Inverse shadowing in electroluminescent displays

Details Inverse shadowing in electroluminescent displays Inverse shadowing in electroluminescent displays

1985-01-08

1987-02-10

Chatmon, Saxfield

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

315107, 3151694, 313495, 340781, G09G 310

Patent

active

046425241

ABSTRACT:
An apparatus for essentially eliminating variations in luminescence (i.e., inverse shadowing) in an electroluminescent (EL) display is disclosed. The pixels of an EL display are driven to their light emitting voltage with a signal having a rise time dv/dt at and above the pixel light emitting threshold voltage which is independent of the number of pixels ON in each display row. The result is that each ON pixel in the display exhibits substantially the same luminescence.

REFERENCES:
patent: 4443741 (1984-04-01), Tanaka et al.
patent: 4456909 (1984-06-01), Takahara et al.
patent: 4479120 (1984-10-01), Ohba et al.
patent: 4485379 (1984-11-01), Kinoshita et al.
patent: 4535341 (1985-08-01), Kun et al.
patent: 4554539 (1985-11-01), Graves
The AC Thin Film Electroluminescent Display, Display Driver Handbook, 1983, Texas Instruments; pp. 2-33-2-39.

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