Laser Control Unit Initial Current Optimization
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Solution Overview
Problem
In display apparatus using laser elements, the optical output converges slowly to the target value due to temperature-dependent current and light emission efficiency changes, leading to a large difference between initial and optimum current values, resulting in prolonged convergence times.
Innovation Solution
A control apparatus with a temperature sensor and laser driver that determines an initial driving current value based on temperature characteristic data, allowing the optical output to converge to a target value by starting from an optimized initial current value, reducing the time required for convergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed initial driving current value is used to start the laser element, then the control system is simple, but the optical output converges slowly to the target value when temperature changes occur
Solution Approach 1:
The system performs preliminary temperature measurement and calculates the appropriate initial driving current value before actually starting the laser element. This preliminary action ensures that the laser element starts from an optimized current value that accounts for temperature effects, thereby reducing convergence time without adding complex control mechanisms during operation.
Solution Approach 2:
The initial driving current value is changed based on temperature characteristics. Instead of using a fixed current value, the system adjusts the initial current parameter according to the measured temperature and stored temperature characteristic data, allowing the laser element to start closer to its optimal operating point and reducing the time required to converge to the target optical output value.
2Measurement precision
If the initial driving current value is set to match the optimum current value for a specific temperature, then the optical output is accurate at that temperature, but the difference from optimum current value increases at other temperatures
Solution Approach 1:
The system pre-stores temperature characteristic data that maps temperatures to optimal initial driving current values. Before operating the laser element, the system measures the temperature and retrieves the corresponding optimal current value from storage, enabling accurate optical output across different temperatures without real-time complex calculations.
Solution Approach 2:
The system changes the initial driving current parameter based on temperature conditions. By storing multiple temperature characteristic data sets and selecting the appropriate one based on measured temperature, the system maintains optical output accuracy across varying temperatures, effectively adapting to different thermal environments.
3Adaptability or versatility
If a large difference exists between initial and optimum current values, then the laser element can start at various temperatures, but the optical output value takes longer to converge to target
Solution Approach 1:
The system performs preliminary temperature measurement and calculates the temperature-specific initial driving current value before starting the laser element. This ensures that even though the laser can operate across various temperatures, it always starts from an optimized current value that minimizes convergence time for the current temperature condition.
Solution Approach 2:
The initial driving current parameter is dynamically changed based on temperature conditions. By adjusting the initial current parameter to match temperature-specific requirements, the system enables operation across a wide temperature range while minimizing convergence time at each temperature, resolving the trade-off between adaptability and convergence speed.
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 quickly stabilizes the optical output of the laser element, ensuring rapid convergence to the target optical output value, even under temperature variations, thereby improving the efficiency and speed of image display.
Implementation Method 1
a temperature sensor configured to detect a temperature of the laser element
Implementation Method 2
a laser element; a laser driver configured to drive the laser element
Data Source
AI summary
A control apparatus is used in a display apparatus. The control apparatus includes a laser element; a temperature sensor configured to detect a temperature of the laser element; a laser driver configured to drive the laser element; and a laser control unit configured to control a driving current to be supplied to the laser element by the laser driver, such that an optical output value of the laser element converges to a target optical output value. The laser control unit determines an initial driving current value that causes an initial optical output value to be output from the laser element, based on temperature characteristic data of the initial driving current value, and a detection temperature of the laser element detected by the temperature sensor, and controls the driving current to start from the determined initial driving current value.