Light Source Module Filter for Adobe RGB Backlight
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Solution Overview
Problem
Current backlight units for large screen LCDs, such as TVs, fail to fully cover the Adobe RGB color space, limiting their ability to display a wide range of colors, particularly in the green and blue spectrum, and thus struggle to achieve high color reproducibility.
Innovation Solution
A light source module with a filter is introduced, comprising a blue LED with a red phosphor and a filter attached using a thermosetting resin, where the filter has specific transmission areas to enhance color reproduction, including a range of 630 nm to 660 nm for red light and 510 nm to 540 nm for blue light, improving the backlight unit's color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional backlight unit with blue LED and red phosphor is used, then the structure is simple and manufacturing is easy, but the color space coverage is limited to 95% of Adobe RGB
Solution Approach 1:
The backlight unit is divided into multiple independent light source modules, each containing a blue LED and a specific filter. This segmentation allows each module to be optimized for specific color ranges while maintaining overall system simplicity and manufacturability.
Solution Approach 2:
Different filters with specific transmission characteristics are applied to different light source modules based on their positional requirements. Filters are selectively placed to transmit specific wavelength ranges (e.g., 630-660 nm for red, 510-540 nm for blue) at different locations, achieving full Adobe RGB coverage while keeping the overall structure manageable.
2Adaptability or versatility
If multiple light source modules with multiple filters are implemented, then color reproducibility is improved to achieve 100% Adobe RGB coverage, but the device complexity increases
Solution Approach 1:
Multiple light source modules with different filters are arranged in an alternating pattern and integrated into a single backlight unit structure. The modules are combined in a systematic alternating sequence, which achieves full color space coverage while maintaining structural organization and avoiding excessive complexity.
Solution Approach 2:
The transmission characteristics of filters are precisely controlled with specific wavelength ranges (630-660 nm for red, 510-540 nm for blue). By optimizing these spectral parameters and arranging modules in alternating patterns, the system achieves 100% Adobe RGB coverage while keeping the overall design manageable through parameter optimization rather than uncontrolled complexity.
3Manufacturing precision
If filters with specific transmission areas are attached to light source modules, then color reproducibility is significantly improved, but the manufacturing process becomes more complex
Solution Approach 1:
Filters with specific transmission characteristics are pre-selected and pre-positioned on light source modules during the assembly process. By preparing filters in advance with known transmission properties and attaching them in a predetermined alternating pattern, high color reproducibility is achieved while streamlining the manufacturing process through advance preparation rather than complex real-time adjustments.
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 implementation of the light source module with filters allows the backlight unit to achieve 100% coverage of the Adobe RGB color space, significantly improving color reproducibility and luminance uniformity, as demonstrated by experimental results showing a decrease in full width at half maximum (FWHM) and increased achievement ratio in the CIE 1931 and CIE 1976 color spaces.
Implementation Method 1
a filter filtering the light produced from the light source... the filter may have a transmission area which is equal to or greater than 630 nm and equal to or less than 660 nm... the filter of the second light source module may have a transmission area which is equal to or greater than 510 nm and equal to or less than 540 nm
Implementation Method 2
a blue LED with a red phosphor... the first light source module may include a blue LED and a red phosphor disposed on the blue LED
Implementation Method 3
the filter may be attached on a LED chip including the receiving container and the light source using a thermosetting resin
Data Source
AI summary
A light source module includes a receiving container, a light source disposed in the receiving container and a filter filtering the light produced from the light source. A backlight unit includes a plurality of light source modules. The plurality of light source modules include a first light source module with a filter and a second light source module alternately disposed with the first light source module. The filter includes a substrate, a transparent layer disposed on the first metal layer and a second metal layer disposed on the transparent layer. The filter transilluminating light of specific area is disposed on the light source module. Thus, the backlight unit having high color reproducibility may be manufactured.