Laser Unit Control Circuit for Faster Projector Startup
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Solution Overview
Problem
The start-up speed of laser units in laser projection apparatuses is slow due to the low efficiency of existing laser unit control circuits, affecting the display performance.
Innovation Solution
Implementing a laser unit control circuit that outputs a first control signal at a constant level during startup to rapidly charge energy storage elements, followed by a PWM signal when the power supply reaches a reference value, enhancing the illumination speed of laser units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a PWM signal is used to control the switching tube from the beginning, then the circuit structure is simple, but the start-up speed of the laser unit is slow
Solution Approach 1:
The controller outputs a constant-level signal before the power supply signal reaches the reference value to preliminarily charge the energy storage element, preparing the system for faster subsequent operation. This preliminary charging action reduces the start-up time when the laser unit needs to activate.
Solution Approach 2:
The control signal dynamically switches between constant-level signal and PWM signal based on the power supply status. When the power supply signal reaches the reference value, the controller transitions to PWM mode for brightness control, optimizing both start-up speed and energy efficiency.
2Duration of action of moving object
If the energy storage element is charged slowly, then the circuit operates stably, but the illumination speed of the laser unit is reduced
Solution Approach 1:
The constant-level signal preliminarily charges the energy storage element to a reference value before normal operation, ensuring that when the laser unit needs to illuminate, the energy is already prepared, thus improving illumination speed without compromising circuit stability during normal PWM operation.
Solution Approach 2:
The energy storage element is continuously charged during the constant-level signal phase, ensuring uninterrupted energy availability. This continuous charging action eliminates delays and ensures the laser unit can illuminate immediately when required.
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 approach significantly improves the start-up speed of laser units, thereby enhancing the display effect of the laser projection apparatus.
Implementation Method 1
the energy storage element is charged and discharged
Implementation Method 2
the brightness of the corresponding laser unit is adjusted by adjusting the duty cycle of the PWM signal
Data Source
AI summary
A laser projection apparatus comprising a laser unit (40), a light modulation device (50), a projection lens (60), a display control circuit (20), and a laser unit control circuit (30). The laser unit control circuit (30) comprises a controller (31) and a driving circuit (32), the controller (31) being used for generating control signals on the basis of the light source driving signal, and the driving circuit (32) being used for generating, on the basis of the control signals, a power supply signal for supplying power to the corresponding laser unit (40). The control signals comprise a first control signal and a second control signal, the first control signal being a constant-level signal and the second control signal being a PWM signal.