Light Guide Plate Index Matching Layer Refractive Index Control
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Solution Overview
Problem
Existing edge-lit type backlight modules suffer from color shift and insufficient structural strength, affecting illumination and display quality due to inadequate refractive index matching and thickness of the index matching layer in the light guide plate.
Innovation Solution
A light guide plate with an index matching layer having a refractive index between 1.07*n2 and 1.7*n2, and a thickness greater than 500 nm, which enhances total internal reflection and structural strength by modulating the refractive index difference between the light guide main body and the index matching layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the index matching layer is made thinner to reduce color shift, then illumination quality improves, but structural strength deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive index ratio (1.07*n2≤n1≤1.7*n2) and thickness (≥500nm) of the index matching layer to optimize both total internal reflection efficiency and structural strength simultaneously
Solution Approach 2:
The patent uses composite material structure combining the light guide main body with the index matching layer having specific refractive index properties to achieve both optical performance and mechanical strength
2Illumination intensity
If the refractive index difference is increased to enhance total internal reflection, then illumination quality improves, but color shift increases
Solution Approach 1:
The patent optimizes the refractive index difference parameter within the range 0.1≤(n1−n2)≤0.7 to balance total internal reflection efficiency and color shift prevention
Solution Approach 2:
The patent uses the index matching layer as an intermediary to copy and transmit light while maintaining specific refractive index relationships that prevent color shift
3Strength
If the index matching layer thickness is increased to improve structural strength, then structural strength improves, but total internal reflection efficiency deteriorates
Solution Approach 1:
The patent establishes the thickness parameter range ≥500nm combined with specific refractive index ratios to achieve the optimal balance between structural strength and total internal reflection efficiency
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 improves illumination quality by maintaining total internal reflection and structural strength, reducing color shift and enhancing display quality in the backlight module and display apparatus.
Implementation Method 1
the refractive index difference between the light guide main body and the index matching layer cooperates with the thickness of the index matching layer to help generation of total internal reflection
Data Source
AI summary
A light guide plate including a light guide main body and an index matching layer is provided. The light guide main body has a light-emitting surface and a bottom surface opposite to the light-emitting surface. The index matching layer is disposed adjacent to the bottom surface, wherein a refractive index of the light guide main body is n1, and a refractive index of the index matching layer is n2. 1.07*n2≤n1≤1.7*n2, and 0.1≤(n1−n2)≤0.7. A thickness of the index matching layer is larger than 500 nm. A backlight module and a display apparatus are also provided.