Display Light Source Using Dual Blue LED Chips for Eye Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional blue light cutting methods for display devices reduce brightness and image quality while attempting to protect the human eye from blue light hazards.
Innovation Solution
A light source for display devices incorporating a combination of short-wavelength and long-wavelength blue LED chips, where the peak wavelength of the long-wavelength blue light is shifted to reduce blue light hazards without compromising brightness, using LED packages that can switch between modes to adjust the spectrum and maintain display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blue light cut film is attached to the display device to restrain the intensity of blue light, then blue light hazard is reduced, but the entire brightness of the display device is reduced and the image becomes yellowish
Solution Approach 1:
The patent changes the spectral parameters of the light source by using LED chips with different peak wavelengths (440nm, 450nm, 460nm, or 470nm) instead of a single wavelength. This parameter change allows the blue light peak to be shifted to longer wavelengths that are less harmful to the eyes while maintaining sufficient brightness and avoiding the yellowish tint caused by conventional blue light cut films.
Solution Approach 2:
The patent employs a composite light source system combining multiple LED chips with different spectral characteristics. This composite approach creates a synergistic effect where the combination of different wavelength LEDs produces a balanced spectrum that reduces blue light hazard while preserving display brightness and color quality, avoiding the trade-off present in conventional single-LED solutions with blue light cut films.
2Object-affected harmful factors
If a blue light cut film is attached to the display device to restrain the intensity of blue light, then blue light hazard is reduced, but the display quality is reduced due to yellowish image
Solution Approach 1:
The patent modifies the spectral parameters of the light source by selecting LED chips with peak wavelengths of 440nm, 450nm, 460nm, or 470nm. This parameter optimization allows the blue light component to be shifted toward longer wavelengths that are less harmful to the eyes while maintaining the color balance and display quality, thereby avoiding the yellowish image degradation caused by conventional blue light cut films.
Solution Approach 2:
The patent uses a composite light source comprising multiple LED chips with different spectral characteristics. This composite structure enables precise control over the overall spectrum, reducing blue light hazard while maintaining accurate color reproduction and high display quality, thus avoiding the quality compromise associated with blue light cut films.
3Object-affected harmful factors
If LED chips with different peak wavelengths are used in the light source, then blue light hazard is reduced while maintaining brightness, but the device complexity increases
Solution Approach 1:
The patent segments the light source into multiple independent LED chip units, each emitting at a specific peak wavelength (440nm, 450nm, 460nm, or 470nm). This segmentation allows for modular design where each LED chip can be independently controlled and optimized, facilitating the reduction of blue light hazard while maintaining overall system manageability and reducing complexity through standardized modular components.
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 effectively reduces blue light hazards while maintaining display quality by shifting the peak wavelength of blue light emission, providing an eye protection function without significant reduction in brightness or image quality.
Implementation Method 1
a first LED chip emitting a first light having a peak located within the range of wavelengths 380 nm to 500 nm, and a second LED chip emitting a second light having a peak located within the range of wavelengths 380 nm to 500 nm
Data Source
AI summary
A light source for a display device, includes: a first LED chip emitting a first light having a peak located within the range of wavelengths 380 nm to 500 nm, and a second LED chip emitting a second light having a peak located within the range of wavelengths 380 nm to 500 nm, wherein the peak wavelength of the second light is longer than the peak wavelength of the first light, and the difference between the peak wavelength of the second light and the peak wavelength of the first light is less than 40 nm and greater than or equal to 10 nm.