Control circuit for a liquid crystal display unit

Details Control circuit for a liquid crystal display unit Control circuit for a liquid crystal display unit

1986-09-22

1989-05-23

Miller, Stanley D.

Communications: electrical

Land vehicle alarms or indicators

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

340765, 340805, 340713, G02F 113, G09G 318, G09G 302, G09G 300

Patent

active

048324540

ABSTRACT:
Liquid crystal display units are finding increasing application in electrical appliances used for communications. If the appliance is for example a handset for a mobile radio transceiver and is held in a cradle on the dashboard, the angle of observation will change depending on whether the receiver is placed in the cradle or held in the hand. To ensure that the recognizability of the displayed information is not impaired upon a change in the position of the receiver, a control circuit automatically changes the contrast when such a change takes place. The circuitry required for this control is particularly simple when two different voltage values are generated by means of a switchable voltage-divider for two preset positions of the appliance. The switching takes place between the two voltage values in dependence upon the position of the cradle hook switch. The contrast (i.e. the amplitude of the voltage) is increased to a level which ensures that the displayed information is clearly legible from the new angle of observation.

REFERENCES:
patent: 4236150 (1980-11-01), Chern
patent: 4383737 (1983-05-01), Hibino et al.
patent: 4425027 (1984-01-01), Portman
patent: 4462027 (1984-07-01), Lloyd
patent: 4662718 (1987-05-01), Masubuchi
P. H. Smith, "Cut LCD-Digital-Interface Design Time and Hardware Co sts with Standard Chips", Electronic Design, vol. 27, No. 19, Sep. 13, 79, p. 118.

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