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Title:
DISPLAY TUBE AND DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO2003046942
Kind Code:
A3
Abstract:
A display tube comprises an electron source (10), a module (20) provided with a guidance cavity (25R, 25G, 25B) for guiding electrons emitted by the electron source (10) to an exit aperture (27R, 27G, 27B) of the guidance cavity (25R, 25G, 25B), and beam-shaping means (30) for forming an electron beam (EBR, EBG, EBB) from guided electrons leaving the exit aperture (27R, 27G, 27B). The electron beam (EBR, EBG, EBB) travels towards a display screen (3). The beam-shaping means (30) are arranged to constitute, in operation, an electron lens for shaping the electron beam (EBR, EBG, EBB) so as to compensate for unwanted distortions of the shape of the electron beam (EBR, EBG, EBB) between the exit aperture (27R, 27G, 27B) and the display screen (3). These distortions are, for example, caused by the magnetic field of deflection means (2). The image quality of the display tube is improved.

Inventors:
VAN DER VAART NIJS C (NL)
VAN DER POEL WILLIBRORDUS A J (NL)
Application Number:
PCT/IB2002/004800
Publication Date:
June 10, 2004
Filing Date:
November 15, 2002
Export Citation:
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Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
VAN DER VAART NIJS C (NL)
VAN DER POEL WILLIBRORDUS A J (NL)
International Classes:
H01J29/02; H01J29/48; (IPC1-7): H01J29/48; H01J3/02
Domestic Patent References:
WO2001026131A12001-04-12
WO2000079558A12000-12-28
WO2002027749A22002-04-04
WO2002041342A22002-05-23
WO2002097844A22002-12-05
WO2002097845A22002-12-05
WO2003019603A12003-03-06
WO2003041039A22003-05-15
Foreign References:
US4682074A1987-07-21
US4814670A1989-03-21
US20010015627A12001-08-23
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