Electronic device with feedback loop

Details Electronic device with feedback loop Electronic device with feedback loop

1994-07-13

1995-10-17

Weldon, Ulysses

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 92, 345100, G09G 336

Patent

active

054594839

ABSTRACT:
Thin-film circuits comprising e.g. TFTs have inferior performance as compared with monolithic integrated circuits, and this inferior performance limits their use for e.g. drive circuits in large-area electronic devices such as an active matrix liquid-crystal display. In accordance with the invention, feedback with an external amplifier (150) is used to enhance the performance of a thin-film circuit. The feedback is taken from parallel nodes (40) of sequential stages (T1) of the circuit so that a common feedback line (51) and common external amplifier (150) can be used, thus reducing the number of substrate terminals and external connections required. Various buffers may be included between the feedback line (51) and the feedback terminal (56) to reduce the capacitive load on the line (51).

REFERENCES:
patent: 4429305 (1984-01-01), Hosokawa et al.
patent: 4804951 (1989-02-01), Yamashita et al.
patent: 5051739 (1991-09-01), Hayashida et al.

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