Improvement of mislanding in shadow mask cathode ray tubes (CRTs) by electron-reflecting coatings

Mislanding caused by thermal deformation of the shadow mask during CRT operation was effectively improved by an electron-reflecting coating formed on the shadow mask surface. Coatings with high atomic number materials such as Bi 2 O 3 , WO 3 , and W exhibit high electron reflectance and reduce the amount of mislanding by about 40% compared to a conventional mask, when the CRT screen was brought to the highest brightness condition. These improvements in mislanding were mainly due to the energy dissipated by the electrons reflected by the coating. The effects of coating characteristics on mislanding were made clear, and the mechanism of the improvement was discussed.