Optical Member with Dual Anti-Reflective Layers for Display Brightness
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Solution Overview
Problem
Conventional backlight units in LCDs face challenges in achieving brightness uniformity and high color reproduction, particularly with the direct-illumination type backlight units requiring increased thickness to ensure brightness uniformity, which can limit their application.
Innovation Solution
Incorporating a wavelength conversion layer with first and second anti-reflective layers to efficiently convert and direct light within the optical member, enhancing light incidence and output in both upward and downward directions, and interposing this optical member between optical sheets or the light guide plate to improve light conversion and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a direct-illumination type backlight unit is used to achieve high brightness, then brightness can be improved, but thickness increases to ensure brightness uniformity
Solution Approach 1:
The backlight unit is divided into multiple independent light sources arranged in an array, with each light source serving a specific region. This segmentation allows for localized brightness control and uniformity adjustment without increasing overall thickness, resolving the contradiction between achieving high brightness and maintaining thin profile.
2Illumination intensity
If quantum dot bar is used to convert blue light into white light, then color reproduction is improved, but light conversion efficiency is reduced due to reflection loss
Solution Approach 1:
A reflective layer is introduced as an intermediary between the quantum dot bar and the backlight unit. This reflective layer captures light that would otherwise be lost through reflection, redirects it back through the quantum dot bar for wavelength conversion, and thereby recovers energy that would have been wasted, improving overall light conversion efficiency while maintaining color reproduction 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 effectively enhances brightness and color reproduction by ensuring efficient light conversion and reflection, improving the overall performance of the display device.
Implementation Method 1
a wavelength conversion layer to convert a wavelength of an incident light
Implementation Method 2
a first anti-reflective layer on a first surface of the wavelength conversion layer; and a second anti-reflective layer under a second surface of the wavelength conversion layer
Data Source
AI summary
An optical member including a wavelength conversion layer to convert a wavelength of an incident light; an upper anti-reflective layer of at least two layers disposed on a first surface of the wavelength conversion layer; and a lower anti-reflective layer of at least two layers disposed under a second surface of the wavelength conversion layer opposite to the first surface. Further, wherein the at least two layers of the lower anti-reflective layer have different refractive indices.