Laminated Optical Member for Liquid Crystal Display
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Solution Overview
Problem
Existing liquid crystal displays face challenges with wavelength conversion films, including vulnerability of wavelength conversion particles to moisture, the need for expensive barrier films, and complex assembly processes.
Innovation Solution
An optical member with a laminated structure, comprising a light guide plate, a wavelength conversion underlying layer, a wavelength conversion layer, and a wavelength conversion overlying layer, which improves light transmission efficiency and reduces thickness and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier film is used to protect wavelength conversion particles from moisture, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the wavelength conversion layer and barrier function into a single integrated structure. The wavelength conversion layer itself is designed to provide moisture protection, eliminating the need for a separate barrier film while maintaining both optical conversion and protective functions.
Solution Approach 2:
The wavelength conversion layer is given multiple functions: it converts light wavelength and simultaneously provides moisture barrier protection. This multi-functional design replaces what would traditionally require separate components, reducing overall device complexity.
2Reliability
If a barrier film is used to protect wavelength conversion particles, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the wavelength conversion layer and barrier function into a single integrated structure. The wavelength conversion layer itself is designed to provide moisture protection, eliminating the need for a separate barrier film while maintaining both optical conversion and protective functions.
Solution Approach 2:
The invention uses a cost-effective approach by eliminating expensive barrier films and relying on the wavelength conversion layer's inherent properties to provide sufficient moisture protection, thereby reducing material costs.
3Reliability
If a wavelength conversion film is laminated on the light guide plate, then wavelength conversion function is improved, but device complexity increases
Solution Approach 1:
The patent merges the wavelength conversion layer directly with the light guide plate structure, eliminating the need for separate lamination of a wavelength conversion film. This integration simplifies the assembly process while maintaining effective wavelength conversion functionality.
Solution Approach 2:
The invention divides the optical system into functional zones within the light guide plate itself, with the wavelength conversion layer positioned at specific locations (edges or surfaces) where it can efficiently convert light without requiring separate film lamination.
4Reliability
If traditional wavelength conversion structure is used, then wavelength conversion is achieved, but light transmission efficiency is reduced
Solution Approach 1:
The patent positions the wavelength conversion layer to convert light wavelengths before the light travels through the main optical path. By performing wavelength conversion in advance at the light guide plate level, the system minimizes energy loss during transmission through the display stack.
Solution Approach 2:
The wavelength conversion layer is positioned at specific locations (edges or particular surfaces) of the light guide plate where it can convert light locally before it enters the main optical path, optimizing light transmission efficiency by converting wavelengths at the most effective point in the optical path.
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 optical member enhances light transmission efficiency and reduces the thickness and manufacturing costs of liquid crystal displays, while also protecting wavelength conversion particles from moisture without the need for expensive barrier films.
Implementation Method 1
a wavelength conversion layer (50) disposed on the wavelength conversion underlying layer (70), the wavelength conversion layer (50) including wavelength conversion particles
Implementation Method 2
an optical member having a laminated structure and a display device including the same are capable of providing improved light transmission efficiency
Data Source
Figure 1
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Figure 4~5A
AI summary
An optical member including a light guide plate, a low refractive layer disposed on the light guide plate and having a refractive index less than that of the light guide plate, a low refractive underlying layer disposed between the low refractive layer and the light guide plate and having a thickness less than that of the low refractive layer, and a wavelength conversion layer disposed on the low refractive layer.