Abstract: A rounded square lens is used instead of a hemispherical lens in an LED package to produce a substantially Lambertian light emission pattern. A cross-sectional view of the rounded square lens cut along its diagonal forms a semicircular surface so as to emulate a hemispherical lens in areas close to the diagonal. A cross-sectional view of the lens cut along its width bisecting the lens forms a bullet shaped surface narrower than the semicircular surface but having the same height as the semicircular surface. The four corners of the lens are rounded. The surface of the lens smoothly transitions between the two surface shapes. Since the rounded square lens has a diagonal dimension larger than a maximum allowable diameter of a hemispherical lens in the same package body, a larger LED die may be used with the rounded square lens to output more light without increasing the size of the package while maintaining a Lambertian emission.

Abstract: Repairs of clocks with worn wheel pivots may be made with a ball bearing pivot wheel support system. The system may utilize a standard sized ball bearing and a bushing in frictional engagement with an inner race of the ball bearing. The bushing may be bored to provide frictional engagement with the pivot wheel so that the pivot wheel may rotate without relative motion between the wheel pivot and the bushing.

Abstract: In one embodiment, a liquid crystal display assembly comprises a liquid crystal module, a backlight assembly comprising an array of light emitting diodes, a detector to detect an optical output of at least one light emitting diode, and a controller coupled to the detector wherein the controller comprises logic to record in a memory location a first output value from the detector at a first point in time for a plurality of light emitting diodes in the array of light emitting diodes, measure a second output value from the detector at a second point in time for the plurality of light emitting diodes in the array of light emitting diodes, and adjust at least one input value to the plurality of light emitting diodes based on a relationship between the first output value and the second output value.

Abstract: A light emitting device comprises a flip-chip light emitting diode (LED) die mounted on a submount. The top surface of the submount has a reflective layer. Over the LED die is molded a hemispherical first transparent layer. A low index of refraction layer is then provided over the first transparent layer to provide TIR of phosphor light. A hemispherical phosphor layer is then provided over the low index layer. A lens is then molded over the phosphor layer. The reflection achieved by the reflective submount layer, combined with the TIR at the interface of the high index phosphor layer and the underlying low index layer, greatly improves the efficiency of the lamp. Other material may be used. The low index layer may be an air gap or a molded layer. Instead of a low index layer, a distributed Bragg reflector may be sputtered over the first transparent layer.

Abstract: A light emitting device comprises a flip-chip light emitting diode (LED) die mounted on a submount. The top surface of the submount has a reflective layer. Over the LED die is molded a hemispherical first transparent layer. A low index of refraction layer is then provided over the first transparent layer to provide TIR of phosphor light. A hemispherical phosphor layer is then provided over the low index layer. A lens is then molded over the phosphor layer. The reflection achieved by the reflective submount layer, combined with the TIR at the interface of the high index phosphor layer and the underlying low index layer, greatly improves the efficiency of the lamp. Other material may be used. The low index layer may be an air gap or a molded layer. Instead of a low index layer, a distributed Bragg reflector may be sputtered over the first transparent layer.

Abstract: Repairs of clocks with worn wheel pivots may be made with a ball bearing pivot wheel support system. The system may utilize a standard sized ball bearing and a bushing in frictional engagement with an inner race of the ball bearing. The bushing may be bored to provide frictional engagement with the pivot wheel so that the pivot wheel may rotate without relative motion between the wheel pivot and the bushing.

Abstract: A rounded square lens is used instead of a hemispherical lens in an LED package to produce a substantially Lambertian light emission pattern. A cross-sectional view of the rounded square lens cut along its diagonal forms a semicircular surface so as to emulate a hemispherical lens in areas close to the diagonal. A cross-sectional view of the lens cut along its width bisecting the lens forms a bullet shaped surface narrower than the semicircular surface but having the same height as the semicircular surface. The four corners of the lens are rounded. The surface of the lens smoothly transitions between the two surface shapes. Since the rounded square lens has a diagonal dimension larger than a maximum allowable diameter of a hemispherical lens in the same package body, a larger LED die may be used with the rounded square lens to output more light without increasing the size of the package while maintaining a Lambertian emission.

Abstract: A substantially hemispherical lens surrounding an LED die is described that creates a sparkle as an observer views the lens from different angles. The lens is formed of an interconnected array of 100-10,000 or more lenslets. Each lenslet focuses an image of the LED die at an output of the lenslet such that the LED die image area at the output is less than 1/9 the area of the LED die to create a substantially point source image of the LED die at an outer surface of the lens. When the LED die is energized, the shape of each lenslet causes point source images of the LED die to be perceived by an observer at various viewing angles, such that the emitted LED light appears to sparkle and speckle as the observer moves relative to the lens.

Abstract: A white light LED flash for a digital camera is described that uses a blue light LED die in conjunction with red and green phosphor or quantum dot material over the LED die. The phosphor or quantum dot characteristics are selected so that the white light substantially matches an ambient light setting in the camera, such as the incandescent ambient light setting. Therefore, when a flash picture is taken under incandescent ambient light, and the flash emits the same type of light as the incandescent light, the flash will effectively brighten the incandescent light. The camera's color compensation algorithm associated with incandescent light illumination is then applied to the photograph and works optimally since the image is only illuminated by incandescent light. This concept is expanded to LED flashes that emulate other types of ambient light having associated color compensation algorithms programmed into the camera.

