Laser Light Source Controller for Image Display Device
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Solution Overview
Problem
Image display devices using laser light sources face issues with reduced luminance and color gradation accuracy at high temperatures, particularly when displaying single colors or low-luminance images, due to fluctuations in light-emitting properties near the oscillation threshold.
Innovation Solution
The image display device incorporates a controller, temperature acquisition unit, and image forming unit to vary the light output ratio between red, green, and blue laser beams based on temperature information, ensuring optimal luminance and color representation by adjusting the light output ratio specifically for red and blue colors when displayed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a laser light source is used in an image display device, then the optical system can be downsized and a larger virtual image can be displayed, but the output of the light source relative to its input power decreases at certain temperatures causing luminance reduction
Solution Approach 1:
The patent adjusts the drive current supplied to the laser light source based on detected temperature variations. When temperature increases causing reduced optical conversion efficiency, the system increases the drive current to compensate and maintain stable luminance output. This dynamic parameter adjustment resolves the contradiction between compact optical system design and temperature-stable luminance performance.
2Loss of information
If the image display device displays a white image, then the driver can view comprehensive information, but the white image might be darkened at certain temperatures due to reduced light output
Solution Approach 1:
The system incorporates a temperature detection unit that continuously monitors the laser light source temperature and feeds this information to the control unit. The control unit then adjusts the drive current accordingly to maintain stable white image luminance. This feedback mechanism ensures that comprehensive information display is not compromised by temperature-induced darkening.
3Measurement precision
If the image display device displays a single-colored image, then the color information is clearly presented, but the image might be darkened at certain temperatures due to laser output fluctuation
Solution Approach 1:
The control unit dynamically adjusts the drive current to the laser light source based on temperature检测结果, specifically compensating for the reduced optical conversion efficiency at elevated temperatures. This maintains stable luminance output for single-color displays while preserving color accuracy, resolving the contradiction between clear color presentation and temperature-stable brightness.
4Use of energy by moving object
If the laser light source operates near its oscillation threshold, then energy consumption is reduced, but the light-emitting property fluctuates causing poor color gradation at low luminance
Solution Approach 1:
The temperature detection and control system monitors operating conditions and adjusts drive current to maintain optimal laser performance. When operating near the oscillation threshold, the system detects temperature variations and makes precise current adjustments to stabilize light emission and color gradation, ensuring acceptable display quality while maintaining energy efficiency.
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 effectively suppresses luminance reduction in single-color displays and finely adjusts luminance and gradations at low luminance, maintaining color visibility and accuracy even at high temperatures.
Implementation Method 1
a laser light source that emits a plurality of laser beams including a red laser beam, a green laser beam, and a blue laser beam
Implementation Method 2
the output of the light source relative to its input power (electric-optic conversion efficiency) may decrease at certain temperatures
Data Source
AI summary
An image display device includes a laser light source, a controller, a temperature acquisition unit, and an image forming unit. The laser light source emits a plurality of laser beams including a red laser beam, a green laser beam, and a blue laser beam. The controller controls lighting of the laser light source. The temperature acquisition unit obtains temperature information with respect to the laser light source. The image forming unit creates an image from the plurality of laser beams emitted from the laser light source. The controller varies a light output ratio between the plurality of laser beams, based on the temperature information obtained by the temperature acquisition unit.