Phosphor Disk Rotation Control for Projector Heat Management
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Solution Overview
Problem
Projectors using solid-state light sources with phosphor converters face challenges with heat generation, leading to reduced conversion efficiency and reliability, and require time for phosphor rotation to reach desired levels before solid-state light sources can be turned on, resulting in delayed start-up.
Innovation Solution
A projector design that includes a light source device with a rotating phosphor disk, where the excitation light source is turned on when the phosphor disk reaches a predetermined number of rotations, and output is increased as the rotations increase, allowing for quick start-up and reduced heat generation, thereby enhancing long-term reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the phosphor disk is rotated to reach the target number of rotations before turning on the solid-state light source, then the phosphor can handle high-output excitation light without local heat generation, but the start-up time of the projector increases
Solution Approach 1:
The phosphor disk is rotated in advance to reach a predetermined number of rotations before the solid-state light source is turned on. This preliminary rotation ensures that the phosphor is already at the required speed to dissipate heat effectively when high-output excitation light is applied, preventing local heat generation while enabling faster start-up than waiting for target rotations
Solution Approach 2:
The system dynamically adjusts the operating parameters based on the rotation speed of the phosphor disk. The solid-state light source is turned on at a predetermined rotation number (faster start-up) rather than waiting for the target rotation number, and the output is gradually increased as the disk continues to rotate, optimizing both start-up time and phosphor reliability
2Illumination intensity
If high-output excitation light is applied to the phosphor disk with small number of rotations, then the light quantity is sufficient, but local heat generation occurs and phosphor deterioration accelerates
Solution Approach 1:
The phosphor disk is pre-rotated to reach a predetermined number of rotations before applying high-output excitation light. This ensures the phosphor is already spinning fast enough to dissipate heat effectively, allowing sufficient light quantity to be produced without causing local heat generation or phosphor deterioration
Solution Approach 2:
The output of the solid-state light source is dynamically increased as the number of rotations of the phosphor disk increases. This dynamic adjustment ensures that high-output excitation light is only applied when the phosphor is rotating at sufficient speeds to handle the thermal load, maintaining both light quantity and phosphor reliability
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
This configuration enables rapid image display, reduces user wait time during start-up, and extends the lifespan of the phosphor by minimizing high-output excitation light exposure to the phosphor disk with fewer rotations, ensuring long-term reliability and high-speed start-up.
Implementation Method 1
a phosphor that converts the excitation light into fluorescence
Data Source
AI summary
A projector is provided which can secure long-term reliability and enable high-speed start-up through suppression of local heat generation of phosphor. The projector includes a light source device including an excitation light source emitting excitation light, a phosphor disk on which a phosphor that converts the excitation light into fluorescence is continuously formed in a circumferential direction of the phosphor disk, a motor unit rotating the phosphor disk in the circumferential direction, a light modulation device generating an image light through modulation of light including the fluorescence, and a projection optical system projecting the image light. If the number of rotations of the phosphor disk reaches a predetermined number that is smaller than a target number, the excitation light source is turned on, while if the number of rotations of the phosphor disk is increased after reaching the predetermined number, an output of the excitation light source is increased.