodes; and a plurality of first terminals associated respectively with the first routing traces and connecting the first routing traces to the IC. The first routing traces include extension lines formed in an area farther distanced from the first terminals along the second direction, than locations of junctions between the first routing traces and the first electrodes relative to the first terminals.