Liquid crystal display circuit

Claim 1

A liquid crystal display circuit comprising: a liquid crystal display (LCD) having a plurality of display pixels; display bias producing means for producing display bias voltages used to cause the display pixels to display information; a plurality of power supply means; power supply switching means for switching power supply to the bias producing means from among the plurality of power supply means in response to a power supply switching command signal extremely supplied to the LCD circuit; duty changing means for producing an output signal for designating a driving duty cycle of the LCD to be one of a plurality of driving duty cycle modes including at least a first driving duty cycle mode and a second driving duty cycle mode in response to the power supply switching command signal, said driving duty cycle modes being in units of 1/n, where n is an integer, and said display pixels including first display pixels operable in either one of said first driving duty cycle mode and said second driving duty cycle mode and second display pixels operable only in said second driving duty cycle mode; and display driving means for producing a signal for causing one of (a) both the first display pixels and the second display pixels or (b) only said first display pixels to display information in accordance with the display bias voltages produced by the display bias producing means and the output signal from said duty changing means designating one of said first driving duty cycle mode and said second driving duty cycle mode.