GREY-SCALE VOLTAGE GENERATION CIRCUIT AND METHOD, SOURCE DRIVE CHIP AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

A grey-scale voltage generation circuit and method, a source drive chip and a liquid crystal display device. The grey-scale voltage generation circuit comprises: a voltage division circuit (1) which is used for performing voltage division on a plurality of gamma reference voltages (V1-Vm) to generate a plurality of grey-scale voltages (G0-Gn); a plurality of output branches (2) which are connected to different positions of the voltage division circuit (1) and used for outputting the grey-scale voltages (G0-Gn); and a plurality of access ends (3) which are connected to the voltage division circuit (1) and used for connecting the gamma reference voltages (V1-Vm), wherein at least one of the access end (3) is connected to different positions of the voltage division circuit (1) through a plurality of access branches (31), and each of access branches (31) is provided thereon with a control unit for controlling a switch (311). The grey-scale voltage generation circuit provided in the present invention can solve the technical problem of grey-scale loss when a liquid crystal display device uses a backlight source unit with dynamically changing brightness.