Light Source Unit With Segmented Red Elements For Projector Brightness
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Solution Overview
Problem
Conventional projectors face challenges in achieving high brightness and color balance due to differences in luminosity factors across various wavelength ranges, leading to inefficient optical part arrangements and reduced luminous efficiency, especially when trying to enhance the red light source to compensate for its lower luminosity.
Innovation Solution
A light source unit comprising multiple light sources emitting in different wavelength ranges, including a first and second red light source, a blue light source, and a green light source, with a control unit that adjusts the illumination of these sources to optimize brightness and color balance, using dichroic mirrors to align and combine light paths effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the size and output of the red light source are enlarged to increase luminance, then the brightness of the projected image is improved, but the luminous efficiency of the light source is lowered due to increased heat value and the arrangement of optical parts becomes inefficient
Solution Approach 1:
The red light source is divided into multiple independent red light emitting elements arranged in an array. By controlling individual elements or groups of elements, the system can achieve high luminance output without requiring a single oversized light source, thereby maintaining luminous efficiency while avoiding excessive heat generation from oversized components.
Solution Approach 2:
The system dynamically controls the number and combination of red light emitting elements that are activated based on the required luminance level. This dynamic adjustment allows the system to optimize between brightness output and energy efficiency, activating only the necessary number of elements to achieve the desired image brightness without wasting energy on excessive output.
2Adaptability or versatility
If the luminance of the red wavelength component is increased to improve brightness and color balance adjustment range, then the extent of brightness and color balance adjustment is improved, but the heat value increases and luminous efficiency decreases
Solution Approach 1:
The red light source is segmented into multiple controllable emitting elements, allowing independent or grouped activation. This segmentation enables fine-grained control over the total red wavelength luminance output, providing extensive adjustability for brightness and color balance while maintaining energy efficiency by activating only the necessary number of elements.
Solution Approach 2:
The system changes the operational parameters by varying the number of active red light emitting elements and their individual intensities. This parameter control provides a wide adjustment range for red wavelength luminance, enabling extensive brightness and color balance adjustment without requiring maximum power output from all elements simultaneously, thus preserving luminous efficiency.
3Adaptability or versatility
If a single red light source is used, then the device complexity is reduced, but the extent of brightness and color balance adjustment becomes narrow
Solution Approach 1:
The red light source is divided into multiple emitting elements arranged in an array, with each element controllable independently or in groups. This segmentation provides extensive adjustment capability for brightness and color balance by varying the number and intensity of active elements, while the modular array structure manages the complexity through systematic organization of the multiple elements.
Solution Approach 2:
The array of red light emitting elements serves multiple functions: it can operate with different numbers of elements active to adjust overall luminance, can control individual elements for fine-tuned color balance adjustment, and can potentially activate different subsets of elements for various optical path configurations. This multi-functionality provides extensive adjustment range while the unified array structure manages device complexity.
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 image brightness and color balance by controlling the intensity of light sources, enhancing color purity and brightness in the red wavelength range while maintaining efficient optical arrangements.
Implementation Method 1
a luminescent material layer which receives a laser beam as excitation light to generate light in a green wavelength range
Implementation Method 2
a first dichroic mirror which reflects light in a red wavelength range and transmits light in other wavelength ranges, and a second dichroic mirror which transmits light in a blue wavelength range and reflects light in other wavelength ranges
Data Source
AI summary
A light source unit has a first light source for emitting light in a first wavelength range, a second light source for emitting light in a second wavelength range of the same color system as the light in the first wavelength range and having a different wavelength, a third light source including light emitting elements for emitting light in a third wavelength range different from the light in the first wavelength range and in the second wavelength range, a fourth light source for emitting light in a fourth wavelength range excited by the light in the third wavelength range as luminous light, and a control unit for controlling the illumination of the first, second, third and fourth light sources, and the control unit controls the number of light emitting elements of the third light source to be illuminated according to illuminated states of the first and second light sources.