Portable microcomputer with power-sparing system of illuminated

Details Portable microcomputer with power-sparing system of illuminated Portable microcomputer with power-sparing system of illuminated

1991-06-12

1995-04-11

Brier, Jeffery

Communications: electrical

Visual indication

Having light piping

345113, G09G 336

Patent

active

054062683

ABSTRACT:
A portable microcomputer has a battery for powering the microcomputer. A display has a light source for illuminating the display. A system of illuminated indicators for indicating various operating states or functions of the microcomputer comprises a plurality of passive illuminated indicators, each deriving its visual signaling energy solely from the light source, and at least one active illuminated indicator indicating a condition related to the electrical power for the microcomputer and electrically powered by the battery. The passive indicators are effective, with no drain on the battery, except to change the state of an associated shutter, to provide necessary or desirable indications of various operating states or functions of the microcomputer when the microcomputer is being used and the display is active, only the active indicator draining the battery to provide said indication of electrical power.

REFERENCES:
patent: 3647986 (1972-03-01), Lace et al.
patent: 4716412 (1987-12-01), Arnoux et al.
patent: 4864523 (1989-09-01), Sasaki
patent: 4945350 (1990-07-01), Kawamura
patent: 4965564 (1990-10-01), Fabry et al.
patent: 5053765 (1991-10-01), Sonehara et al.
patent: 5068652 (1991-11-01), Kobayashi
Battery Watch II advertisement, PC Magazine vol. 9 No. 5 p. 139, Mar. 1990.

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