The image on a CRT is produced by electron beams as they are scanned over the inner surface of the CRT's faceplate. Magnetic fields in the CRT assembly guide the electron beams as they scan the faceplate, and the intensity of light and color emitted from the faceplate is controlled by video signals applied to the CRT electron gun. Often, other magnetic fields are present that, like those generated in the CRT assembly, affect the path of the electron beams. In the vast majority of cases, these fields have no perceivable effect on the image. On some occasions, alternating fields, such as those produced by AC operated equipment or wiring will cause the beams in the CRT to bend in time with the AC power. NEC Technologies shields its displays from internal and external magnetic fields. If none of the above procedures are adequate then it may be necessary to use an alternative display such as a flat panel display, since they are relatively immune to magnetic fields.
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