Light Source Unit for Projector Color Balance
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Solution Overview
Problem
Conventional projectors face challenges in adjusting brightness and color balance due to the use of high-intensity discharge lamps and varying luminosity factors across different wavelength ranges, leading to inefficiencies and reduced image quality.
Innovation Solution
A light source unit comprising a first light source, a luminescent wheel with second and third light sources excited by the first light source, and a fourth light source, where the light sources are controlled to optimize color mixing and brightness through specific timing and positioning to enhance color balance and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-intensity discharge lamps are used as light source, then brightness is improved, but color balance adjustment capability deteriorates
Solution Approach 1:
The patent segments the light source system into multiple independent light sources emitting at different wavelengths (blue, green, red). Each light source can be independently controlled, allowing separate adjustment of color components while maintaining high overall brightness. This segmentation enables precise color balance control without sacrificing illumination intensity.
2Adaptability or versatility
If light sources with different luminosity factors are used, then color balance control is improved, but turn-off periods increase
Solution Approach 1:
The patent implements periodic action by rotating a color wheel that sequentially positions different wavelength conversion regions in the optical path. This allows the system to cycle through different color combinations rapidly, achieving color balance control while minimizing turn-off periods. The periodic rotation enables continuous light emission with controlled spectral composition.
Solution Approach 2:
The system employs dynamic control by varying the rotation speed and position of the color wheel, as well as independently modulating the intensity of each light source. This dynamic adjustment capability allows real-time optimization of color balance without requiring complete turn-off of the light sources, thereby reducing time loss.
3Adaptability or versatility
If multiple light sources are added for color mixing, then color balance is improved, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by designing a color wheel that simultaneously performs wavelength conversion, color mixing, and timing control functions. The single rotating component integrates multiple roles, reducing the need for separate devices for each function. This universal approach maintains color balance control capability while limiting device complexity growth.
Solution Approach 2:
The system merges the functions of multiple light sources and color conversion elements into a single integrated light source unit. By combining blue light emission with phosphor-based wavelength conversion in one compact assembly, the patent reduces overall device complexity while maintaining the capability for precise color balance adjustment through electronic control of the constituent light sources.
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 allows for extensive adjustment of brightness and color balance, reducing turn-off periods and enhancing image quality by effectively combining light sources with varying luminosity factors, thereby projecting highly bright and color-accurate images.
Implementation Method 1
a luminescent wheel including a second light source for emitting light in a second wavelength range which is luminous light excited by the light in the first wavelength range
Implementation Method 2
a third light source for emitting light in a third wavelength range which is luminous light excited by the light in the first wavelength range and whose wavelength differs from a wavelength of the light in the second wavelength range
Data Source
AI summary
A light source unit includes a first light source for emitting light in a first wavelength range, a luminescent wheel including a second light source for emitting light in a second wavelength range and a third light source for emitting light in a third wavelength range whose wavelength differs from that of the light in the second wavelength range, which are disposed circumferentially end to end in an adjacent fashion, a fourth light source for emitting light in a fourth wavelength range similar in color system to the light in the second or third wavelength range, and a control unit for controlling the fourth light source and the luminescent wheel to illuminate the fourth light source during a first color mixing period when a boundary between the second and third light sources is situated on an optical path of the light in the first wavelength range.