Projector Retardation Plate Rotation Control for Color Balance
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Solution Overview
Problem
Existing projector technologies face challenges in maintaining consistent color balance across various brightness settings due to changes in solid-state light source and phosphor characteristics over time, leading to variations in color balance for each brightness setting.
Innovation Solution
A projector system that includes a light-emitting element, a retardation plate, a polarization separation element, a phosphor, and a control unit to adjust the rotation angle of the retardation plate based on brightness information, allowing for dynamic adjustment of color balance across multiple brightness settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common rotation angle of the retardation plate is used for multiple brightness settings, then the device complexity is reduced, but the color balance varies for each brightness setting
Solution Approach 1:
The patent implements dynamic control of the retardation plate rotation angle based on the brightness setting. The control unit adjusts the rotation angle according to the selected brightness level, enabling the system to adapt to different operating conditions. This dynamic adjustment ensures consistent color balance across multiple brightness settings while maintaining reasonable control complexity through automated control logic.
2Reliability
If the rotation angle of the retardation plate is adjusted for each brightness setting, then the color balance consistency is improved, but the device complexity increases
Solution Approach 1:
The patent employs a control unit that receives brightness setting information and automatically adjusts the retardation plate rotation angle accordingly. This feedback-based control mechanism ensures that the appropriate rotation angle is applied for each brightness setting, maintaining color balance consistency. The automated control reduces manual intervention complexity while achieving reliable color balance across different brightness levels.
3Illumination intensity
If the brightness of the light-emitting element is increased, then the illumination intensity is improved, but the color balance may shift due to light source characteristics
Solution Approach 1:
The patent changes the rotation angle parameter of the retardation plate in response to brightness setting changes. By adjusting this optical parameter based on the brightness level, the system compensates for color balance shifts that occur at different illumination intensities. This parameter adjustment maintains color consistency across the full brightness range while allowing flexible illumination control.
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
Enables precise adjustment of color balance in accordance with brightness information, ensuring consistent color output regardless of changes in the light source or phosphor characteristics over time, and accommodating multiple brightness settings.
Implementation Method 1
a retardation plate that converts a portion of the light output from the light-emitting element into a second polarization state in accordance with a rotation angle of the retardation plate
Implementation Method 2
a polarization separation element that separates the light from the retardation plate into a first flux of light in the first polarization state and a second flux of light in a second polarization state
Implementation Method 3
a phosphor, excited by the first flux of light, which outputs a third flux of light of a second wavelength band different from the first wavelength band
Data Source
AI summary
A projector includes a light-emitting element that outputs light of a first wavelength band which is in a first polarization state; a retardation plate that converts a portion of the light into a second polarization state; a polarization separation element that separates the light into a first flux of light in the first polarization state and a second flux of light in a second polarization state; a phosphor, which outputs a third flux of light of a second wavelength band; an optical modulator that modulates the light in accordance with a video signal; a light-emitting element control unit that controls brightness of the light-emitting element in accordance with brightness information; and a retardation plate control unit that controls a rotation angle of the retardation plate in accordance with the brightness information.