Matrix display device and its method of operation

Details Matrix display device and its method of operation Matrix display device and its method of operation

1994-09-30

1995-06-27

Weldon, Ulysses

Computer graphics processing and selective visual display system

Display driving control circuitry

Physically integral with display elements

345212, 359 86, G09G 300

Patent

active

054283701

ABSTRACT:
A matrix display device comprises a row and column array of picture elements (12) each of which consists of a display element (14), e.g. a LC display element, connected in series with a two-terminal non-linear device 15, such as a MIM, between associated row and column address conductors (16,17) to which selection and data signals are applied by a scanning signal drive circuit (20) and a data signal drive circuit (22) respectively, and a reference element circuit (34), comprising a non-linear device (35) in series with a capacitor (36), forming part of a feedback arrangement through which picture element drive voltages are controlled (25) so as to compensate for the effects of aging of the non-linear devices. The reference circuit is driven like the picture elements, with a scanning signal waveform and voltage signal (V.sub.A) applied to opposite sides, and the picture element drive voltages are adjusted in accordance with predetermined changes in the voltage across the capacitor (36). The reference non-linear device (35) can be provided on the same support (10 ) as the picture element devices (15). The capacitor (36) can be constituted by an electro-optic element corresponding to the display elements (14). A plurality of such reference circuits may be employed, extending in one or more rows and driven by row and column conductors.

REFERENCES:
patent: 4298866 (1981-11-01), Hodemaekers
patent: 4460247 (1984-07-01), Hilsum et al.
patent: 5014048 (1991-05-01), Knapp

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