Title:
DISPLAY DEVICE HAVING AN ELECTRON GUN WITH A PRE-FOCUSING LENS PORTION
Document Type and Number:
WIPO Patent Application WO2004057640
Kind Code:
A3
Abstract:
This invention relates to a display device comprising a cathode ray tube (1), the cathode ray tube having an electron gun (7) comprising a pre-focusing lens portion, for generating a pre-focusing lens field (22), and a main lens portion, for generating a main lens field (23). The electron gun (7) further comprises an additional grid (10), being positioned in proximity with said main lens portion, whereby a potential Vgx is arranged to be applied to said additional grid (10), for generating, together with one of the potentials Vfoc or Vdyn, an additional lens field in proximity with said main lens field, whereby, in operation, the main lens field and the additional lens field is arranged to cooperate to form an effective main lens field.
More Like This:
Inventors:
STEINHAUSER HEIDRUN (NL)
Application Number:
PCT/EP2003/014476
Publication Date:
November 11, 2004
Filing Date:
December 12, 2003
Export Citation:
Assignee:
LG PHILIPS DISPLAYS (NL)
STEINHAUSER HEIDRUN (NL)
STEINHAUSER HEIDRUN (NL)
International Classes:
H01J29/50; H01J29/51; H01J29/62; (IPC1-7): H01J29/50
Foreign References:
| EP1361597A2 | 2003-11-12 | |||
| EP1211710A2 | 2002-06-05 | |||
| US20020130608A1 | 2002-09-19 | |||
| EP1014417A1 | 2000-06-28 | |||
| EP0996140A1 | 2000-04-26 |
Download PDF:
Previous Patent: FLUORESCENT LAMP WITH ANTITHEFT DEVICE
Next Patent: RESISTOR FOR ELECTRON GUN STRUCTURE, ELECTRON GUN STRUCTURE AND CATHODE RAY TUBE
Next Patent: RESISTOR FOR ELECTRON GUN STRUCTURE, ELECTRON GUN STRUCTURE AND CATHODE RAY TUBE