Multi-Layer Touch Routing Lines for Bezel Area Reduction
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Solution Overview
Problem
In touch display apparatuses, the increase in the number of touch routing lines reduces the display area due to the corresponding increase in the bezel area, affecting the accuracy and reliability of touch sensing.
Innovation Solution
The touch display apparatus incorporates a touch sensor with touch electrodes and pads on a device substrate, where the touch routing lines are divided into two layers, with the second routing lines being insulated from the first routing lines and positioned on a different layer, allowing for reduced bezel area occupation while maintaining touch sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of touch routing lines is increased to improve touch sensing accuracy, then the reliability of touch sensing is improved, but the bezel area increases and the display area is reduced
Solution Approach 1:
The patent applies dimensionality change by transitioning from a single-layer routing structure to a multi-layer routing structure. Touch routing lines are distributed across multiple layers (first routing lines on a first layer, second routing lines on a second layer), allowing vertical stacking of conductive paths. This three-dimensional arrangement reduces the horizontal space required for routing lines, thereby minimizing bezel area expansion while maintaining sufficient routing capacity for accurate touch sensing.
Solution Approach 2:
The routing system is segmented into multiple independent layers, with each layer containing a subset of routing lines. This segmentation allows parallel processing of multiple touch electrode signals across different layers, improving touch sensing reliability through redundant pathways while reducing the area occupied by any single routing line.
2Reliability
If the number of touch routing lines is increased to improve touch sensing accuracy, then the reliability of touch sensing is improved, but the area occupied by routing lines increases
Solution Approach 1:
The patent utilizes vertical layering to accommodate multiple routing lines in a compact footprint. By stacking routing lines across different layers (with insulating layers between them), the system increases the effective routing capacity without proportionally increasing the planar area occupied by the routing structure.
3Measurement precision
If more touch routing lines are used to enhance touch sensing accuracy, then the reliability of touch sensing is improved, but the bezel area increases
Solution Approach 1:
The multi-layer routing architecture enables multiple touch sensing signals to be transmitted through vertically stacked routing lines, maintaining high touch sensing accuracy through sufficient signal pathways while confining the routing structure within a compact horizontal footprint, thus minimizing bezel area expansion.
Solution Approach 2:
Multiple routing functions are merged into a compact multi-layer structure where routing lines, insulating layers, and touch electrodes are integrated in a stacked configuration. This consolidation achieves high measurement precision through multiple signal paths while minimizing the overall bezel area by combining what would otherwise be separate horizontal elements into a vertical stack.
Data Source
AI summary
A touch display apparatus is provided. The touch display apparatus may include a touch sensor on an encapsulating layer that covers light-emitting devices. The touch sensor may include touch electrodes and bridge electrodes electrically connecting between the touch electrodes. Each of the touch electrodes may be electrically connected to a corresponding touch pad by one touch routing line from touch routing lines. The touch routing lines may include first routing lines and second routing lines disposed on a different layer from the first routing lines. Thus, in the touch display apparatus, an area occupied by the touch routing lines may be reduced.