Narcissus is caused by the reflection of the cold stop off a lens surface back to the image plane of a cooled infrared system
and can be very difficult to remove from a lens design perspective. New infrared GRIN materials show the ability to
reduce the amount of narcissus in an optical system without the reduction in performance or addition of optical elements.
We report on the development of a highly scalable head-tracking system capable of tracking many users.
Throughout the operating area, a series of high-speed (4 kHz) near-infrared LED-based Digital Light Processor (DLP) picoprojectors provide overlapping illumination of the volume. Each projector outputs a sequence of binary images which encode the position of each pixel within the projected image as well as an identifier sequence for the
projector. Overlapping projectors use differing temporal multiplexing to allow sensor discrimination and background rejection. Pixel positions from multiple projectors received by each sensor are triangulated to obtain
position and orientation.
Dual band infrared focal plane arrays (FPA) are designed to act as two independent focal planes located at a common image plane which detects both the mid-wave infrared and the long-wave infrared images. The imagery produced is simultaneous and separable for the two bands. Systems utilizing these focal planes have often been designed to operate the same way as single band infrared sensors, except that two images of the same scene but different spectral bands are simultaneously captured, and displayed independently or as a fused image. An alternative method of exploiting dual band FPA is to utilize the dual band nature of the focal plane to simultaneously view different scenes. It is feasible to provide a picture-in-picture capability where one spectral band views a narrow field of view (FOV) to identify targets while the other spectral band images the wide FOV to provide situational awareness. We explore this capability, including design concepts and issues associated with the development of a dual band picture-in-picture infrared system.
KEYWORDS: Accelerated life testing, Organic light emitting diodes, Spectroscopy, Temperature metrology, Systems modeling, Video, Prototyping, Calibration, Visual process modeling, Data analysis
The US Army and eMagin Corporation established a Cooperative Research and Development Agreement (CRADA) to
characterize the ongoing improvements in the lifetime of OLED displays. This CRADA also called for the evaluation of
OLED performance as the need arises, especially when new products are developed or when a previously untested
parameter needs to be understood. In 2006, eMagin Corporation developed long-life OLED-XL devices for use in their
AMOLED microdisplays for head-worn applications. Through research and development programs from 2007 to 2010
with the US Government, eMagin made additional improvements in OLED life and developed the first SXGA (1280 X
1024 triad pixels) OLED microdisplay. US Army RDECOM CERDEC NVESD conducted life and performance tests
on these displays, publishing results at the 2007, 2008, 2009, and 2010 SPIE Defense and Security Symposia1,2,3,4. Life
and performance tests have continued through 2010, and this data will be presented along with a recap of previous data.
This should result in a better understanding of the applicability of AMOLEDs in military and commercial head mounted
systems: where good fits are made, and where further development might be desirable.
Spatial noise in imaging systems has been characterized and its impact on image quality metrics has been addressed
primarily with respect to the introduction of this noise at the sensor component. However, sensor fixed pattern noise is
not the only source of fixed pattern noise in an imaging system. Display fixed pattern noise cannot be easily mitigated
in processing and, therefore, must be addressed. In this paper, a thorough examination of the amount and the effect of
display fixed pattern noise is presented. The specific manifestation of display fixed pattern noise is dependent upon the
display technology. Utilizing a calibrated camera, US Army RDECOM CERDEC NVESD has developed a microdisplay
(μdisplay) spatial noise data collection capability. Noise and signal power spectra were used to characterize the
display signal to noise ratio (SNR) as a function of spatial frequency analogous to the minimum resolvable temperature
difference (MRTD) of a thermal sensor. The goal of this study is to establish a measurement technique to characterize
μdisplay limiting performance to assist in proper imaging system specification.
The US Army and eMagin Corporation established a Cooperative Research and Development Agreement (CRADA) to
characterize the ongoing improvements in the lifetime of OLED displays. This CRADA also called for the evaluation of
OLED performance as the need arises, especially when new products are developed or when a previously untested
parameter needs to be understood. In 2006, eMagin Corporation developed long-life OLED-XLTM devices for use in
their AMOLED microdisplays for head-worn applications. Through Research and Development programs from 2007 to
2009 with the US Government, eMagin made additional improvements in OLED life and developed the first SXGA
(1280 × 1024 triad pixels) OLED microdisplay. US Army RDECOM CERDEC NVESD conducted life and
performance tests on these displays, publishing results at the 2007, 2008, and 2009 SPIE Defense and Security
Symposia1,2,3. Life and performance tests have continued through 2009, and this data will be presented along with a
recap of previous data. This should result in a better understanding of the applicability of AMOLEDs in military and
commercial head mounted systems: where good fits are made, and where further development might be desirable.
KEYWORDS: Organic light emitting diodes, Accelerated life testing, Prototyping, Video, Time metrology, Contrast transfer function, Photometry, Military display technology, Chromium, Temperature metrology
The US Army and eMagin Corporation established a Cooperative Research and Development Agreement (CRADA) to
characterize the ongoing improvements in the lifetime of OLED displays. This CRADA also called for the evaluation of
OLED performance as the need arises, especially when new products are developed or when a previously untested
parameter needs to be understood. In 2006, eMagin Corporation developed long-life OLED-XL devices for use in their
AMOLED microdisplays for head-worn applications. RDECOM CERDEC NVESD conducted life tests on these
displays, finding over 200% lifetime improvement for the OLED-XL devices over the standard OLED displays,
publishing results at the 2007 and 2008 SPIE Defense and Security Symposia1,2. In 2008, eMagin Corporation made
additional improvements on the lifetime of their displays and developed the first SXGA (1280 × 1024 triad pixels)
OLED microdisplay. A summary of the life and performance tests run at CERDEC NVESD will be presented along
with a recap of previous data. This should result in a better understanding of the applicability of AMOLEDs in military
and commercial head mounted systems: where good fits are made, and where further development might be desirable.
OLED displays have been known to exhibit high levels of performance with regards to contrast, response time,
uniformity, and viewing angle, but a lifetime improvement has been perceived to be essential for broadening the
applications of OLED's in the military and in the commercial market. As a result of this need, the US Army and eMagin
Corporation established a Cooperative Research and Development Agreement (CRADA) to improve the lifetime of
OLED displays. In 2006, eMagin Corporation developed long-life
OLED-XL devices for use in their AMOLED
microdisplays for head-worn applications, and RDECOM CERDEC NVESD ran life tests on these displays, finding over
200% lifetime improvement for the XL devices over the standard displays. Early results were published at the 2007
SPIE Defense and Security Symposium. Further life testing of XL and standard devices at ambient conditions and at
high temperatures will be presented this year along with a recap of previous data. This should result in a better
understanding of the applicability of AMOLEDs in military and commercial head mounted systems: where good fits are
made, and where further development might be needed. This is a continuation of the paper "Life test results of OLED-XL
long-life devices for use in active matrix organic light emitting diode (AMOLED) displays for head mounted
applications" presented at SPIE DSS in 2007.
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