Wire Grid Polarizer and Insulating Layer for LED Display Visibility
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Solution Overview
Problem
Conventional display apparatuses using light-emitting diodes (LEDs) with organic emission materials are vulnerable to external environments and suffer from reduced visibility due to light reflection, leading to deteriorated performance.
Innovation Solution
A display apparatus design incorporating a substrate with a light-emitting diode (LED) covered by an insulating layer and a wire grid polarizer (WGP), where the WGP is in direct contact with the LED's upper surface, enhancing visibility and reliability by minimizing external light reflection and improving light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display apparatus uses a light emitting device including an organic emission material, then the display can be manufactured with current technology, but the organic emission material is vulnerable to external environment and visibility deteriorates due to light reflection
Solution Approach 1:
An insulating layer is introduced as an intermediary between the LED and the WGP. This insulating layer has a refractive index intermediate between the LED and the WGP, serving as a optical mediator that reduces reflection at the interface while maintaining electrical insulation and mechanical stability
Solution Approach 2:
The refractive index parameter of the insulating layer is specifically selected to be intermediate between the LED and WGP materials. This parameter optimization minimizes optical reflection at the interface, improving light extraction efficiency while protecting the organic emission material
2Illumination intensity
If a conventional display apparatus uses a light emitting device including an organic emission material, then the display can operate with standard components, but visibility deteriorates due to light reflected from outside
Solution Approach 1:
The insulating layer acts as an optical intermediary with intermediate refractive index, reducing Fresnel reflection at the LED-WGP interface. This allows more light to pass through, improving visibility by reducing reflected light interference
Solution Approach 2:
The wire grid polarizer, which could potentially block light, is positioned to work in conjunction with the insulating layer. The WGP converts reflected polarized light into a form that can be more easily managed, turning the harmful reflection into a controllable optical element that improves overall display performance
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 improves the visibility and reliability of the display apparatus by reducing external light reflection and enhancing light extraction, thereby maintaining performance in various environmental conditions.
Implementation Method 1
a wire grid polarizer ('WGP') provided above the insulating layer
Implementation Method 2
A light-emitting diode ('LED') is a device that converts an electric signal into a form of light
Data Source
AI summary
A display apparatus includes a substrate, a light-emitting diode (“LED”) provided above the substrate, an insulating layer provided above the LED, and a wire grid polarizer (“WGP”) provided above the insulating layer.