LED element having elongated LED and direct-type backlight module using the same

摘要

An LED element includes an LED and a lens located over the LED. The LED has a rectangular light outputting face. The lens has a light outputting face. The light outputting face of the lens includes a first light outputting portion and two second light outputting portions. The first light outputting portion performs a convergent function to light output along a long side of the rectangular light outputting face of the LED. The second light outputting portion performs a divergent function to the light output along a short side of the rectangular light outputting face of the LED. The light emitted from the lens has an energy intensity distribution the same along each of two perpendicular directions of the long side and short side of the rectangular light outputting face.

主权项

1. An LED element comprising:
an elongated LED having a rectangular light outputting face; and a lens located above the LED and having a light inputting face and a light outputting face, and the light outputting face of the lens being protruded upwardly from a periphery toward a center thereof and comprising a first light outputting portion and two second light outputting portions located at two opposite sides of the first light outputting portion, respectively, a generally M-shaped boundary being defined between the first light outputting portion and each second light outputting portion; wherein the first light outputting portion is a curved face which protrudes outwardly and upwardly away from the LED, each second light outputting portion is a curved face which has an edge at the boundary which is below an edge of the first light outputting portion at the boundary whereby a wall is defined between the two edges, the first light outputting portion converges light output along a long side of the rectangular light outputting face of the LED, the second light outputting portion diverges light output along a short side of the rectangular light outputting face of the LED, after the light emitted from the LED transmits through the lens, an energy intensity distribution along a direction of the long side of the rectangular light outputting face of the LED being the same as an energy intensity distribution along a direction of the short side of the rectangular light outputting face of the LED; wherein after the light emitted from the elongated LED transmits through the lens, a circular symmetric luminous distribution is formed.