Backlight Unit Light Guide Plate Wavelength Conversion
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Solution Overview
Problem
Conventional backlight units for liquid crystal display devices face challenges in reducing power consumption and improving image quality due to the inefficiency of wavelength conversion materials, which are dependent on the wavelength of light emitted by the light source and can increase power consumption when low-efficiency sources are used.
Innovation Solution
The integration of a single optical member that performs both light guiding and wavelength conversion functions, utilizing a first and second light guide plate with a wavelength conversion layer in between, along with low refractive layers and protective layers, and employing near-ultraviolet and blue light sources to enhance light conversion efficiency and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light source is used for both blue and near-ultraviolet light emission, then device complexity is reduced, but power consumption increases due to the need for separate high-power light sources
Solution Approach 1:
The backlight unit is divided into multiple independent light source modules: a first light source for near-ultraviolet light and a second light source for blue light. Each light source is independently positioned and controlled, allowing optimized power consumption for each wavelength without compromising the other.
2Manufacturing precision
If wavelength conversion materials are used to convert blue light to green and red, then color reproducibility is improved, but power consumption increases due to low conversion efficiency
Solution Approach 1:
The patent employs wavelength conversion materials with optimized parameters (conversion efficiency, spectral characteristics) to convert near-ultraviolet and blue light into green and red wavelengths. By carefully selecting and positioning these materials, the system achieves high color reproducibility while minimizing energy loss during conversion.
3Reliability
If multiple separate optical members are used for light guiding and wavelength conversion, then functional performance is optimized, but assembly complexity increases
Solution Approach 1:
The patent integrates the light guiding function and wavelength conversion function into a single integrated optical member. This member contains both the light guide structure and the wavelength conversion material layer, eliminating the need for separate components and simplifying the assembly process while maintaining optimal optical performance.
4Ease of manufacture
If low-efficiency light sources are used, then device cost is reduced, but power consumption increases significantly
Solution Approach 1:
The patent employs high-efficiency light sources specifically designed for near-ultraviolet and blue light emission. By optimizing the parameters of these light sources (wavelength, efficiency, power output), the system achieves superior conversion efficiency and lower power consumption compared to conventional low-efficiency sources.
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
This solution simplifies the assembly process, improves light conversion efficiency, and reduces power consumption by effectively converting near-ultraviolet and blue light into green and red light, enhancing color reproducibility while minimizing the overall power required for light emission.
Implementation Method 1
a first wavelength conversion layer disposed between the first light guide plate and the second light guide plate... The first wavelength conversion layer may include first wavelength conversion material particles, and the first wavelength conversion material particles are configured to convert the first light into green light
Implementation Method 2
a first low refractive layer disposed between the first light guide plate and the first wavelength conversion layer, wherein the first low refractive layer has a lower refractive index than the first light guide plate
Data Source
AI summary
A backlight unit includes a first light guide plate, a second light guide plate disposed over the first light guide plate, and a first wavelength conversion layer disposed between the first light guide plate and the second light guide plate.