Backlight Unit With Alternating LED Packages and Phosphors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional backlight units for liquid crystal displays using RGB full-color LED packages or respective LED chips face increased manufacturing costs and decreased yield due to complex configurations and higher chip counts.
Innovation Solution
A backlight unit comprising alternately arranged first and second LED packages, where the first package includes a blue and green LED chip with a red phosphor to emit white light, and the second package includes a blue and red LED chip with a green phosphor, reducing the number of LED chips and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional RGB full-color LED packages or respective LED chips are used, then color reproduction range is improved, but manufacturing cost increases and yield decreases
Solution Approach 1:
The invention divides the backlight unit into multiple types of LED packages (first, second, third, and fourth types), each with specific LED chip and phosphor combinations. This segmentation allows optimization of each package type for particular color emission characteristics, achieving comprehensive color reproduction while simplifying individual package designs compared to conventional RGB full-color packages.
Solution Approach 2:
The invention combines multiple LED chips and phosphors within each LED package type to generate white light or specific color light. For example, first LED packages combine blue LED chips with yellow phosphors, while second LED packages combine red and green LED chips with appropriate phosphors. This merging approach achieves effective color reproduction with simpler individual package configurations.
2Illumination intensity
If conventional RGB full-color LED packages or respective LED chips are used, then color reproduction range is improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the need for complex RGB full-color LED packages by using separate LED packages with specific LED chip and phosphor combinations. This extraction of unnecessary complexity from individual packages reduces manufacturing difficulty and cost while maintaining effective color reproduction through the coordinated arrangement of multiple package types.
Solution Approach 2:
The invention uses simpler LED package designs with fewer and more standardized LED chips and phosphors per package, making each individual package cheaper to manufacture. The alternately arranged configuration of multiple such packages achieves the required color reproduction performance without requiring expensive complex packages.
3Illumination intensity
If conventional RGB full-color LED packages or respective LED chips are used, then color reproduction range is improved, but yield decreases
Solution Approach 1:
By segmenting the backlight unit into multiple types of LED packages with specific, optimized components, the invention reduces the complexity and variability within each package. This segmentation improves manufacturing yield by making each package type easier to produce consistently, while the overall color reproduction is achieved through the combination of package types.
Solution Approach 2:
The invention changes the parameters of LED packages by specifying particular LED chip types (blue, red, green) and phosphor combinations for each package type. This parameter standardization across multiple packages of the same type improves manufacturing yield by reducing variability, while the alternately arranged configuration maintains comprehensive color reproduction.
4Ease of manufacture
If first and second LED packages are alternately arranged, then manufacturing cost is reduced and yield is improved, but color reproduction range may not match conventional RGB full-color LED packages
Solution Approach 1:
The invention designs LED packages with multi-functionality where each package type serves multiple purposes. For example, first LED packages with blue LED chips and yellow phosphors provide both blue light and contribute to white light generation, while second LED packages with red and green LED chips provide both their respective color lights and contribute to overall color reproduction. This universality allows effective color reproduction with simpler package configurations.
Solution Approach 2:
The invention transitions from considering individual package color output to a spatial arrangement dimension by alternately arranging different LED package types. This spatial dimension allows the backlight unit to achieve comprehensive color reproduction through the combined light output of multiple package types positioned in specific patterns, rather than relying on each individual package to provide full color reproduction.
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 configuration achieves a high color reproduction range while reducing manufacturing costs and improving yield and reliability by using fewer LED chips, although it may not match the color reproduction range of conventional RGB full-color LED packages.
Implementation Method 1
a first phosphor, the first phosphor being excited by blue light and to emit light to be mixed with blue light and the green light respectively emitted from the blue LED chip and the green LED chip
Implementation Method 2
a blue LED chip, a green LED chip
Data Source
AI summary
The present invention relates to a backlight unit that includes at least one first light emitting diode (LED) package and at least one second LED package, wherein the first LED package includes a blue LED chip, a green LED chip, and a first phosphor, the first phosphor being excited by blue light and to emit light to be mixed with blue light and green light respectively emitted from the blue LED chip and the green LED chip, the first LED package to thereby emit white light. The second LED package includes a blue LED chip, a red LED chip, and a second phosphor, the second phosphor being excited by blue light and to emit light to be mixed with blue light and red light respectively emitted from the blue LED chip and the red LED chip, the second LED package to thereby emit white light.