Touch Display Dual-Line Mesh Electrodes for Lower Resistance
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Solution Overview
Problem
Increasing the number of touch lines in touch display devices to improve touch sensing performance leads to reduced touch electrode area, increased line resistance, and degraded sensitivity and accuracy.
Innovation Solution
A touch display device design featuring X-touch electrode lines with a double line structure and mesh type touch electrodes, connected via touch contact holes, and aligned with Y-touch electrode lines to reduce line resistance and enhance sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of touch lines is increased to improve touch sensing performance, then touch sensing capability is improved, but line resistance increases and touch sensitivity degrades
Solution Approach 1:
The patent transitions from a single-line touch electrode structure to a dual-layer touch line structure. The first touch line is formed in the first conductive layer, and the second touch line is formed in the second conductive layer above it. This dimensional change allows the touch signal to be transmitted through multiple parallel paths, reducing the effective resistance while maintaining sufficient touch electrode area for sensing performance.
Solution Approach 2:
The patent combines multiple touch lines (first touch line and second touch line) to work together in transmitting the touch signal. By merging these parallel conductive paths, the overall resistance is reduced while the combined structure maintains adequate coverage area for touch sensing, thus resolving the contradiction between resistance reduction and area preservation.
2Measurement precision
If the number of touch lines is increased to improve touch sensing performance, then touch sensing capability is improved, but the area of touch electrodes is reduced
Solution Approach 1:
The patent utilizes vertical stacking of conductive layers to accommodate multiple touch lines. The first touch line in the first conductive layer and the second touch line in the second conductive layer occupy different vertical spaces, allowing increased line capacity without horizontally encroaching on the touch electrode area, thus preserving both sensing performance and electrode area.
Solution Approach 2:
The patent implements a nested structure where the second touch line is positioned above the first touch line in a vertical arrangement. This nesting in the vertical dimension allows multiple conductive paths to coexist without overlapping in the horizontal plane, preventing reduction of the touch electrode area while providing enhanced sensing capability through multiple lines.
3Area of stationary object
If the length of touch line is increased, then coverage area is improved, but line resistance increases and sensing accuracy degrades
Solution Approach 1:
The patent merges parallel touch lines (first and second touch lines) to create multiple signal transmission paths. This merging provides redundant pathways for the touch signal, ensuring that even as lines extend to cover larger areas, the sensing accuracy is maintained through the combined signal strength and reduced effective resistance of the parallel configuration.
Data Source
AI summary
The disclosure discloses a touch display device including a plurality of X-touch electrode lines extending in a first direction and receiving a touch driving signal, a plurality of Y-touch electrode lines extending in a second direction and transmitting a touch sensing signal, a plurality of X-touch lines extending in the second direction and transmitting the touch driving signal, and a plurality of touch contact holes electrically connecting the plurality of X-touch lines and the plurality of X-touch electrode lines to a plurality of X-touch electrodes.