Color image display device
US6798155B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 17, 2002 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Sep 17, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J29/52
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A color image display device has an auxiliary means for compensating brightness simply and inexpensively by using an electron gun of a cathode ray tube. Brightness uniformity is improved in the image display device having a flat-type color cathode ray tube with a glass panel having a high wedge ratio and a low transmissibility. The color image display includes a panel housing a screen on an inner face thereof, a funnel engaged with the panel; an electron gun engaged with a neck portion of the funnel for emitting electron beams toward the screen, a deflection device for displaying an image by deflecting the electron beams emitted from the electron gun in horizontal and vertical directions with respect to the screen, and a cathode ray tube including a shadow mask aligned from the screen at a predetermined distance. The color image display device has an electron gun which includes a triode section having a cathode for generating electron beams, a grid electrode aligned to be adjacent to the cathode and an accelerating electrode aligned to be adjacent to the grid electrode. A video signal voltage is applied to the cathode, and a variable voltage is applied to the grid electrode or acce…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.