Patent ID: 7825920
Filing Date: 2010-11-02
Classification: G09G

Abstract:
1. A level regulation circuit of a common signal of a Liquid Crystal Display (LCD), comprising: an operational amplifier, comprising a positive input end, a negative input end, and an output end; a first resistor, comprising a first end electrically connected to the negative input end of the operational amplifier, and a second end electrically connected to a ground end; a second resistor, comprising a first end electrically connected to the positive input end of the operational amplifier, and a second end for receiving a common voltage; a third resistor, comprising a first end electrically connected to the positive input end of the operational amplifier, and a second end for receiving a reference voltage; a fourth resistor, comprising a first end electrically connected to the negative input end of the operational amplifier, and a second end electrically connected to the output end of the operational amplifier; and a Zener diode, comprising a first end electrically connected to the output end of the operational amplifier for outputting a first level voltage of the common signal, and a second end electrically connected to the ground end through an output resistor for outputting a second level voltage of the common signal.