Image sensing device

An image sensing device comprising:

• a pixel array including a plurality of subarrays consecutively arranged in the pixel array, each subarray including a first unit pixel block and a second unit pixel block adjacent to each other,
• wherein each of the first and second unit pixel blocks includes:
• a first subpixel block including a first floating diffusion region and a plurality of unit pixels sharing the first floating diffusion region;
• a second subpixel block including a second floating diffusion region and a plurality of unit pixels sharing the second floating diffusion region, the second floating diffusion region being configured to form a common floating diffusion node by connecting to the first floating diffusion region;
• and
• a first transistor array and a second transistor array respectively disposed at opposing sides of the first subpixel block,
• wherein the first transistor array includes:
• a plurality of conversion gain transistors configured to adjust a capacitance of the common floating diffusion node based on a plurality of conversion gain control signals;
• and
• a reset transistor configured to initialize the common floating diffusion node based on a reset signal,
• wherein the first transistor array of the first unit pixel block and the first transistor array of the second unit pixel block are arranged symmetrically.