Laminated Windshield OLED Backlighting for UV Safety
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Solution Overview
Problem
Existing laminated vehicle windshields with luminous signs face challenges due to the use of UV sources, which pose eye safety risks and are complex, and luminescent particles are sensitive to heat and bleaching, making the technology immature.
Innovation Solution
A laminated vehicle windshield design incorporating a flexible organic-light-emitting-diode (OLED) device between two mineral glass glazings with a thermoformable polymeric interlayer, where the OLED emits light in the visible spectrum to illuminate signs, addressing safety and complexity issues by eliminating UV sources and enhancing integration and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If UV sources with luminescent particles are used for backlighting, then luminous information display is achieved, but eye safety is compromised and device complexity increases
Solution Approach 1:
The patent changes the spectral parameter of the light source from UV domain to visible domain. Instead of using UV light sources that excite luminescent particles, the invention uses visible light LEDs that directly emit light in the visible spectrum, thereby eliminating the harmful UV radiation while maintaining the backlighting function for luminous signs.
Solution Approach 2:
The patent extracts and removes the UV light source component from the system. By taking out the UV source and its associated luminescent particles, the invention eliminates the safety hazards and complexity while retaining the essential function of providing backlighting for information display through alternative visible light LED sources.
2Illumination intensity
If UV sources with luminescent particles are used for backlighting, then luminous information display is achieved, but device complexity increases due to control systems
Solution Approach 1:
The patent removes the complex control system associated with UV sources and luminescent particles. By extracting this complex subsystem, the invention simplifies the overall device while maintaining the capability to display luminous information through simpler visible light LED sources that do not require such complex control mechanisms.
3Illumination intensity
If luminescent particles are used, then backlighting is achieved, but reliability decreases due to sensitivity to heat and bleaching
Solution Approach 1:
The patent extracts and removes the luminescent particles from the system. By taking out these sensitive components that are prone to heat damage and bleaching, the invention eliminates the reliability issues while maintaining the backlighting function through more robust visible light LED sources that are not susceptible to these degradation mechanisms.
Solution Approach 2:
The patent changes the fundamental mechanism from luminescent particle excitation to direct visible light emission. This parameter change in the light generation mechanism eliminates the reliability problems associated with luminescent particles' sensitivity to heat and bleaching, as LEDs do not suffer from these specific degradation issues.
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 solution provides a safer, more integrated, and reliable means of displaying internal luminous information on vehicle windshields, offering good backlighting performance without glare, and is suitable for curved glass designs, improving visibility and reducing maintenance concerns.
Implementation Method 1
A laminated vehicle windshield design incorporating a flexible organic-light-emitting-diode (OLED) device between glazing layers, which emits light in the visible spectrum for backlighting internal signs
Data Source
AI summary
A laminated vehicle windshield containing internal luminous information, includes a first glazing, a lamination interlayer, a second glazing and peripheral exterior and interior masking layers. The interior masking layer is discontinuous and includes one or more first discontinuities that form a first sign. The windshield also includes a first curved organic-light-emitting-diode device to illuminate the first sign.