Liquid crystal display device having a light guide plate being formed in a trapezoidal shape in cross section
First Claim
Patent Images
1. A liquid crystal display device comprising:
- a liquid crystal panel; and
a backlight which radiates light to the liquid crystal panel, whereinthe backlight includes a plurality of light emitting elements and a light guide plate including a back-surface and a top-surface,light emitting elements are aligned along a light incident side surface of the light guide plate,two opposite side edge portions of the light guide plate extend in a direction perpendicular to the light incident side surface and are tapered such that a width of the light guide plate extending between the two opposite side edge portions is increased from the back-surface to the top-surface,a width of the top-surface of the light plate extending between the two opposite side edge portions is larger than a width of the back-surface of the light guide plate extending between the two opposite side edge portions;
an ejector pin mark is formed on a back-surface side of the light guide plate in the vicinity of at least one of the two opposite side edge portions and has a concave shape, andwherein a fixing projection is formed on the at least one of the two opposite side edge portions of a top-surface side of the light guide plate in the vicinity of the ejector pin mark.
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Accused Products
Abstract
A backlight which arranges light emitting diodes on a side surface of light guide plate adopts the structure which allows the easy removal of the light guide plate from a mold and makes it difficult for a stress or the like to influence the fine structure of a light incident portion of the light guide plate. In a liquid crystal display device having a backlight which radiates light to a liquid crystal panel, LEDs which constitute a light emitting element are mounted on a light guide plate which is mounted on a backlight, and edge portions of the light guide plate are tapered such that a width of the light guide plate is increased in the removal direction of the side surface of the light guide plate. Further, an ejector-pin mark is formed on a lower surface of the light guide plate by pushing an ejector pin in the removal direction of the light guide plate.
6 Citations
13 Claims
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1. A liquid crystal display device comprising:
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a liquid crystal panel; and a backlight which radiates light to the liquid crystal panel, wherein the backlight includes a plurality of light emitting elements and a light guide plate including a back-surface and a top-surface, light emitting elements are aligned along a light incident side surface of the light guide plate, two opposite side edge portions of the light guide plate extend in a direction perpendicular to the light incident side surface and are tapered such that a width of the light guide plate extending between the two opposite side edge portions is increased from the back-surface to the top-surface, a width of the top-surface of the light plate extending between the two opposite side edge portions is larger than a width of the back-surface of the light guide plate extending between the two opposite side edge portions; an ejector pin mark is formed on a back-surface side of the light guide plate in the vicinity of at least one of the two opposite side edge portions and has a concave shape, and wherein a fixing projection is formed on the at least one of the two opposite side edge portions of a top-surface side of the light guide plate in the vicinity of the ejector pin mark. - View Dependent Claims (2, 8, 11)
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3. A liquid crystal display device comprising:
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a liquid crystal panel; and a backlight which radiates light to the liquid crystal panel, wherein the backlight includes a light guide plate and a plurality of light emitting diodes arranged along a light incident side surface of the light guide plate, the light guide plate is formed by injection molding and includes a back-surface and a top-surface, two opposite side edge portions of the light guide plate extend in a direction perpendicular to the light incident side surface and are tapered such that a width of the light guide plate extending between the two opposite side edge portions is increased from the back-surface to the top-surface, a width of the top-surface of the light guide plate extending between the two opposite side edge portions is larger than a width of the back-surface of the light guide plate extending between the two opposite side edge portions, an ejector pin mark is formed on the light guide plate on a back-surface side in the vicinity of at least one of the two opposite side edge portions and has a concave shape, and a fixing projection is formed on the at least one of the two opposite side edge portions of a top-surface side of the light guide plate in the vicinity of the ejector pin mark. - View Dependent Claims (4, 5, 9, 12)
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6. A liquid crystal display device comprising:
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a liquid crystal panel; and a planar lighting device which radiates light to the liquid crystal panel, wherein the planar lighting device includes a light guide plate having a light radiation surface, a bottom surface which faces the light radiation surface in an opposed manner and side surface, a side surface of the light guide plate has an incident side surface on which a plurality of LEDs are mounted and through which light from the LEDs is incident on the light guide plate, a scattering member is provided on the bottom surface of the light guide plate for allowing light incident on the light guide plate to be directed toward a light-radiation-surface side, and to be radiated from the light radiation surface, two opposite side edge portions of the light guide plate extend in a direction perpendicular to the incident side surface and are tapered such that a width of the light guide plate extending between the two opposite side edge portions is increased from the bottom surface to the light-radiation-surface, a width of the light radiation surface of the light guide plate extending between the two opposite side edge portions is larger than a width of the bottom surface of the light guide plate extending between the two opposite side edge portions, an ejector pin mark is formed on the light guide plate on a bottom surface side of the light guide plate in the vicinity of at least one of the at least two opposite side edge portions and has a concave shape, and a fixing projection is formed on the at least one of the at least two opposite side edge portions on the light-radiation-surface side of the light guide plate in the vicinity of the ejector pin mark. - View Dependent Claims (7, 10, 13)
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Specification
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Current AssigneePanasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
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Original AssigneeHitachi Display Devices Limited (Hitachi, Ltd.), Hitachi Displays Limited (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
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InventorsMifune, Masayuki
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Primary Examiner(s)Nguyen, Lauren
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Application NumberUS12/370,900Publication NumberTime in Patent Office1,495 DaysField of Search349/65, 349/62, 349/64, 362/97.1, 362/97.2, 362/561, 362/608, 362/615US Class Current349/65CPC Class CodesG02B 6/0038 Linear indentations or groo...G02B 6/0046 Tapered light guide, e.g. w...G02B 6/0065 Manufacturing aspects; Mate...G02B 6/0088 of the light guide or other...
