Laser Diode Calibration via Model Comparison
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Solution Overview
Problem
Existing methods for calibrating laser diodes in laser projection devices are inefficient, as they often require access to extensive databases and do not account for variations in production tolerances and operating temperatures, leading to potential inaccuracies in optical output power and color reproduction.
Innovation Solution
A method for calibrating laser diodes by comparing acquired characteristic values with those of a model diode substantially identical in construction, using a database of characteristic values across various operating temperatures, and adjusting for shifts in electrical forward voltage, allowing for quick and accurate adaptation of optical output power levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods are used with extensive databases, then measurement precision may be maintained, but calibration time and device complexity increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-calibrating model laser diodes during manufacturing and storing their characteristic values in a database. This allows the calibration system to quickly retrieve and compare against pre-established reference data during operation, avoiding time-consuming real-time measurements while maintaining calibration accuracy.
Solution Approach 2:
The patent uses copying by creating a model laser diode that replicates the characteristics of the actual laser diode. The model diode's characteristic values are measured and stored, serving as a reference copy for calibration purposes. This eliminates the need for direct, time-consuming measurements of the actual diode during calibration.
2Measurement precision
If traditional calibration methods are used with extensive databases, then measurement precision may be maintained, but device complexity and calibration outlay increase
Solution Approach 1:
The system performs preliminary calibration of model laser diodes during manufacturing and stores their characteristic values in a database. This pre-processing step simplifies the operational calibration process by eliminating the need for complex real-time measurement systems, reducing both device complexity and calibration outlay while maintaining precision.
Solution Approach 2:
By using a model laser diode as a simplified copy for calibration purposes, the system reduces complexity. The model diode's characteristic values serve as reference data, eliminating the need for complex real-time measurement and comparison systems during operation.
3Ease of manufacture
If calibration does not account for production tolerances and operating temperatures, then calibration outlay is reduced, but manufacturing precision and reliability deteriorate
Solution Approach 1:
The patent applies local quality by measuring and storing characteristic values of the model laser diode at multiple specific operating temperatures. This creates temperature-specific calibration data that accounts for local variations in diode behavior under different thermal conditions, improving reliability without requiring excessive calibration resources.
Solution Approach 2:
The system accounts for production tolerances and temperature variations by measuring characteristic values across different operating conditions. The database stores multiple sets of characteristic values corresponding to different temperatures and potentially different production batches, allowing the system to select appropriate reference data that matches current operating parameters, thereby maintaining reliability.
Data Source
AI summary
A method for a calibration of at least one laser diode, in particular at least one laser diode of a laser projection device. The at least one laser diode is calibrated on the basis of a comparison of at least one currently acquired characteristic value of the at least one laser diode with at least one characteristic value, stored in at least one database, of a model laser diode that is at least substantially identical in construction to the at least one laser diode.