Touch Display Panel Layer Stacking for Reduced Light Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In existing touch display panels, the use of metal materials for touch electrodes and leads can affect the display effect by causing light shielding and visible patterns, and there is a risk of short circuits due to overlapping metal layers.
Innovation Solution
A touch display panel design with a substrate, a touch layer comprising a first metal layer, an insulation layer, and a second metal layer, where touch electrodes and leads are strategically positioned to minimize overlap and reduce the risk of short circuits, with the first wiring portion of the touch lead located in the first metal layer and the first electrode line in the second metal layer, allowing partial overlap perpendicular to the substrate plane to reduce light shielding and visible patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal materials are used to make touch electrodes and touch leads to improve conductivity and reduce production cost, then conductivity is improved and production cost is reduced, but display effect deteriorates due to light shielding and visible patterns
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional stacked arrangement of metal layers. The first metal layer and second metal layer are stacked vertically with an insulation layer in between, allowing touch leads and electrode lines to overlap in the vertical dimension while maintaining electrical insulation. This resolves the conflict between conductivity (achieved through metal overlap) and display effect (maintained by preventing visible patterns through proper layer stacking).
Solution Approach 2:
The insulation layer serves as an intermediary between the first metal layer and second metal layer. It enables the touch lead in the first metal layer to overlap with the electrode line in the second metal layer while preventing electrical short circuits. This mediator allows the system to achieve both good conductivity through metal overlap and reliable electrical insulation through the dielectric layer.
2Object-affected harmful factors
If touch leads and electrode lines are arranged to overlap to reduce light shielding and visible patterns, then display effect is improved, but risk of short circuits increases
Solution Approach 1:
The patent utilizes the vertical dimension to separate conductive elements that overlap in the planar view. By stacking the first metal layer and second metal layer vertically with an insulation layer between them, the design allows maximum overlap in the horizontal plane (reducing visible patterns) while maintaining safe electrical separation in the vertical direction (preventing short circuits).
Solution Approach 2:
The insulation layer acts as a protective intermediary between the overlapping metal layers. It provides electrical isolation that prevents short circuits while allowing the metal layers to overlap sufficiently to minimize display artifacts. The insulation layer is positioned exactly where needed to prevent harmful electrical contact while being transparent to the desired overlapping arrangement.
3Reliability
If touch leads are positioned to minimize overlap with electrode lines, then short circuit risk is reduced, but light shielding and visible patterns increase affecting display effect
Solution Approach 1:
The patent resolves this contradiction by moving the separation strategy from the horizontal plane to the vertical dimension. Instead of minimizing overlap in the plane (which would cause visible patterns), the design allows horizontal overlap but separates the metal layers vertically using stacked layers with insulation. This enables both reliability (through vertical separation) and display quality (through horizontal overlap).
Solution Approach 2:
The patent merges the functions of multiple layers into a compact stacked structure. The first metal layer, insulation layer, and second metal layer are combined in a vertical stack, allowing the touch lead and electrode line to occupy the same horizontal space while maintaining electrical separation. This merging approach efficiently addresses both short circuit prevention and display effect improvement simultaneously.
Data Source
AI summary
A touch display panel and a display device are provided. The touch display panel includes a substrate, and a touch layer located on a side of the substrate. The touch layer comprises a first metal layer, an insulation layer, and a second metal layer stacked in sequence. The touch display panel also includes a plurality of touch electrodes located in the second metal layer. A touch electrode of the plurality of touch electrodes comprises a first electrode line extending along a first direction and a second electrode line extending along the second direction, and the first direction intersects the second direction. The touch display panel also includes a plurality of touch leads. The touch electrode is electrically connected to a corresponding touch lead of the plurality of touch leads. The touch lead comprises a first wiring portion extending along the first direction.