Gamma Voltage Driving Circuit, Source Driving Module, and Liquid Crystal Panel

摘要

The present invention discloses a Gamma voltage driving circuit, which comprises a voltage dividing resistor string, which comprises 2n resistors connected in series sequentially, used to divide a reference voltage into 2n Gamma voltages; wherein, n is an integer not less than 1; a reference voltage module, which provides the reference voltage for the voltage dividing resistor string; a voltage selecting module, which is used to selectively output one of the 2n Gamma voltages. The reference voltage module comprises a first reference voltage and a second reference voltage, the first reference voltage is coupled to one end of the voltage dividing resistor string, the second reference voltage is coupled between the 2n/2-th resistor and the (2n/2+1)-th resistor; wherein, the voltage selecting module comprises 2n−1 transmission lines, which respectively connects the voltage dividing nodes of the first to (2n/2−1)-th resistors and the (2n/2+1)-th to 2n-th resistors in the voltage dividing resistor string to a output terminal; and each transmission line is provided with n−1 switching units.

主权项

1. A Gamma voltage driving circuit, used to generate multiple Gamma voltages, comprising:
a voltage dividing resistor string, which comprises 2n resistors connected in series sequentially, used to divide a reference voltage into 2n Gamma voltages; wherein, n is an integer not less than 1; a reference voltage module, which provides reference voltage for the voltage dividing resistor string; a voltage selecting module, which is used to selectively output one of the 2n Gamma voltages; wherein, the reference voltage module comprises a first reference voltage and a second reference voltage, the first reference voltage is coupled to one end of the voltage dividing resistor string, the other end of the voltage dividing resistor string is connected to the ground; the second reference voltage is coupled between the 2n/2-th resistor and the (2n/2+1)-th resistor, wherein, the value of the second reference voltage is 1/2 of that of the first reference voltage; wherein, the voltage selecting module comprises 2n−1 transmission lines, which respectively connects the voltage dividing nodes of the first to (2n/2−1)-th resistors and the (2n/2+1)-th to 2n-th resistors in the voltage dividing resistor string to a output terminal; and each transmission line is provided with n−1 switching units.