Backlight unit and liquid crystal display device using the same
First Claim
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1. A backlight unit comprising:
- a light guide having an upper surface, a lower surface, and side end surfaces between the upper and lower surfaces, the lower surface having a recessed portion formed therein from which light enters the light guide, the light guide mixing the entering light and emitting illuminating light from the upper surface; and
a plurality of light-emitting elements of a side-emitting type arranged and mounted on an array substrate, the plurality of light-emitting elements of the side-emitting type being placed in the recessed portion of the light guide.
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Abstract
Light emitted in side surface directions from side-emitting red, green, and blue LEDs which are arranged on an LED array substrate is introduced into a light guide from side surfaces of a groove-shaped recessed portion, and propagates in the light guide. Thus, the three colors are mixed. The light further propagates in the light guide while being reflected at both side end surfaces of the light guide by the function of a reflective sheet and the like. Thus, color mixing progresses. Further, the light is reflected upward by diffuse reflective means provided on the lower surface of the light guide, and emitted as backlight light to the outside through a diffuse sheet.
225 Citations
11 Claims
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1. A backlight unit comprising:
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a light guide having an upper surface, a lower surface, and side end surfaces between the upper and lower surfaces, the lower surface having a recessed portion formed therein from which light enters the light guide, the light guide mixing the entering light and emitting illuminating light from the upper surface; and
a plurality of light-emitting elements of a side-emitting type arranged and mounted on an array substrate, the plurality of light-emitting elements of the side-emitting type being placed in the recessed portion of the light guide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A liquid crystal display device comprising:
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a backlight unit including a light guide and a plurality of light-emitting elements of a side-emitting type;
the light guide having an upper surface, a lower surface, and side end surfaces between the upper and lower surfaces, the lower surface having a recessed portion formed therein from which light enters the light guide, the light guide mixing the entering light and emitting illuminating light from the upper surface;
the plurality of light-emitting elements of the side-emitting type being arranged and mounted on an array substrate and being placed in the recessed portion of the light guide;
a liquid crystal panel receiving illuminating light of the backlight unit; and
a frame holding the backlight unit and the liquid crystal panel. - View Dependent Claims (10, 11)
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Specification
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Current AssigneeNEC LCD Technologies Limited (NEC Corporation)
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Original AssigneeNEC LCD Technologies Limited (NEC Corporation)
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InventorsBaba, Masatake
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Application NumberUS11/170,443Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current362/613CPC Class CodesG02B 6/0021 for housing at least a part...G02B 6/0055 Reflecting element, sheet o...G02B 6/0068 Arrangements of plural sour...G02B 6/0073 Light emitting diode [LED]G02F 1/133603 with LEDsG02F 1/133609 including means for improvi...G02F 1/133611 including means for improvi...
