Conductive Substrate Blackened Layer Color Optimization
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Solution Overview
Problem
Conductive substrates used in liquid crystal touch panels become visually conspicuous when the backlight is turned off due to a large color difference between the image display surface and the blackened layer, which affects the visibility and performance of the panel.
Innovation Solution
A conductive substrate with a transparent base material, a metal layer, and a blackened layer is designed, where the blackened layer's color is optimized in the CIE (L*a*b*) color space to ensure its b* value falls within a specific range relative to the panel's color, making the wiring inconspicuous even when the backlight is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal foil made of copper or the like is used instead of an ITO film, then electrical resistance is reduced and signal degradation is prevented, but visibility of the liquid display panel is degraded due to light reflection from metallic luster
Solution Approach 1:
An organic compound layer is introduced as an intermediary between the metal foil and the external environment. This layer absorbs excess light and reduces metallic luster, preventing direct light reflection while allowing the metal foil to maintain its electrical conductivity function.
Solution Approach 2:
The organic compound layer modifies the optical appearance of the metal foil by changing its color characteristics. The layer reduces the bright metallic luster and controls light reflection, making the conductive substrate less visually conspicuous while maintaining electrical performance.
2Object-affected harmful factors
If ITO film is used as transparent conductive film, then visibility is maintained with low reflectance, but electrical resistance is high and signal degradation occurs in large panels
Solution Approach 1:
The invention replaces expensive ITO material with a more cost-effective metal foil solution. While ITO provides good optical properties, the metal foil combined with organic compound achieves similar or better performance at lower cost, making it suitable for large-scale production of large panels.
Solution Approach 2:
The metal foil is combined with an organic compound layer to create a composite conductive substrate that overcomes the limitations of pure metal foil. This composite structure provides both the low electrical resistance of metal and the optical control properties needed for display applications.
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 optimized blackened layer effectively reduces the visibility of the wiring, enhancing the overall performance and aesthetics of the liquid crystal touch panel by controlling light reflection and maintaining low average reflectance, ensuring the wiring remains inconspicuous during backlight-off conditions.
Implementation Method 1
a blackened layer made of an organic compound... which absorbs light and makes it difficult for light to be reflected by the metal layer
Implementation Method 2
because a metal foil made of copper or the like has metallic luster, visibility of the liquid display panel may be degraded due to light reflection
Data Source
AI summary
A conductive substrate is provided that is arranged on an image display surface of a liquid crystal panel. The conductive substrate includes a transparent base material, a metal layer formed on at least one surface of the transparent base material, and a blackened layer formed on at least one surface of the transparent base material. Provided the color of the image display surface of the liquid crystal panel during backlight-off time, when converted into the CIE (L*a*b*) color space, has a b* value denoted as “b*panel”, the color of the blackened layer, when converted into the CIE (L*a*b*) color space, has a b* value that satisfies the following Formula 1:(b*panel+1)≥b*≥(b*panel−3.5) Formula 1.