• Patent Title: Carbon black coating for CRT display screen with uniform light absorption
  • Application No.: US09864063
    Application Date: 2001-05-23
  • Publication No.: US06623662B2
    Publication Date: 2003-09-23
  • Inventor: Kuo-Chu WangChun-Min Hu
  • Applicant: Kuo-Chu WangChun-Min Hu
  • Main IPC: B05D512
  • IPC: B05D512
Carbon black coating for CRT display screen with uniform light absorption
Abstract:
A two-layer coating for the outer surface of the display screen of a color cathode ray tube (CRT) includes an inner carbon black-based layer and an outer silica-based layer. The inner layer is antistatic, while the outer layer is antireflective. To compensate for the increased absorption of blue light by the carbon black particles, which results in a color video image having a yellowish tint, a blue additive, such as a pigment or dye, is added to the coating to adjust its light absorbance characteristics and provide uniform light absorbance over the entire visible spectrum of 400-700 nm for improved color video image presentation.
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