Cathode ray tube apparatus
US5552663A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1994 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | Sep 22, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2229/8616
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention enlarges the effective display area of a CRT for projecting while maintaining the strength of the panel necessary to allow for normal usage without breaking. The inside portion of the effective display area inside the rectangular display area is of a predetermined radius, and protrudes inward, extending in all directions. The four corners of the display area are outside of the circular boundary line comprised of the standard thickness Tf. Non-display areas H which are outside the boundary line are flat or protuberant, and have a thickness greater than the standard thickness Tf. Accordingly, with the present invention, the effective display area A2 can be made larger than previous effective display areas A1 in the prior art, which could not extend beyond a border that included the four corners, while maintaining overall the necessary strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.