Aluminosilicate Glass Light Guide Plate for LCD Displays
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Solution Overview
Problem
Conventional light guide plates made of PMMA exhibit poor mechanical properties such as rigidity, coefficient of thermal expansion (CTE), and moisture absorption, which pose challenges in large-sized LCD displays, particularly in terms of structural integrity and humidity-induced light coupling efficiency.
Innovation Solution
A glass light guide plate with a specific composition of Al2O3, SiO2, B2O3, and R x O, where R is selected from Li, Na, K, Rb, Cs, Zn, Mg, Ca, Sr, or Ba, and Fe is minimized to <50 ppm, offering improved mechanical and optical performance, including enhanced rigidity, reduced CTE, and better moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If PMMA is used as light guide plate material, then light transmission is excellent, but mechanical properties such as rigidity and CTE are poor
Solution Approach 1:
The patent changes the material composition from PMMA to glass with specific oxide parameters (SiO2: 50-90 mol%, Al2O3: 0-15 mol%, B2O3: 0-12 mol%, RxO: 0-25 mol%). This parameter change transforms the material properties to achieve both high light transmission and improved mechanical rigidity, resolving the contradiction between optical and mechanical performance.
Solution Approach 2:
The patent uses composite glass material containing multiple oxides (silica, alumina, boron oxide, and alkali/alkaline earth oxides) to create a light guide plate that combines the advantages of different materials. The composite structure provides both excellent light transmission and superior mechanical properties, including rigidity and low CTE.
2Illumination intensity
If PMMA is used as light guide plate material, then light transmission is excellent, but moisture absorption is poor
Solution Approach 1:
The patent changes the material composition from PMMA to glass with specific oxide parameters. The glass composition (SiO2: 50-90 mol%, Al2O3: 0-15 mol%, B2O3: 0-12 mol%) inherently provides low moisture absorption properties while maintaining high light transmission, thus resolving the contradiction between optical performance and moisture resistance.
3Strength
If glass light guide plate is used, then mechanical properties are improved, but manufacturing precision requirements increase due to CTE control
Solution Approach 1:
The patent optimizes the oxide composition parameters to control the coefficient of thermal expansion (CTE). By adjusting SiO2 (50-90 mol%), Al2O3 (0-15 mol%), and B2O3 (0-12 mol%), the glass achieves low CTE values that match substrate materials, enabling precise manufacturing and assembly in large-sized LCD displays while maintaining mechanical rigidity.
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 glass light guide plate provides superior mechanical stability, efficient light coupling, and reduced humidity-induced brightness variations, while maintaining high transmission values and thermal conductivity, addressing the limitations of PMMA-based plates.
Implementation Method 1
Light guide plates (LGP) are an important component in display devices such as liquid crystal displays (LCD). The light guide plate is used to guide light from a light source, such as an LED, across the display panel.
Implementation Method 2
the glass light guide plate provides superior mechanical stability, efficient light coupling, and reduced humidity-induced brightness variations
Data Source
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AI summary
Compounds, compositions, articles, devices, and methods for the manufacture of light guide plates and back light units including such light guide plates made from glass. In some embodiments, light guide plates (LGPs) are provided that have similar or superior optical properties to light guide plates made from PMMA and that have exceptional mechanical properties such as rigidity, CTE and dimensional stability in high moisture conditions as compared to PMMA light guide plates.