Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1997-02-10
1998-08-25
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313495, 313105CM, 3151691, H01J 3100
Patent
active
057986053
ABSTRACT:
The thin-type display device (1) with a vacuum envelope has a transparent front wall (3), which is provided with a display screen, and at least an electron source (5) and a duct structure, which cooperates with the electron source (5) and which extends substantially parallel to the front wall (3). Ducts (6, 6', 6") of the duct structure serve as electron-propagation means and are provided with walls (11, 11', 11") of an electrically insulating material having a secondary emission coefficient which is suitable for electron propagation. In the display device (1) 1.ltoreq.s/w.ltoreq.5 and s.multidot.w.gtoreq.5 mm.sup.2, where s is the depth of the ducts (6, 6', 6") and w is the width of the ducts (6, 6', 6"). Preferably, the width w.gtoreq.1.5 mm and the depth 3.5.ltoreq.s.ltoreq.15 mm. The voltage difference over the length of the ducts (6, 6', 6"), measured parallel to the front wall (3), is less than 75 V/cm, preferably less than 40 V/cm.
REFERENCES:
patent: 5313136 (1994-05-01), Van Gorkom et al.
patent: 5347199 (1994-09-01), Van Gorkom et al.
patent: 5497046 (1996-03-01), Van Gorkom et al.
Baller Theunis S.
De Zwart Siebe T.
Lambert Nicolaas
Montie Edwin A.
Trompenaars Petrus H. F.
Day Michael
Kraus Robert J.
O'Shea Sandra L.
U.S. Philips Corporation
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