Konzept zur optischen Abstandsmessung

Abstract

US 20110037969 A1 UPAB: 20110302 NOVELTY - The structure (400) has a photoactive region (402) integrated on a substrate for generating charge carriers in responsive to radiation incident on the photoactive region. A reference potential terminal acts as a charge carrier sink. Four transfer gates (404) in the form of metal oxide semiconductor (MOS) capacitors transport the charge carriers generated from the photoactive region. One of the transfer gates connects the photoactive region to the reference potential terminal during a time outside drive intervals, such that the transfer gates are driven at every point in time during a cycle. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a system for optical distance measurement (2) a method for optical distance measurement by a pixel structure (3) a tangible computer-readable medium storing a set of instructions to perform a method for optical distance measurement by a pixel structure. USE - Time of flight (ToF) pixel structure for measuring optical distance for ToF three-dimensional imaging. ADVANTAGE - The ambient light can be recorded nearly at the same time as the signal and subsequently be subtracted from a useful signal, thus increasing the measuring speed. The reset noise is not dependent on the photoactive region, by separating the detection and read-out nodes, thus reducing small selected floating diffusions when using large-area photoactive regions and read-out nodes of small sizes. The pixel structure offers a way of accumulating charge carriers multiple times within the floating diffusion of the pixel structure, by emitting the radiation pulse multiple times, thus minimizing magnitude of the reset noise and increasing dynamic range and signal-to-noise power ratio