Projector Light Source Device with Time-Division Control
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Solution Overview
Problem
Existing light source devices for projectors face issues with luminous efficiency, particularly with red fluorescent substances being lower than green and blue, leading to insufficient red luminance, white balance loss, and reduced color reproducibility, even when trying to prioritize brightness or white balance.
Innovation Solution
A light source device comprising multiple light sources and a control system that uses time division to generate light of different wavelengths cyclically, with detection and adjustment mechanisms to optimize light intensity and emission timing, ensuring compatibility between color reproducibility and luminosity over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the emission period of red is extended to compensate for low luminous efficiency, then white balance is improved, but overall luminance is lowered
Solution Approach 1:
The patent changes the temporal distribution parameters of light emission by extending the emission period of red light specifically. This parameter adjustment allows the system to compensate for the low luminous efficiency of red fluorescent substances while maintaining overall luminance through coordinated control of multiple light sources.
Solution Approach 2:
The patent implements periodic emission cycles for different colored light sources, with red light having a longer emission period within each cycle. This periodic action with varying durations for different colors enables white balance compensation while managing overall luminance output.
2Manufacturing precision
If the emission period of red is extended to improve white balance, then color reproducibility is improved, but the image becomes darker
Solution Approach 1:
The patent adjusts the temporal emission parameters of red light to extend its duration within the display cycle. This parameter change improves color reproducibility by providing sufficient red luminance while the coordinated control of green and blue light sources maintains overall image brightness.
Solution Approach 2:
The patent implements dynamic control of light emission timing and duration for different colors. The emission period of each color is dynamically adjusted based on its luminous efficiency characteristics, with red light receiving extended emission time to achieve proper color reproduction without sacrificing overall image brightness.
3Productivity
If priority is given to luminance, then bright projection image is achieved, but red luminance becomes insufficient and white balance is lost
Solution Approach 1:
The patent changes the emission timing parameters to provide extended duration for red light within each display cycle. This parameter adjustment ensures sufficient red luminance accumulation while maintaining high overall projection brightness through efficient utilization of green and blue light sources.
Solution Approach 2:
The patent employs periodic emission cycles with differentiated durations for each color. Red light is emitted for a longer period within each cycle to accumulate sufficient luminance, while green and blue light sources operate at higher intensities during their respective periods, maintaining overall projection brightness.
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 compensates for aged deterioration in light sources and fluorescent substances, maintaining compatible color reproducibility and luminosity in projector images, while simplifying the detection process and minimizing manufacturing costs.
Implementation Method 1
a first light source configured to emit light in a first wavelength range
Implementation Method 2
a second light source configured to emit light-source light of a second wavelength range different from the first wavelength range
Data Source
AI summary
A first light source control section controls the drive timing of each of the first and second light sources, and light-source light generation section such that the light-source light generated from each of the light-source light generation section and second light source is cyclically generated. A detection section detects the light intensity of the light-source light generated from each of the light-source light generation section and second light source. A storage section stores therein the light intensity value of the light-source light generated from each of the light-source light generation section and second light source detected by the detection section. A second light source control section adjusts the light emission state of each of the first and second light sources on the basis of the detection results of the detection section with respect to the light-source light intensity values stored in the storage section.