Field Sequential Color Projector Light Emission Control
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Solution Overview
Problem
Field sequential color projectors face limitations in image quality due to fixed switch-on times for color lights, restricting the improvement of projected images.
Innovation Solution
A projector system with a storage unit for different light emission patterns, an acquiring unit to determine current projection conditions, and a controller to adjust the light emission of multiple colored LEDs based on stored data, allowing dynamic control of light emission patterns according to environmental luminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the switch-on time of each color light is fixed in a light emission period, then the light source operation is simple and stable, but the quality of the projected images cannot be improved further
Solution Approach 1:
The patent applies dynamics by making the light emission pattern variable rather than fixed. The control unit dynamically adjusts the light emission patterns of the red, green, and blue LEDs based on different projection conditions (indoor/outdoor environments, screen types). This allows the system to optimize image quality for different scenarios by changing duty ratios and emission timings, resolving the contradiction between fixed operation stability and image quality improvement.
Solution Approach 2:
The patent changes key parameters including duty ratios of each color LED, light emission timing, and intensity levels based on projection conditions. By storing multiple light emission patterns with different parameter settings and selecting appropriate patterns, the system improves image quality without requiring complex real-time calculations, thus managing device complexity while achieving better manufacturing precision in terms of image output.
2Manufacturing precision
If multiple different light emission patterns are stored and selected based on projection conditions, then image quality is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple light emission patterns in the storage unit before actual projection. These patterns are prepared in advance for different projection conditions (indoor dark environments, outdoor bright environments, different screen types). When projection begins, the control unit simply selects the appropriate pre-prepared pattern rather than calculating optimal parameters in real-time, thus improving color reproducibility while keeping device complexity manageable.
Solution Approach 2:
The system applies self-service by automatically detecting or determining the current projection condition and autonomously selecting the appropriate light emission pattern from stored patterns. This automatic selection process eliminates the need for manual configuration or complex real-time optimization algorithms, allowing the system to achieve good color reproducibility across different conditions without proportionally increasing control complexity.
3Illumination intensity
If the green LED switch-on time is extended to achieve white projected image, then white balance is improved, but the flexibility to optimize for different conditions is limited
Solution Approach 1:
The patent makes the green LED emission parameters dynamic rather than fixed. Instead of always extending the green LED switch-on time, the control unit adjusts the green LED duty ratio and timing based on the selected light emission pattern, which corresponds to different projection conditions. For example, in outdoor bright environments, the green emission may be extended more, while in indoor dark environments, it may be adjusted differently to maintain white balance while optimizing for those specific conditions, thus achieving both good white balance and adaptability.
Solution Approach 2:
The patent changes the green LED parameters (duty ratio, timing, intensity) along with red and blue LED parameters in coordinated fashion based on projection conditions. By storing multiple patterns with different parameter combinations, the system can achieve proper white balance in each condition without being constrained to a fixed green LED extension approach, thereby maintaining adaptability across various projection environments.
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 approach enhances image quality by adjusting light emission patterns to match environmental luminance, reducing contrast loss from external light and improving color reproducibility, while also reducing flicker and heat generation in LEDs.
Implementation Method 1
a light source of three different color (R, G and B) LEDs (Light Emitting Diodes) which are switched on sequentially in a time-divisional manner
Data Source
AI summary
A projector has a storage unit storing data on a plurality of different light emission patterns each occurring in a period based on a plurality of different-colored lights, wherein each light emission pattern corresponds to a respective one of a plurality of different projection conditions of a color image. An acquiring unit acquires a present projection condition of the color image, and a controller controls a light emission operation of the plurality of different-colored light emitting elements in the period in accordance with data on a light emission pattern corresponding to the present projection condition of the color image.