PLANAR LIGHTING DEVICE AND DISPLAY DEVICE INCLUDING PLANAR LIGHTING DEVICE
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United States of America Patent
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Issued Date -
Jun 18, 2015
app pub date -
Jun 12, 2013
filing date -
Jun 13, 2012
priority date (Note) -
Abandoned
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Abstract
A planar lighting device includes a light-guide plate and a light source including a light-emitting surface that faces a first side surface. A center line passes through a center of the light-emitting surface and is perpendicular to the first side surface of the light-guide plate. The device also includes a first prism sheet including a prism arranged on a lower surface of the first prism sheet, the lower surface facing an upper surface of the light-guide plate, and a ridge line of the prism extending in parallel with the center line of the light-emitting surface of the light source, and a second prism sheet positioned over the first prism sheet and including a prism arranged on an upper surface of the second prism sheet, a ridge line of the prism of the second prism sheet extending substantially perpendicularly to the center line of the light-emitting surface of the light source.
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