|Category:||Head-Mounted Equipment [HMD/NVG/Glasses]|
|Object Name:||Cathode Ray Tube|
|Year of Manufacture:||1982|
|Location:||Archive Object Store|
Thomas Electronics, Inc
100 Riverview Drive, Wayne, New Jersey 07470
A CRT can run in 2 modes:
Cursive- this is where lines are vector drawn on the screen. Only a small area of the screen is illuminated but very high luminance levels are achievable (~10,000fL)
Raster- this is where the whole screen is covered by scanning – as in conventional TV. Luminance is lower (~3,000fL)
The two can be mixed by doing the cursive writing during the flyback of the raster scan.
On the down side, high resolution CRTs are generally limited to one colour (usually green), are based on valve technology, involve high voltage (up to 13kV) and are heavy (a 1” CRT weighs about 80g)
A nominal 1” CRT can (just) achieve SXGA resolution, they are obsolescent resistant, and have a good temperature range. They are not a pixilated device so any distortion correction (to offset any optical distortion elsewhere) can be achieved without necessarily losing resolution.
:This CRT is a 20mm tube "01852" is the CAGE code for Thomas Electronics, Inc. who were used as an alternative to the Brimar tubes.