Pixel-Aligned Ground Micro-Wires for Flexible Touch Displays
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Solution Overview
Problem
Current touch-screen and display devices face challenges with electromagnetic interference and limited mechanical flexibility, as well as reduced visibility due to the use of traditional conductive materials that are prone to cracking and have limited transparency and conductivity.
Innovation Solution
The integration of micro-wires as ground lines between pixels and electrodes in a capacitive touch-screen display apparatus, which reduces electromagnetic interference and enhances mechanical flexibility while maintaining display visibility by using micro-wires that are partially transparent and do not obstruct light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional conductive materials are used in touch-screen displays, then electrical conductivity is achieved, but transparency is reduced and mechanical flexibility is limited due to cracking
Solution Approach 1:
The ground lines are segmented into discrete micro-wires spaced at specific intervals rather than continuous traces. This segmentation reduces the total conductive material present, improving transparency while maintaining electrical connectivity through the distributed wire array. The micro-wires are positioned in inter-pixel gaps to minimize visual impact.
Solution Approach 2:
Different regions of the display have different ground line configurations. Micro-wires are strategically placed in inter-pixel gaps where they are less visible, while maintaining adequate electrical grounding. The density and positioning of micro-wires are optimized locally to balance conductivity needs with transparency requirements.
2Object-affected harmful factors
If ground lines are added to reduce electromagnetic interference, then EMI shielding is improved, but display visibility is reduced due to obstruction of light emission
Solution Approach 1:
Continuous ground lines are divided into discrete micro-wires spaced at intervals across the display. This segmentation provides distributed EMI shielding while minimizing the total area occupied by conductive material, thereby maintaining light transmission and display visibility.
Solution Approach 2:
Ground lines are positioned in the third dimension within inter-pixel gaps and along electrode edges rather than across the entire display surface. This spatial repositioning provides EMI shielding where it is most needed while keeping the display area clear for light emission.
3Object-affected harmful factors
If continuous ground lines are used for EMI shielding, then electromagnetic interference is reduced, but mechanical flexibility is reduced due to cracking
Solution Approach 1:
Continuous ground lines are replaced with discrete micro-wires connected at intervals. This segmentation eliminates the cracking problem associated with continuous conductive layers while maintaining EMI shielding effectiveness through the distributed array of grounded micro-wires.
Solution Approach 2:
The micro-wire implementation uses thin, flexible conductive elements that can bend and flex without cracking. These micro-wires are integrated into the flexible display structure, maintaining both mechanical flexibility and electrical grounding functionality.
Data Source
AI summary
A display apparatus includes a display having an array of pixels formed in rows and columns. The rows of pixels are separated by row inter-pixel gaps and the columns of pixels separated by column inter-pixel gaps. A touch-screen includes a transparent dielectric layer having a row side and an opposed column side located over the display, the touch screen having row electrodes spaced apart by row inter-electrode gaps located on the row side of the transparent dielectric layer and column electrodes spaced apart by column inter-electrode gaps located on the column side of the transparent dielectric layer. The row and column electrodes are separated by the transparent dielectric layer. Ground lines are located on the row side between neighboring row electrodes in the row inter-electrode gaps and between the pixels in a row inter-pixel gap.