Flexible Touch Display Panel Metal Grid Electrode Hiding
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Solution Overview
Problem
Current touch screen technologies face challenges in achieving a foldable function due to manufacturing process limitations and high costs, making it difficult to create flexible touch screens that are both functional and cost-effective for mobile and wearable devices.
Innovation Solution
A flexible touch display panel design featuring a flexible display substrate with a color film layer, metal grid electrode pattern, and strip bridge electrode pattern, where the light shielding layer covers the orthographic projections of these electrodes, enabling a grid-like pattern for touch functionality while utilizing the ductility of metal for foldability and reducing visibility of metal traces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible touch display panel uses metal grid electrodes for touch functionality, then touch sensitivity and functionality are improved, but metal traces become visible on the display surface affecting display quality
Solution Approach 1:
The patent moves the metal grid electrodes from the front display surface to the rear surface of the flexible substrate. The light shielding layer is positioned between the color filter blocks to cover the orthographic projections of the metal grid electrodes, effectively hiding them from the front view while preserving touch functionality. This spatial repositioning resolves the conflict between touch sensitivity and display brightness.
2Illumination intensity
If the light shielding layer completely covers the metal grid electrodes, then visibility of metal traces is reduced, but touch sensitivity may be compromised
Solution Approach 1:
The light shielding layer is strategically positioned only between adjacent color filter blocks, covering the orthographic projections of the metal grid electrodes where they would be visible, while leaving the color filter blocks themselves exposed. This localized shielding approach maintains display brightness in the active areas while hiding metal traces in the interstitial regions, without compromising touch sensitivity.
3Ease of manufacture
If conventional touch screen manufacturing processes are used, then manufacturing simplicity is maintained, but foldable function cannot be achieved
Solution Approach 1:
The patent employs a flexible substrate as the base for the touch display panel, replacing conventional rigid substrates. The entire structure including the color filter layer, light shielding layer, and metal grid electrodes is constructed on this flexible foundation, enabling the panel to be folded without breaking. This maintains compatibility with standard manufacturing processes while achieving the foldable function.
Data Source
AI summary
A flexible touch display panel includes a flexible display substrate, and a color film layer disposed above the flexible display substrate. The color film layer includes a plurality of color filter blocks spaced apart, and a light shielding layer disposed between adjacent ones of the color filter blocks. The flexible touch display panel further includes a first electrode pattern and a second electrode pattern on both sides of the light shielding layer. An orthographic projection of the light shielding layer on the flexible display substrate covers orthographic projections of the first electrode patterns and the second electrode patterns on the flexible display substrate. The first electrode pattern is electrically connected with the second electrode pattern a via hole provided on the light shielding layer.