Display device and control method for suppressing deterioration in image quality and reducing power consumption
A display device includes multiple scan lines arranged in a display region; a first scan line driving circuit outside the display region that is connected to multiple scan lines at one end in an extending direction and supplies voltages to multiple scan lines; a second scan line driving circuit outside the display region that is connected to multiple scan lines at the other end in the extending direction and supplies voltages to multiple scan lines; and a control circuit. The control circuit alternately drives either the first scan line driving circuit or the second scan line driving circuit for each predetermined frame when a refresh rate of an image displayed according to a video signal is a first refresh rate, and drives both the first scan line driving circuit and the second scan line driving circuit at a second refresh rate higher than the first refresh rate.
1 . A display device comprising:
a plurality of scan lines arranged side by side in a display region;
a first scan line driving circuit, that is disposed outside the display region, supplying a first voltage to the plurality of scan lines;
a second scan line driving circuit, that is disposed outside the display region, supplying a second voltage to the plurality of scan lines; and
a control circuit configured to alternately drive either the first scan line driving circuit or the second scan line driving circuit in adjacent predetermined frames when a refresh rate of an image displayed according to a video signal is a first refresh rate, and to drive both the first scan line driving circuit and the second scan line driving circuit at a second refresh rate that is higher than the first refresh rate, wherein
each of the plurality of scan lines is connected, in an extending direction of the plurality of scan lines, to the first scan line driving circuit at one end and is connected to the second scan line driving circuit at another end, and
the control circuit is further configured to control the first scan line driving circuit and the second scan line driving circuit to output scan line signals to the plurality of scan lines from either the one end or the other end in adjacent predetermined frames when the refresh rate is the first refresh rate, and to output scan line signals to the plurality of scan lines from both the one end and the other end when the refresh rate is the second refresh rate.
2 . The display device according to claim 1 , wherein the control circuit is further configured to determine whether the refresh rate of the image is the first refresh rate or the second refresh rate based on synchronization signal information about the video signal.
3 . The display device according to claim 1 ,
wherein, a first time duration, during which the first scan line driving circuit and the second scan line driving circuit supply gate-on voltages to the plurality of scan lines when the refresh rate of the image is the first refresh rate, is longer than a second time duration, during which the first scan line driving circuit and the second scan line driving circuit supply the gate-on voltages to the plurality of scan lines when the refresh rate of the image is the second refresh rate.
4 . The display device according to claim 1 , wherein
each of the first scan line driving circuit and the second scan line driving circuit includes switches disposed in supply paths of voltages supplied to the plurality of scan lines, and
alternately driving either the first scan line driving circuit or the second scan line driving circuit in the adjacent predetermined frames includes turning ON a switch in one of the first scan line driving circuit and the second scan line driving circuit, while turning OFF a switch in another one of the first scan line driving circuit and the second scan line driving circuit for each predetermined frame.
5 . A control method performed by a liquid crystal display panel in which a plurality of scan lines is arranged side by side in a display region and the liquid crystal display panel includes first and second scan line driving circuits that are disposed outside the display region and that supply voltages to the plurality of scan lines, the control method comprising:
alternately driving either the first scan line driving circuit or the second scan line driving circuit in adjacent predetermined frames when a refresh rate of an image displayed according to a video signal is a first refresh rate; and
driving both the first scan line driving circuit and the second scan line driving circuit at a second refresh rate that is higher than the first refresh rate, wherein
each of the plurality of scan lines is connected, in an extending direction of the plurality of scan lines, to the first scan line driving circuit at one end and is connected to the second scan line driving circuit at another end, and
the control method further comprises controlling the first scan line driving circuit and the second scan line driving circuit to output scan line signals to the plurality of scan lines from either the one end or the other end in adjacent predetermined frames when the refresh rate is the first refresh rate, and to output scan line signals to the plurality of scan lines from both the one end and the other end when the refresh rate is the second refresh rate.