Micro-LED Display Assembly for NVIS-Compatible Day-Night Color Output
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Solution Overview
Problem
Existing LCD and OLED display technologies in aircraft cockpits are not compatible with night-vision imaging systems (NVIS) due to emission of near-infrared and pronounced red wavelengths, and micro-LEDs lack sufficient light output for efficient operation in both day and night vision modes.
Innovation Solution
A display device using a compact assembly of micro-LEDs with a red diode and an additional diode with a shifted wavelength, controlled to emit orange light for NVIS compatibility, along with other diodes for standard vision, allowing a seamless transition between modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LCD display screens use traditional backlighting with red LEDs or full-spectrum white LEDs, then color display quality for day vision is improved, but near-infrared and red light emission increases which interferes with night-vision equipment
Solution Approach 1:
The backlighting system is segmented into multiple independent LED chips with different emission spectra (blue, cyan, green, yellow-green, red). This allows selective activation of specific LED groups depending on operational mode (day vision or night vision), enabling color display during daytime while minimizing infrared/red emission during night vision operation.
Solution Approach 2:
The display device dynamically adjusts its emission characteristics by selectively activating different LED groups based on operational conditions. During day vision, all LED groups including red-emitting chips are activated for full color display. During night vision mode, the system dynamically switches to activate only blue, cyan, green, and yellow-green LED groups, excluding red-emitting chips, thereby adapting emission properties to operational requirements.
2Adaptability or versatility
If filters are added to block near-infrared and red wavelengths for night-vision compatibility, then night-vision equipment compatibility is improved, but color display quality and brightness for day vision deteriorates
Solution Approach 1:
Instead of using filters that would degrade overall light output, the solution segments the light source into multiple spectral components using separate LED chips. This allows the system to provide full color display during daytime by activating all LED groups, while achieving night-vision compatibility during nighttime by selectively activating only the non-red LED groups, thus avoiding the need for light-blocking filters.
Solution Approach 2:
The system changes its spectral emission parameters dynamically based on operational mode. During day vision, the emission spectrum includes all visible wavelengths for full color display. During night vision mode, the emission spectrum is modified by excluding red wavelengths (above 640nm), thereby adapting the optical parameters to match the requirements of night-vision equipment without requiring physical filters.
3Adaptability or versatility
If a two-stage display system with separate day and night LED arrays is used, then night-vision compatibility is improved, but device complexity and structural requirements increase
Solution Approach 1:
The solution merges multiple LED chip types with different emission spectra into a single integrated backlighting assembly. All LED chips (blue, cyan, green, yellow-green, and red) are mounted together on the same substrate and controlled by a single controller, eliminating the need for separate physical display panels or complex mechanical switching mechanisms. This unified structure reduces overall system complexity while maintaining night-vision compatibility through electronic control.
Solution Approach 2:
The single backlighting assembly serves multiple functions: it provides full-color display during daytime operation and automatically adapts to provide night-vision compatible display during nighttime operation. The controller universally manages all LED groups, enabling the same physical structure to fulfill both day vision and night vision requirements without requiring separate specialized components for each mode.
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
Enables efficient operation in both day and night vision modes by minimizing red and infrared emissions, ensuring compatibility with NVIS equipment and maintaining high luminance and contrast.
Implementation Method 1
each elementary component being made up of a compact assembly of light-emitting diodes of different colours
Implementation Method 2
one group of light-emitting diodes of the compact assembly comprising a so-called red diode which is the closest in the group, by its emission spectrum, to the red end of the visible light spectrum
Data Source
AI summary
A display device including elementary components for composing an image. Each component is made up of a compact assembly of light-emitting diodes, one group of diodes comprising a red diode and one or more other diodes which together have an emission spectrum comprising, during nominal operation, less red than that of the red diode, the group carrying out with the other elementary components a colour display for an operator to the naked eye. The assembly further comprises an additional diode which has, during nominal operation, with respect to the red diode, a wavelength that is less close to red, and with respect to the common spectrum a supplementary emission spectrum, for a colour display compatible with the use by an operator and in the vicinity of the display device of a night-vision tool sensitive to the near-infrared.