Borosilicate Glass Light-Guiding Plate for Slim LCD
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Solution Overview
Problem
Conventional liquid crystal display (LCD) light-guiding plates made of polymer materials like PMMA suffer from high temperature instability, generation of harmful volatile organic compounds, high coefficient of thermal expansion, and low mechanical rigidity, limiting the slim profile and optical performance of LCDs.
Innovation Solution
A glass light-guiding plate composed of borosilicate glass with a specific composition (75-85 wt% SiO2, 5-20 wt% B2O3, 1-5 wt% Al2O3, 3-8 wt% R2O, and Fe2O3<0.0025 wt%) that provides high-temperature stability, low thermal expansion, and enhanced mechanical rigidity, allowing for a thinner and more robust display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer materials (PMMA, PC) are used for the light-guiding plate, then ease of manufacture is improved, but high-temperature stability deteriorates and harmful volatile organic compounds are generated
Solution Approach 1:
The patent changes the material parameter from polymer to glass, specifically using borosilicate glass composition (70-85 wt% SiO2, 5-20 wt% B2O3, 1-10 wt% Al2O3, 2-8 wt% R2O) to achieve high-temperature stability while maintaining manufacturability through established glass forming processes
Solution Approach 2:
The patent uses borosilicate glass as a composite material system combining multiple oxide components (SiO2, B2O3, Al2O3, R2O) to achieve synergistic properties including high-temperature stability, low thermal expansion coefficient (3-8×10^-6/K), and appropriate refractive index (1.45-1.55) for light guiding functionality
2Ease of manufacture
If polymer materials are used for the light-guiding plate, then ease of manufacture is improved, but mechanical rigidity deteriorates requiring additional metallic frame support
Solution Approach 1:
The patent changes the material from polymer to glass, achieving high mechanical rigidity inherent to glass materials, which eliminates the need for additional metallic frame support structures while maintaining ease of manufacture through direct glass forming processes
3Illumination intensity
If PMMA is used for the light-guiding plate with sufficient thickness for optical characteristics, then optical performance is improved, but the slim profile of the display device is limited
Solution Approach 1:
The patent changes the material parameter from PMMA to glass with optimized composition, achieving high light transmittance and appropriate refractive index (1.45-1.55) that enables effective light guiding at reduced thickness, thus achieving both optical performance and slim profile
4Ease of manufacture
If polymer materials are used for the light-guiding plate, then ease of manufacture is improved, but coefficient of thermal expansion is high (50-100×10^-6/K) limiting bezel width reduction
Solution Approach 1:
The patent changes the material from polymer to glass, achieving low coefficient of thermal expansion (3-8×10^-6/K) typical of glass materials, which provides dimensional stability and enables bezel width reduction while maintaining ease of manufacture through standard glass processing
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 borosilicate glass light-guiding plate maintains optical characteristics and mechanical stability even at thin thicknesses, reducing the need for additional structural support and enabling a slim profile LCD with improved heat resistance and reduced bezel width.
Implementation Method 1
The light-guiding plate 25 is designed to guide light incident from the light source 23 to a direction of the liquid crystal panel 10
Implementation Method 2
a coefficient of thermal expansion (CTE) is about 50 to 100×10−6/K, which is high... The glass plate includes 75 to 85 wt % SiO2, 5 to 20 wt % B2O3, 1 to 5 wt % Al2O3, 3 to 8 wt % R2O... Fe2O3
Data Source
AI summary
A glass light-guiding plate which has high-temperature stability and is advantageous in being manufactured in a slim profile is provided. The glass light-guiding plate includes a glass plate including 75 to 85 wt % SiO2, 5 to 20 wt % B2O3, 1 to 5 wt % Al2O3, 3 to 8 wt % R2O (here, R is at least one of Li, Na, and K), and Fe2O3<0.0025 wt %.