Electronic calculating apparatus

Details Electronic calculating apparatus Electronic calculating apparatus

1996-03-26

1998-11-17

Dowling, William

Optics: image projectors

Miscellaneous

353DIG3, G03B 2114

Patent

active

058366660

ABSTRACT:
An electronic calculating apparatus for use with an overhead projector and a projection screen includes an electronic calculator and a display device. The electronic calculator comprises a data input unit and a data sending unit. The electronic calculator performs an operation corresponding to data inputted from the data input unit, and displays a result of the performed operation. The display device comprises a liquid crystal display unit of a transparent type and a data receiving unit for receiving data sent from the sending unit of the electronic calculator. The display device is placed on the top of the overhead projector, and, upon receipt of the data sent from the data sending unit of the electronic calculator, the display device performs an operation that is substantially the same as the operation performed by the electronic calculator, and displays the result of the performed operation on the liquid crystal display unit of a transparent type. The result of the operation displayed on the liquid crystal display unit of a transparent type is enlarged and projected through the overhead projector onto the projection screen.

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IEEE Spectrum, No. 12, Dec. 1991, New York, p. 6 XP000276475, "Innovations: Writing On The Wall".

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