Abstract: A double-molded lens for an LED includes an outer lens molded around the periphery of an LED die and a collimating inner lens molded over the top surface of the LED die and partially defined by a central opening in the outer lens. The outer lens is formed using silicone having a relatively low index of refraction such as n=1.33-1.47, and the inner lens is formed of a higher index silicone, such as n=1.54-1.76, to cause TIR within the inner lens. Light not internally reflected by the inner lens is transmitted into the outer lens. The shape of the outer lens determines the side emission pattern of the light. The front and side emission patterns separately created by the two lenses may be tailored for a particular backlight or automotive application.

Abstract: A light emitting device comprises a flip-chip light emitting diode (LED) die mounted on a submount. The top surface of the submount has a reflective layer. Over the LED die is molded a hemispherical first transparent layer. A low index of refraction layer is then provided over the first transparent layer to provide TIR of phosphor light. A hemispherical phosphor layer is then provided over the low index layer. A lens is then molded over the phosphor layer. The reflection achieved by the reflective submount layer, combined with the TIR at the interface of the high index phosphor layer and the underlying low index layer, greatly improves the efficiency of the lamp. Other material may be used. The low index layer may be an air gap or a molded layer. Instead of a low index layer, a distributed Bragg reflector may be sputtered over the first transparent layer.

Abstract: A substantially hemispherical lens surrounding an LED die is described that creates a sparkle as an observer views the lens from different angles. The lens is formed of an interconnected array of 100-10,000 or more lenslets. Each lenslet focuses an image of the LED die at an output of the lenslet such that the LED die image area at the output is less than 1/9 the area of the LED die to create a substantially point source image of the LED die at an outer surface of the lens. When the LED die is energized, the shape of each lenslet causes point source images of the LED die to be perceived by an observer at various viewing angles, such that the emitted LED light appears to sparkle and speckle as the observer moves relative to the lens.

Abstract: A white light LED flash for a digital camera is described that uses a blue light LED die in conjunction with red and green phosphor or quantum dot material over the LED die. The phosphor or quantum dot characteristics are selected so that the white light substantially matches an ambient light setting in the camera, such as the incandescent ambient light setting. Therefore, when a flash picture is taken under incandescent ambient light, and the flash emits the same type of light as the incandescent light, the flash will effectively brighten the incandescent light. The camera's color compensation algorithm associated with incandescent light illumination is then applied to the photograph and works optimally since the image is only illuminated by incandescent light. This concept is expanded to LED flashes that emulate other types of ambient light having associated color compensation algorithms programmed into the camera.

Abstract: A double-molded lens for an LED includes an outer lens molded around the periphery of an LED die and a collimating inner lens molded over the top surface of the LED die and partially defined by a central opening in the outer lens. The outer lens is formed using silicone having a relatively low index of refraction such as n=1.33-1.47, and the inner lens is formed of a higher index silicone, such as n=1.54-1.76, to cause TIR within the inner lens. Light not internally reflected by the inner lens is transmitted into the outer lens. The shape of the outer lens determines the side emission pattern of the light. The front and side emission patterns separately created by the two lenses may be tailored for a particular backlight or automotive application.

Abstract: In one embodiment, a liquid crystal display assembly comprises a liquid crystal module, a backlight assembly comprising an array of light emitting diodes, a detector to detect an optical output of at least one light emitting diode, and a controller coupled to the detector wherein the controller comprises logic to record in a memory location a first output value from the detector at a first point in time for a plurality of light emitting diodes in the array of light emitting diodes, measure a second output value from the detector at a second point in time for the plurality of light emitting diodes in the array of light emitting diodes, and adjust at least one input value to the plurality of light emitting diodes based on a relationship between the first output value and the second output value.

Abstract: In one embodiment a video system comprises a connector selection module to receive a first video signal, a color correction module comprising logic to select a color correction routine for the first video signal based on at least one of a video format identifier associated with the first video signal, an input connector associated with the first video signal, or a metadata tag associated with a data file containing the first video signal, applying the color correction routine to the first video signal; and presenting the first video signal on a video display.

Abstract: A fly's eye detector includes a planar imaging array and an optical system that directs light with different incident directions to different sensors in the imaging array. One embodiment of the optical system includes a curved reflector above the planar imaging array to deflect and distribute light to the sensors. Another embodiment of the optical system includes a lens array providing variable offsets of micro-lenses relative to the underlying sensors.

Abstract: Light beam focusing components direct light from the top surface of a touch screen display to one or more imagers. The imager or imagers capture one or more images of the top surface of the touch screen display. A processing unit analyzes the image or images to determine the position of an input device on or near the top surface of the touch screen display.

Abstract: A fly's eye detector includes a planar imaging array and an optical system that directs light with different incident directions to different sensors in the imaging array. One embodiment of the optical system includes a curved reflector above the planar imaging array to deflect and distribute light to the sensors. Another embodiment of the optical system includes a lens array providing variable offsets of micro-lenses relative to the underlying sensors.