Projector Light Source Synchronization for Color Balance
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Solution Overview
Problem
Projectors using lamp light sources face issues with short lifespan and color balance degradation due to shifts in light ratios between blue light and fluorescence output, affecting image quality.
Innovation Solution
A projector design incorporating a first and second liquid crystal panel and a light source device with a solid light source and wavelength conversion element, where the ratio of output periods of colored lights is synchronized to match the frame rate, and the output intensity of the solid light source is adjusted based on the ratio of output periods to maintain color balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lamp light source is used to emit colored light, then the projector can display images with good color balance, but the lifespan of the light source becomes short
Solution Approach 1:
The patent changes the fundamental parameters of the light source system by transitioning from a lamp-based broad-spectrum light source to a solid-state light source with wavelength conversion elements. This involves changing the emission mechanism, spectral composition, and temporal characteristics of the light output to achieve both long lifespan and stable color balance.
Solution Approach 2:
The patent segments the light generation process into distinct functional components: a blue light emitting solid-state light source, a wavelength conversion element for generating green and red light, and separate liquid crystal panels for processing different color components. This segmentation allows independent optimization of each component's performance and lifespan.
2Reliability
If blue light and fluorescence are output in time series to convert into image light in liquid crystal panels, then the projector can use solid light sources with long lifespan, but the color balance degrades due to shift in light amount ratio
Solution Approach 1:
The patent implements periodic action by outputting blue light and converted light (green and red) in alternating time periods to the liquid crystal panels. The control device manages these periodic outputs and synchronizes them with the frame rate, ensuring that the temporal distribution of different color lights maintains proper color balance while enabling the use of long-lived solid-state light sources.
Solution Approach 2:
The control device monitors and adjusts the light amount ratios of blue light and converted light based on the output periods and frame rate requirements. This feedback mechanism ensures that color balance is maintained despite the time-division multiplexing of different color components.
3Reliability
If colored light is converted into image light in time series in at least one liquid crystal panel, then the projector can use solid light sources, but the color balance degrades due to mismatch between light amount ratio and output period ratio
Solution Approach 1:
The patent applies dynamics by making the light output system adaptable and adjustable. The control device dynamically controls the output intensity and timing of blue light and converted light based on real-time requirements, allowing the system to optimize color balance under different operating conditions while maintaining the benefits of solid-state light sources.
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 ensures stable and balanced color output, preventing color mixture and enhancing image quality by synchronizing the output periods of blue, green, and red lights, thus extending the lifespan of the projector.
Implementation Method 1
a wavelength conversion element configured to wavelength-convert excitation light into converted light including the second colored light and the third colored light
Data Source
AI summary
A projector the present disclosure includes: a first liquid crystal panel output image light of a first color and image light of a second color in time series; a second liquid crystal panel output image light of a third color; and a light source devicesupplied first colored light, second colored light, and third colored light, and having a solid light source emitted the first colored light and a wavelength conversion element. A ratio between output periods of the first colored light and the converted light is the same as a ratio between output periods of the image light of the first color and the image light of the second color at a frame rate, and an output intensity of the first colored light is set according to an output intensity of the converted light based on the ratio between the output periods of the first colored light and the converted light.