Laser Lighting Color Correction via Temporal Modulation
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Solution Overview
Problem
Traditional cinema projection systems using xenon lights have short service lives and require frequent replacements, while laser light sources with different wavelengths and output tolerances complicate color correction, often sacrificing brightness in achieving color standards.
Innovation Solution
A lighting system comprising a first and second laser set, a wavelength conversion device, and a light-combining assembly, where the driving assembly controls the emission of primary lights at different timings to adjust and combine them, ensuring the first base color meets a preset color standard without compromising brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If white balance correction is achieved by reducing the light output of the green-light spatial light modulator, then the white light color coordinates approach the standard white light coordinate point, but the output brightness of the projector is sacrificed
Solution Approach 1:
The patent transitions from spatial light modulation to temporal light modulation, using time-sequential switching of laser diodes to achieve color correction without sacrificing brightness. This dimensional change from space to time allows independent control of color components while maintaining overall luminance.
Solution Approach 2:
The patent employs periodic switching of different laser diodes (blue, green, red) in time-sequential intervals to generate the three primary colors. This periodic action allows each laser to operate at full power during its designated time slot, achieving accurate color coordinates without reducing overall brightness.
2Reliability
If different lasers with different wavelengths and output tolerances are used, then the laser light source provides advantages in color and service life, but the three base colors and white balance displayed by the projector become different, requiring complex adjustment
Solution Approach 1:
The patent uses dynamic current adjustment of each laser diode through independent driving circuits, allowing real-time optimization of output intensity for each laser. This dynamic control compensates for manufacturing tolerances and wavelength variations, simplifying the color correction process while maintaining high reliability.
Solution Approach 2:
The patent changes the electrical current parameters supplied to each laser diode to compensate for individual variations in wavelength and output tolerance. By adjusting the driving current of each laser independently, the system achieves consistent color output across different laser units without complex mechanical adjustments.
3Device complexity
If a two-chip spatial light modulator is adopted, then the system structure is simplified, but the time for modulating each base color is greatly shortened, affecting gray scale and sacrificing brightness
Solution Approach 1:
The patent replaces the mechanical two-chip spatial light modulator system with an electrical control system using multiple laser diodes and time-sequential switching. This substitution eliminates the need for physical light modulation through mechanical components, achieving faster color switching without sacrificing brightness or gray scale quality.
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 effectively corrects color coordinates to meet color standards without sacrificing brightness, improving the efficiency and accuracy of color calibration in projection systems.
Implementation Method 1
a wavelength conversion device configured to convert the first primary light into converted light in the second timing
Data Source
AI summary
Disclosed are a color correction method for a lighting system and a lighting system, the lighting system includes a first laser set (10), a second laser set (20), a driving assembly (30), a wavelength conversion device (40), and a light-combining assembly (50), where the first laser set (10) is used for emitting first primary light; the second laser set (20) is used for emitting second primary light; the driving assembly (30) is used for driving the first laser set (10) to emit the first primary light in a first timing sequence and a second timing sequence, and driving the second laser set (20) to emit the second primary light in the first timing sequence and the second timing sequence; the wavelength conversion device (40) is used for converting the first primary light into converted light in the second timing sequence; and the light-combining assembly (50) is used for combining the first primary light and the second primary light in the first timing sequence, and combining the second primary light and the converted light in the second timing sequence. By means of the above method, the first primary light and the second primary light are combined, such that correction of the first primary light is realized to enable the first primary light to meet a preset color standard.