Dual-Controller Light Beam Generating Device for Accurate Luminance Regulation
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Solution Overview
Problem
Current projector technologies face challenges in accurately regulating light beam luminance due to the limited computing speed of micro controlling units (MCUs) and the sensitivity of laser diodes to current variations and temperature changes, leading to potential inaccuracies in display quality and risk of laser diode failure.
Innovation Solution
A light beam generating device with a multi-loop control system, featuring a first controller, driver, illuminating device, sensing device, and a second controller with higher computing speed, which generates adjustment signals to dynamically control the driving current and luminance of the light beam, using a sensing current signal and sensing luminance signal to improve luminance regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a micro controlling unit (MCU) is used to perform luminance regulation operations, then the cost is reduced, but the computing speed is limited resulting in inaccurate luminance regulation
Solution Approach 1:
The controller is divided into two separate units: a first controller (MCU) for cost-effective basic control functions and a second controller for high-speed computing operations. This segmentation allows each controller to specialize in specific tasks, with the second controller handling the computationally intensive luminance regulation calculations that require high speed, while the first controller manages other control functions. The division resolves the contradiction by achieving both cost efficiency and high-accuracy luminance regulation.
Solution Approach 2:
A dual-controller architecture acts as an intermediary between the cost constraints and the performance requirements. The first controller serves as a mediator for basic control operations, while the second controller mediates the high-speed computing needs for accurate luminance regulation. This intermediary structure allows the system to balance both cost and performance requirements effectively.
2Measurement precision
If the computing speed of the controller is increased to improve luminance regulation accuracy, then the display quality is improved, but the device complexity and cost increase
Solution Approach 1:
The control system is segmented into two specialized controllers: a first controller for basic control functions and a second controller for high-speed, high-precision luminance regulation calculations. This segmentation enables the system to achieve high measurement precision for luminance control without requiring the entire system to be complex, as only the second controller needs high computing capabilities.
Solution Approach 2:
The dual-controller architecture provides multi-functionality where the first controller handles basic control operations and the second controller handles high-speed computing tasks. This universal approach allows the system to perform multiple functions with specialized components, achieving high precision luminance regulation while managing overall system complexity through functional distribution.
3Illumination intensity
If the driving current of laser diodes is adjusted to control luminance, then the luminance regulation is achieved, but the risk of laser diode failure increases due to current variation sensitivity
Solution Approach 1:
The system implements a feedback mechanism where the second controller continuously monitors and adjusts the driving current to the laser diodes based on luminance regulation requirements. By using high-speed computing to precisely control current variations and implement real-time feedback, the system achieves accurate luminance regulation while minimizing excessive current fluctuations that could cause laser diode failure, thus maintaining reliability.
Solution Approach 2:
The system dynamically adjusts the driving current parameters to the laser diodes under the control of the second high-speed controller. By precisely controlling the magnitude and timing of current changes, the system achieves the necessary luminance regulation while keeping current variations within safe limits that prevent laser diode damage, balancing illumination intensity control with component reliability.
Data Source
AI summary
A projection system, a light beam generating device thereof and a method for controlling light beam luminance are provided. The light beam generating device includes a first controller, a driver, an illuminating device, a sensing device and a second controller. The driver generates a driving current according to a control command. The illuminating device generates an output light beam according to the driving current. The sensing device detects the driving current and the output light beam to respectively generate a sensing current signal and a sensing luminance signal. The second controller generates an adjustment signal according to the sensing current signal and the sensing luminance signal. The first controller or the second controller generates the control command according to the adjustment signal, and a computing speed of the second controller is greater than a computing speed of the first controller.