Touch Sensor Wiring Layout for Narrow-Bezel Display Panels
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Solution Overview
Problem
Existing touch sensors in display devices face challenges in efficiently integrating sensor electrodes and wires while minimizing the non-active area to enhance aesthetic appeal and reduce visibility of wiring.
Innovation Solution
A display device design that includes a sensor layer with first and second wiring portions in the non-active area, each comprising multiple layers of metals with varying light reflectivity, and a light blocker to expose the active area, allowing for efficient touch input detection without increasing the non-active area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor wires are disposed in the non-active area to connect sensor electrodes, then electrical connection is achieved, but the non-active area increases reducing aesthetic appeal
Solution Approach 1:
The patent transitions from planar wiring to three-dimensional stacked wiring structures. Multiple wiring layers (first wiring layer, second wiring layer, third wiring layer) are vertically stacked and interconnected through contact holes, enabling electrical connection while occupying minimal planar area in the non-active region.
Solution Approach 2:
The patent implements nested wiring structures where smaller wiring elements are positioned within or between larger wiring layers. The first, second, and third wiring layers are nested vertically, with contact holes providing inter-layer connections, maximizing space utilization in the non-active area.
2Area of stationary object
If multiple wiring layers are used to reduce non-active area, then area efficiency improves, but device complexity increases
Solution Approach 1:
The patent divides the wiring structure into distinct functional segments: first wiring layer for primary connections, second wiring layer for intermediate connections, and third wiring layer for final connections. Each layer is separated by insulating layers and interconnected through precisely positioned contact holes, modularizing the complex wiring system.
Solution Approach 2:
The patent applies different wiring configurations to different regions: the first wiring portion extends in a first direction with multiple layers, the second wiring portion extends in a second direction with multiple layers, and the third wiring portion extends in the first direction with multiple layers. Each portion is optimized for its specific routing requirements while maintaining overall integration.
Data Source
AI summary
A display device includes a sensor layer including an active area and a non-active area at least partially surrounding the active area. A first sensor electrode is disposed in the active area of the sensor layer. A first wire is disposed in the non-active area of the sensor layer. The first wire includes a first wiring portion electrically connected to the first sensor electrode, having at least a part thereof extending in a first direction, and including at least two wiring layers, and a second wiring portion electrically connected to the first wiring portion, extending in a second direction crossing the first direction, and including a single wiring layer.