Laser Light Source Correction for Display Brightness
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Solution Overview
Problem
Current laser scanning displays face challenges in accurately correcting laser light amount in real time due to changes in laser characteristics caused by temperature changes or aging deterioration, leading to reduced image quality and resolution.
Innovation Solution
A light source device with a driving signal generating unit, a light amount measuring unit, and a light amount correcting unit that calculates and corrects light amount errors by integrating the product of light amount errors and gray-scale values, adjusting the differential efficiency and threshold values of the driving signal to maintain accurate light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time light amount correction is implemented, then light amount accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the light amount measuring unit, light amount correcting unit, and driving signal generating unit into an integrated system. The correcting unit merges multiple functions: measuring actual light amount, calculating light amount errors, correcting differential efficiency, and adjusting threshold values, all within a single integrated correction mechanism that operates simultaneously with the display device.
Solution Approach 2:
The patent implements a feedback control system where the light amount measuring unit continuously monitors the actual light output, compares it with target light amounts, and feeds back light amount errors to the correcting unit. This closed-loop feedback enables real-time automatic adjustment of driving signals to maintain accurate light emission despite laser characteristic changes.
2Measurement precision
If light amount correction is performed while operating, then correction accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent corrects two key parameters: differential efficiency (the variation of light amount with respect to driving signal variation) and threshold value (minimum driving signal required for light emission). By dynamically adjusting these parameters based on real-time measurements, the system adapts to laser characteristic changes without requiring complex computational models.
Solution Approach 2:
The patent performs preliminary correction by calculating integrated values of light amount errors before generating corrected driving signals. The correcting unit integrates light amount errors over time and uses these integrated values to pre-correct differential efficiency and threshold values, ensuring accurate light emission from the start of each correction cycle rather than requiring iterative adjustments.
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 real-time high-accuracy light amount correction, improving the display quality by minimizing light amount errors and maintaining consistent image brightness despite changes in laser characteristics.
Implementation Method 1
a light source; a driving signal generating unit that supplies a driving signal to the light source
Implementation Method 2
a light amount measuring unit that measures the amount of light of the light source
Data Source
AI summary
A light source device includes: a light source; a driving signal generating unit that supplies a driving signal to the light source; a light amount measuring unit that measures the amount of light of the light source; and a light amount correcting unit that calculates as a light amount error a difference between a target light amount corresponding to a gray-scale value indicated by gray-scale data input from the outside and the amount of light measured by the light amount measuring unit, corrects a differential efficiency by an integrated value of a product of the light amount error and the gray-scale value, corrects a threshold value of the driving signal, and outputs to the driving signal generating unit a command signal for generating a driving signal having a differential efficiency and a threshold value after the correction.