Tokyo Shibaura Denki Kabushiki Kaisha

Ryo Mitani

Atsushi Kobayashi

Yoshiaki Moriya

A data transfer control device is provided having a plurality of shift registers connected through said multiplexers in a closed loop, a selector connected to the inputs of said multiplexer and for selecting a transfer destination of display data according to a common electrode select signal of a display unit, and a gate for selecting the polarity of the display data to be loaded into said shift registers according to the polarity of common output signals for scanning common electrodes of said display unit.

Data transfer control device

A liquid crystal driver circuit has first to fourth resistors serially connected between a positive power source terminal and a reference power source terminal, first and second MOS transistors respectively connected in parallel with the first and fourth resistors, a common electrode driver circuit for generating common electrode bias signals in accordance with common electrode selection signals, and a segment electrode driver circuit for generating segment electrode bias signals in accordance with segment data. A third switching MOS transistor is coupled between the reference power source terminal and the series circuit of the first to fourth resistors.

Liquid crystal driver circuit

A power source voltage change discrimination circuit includes a voltage selection circuit for selectively supplying the greater one of main and auxiliary power source voltages, and a series circuit of a resistor and a capacitor coupled between the output terminal of the voltage selection circuit and ground. There is further provided a Schmitt circuit having hysteresis characteristics whose input terminal is coupled to a junction of the resistor and capacitor.

Growing community of inventors

Yokohama, Japan

Ryo Mitani