Image Sensing Device

An image sensing device includes N red light sensing units, N green light sensing units, N blue light sensing units and a control circuit. The control circuit accumulates an exposure capacity Qi generated by the ith red light sensing unit, green light sensing unit, and blue light sensing unit in an exposure time Ti and an exposure capacity Qi+1 generated by the (i+1)th red light sensing unit, green light sensing unit, and blue light sensing unit in next exposure time Ti+1 until an exposure capacity QN generated in the TNth exposure time is accumulated, wherein i is an integer ranging from 1 to N. The exposure capacities Qi to QN are sequentially stored in a register and outputted from the control circuit, so that the image of each scan line can be sequentially transferred to an analog signal with the sum of the exposure capacities Qi to QN.