Electronic drive circuits for active matrix devices, and a metho

Details Electronic drive circuits for active matrix devices, and a metho Electronic drive circuits for active matrix devices, and a metho

1993-09-14

1995-11-07

Karlsen, Ernest F.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

345 93, G01R 3102, G09G 318

Patent

active

054650534

ABSTRACT:
A shift register or other electronic drive circuit, for an LCD or other active matrix device includes a series of circuit blocks each having redundancy in the form of parallel circuit paths. When the circuit is turned on, self-testing and redundancy selection is carried out by individual test and control arrangements which are associated with the circuit blocks. The test and control arrangements may comprise memory elements, such as a bistable, which electrically program themselves in response to their electrical testing of the circuit paths so as to generate a control signal at an output coupled to one or more output switches. The output switches control which of the parallel circuit paths provides an output to the active matrix device. Each test and control arrangement also comprises a routing circuit controlled by the control signal, for transmitting the correct serial output of that circuit to all serial inputs of a next circuit block.

REFERENCES:
patent: 4820222 (1989-04-01), Holmberg et al.
patent: 5063378 (1991-11-01), Roach
patent: 5067021 (1991-11-01), Brody
patent: 5113134 (1992-05-01), Plus et al.
patent: 5162931 (1992-11-01), Holmberg
patent: 5173792 (1992-12-01), Matsueda
patent: 5235272 (1993-08-01), Henley
patent: 5260818 (1993-11-01), Wu

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