BACKLIGHT DEVICE, LIQUID CRYSTAL DISPLAY APPARATUS, AND LIGHT DEFLECTING SHEET
First Claim
1. A backlight device comprising a light guide plate and at least one light source so that light is outputted outside from a light-outgoing plane of the light guide plate,wherein the light guide plate includes a hole or a projection formed on the light outgoing plane or the back plane opposing the light-outgoing plane, and a side face of the hole or the projection is directed roughly perpendicularly to the light-outgoing plane or the back plane.
1 Assignment
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Accused Products
Abstract
According to the present invention, by controlling the angular distribution of the light outputted from a light guide plate to enable the angular brightness distribution of the light emitted from a backlight device to be controlled, the thickness of a liquid crystal display apparatus having the backlight device is reduced as well as the brightness is improved due to the reduction in returned light amount. Furthermore, since light is sufficiently mixed in the light guide plate, light sources with comparative large unevenness are enabled to be used.
A backlight device according to the present invention includes a hole or a projection formed on the light outgoing plane of a light guide plate or the back plane opposing the light-outgoing plane, and a side face of the hole or the projection is directed roughly perpendicularly to the light-outgoing plane. Furthermore, specular reflection plates are arranged on the bottom plane and the side faces of the light guide plate. The angular distribution of light from a light source is maintained due to the roughly perpendicular side face of the hole or the projection so that the light is led within the light guide plate and outputted outside.
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Citations
23 Claims
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1. A backlight device comprising a light guide plate and at least one light source so that light is outputted outside from a light-outgoing plane of the light guide plate,
wherein the light guide plate includes a hole or a projection formed on the light outgoing plane or the back plane opposing the light-outgoing plane, and a side face of the hole or the projection is directed roughly perpendicularly to the light-outgoing plane or the back plane.
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19. A liquid crystal display apparatus comprising a transmission liquid crystal display panel and a backlight device for illuminating the liquid crystal display panel from the back side,
wherein the backlight device includes a light guide plate and a light source assembled in the light guide plate, and wherein the light guide plate is provided with a hole or a projection formed on a light-outgoing plane of the light guide plate or the back plane opposing the light-outgoing plane, and a side face of the hole or the projection is directed roughly perpendicularly to the light-outgoing plane or the back plane.
- 21. A light deflecting sheet arranged on a light outgoing plane of a light guide plate, the light deflecting sheet mixing light from a light source so as to derive the light outside and comprising pyramidal concave structures or concave structures with two triangular inclines and two trapezoidal inclines, the concave structures being juxtaposed at least on the light-outgoing plane.
Specification