Projector White Balance Control via Dynamic Power Adjustment
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Solution Overview
Problem
Existing projector technologies face challenges in maintaining consistent white balance when adjusting the electric power supplied to solid-state light sources, leading to undesirable changes in light emission.
Innovation Solution
A projector system that includes a solid-state light source, an electric power controller to adjust power based on usage period and brightness, and a white balance controller to determine and adjust white balance parameters, using PWM or current control to maintain stable light output and extend light emitter life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If electric power to the solid-state light source is adjusted to change light emission amount, then light output is improved, but white balance changes undesirably
Solution Approach 1:
The patent applies parameter changes by adjusting the electric power supplied to the solid-state light source based on its usage period and luminous flux output. The controller dynamically modifies power parameters (voltage/current) to maintain optimal white balance while accounting for the light source's degradation over time. This resolves the contradiction by changing the power parameters adaptively rather than keeping them fixed, thereby maintaining both light output and white balance stability.
2Illumination intensity
If electric power is increased to maintain light output, then illumination intensity is improved, but life of the light emitter decreases
Solution Approach 1:
The patent implements dynamics by continuously monitoring the usage period of the solid-state light source and dynamically adjusting the electric power supply accordingly. The controller adapts the power level based on real-time conditions, increasing power only when necessary to maintain light output while extending the overall lifespan of the light emitter. This dynamic adjustment strategy resolves the contradiction between maintaining illumination intensity and prolonging device life.
3Stability of the object's composition
If white balance adjustment is performed frequently, then white balance stability is improved, but device complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the controller monitors the usage period and luminous flux of the solid-state light source, then adjusts electric power accordingly. This closed-loop feedback system maintains white balance stability by automatically compensating for light source degradation without requiring complex manual intervention or additional hardware components. The feedback-based approach resolves the contradiction by achieving white balance stability through intelligent control rather than increased device complexity.
Data Source
AI summary
A projector that modulates light emitted by a light source unit and projects a resultant image includes the light source unit, which includes an array light source and a first retardation film that adjusts the white balance of the light emitted by the array light source, an electric power controller that adjusts electric power to be supplied to the array light source in accordance with the period for which the light source unit was used, and a white balance controller that determines an adjustment parameter used to adjust the white balance of the light emitted by the light source unit and corresponding to the adjustment made by the electric power controller and causes the first retardation film to adjust the white balance based on the determined adjustment parameter.