Patent ID: 8070345

Claim:
A light guide plate, comprising: a body having a bottom surface having a center and a light output surface; a reflector located on the light output surface and opposite to the center, the reflector is a cavity; and a plurality of scattering dots located on the bottom surface, the scattering dots are arranged in the form of a plurality of concentric circles around the center, and the number of the scattering dots is defined based on a radius of the circle, the radius of the circle is greater than or substantially equal to 4 millimeter, wherein the number of the scattering dots for each concentric circle â€˜eâ€™ is definded by the following formula: e=| 4 [a 1Ã—( râˆ’a 2)Ã—( râˆ’a 3)]| where â€˜râ€™ is a radius of the circle and râ‰§4 millimeter; â€˜a 1 â€™, â€˜a 2 â€™ and â€˜a'â€™ are constant, 0.05â‰¦a 1 â‰¦0.1, a 2 â‰§6, and a 3 â‰¦12.