Laser Scanning Display White Balance Stabilization
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Solution Overview
Problem
In laser scanning display devices, updating light intensity characteristics for each color laser light source leads to delayed white balance adjustment, resulting in unstable display color and brightness, especially under varying environmental conditions.
Innovation Solution
A laser scanning display device incorporating a dimmer means, first and second light detection means, and storage means to calculate and adjust light intensity characteristics and white balance for each color, ensuring stable display color and brightness by correcting current control data based on detected light intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light intensity characteristic is updated for each color laser light source, then light intensity accuracy is improved, but white balance adjustment speed deteriorates
Solution Approach 1:
The patent segments the light detection function into two distinct detection units: a first light detection unit that detects light intensity before the dimmer to calculate light intensity characteristics, and a second light detection unit that detects light intensity after the dimmer to adjust white balance. This segmentation allows simultaneous independent operation of both functions, resolving the contradiction between accurate light intensity measurement and fast white balance adjustment.
2Illumination intensity
If polarization control element is used to control laser light, then brightness control is improved, but white balance adjustment difficulty increases
Solution Approach 1:
The patent introduces a second light detection unit as an intermediary between the polarization control element (dimmer) and the white balance adjustment process. This intermediary detects the actual light intensity after dimming and provides feedback to the control unit, which then adjusts the drive current to compensate for wavelength-dependent dimming effects. This intermediary measurement enables automatic white balance maintenance despite the complexity introduced by the polarization control element.
3Manufacturing precision
If light intensity characteristic calculation is performed for each color, then display color accuracy is improved, but adjustment response time deteriorates
Solution Approach 1:
The patent implements continuous parallel operation of two detection functions: the first light detection unit continuously monitors light intensity before the dimmer to maintain accurate light intensity characteristics, while the second light detection unit continuously monitors light intensity after the dimmer to maintain white balance. Both detections occur simultaneously and continuously rather than sequentially, ensuring rapid response to environmental changes while maintaining color accuracy.
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
The device quickly provides stable display color and brightness even when light intensity characteristics change, effectively addressing the issue of delayed white balance adjustment and environmental influences.
Implementation Method 1
a plurality of light sources of different emission colors that emits a laser light with a light intensity corresponding to a current supplied
Implementation Method 2
a dimmer means that modulates the light intensity of the laser light emitted from the light source
Implementation Method 3
a first light detection means that detects the light intensity of the laser light before entering the dimmer means, and a second light detection means that detects the light intensity of the laser light after entering the dimmer means
Data Source
AI summary
A dimmer unit is equipped with a first light detection unit that modulates the light intensity of composite laser light emitted from a composite laser light emission unit and detects the light intensity of the composite laser light before entering the dimmer unit, and a second light detection unit that detects the light intensity of the composite laser light after entering the dimmer unit. The light intensity characteristic for each color in the composite laser light emission unit is calculated on the basis of the light intensity detected by the first light detection unit, and the white balance of each color in the composite laser light emission unit is adjusted on the basis of the light intensity detected by the second light detection unit.