Doming
A temporary deformation of the pinhole or slit mask of a picture tube is referred to as doming , which occurs as a result of increased heating of the mask by the electron beam, e.g. B. by high brightness or contrast. As a result of the deformation, the perforated mask is no longer correctly aligned with the luminous layer , so that the electron beam no longer hits the correspondingly colored points of the luminous layer after passing through the perforated mask. This creates color impurities, especially in the corners and sides of the screen, as well as poor brightness distribution.
To avoid this effect, an Invar alloy can be used for the shadow mask. Stripe masks are also less susceptible because, due to their smaller surface, they only convert a smaller part of the energy contained in the electron beams into heat.
Individual evidence
- ↑ SR-Systeme.de: Doming ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. .
- ↑ Hardwaregrundlagen.de: Details on monitors ( Memento of the original from February 13, 2009 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. .
