| 摘要 |
A flat panel display is provided. The flat panel includes at least one light emitting device having a light emitting semiconductor device and a lens. The lens includes two reflective surfaces which are disposed at both sides with respect to a central axis of the lens. Refractive surfaces connect with the respective reflective surfaces and have a tilt included angle with respect to the central axis. Each of the refractive surfaces continuously extends from the reflective surface along a direction toward the central axis. A Fresnel surface is configured between the refractive surfaces. Light rays emitted from the light emitting semiconductor device reach the lens. A portion of the light rays reaching each of the reflective surfaces is reflected to at least one of the refractive surfaces and the Fresnel surface. The reflected light rays are refracted and collected with a convergent angle.
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