Laser Projection Device Independent Color Control
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Solution Overview
Problem
Existing laser projection devices with a trichromatic laser source system face challenges in achieving ideal color effects due to high control requirements for the fluorescent wheel, leading to suboptimal color generation.
Innovation Solution
A laser projection device with a trichromatic laser source system that includes three laser assemblies emitting different colors, a display control circuit, power supply driving assemblies, and laser driving assemblies, allowing for independent control of each laser assembly through PWM signals and enabling signals to achieve precise light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fluorescent wheel is used to generate three-color light from blue laser, then the device structure is simplified, but the color effect and control precision deteriorate due to high control requirements
Solution Approach 1:
The patent divides the single blue laser source into three separate laser assemblies (red, green, blue) with independent control. Each laser assembly is controlled by separate PWM signals and enabling signals, allowing precise independent adjustment of each color channel to achieve ideal color effects without the complexity of a fluorescent wheel.
2Device complexity
If a fluorescent wheel is used to generate three-color light, then the device structure is simplified, but the control precision and color accuracy worsen
Solution Approach 1:
The system segments the color generation into three independent laser assemblies, each with dedicated control circuits. The display control circuit outputs separate PWM signals and enabling signals for each laser assembly, enabling precise control of color accuracy through independent adjustment of each laser's intensity and timing.
Solution Approach 2:
The patent uses PWM (pulse width modulation) signals to dynamically adjust the intensity parameters of each laser assembly. By varying the duty cycle of PWM signals and controlling the timing of enabling signals, the system achieves precise control over the brightness and color composition, thereby improving color accuracy.
3Manufacturing precision
If three separate laser assemblies are used to directly generate three-color light, then color accuracy and brightness improve, but the device complexity increases
Solution Approach 1:
The patent employs a universal control architecture where the display control circuit and power supply driving assemblies serve all three laser assemblies. The power supply driving assemblies are connected to all laser assemblies and can distribute power and control signals universally, reducing the overall system complexity despite having multiple laser components.
Solution Approach 2:
The patent merges the control functions for all three laser assemblies into a single display control circuit that generates PWM signals and enabling signals for all lasers. The power supply driving assemblies also serve as a shared component that distributes power to all laser assemblies, thereby consolidating control infrastructure and managing system complexity.
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 solution enables independent control of each laser assembly, improving color accuracy and brightness by directly generating three-color light, thus enhancing the overall color effect and brightness of the projection.
Implementation Method 1
a laser light source, including three laser assemblies emitting lasers of mutually different colors
Implementation Method 2
each of the power supply driving assemblies is configured to load a driving voltage to a corresponding one of the laser driving assemblies according to a voltage of a received PWM signal
Data Source
AI summary
A laser projection device includes: a laser light source, including three laser assemblies emitting lasers of different colors; a laser light source driving unit, including: a display control circuit; three power supply driving assemblies connected to the three laser assemblies; and three laser driving assemblies connected to three power supply driving assemblies, where the display control circuit is configured to transmit an enabling signal corresponding to each laser assembly to a corresponding power supply driving assembly when transmitting a PWM signal corresponding to the each laser assembly; each power supply driving assembly is configured to load a driving voltage to a corresponding laser driving assembly according to voltage of a received PWM signal, when a received enabling signal is at active potential; and each laser driving assembly is configured to drive a corresponding laser assembly to emit light according to the driving voltage.