Dynamic Light Beam Proportion Control for White Balance Stability
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Solution Overview
Problem
Conventional projection systems require replacing the phosphor color wheel to maintain white balance, leading to increased costs and operational difficulties due to the aging of phosphors at different rates, causing drift in primary color light proportions.
Innovation Solution
A light source system with a switching system that divides the light into multiple beams with preset proportions, using color wheels on each path to generate and adjust color lights, allowing for modulation and combination to form a projection image, with a controller adjusting beam durations or intensities based on image parameters to maintain white balance without replacing the color wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the phosphor color wheel is used with fixed angular ranges for different color segments, then the initial white balance can be achieved, but the white balance drifts over time due to differential aging of phosphors
Solution Approach 1:
The patent introduces a dynamic control system that adjusts the duration of light beams passing through different color segments of the phosphor color wheel. By varying the beam duration for each color segment based on detected color temperature, the system dynamically compensates for phosphor aging effects without requiring mechanical replacement of the color wheel, thus resolving the contradiction between reliability and device complexity
Solution Approach 2:
The system employs a feedback mechanism where a sensor detects the color temperature of the projected light, and this information is fed back to a controller that adjusts the beam duration for each color segment. This closed-loop feedback system automatically corrects white balance drift caused by phosphor aging, eliminating the need for manual color wheel replacement and improving reliability
2Manufacturing precision
If the angular ranges of phosphor coating are fixed to achieve white balance, then color accuracy is maintained initially, but operation difficulty increases due to required color wheel replacement
Solution Approach 1:
The system implements self-service operation through automatic white balance adjustment. The control system autonomously detects color temperature deviations and adjusts beam durations for different color segments without user intervention, eliminating the need for operators to manually replace color wheels and significantly improving ease of operation while maintaining color accuracy
3Reliability
If color wheel replacement is required to restore white balance, then color stability is maintained, but cost increases
Solution Approach 1:
The patent replaces the mechanical solution of color wheel replacement with an electronic control system that adjusts beam durations digitally. This substitution eliminates the need for physical replacement of optical components, reducing system cost while maintaining color stability through software-based compensation for phosphor aging
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
Enables dynamic adjustment of color light proportions to maintain proper white balance, eliminating the need for color wheel replacement, thus reducing costs and operational complexity.
Implementation Method 1
the first, second and third segments R, G and B of the phosphor color wheel 102 absorb the excitation light to sequentially generate three primary color lights, e.g., red, green and blue
Data Source
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AI summary
A light source system and a projection system, comprising a light source (30); a switching system (40,60) switching light emitted by the light source (30) into at least two light beams (λ1, λ2, λ3, λ4) having a preset proportion in the manner of time division or light intensity division; a color wheel assembly (50, 70) located in a transmission light path of each light beam of the at least two light beams (λ1, λ2, λ3, λ4), with the color wheel assembly (50, 70) generating light having different colors and a preset proportion under the irradiation of each light beam of the at least two light beams (λ1, λ2, λ3, λ4), and light of different colors being able to synthesize a projection image after being modulated by a light modulation system, wherein the switching system (40, 60) can adjust the proportion of the at least two light beams (λ1, λ2, λ3, λ4) according to the parameters of the projection image, so as to adjust the proportion of the light of different colors. Once an offset of a white balance occurs on the projection image, the proportion of light beams of different colors can be adjusted by adjusting the proportion of the switched light beams, so as to achieve the white balance again, so that it is not necessary to replace same with a new color wheel, thereby solving the problems of relatively high costs and relatively large usage difficulty of the projection system.