Title:
DISPLAY DEVICE AND CATHODE RAY TUBE
Document Type and Number:
WIPO Patent Application WO2002052604
Kind Code:
A3
Abstract:
A display device comprising a deflection unit and a cathode ray tube having an in-line electron gun. The electron gun comprises a main lens portion having means for generating a main lens field and an auxiliary field. Furthermore, the electron gun comprises a prefocusing lens portion having a first, a second and a third electrode for generating a prefocusing lens field. In operation, in a direction perpendicular to the in-line plane, the auxiliary field and the main lens cause the electron beam to leave the main lens substantially parallel to the in-line plane, whereby the diameter of the electron beam at a gap of the main lens at the anode side is smaller than or equal to the diameter of the aperture of the second electrode throughout the deflecton of the electron beam across the display screen. By virtue thereof, an improved picture reproduction can be obtained.
More Like This:
| JPS63168938 | ELECTRON GUN STRUCTURE FOR IN-LINE TYPE COLOR CATHODE-RAY TUBE |
| JP2005501378 | HE-CRT pre-focus lens |
Inventors:
STEINHAUSER HEIDRUN
GELTEN RONALD J
GELTEN RONALD J
Application Number:
PCT/IB2001/002454
Publication Date:
May 30, 2003
Filing Date:
December 07, 2001
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
International Classes:
H01J29/48; H01J29/50; (IPC1-7): H01J29/50
Foreign References:
| EP0509590A1 | 1992-10-21 | |||
| US5404071A | 1995-04-04 | |||
| US6002201A | 1999-12-14 | |||
| US5539278A | 1996-07-23 |
Download PDF: