title: A Dynamic Range Expansion Technique for CMOS Image Sensors with Dual Charge Storage in a Pixel and Multiple Sampling.
abstract: A dynamic range expansion technique for CMOS image sensors with dual charge storage in a pixel and multiple sampling technique is presented. Each pixel contains a photodiode and a storage diode which is connected to the photodiode via a separation gate. The sensitivity of the signal charge in the storage diode can be controlled either by a separation gate which limits the charge to flow into the storage diode or by controlling the accumulation time in the storage diode. The operation of the sensitivity control with separation gate techniques is simulated and it is found that a blocking layer to the storage diode plays an important role for high controllability of sensitivity of the storage diode. A prototype chip for testing multiple short time accumulations is fabricated and measured.
authors.affiliation: Graduate School of Electronic Science and Technology, Shizuoka University, 3-5-1 Johoku, Nakaku, Hamamatsu 432-8011, Japan. suhaidi@idl.rie.shizuoka.ac.jp.
authors.forename: Suhaidi
authors.initials: S
authors.lastname: Shafie
authors.affiliation: Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Nakaku, Hamamatsu 432-8011, Japan. kawahito@idl.rie.shizuoka.ac.jp.
authors.forename: Shoji
authors.initials: S
authors.lastname: Kawahito
authors.affiliation: Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Nakaku, Hamamatsu 432-8011, Japan. sito@idl.rie.shizuoka.ac.jp.
authors.forename: Shinya
authors.initials: S
authors.lastname: Itoh
keywords: Image sensor; motion blur.; multiple sampling; wide dynamic range