Projector Light Brightness Correction via Temperature Feedback
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Solution Overview
Problem
Projectors using solid-state light sources face issues with maintaining desired image brightness due to light source deterioration, leading to discrepancies in brightness and color accuracy.
Innovation Solution
Incorporating a light detector and adjuster system that corrects light brightness information based on temperature and light state information, allowing for precise adjustment of the light source output to maintain desired image brightness, even with changes in light source characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a solid-state light source is used in the projector, then the projector can be developed with improved efficiency and longevity, but the brightness of the displayed image deviates from the desired brightness due to light source deterioration
Solution Approach 1:
The patent implements a feedback control system where a light detector continuously monitors the actual light output from the solid-state light source. The controller compares the detected brightness with the desired brightness level and automatically adjusts the light source output or compensates through imaging processing to maintain accurate image brightness, thereby resolving the contradiction between extended light source life and brightness accuracy
Solution Approach 2:
The patent changes the operating parameters of the solid-state light source dynamically based on detected light output characteristics. By adjusting electrical parameters such as current or voltage to the light source, or modifying imaging parameters like gain or exposure, the system compensates for light source deterioration and maintains desired brightness levels throughout the light source's extended operational life
2Measurement precision
If the light source output is adjusted to compensate for deterioration, then brightness accuracy improves, but the system complexity increases due to additional detection and control components
Solution Approach 1:
The patent integrates the light detector and control functions into existing system components, making them multi-functional. The detector serves both as a safety monitor and a brightness calibration device, while the controller handles both general system control and light output compensation, thereby improving brightness measurement accuracy without proportionally increasing overall system complexity
3Manufacturing precision
If temperature information is used to correct light brightness information, then the precision of light output adjustment improves, but the device complexity increases due to additional temperature detection components
Solution Approach 1:
The patent introduces temperature detection as an intermediary measurement that indirectly informs light output correction. By monitoring temperature changes that correlate with light source characteristics and deterioration, the system uses temperature data as a mediator to predict and compensate for brightness deviations, improving adjustment precision while adding only a simple temperature sensing component rather than complex direct measurement systems
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
The system ensures that the projector displays images with brightness close to the desired level by accurately adjusting the light output, improving precision and maintaining color accuracy despite light source deterioration.
Implementation Method 1
a light detector that detects light brightness information on brightness of light emitted from a light source
Implementation Method 2
the adjuster corrects the light brightness information detected with the light detector based on temperature information detected with the temperature detector
Data Source
AI summary
A projector includes a light detector that detects light brightness information on the brightness of light emitted from a light source and an adjuster that corrects the light brightness information detected with the light detector and adjusts the output from the light source based on the corrected light brightness information.