Projection System Controller Timing for Field Sequential Color
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Solution Overview
Problem
Existing projection systems using field sequential color display methods face issues with brightness reduction and color mixing due to poor responsiveness of light modulation elements, which are not adequately addressed by existing technologies.
Innovation Solution
A projection system with a light source that outputs multiple colors, a display panel with a light modulation element for each pixel, and a controller that controls light output in a time-axis direction, specifically adjusting light output in a stepwise manner based on the responsiveness of the liquid crystal panel to prevent color mixing and enhance brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If field sequential color display method is used, then brightness of projected image is improved, but color mixing occurs due to poor responsiveness of light modulation element
Solution Approach 1:
The light source is controlled to emit light in advance before the light modulation element completes its switching action. By timing the light emission to precede the modulation element's response, the system ensures that light is only emitted when the element is ready to modulate it properly, preventing color mixing while maintaining brightness
Solution Approach 2:
The light source control is made dynamic and adaptive based on the actual responsiveness of the light modulation element. The system adjusts the timing and duration of light emission in real-time according to the element's switching speed, allowing optimization of both brightness and color separation without fixed parameters
2Illumination intensity
If light source control is performed in stepwise manner, then brightness is improved, but color mixing of adjacent colors occurs
Solution Approach 1:
The system incorporates feedback from the light modulation element's actual response to control the light source timing. By monitoring when the element actually switches states and using this information to adjust subsequent light emission, the system achieves precise color separation while maintaining high brightness through optimized light utilization
Data Source
AI summary
There is provided a projection system that includes a light source, a display panel, a projection optical system, and a controller. The light source outputs light of a plurality of colors. The display panel includes a light modulation element provided for each pixel, and modulates the light outputted from the light source. The projection optical system projects light having passed through the display panel, and the controller controls light output of each color of the light source in a time-axis direction. This configuration is adopted to achieve an improvement in brightness of a projected image/a screen and prevention of color mixing in field sequential driving.