Light Source Device Synchronization Control for Color Balance
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Solution Overview
Problem
Existing light source devices face challenges in securing sufficient brightness for image formation, particularly in ensuring color balance across the entire projection image due to physical restrictions on the emission time of the fluorescence wheel, leading to potential color imbalance.
Innovation Solution
A light source device comprising a first light emitting element, a fluorescence wheel, a second light emitting element, a combining unit, and a color wheel, where a CPU performs time-division emission control and synchronization control to combine and shift the synchronization position of the color wheel with respect to the fluorescence wheel, optimizing the emission of different wavelength bands to enhance color balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If phosphor layers are provided on the fluorescence wheel, then the emission time of fluorescence can be extended, but the brightness for image forming is insufficient for some colors
Solution Approach 1:
The patent divides the light source system into multiple independent light emitting elements (first light emitting element for blue light, second light emitting element for red light) that operate in parallel. The fluorescence wheel is segmented into multiple light source segments (green phosphor layer, yellow phosphor layer, red phosphor layer, and blue transmission region) that can be independently controlled. This segmentation allows different wavelength bands to be emitted at different timings, resolving the contradiction between extending fluorescence emission time and maintaining sufficient brightness for each color.
Solution Approach 2:
The patent implements periodic action through time-division emission control where the first and second light emitting elements are alternately activated in synchronization with the rotation of the fluorescence wheel and color wheel. The CPU controls the light emitting elements to emit light in periodic cycles corresponding to the rotational periods of the wheels, ensuring that each color (blue, green, red) receives adequate illumination intensity during its designated emission period while maintaining overall color balance across the projection image.
2Stability of the object's composition
If synchronization control is performed on the fluorescence wheel and color wheel, then color balance can be improved, but the device complexity increases
Solution Approach 1:
The patent merges the control of multiple components (first light emitting element, second light emitting element, fluorescence wheel, and color wheel) into a unified synchronization control system managed by a single CPU. The CPU integrates the control logic to coordinate the rotation of both wheels and the activation timing of both light emitting elements based on a common reference signal. This merging approach maintains stable color balance by ensuring that blue light from the first light emitting element, green light from the fluorescence wheel, and red light from the second light emitting element are emitted in proper temporal and spatial relationship, while avoiding the complexity of separate independent control systems.
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 effectively improves color balance and brightness by implementing time-division emission and synchronization control, ensuring consistent and balanced color reproduction across the projection image.
Implementation Method 1
a fluorescence wheel including a fluorescence emission region with which fluorescence excited by the first wavelength band light is emitted as second wavelength band light
Data Source
AI summary
A light source device includes: a first light emitting element that emits first wavelength band light; a fluorescence wheel including a fluorescence emission region with which fluorescence excited by the first wavelength band light is emitted as second wavelength band light; a second light emitting element that emits third wavelength band light; a combining unit that combines the first wavelength band light, the second wavelength band light, and the third wavelength band light; a color wheel; and a CPU that controls the first light emitting element, the second light emitting element, the fluorescence wheel, and the color wheel, wherein the CPU performs synchronization control on the fluorescence wheel and the color wheel, and performs control to shift a synchronization position of the color wheel with respect to the fluorescence wheel in accordance with an output mode.