Display tube

Details Display tube Display tube

H - Electricity

01

J

313/1

H01J 31/12 (2006.01) H01J 29/46 (2006.01)

Patent

CA 1194071

13 ABSTRACT: A flat panel display tube having a large area screen, typically of 1 M2, is disclosed. In order to pre- vent the walls of the envelope from imploding supporting walls are provided to divide the interior of the envelope into a plurality of modules. Each module has its own elec- tron beam generating means for producing a low voltage, low current, intensity modulated electron beam which is directed vertically upwards. A laminated channel plate electron multiplier is disposed across the module and extends sub- stantially parallel to the front and rear walls of the envelope. In the embodiment illustrated, a single column of channels is provided in the electron multiplier, the spacing of which channels determines the vertical resolu- tion of the reproduced image. In order to deflect the electron beam into a particular channel, a plurality of deflector electrodes are disposed on the rear wall. These electrodes and the input dynode of the electron multiplier are generally held at the same potential to define a field- free space. However in order to deflect the electron beam, the potential applied t electrodes ahead of the deflection point is reduced so that the beam is deflected towards the selected channel in the electron multiplier. The current multiplied electron beam from the output of the electron multiplier undergoes focusing, horizontal deflection and post deflection acceleration as a result of suitable volt- ages applied to electrodes provided on the supporting walls. These electrodes may be parallel to each other or may diverge in a direction towards the front wall.

414848

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