Display Backlight Color Compensation for Laser Eyewear
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Solution Overview
Problem
Laser eye protection eyewear causes color skewing in display perceptions for crew members, increasing workload and response time, as it alters the perception of display colors, which is not effectively corrected by existing technologies.
Innovation Solution
An optical feedback and control system adjusts the intensity of multiple spectral light sources in a display backlight to match a desired color space, using a processor to calculate and compare chromaticity and luminance values, and a controller to adjust the radiant power of LEDs in response to the differences, ensuring consistent color uniformity regardless of laser eye protection eyewear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If laser eye protection eyewear is worn to protect crew members from laser damage, then eye protection is provided, but color perception of display is skewed and workload increases
Solution Approach 1:
The system changes the luminance parameters of different backlight LEDs (red, green, blue, yellow) to compensate for the color skewing effect of laser eye protection eyewear. By adjusting the intensity of each wavelength component, the display maintains accurate color perception when viewed through protective eyewear.
Solution Approach 2:
The system uses a color sensor to detect the actual color output of the display and feeds this information back to the controller. The controller then adjusts the backlight LED luminance values based on the sensor feedback to achieve the desired color appearance, creating a closed-loop control system that compensates for eyewear effects.
2Manufacturing precision
If grayscale definitions are changed at display driver level to correct color skewing, then color accuracy is improved, but the correction is limited and does not account for different eyewear types
Solution Approach 1:
The system dynamically adjusts the backlight luminance values based on real-time sensor measurements and the specific eyewear being worn. Rather than using fixed grayscale definitions, the system continuously adapts the color output to compensate for different eyewear types, making the correction both precise and versatile.
Solution Approach 2:
The system applies different luminance adjustments to different wavelength components (red, green, blue, yellow LEDs) based on the specific transmission characteristics of the laser eye protection eyewear. Each color channel is independently optimized to achieve accurate overall color perception through the protective eyewear.
3Adaptability or versatility
If multiple LEDs of different colors are used in backlight to enable color correction, then color control capability is improved, but device complexity increases
Solution Approach 1:
The backlight is segmented into multiple independent LED types (red, green, blue, yellow) that can be individually controlled. This segmentation allows precise color correction by adjusting each wavelength component separately, while the modular nature of LED arrays makes the implementation manageable despite the increased complexity.
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 system provides real-time chromaticity and luminance control, improving display readability and reducing the impact of laser eye protection on color perception, without the need for expensive sensing systems, and can adapt to different conditions such as night vision or nuclear flash blindness modes.
Implementation Method 1
Light-emitting diode (LED) arrays have shown great potential as a light source in liquid-crystal display (LCD) backlighting systems
Data Source
AI summary
A display having a variably controlled backlight and/or driver is disclosed. The backlight includes a first light source that emits light within a first spectral power distribution and has a first radiant power output. A second light source emits light within a second spectral power distribution matched to an optical filter for producing a perceived chromaticity and luminosity matching the perceived display appearance without the optical filter.