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AssigneeAu Optronics Corporation
InventorYi-Shiuan Chiou
Estimating the term…
A light guide plate capable of controlling light-emitting angle. The light guide plate includes a plurality of recesses or protrusions, each recess or protrusion including a main axis, a circular plane perpendicular to the main axis, an arc lateral plane formed by an arc from a first included angle to a second included angle in respect to the main axis at a predetermined radius surrounding the main axis, wherein an edge of the arc lateral plane is connected to an edge of the circular plane, and a reflective film formed over the circular plane and the arc lateral plane. The light-emitting angle of the light guide plate is regulated by the first and second included angles, thereby increasing view angle of a liquid crystal display device.
A light guide plate capable of controlling light-emitting angle, comprising:
A light guide plate capable of controlling light-emitting angle, comprising:
A liquid crystal display device, comprising:
A liquid crystal display device, comprising:
Dependencies are inferred from the claim text.
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Backward citations are indexed for grants only.
Provided on the surface of the light guide or in the bulk of it: 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
Illuminating devices: edge-illuminating devices, i.e. illuminating from the side
Provided by one optical element, or plurality thereof, placed on the light output side of the light guide: reflecting element, sheet or layer
Optical elements, systems or apparatus
Term end not estimated
1. Field of the Invention
The invention relates to a light guide plate capable of controlling light-emitting angle, particularly to utilization of the light guide plate capable of controlling light-emitting angle for a liquid crystal display (LCD) to increase viewing angle of the LCD.
2. Description of the Related Art
The aforementioned objects, features and advantages of this invention will become apparent by referring to the following detailed description of a preferred embodiment with reference to the accompanying drawings, wherein:
FIG. 1 is a schematic diagram of a typical liquid crystal display device;
FIG. 2 is a schematic cross-section of a light guide plate capable of controlling light-emitting angle according to a first embodiment of the invention;
[First Embodiment]
FIG. 2 is a schematic cross-section of a light guide plate capable of controlling light-emitting angle according to a first embodiment of the invention. In FIG. 2, the light guide plate capable of controlling light-emitting angle 10 has a light-emitting plane 11 and a light-reflecting plane 12. Additionally, a lamp is disposed near to an end 13 of the light guide plate 10. The invention is characterized by formation of a plurality of reflective patterns 14 on the light reflection plane 12.
As shown in FIG. 2, a plurality of reflective patterns 14 are a plurality of recesses. Each recess includes a main axis 141 and a circular plane 142 perpendicular to the main axis 141. Additionally, an arc from a first included angle al to a second included angle α2 in respect to the main axis 141 at a predetermined radius R is formed and an arc lateral plane 143 is formed by the arc around the main axis 141. An edge of the arc lateral plane 143 at the first included angle α1 is also connected to an edge of the circular plane 142. Further, a reflective film 144 on each recess plane is formed over the planes 142, 143 to reflect light in a respective recess.