Omnivision Proposes a Compact Way to Enhance DR in 4T Pixel

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Omnivision's patent application US20140103189 "Compact In-Pixel High Dynamic Range Imaging" by Gang Chen, Duli Mao, Hsin-Chih Tai, and Howard Rhodes proposes quite a minor modification in 4T pixel which dynamically changes its conversion gain based on the signal level. The proposal is to add few Vth-adjust implants under the RST gate, so that various gate areas go to inversion mode depending on the floating diffusion voltage:

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