DISPLAY DEVICE AND METHOD FOR CONTROLLING DISPLAY DEVICE
First Claim
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, whereinthe backlight unit includes;
a first light source unit that illuminates the display panel;
a second light source unit that illuminates the display panel; and
a 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, andthe 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; and
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.
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Accused Products
Abstract
A display device has a display panel and a backlight unit. The backlight unit includes first and second light source units, and a control unit that outputs a drive signal to the light source units to drive the first and second light source units during first and second drive periods in one frame period respectively. The control unit drives the light source units so that the one frame period has an overlapped period, in which the first and second drive periods overlap. The control unit outputs PWM signals to turn the light source units on and off to the light source units respectively. The control unit 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.
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Citations
8 Claims
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1. A display device, comprising:
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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; and a 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; and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling a display device that has a display panel which 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, the backlight unit including a first light source unit that illuminates the display panel, and a second light source unit that illuminates the display panel, the method comprising:
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a first step of outputting 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 second step of outputting 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, wherein the first light source unit and the second light source unit are driven in the first step and the second step so that the one frame period has an overlapped period, in which the first drive period and the second drive period overlap each other, a PWM signal is outputted, as the drive signal, to the first light source unit in the overlapped period in the first step, the PWM signal turning the first light source unit on and off with a predetermined pulse width, a PWM signal is outputted, as the drive signal, to the second light source unit in the overlapped period in the second step, the PWM signal turning the second light source unit on and off with a predetermined pulse width, and 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 are shifted from each other in the first step and the second step.
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Specification