Abstract: A system and method for generating white light involves using a combination of phosphor-converted white LEDs and non-phosphor-converted color LEDs to produce white light and adjusting the emitted light in response to feedback signals. Generating white light using a combination of phosphor-converted white LEDs and non-phosphor-converted color LEDs produces white light with an improved CRI and a wide SPD. Adjusting the emitted light in response to feedback allows luminance and chrominance characteristics of the white light to be controlled as the performance of the LEDs changes over time. The emitted light can be adjusted on a per-color basis and/or on a per-group basis, where a group of LEDs includes a combination of at least one phosphor-converted white LED and at least one non-phosphor-converted color LED.

Abstract: The packaging device includes a substrate, a mounting pad, a connecting pad and an interconnecting element. The substrate is substantially planar and has opposed major surfaces. The mounting pad is conductive and is located on one of the major surfaces. The connecting pad is conductive and is located on the other of the major surfaces. The conductive interconnecting element extends through the substrate and electrically interconnects the mounting pad and the connecting pad. The packaging device has a volume that is only a few times that of the semiconductor die and can be fabricated from materials that can withstand high-temperature die attach processes. The packaging device can be configured as the only packaging device used in the semiconductor device or as a submount for a semiconductor die that requires a high-temperature die attach process.

Abstract: A light emitting diode (LED) display device comprises a substrate and a plurality of walls disposed on the substrate, the plurality of walls forming a cavity, the cavity being filled with an encapsulant not including fluorescent material. An LED is disposed on a first portion of the substrate within the cavity. An electrical connection exists between the LED and a second portion of the substrate, and a fluorescent material overlay is located at a top end of the cavity. The LED display device alternatively includes a plurality of LEDs, wherein each LED is disposed within a separate cavity.

Abstract: A light source and method for making the same are disclosed. The light source includes a plurality of LEDs mounted on a substrate and a sensor for measuring light from the LEDs. Each LED emits light having a different spectrum from the other LEDs, the average intensity of light from that LED being determined by a drive signal coupled to that LED. The sensor generates a plurality of signals, each signal being characterized by a sensor value that is proportional to the intensity of light emitted by a corresponding one of the LEDs. A controller generates the drive signals and stores a current target value for each LED. The drive signals for each of the LEDs is generated such that the sensor value for that LED matches the stored current target value for that LED.

Abstract: A light source that generates light that is perceived to have a predetermined color is disclosed. The light source includes first and second red LEDs and a non-red light emitter. The first and second red LEDs emit light in the red portion of the spectrum but at different wavelengths. The non-red light emitter emits light at a wavelength in a non-red portion of the spectrum. A controller varies the intensity of the first and second red LEDs to provide a combined light signal that is perceived as having the predetermined color. In one embodiment, the non-red light emitter includes a fluorescent light, and the controller adjusts the intensities of the red LEDs to provide a source that is perceived as an incandescent source of a predetermined color temperature.

Abstract: A system and method for a reverse mounted light array. In one method embodiment, the present invention couples a reverse mounted light-generating source with a substrate. Additionally, the present invention couples an electrical portion of the reverse mounted light generating source with a conductive trace coupled to the reverse side of the substrate, wherein the coupling of the conductive trace with the substrate and the reverse mounted light generating source forms a reverse mounted light array.

Abstract: A white light emitting device by using off-white light emitting diodes (LED's). Rather than using just pure white LEDs, the white light emitting device arranges those LEDs which exhibit off-white colors in a manner such that the combination of light emanating from these off-white LEDs produces a radiation which appears substantially pure white to the human eye.

Abstract: A light source having an LED that is covered by a layer containing a phosphor is disclosed. The LED emits light in a first wavelength band. The phosphor containing layer includes particles that contain a phosphor having the formula Dy3A5O12, where A is at least one of the elements aluminum, gallium, indium, magnesium or silicon. The layer is positioned to receive a portion of the light from the LED and convert the light to light in a second wavelength band. The phosphor may be doped with Ce. Eu, and Tb, or a combination thereof.

Abstract: A light source has an attachment element attached to a hollow outer element. First and second leads extend through the attachment element. A light-emitting diode (“LED”) die is attached to a substrate portion of a lead. Elastomeric encapsulant disposed within the hollow outer element surrounds the LED die. The light source includes a chamber between the elastomeric encapsulant and the attachment element.

