Blue LED Active Layer and Filtering for Higher Color Saturation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light emitting diodes (LEDs) struggle to achieve high color saturation, which affects the clarity and vividness of illuminated objects, necessitating improvements in light saturation for better object representation.
Innovation Solution
A light emitting device with a nitride-based active layer containing 14% or more indium, emitting light in a blue wavelength band, is combined with a filter blocking desaturating wavelengths and a wavelength conversion material to enhance saturation, resulting in a higher ratio of light in the saturation enhancement band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional LED structure is used, then the device is simple to manufacture, but the color saturation of emitted light is insufficient
Solution Approach 1:
The patent employs a composite light generation layer comprising multiple semiconductor layers with different bandgaps (first semiconductor layer with first bandgap, second semiconductor layer with second bandgap greater than the first). This composite structure enables simultaneous emission of light in different wavelength bands, with the first layer providing saturation-enhancing wavelengths and the second layer providing desaturation-filtered wavelengths, thereby achieving high color saturation without excessive device complexity
Solution Approach 2:
The patent applies local quality by creating spatially differentiated light emission characteristics within the light generation layer. The first semiconductor layer is positioned to emit light primarily in directions where saturation enhancement is needed, while the second semiconductor layer emits in complementary directions or wavelength ranges. This local differentiation of emission properties allows selective enhancement of color saturation in specific spectral regions
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 significantly increases the ratio of light in the saturation enhancement band, reducing desaturating wavelengths and enhancing overall light saturation, thereby improving the clarity and vividness of illuminated objects.
Implementation Method 1
A light emitting diode is an inorganic semiconductor device that emits light generated through recombination of electrons and holes
Implementation Method 2
a filter blocking or absorbing light in the desaturation band
Implementation Method 3
a wavelength conversion material to enhance saturation
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Disclosed are a light emitting device, a light emitting package and a backlight unit including the same. A light emitting device emitting light in a blue wavelength band may include a light generation layer and an electrode. The light generation layer may include a first semiconductor layer, a second semiconductor layer, and an active layer formed between the first semiconductor layer and the second semiconductor layer. The electrode may include a first electrode electrically connected to the first semiconductor layer and a second electrode electrically connected to the second semiconductor layer. Here, for the light emitting device, the quantity of light in a desaturation band may be lower than the quantity of light in other wavelength bands.