Amorphous silicon electrographic writing head assembly with prot

Details Amorphous silicon electrographic writing head assembly with prot Amorphous silicon electrographic writing head assembly with prot

1993-04-27

1994-08-09

Miller, Jr., George H.

Recorders

Electric recording

Electrochemical

G01D 1506

Patent

active

053370805

ABSTRACT:
An amorphous silicon electrographic writing head assembly which reduces the voltage drift in the high voltage driving transistor. The writing head including a substrate having a first surface and a second surface, the first surface having thin film elements fabricated thereon, the first surface having a first region, a second region, and a third region, the first region including an array of writing electrodes, the second region including an array of high voltage transistors, and the third region including interconnecting circuitry for connecting the thin film elements to a connector. The head also includes a first cover glass fixed to the first surface of the array covering the first region and a second cover glass fixed to the first surface of the array covering the third region. Also included are a first side glass fixed to the second surface of the array and a second side glass fixed to the first cover glass and the second cover glass whereby a channel is formed over the second region of the array where the high voltage driving transistor is located.

REFERENCES:
patent: 4399348 (1983-08-01), Bakewell
patent: 4466020 (1984-08-01), O'Connell
patent: 4588997 (1986-05-01), Tuan et al.
patent: 4766450 (1988-08-01), O'Connell
patent: 4984040 (1991-01-01), Yap
patent: 4998146 (1991-03-01), Hack
patent: 5148595 (1992-09-01), Doggett et al.

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