Multi-Layer Cermet Light Blocking Member for Displays
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Solution Overview
Problem
Conventional light blocking members for display devices, such as those using chromium, can increase parasitic capacitance and are not environmentally friendly, while also reflecting external light, which deteriorates display performance and requires additional components like polarizing plates, increasing costs.
Innovation Solution
A light blocking member comprising multiple layers with varying concentrations of molybdenum and niobium oxide, where the first layer has higher optical transmittance and is closer to the external light source, and the second layer with higher metal particle concentration enhances light scattering and absorption, reducing reflection and parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional light blocking member (e.g., chromium) is used, then light blocking function is provided, but parasitic capacitance increases and environmental friendliness deteriorates
Solution Approach 1:
The patent uses a composite material consisting of metal particles (molybdenum, tungsten, or tungsten alloy) dispersed in a ceramic matrix (silicon oxide, silicon nitride, or silicon oxynitride). This cermet structure provides effective light blocking while maintaining high resistance to prevent parasitic capacitance, replacing conventional chromium-based materials.
Solution Approach 2:
The patent creates layers with different metal particle concentrations - a first layer with lower concentration (2-8 vol%) and a second layer with higher concentration (15-45 vol%). This gradient structure optimizes both light blocking performance and electrical resistance properties at different depths of the light blocking member.
2Ease of manufacture
If a single-layer light blocking structure is used, then manufacturing is simple, but light reflection control is insufficient
Solution Approach 1:
The light blocking member is divided into multiple layers with different metal particle concentrations. The first layer has lower concentration for initial light filtering, while the second layer has higher concentration for enhanced light blocking. This segmentation achieves superior light reflection control compared to single-layer structures.
Solution Approach 2:
The patent varies the metal particle concentration parameter across different layers - from 2-8 vol% in the first layer to 15-45 vol% in the second layer. This parameter gradient optimizes light blocking performance while maintaining manufacturing feasibility through controlled deposition processes.
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 multi-layer light blocking member effectively decreases external light reflection, maintains high resistance to prevent parasitic capacitance, and eliminates the need for separate polarizing plates, thereby improving display performance and reducing costs.
Implementation Method 1
the cermet layer on the viewer side of the light absorbing member has a lower concentration of metal particles... than the cermet layer on the far side relative to the viewer, which has a metal particle concentration between 15 and 45 vol%
Implementation Method 2
the second layer with higher metal particle concentration enhances light scattering and absorption, reducing reflection
Data Source
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AI summary
A light blocking member (280) including a metal particle (260) and a ceramic material (270) and a display device including the same.