Backlight Unit Blue Light Conversion
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Solution Overview
Problem
High-performance electronic displays, particularly those using LEDs, emit excessive blue light, which can be harmful to eye health and disrupt natural circadian rhythms, while existing solutions often compromise display brightness or increase power consumption to mitigate this issue.
Innovation Solution
Incorporating light conversion materials, such as quantum dots or luminescent nanoparticles, into backlight modules to selectively absorb and convert harmful blue and UV light into less hazardous wavelengths, maintaining true white color balance and optical clarity with minimal brightness loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light conversion materials are used to reduce blue light emissions, then eye safety is improved, but display brightness may be reduced
Solution Approach 1:
The patent converts harmful blue light (400-500nm) into beneficial green light (500-560nm) wavelengths using light conversion materials. This transforms the harmful radiation into useful visible light that contributes to display brightness while protecting eye health, directly resolving the contradiction between reducing blue light and maintaining brightness
Solution Approach 2:
The patent changes the wavelength parameter of light through light conversion materials, specifically converting blue light wavelengths to green light wavelengths. This parameter transformation allows the system to reduce blue light exposure while maintaining overall visibility and display performance
2Object-affected harmful factors
If light conversion materials are used to reduce blue light emissions, then eye safety is improved, but power consumption increases
Solution Approach 1:
The light conversion materials convert previously wasted blue light energy into useful green light, thereby reducing power consumption. Instead of blocking blue light (which would waste energy), the system converts it to usable wavelengths, improving energy efficiency while protecting eye health
Solution Approach 2:
The light conversion materials act as intermediaries that facilitate energy transfer from blue light to green light wavelengths. This intermediary process enables efficient energy utilization by converting harmful radiation into useful illumination, reducing overall power requirements
3Object-affected harmful factors
If light conversion materials are used to reduce blue light emissions, then color balance must be maintained, but optical clarity may be compromised
Solution Approach 1:
The patent deliberately changes the color composition of transmitted light by converting blue wavelengths to green wavelengths. This controlled color transformation maintains the overall white point and color balance of the display while reducing harmful blue light content, achieving both eye safety and color accuracy
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
Effectively reduces hazardous blue light emissions while maintaining display brightness and color balance, improving eye safety and power efficiency, with energy consumption increased by no more than 10% compared to reference displays.
Implementation Method 1
light conversion materials, such as quantum dots or luminescent nanoparticles, into backlight modules to selectively absorb and convert harmful blue and UV light into less hazardous wavelengths
Data Source
AI summary
A display system and method are disclosed that includes an electronic display device and a backlight comprising a light-emitting array, a reflector adjacent to the light-emitting array, a diffuser opposite the reflector, a first brightness enhancing layer adjacent the diffuser, and an optical film in the backlight unit that includes at least one light conversion material or at least one light conversion material. The light conversion material is structured and configured to reduce hazardous blue light emissions between about 400 nm to about 500 nm. The disclosed display device can include a liquid crystal panel configured to control transmission of light from the backlight to a viewer. The display device also includes one or more optical films that incorporate one or more light conversion or light absorbing materials. The optical films can be positioned between the layers of the disclosed display device and give enhanced blue-light absorption to the display device.