Rotating Fluorescent Plate Synchronization for Projection Flicker
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Solution Overview
Problem
The unevenness of the fluorescent layer in projection apparatuses leads to temporal variations in green light intensity, causing flickering and instability in projection images.
Innovation Solution
A light source unit that includes an excitation light source, a fluorescent plate with a fluorescence emission region on a circular substrate, and a drive unit that rotates the fluorescent plate, with a control unit synchronizing the display frequency of the display element and the rotation frequency of the fluorescent plate to maintain image stability through the formula j×display frequency=k×rotation frequency (j, k are integers, j>k).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fluorescent plate with a fluorescent layer is used to convert blue light into green light, then green light is generated for projection, but the unevenness of the fluorescent layer causes temporal variations in green light intensity leading to flickering
Solution Approach 1:
The fluorescent plate is rotated at a specific frequency that is synchronized with the display frequency of the display element. By controlling the rotation frequency to satisfy the relationship j×display frequency=k×rotation frequency (where j and k are integers and j>k), the system creates a periodic action that ensures the uneven fluorescent layer presents consistent average characteristics to the excitation light source over each display cycle, thereby eliminating temporal variations in green light intensity and preventing flickering
Solution Approach 2:
The invention transitions from a static fluorescent plate to a dynamically rotating one. The rotation introduces temporal variation in the position of the fluorescent layer, allowing the system to average out the unevenness over time. The dynamic rotation enables the uneven fluorescent layer to present different sections to the excitation light during different phases of rotation, and through proper frequency synchronization, this dynamic behavior results in stable green light 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
This solution effectively controls the influence of fluorescent layer unevenness, stabilizing the projection image by ensuring consistent green light intensity and reducing flickering.
Implementation Method 1
a fluorescent plate having a fluorescent layer (fluorescence emission region) which converts the blue light into green light by the blue light being emitted toward the fluorescent layer from the excitation light emission device
Data Source
AI summary
Disclosed is a light source unit which emits fluorescence light to a display element which displays an image by using the fluorescence light including an excitation light source which emits excitation light, a fluorescent plate including a fluorescence emission region on a surface of a circular substrate which emits the fluorescence light by the fluorescence emission region being irradiated with the excitation light from the excitation light source, a drive unit which rotates the fluorescent plate in a circumferential direction and a control unit which controls the excitation light source and the drive unit. And the control unit controls the drive unit so that a display frequency of the display element and a rotation frequency of the fluorescent plate fulfill formula (1)j×display frequency=k×rotation frequency (j, k are integers, j>k) (1).