Abstract: A device and method for emitting output light utilizes both quantum dots and non-quantum fluorescent material to convert at least some of the original light emitted from a light source of the device to longer wavelength light to change the color characteristics of the output light. The device can be used to produce broad-spectrum color light, such as white light.

Abstract: Improved LED die mount. By mounting an LED die on a pedestal which is smaller than the LED die, formation of fillets of die mount material which would block some of the light from the LED die are reduced or eliminated.

Abstract: A white light emitting device by using off-white light emitting diodes (LED's). Rather than using just pure white LEDs, the white light emitting device arranges those LEDs which exhibit off-white colors in a manner such that the combination of light emanating from these off-white LEDs produces a radiation which appears substantially pure white to the human eye.

Abstract: An illuminated display is disclosed which allows characters to be displayed with near type-set like appearance. This is accomplished by using an appropriately formed and placed rib to connect the optically opaque inner member with the optically opaque base.

Abstract: A light source and method for programming the light source to provide a color that approximates that of a target light source are disclosed. The light source generates light at first and second wavelengths with intensities that are determined by first and second control signals that are set by a feedback controller that matches the outputs of a monitoring circuit to target signals. The target signals are generated from target values that are entered into the feedback controller by exposing the light source to the target light source and observing the outputs from a set of photodetectors incorporated in the light source. In one embodiment, the photodetectors in the monitoring circuit are used for this programming function.

Abstract: A system and method for generating white light involves using a combination of white, red, green, and blue LEDs to produce white light and adjusting the emitted light in response to feedback signals. A light system has a light source that includes at least one white LED and multiple color LEDs and a spectral feedback control system configured to detect light that is output from the light source and to adjust the light that is output from the light source in response to the light detection. The spectral feedback control system may include a color sensor configured to provide color-specific feedback signals, a controller configured to generate color-specific control signals in response to the color-specific feedback signals, and a driver configured to generate color-specific drive signals in response to the color-specific control signals.

Abstract: An optical encoder module includes a housing that includes at least one recess having an open end and an opposite closed end, and an electrical component accommodated within the recess. A first locking member is formed on the electrical component and a second locking member is formed in the housing. The first and second locking members are engaged with each other for locking the electrical component, when inserted into said recess, into a locking position. At least one resiliently compressible protrusion is provided between the electrical component and the closed end of the recess so as to be resiliently compressed therebetween into its compressed state when the electrical component is locked in the recess in its locking position.

Abstract: The invention relates to an adhesive attaching method for attaching a semiconductor die to a substrate in which an adhesive is deposited onto the substrate, the deposited adhesive is partially cured and/or dried, the partially cured and/or dried adhesive is reheated and a semiconductor die is placed onto the reheated adhesive, after which the adhesive is fully cured so that the semiconductor die is bonded, both electrically and mechanically, to the substrate.

Abstract: An optical encoder device is provided with an optical encoder for detecting codewheel/codestrip positions, an optical encoder housing for accommodating the optical encoder, a first tapered guidepost protruding from a sidewall of the optical encoder housing, the first guidepost having a star-shaped cross-section and being arranged adjacent to the optical encoder, and a second tapered guidepost protruding form the sidewall of the optical encoder housing and extending substantially parallel to the first guidepost, the second guidepost having a diamond-shaped cross-section and being arranged remote from the optical encoder.

Abstract: A light emitting diode (LED) display device comprises a substrate and a plurality of walls disposed on the substrate, the plurality of walls forming a cavity, the cavity being filled with an encapsulant not including fluorescent material. An LED is disposed on a first portion of the substrate within the cavity. An electrical connection exists between the LED and a second portion of the substrate, and a fluorescent material overlay is located at a top end of the cavity. The LED display device alternatively includes a plurality of LEDs, wherein each LED is disposed within a separate cavity.

Abstract: An apparatus for illumination comprises a light source operable to generate a radiation pattern. The apparatus further comprises a light guide adjacent the light source, which is operable to be illuminated by the radiation pattern. The light guide comprises a pattern of varying sized dots operable to diffusely reflect the illuminating radiation pattern. The dot pattern comprises monotonically increasing dot sizes intermediate between the smallest and the largest dot sizes, such that the smallest dot size is proximate to the light source and the largest dot size is distal from the light source.