Surface-area light source and LCD device having light guide plate with a side surface having a staircase shape in which a plurality of light emitting devices are fixed to respective steps thereof
First Claim
1. A surface-area light source device, comprising:
- a light guide plate arranged to receive light through a side surface thereof and to output the light from a top surface thereof; and
a plurality of light emitting devices arranged to emit light that enters the light guide plate through a side surface of the light guide plate;
whereinat least one side surfaces of the light guide plate through which light from the light emitting devices enters the light guide plate has a staircase shape, including steps in a direction that is substantially perpendicular to a long side of a side surface of the light guide plate; and
the light emitting devices are fixed to a corresponding surface of the steps.
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Accused Products
Abstract
In a surface-area light source device, a light entrance side surface of a light guide plate of a surface-area light source device has a staircase shape having steps in the vertical direction, and light emission diodes are provided at each step. The structure enables the distance between a light emission diode provided at one step and light emission diodes provided at an adjacent step to be maintained greater even if the thickness of the light guide plate is reduced so as to decrease intervals of the light emission diodes in the direction of the thickness of the light guide plate. As a consequence, the amount of transmission and reception of heat produced by the light emission diodes is reduced to prevent an increase in the temperature of the diodes. This allows a reduction in the thickness of the light guide plate with the brightness of light emitted from the light guide plate maintained, enabling the surface-area light source device to be thinned. As a result, a large number of light emitting diodes are provided, so that the brightness of the surface light source device is increased.
10 Citations
15 Claims
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1. A surface-area light source device, comprising:
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a light guide plate arranged to receive light through a side surface thereof and to output the light from a top surface thereof; and a plurality of light emitting devices arranged to emit light that enters the light guide plate through a side surface of the light guide plate;
whereinat least one side surfaces of the light guide plate through which light from the light emitting devices enters the light guide plate has a staircase shape, including steps in a direction that is substantially perpendicular to a long side of a side surface of the light guide plate; and the light emitting devices are fixed to a corresponding surface of the steps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification