Backlight apparatus, control method therefor, and display apparatus
AssigneeCanon Kabushiki Kaisha
InventorMasashi Morishita
Life of this patent
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Abstract
A light source unit that uses white light LEDs in a backlight apparatus is provided with a plurality of white light LEDs that can individually provide white light illumination. Each of the white light LED units respectively corresponds to partition areas in the vertical direction of the screen and is illuminated by scanning in sequence in conformity to the display screen of an LCD display unit. LED units that carry out white light display by RGB color mixing are continuously illuminated. In addition, in another embodiment, white light LEDs are continuously illuminated in a low power consumption mode, and ELD units that carry out white light display by RGB color mixing are illuminated by scanning in sequence in conformity to the display screen of the LCD display device.
Claims16
A light source apparatus provided with a first light source unit comprising light emitting elements that provide white light illumination and a second light source unit comprising a first light emitting element, a second light emitting element, and a third light emitting element having properties that differ from those of the light emitting elements of the first light source unit and that provide white light illumination by color mixing, comprising:
- an illumination control unit configured to activate the first light source unit by repeatedly illuminating in sequence the light emitting elements of the first light source unit in each area of a plurality of partition areas of the first light source unit, while activating the second light source unit by continuously illuminating the light emitting elements of the second light source unit in one frame period, wherein each of the light emitting elements in a first partition area of the plurality of partition areas are illuminated and extinguished prior to illuminating each of the light emitting elements in a second partition area of the plurality of partition areas.
A control method for controlling a light source apparatus comprising a first light source unit comprising light emitting elements that provide white light illumination and a second light source unit comprising a first light emitting element, a second light emitting element, and a third light emitting element having properties that differ from those of the light emitting elements of the first light source unit and that provide white light illumination by color mixing, the method comprising:
- activating the first light source unit by repeatedly illuminating in sequence the light emitting elements of the first light source unit in each area of a plurality of partition areas of the first light source unit, while activating the second light source unit by continuously illuminating the light emitting elements of the second light source unit in one frame period, wherein each of the light emitting elements in a first partition area of the plurality of partition areas are illuminated and extinguished prior to illuminating each of the light emitting elements in a second partition area of the plurality of partition areas.
A light source apparatus provided with a first light source unit comprising light emitting elements that provide white light illumination and a second light source unit comprising a first light emitting element, a second light emitting element, and a third light emitting element having properties that differ from those of the light emitting elements of the first light source unit and that provide white light illumination by color mixing, comprising:
- an illumination control unit configured to activate the first light source unit by repeatedly illuminating in sequence the light emitting elements of the first light source unit in each area of a plurality of partition areas of the first light source unit, while activating the second light source unit by continuously illuminating the light emitting elements of the second light source unit in one frame period, wherein the light emitting element in one of the plurality of partition areas is extinguished prior to illuminating the light emitting element in next partition area.
A control method for controlling a light source apparatus comprising a first light source unit comprising light emitting elements that provide white light illumination and a second light source unit comprising a first light emitting element, a second light emitting element, and a third light emitting element having properties that differ from those of the light emitting elements of the first light source unit and that provide white light illumination by color mixing, the method comprising:
- activating the first light source unit by repeatedly illuminating in sequence the light emitting elements of the first light source unit in each area of a plurality of partition areas of the first light source unit, while activating the second light source unit by continuously illuminating the light emitting elements of the second light source unit in one frame period, wherein the light emitting element in one of the plurality of partition areas is extinguished prior to illuminating the light emitting element in next partition area.
Dependencies are inferred from the claim text.