Backlight assembly of liquid crystal display
First Claim
1. A backlight assembly having a plurality of light emitting diodes (LEDs) and a light guide plate for uniformly guiding light emitted from the LEDs to a liquid crystal substrate, the backlight assembly comprising:
- a first reflective structure having at least one reflective surface facing a corresponding LED and tilted at a constant angle and a second reflective structure being independently disposed and spaced a distance from the first reflective structure,wherein each LED is disposed to emit light to a direction substantially perpendicular to a longitudinal bisector of the light guide plate toward each facing reflective surface and none of the LEDs are disposed to emit light to a direction substantially parallel to the longitudinal bisector of the light guide plate,wherein each LED corresponds to a single reflective surface so that the ratio of LEDs to reflective surfaces in the backlight assembly is 1 to 1,wherein the light emitted from each of the LEDs is reflected by the corresponding reflective surface to be incident on the light guide plate in a form of line-shaped light,wherein the backlight assembly includes at least four combinations of a LED and a corresponding reflective surface and the combinations are disposed substantially symmetrically about the longitudinal bisector of the light guide plate, andwherein all of the LEDs are arranged along a common line that extends along a side of the light guide plate, and that common line is substantially perpendicular to the longitudinal bisector of the light guide plate.
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Accused Products
Abstract
A backlight assembly having a plurality of light emitting diodes (LEDs) and a light guide plate for uniformly guiding light emitted from the LEDs to a liquid crystal substrate is provided. The backlight assembly includes a reflective structure having at least one reflective surface facing the LEDs and tilted at a constant angle. The light emitted from the LEDs is reflected by the reflective surface to have the shape of light emitted from a line light source and be incident on the light guide plate. In effect, hot spots degrading screen quality and screen brightness distribution non-uniformity can be prevented.
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Citations
27 Claims
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1. A backlight assembly having a plurality of light emitting diodes (LEDs) and a light guide plate for uniformly guiding light emitted from the LEDs to a liquid crystal substrate, the backlight assembly comprising:
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a first reflective structure having at least one reflective surface facing a corresponding LED and tilted at a constant angle and a second reflective structure being independently disposed and spaced a distance from the first reflective structure, wherein each LED is disposed to emit light to a direction substantially perpendicular to a longitudinal bisector of the light guide plate toward each facing reflective surface and none of the LEDs are disposed to emit light to a direction substantially parallel to the longitudinal bisector of the light guide plate, wherein each LED corresponds to a single reflective surface so that the ratio of LEDs to reflective surfaces in the backlight assembly is 1 to 1, wherein the light emitted from each of the LEDs is reflected by the corresponding reflective surface to be incident on the light guide plate in a form of line-shaped light, wherein the backlight assembly includes at least four combinations of a LED and a corresponding reflective surface and the combinations are disposed substantially symmetrically about the longitudinal bisector of the light guide plate, and wherein all of the LEDs are arranged along a common line that extends along a side of the light guide plate, and that common line is substantially perpendicular to the longitudinal bisector of the light guide plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A backlight assembly having a plurality of light emitting diodes (LEDs) and a light guide plate for uniformly guiding light emitted from the LEDs to a liquid crystal substrate, the backlight assembly comprising:
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one group consisting of a pair of LEDs facing each other, and a first reflective structure having two reflective surfaces disposed between the LEDs, each reflective surface facing one of the LEDs, and being tilted at a constant angle; one set symmetrically disposed at each of opposite sides of the group as a reference, each set consisting of one LED, and a second reflective structure having a reflective surface tilted at a constant angle, the second reflective structure being independently disposed and spaced a distance from the first reflective structure, wherein each LED corresponds to a single reflective surface so that the ratio of LEDs to reflective surfaces is 1 to 1, wherein each LED is disposed to emit light to a direction substantially perpendicular to a longitudinal bisector of the light guide plate toward each facing reflective surface and none of the LEDs are disposed to emit light to a direction substantially parallel to the longitudinal bisector of the light guide plate, wherein a bisector of the first reflective structure matches the longitudinal bisector of the light guide plate, and light emitted from each of the LEDs is reflected by the corresponding reflective surface to be incident on the light guide plate in a form of line-shaped light, wherein the backlight assembly comprises at least four combinations of an LED and a corresponding reflective surface and the combinations are disposed substantially symmetrically about the longitudinal bisector of the light guide plate, and wherein all of the LEDs are arranged along a common line that extends along a side of the light guide plate, and that common line is substantially perpendicular to the longitudinal bisector of the light guide plate. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A backlight assembly having a plurality of light emitting diodes (LEDs) and a light guide plate for uniformly guiding light emitted from the LEDs to a liquid crystal substrate, the backlight assembly comprising:
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at least two sets each consisting of an LED and a reflective structure having a reflective surface facing the LED and tilted at a constant angle, at least one set being symmetrically disposed at each of opposite sides of a longitudinal bisector of the light guide plate, wherein the reflective structure of a first set is independently disposed and spaced a distance from the reflective structure of a second set wherein each LED is disposed to emit light to a direction substantially perpendicular to the longitudinal bisector of the light guide plate toward each facing reflective surface and none of the LEDs are disposed to emit light to a direction substantially parallel to the longitudinal bisector of the light guide plate, wherein each LED corresponds to a single reflective surface such that the ratio of LEDs to reflective surfaces is 1 to 1, wherein the light emitted from each of the LEDs is reflected by the corresponding reflective surface to be incident on the light guide plate in a form of line-shaped light, wherein the backlight assembly includes at least four combinations of an LED and a corresponding reflective surface and the combinations are disposed substantially symmetrically about the longitudinal bisector of the light guide plate, and wherein all of the LEDs are arranged along a common line that extends along a side of the light guide plate, and that common line is substantially perpendicular to the longitudinal bisector of the light guide plate. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification