Plane-shaped lighting device and a display using such a device
First Claim
1. A display device comprising:
- a plane-shaped lighting device having a light source and a light-directing plate that has light-takeoff bodies installed on a plane section thereof;
a patterned display board that is placed on a first side of the plane section of the plane-shaped lighting device; and
a reflection plate that is placed on a second side, opposite the first side, of the plane section,wherein;
the patterned display board has light-transmitted sections for allowing light to pass therethrough and light-shielding sections for preventing light from passing therethrough; and
each of the light-shielding sections has a first side face that forms a reflective surface, the first side face being opposite to the light-directing plate, and a second side face that forms a scattering surface with a low reflectivity with respect to visible light rays, the second side face being opposite the first side face.
1 Assignment
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Accused Products
Abstract
A plane-shaped lighting device has a light-directing plate and a light source that is placed in contact with or in the proximity of the light-incident surface of the light-directing plate, and the light source is constituted of a plurality of LED lamps each of which has an LED chip for emitting light and a semispherical lens for directing the light from the LED chip into the light-directing plate. Here, the distance from the LED chip to the top of the semispherical lens is set to be 1.8 times as long as the radius of curvature of the semispherical lens. This arrangement allows the light emitted from the LED chip to be efficiently incident on the light-incident surface of the light-directing plate, thereby improving the light-incidence efficiency to the light-directing plate. Further, the application of this plane-shaped lighting device to display devices makes it possible to improve the efficiency of light utilization, and consequently to provide thinner display devices with high visibility.
218 Citations
24 Claims
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1. A display device comprising:
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a plane-shaped lighting device having a light source and a light-directing plate that has light-takeoff bodies installed on a plane section thereof; a patterned display board that is placed on a first side of the plane section of the plane-shaped lighting device; and a reflection plate that is placed on a second side, opposite the first side, of the plane section, wherein;
the patterned display board has light-transmitted sections for allowing light to pass therethrough and light-shielding sections for preventing light from passing therethrough; and
each of the light-shielding sections has a first side face that forms a reflective surface, the first side face being opposite to the light-directing plate, and a second side face that forms a scattering surface with a low reflectivity with respect to visible light rays, the second side face being opposite the first side face. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A display device comprising:
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a plane-shaped lighting device having a light source which emits light rays at a plurality of colors and a light-directing plate that has light-takeoff bodies installed on a plane section thereof; a patterned display board that is placed on a first side of the plane section of the plane-shaped lighting device; and a reflection plate that is placed on a second side, opposite the first side, of the plane section, wherein;
the patterned display board has light-transmitting sections for allowing light to pass therethrough and light-shielding sections for preventing light from passing therethrough;
color filters, which selectively transmit light rays emitted from the light source based upon respective colors of light emission, are placed on the light-transmitting sections; and
each of the light-shielding sections has a first side face that forms a reflective surface, the first side face that forms a reflective surface, the first side face being opposite to the light-directing plate, and a second side face that forms a scattering surface with a low reflectivity with respect to visible light rays, the second side face being opposite the first side face. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification