Segmented Color Wheel with Dual-Side Coatings for Projectors
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Solution Overview
Problem
Existing color wheel projectors face challenges with increased complexity and production costs due to the number of components and difficulty in fixing filter pieces securely at high rotational speeds, as well as limited color reproduction characteristics when using complementary colors like magenta, yellow, and cyan.
Innovation Solution
A color wheel design with segment areas where one side has a coating for transmitting complementary colors and the other side has a coating for transmitting primary colors, allowing for efficient light transmission and reduced component complexity, enabling increased color reproduction without increasing the number of components or rotational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of filter pieces is increased to enhance color reproduction characteristics, then color reproduction characteristics are improved, but the number of components increases and production costs increase
Solution Approach 1:
The color wheel is divided into multiple segment areas, with each segment containing multiple coating areas. Each coating area has a different wavelength band transmission characteristic, allowing a single filter piece to provide multiple color functions that would traditionally require separate filter pieces.
Solution Approach 2:
Different regions of the same filter piece are assigned different optical properties through selective coating application. Specifically, different coating areas within each segment have different wavelength band transmission characteristics, enabling localized functional differentiation without increasing the number of components.
2Adaptability or versatility
If the number of filter pieces is increased to enhance color reproduction characteristics, then color reproduction characteristics are improved, but manufacturing complexity and production costs increase
Solution Approach 1:
The color wheel is divided into multiple segment areas, with each segment containing multiple coating areas. Each coating area has a different wavelength band transmission characteristic, allowing a single filter piece to provide multiple color functions that would traditionally require separate filter pieces.
Solution Approach 2:
Different regions of the same filter piece are assigned different optical properties through selective coating application. Specifically, different coating areas within each segment have different wavelength band transmission characteristics, enabling localized functional differentiation without increasing the number of components.
3Adaptability or versatility
If the number of filter pieces is increased to enhance color reproduction characteristics, then color reproduction characteristics are improved, but fixing the filter pieces securely becomes more difficult at high rotational speeds
Solution Approach 1:
The color wheel is divided into multiple segment areas, with each segment containing multiple coating areas. Each coating area has a different wavelength band transmission characteristic, allowing a single filter piece to provide multiple color functions that would traditionally require separate filter pieces.
Solution Approach 2:
Multiple filter functions are merged into a single integrated color wheel structure. By combining multiple coating areas with different wavelength transmission characteristics into one rotating component, the invention eliminates the need for multiple separate filter pieces, thereby simplifying the fixing structure and improving reliability at high rotational speeds.
4Speed
If a reflection mirror is added to return light beams for re-passage through filter pieces, then color division speed is increased, but the optical system configuration becomes more complex
Solution Approach 1:
The color wheel rotates at high speed to periodically present different wavelength band transmission characteristics to the light beam. This periodic rotation enables time-division color separation, achieving high color division speed without requiring additional optical components like reflection mirrors.
Solution Approach 2:
The invention replaces the optical reflection mechanism with a rotational mechanical system. Instead of using a reflection mirror to redirect light beams for re-passage, the color wheel itself rotates to sequentially present different filtering functions, simplifying the optical system configuration while maintaining high color division speed.
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 enhances color reproduction characteristics by allowing for the transmission of six colors without increasing production costs or complexity, while ensuring the filter pieces can withstand high-speed rotations securely.
Implementation Method 1
a coating for transmitting light of a wavelength band of one complementary color is applied to one side and a coating for transmitting light of a wavelength band of one primary color is applied to part of the other side
Data Source
AI summary
A projector includes a light source unit for emitting white light, a color wheel, a display device, a cooling fan, a light source side optical system for guiding light from the light source unit to the display device, a projection side optical system for projecting an image emitted from the display device onto a screen and a projector control unit for controlling the light source and the display device, wherein the color wheel has a plurality of segment areas, and on each segment area, a coating which transmits light of a wavelength band of a complementary color is applied to one side, while a coating which transmits light of a wavelength band of a primary color is applied to part of the other side.