Optical Glass Composition for Thin Light Guide Plates
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Solution Overview
Problem
Current optical glasses used in light guide plates for head-mounted displays have insufficient light transmittance, particularly in the blue wavelength range, which limits their performance in augmented, virtual, and mixed reality applications.
Innovation Solution
An optical glass composition comprising SiO2, B2O3, La2O3, TiO2, and optional components like Y2O3, WO3, Nb2O5, ZrO2, and Gd2O3, optimized to achieve a high refractive index and high light transmittance, with specific ranges for each component to enhance strength, refractive index, and devitrification temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a high refractive index glass is used for light guide plate, then the thickness can be reduced and design flexibility is improved, but the light transmittance becomes insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the glass by precisely controlling the content ranges of specific oxides (SiO2: 9.0-11.0%, B2O3: 22.0-24.0%, La2O3: 18.0-20.0%, TiO2: 30.0-31.0%). This parameter optimization allows the glass to simultaneously achieve high refractive index (enabling thinner light guide plates) and high light transmittance (particularly in blue wavelength range), resolving the contradiction between thickness reduction and transmittance maintenance
Solution Approach 2:
The patent creates a composite glass material by combining multiple oxide components in specific proportions. The synergistic effect of SiO2, B2O3, La2O3, and TiO2 produces a glass composition that achieves both high refractive index and high transmittance properties, overcoming the limitations of conventional single-component or simpler composite glass formulations
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 glass achieves high refractive index and light transmittance, enabling the design of thinner light guide plates with improved blue light transmission and reduced devitrification, suitable for continuous industrial production.
Implementation Method 1
TiO 2 is a component that, typically, increases the refractive index of glass
Implementation Method 2
an optical glass having a high refractive index and high light transmittance has been desired
Data Source
AI summary
Provided is an optical glass having a high refractive index and high light transmittance. The optical glass contains, in terms of mol% based on oxides, SiO2: 9.0% to 11.0%, B2O3: 22.0% to 24.0%, La2O3: 18.0% to 20.0%, and TiO2: 30.0% to 31.0%.