Portable electroluminescent back light

Details Portable electroluminescent back light Portable electroluminescent back light

1988-11-23

1991-07-09

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340781, 340784, 350345, G09G 330

Patent

active

050309439

ABSTRACT:
A back light for a liquid crystal display has a self-contained power source and can be attached to the unit having the liquid crystal display when needed in a dark ambient, and removed from the display or not carried by the user of the display when not needed. This portable back light allows the unit with the liquid crystal display to be smaller and lighter in weight than a unit having a built-in back light, and to require a smaller power supply than a unit with a built-in back light. Additinally batteries supplying power to a liquid crystal display unit will last longer. Yet with this portable back light, the user has the convenience of sufficient brightness for viewing the liquid crystal display unit when needed.

REFERENCES:
patent: 3722206 (1973-03-01), Bergey
patent: 4561044 (1985-12-01), Ogura et al.
patent: 4562478 (1985-12-01), Hirasawa et al.
patent: 4652932 (1987-03-01), Miyajima et al.
patent: 4809078 (1989-02-01), Yabe et al.
patent: 4846694 (1989-07-01), Erhardt

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