Touch Panel Mesh Electrode Layout for Splicing Exposure Alignment
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Solution Overview
Problem
The alignment deviation in splicing exposure processes during the production of large-sized display or touch panels results in inconsistent line widths, leading to mura phenomena and potential open circuits or ghost images due to the limitations of existing masks and exposure machines.
Innovation Solution
A mask design with varying light-shielding strip widths and configurations is employed to compensate for positional deviations, ensuring consistent line widths across splicing and normal exposure regions, thereby alleviating mura and maintaining appropriate line sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional mask with uniform light-shielding strip width is used in splicing exposure process, then the exposure process can be completed, but the line widths become inconsistent and mura phenomena occur
Solution Approach 1:
The patent applies local quality by making the light-shielding strip width vary in different regions of the mask. Specifically, the mask includes a first region with a first light-shielding strip width and a second region with a second light-shielding strip width, where the widths are different. This local variation compensates for alignment deviations in the splicing exposure process, ensuring consistent line widths in the final pattern and eliminating mura phenomena.
Solution Approach 2:
The patent changes the geometric parameter (width) of the light-shielding strips based on their position in the mask. The first light-shielding strip has a first width and the second light-shielding strip has a second width, which are deliberately different to compensate for expected alignment deviations during splicing exposure. This parameter change approach directly addresses the line width inconsistency problem.
2Reliability
If the mask does not account for alignment deviation, then the mask structure remains simple, but open circuits and ghost images occur
Solution Approach 1:
The mask structure is made locally different to account for alignment deviations. The first region has light-shielding strips with a first width while the second region has light-shielding strips with a second width. This local structural variation ensures that even when alignment deviation occurs during splicing exposure, the resulting patterns maintain appropriate line widths, preventing open circuits and ghost images while improving circuit reliability.
3Ease of manufacture
If uniform light-shielding strip width is used, then the mask manufacturing is simple, but splicing exposure quality deteriorates
Solution Approach 1:
The patent implements local quality by creating regions with different light-shielding strip widths. The first region contains strips with a first width optimized for that area, while the second region contains strips with a second width. This approach maintains manufacturing feasibility while significantly improving splicing exposure quality and line width consistency in the final pattern.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The mask design ensures uniform line widths, preventing open circuits and ghost images, enhancing splicing exposure quality and yield in large-sized display and touch panels.
Implementation Method 1
the first light-shielding strip, the second light-shielding strip and the third light-shielding strip are configured to shield light and bound spaces, and the spaces are configured in such a manner that light is allowed to pass through the spaces
Data Source
AI summary
A touch panel includes a substrate, a touch driving electrode disposed on the substrate, and a touch sensing electrode disposed on the substrate, at least one of the touch driving electrode and the touch sensing electrode has a metal mesh-like structure including nodes, each node includes a first protruding structure and a second protruding structure distributed on both sides of a mesh bar, and the first protruding structure and the second protruding structure are arranged in a staggered manner along an extension direction of the mesh bar. The mesh-like structure includes a first mesh bar and a second mesh bar directly connected to both ends of the node respectively, and a center line of the first mesh bar does not coincide with a center line of the second mesh bar.