Matrix display devices with redundant driving transistor arrange

Details Matrix display devices with redundant driving transistor arrange Matrix display devices with redundant driving transistor arrange

1988-05-26

1989-07-25

Britton, Howard W.

Communications: electrical

Visual indication

Movable

340719, 340784, 350333, 358236, G09G 336

Patent

active

048518271

ABSTRACT:
In a matrix display device, such as an LCD-TV, supply of data signals to each one of an array of display elements is controlled by respective switching devices circuits in response to applied switching signals. Each switching device circuit is fault-tolerant and has two branches each containing two series-connected transistors, e.g. TFTs, and connected in parallel between a data signal input and a display element electrode with the transistor gates being connected to a common switching signal input. For commonly-occuring transistor defects such a circuit can tolerate a defective transistor, thereby improving fabrication yields. Further transistor defects are accommodated for improved fault tolerance by provision of impedances (38) in the gate supply lines. The impedance may be resistors or active loads (41).

REFERENCES:
patent: 4368523 (1983-01-01), Kawate
patent: 4680580 (1987-07-01), Kawahara
patent: 4775861 (1988-10-01), Saito
patent: 4792210 (1988-12-01), Maurice

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