Projector Light Source Unit with Segmented Wavelength Control
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Solution Overview
Problem
Existing light source units for projectors face limitations in extending luminescent light emission time, leading to insufficient luminance for certain colors and challenging color balance in projected images.
Innovation Solution
A light source unit comprising a first light emitting device for blue light, a luminescent wheel with a luminescent light emitting area excited by blue light, a second light emitting device for red light, and a color wheel that combines and controls light in different wavelength ranges to achieve improved color balance through time-sharing control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If luminescent material layers are provided on the luminescent wheel, then the luminescent wheel can emit light in different wavelength ranges, but the extension range of luminescent light emitting time is physically limited and sufficient luminance cannot be secured for some colors
Solution Approach 1:
The light source unit is divided into multiple independent light emitting devices (first light emitting device for blue light, second light emitting device for red light) and a luminescent wheel with luminescent material layers. Each component operates semi-independently to contribute to different wavelength ranges, allowing the system to overcome the limited emission time of individual luminescent materials by combining multiple sources.
Solution Approach 2:
The patent combines light from multiple independent light emitting devices with luminescent light from the luminescent wheel through a combining device. This merging of multiple light sources (blue light from first device, green luminescent light from luminescent wheel, red light from second device) creates a composite light output that maintains sufficient luminance across all colors by pooling energy from multiple sources.
2Adaptability or versatility
If luminescent material layers are provided on the luminescent wheel, then the luminescent wheel can emit light in different wavelength ranges, but sufficient luminance to form an image cannot be secured for some colors
Solution Approach 1:
The illumination task is segmented across multiple independent light emitting devices and luminescent materials. Instead of relying on a single luminescent layer to provide all wavelengths, the system divides the spectral coverage into separate segments (blue from first device, green from luminescent wheel, red from second device), with each segment optimized for its specific wavelength range, thereby maintaining high luminance in each color channel.
Solution Approach 2:
The combining device merges light beams from multiple independent sources (first light emitting device, luminescent wheel, second light emitting device) into a unified output. This merging consolidates the luminance from all sources, ensuring that the combined light output has sufficient intensity across the full spectral range to form high-quality images.
3Adaptability or versatility
If luminescent material layers are provided on the luminescent wheel, then the luminescent wheel can emit light in different wavelength ranges, but it becomes difficult to ensure the color balance of the whole projected image
Solution Approach 1:
The color balance control is segmented into independent adjustments for each wavelength component. The control unit separately manages the first light emitting device (blue), luminescent wheel (green), and second light emitting device (red), allowing precise independent tuning of each color channel's intensity and timing to achieve balanced overall color output.
Solution Approach 2:
The system employs dynamic control where the control unit adjusts the operation parameters (intensity, timing, duration) of each light emitting device and luminescent wheel segment in real-time. This dynamic adjustment capability allows the system to maintain stable color balance under varying operating conditions by continuously optimizing the contribution of each wavelength component.
Solution Approach 3:
The light emitting devices and luminescent wheel operate in synchronized periodic cycles, with each component emitting light in coordinated time intervals. This periodic operation allows the control unit to precisely manage the temporal distribution of different wavelengths, ensuring that each color contributes appropriately to the overall image and maintaining consistent color balance across the projected output.
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
Enhances color balance and luminance by effectively combining and controlling light in different wavelength ranges, ensuring brighter and more balanced color projection.
Implementation Method 1
a luminescent wheel including a luminescent light emitting area configured to emit luminescent light that is excited by the light in the first wavelength range as light in a second wavelength range
Data Source
AI summary
A light source unit includes a first light emitting device configured to emit light in a first wavelength range, a luminescent wheel comprising a luminescent light emitting area configured to emit luminescent light that is excited by the light in the first wavelength range as light in a second wavelength range, and a color wheel onto which the light in the first wavelength range and the light in the second wavelength range are shined. A filter selects a part of the wavelength from the shined light in the first wavelength range and the light in the second wavelength range. A wheel surface of the color wheel is inclined with respect to axes of the light in the first wavelength range and the light in the second wavelength range.