摘要:
A packaged light emitting device includes a substrate, a solid state light emitting device on the substrate, a first generally toroidal lens on the substrate and defining a cavity relative to the solid state light emitting device and having a first index of refraction, and a second lens at least partially within the cavity formed by the first lens and having a second index of refraction that is different from the first index of refraction. The second index of refraction may be higher than the first index of refraction. The lenses may be mounted on the substrate and/or may formed by dispensing and curing liquid encapsulant materials.
摘要:
A lighting system may include a substrate and a light emitting device (LED) on the substrate, and the light emitting device may be configured to transmit light having a first wavelength along a path away from the substrate. A remote reflector may be spaced apart from the light emitting device, and the light emitting device may be between the substrate and the remote reflector. The remote reflector may also be in the path of the light having the first wavelength transmitted by light emitting device. A luminescent layer may be on a surface of the remote reflector, and the luminescent layer may be configured to convert a portion of the light having the first wavelength to light having a second wavelength different than the first wavelength. Moreover, the remote reflector may be configured to reflect light having the first and second wavelengths.
摘要:
A modular package for a light emitting device includes a leadframe having a top surface and including a central region having a bottom surface and having a first thickness between the top surface of the leadframe and the bottom surface of the central region. The leadframe may further include an electrical lead extending away from the central region. The electrical lead has a bottom surface and has a second thickness from the top surface of the leadframe to the bottom surface of the electrical lead. The second thickness may be less than the first thickness. The package further includes a package body on the leadframe surrounding the central region and exposing the bottom surface of the central region. The package body may be at least partially provided beneath the bottom surface of the lead and adjacent the bottom surface of the central region. Methods of forming modular packages and leadframes are also disclosed.
摘要:
A light emitting diode (LED) lighting fixture for achieving a desired illumination pattern includes a panel and one or more LEDs attached to a surface of the panel. One or more of the LEDs may be mounted at an angle to the surface.
摘要:
A double flip-chip semiconductor device formed by a double flip fabrication process. Epitaxial layers are grown on a substrate in the normal fashion with the n-type layers grown first and the p-type layers grown subsequently. The chip is flipped a first time and mounted to a sacrificial layer. The original substrate is removed, exposing the n-type layer, and various additional layers and treatments are added to the device. Because the n-type layer is exposed during fabrication, the layer may be processed in various ways including adding a reflective element, texturing the surface or adding microstructures to the layer to improve light extraction. The chip is flipped a second time and mounted to a support element. The sacrificial layer is then removed and additional layers and treatment are added to the device. The finished device features a configuration in which the layers maintain the same orientation with respect to the support element that they had with the original substrate on which they were grown. Processing the n-type layers, rather than the p-type layers as in a single flip process, provides greater design flexibility when selecting features to add to the device. Thus, previously unavailable processes and reflective elements may be utilized, enhancing the external quantum efficiency of the device.
摘要:
Methods of packaging a semiconductor light emitting device include providing a substrate having the semiconductor light emitting device on a front face thereof and a contact on a front face thereof, wherein the light emitting device is electrically connected to the contact on the front face of the substrate. The substrate is compression molded to form an optical element on the front face of the substrate over the semiconductor light emitting device and a residual coating over a region of the front face of the substrate including the contact. The residual coating over the contact may be removed without damaging the contact. Packaged semiconductor light emitting devices are also provided.
摘要:
Method of forming a plastic element include dispensing a quantity of a liquid precursor material into a first die mold, positioning a carrier tape on the first die mold above the dispensed liquid precursor material, bringing a second die mold into contact with the carrier tape and the first die mold, and applying pressure to the first die mold and the second die mold. The liquid precursor material may include a liquid silicone.
摘要:
A circuit for detecting user contact of one of a plurality of touch pads includes a plurality of drive lines and a plurality of sense lines coupled with the touch pads. A sense circuit responsive to the signals on the sense lines produces a pulse having a width that is proportional to the amplitude of each of the sense signals. A control circuit measures the width of the pulses produced by the sense circuit and compares each measured pulse width to a reference pulse width to distinguish between a touch and no-touch condition for each touch pad. The sense circuit is illustrated in the form of a comparator having a threshold input that is always exceeded by the sense signal to produce the variable width pulse. Separate amplifiers may be provided for each sense line.
摘要:
Methods of packaging semiconductor light emitting devices include providing a substrate having the semiconductor light emitting device on a front face thereof. A first optical element is formed from a first material on the front face proximate the semiconductor light emitting device. A second optical element is formed from a second material, different from the first material, over the semiconductor light emitting device and the first optical element. The first optical element and/or the second optical element are formed by compression molding the respective optical element.
摘要:
Semiconductor light emitting device packaging methods include fabricating a substrate configured to mount a semiconductor light emitting device thereon. The substrate may include a cavity configured to mount the semiconductor light emitting device therein. The semiconductor light emitting device is mounted on the substrate and electrically connected to a contact portion of the substrate. The substrate is liquid injection molded to form an optical element bonded to the substrate over the semiconductor light emitting device. Liquid injection molding may be preceded by applying a soft resin on the electrically connected semiconductor light emitting device in the cavity. Semiconductor light emitting device substrate strips are also provided.