| 主权项 |
1. A display device, comprising:
a display panel that displays a frame image for each one frame period; and a backlight unit that illuminates the display panel from a rear face of the display panel, wherein the backlight unit includes:
a first light source unit that illuminates the display panel;a second light source unit that illuminates the display panel; anda control unit that outputs a drive signal to the first light source unit to drive the first light source unit during a first drive period in the one frame period, and a drive signal to the second light source unit to drive the second light source unit during a second drive period in the one frame period after the driving of the first light source unit is started, and the control unit:
drives the first light source unit and the second light source unit so that the one frame period has an overlapped period, in which the first drive period and the second drive period overlap each other;outputs a PWM signal as the drive signal to the first light source unit in the overlapped period, and a PWM signal as the drive signal to the second light source unit in the overlapped period, each of the PWM signals turning the first light source unit and the second light source unit on and off with a predetermined pulse width;shifts a phase of the PWM signal to be outputted to the first light source unit and a phase of the PWM signal to be outputted to the second light source unit from each other,outputs, as the drive signal, a rectangular wave signal to the first light source unit during a period other than the overlapped period in the first drive period, to drive the first light source unit so that a current value of the first light source unit becomes a first current value; andoutputs, as the drive signal, a rectangular wave signal to the second light source unit during a period other than the overlapped period in the second drive period, to drive the second light source unit so that a current value of the second light source unit becomes a second current value, wherein the control unit increases, when outputting the PWM signal, a current value to be larger than the first current value when the first light source unit is on, and increases, when outputting the PWM signal, a current value to be larger than the second current value when the second light source unit is on, each of the periods other than the overlapped period in the first drive period is longer than each period of the PWM signals turning the first light source unit on, and each of the periods other than the overlapped period in the second drive period is longer than each period of the PWM signals turning the second light source unit on. |
