Small-sized equipment capable of automatically changing the visu

Details Small-sized equipment capable of automatically changing the visu Small-sized equipment capable of automatically changing the visu

1989-02-13

1991-07-23

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340784, G09G 318

Patent

active

050347349

ABSTRACT:
A vehicle-mounted telephone or similar small-sized equipment having a handset with a liquid crystal display (LCD) and a cradle for holding the handset in place. Sensor is built in at least one of the handset and cradle to determine whether or not the handset is present on the cradle. In response to a sense output of the sensor, a controller varies drive voltage which is applied to an LCD driver and thereby varies the visual angle of the LCD automatically. The drive voltage selectively has a first value associated with a first visual angle which occurs when the handset is mounted on the cradle and a second value associated with a second visual angle which occurs when the handset is removed from the cradle. The controller further controls the drive voltage in such a manner as to selectively apply drive voltage associated with any of a desired number of visual angles to the LCD driver. An implementation is provided for allowing a person to manually change the drive voltage in a stepless or analog fashion as desired.

REFERENCES:
patent: 4206318 (1980-06-01), Steely
patent: 4653094 (1987-03-01), Rasmussen et al.
patent: 4788588 (1988-11-01), Tomita
patent: 4860336 (1989-08-01), D'Avello et al.

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