Low Reflectance Display Substrate Using Composite Resin Electrodes
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Solution Overview
Problem
Existing display device substrates face challenges in achieving high light shielding properties and low reflectance, particularly in high-definition displays, where the use of metals like aluminum and chromium results in high reflectance, environmental concerns, and complexity in electrode configurations, leading to decreased display quality and visibility issues under bright light conditions.
Innovation Solution
A display device substrate with a low reflectance electrode configuration, comprising a first light absorption resin layer, a metal film with alkali tolerance, and a second light absorption resin layer, using a copper alloy with specific alloying elements and a black colorant, which provides both low reflectance and effective light shielding, improving visibility and touch sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a black resin with high carbon content is used to achieve high light shielding properties, then optical density is improved, but reflectance increases
Solution Approach 1:
The patent uses a composite material consisting of a black resin containing carbon particles combined with a transparent resin. This composite structure allows the carbon particles to provide light shielding (absorption) while the transparent resin matrix reduces overall reflectance compared to pure carbon-based black resin. The composite approach enables achieving both high optical density and low reflectance by optimizing the distribution and concentration of carbon particles within the transparent resin matrix.
2Length of moving object
If the black matrix thickness is reduced to achieve high-definition display, then pixel width is improved, but light shielding properties deteriorate
Solution Approach 1:
The patent changes the optical parameters of the black matrix material by incorporating carbon particles with specific size distributions (0.1-10 μm) and concentrations into the resin matrix. This parameter optimization allows the black matrix to achieve sufficient light shielding properties at reduced thickness (4 μm or less), enabling high-definition displays with narrow pixel widths while maintaining adequate light blocking performance.
3Reliability
If metal films like aluminum or chromium are used for electrodes, then conductivity is improved, but reflectance increases and environmental issues arise
Solution Approach 1:
The patent applies local quality by using transparent conductive oxide films (such as ITO, IZO, or IFO) specifically in regions where low reflectance is critical, while maintaining adequate conductivity for electrode functions. This localized material selection allows the electrode to perform its electrical function while minimizing unwanted light reflection that would degrade display quality, particularly in high-definition displays where pixel structures are closely spaced.
4Adaptability or versatility
If complex multi-layer electrode configurations are used to achieve touch sensing function, then touch detection capability is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing the transparent conductive oxide film to serve dual purposes: as an electrode for touch sensing operations and as a low-reflectance layer to improve display visibility. This unified structure eliminates the need for separate transparent electrode layers and anti-reflective coatings, thereby reducing overall device complexity while maintaining both touch detection capability and display quality.
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 solution significantly enhances transmittance and reduces noise interference, allowing for accurate finger location detection and improved display quality by minimizing reflectance and maximizing light shielding, while being environmentally friendly and cost-effective.
Implementation Method 1
a first light absorption resin layer, a metal film having alkali resistance, and a second light absorption resin layer which are laminated on the display portion in this order
Data Source
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AI summary
A display device substrate (12) is provided with: a transparent substrate (10) having a display portion formed in an overall rectangular shape in planar view; a low reflectance electrode (4) provided in the display portion, having a plurality of pixel openings and a plurality of partial patterns parallel with respect to a first direction along the transparent substrate and being mutually and electrically isolated; a first transparent resin layer (5) laminated on the low reflectance electrode; a transparent electrode (6) laminated on the first transparent resin layer, having a plurality of partial patterns being in parallel with respect to a second direction perpendicular to the first direction and being along the transparent substrate; and a second transparent resin layer (7) laminated on the partial patterns of the transparent electrode.