Light Source Module Filter for Color Saturation and Gamut
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Solution Overview
Problem
Conventional light source modules using hybrid LEDs face challenges in achieving both better color saturation and a wider NTSC color gamut due to poor efficiency and chromatic aberration issues.
Innovation Solution
A light source module comprising a light-emitting element, a light-guiding plate, and a filter where the filter's center wavelength of the reflection band falls between 570 nm to 590 nm, filtering the emitted light to increase its color temperature, thereby enhancing color saturation and NTSC color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a blue light-emitting diode with green and red phosphors (hybrid LED) is used to increase color saturation, then color saturation is improved, but the NTSC color gamut remains narrow
Solution Approach 1:
The patent segments the light emission process into distinct stages: first generating blue light from a blue LED, then using separate phosphor materials (yellow phosphor and red phosphor) to convert specific wavelength portions. This segmentation allows independent optimization of each conversion stage, achieving both high color saturation and wide NTSC color gamut by controlling the spectral distribution through multiple discrete phosphor layers rather than a single hybrid phosphor system
Solution Approach 2:
The patent employs composite phosphor materials including yellow phosphor (such as Y3Al5O12:Ce) and red phosphor (such as CaAlSiN3:Eu) in specific combinations and thicknesses. These composite material structures enable precise control over the emitted spectrum, simultaneously achieving high color saturation through phosphor conversion and wide NTSC color gamut by tuning the phosphor composition and layer configuration
2Adaptability or versatility
If a red/blue/green three-color light-emitting diode is used, then color gamut coverage is improved, but efficiency deteriorates and chromatic aberration occurs due to different attenuation rates
Solution Approach 1:
The patent extracts the green light generation function from a separate green LED and instead generates it through phosphor conversion from blue light. This eliminates the need for three separate LED chips with different attenuation characteristics, maintaining high efficiency through a single blue LED source while achieving wide color gamut coverage through controlled phosphor emission
Solution Approach 2:
The patent introduces phosphor materials as intermediary substances that convert blue light into yellow and red wavelengths. These phosphors act as mediators that transform the single blue light source into a multi-wavelength output, achieving three-color (blue, yellow, red) emission without requiring three separate LED chips, thus avoiding chromatic aberration and efficiency loss
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 improves color saturation and expands the NTSC color gamut, achieving a higher color temperature and better display performance.
Implementation Method 1
a center wavelength of a reflection band of the filter falls in a range of 570 nm to 590 nm
Implementation Method 2
The first light is filtered into the second light having a second color temperature after it passes through the filter
Implementation Method 3
The stacked structure includes alternately stacked (N+1) first material layers and N second material layers, where N is a positive integer. Each of the second material layers is sandwiched between two of the first material layers. The first material layer has a first refractive index, the second material layer has a second refractive index
Data Source
AI summary
A light source module and a display device are provided. The light source module includes a light-emitting element, a light-guiding plate, and a filter. The light-emitting element includes a light-emitting surface. The light-guiding plate includes a light-incident surface, and the light guide plate is disposed such that the light-incident surface faces the light-emitting surface. The filter is disposed between the light-emitting surface and the light-incident surface, and a center wavelength of a reflection band of the filter falls in a range of 570 nm to 590 nm. The light-emitting element emits a first light having a first color temperature from the light-emitting surface. The first light is filtered into the second light having a second color temperature after it passes through the filter. The light-incident surface of the light-guiding plate receives the second light. The first color temperature is lower than the second color temperature.