Reference voltage generation method and circuit, display drive circuit and display device with gamma correction and reduced power consumption

摘要

There are provided a reference voltage generation circuit, a display drive circuit, a display device and a reference voltage generation method capable of reducing consumption of current even when the polarity inversion drive is carried out. A reference voltage generation circuit includes a positive polarity ladder resistor circuit including a first ladder resistor circuit having resistance ratio for a positive polarity and a negative polarity ladder resistor circuit including a second ladder resistor circuit having resistance ratio for a negative polarity. First to 2i-th reference voltage output switching circuits are respectively inserted between first to i-th and (i + 1)th to 2i-th division nodes and first to i-th reference voltage output nodes. The positive polarity ladder resistor circuit generates a reference voltage at a positive polarity inversion period and the negative polarity ladder resistor circuit generates a reference voltage at a negative polarity inversion period.