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    • 7. 发明授权
    • Dark current reduction in image sensors via dynamic electrical biasing
    • 通过动态电气偏置影像传感器的暗电流降低
    • US09451188B2
    • 2016-09-20
    • US14285247
    • 2014-05-22
    • InVisage Technologies, Inc.
    • Hui TianPierre Henri Rene Della Nave
    • H04N5/361H04N5/369H04N9/04H04N5/363H04N5/3745H04N5/357
    • H04N5/378H04N5/2253H04N5/3575H04N5/361H04N5/363H04N5/3698H04N5/3745H04N5/3765H04N9/045H04N2209/047
    • In various embodiments, an image sensor and method of using an image sensor are described. In an example embodiment, the image sensor comprises a semiconductor substrate and a plurality of pixel regions with each pixel region comprising an optically sensitive material over the substrate and positioned to receive light. There is a bias electrode for each pixel region, with the bias electrode configured to provide a bias voltage to the optically sensitive material of the respective pixel region. Also included is a pixel circuit for each pixel region with each pixel circuit comprising a charge store formed on the semiconductor substrate and a read out circuit, the charge store being in electrical communication with the optically sensitive material of the respective pixel region. The pixel circuit is configured to reset the voltage on the charge store to a reset voltage during a reset period, to integrate charge from the optically sensitive material to the charge store during an integration period, and to read out a signal from the charge store during a read out period. The pixel circuit includes a reference voltage node to be coupled to the charge store during the reset period and the read out circuit during the read out period where a reference voltage is applied to the reference voltage node and is configured to be varied during the operation of the pixel circuit.
    • 在各种实施例中,描述了使用图像传感器的图像传感器和方法。 在示例性实施例中,图像传感器包括半导体衬底和多个像素区域,每个像素区域在衬底上包括光敏材料并被定位成接收光。 对于每个像素区域存在偏置电极,其中偏置电极被配置为向相应像素区域的光敏材料提供偏置电压。 还包括每个像素区域的像素电路,每个像素电路包括形成在半导体衬底上的电荷存储器和读出电路,电荷存储器与相应像素区域的光敏材料电连通。 像素电路被配置为在复位周期期间将电荷存储器上的电压复位为复位电压,以在积分期间将来自光敏材料的电荷集成到电荷存储器,并且在电荷存储期间读出来自电荷存储器的信号 读出期。 像素电路包括在复位周期期间耦合到电荷存储器的参考电压节点和在读出周期期间的读出电路,其中参考电压被施加到参考电压节点,并且被配置为在操作期间变化 像素电路。