100 and counting…

100 and counting…Steve Bush CRT technology, although over 100 years old, continues to be improved. To improve viewability, one of the more recent innovations has been the introduction of flat faceplates. Simply, these are made by bonding a flat sheet of glass to the front of the CRT gun and anode assembly instead of the domed plate normally used. This introduces a structural weakness as flat sheets do not resist atmospheric pressure as well as domes and the flat faceplates have to be thicker to compensate. Refraction effects in the faceplate can be accentuated by the extra thickness and, according to Samsung, the display can appear to be concave when viewed flat from CRTs at desktop distances. To counter this effect, Samsung has introduced Dynaflat, a flat front CRT range that has the inner face of the front sheet shaped to compensate for the optical effects that make the display appear concave. Along with this, the company has moved to a slot-type press welded formed mask, claimed to be the worlds first. This is needed to follow the curvature of the front sheet inner surface and is said to have a similar performance to stripe masks, like those in Sony Trinitron tubes, which use tension to maintain their shape. The 43cm (17 inch) tube enters production this month and the 48cm (19 inch) version should start up in October.

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