Solid-state image pickup device having reference voltage supply line on a first substrate and power supply lines to supply voltages to the reference voltage supply line on a second substrate

A solid-state image pickup device having a plurality of pixels, each including a photoelectric conversion unit, a floating diffusion, and a transfer transistor which transfers charges of the photoelectric conversion unit to the floating diffusion, a reset transistor which supplies a reset potential to the floating diffusion, an amplifier transistor which amplifies a signal obtained in accordance with potential changes of the floating diffusion and outputs a signal, a reference voltage supply line which supplies reference voltages to the photoelectric conversion unit, a first substrate including a pixel region including the photoelectric conversion unit, the floating diffusion and the transfer transistor, and the reference voltage supply line, and a second substrate including a pixel region including at least the reset transistor or the amplifier transistor, the solid-state image pickup device comprising:

• power supply lines configured to supply voltages to the reference voltage supply line and disposed on the second substrate;
• a plurality of first electric connection units configured to electrically connect the floating diffusions to the reset transistors and the amplifier transistors which are disposed on the second substrate;
• and
• a plurality of second electric connection units configured to electrically connect the reference voltage supply line to the power supply lines,
• wherein the first electric connection units are disposed in the pixel region of the first substrate and the second electric connection units are disposed outside the pixel region of the first substrate, and
• wherein a plurality of contact plugs configured to supply reference voltages from the power supply lines to wells included in the pixel region of the second substrate are disposed in the pixel region of the second substrate.