GaInN Light Emitting Device for DCI-P3 Color Gamut
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Solution Overview
Problem
Conventional digital cinema projectors using xenon lamps face challenges in maintaining brightness and implementing High Dynamic Range (HDR) functions, as they require frequent lamp replacements and struggle to cover the DCI-P3 color space effectively.
Innovation Solution
A light emitting device with a semiconductor layer and light emitting layer having a specific composition ratio of Ga(1-x)InxN, where x is between 0.14 and 0.16 for blue light emission and between 0.22 and 0.26 for green light emission, is used to satisfy the DCI-P3 color gamut, integrated into a light emitting device package that includes a body frame and lead frames for efficient light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a xenon lamp is used as the light source in a digital cinema projector, then the device can screen movies with sufficient brightness, but the lamp requires frequent replacement every few months
Solution Approach 1:
The patent changes the fundamental parameter of the light source from a thermal xenon lamp to a solid-state light emitting device with specific GaInN composition ratios. By controlling the indium content (x=0.14-0.16 for blue, x=0.22-0.26 for green), the device achieves both high brightness and extended operational life, eliminating the frequent lamp replacement issue while maintaining DCI-P3 color gamut coverage
Solution Approach 2:
The patent replaces the mechanical/thermal xenon lamp system with a solid-state semiconductor light emitting device. This substitution eliminates the filament and gas fill requirements of xenon lamps, providing a more reliable light source that maintains brightness without the degradation and replacement issues inherent in thermal lamp systems
2Illumination intensity
If a xenon lamp is used to achieve high brightness, then movies can be screened with given brightness levels, but the device cannot implement High Dynamic Range (HDR) function capable of raising brightness 5 to 10 times
Solution Approach 1:
The patent creates a light source with universal applicability by designing a GaInN-based device that can operate across multiple brightness ranges. The specific composition ratios enable the device to function both in standard brightness modes for regular movie screening and in high brightness modes for HDR content, making a single light source adaptable to multiple viewing requirements without needing separate lamp systems
3Duration of action of stationary object
If a xenon lamp is used as the light source, then the projector can operate for a period, but it has difficulty in screening movies with a given brightness or higher and cannot maintain DCI-P3 color space coverage
Solution Approach 1:
The patent fundamentally changes the light source parameter from a degrading thermal xenon lamp to a stable solid-state GaInN device. The controlled indium composition ratios (x=0.14-0.16 for blue, x=0.22-0.26 for green) ensure consistent spectral output and brightness maintenance over extended operational periods, while maintaining accurate DCI-P3 color space coverage that xenon lamps cannot sustain
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 enables the light emitting device package to emit light within the DCI-P3 color gamut, providing a stable and long-lasting alternative to traditional projectors that can achieve HDR functionality without the need for frequent lamp replacements, thus being environmentally friendly and suitable for long-term use in theaters.
Implementation Method 1
a light emitting layer disposed in the semiconductor layer and having a composition ratio of Ga(1-x)InxN. x is greater than 0.14 but less than 0.16 to emit a blue light from the light emitting layer
Implementation Method 2
x is greater than 0.22 but less than 0.26 to emit a green light from the light emitting layer. The light emitting layer may emit the green light having a wavelength band in a range of 540 to 545 nm
Data Source
AI summary
A light emitting device includes a semiconductor layer, and a light emitting layer disposed in the semiconductor layer and having a composition ratio of Ga(1-x)InxN. x is greater than 0.14 but less than 0.16 to emit a green light from the light emitting layer, or greater than 0.22 but less than 0.26 to emit a blue light from the light emitting layer.