Liquid crystal display device
AssigneeHitachi Displays, Ltd.
InventorsHiroshi Nakamoto, Yoshikazu Tanabe, Ken Kagabu
Life of this patent
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Abstract
In a method of forming a thin light guide plate which includes a compression step in an injection molding step, an optical pattern is liable to be adhered to a mold. Further, in removing the light guide plate from the mold using an ejector pin, a stress is concentrated on a local area of the light guide plate thus generating warping, deformation or irregularities in size of the light guide plate. To overcome such drawbacks, a liquid crystal display device is configured such that an optical pattern portion is compressed, and the light guide plate is removed by making use of a peripheral portion of a mold thus preventing the generation of stress in a local area of the light guide plate due to an ejector pin.
Claims12
A liquid crystal display device comprising:
- a liquid crystal panel;
- and
- a backlight which radiates light to the liquid crystal panel, wherein
- the backlight includes a light emitting element and a light guide plate on which light emitted from the light emitting element is incident,
- the light guide plate includes a light incident portion which faces a light emitting surface of the light emitting element in an opposed manner and on which the light emitted from the light emitting element is incident, and a light radiating portion which radiates the incident light,
- the light incident portion is formed by compressing a resin, and
- the light guide plate includes a stepped portion which is formed by compression.
A liquid crystal display device comprising:
- 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 which is arranged along a side surface of the light guide plate,
- the light guide plate includes a light incident surface on which lenses on which light emitted from the light emitting diodes is incident are mounted, projecting portions which project from the side surface of the light guide plate with said each lens sandwiched therebetween, and a light radiating portion which has a thickness smaller than a length of the light emitting diodes,
- the light radiating portion includes a light radiating surface,
- a light incident portion is formed by forming the light incident surface and the projecting portions by injection molding,
- the light incident portion is formed by compressing a resin, and
- the light guide plate includes a stepped portion formed by compression.
A liquid crystal display device comprising;
- 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 and LEDs,
- the light guide plate includes a light radiating surface, a bottom surface which faces the light radiating surface in an opposed manner, and a side surface which intersects the light radiating surface and the bottom surface,
- the LEDs are arranged along a side surface of the light guide plate,
- light emitted from the LEDs is incident on the light guide plate from the side surface of the light guide plate, and
- the light which is incident on the light guide plate is directed toward a light-radiating-surface-side by a diffusion member which is mounted on the bottom surface of the light guide plate and is radiated from the light radiating surface,
- a thickness of the LED is set larger than a distance between the light radiating surface and the bottom surface,
- the light guide plate includes an inclined portion between the side surface on which light is incident and the light radiating surface,
- the inclined portion is formed by compressing a resin, and
- the light guide plate includes a stepped portion which is formed by compression.
Dependencies are inferred from the claim text.