Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
October 25, 2011
Patent Application Number
12521241
Date Filed
July 23, 2007
Patent Citations Received
...
Patent Primary Examiner
Patent abstract
A backlight device capable of preventing or reducing, even when an optical sheet bends, occurrence of luminance nonuniformity and/or shades due to the bend. The backlight device 1 controls the properties of light emitted by a light source 12 using two upper and lower diffusion sheets 16, 20 and a lens sheet 18 placed between the diffusion sheets and illuminates the back side of a display panel with the light, in which a space 24 for expansion is provided between the lens sheet 18 and the upper diffusion sheet 20, the space for expansion accommodating a bend of the lens sheet 18 which is caused by expansion due to heat from the light source 12.
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