Display devices

Details Display devices Display devices

1997-04-29

1999-03-30

Patel, Nimeshkumar

Electric lamp and discharge devices

With luminescent solid or liquid material

Vacuum-type tube

313496, 313497, 313422, H01J 2900

Patent

active

058893636

ABSTRACT:
A display device having a screen is provided in which a back-plate is sealed to the screen to form an evacuated chamber. An area cathode is disposed between the back-plate and the screen. A permanent magnet is disposed between the cathode and the screen. A two dimensional array of rows and columns of channels extends between opposite poles of the magnet for receiving electrons from the cathode. An anode phosphor layer is disposed between the screen and the magnet for receiving electrons from the channels. A grid electrode between the area cathode and the magnet controls flow of electrons from the cathode into the channels, whereas an anode between the magnet and the anode phosphor layer controls flow of electrons from the channels towards the screen. In a preferred embodiment, the cathode means comprises the backplate and a silica glass substrate peripherally sealed to the back-plate to produce a chamber in which a gas is contained. A layer of photo-sensitive material is disposed on the surface of the substrate external to the chamber. A cathode phosphor layer is disposed between the back-plate and the substrate. A pair of electrodes facing each other from opposite sides of the chamber energizes the gas to generate a plasma for exciting the phosphor to generate light energy to produce electron emissions from the photo-cathode.

REFERENCES:
patent: 3622829 (1971-11-01), Watanabe
patent: 4236096 (1980-11-01), Tiemann
patent: 4618801 (1986-10-01), Kakino
patent: 4900981 (1990-02-01), Yamazaki et al.
patent: 5003219 (1991-03-01), Muragishi et al.
patent: 5055934 (1991-10-01), Swank
Derwent Publications, Ltd. (1994) Excerpt from Database WPI, Section E1, Week 9411, vol. 5.

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