Abstract:
Ambient light is detected by a photodiode circuit by measuring the time taken for a digital output of the photodiode circuit to change state in response to exposure of a photodiode of the photodiode circuit to that ambient light. A nominal time for state change is calculated based on photodiode circuit characteristics. Furthermore, an effective time for the photodiode circuit digital output to change state is determined in a calibration mode where the photodiode has been disconnected and a reference current is applied to the circuit. An illumination value of the detected ambient light is then calculated as a function of: the measured time, the effective time and the nominal time.
Abstract:
A module is configured to control an electronic device equipped with an optical receiver for wireless remote control. The module includes a face detection circuit that detects the presence of a face within an area proximate to the electronic device. An optical transmission circuit operates to transmit an optical control signal to the electronic device in response a detected change in face detection status made by the face detection circuit. To assist operation of the face detection circuit, the optical transmission circuit is further configured to illuminate an area proximate to the electronic device.
Abstract:
A photosensor includes a photovoltage generator for generating a photovoltage, and a comparator for determining a number of integer multiples of a threshold voltage associated with the photosensor. A primary counter is incremented by the determined number of integer multiples. A voltage injector adds at least one unit of voltage to the comparator, with each voltage unit having a value less than the threshold voltage. A secondary counter determines a number of voltage units needed to cause the voltage in the comparator to attain an integer multiple of the threshold voltage.
Abstract:
An image sensor includes an array of digital pixels, a first frame store for storing reference data, and a second frame store for storing image data. The reference and image data are combine to cancel an off-set of the pixels in the array. A re-set and a calibration phase are performed while a shutter is closed to obtain reference data during a calibration phase. A comparator measures an off-set time to gather information on the off-set of the pixels. During or after an exposure phase a conversion time is measured representative of the illumination on the pixel. During the calibration phase the off-set is measured. This digital technique requires a much smaller voltage swing on the pixel, and known techniques and can be performed in a shorter time. This increases the overall frame rate of the image sensor since the time taken for the reset and calibration phases is less than the time taken for the exposure phase.
Abstract:
The image sensor includes a plurality of pixels, arranged in rows and columns to form a pixel array, each pixel having a pixel output. The image sensor includes at least two column bitlines for each pixel column, each column bitline connected to each pixel output in the pixel column and to a common readout amplifier. In one embodiment, the bitlines are not in the same plane and multiple bitlines are positioned one above the other, maximizing pixel efficiency.
Abstract:
A method for forming a sensor is provided, together with a sensor formed according to the method. Photoresist material is deposited on a surface of the sensor, and is then patterned and etched to form an array of microlens structures. The structures are spaced close together in a predetermined pattern so that when a reflow process is performed, the structures melt and coalesce to form a barrier. The barrier defines a region for constraining or channeling the flow of reagent and analyte samples used in bio-optical sensors.
Abstract:
A polarization sensitive solid state image sensor includes an integrated photodetector and polarizing assembly. The polarizing assembly is formed directly on an upper dielectric surface of the photodetector as a metal grid. The integral form of the device improves polarization operation and reduces manufacturing costs.
Abstract:
The image sensor includes a plurality of pixels, arranged in rows and columns to form a pixel array, each pixel having a pixel output. The image sensor includes at least two column bitlines for each pixel column, each column bitline connected to each pixel output in the pixel column and to a common readout amplifier. In one embodiment, the bitlines are not in the same plane and multiple bitlines are positioned one above the other, maximizing pixel efficiency.
Abstract:
A detection apparatus is for a computer to detect the presence or absence of a computer user. The absence of a user can trigger a computer display to power down, while the detected presence of a user can trigger the display to power back up, and, optionally, require a log in. The detection apparatus may operate automatically and thus may provide a reliable way of saving power and/or ensuring security of computer data.
Abstract:
In an apparatus, such as an optical mouse, relative motion between itself and an adjacent surface is detected. A lens focuses an image of the illuminated adjacent surface, and an image sensor receives the image and generates picture signals representing sequential frames of the image. A high-pass filter may filter the picture signals. An image processor may receive the high-pass filtered picture signals for correlating successive frames of the picture signals to derive an output representing the relative motion.