Industrial Technology Research Institute

Epistar Corporation

Jim-Yong Chi

Wen-Yung Yeh

Jih-Fu Wang

Ming-Te Lin

Hsi-Hsuan Yen

Sheng-Pan Huang

Jenq-Dar Tsay

Chiu-Ling Chen

Jung-Tsung Hsu

Jung-Chieh Su

Chang-Cheng Chuo

I-Min Chan

Jun-Ren Lo

Ting-Chi Lee

An alternating current (AC) light emitting assembly and an AC light emitting device are disclosed. The AC light emitting assembly includes a substrate; a rectifier unit comprising a plurality of rectifier components arranged in a Wheatstone Bridge, for rectifying an AC signal into a direct current (DC) signal, each of the rectifier components having a high breakdown voltage and a low forward voltage; a light emitting unit electrically connected to the rectifier unit and comprising a plurality of light emitting components formed on the substrate, for emitting light when receiving the DC signal outputted by the rectifier unit; and two conductive electrodes electrically connected to the rectifier unit for receiving and transmitting the AC signal to the rectifier unit. The AC light emitting device includes two stacked and electrically connected AC light emitting assemblies.

AC light emitting assembly and AC light emitting device

The EM polarizing structure contains a two dimensional planar variation structure, having medium nodes regularly distributed as a two dimensional planar photonic unit lattice cell array on a plane. Each of the photonic unit lattice cells has an operation axis and is identical at each lattice point, which passes a diagonal of photonic unit lattice cell. The medium nodes within each planar photonic unit lattice cell are distributed asymmetrical with respect to the operation axis direction and identical at each lattice point. The EM polarizing structure is used to modulate an input EM wave around an operation frequency of the photonic band associated with the EM wave polarizing structure. Thus a corresponding output EM wave becomes polarized. Moreover, the EM wave polarizing structure can be integrated with an EM wave emitting source. Thus an output EM wave from the device is polarized.

Electromagnetic (EM) wave polarizing structure and method for providing polarized electromagnetic (EM) wave

A light emitting apparatus at least includes a light emitting device, a connecting wire structure, and a space-occupation body. The light emitting device is disposed in the space-occupation body, electrically coupled with the connecting wire structure, and emits a first-frequency-range light under a suitable driving voltage. A light emitting surface of the light emitting device structure is covered by a first anti-reflection layer with respect to the first-frequency-range light. A packaging material is filled into the space-occupation body. The packaging material at least includes a luminescent material. The luminescent material is excited by the first-frequency-range light, so as to generate at least a second-frequency-range light. A reflector is disposed on the light emitting surface of the light emitting apparatus, such that the first-frequency-range light is totally or mostly reflected back to the space-occupation body omni-directionally, and the excited second-frequency-range light passes through the reflector.

Phosphor-based LED apparatus with UV reflector

A light emitting diode (LED). The LED comprises a LED chip comprising an n-type semiconductor layer, a active layer and a p-type semiconductor layer. An n-type ohmic contact electrode and a p-type ohmic contact electrode electrically contact the n-type semiconductor layer and the p-type semiconductor layer respectively. An AlGaInN thick film is on the LED chip, and the AlGaInN thick film has an oblique side and a textured top surface.

Light emitting diode and fabrication method thereof

A white-light LED with omni-directional reflectors includes an LED chip for emitting white-light. A light transmitting material surrounding the LED and phosphor grains is dispersed in order to excite fluorescence via emission of LED. Two omni-directional reflectors are implemented on the top and/or bottom of the LED symmetrically surrounding the light transmitting material and the LED chip. The light from the LED was reflected omni-directionally, via the dielectric omni-directional reflectors, to increasing the efficiency and/or spectral characteristics and uniformity of the visible light emission.

White-light led with dielectric omni-directional reflectors

Growing community of inventors

Taichung, Taiwan

Jim-Yong Chi