| 摘要 |
A filter device is mounted in a backlight device for illuminating a transmission type liquid crystal display panel from the rear surface side. The filter device includes a sheet having a polygonal filter portion for imparting predetermined optical characteristics to rays of light emerging from the light exit surface of a light guide and a holding portion extending from one side of the filter portion, a frame member having a polygonal opening portion in correspondence with the filter portion to allow light transmitted through the filter portion of the sheet to pass through, and a double-coated tape for bonding the holding portion of the sheet to the frame member.
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