Stylus Sensor Panel Routing Layout for Narrow-Bezel Edge Accuracy
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Solution Overview
Problem
Narrowing the bezel of display panels leads to issues such as non-uniform distribution of stylus signals due to superposition with electrically conductive parts, reduced pitch requiring smaller routing traces, and decreased stylus detection accuracy near the display edges.
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 further from terminals, ensuring uniform signal distribution and improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If routing traces are placed in the narrowed bezel area, then the sensor panel can be integrated with the display panel, but the routing traces superpose on electrically conductive parts causing non-uniform signal distribution
Solution Approach 1:
The routing trace pitch is varied locally across different regions of the bezel area. In regions where routing traces superpose on electrically conductive parts, a larger pitch is used to reduce capacitance coupling and maintain uniform signal distribution. In regions with less superposition, a smaller pitch can be used to maximize space utilization.
2Area of stationary object
If the bezel area is narrowed to meet display requirements, then the display-to-bezel ratio is improved, but the routing trace pitch must be reduced leading to lower production yield
Solution Approach 1:
Instead of uniformly reducing the routing trace pitch across the entire bezel area, the patent applies different pitch values to different regions. This allows the majority of the bezel area to maintain a larger, more manufacturable pitch, thereby preserving production yield while still fitting all necessary routing traces within the narrowed bezel constraints.
Solution Approach 2:
The patent optimizes the routing trace layout by considering both the x-direction and y-direction arrangements. By strategically positioning traces and utilizing two-dimensional space optimization, the design accommodates all required connections without requiring uniformly small pitch, thus maintaining manufacturability.
3Area of stationary object
If the bezel area is narrowed, then the display panel occupies more space, but electrodes cannot be extended in the bezel area reducing stylus detection accuracy at edges
Solution Approach 1:
The patent extends electrode functionality into the routing trace region by arranging electrodes and routing traces in different spatial layers or orientations. This allows electrode extension into areas that would otherwise be occupied by routing traces, improving stylus detection accuracy at display edges without requiring additional bezel space.
Data Source
AI summary
A sensor panel is connectable to an integrated circuit for detecting a position of an active stylus in a detection area. The sensor panel includes first electrodes extending along a first direction and arrayed along a second direction that is transverse to the first direction; first routing traces connected respectively to the first electrodes; and first terminals connecting the first routing traces to the integrated circuit. The first routing traces have a first portion and a second portion physically adjacent to each other along the second direction, in a first routing trace area disposed adjacent to the detection area along the first direction. The first portion includes a large-pitch portion in which the first routing traces are arrayed at a first pitch, and the second portion includes a small-pitch portion in which the first routing traces are arrayed at a second pitch smaller than the first pitch.