Method of manufacturing a luminescent screen assembly for a cathode-ray tube
US6013400A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1998 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Feb 9, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/2278
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method of manufacturing a luminescent screen structure 22 with a light-absorbing matrix 23, having a plurality of substantially equally sized openings therein, on an inner surface of a CRT faceplate panel 12. A color selection electrode 24 is spaced a distance, Q, from the inner surface. The method includes providing a first photoresist layer 50, whose solubility is altered when it is exposed to light, on the inner surface of the faceplate panel 12. The first photoresist layer 50 is exposed to light from two symmetrically located source positions +G and -G, relative to a central source position, 0. Then the more soluble regions 54 of the photoresist layer 50 are removed, overcoated with a light-absorbing material 58 and developed to remove the retained, less soluble regions 52 of the first photoresist layer with the light-absorbing material thereon. First guardbands 60 of light-absorbing material remain on the interior surface of the faceplate panel 12. The process is repeated twice more, using second and third photoresist layers 70 and 90 and two asymmetrically located light source positions +B, -B and +R, -R, respectively to produce second and third gua…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.