Display device and display method

A display device with a display panel and a backlight for the display panel, the display device comprising:

• control means configured to output a control signal for controlling illumination and extinction of the backlight, to the backlight;
• update means configured to update at least a first sub-frame and a second sub-frame in each predetermined period in order to change one image displayed on a screen of the display panel, and
• wherein the control means outputs a control signal for controlling the backlight so that the backlight starts to illuminate at some point in time from the start of update of the second sub-frame in one period until the finish of the update and ends illumination at the time point when the update means starts to update the first sub-frame in a period subsequent to the one period or after the time point;
• wherein the update means updates a plurality of sub-frames comprising the first sub-frame and the second sub-frame in the respective predetermined periods,
• when Tg>0, the control means outputs a control signal so that Tg>Te,
• Tg represents a time represented by a formula {Td−[Tc−(Ta+Tb)]},
• Ta represents a time required to update one sub-frame,
• Tb represents a response time corresponding to a change in a gradation value of the display panel,
• Tc represents the predetermined period,
• Td represents a time from the time point when the backlight starts to illuminate after the update means starts to update the second sub-frame in one period to the time point when the update means starts to update the first sub-frame in a period subsequent to the one period, and
• Te represents a time from the time point when the update means starts to update the first sub-frame in a period subsequent to the one period to the time point when the backlight ends illumination.