Common voltage adjustment apparatus

摘要

A common voltage adjustment apparatus for adjusting a common voltage of a liquid crystal display (LCD) panel includes a data-read-write circuit and an output circuit. The data-read-write circuit includes a one-time-programmable (OTP) memory module and a control interface unit. The OTP memory module includes several OTP memories. The control interface unit outputs common-voltage-setting data according to a control signal and selectively stores the common-voltage-setting data into an unwritten OTP memory in the OTP memory module. The output circuit includes a reference-voltage generator and a digital-to-analog converter (DAC). The reference-voltage generator generates a reference voltage. The DAC converts the common-voltage-setting data into an output voltage according to the reference voltage.