Touch Wiring Lines with Hollow Patterns for Narrow Bezel Displays
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Solution Overview
Problem
Capacitance type touch screens in existing technologies face challenges in meeting design requirements for narrow-bezel products due to the visual visibility of touch wiring lines, which necessitate a larger border region and the use of cover plates to prevent exposure.
Innovation Solution
A touch control substrate with touch wiring lines featuring hollowed patterns defined by metal lines, allowing for a narrower line width and reduced area occupation, combined with an insulation layer and touch control layer to ensure visual invisibility and functionality, is introduced. This substrate includes a base with a metal mesh structure and transparent conductive layers, enabling conductivity and touch control without the need for a cover plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If solid touch wiring lines are used, then conductivity and structural integrity are ensured, but the wiring lines occupy large area and remain visually visible
Solution Approach 1:
The touch wiring lines are designed with hollow patterns (circles, triangles, or quadrilaterals) distributed along the wiring path, creating a porous structure that reduces the overall area occupied by the wiring while maintaining electrical conductivity through the remaining metal material. This porous design allows the wiring to be less visually prominent while still functioning effectively.
Solution Approach 2:
The touch control substrate employs a composite structure combining metal wiring lines with transparent conductive layers (such as ITO) and insulation layers. This composite material approach allows the metal wiring to provide structural support and conductivity while the transparent conductive layers enhance electrical performance and the insulation layers prevent short circuits, collectively reducing the need for wide metal wiring lines.
2Reliability
If wider touch wiring lines are used, then conductivity is improved, but visual visibility increases requiring cover plates
Solution Approach 1:
By introducing hollow patterns into the wiring line structure, the patent achieves high conductivity with reduced material usage and smaller line width. The hollow patterns are strategically distributed to maintain electrical performance while reducing the overall visual footprint, eliminating the need for additional cover plates to hide visible wiring.
Solution Approach 2:
The patent changes the structural parameters of the wiring lines from solid to hollow patterns, and optimizes the dimensions (line width, spacing, and pattern size) to achieve the right balance between conductivity and visual invisibility. This parameter optimization allows the wiring to function effectively at smaller sizes without requiring additional protective or cosmetic components.
3Area of stationary object
If hollowed patterns are introduced in touch wiring lines, then area occupation is reduced and visual visibility is decreased, but manufacturing complexity increases
Solution Approach 1:
The hollow patterns are created by segmenting the solid wiring line into multiple sections with hollow spaces. This segmentation is achieved through standard photomask patterning processes where the hollow patterns are defined as part of the wiring line layout, allowing conventional manufacturing equipment to produce the complex patterns without requiring additional manufacturing steps.
Data Source
AI summary
Embodiments of the present disclosure provide a touch control substrate, a method for manufacturing the same and a display device. The touch control substrate includes a base and touch wiring lines on the base. The touch wiring line includes a plurality of hollowed patterns defined by a plurality of metal lines.