Patent ID: 7170507

Claim:
A liquid crystal driving semiconductor chip comprising: a control section which stores display data into a memory section in accordance with an operation control signal; a drive section which drives a liquid crystal display in accordance with said display data stored in said memory section; a power-supply electrode to which power is supplied from an external power supply circuit; a monitor electrode which is supplied with a power supply potential of said power supply circuit in a path different from a path for said power supplied from said power supply circuit; a control electrode to be supplied with a control signal to enable an operation of said control section; a CMOS inverter which detects a logical level of said control signal to be supplied to said control electrode; and a level monitor section which has an MOS transistor for detecting a logical level of said power supply potential to be supplied to said monitor electrode, outputs a detection signal from said CMOS inverter to said control section as said operation control signal when said MOS transistor detects a correct logical level, and stops outputting said operation control signal when said MOS transistor does not detect the correct logical level.