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US 8,711,080 B2Granted
Backlight assembly, method for driving backlight assembly, and liquid crystal display having the same
AssigneeSamsung Display Co., Ltd.
InventorsDong Min Yeo, Gi Cherl Kim, Byung Choon Yang, Se Ki Park, Yong Hoon Kwon
Life of this patent
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Abstract
There is provided a backlight assembly that supplies light to an LCD panel. The backlight assembly includes an LED assembly and a backlight unit. The LED assembly includes at least one LED block region having a plurality of LEDs. The backlight unit driving unit includes a color control unit that determines a representative color of the LED block region using an image signal supplied to the LCD panel, and a dimming control unit that controls the color of the LED block region based on the representative color determined by the color control unit.
Claims20
A backlight assembly that supplies light to a liquid crystal display panel, the backlight assembly comprising:
- a light emitting diode assembly comprising at least one light emitting diode block region having a plurality of light emitting diodes;
- a backlight unit driving unit comprising a color control unit configured to determine a representative color of the light emitting diode block region using at least one image signal supplied to the liquid crystal display panel, wherein color classes are determined for the at least one image signal, wherein the color classes are mapped into color regions in a color coordinate system, wherein the color regions are determined according to visibilities, wherein the color control unit defines a visibility associated with a color region in the color coordinate system into which the color classes of the at least one image signal are most frequently mapped as the representative color of the light emitting diode block region, and wherein at least one color class of the color classes of the at least one image signal corresponds to a plurality of color gradations;
- and
- a dimming control unit configured to control color of the light emitting diode block region based on the representative color of the light emitting diode block region determined by the color control unit,
- wherein the light emitting diode assembly comprises red light emitting diodes, green light emitting diodes, blue light emitting diodes, and white light emitting diodes, and
- wherein brightness of the light emitting diode assembly is adjusted by adjusting brightness of the white light emitting diodes without adjusting brightness of the red light emitting diodes, the green light emitting diodes, or the blue light emitting diodes.
3 more elements
A liquid crystal display comprising:
- a liquid crystal display panel configured to display images, the liquid crystal display panel including a plurality of liquid crystal display panel block regions;
- a liquid crystal display panel driving unit configured to drive the liquid crystal display panel;
- a light emitting diode assembly that supplies light to the liquid crystal display panel and comprises a plurality of light emitting diode block regions including at least one light emitting diode block region and having a plurality of light emitting diodes;
- and
- a backlight unit driving unit comprising a color control unit configured to determine a representative color set of the light emitting diode block region using at least one image signal supplied to the liquid crystal display panel, the backlight unit driving unit further comprising a dimming control unit configured to control colors of the light emitting diode block region based on the representative color set of the light emitting diode block region determined by the color control unit, wherein color classes are determined for the at least one image signal, wherein the color classes are mapped into color regions in a color coordinate system, wherein the color regions are determined according to visibilities, wherein the color control unit defines a color region in the color coordinate system into which the color classes of the at least one image signal are most frequently mapped as the representative color set of the light emitting diode block region, and wherein at least one color class of the color classes of the at least one image signal corresponds to a plurality of color gradations,
- wherein the light emitting diode assembly comprises red light emitting diodes, green light emitting diodes, blue light emitting diodes, and white light emitting diodes, and
- wherein brightness of the light emitting diode assembly is adjusted by adjusting brightness of the white light emitting diodes without adjusting brightness of the red light emitting diodes, the green light emitting diodes, or the blue light emitting diodes.
4 more elements
A method for driving backlight assembly, the method comprising:
- classifying color classes of liquid crystal display panel block regions using color class table information;
- determining a representative color using color classes of at least one image signal corresponding to a liquid crystal display panel block region among the liquid crystal display panel block regions, wherein the determining the representative color comprises:
- mapping the color classes of the at least one image signal into color regions in a color coordinate system, wherein the color regions are determined according to visibilities, and determining a visibility associated with a color region into which the color classes of the at least one image signal are most frequently mapped in the color coordinate system as the representative color corresponding to the liquid crystal display panel block region, wherein at least one color class of the color classes of the at least one image signal corresponds to a plurality of color gradations;
- adjusting at least a color of a light emitting diode block region corresponding to the liquid crystal display panel block region according to the representative color;
- and
- adjusting brightness of a light emitting diode assembly that comprises the light emitting diode block region by adjusting brightness of white light emitting diodes of the light emitting diode assembly without adjusting brightness of red light emitting diodes, green light emitting diodes, or blue light emitting diodes of the light emitting diode assembly.
3 more elements
Dependencies are inferred from the claim text.