Display device capable of performing black frame insertion
The present invention discloses a display device capable of performing black frame insertion. The gamma circuit comprises an either-or multiplex selector. The input data of one input end of the selector is a VCOM voltage outputted by the gamma circuit, and the input data of the other input end of the selector is a voltage converted from a predetermined value after digital to analog conversion stored in a multi time programmable memory of the gamma circuit. As the selector selects the VCOM voltage outputted by the gamma circuit under control of the control port, the outputted VCOM voltage is amplified by an operational amplifier in the gamma circuit and then outputted to the source driving circuit to be a first gamma reference voltage which is required as the source driving circuit performs digital to analog conversion.
1. A display device capable of performing black frame insertion, comprising a display screen, and a gate driving circuit and a source driving circuit coupled to the display screen, a gamma circuit and a time sequence control circuit, wherein the gamma circuit comprises an either-or multiplex selector, and input data of one input end of the either-or multiplex selector is a VCOM voltage outputted by the gamma circuit, and input data of the other input end is a voltage converted from a predetermined value after digital to analog conversion stored in a multi time programmable memory of the gamma circuit, and one general purpose input output port of the time sequence control circuit is assigned to be a control port of controlling output of the either-or multiplex selector, and as the either-or multiplex selector selects the VCOM voltage outputted by the gamma circuit under control of the control port, the outputted VCOM voltage is amplified by an operational amplifier in the gamma circuit and then outputted to the source driving circuit to be a first gamma reference voltage which is required as the source driving circuit performs digital to analog conversion, and the time sequence control circuit does not output data as a gamma reference voltage required when the source driving circuit performs digital to analog conversion is the first gamma reference voltage for realizing output of black frame insertion and reducing power consumption of the time sequence control circuit and the source driving circuit.
2. The display device capable of performing black frame insertion according to claim 1 , wherein as the either-or multiplex selector selects outputting the voltage converted from the predetermined value after digital to analog conversion in the multi time programmable memory of the gamma circuit under control of the control port, the outputted voltage after digital to analog conversion is amplified by the operational amplifier and then outputted to the source driving circuit to be a second gamma reference voltage which is required as the source driving circuit performs digital to analog conversion, and the time sequence control circuit transmits normal images when the gamma reference voltage required as the source driving circuit performs digital to analog conversion is the second gamma reference voltage.
3. The display device capable of performing black frame insertion according to claim 2 , wherein the either-or multiplex selector selects outputting the VCOM voltage outputted by the gamma circuit as the control port is set to be low voltage level, and selects outputting the voltage converted from the predetermined value after digital to analog conversion in the multi time programmable memory of the gamma circuit as the control port is set to be high voltage level.
4. The display device capable of performing black frame insertion according to claim 3 , wherein the time sequence control circuit sets voltage level of the control port to be high voltage level as the display screen requires outputting an odd frame of image, and sets voltage level of the control port to be low voltage level as the display screen requires outputting an even frame of image.
5. The display device capable of performing black frame insertion according to claim 3 , wherein the time sequence control circuit sets voltage level of the control port to be low voltage level as the display screen requires outputting an odd frame of image, and sets voltage level of the control port to be high voltage level as the display screen requires outputting an even frame of image.
6. The display device capable of performing black frame insertion according to claim 2 , wherein the either-or multiplex selector selects outputting the VCOM voltage outputted by the gamma circuit as the control port is set to be high voltage level, and selects outputting the voltage converted from the predetermined value after digital to analog conversion in the multi time programmable memory of the gamma circuit as the control port is set to be low voltage level.
7. The display device capable of performing black frame insertion according to claim 6 , wherein the time sequence control circuit sets voltage level of the control port to be high voltage level as the display screen requires outputting an odd frame of image, and sets voltage level of the control port to be low voltage level as the display screen requires outputting an even frame of image.