Supplementary Light Source Control for Laser Fluorescent Projection
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Solution Overview
Problem
The existing laser fluorescence white light source systems for DLP projection have a low utilization rate for supplementary red light sources, leading to increased costs without significant brightness improvement due to the supplementary light being only active during specific segments of the color wheel rotation.
Innovation Solution
A light source system with a wavelength conversion device having primary and mixed color regions, where a supplementary light source is controlled to be on during multiple time periods, including when primary color regions and the mixed color region receive the laser, enhancing the utilization and luminous flux of the supplementary light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the supplementary light source is only turned on when the red segment of the fluorescent color wheel is irradiated by excitation light, then the color accuracy is maintained, but the utilization rate of the supplementary light source becomes very low and the cost increases without proper contribution to brightness improvement
Solution Approach 1:
The patent pre-calculates and pre-arranges the timing schedule for the supplementary light source activation. By determining in advance which time periods (including red segment, yellow segment, and cyan segment) should activate the supplementary light source, the system ensures color accuracy is maintained while maximizing the utilization rate. This preliminary planning allows the supplementary light source to be activated during multiple segments rather than just one, improving overall contribution to brightness without compromising color fidelity.
2Productivity
If the supplementary light source is activated during multiple time periods including mixed color light region, then the utilization rate and luminous flux are improved, but the control complexity increases
Solution Approach 1:
The patent divides the color wheel rotation into distinct time periods corresponding to different color segments (red, yellow, cyan, etc.). The control system independently manages the supplementary light source activation for each segment based on pre-determined criteria. This segmentation approach allows the complex multi-segment activation strategy to be broken down into manageable, independent control decisions for each time period, reducing overall control complexity while maintaining high utilization rate.
3Reliability
If the ratio of three colors R, G and B in the segment-type color wheel is fixed to meet white field color requirements, then the color quality is maintained, but the brightness of red light cannot be sufficiently improved
Solution Approach 1:
The patent extends the activation period of the supplementary red light source from a single red segment to multiple continuous and discontinuous time periods throughout the color wheel rotation (including red, yellow, and cyan segments). This continuous utilization ensures that the supplementary red light contributes to brightness enhancement across multiple color regions while the main color wheel maintains its fixed RGB ratios for white field color quality. The overlapping activation periods ensure color balance is preserved while maximizing red light brightness contribution.
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 approach significantly increases the brightness and utilization rate of the supplementary light source, improving the overall luminous flux and color quality of the light source system by extending the operational time of the supplementary light source beyond its initial limited activation periods.
Implementation Method 1
a wavelength conversion device located in an optical path of the first laser and configured to receive the first laser and emit second light
Data Source
AI summary
A light source system includes a first light source emitting first laser; a wavelength conversion device; a driver device driving the wavelength conversion device to move in such a manner that regions of the wavelength conversion device sequentially and periodically receive the first laser; a second light source emitting supplementary light consistent in color with light emitted by one primary color light region; a control device controlling on and off of the second light source, the control device controlling the second light source to be on in at least two of: every time period during which a primary color light region of a same color is receiving the first laser, every time period during which the mixed color light region is receiving the first laser, and some time periods during which a primary color light region of a different color is receiving the first laser.