Laser Display White Balance Control via Temperature Feedback
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Solution Overview
Problem
Laser display systems face challenges in maintaining proper white balance due to the temperature-dependent variation in laser diode output intensity, leading to poor picture quality.
Innovation Solution
A method and device that sense temperature, determine an allowable current range, adjust laser beam output intensity by comparing measured values to reference values, and account for wavelength variations to automatically adjust white balance in laser display systems with red, green, and blue laser sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser beam output intensity is adjusted by applying current to laser diode, then laser display system can operate, but laser beam output intensity varies with temperature causing white balance deterioration
Solution Approach 1:
The patent implements a feedback control system where a temperature sensor detects the current temperature of the laser diode, and this temperature information is fed back to a control unit. The control unit then adjusts the drive current accordingly to compensate for temperature-induced intensity variations, thereby maintaining stable white balance during operation.
Solution Approach 2:
The patent changes the operational parameters by adjusting the drive current based on temperature conditions. Different current values are applied depending on the detected temperature, allowing the system to adapt the laser output intensity to maintain consistent white balance across varying thermal environments.
2Reliability
If temperature compensation is implemented to maintain white balance, then picture quality is improved, but system complexity increases
Solution Approach 1:
The patent introduces a temperature sensor as an intermediary component that bridges the physical temperature condition and the control system. This sensor provides temperature data to the control unit, enabling automatic compensation without requiring complex manual intervention or sophisticated control algorithms.
Solution Approach 2:
The system performs self-service by automatically detecting temperature changes and adjusting the drive current without external intervention. The control unit autonomously processes temperature information and modifies operating parameters to maintain white balance, reducing the need for additional complex control mechanisms.
3Illumination intensity
If drive current is increased to compensate for intensity loss at higher temperatures, then output intensity is maintained, but power consumption increases
Solution Approach 1:
The patent optimizes parameter changes by adjusting the drive current only to the extent necessary to compensate for temperature-induced intensity variations. Rather than applying excessive current, the system calculates and applies the minimum required current adjustment to maintain target intensity levels, thereby minimizing additional power consumption.
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 ensures automatic white balance adjustment, providing optimal picture quality by minimizing power consumption and fine-tuning intensity variations with temperature and wavelength changes.
Implementation Method 1
a temperature sensing unit for sensing the present temperature of the laser beam source
Implementation Method 2
having red, green, and blue laser beam sources
Implementation Method 3
The laser diode used as the laser beam source can adjust laser beam output intensity with a current applied thereto
Data Source
AI summary
The present invention relates to device and method for adjusting white balance in a laser display system, which enables to adjust white balance taking an optical characteristic of a laser beam into account. The device for adjusting white balance in a laser display system, having red, green, and blue laser beam sources, includes a temperature sensing unit for sensing the present temperatures of the laser beam sources, a detecting unit for measuring laser beam output intensity of the laser beam sources, a storing unit for storing reference values on allowable current ranges at different temperatures and laser beam output intensity at different temperatures, an adjusting value generating unit for comparing a measured value of the laser beam output intensity obtained from the detecting unit to the reference values obtained from the storing unit, to generate an adjusting value, a laser beam source driving unit for adjusting the laser beam output intensity of a relevant laser beam source according to a current value within the allowable current range or the adjusting value generated thus, and a control unit for searching the storing unit for the allowable current range corresponding to the present temperature sensed thus, or the reference value corresponding to the laser beam output intensity measured thus to control the adjusting value generating unit and the laser beam source driving unit.