Night Vision Display Backlight With Low >650 Nm Emission
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Solution Overview
Problem
Conventional display systems interfere with night vision equipment by emitting light in the red and near-infrared spectrum, causing the night vision equipment to bloom and become unusable.
Innovation Solution
The use of an LED light source optically coupled or radiationally connected to a phosphor material, including a green-emitting phosphor and a red-emitting phosphor, which limits the emission of wavelengths longer than 650 nm to less than 1.75% of total emission, ensuring compatibility with night vision equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional display systems use standard backlighting with broad spectrum emission, then display brightness and visibility are improved, but night vision equipment becomes saturated and unusable
Solution Approach 1:
The patent applies parameter changes by modifying the emission spectrum of the display backlight to limit wavelengths longer than 650 nm to less than 1.75% of total emission. This spectral parameter modification allows the display to maintain brightness while preventing night vision equipment saturation, directly resolving the contradiction between display visibility and night vision compatibility
Solution Approach 2:
The patent uses composite phosphor materials including a green-emitting phosphor and a red-emitting phosphor with specific compositional characteristics (formula I with specific elements and charge ratios). These composite materials produce the required spectral distribution that enables both adequate display brightness and night vision compatibility simultaneously
2Illumination intensity
If display emission in the red end of the spectrum (650-900 nm) is increased for better visibility, then display performance is improved, but night vision equipment blooms and becomes unusable
Solution Approach 1:
The patent implements parameter changes by precisely controlling the red phosphor emission characteristics to limit wavelengths longer than 650 nm to less than 1.75% of total emission. This parameter control enables the display to provide adequate visibility while eliminating the harmful red spectrum emission that causes night vision blooming
Solution Approach 2:
The patent applies local quality by creating a display with non-uniform spectral distribution - strong emission in the blue-green region (450-550 nm) for visibility, and suppressed emission in the red region (>650 nm) to prevent night vision interference. This localized spectral quality differentiation resolves the contradiction between visibility and blooming prevention
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 solution effectively prevents the night vision equipment from blooming, allowing for simultaneous use of instrument displays and night vision gear without compromising the functionality of either.
Implementation Method 1
Light emitting diodes (LEDs) are another display technology that uses a pn-junction diode to emit light when activated through electroluminescence
Implementation Method 2
the photoluminescence materials generate a light signal in response to radiation excitation from a backlight
Data Source
AI summary
The present disclosure relates to a device used in conjunction with night vision equipment. The device including an LED light source optically coupled and/or radiationally connected to a phosphor material including a green-emitting phosphor and a red-emitting phosphor of formula I:AxMFy:Mn4+ Iwherein A is Li, Na, K, Rb, Cs, or a combination thereof; M is Si, Ge, Sn, Ti, Zr, Al, Ga, In, Sc, Hf, Y, La, Nb, Ta, Bi, Gd, or a combination thereof; x is an absolute value of a charge of the MFy ion; and y is 5, 6 or 7. The device limits emission of wavelengths longer than 650 nm to less than 1.75% of total emission. A device including an LED light source optically coupled and/or radiationally connected to a red-emitting phosphor including Na2SiF6:Mn4+ is also provided.