High Refractive Index Optical Glass Composition for VR Displays
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Solution Overview
Problem
Current high refractive index glasses used in virtual reality systems suffer from low light transmittance and reduced imaging quality due to high TiO2 content, which affects their application in fields requiring wider field of view and higher optical clarity.
Innovation Solution
An optical glass composition with specific weight percentage ranges of La2O3, Ga2O3, Nb2O5, TiO2, HfO2, Ta2O5, SiO2, BaO, and RF3, along with a controlled amount of C, is developed to achieve a high refractive index while maintaining high internal transmittance and chemical stability, utilizing a specialized preparation method involving high-temperature smelting under N2 protection and annealing to prevent crystallization and ensure glass homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high TiO2 content is used to achieve high refractive index, then refractive index is improved, but internal transmittance and imaging quality deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by introducing Nb2O5 (5-15 wt%) and HfO2 (5-15 wt%) as alternative high-refractive-index components, while strictly limiting TiO2 content to 0.1-5 wt%. This parameter substitution resolves the contradiction by achieving high refractive index (n_d≥2.0) through different chemical mechanisms that do not cause the same light absorption problems as high TiO2 content.
Solution Approach 2:
The patent creates a composite glass system combining multiple oxide components (La2O3, Ga2O3, Nb2O5, HfO2, Ta2O5, SiO2, BaO) with specific weight ratios. This composite approach allows the glass to achieve high refractive index through synergistic effects of multiple materials rather than relying on excessive TiO2, thereby maintaining high internal transmittance (T440≥93%).
2Illumination intensity
If high refractive index glass is used to expand field of view, then optical clarity is improved, but light absorption increases
Solution Approach 1:
The patent modifies the chemical composition by controlling TiO2 content to 0.1-5 wt% and introducing decoloring agents (CeO2: 0.1-5 wt%, Eu2O3: 0.01-0.5 wt%) to reduce light absorption. This allows the glass to maintain high optical clarity while minimizing energy loss through absorption, resolving the contradiction between refractive index and light transmission.
Solution Approach 2:
The patent converts the potentially harmful effect of TiO2 (which causes light absorption when present in high amounts) into a beneficial component by strictly limiting its content to 0.1-5 wt% and compensating with alternative high-refractive-index materials. This transforms the harmful light absorption effect into a controlled parameter that does not compromise optical clarity.
3Measurement precision
If high content of heavy metal oxides is used to increase refractive index, then refractive index is improved, but chemical stability deteriorates
Solution Approach 1:
The patent optimizes the weight ratios of heavy metal oxides to achieve high refractive index while maintaining chemical stability. Specifically, it uses La2O3 (20-40 wt%), Ga2O3 (15-30 wt%), and BaO (5-20 wt%) within controlled ranges, combined with network formers like SiO2 (10-30 wt%). This balanced composition ensures n_d≥2.0 while achieving water resistance stability of grade 1 or better.
Solution Approach 2:
The patent creates a composite glass system where heavy metal oxides (La2O3, Ga2O3, Nb2O5, HfO2, Ta2O5, BaO) are combined with network-forming oxides (SiO2, B2O3) and modifiers in specific proportions. This composite structure provides both high refractive index and excellent chemical stability through the synergistic effects of different material components.
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 a refractive index of 2.0 or greater, internal transmittance of 93% or more at 440 nm, and improved water resistance stability, suitable for applications in virtual reality systems, digital cameras, and vehicle displays.
Implementation Method 1
High refractive index glass belongs to the basic material of diffractive waveguide, and the relatively high refractive index thereof can make the system obtain wider field of view (FOV) and higher optical clarity
Implementation Method 2
the relatively high refractive index thereof can make the system obtain wider field of view (FOV) and higher optical clarity, and is conducive to the realization of element miniaturization and wearability at the same time... the light absorption of glass is increased and the imaging quality is reduced
Data Source
AI summary
The present application relates to the technical field of glass, in particular to an optical glass and a preparation method and application thereof. The optical glass comprises the following oxide component with the following weight percentage content, La2O3: 30%-40%; Ga2O3: 15%-25%; Nb2O5: 8%-18%; TiO2: 5%-10%; HfO2: 5%-10%; Ta2O5: 5%-10%; SiO2: 5%-10%; BaO: 2%-6%; RF3: 1%-3%, R may be one or both of La and Ga; and C: 0.005%-0.02%. The optical glass has a refractive index equal to or greater than 2.0, an internal transmittance at 440 nm equal to or greater than 93%, and a water resistance stability of grade 1, and can be used in the fields of virtual reality, digital cameras and vehicle display.