Multi-layer Opaque Masking for Display Reflection Reduction
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Solution Overview
Problem
Traditional display designs, such as liquid crystal displays, face challenges in reducing reflections from structures, which can make black portions appear lighter and hinder image visibility due to the inherent properties of black masking layers formed from resins with carbon black.
Innovation Solution
The implementation of a multi-layered structure for the opaque masking layer and color filter elements, with varying thicknesses and pigment concentrations, including a smoothly varying pigment concentration, to minimize reflections and enhance display aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a black masking layer is formed from resin with carbon black pigment, then the display can provide black color and structure definition, but reflections occur that make black portions appear lighter and reduce image visibility
Solution Approach 1:
The masking layer is divided into multiple sublayers (first sublayer and second sublayer) with different pigment concentrations and thicknesses. This segmentation allows each sublayer to contribute differently to light absorption, reducing overall reflections while maintaining black color depth.
Solution Approach 2:
Different regions of the masking layer have different properties: the first sublayer has higher pigment concentration for strong light absorption, while the second sublayer has lower pigment concentration to reduce reflections. This local quality variation optimizes both black color depth and reflection reduction in different areas of the same component.
2Reliability
If the masking layer is made opaque with high pigment concentration, then black color is achieved, but reflections increase making it difficult to see images
Solution Approach 1:
The masking layer is divided into multiple sublayers (first sublayer and second sublayer) with different pigment concentrations and thicknesses. This segmentation allows each sublayer to contribute differently to light absorption, reducing overall reflections while maintaining black color depth.
Solution Approach 2:
Different regions of the masking layer have different properties: the first sublayer has higher pigment concentration for strong light absorption, while the second sublayer has lower pigment concentration to reduce reflections. This local quality variation optimizes both black color depth and reflection reduction in different areas of the same component.
3Ease of manufacture
If a single-layer masking structure is used, then manufacturing is simple, but reflection reduction is insufficient
Solution Approach 1:
The masking layer is divided into multiple sublayers (first sublayer and second sublayer) with different pigment concentrations and thicknesses. This segmentation allows each sublayer to contribute differently to light absorption, reducing overall reflections while maintaining black color depth.
Solution Approach 2:
The masking layer uses a composite structure with two different materials or material compositions - a first material for the first sublayer and a second material for the second sublayer. This composite approach enables optimized optical properties for reflection reduction while maintaining manufacturability through standard multi-layer deposition techniques.
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
This approach effectively reduces reflections within the display, improving image clarity and visibility by optimizing the layer structure and pigment distribution, thereby minimizing unwanted light reflections and maintaining image integrity.
Implementation Method 1
The sublayers may have different thicknesses and pigment concentrations. If desired, opaque masking layer material or color filter element material may be formed that has a smoothly varying pigment concentration. Reflections may be reduced within the display by forming the opaque masking area and color filter elements from multiple sublayers.
Implementation Method 2
Reflections may be reduced within the display by forming the opaque masking area and color filter elements from multiple sublayers. The sublayers may have different thicknesses and pigment concentrations.
Data Source
AI summary
An electronic device may have a display such as a liquid crystal display. The display may have multiple layers of material such as a color filter layer and a thin-film transistor layer. An opaque masking layer may be formed on a display layer such as the color filter layer. In an inactive portion of the display, the opaque masking layer may form a rectangular ring that serves as a border region surrounding a rectangular active portion of the display. In the active portion of the display, the opaque masking layer may be patterned to from an opaque matrix that separates color filter elements in an array of color filter elements. The opaque masking layer and color filter elements may be formed from polymers such as photoresist. The opaque masking layer may include a black pigment such as carbon black. Color filter elements and opaque masking material may include multiple sublayers.