Touch Panel Trace Layout for Uniform Resistance and Narrow Bezels
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Solution Overview
Problem
The unequal trace resistances between touch units and the touch control module on touch display panels lead to inconsistent signal transmission, resulting in inaccurate touch responses and an increased bezel size due to the need for space to compensate for these resistances in non-active areas.
Innovation Solution
Implementing a second metal trace in the touch electrode areas to compensate for trace resistances between touch units and the pad, allowing for resistance adjustment without occupying the bezel space, thereby ensuring a smaller bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If trace compensation is implemented in the non-active area by adjusting trace lengths or widths, then the trace resistance uniformity is improved, but the bezel size is increased
Solution Approach 1:
The patent moves the trace compensation from the non-active area (2D plane adjustment) to the active area by utilizing the Z-dimension (vertical stacking). Multiple metal traces are arranged in different layers (first metal trace layer, second metal trace layer) to form a three-dimensional trace compensation structure, allowing resistance adjustment without occupying additional bezel space.
Solution Approach 2:
The patent embeds multiple metal traces within each other in a stacked configuration. The first metal trace and second metal trace are positioned at different heights and can be electrically connected through conductive structures, creating a nested trace architecture that compensates for resistance variations while maintaining a compact form factor.
2Device complexity
If the pad position is fixed on the side of the touch display panel, then the connection structure is simplified, but the trace resistance between touch units and pad becomes non-uniform
Solution Approach 1:
The patent divides the trace compensation function into multiple independent metal traces (first metal trace, second metal trace, etc.) arranged in different layers. Each trace segment can be independently designed and adjusted to compensate for resistance variations, while the overall connection structure remains relatively simple with traces extending to the fixed pad position.
Solution Approach 2:
The patent introduces vertical layering with multiple metal trace layers to compensate for trace resistance non-uniformity. This three-dimensional arrangement allows different trace paths at different heights to be optimized independently, achieving resistance uniformity without changing the two-dimensional pad position or overall connection topology.
Data Source
AI summary
This disclosure provides a touch display panel, and an electronic device. The touch display panel includes a display layer, an encapsulation layer, and a touch layer group that are sequentially disposed in a stacked manner. A plurality of touch units arranged in an array, a first metal trace, and a pad are disposed in the touch layer group in an active area, and at least one touch unit includes a first touch electrode area and a second touch electrode area. A second metal trace is disposed in at least one of the first touch electrode area and the second touch electrode area, the second metal trace is used to connect a metal mesh in a touch electrode area in which the second metal trace is located to one end of the first metal trace, and the other end of the first metal trace is connected to the pad.