Patent ID: 7658504
Filing Date: 2010-02-09
Classification: G02B,G02F

Abstract:
1. A backlight device comprising: a light emitting diode substrate with a plurality of light emitting diodes mounted on a front side thereof, the light emitting diode substrate being placed on a back side of a panel module having a rectangular shape, and having an image display surface on a front side thereof; and a reflection sheet for reflecting light emitted by said light emitting diodes to said panel module, being placed on the front side of said light emitting diode substrate and having a plurality of though-holes arranged with at least one of a distance therebetween in two orthogonal directions and in a staggered array, only a single light emitting diode being inserted in each of the plurality of through-holes, wherein gaps between said through-holes in a long-side direction of said panel module and the light emitting diodes inserted into said through-holes being larger than gaps between said through-holes in a short-side direction of said panel module and the light emitting diodes inserted into said through-holes, respectively, to prevent said only a single light emitting diode from making contact with a surface defining a through-hole due to a thermal expansion of said reflection sheet.