Communications: electrical – Systems – Portable self-contained
Patent
1976-04-05
1978-10-31
Curtis, Marshall M.
Communications: electrical
Systems
Portable self-contained
340166EL, 315169R, G06F 314
Patent
active
041237510
ABSTRACT:
Drive circuits for a flat panel display using a matrix of DC responsive phosphor dots are disclosed. Enabled row conductors receive a pulse of DC potential equal to +HV, whereas disabled row conductors receive +HV/.sub.2. Enabled column conductors receive zero potential, whereas disabled column conductors receive +HV/.sub.2. HV is in the range 90 to 140V. This allows semiconductor integrated circuit display drivers to be used in conjunction with the column conductors. Discrete transistor complementary-pair drivers are used for the row conductors. Scanning and character generation functions are achieved by the use of semiconductor integrated circuits. A pulse-width brightness control operates by selection of one of several logical combinations of the outputs of a counter. Two or four column driver circuits are provided to simplify high density connection problems and a divider circuit causes the column driver circuits to be addressed in sequence. Physical connection to the column drivers is made alternately from the top and bottom of the matrix.
REFERENCES:
patent: 2932770 (1960-04-01), Livingston
patent: 3824580 (1974-07-01), Bringol
patent: 3976362 (1976-08-01), Kawakami
Gladstone David J.
Moldram Peter A.
Curtis Marshall M.
The Post Office
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