Gamma voltage regulation circuit, and display device

A gamma voltage regulation circuit, which is applied to a display device, the display device comprising a timing sequence controller for outputting a timing sequence control signal, wherein the gamma voltage regulation circuit comprises:

• a gamma voltage input port and a gamma voltage output port;
• a switching controlling circuit, which connects to the timing sequence controller, the switching controlling circuit is configured to generate a corresponding control signal according to the timing sequence control signal received, the control signal comprises a first control signal, a second control signal, a third control signal, and a forth control signal;
• a primary gamma voltage regulation branch circuit, configured to output a first gamma voltage input from the gamma voltage input port when receiving the first control signal, or to convert the first gamma voltage input from the gamma voltage input port to a second gamma voltage when receiving the second control signal and then to output the second gamma voltage;
• a secondary gamma voltage regulation branch circuit, configured to output the second gamma voltage when receiving the third control signal, or to convert the second gamma voltage input from the gamma voltage input port to a third gamma voltage when receiving the forth control signal and then to output the third gamma voltage.

A display device, wherein the display device comprises a gamma voltage generation circuit, a source driving circuit, a timing sequence controller, and a gamma voltage regulation circuit, the gamma voltage regulation circuit is connected in series between the gamma voltage generation circuit and the source driving circuit, a controlled port of the gamma voltage regulation circuit connects to a controlling port of the timing sequence controller;

• the gamma voltage regulation circuit comprises:
• a gamma voltage input port and a gamma voltage output port;
• a switching controlling circuit, configured to generate a first control signal or a second control signal according to the timing sequence control signal received;
• a gamma voltage output circuit, configured to switch on when receiving the first control signal, to output a first gamma voltage input from the gamma voltage input port to the gamma voltage output port;
• and
• a gamma voltage processing circuit, configured to convert the first gamma voltage input from the gamma voltage input port to a second gamma voltage when receiving the second control signal, and then to output the second gamma voltage to the gamma voltage output port, wherein the gamma voltage output circuit comprises a third switching tube, an input port of the third switching tube connects to the gamma voltage input port, an output port of the third switching tube connects to the gamma voltage output port, a controlled port of the third switching tube connects to an output port of the first switching tube and an output port of the second switching tube.