Lumileds LLC

Lumileds Holding B.v.

Chunxia Feng

Erno Fancsali

Varun Dev Kakkar

Nicola Bettina Pfeffer

Arjen Gerben Van Der Sijde

Rob Jacques Paul Engelen

Emanuel Nicolaas Hermanus Johannes Stassar

Optical lens and light emitting device designs achieve uniform light distribution without producing a light 'hot spot', with a benefit of reducing the number of light sources needed and overall cost for direct-lit backlight device. The optical lens includes coating portions or structures on the bottom surface thereof, and a backlight device, or other light emitting device, incorporating said lens, to produce a uniform distribution of light at a target surface. The disclosed lens and light emitting device are particularly useful when an extremely wide transfer function of backlight is needed.

Illumination device with element having annular coating

A device includes a light-emitting device (LED) having at least two vertical light-emitting sides, and a ring-shaped light guide having a bottom side, a top side comprising a light-emitting surface, an inner sidewall, and an outer sidewall defining an indentation having at least two vertical in-coupling surfaces mated to the at least two vertical light-emitting sides of the LED.

Illumination device with light guide having angled light-accepting surfaces

Uniform, efficient, and color tunable ring flash for camera using LEDs with light emission from multiple sides

A light source includes a light-emitting diode or device (LED) and an optic mounted over the LED. The LED emits a first radiation pattern that is non-rotationally symmetric about a first axis. The optic collects the first radiation pattern and projects a second radiation pattern that is rotational symmetric about a second axis and has a peak intensity that is angled from the second axis.

Non-rotationally symmetric lens for non-rotationally symmetric light source resulting in rotationally symmetric beam pattern

Disclosed lens designs enable uniform light distribution without hot spot, achieving wider transfer functions of light compared with traditional lenses, with a benefit of reducing the number of light sources needed and overall cost for direct-lit backlight device. A disclosed lens includes a beam shaping element on the top thereof and a backlight device incorporating the lens and the beam shaping element to eliminate a light hot spot produced by the backlight device and obtain a uniform light distribution at the illumination field. The disclosed lens is especially useful when extremely wider transfer function or extremely thin backlight is needed.

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Shanghai, China

Chunxia Feng