Backlight unit for a liquid crystal display including a reflection member receiving chassis
View Patent ↗A backlight unit for use in an LCD unit includes an optical guide plate, a tubular lamp extending along the lateral side of the optical guide plate, a reflection member including a reflector encircling the tubular lamp at three sides thereof and a reflection sheet disposed at the rear side of the optical guide plate, a chassis receiving therein the optical guide plate and the reflection member, and a lamp holder disposed at the corner portion of the chassis. The reflector has an extension at the corner portion, the extension being sandwiched between the chassis and the lamp holder to restrict the lateral movement of the reflector.
1. A backlight unit comprising:
an optical guide plate having a front irradiation surface;
a tubular lamp extending along a lateral side of said optical guide plate;
a reflection member including a reflector for encircling said tubular lamp except for said lateral side of said optical guide plate and a reflection sheet disposed at a rear side of said optical guide plate;
a chassis for receiving therein said reflection member and said optical guide plate for support of said reflection member and said optical guide plate in unison; and
a lamp holder for supporting said tubular lamp at a corner portion of said chassis, wherein:
said reflector has a first portion sandwiched between said chassis and said lamp holder, said first portion restricting a lateral movement of at least a front edge of said reflector with respect to said chassis.
2. The backlight unit according to claim 1 , wherein said front edge of said reflector and said optical guide plate are adhered together by an adhesive tape.
3. An LCD unit comprising said backlight unit according to claim 1 , and an LCD panel receiving light from said irradiating surface.
4. The backlight unit according to claim 1 , wherein said engagement engages with a lateral side of said chassis.
5. The backlight unit according to claim 1 , wherein said reflector is separated at a corner portion of said chassis, and said first portion extends from an end of said reflector at said corner portion.
6. The backlight unit according to claim 5 , wherein said first portion has an engagement which engages with a lateral side of said chassis.
7. The backlight unit according to claim 1 , wherein said lamp holder has a horseshoe cross section as viewed normal to an extending direction of said tubular lamp, said horseshoe cross section having an opening at said lateral side of said optical guide plate.
8. The backlight unit according to claim 7 , wherein said horseshoe cross section is adapted to a cross section of said reflector.
9. The backlight unit according to claim 7 , wherein said reflector has a cutout for exposing a portion of said chassis, whereby said lamp holder is supported by said chassis at said exposed portion thereof.
10. A backlight unit comprising:
an optical guide plate having a front irradiation surface;
a tubular lamp extending along a lateral side of said optical guide plate;
a reflection member including a reflector for encircling said tubular lamp except for said lateral side of said optical guide plate and a reflection sheet disposed at a rear side of said optical guide plate;
a chassis for receiving therein said reflection member and said optical guide plate for support of said reflection member and said optical guide plate in unison; and
a lamp holder for supporting said tubular lamp at a corner portion of said chassis, wherein:
said reflector has an engagement at a front side thereof, said engagement engaging with said chassis to restrict a lateral movement of at least a front edge of said reflector with respect to said chassis.
11. An LCD unit comprising said backlight unit according to claim 10 , and an LCD panel receiving light from said irradiating surface.