Integrated Optical Member for LCD Backlight Efficiency
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Solution Overview
Problem
Current liquid crystal display (LCD) backlight units face limitations in light efficiency and thickness due to the need for separate substrates for optical conversion members, leading to decreased reflection efficiency and increased thickness, as well as re-absorption of recycled light, which affects color reproduction accuracy and overall display performance.
Innovation Solution
An optical member with an integrally-formed barrier substrate, optical conversion layer, and reflective substrate enhances reflection efficiency, functions as both a reflective plate and optical conversion member, and is positioned under the light guide plate or on the light source unit to prevent re-absorption, thereby improving light efficiency and color reproduction accuracy while reducing thickness and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If separate substrates are used for optical conversion member, then optical conversion function is achieved, but thickness increases
Solution Approach 1:
The patent merges the reflective plate and optical conversion member into a single integrated component. The reflective substrate serves dual functions as both a reflective element and an optical conversion member, eliminating the need for separate substrates and reducing overall thickness while maintaining optical conversion capability
Solution Approach 2:
The reflective substrate is designed to perform multiple functions simultaneously: reflection, optical conversion, and structural support. This multi-functional design reduces the number of components needed and decreases thickness without compromising optical performance
2Loss of energy
If optical conversion member is disposed on light guide plate, then optical conversion is achieved, but light efficiency decreases due to re-absorption
Solution Approach 1:
The patent inverts the conventional arrangement by placing the optical conversion member on the light source unit rather than on the light guide plate. This inversion prevents recycled light from being re-absorbed by the optical conversion member, thereby improving light efficiency while maintaining color reproduction accuracy
Solution Approach 2:
The patent introduces a barrier substrate as an intermediary layer between the optical conversion member and the light guide plate. This barrier substrate prevents harmful interactions and re-absorption of recycled light while allowing optimal light transmission, thus improving overall light efficiency
3Loss of energy
If reflective plate and optical conversion member are separate, then optical conversion function is achieved, but reflection efficiency decreases
Solution Approach 1:
The patent combines the reflective plate and optical conversion member into a single integrated reflective substrate. This merging ensures that light reflecting off the substrate passes through the optical conversion layer without being re-absorbed, maintaining high reflection efficiency while reducing component count
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 enhances light efficiency, color reproduction accuracy, and simplifies the structure by integrating functions, reducing thickness and manufacturing costs, while preventing light re-absorption and improving reflection efficiency across all wavelength bands.
Implementation Method 1
the optical conversion layer may convert the wavelength of incident light and emit converted light
Implementation Method 2
a reflective substrate including a base member, a reflective layer disposed on the base member, and a plurality of refractive layers disposed on the reflective layer
Data Source
AI summary
An optical member, backlight unit and display device are provided. The optical member includes: a reflective substrate including a base member, a reflective layer disposed on the base member, and a plurality of refractive layers disposed on the reflective layer; an optical conversion layer disposed on the reflective substrate; and a barrier substrate disposed on the optical conversion layer.