Spontaneously Opalizing Glass Ceramic Light Diffuser
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Solution Overview
Problem
Existing light diffuser solutions for backlit liquid crystal displays (LCDs) face challenges due to increased operating temperatures, which cause polymers to expand and deform, requiring thick bezels to hide the expansion, and existing light diffusing opal glasses are not environmentally friendly and cannot be formed by fusion methods.
Innovation Solution
A glass composition comprising 60-82 mol % SiO2, 2.1-12 mol % Al2O3, 0-15 mol % B2O3, 5-18 mol % Na2O, 0-3 mol % MgO, 2.5-12 mol % CaO, and 0.15-7 mol % P2O5, which opalizes spontaneously without heat treatment, exhibits wavelength-independent scattering, and is configured for use as a light diffuser in backlit display panels with a thickness of 0.5 mm to 1.5 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymer diffuser materials are used, then manufacturing ease and cost-effectiveness are improved, but thermal stability deteriorates causing expansion and deformation at high operating temperatures
Solution Approach 1:
The patent changes the material parameter from polymer to glass ceramic composition, which fundamentally alters the thermal behavior. The glass ceramic material maintains dimensional stability at high temperatures while preserving the light diffusing function, thus resolving the contradiction between ease of manufacture and thermal stability.
Solution Approach 2:
The patent employs a composite glass ceramic material consisting of multiple oxides (SiO2, Al2O3, B2O3, Na2O, CaO, P2O5) that work synergistically to provide both thermal stability and optical properties. This composite approach allows the material to maintain structural integrity at elevated temperatures while continuing to diffuse light effectively.
2Illumination intensity
If LED power and number are increased to improve brightness, then illumination intensity is improved, but operating temperature increases causing polymer expansion and deformation
Solution Approach 1:
The patent changes the diffuser material parameter from temperature-sensitive polymer to thermally stable glass ceramic. This parameter change allows the system to accommodate higher operating temperatures generated by increased LED power without suffering from polymer expansion and deformation, thus enabling higher brightness output.
3Illumination intensity
If existing opal glass compositions are used, then light diffusing performance is improved, but environmental sustainability deteriorates due to non-environmentally friendly components
Solution Approach 1:
The patent changes the chemical composition parameters of the glass ceramic to use environmentally sustainable oxides (SiO2, Al2O3, B2O3, Na2O, CaO, P2O5) while maintaining the optical properties necessary for effective light diffusing. This parameter change achieves both environmental sustainability and functional performance.
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 composition provides a thin, environmentally friendly, and thermally stable light diffuser that maintains wavelength-independent scattering and high transmittance, addressing the challenges of polymer expansion and environmental sustainability in existing solutions.
Implementation Method 1
Silica is used because it has nearly no absorbance of visible wavelengths and has a higher refractive index than the polymer, resulting in light scattering
Implementation Method 2
the increased power and number of LEDs results in an increased operating temperature
Data Source
AI summary
A glass composition is provided wherein the composition exhibits wavelength independent scattering of visible light. The glass composition may comprise a spontaneously opalizing glass composition. The glass composition may comprise a fusion formable ceramic glass composition. The glass composition comprises crystals having a size greater than or equal to 1 μm. A targeted total transmittance value of the glass composition is 50% to 80%. The glass composition is configured for use as a light diffuser for a backlit display panel. The glass composition is configured such that the light diffuser appears white in transmission. A light diffuser for a backlit display panel is provided. The light diffuser may comprise a laminate comprising a core layer comprising a clear glass, and a clad layer comprising a fusion formable ceramic glass composition. The laminate may comprise a double fusion laminate.