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US 8,223,296 B2Granted
Backlight unit and liquid crystal display device having the same
AssigneeLG Display Co., Ltd.
InventorsSun Hwa Lee, Moon Sik Kang
Life of this patent
Estimating the term…
Abstract
A backlight unit for an LCD device produces a more uniform brightness by reducing or preventing bright lines occurring at the location of each LED device. The backlight unit includes a plurality of light guide plates which are arranged to overlap with an incident portion of adjacent light guide plate to at least partially cover the LED array. Accordingly, the backlight unit can prevent the generation of bright lines and hot spots caused when the light guide plate does not cover the LED array. As a result, the LCD device may improve images of uniform brightness.
Claims23
A backlight unit comprising:
- a bottom cover that defines a plurality of luminescent regions in first and second directions substantially perpendicular to each other;
- a plurality of light guide plates disposed in the luminescent regions;
- a LED array including a substrate having a flat surface parallel to the bottom cover and a plurality of LEDs on a first region of the substrate at the side surfaces of the light guide plates along the first direction;
- and
- an optical sheet disposed over the light guide plates and the LED array,
- wherein a second light guide plate of adjacent light guide plates in the second direction overlaps an incident portion of a first light guide plate of the adjacent light guide plates to substantially cover the LEDs, and wherein the substrate is fixed under incident portion of the light guide plates along the first direction, wherein only a portion of the substrate other than the first region is fixed under the incident portion of the light guide plates, and
- wherein the two light guide plates adjacent to each other and the substrate are fastened to the bottom cover by a screw.
4 more elements
A liquid crystal display device comprising:
- a bottom cover defining a plurality of luminescent regions in first and second directions substantially perpendicular to each other;
- a plurality of light guide plates disposed in the luminescent regions;
- a LED array including a substrate having a flat surface parallel to the bottom cover and a plurality of LEDs on a first region of the substrate at the side surfaces of the light guide plates along the first direction;
- and
- an optical sheet disposed over the light guide plates and the LED array;
- and
- a liquid crystal panel disposed adjacent the optical sheet,
- wherein a second light guide plate of adjacent light guide plates in the second direction overlaps an incident portion of a first light guide plate of the adjacent light guide plates to substantially cover the LEDs, and wherein the substrate is fixed under incident portion of the light guide plates along the first direction, wherein only a portion of the substrate other than the first region is fixed under the incident portion of the light guide plates, and
- wherein the two light guide plates adjacent to each other and the substrate are fastened to the bottom cover by a screw.
6 more elements
A backlight unit comprising:
- a bottom cover defining a plurality of luminescent regions in first and second directions substantially perpendicular to each other;
- a plurality of light guide plates disposed in the luminescent regions;
- a LED array including a substrate having a flat surface parallel to the bottom cover and a plurality of LEDs on the substrate at the side surfaces of the light guide plates along the first direction;
- and
- an optical sheet disposed over the light guide plates and the LED array,
- wherein the light guide plates each comprises a protrusion portion, the protrusion portion of the light guide plate extending in a side direction from a top portion of an incident surface of the light guide plate adjacent to the LEDs to cover the LEDs, and wherein the substrate is fixed under the incident surface of the light guide plates along the first direction, and
- wherein the two light guide plates adjacent to each other and the substrate are fastened to the bottom cover by a screw.
4 more elements
Dependencies are inferred from the claim text.