Backlight Device, Display Device, and Television Receiver
OwnerRyuhei Kishimotoinventor
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Abstract
In one embodiment of the present invention, a backlight device includes six light source units including cold-cathode tubes (linear light sources) and driving circuits for driving the respective cold-cathode tubes. The light source units are arranged in a direction perpendicular to a longitudinal direction of the cold-cathode tubes. In one embodiment of the backlight device, an inverter controller (control portion) turns on the cold-cathode tubes included in each of two light source units that are adjacent in the direction perpendicular to the longitudinal direction while phases of on-time/off-time cycles of PWM dimming of the two adjacent light source units are shifted from each other.
Claims16
A backlight device comprising:
- a linear light source;
- a light-emitting surface from which light of the linear light source is emitted toward an outside;
- a light source unit that comprises the linear light source and a driving circuit for driving the liner light source;
- and
- a control portion that receives a dimming indication signal to change brightness of the light-emitting surface and controls driving of the light source unit based on the input dimming indication signal,
- wherein a plurality of light source units are provided in a direction perpendicular to a longitudinal direction of the linear light source, and
- the control portion turns on the linear light sources included in each of two light source units that are adjacent in the direction perpendicular to the longitudinal direction while phases of on-time/off-time cycles of PWM dimming of the two adjacent light source units are shifted from each other.
Dependencies are inferred from the claim text.