Projector Color Wheel Segmentation for Light Source Compensation
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Solution Overview
Problem
Conventional projectors experience color shift in display images due to deviations in the light color emitted by the light source, primarily caused by design and manufacturing issues, leading to inconsistent image projection.
Innovation Solution
A projector design incorporating a first and second light source, along with a color wheel featuring transparent and phosphor reflection regions, where the first light source's color is adjusted by the color wheel to create a third color, and the second light source's color is mixed with the third color to generate non-overlapping projecting lights, ensuring accurate color compensation and projection timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single light source is used in conventional projectors, then the device complexity is reduced, but color accuracy deteriorates due to light color deviation and color shift in display images
Solution Approach 1:
The single light source is segmented into two separate light sources (first light source and second light source), each emitting different color lights. This segmentation allows independent control and optimization of each light source's color output, thereby improving overall color accuracy while managing device complexity through modular design
Solution Approach 2:
Different regions of the optical system are assigned different light sources with specific color characteristics. The first light source emits a first color light and the second light source emits a second color light, with each light source optimized for its specific function. This local quality approach ensures that each part of the system contributes to overall color accuracy
2Manufacturing precision
If color wheel with phosphor reflection region is used to convert light color, then color shift is compensated, but the device complexity increases due to additional optical components and timing control requirements
Solution Approach 1:
The color wheel serves multiple functions: it acts as both a light modulator and a color conversion element. The transparent region allows direct light passage while the phosphor reflection region converts light color, enabling the single color wheel to perform both color compensation and light modulation functions, thereby managing device complexity
Solution Approach 2:
The color wheel acts as an intermediary element between the two light sources and the projecting system. It mediates the interaction between different color lights by selectively reflecting or transmitting light based on its regions, enabling color compensation without requiring direct complex interaction between light sources
3Illumination intensity
If two light sources emit simultaneously, then the brightness is increased, but color accuracy deteriorates due to light color overlap and interference
Solution Approach 1:
The two light sources emit light in periodic, non-overlapping time intervals rather than simultaneously. The first light source emits during its designated time slot and the second light source emits during its own time slot, controlled by the rotating color wheel. This periodic action prevents color interference while maintaining overall brightness through temporal multiplexing
Solution Approach 2:
The system dynamically controls the emission timing of the two light sources based on the rotation position of the color wheel. The light sources are activated in sequence rather than statically simultaneously, with their emission timing dynamically adjusted to match the transparent and phosphor reflection regions passing through the optical path, preventing color overlap
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 compensates for color deviations, ensuring that the projected light maintains an expected color by mixing the second color light with the adjusted first color light, thereby preventing overlap and enhancing image quality.
Implementation Method 1
the first color light reflected by at least one phosphor reflection region of the color wheel becomes a fourth color light
Implementation Method 2
the first color light passing through at least one transparent region of the color wheel becomes a third color light
Implementation Method 3
the first color light reflected by at least one phosphor reflection region of the color wheel becomes a fourth color light
Data Source
AI summary
A projector and a projecting method using the same are provided. The projector includes a first light source, a color wheel and a second light source. The first light source is configured to emit a first color light. The second light source is configured to emit a second color light. The first color light passing through a transparent region of the color wheel becomes a third color light. The second color light and the third color light are mixed as a first projecting light. The first color light reflected by a phosphor reflection region of the color wheel becomes a fourth color light. The fourth color light is guided toward a projecting direction to become a second projecting light. The first projecting light and the second projecting light do not overlap in timing.