The invention discloses an
external bias pixel structure of a light receiving stage circuit in a dynamic
vision sensor pixel. The
external bias pixel structure comprises a
photodiode, a logarithmic tube, an
amplifier tube, a switch tube and a bias tube, the bias tube, the switch tube and the
amplifier tube are sequentially connected in series, a source
electrode of the bias tube is connected with a power supply, a drain
electrode of the bias tube is connected with a drain
electrode of the switch tube, a source electrode of the switch tube is connected with a drain electrode of the
amplifier tube, and a source electrode of the amplifier tube is grounded; the grid electrode of the bias tube is in
signal connection with Vbias, the grid electrode of the switch tube is in
signal connection with Vcpr, the source electrode of the switch tube and the drain electrode of the amplifier tube are connected with the grid electrode of the logarithmic tube, the drain electrode of the logarithmic tube is connected with a power supply, the source electrode of the logarithmic tube is connected with the negative electrode of the
photodiode, and the positive electrode of the
photodiode is grounded. And a grid electrode of the amplifier tube is also connected between the source electrode of the logarithmic tube and the negative electrode of the photodiode.