Patent application number | Description | Published |
20110019205 | Apparatus and method for implementing a touchless slider - A method for gesture recognition in an optical system using a touchless slider is shown. The touchless slider has first and second reference points positioned along an axis in an optical system. The method includes obtaining a plurality of first and second reflectance values by measuring an amplitude of light reflected from an object relative to the first and second reference points, respectively, wherein each first and second reflectance value corresponds to a different point in time. The plurality of first and second reflectance values are compared to identify a plurality of ratio values between the first and second reflectance values, wherein each of the plurality of ratio values corresponds to one of the points in time. At least one of a position and a direction of movement of the object relative to the first and second reference points is determined based on the identified plurality of ratio values. | 01-27-2011 |
20110157109 | HIGH-VOLTAGE CONSTANT-CURRENT LED DRIVER FOR OPTICAL PROCESSOR - An LED driver comprises a first transistor for setting an output current level at an output of the LED driver that is responsive to a programmable current and an input signal. A second transistor in series with the first transistor provides voltage protection for the first transistor. The first transistor and the second transistor support an output voltage higher than a maximum operating voltage of either of the first or the second transistor alone. Biasing circuitry generates an adaptive bias voltage for the second transistor to protect the first transistor and the second transistor from high voltage levels at the output of the LED driver. | 06-30-2011 |
20110248151 | System and Circuit Including Multiple Photo Detectors - A system includes a plurality of photo detectors, which generate signals proportional to incident light. The system further includes an optical barrier adjacent to a surface and includes a control circuit. The optical barrier partially obstructs reflected light from reaching the plurality of photo detectors to produce a spatially dependent reflectance pattern that is dependent on a position of an object relative to a substrate. The control circuit determines a position of the object during a reflectance measurement cycle using each of the plurality of photo detectors by calibrating to ambient light conditions, measuring ambient plus reflected light, determining the reflected light and detecting the position of the object based on a ratio of the reflected light received by at least two of the plurality of photo detectors. | 10-13-2011 |
20110248152 | Apparatus and Circuit with a Multi-Directional Arrangement of Optical Elements - An apparatus includes a housing having a front surface, a rear surface, and at least one sidewall therebetween and a plurality of optical windows formed in the housing to allow light to pass through from multiple directions. The apparatus further includes a plurality of photo detectors to generate electrical signals based on received light, where each of the plurality of photo detectors is disposed within a respective one of the plurality of optical windows. The apparatus also includes a control circuit coupled to the plurality of photo detectors to receive the electrical signals, determine light variations from the electrical signals, and determine a change in position of an object based on variation ratios of the light variations received by at least one pair of photo detectors within the plurality of photo detectors in response to determining the light variations. | 10-13-2011 |
20110248170 | METHOD AND APPARATUS FOR SPECTRALLY-CORRECTED AMBIENT LIGHT SENSOR - In one embodiment, a method includes receiving outputs from multiple photodetectors, calculating a first ratio between first and second such outputs, calculating a second ratio between the first output and a difference corresponding to a flicker noise component obtained from the second output, and determining a contribution from multiple illumination types based at least in part on the first and second ratios. The method may also include obtaining multiple correction coefficients based at least in part on the determined contribution, and in turn determining an ambient light type present in proximity to the photodetectors using the correction coefficients and the first and second outputs. | 10-13-2011 |
20110248194 | SYSTEMS AND METHODS FOR ADVANCED MONITORING AND CONTROL USING AN LED DRIVER IN AN OPTICAL PROCESSOR - Systems and methods for advanced monitoring and control using an LED driver in an optical processor are described. In an embodiment, a monitoring and control circuit may include a light-emitting diode (LED) driver including a control input, an output, and a node, wherein the output is coupled to an LED. The circuit may also include a multiplexer coupled to the node of the LED driver, an analog-to-digital converter coupled to the multiplexer, and a controller coupled to the analog-to-digital converter and to the control input of the LED driver, wherein the LED driver is coupled to drive the output with a first voltage supply that is independent from a second voltage supply that is coupled to drive the controller. | 10-13-2011 |
20110248649 | SYSTEMS AND METHODS FOR A DIGITAL-TO-CHARGE CONVERTER (DQC) - Systems and methods for a digital-to-charge converter (“DQC”) are disclosed. A DQC may include a converting circuit configured to receive a first digital signal indicative of a voltage across a capacitor coupled to an output pin of the digital-to-charge converter and to determine a present charge of the capacitor based at least in part on the first digital signal. The DQC may also include an error determining circuit coupled to the converting circuit, wherein the error determining circuit is configured to receive a second digital signal indicative of a target charge via an input pin of the digital-to-charge converter and to determine a difference between the target charge and the present charge. The DQC may further include a correction circuit coupled to the error determining circuit and configured to control a programmable current source to produce an analog signal at the output pin in response to the determined difference. | 10-13-2011 |
20110248961 | Device Including Multi-Function Circuitry Having Optical Detectors and Method of Flip-Chip Assembly Therefor - A device includes a substrate is substantially transparent and includes a contact surface and an interface surface. The interface surface includes a plurality of electrical contacts. The device further includes a semiconductor die, which includes a plurality of connections, a first photo detector and a second photo detector. Each of the plurality of connections includes a connection bump formed thereon to couple to the plurality of electrical contacts of the interface surface of the substrate. The plurality of connections positioned relative to the first and second photo detectors to alter a directional response of at least one photo detector of the plurality of photo detectors. | 10-13-2011 |
20120001841 | IDENTIFYING AMBIENT LIGHT TYPE AND ILLUMINANCE COMPENSATION USING A PLURALITY OF PHOTODETECTORS - A method for determining an ambient light type is described. The method includes receiving measurement information from multiple photodetectors configured for different light spectra, calculating a color ratio using the measurement information, obtaining a correction value using the color ratio, applying the correction value to at least one of the first and second measurement information to obtain a photopic illuminance value, and determining an ambient light type using the photopic illumination value and the color ratio. | 01-05-2012 |