Multi-Layer Transparent Electrode for Display Light Reflection
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Solution Overview
Problem
Display devices, such as LCDs and OLEDs, face reduced contrast ratios due to external light reflection caused by screen surfaces, inner electrodes, light blocking members, or thin film transistors, especially in bright environments or outdoors.
Innovation Solution
A display device design featuring a first substrate with a pixel electrode and a second substrate with an insulating substrate, a light blocking member, and a common electrode comprising transparent conductive materials, where the common electrode includes multiple layers with matching refractive indices to minimize external light reflection through destructive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer common electrode is used, then the device structure is simple, but external light reflection is high reducing contrast ratio
Solution Approach 1:
The common electrode is divided into multiple transparent conductive layers (first common electrode layer and second common electrode layer) with different refractive indices. This segmentation allows each layer to contribute differently to light interference, achieving reduced external light reflection while maintaining electrical functionality.
Solution Approach 2:
The patent uses composite material structure by combining multiple transparent conductive materials with different refractive indices (such as ITO, IZO, AZO) in the common electrode layers. This composite approach creates optical interference that reduces external light reflection while maintaining electrical conductivity.
2Object-affected harmful factors
If multiple common electrode layers are added to reduce reflection, then external light reflection is reduced, but device complexity increases
Solution Approach 1:
The patent applies local quality by positioning specific transparent conductive materials at specific locations within the electrode structure. The first common electrode layer uses one transparent conductive material while the second layer uses another, with each material selected for its specific refractive index to optimize light interference at different depths.
Solution Approach 2:
The patent changes physical parameters by adjusting the refractive indices and thicknesses of different common electrode layers. By controlling these parameters, the optical interference pattern is optimized to reduce external light reflection across different viewing angles and lighting conditions.
3Illumination intensity
If transparent conductive materials are used in multiple layers, then optical efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses partial action by implementing two transparent conductive layers instead of requiring three or more layers for optimal anti-reflection. This provides sufficient light interference effect while keeping manufacturing complexity and precision requirements at manageable levels.
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 effectively reduces external light reflection, enhancing contrast ratios and optical efficiency while lowering energy consumption by utilizing transparent conductive materials and strategically layered structures to manage light transmission and reflection.
Implementation Method 1
the first common electrode layer and the second common electrode layer including a transparent conductive material having a refractive index matching the refractive index of the insulating substrate to minimize external light reflection
Data Source
AI summary
Provided is a display device including a first substrate including a pixel electrode provided for each pixel; and a second substrate facing the first substrate and including an insulating substrate, a light blocking member disposed along a boundary the pixel, and a common electrode disposed along the plurality of pixels; wherein the common electrode includes a first common electrode layer and a second common electrode layer, the first common electrode layer and the second common electrode layer including a transparent conductive material, wherein the first common electrode layer is disposed on one surface of the insulating substrate, wherein the light blocking member is disposed on the first common electrode layer, and wherein the second common electrode layer is disposed on the first common electrode layer and the light blocking member.