Patent ID: 6624404
Filing Date: 2003-09-23
Classification: H01L

Abstract:
A CMOS image sensor comprising:a substrate including at least one photosensitive element for receiving an incident light; an interlayer-insulating film over the substrate; metal wire patterns on the interlayer-insulating film; a first protecting film covering the metal wire patterns and the portion of the interlayer-insulating film overlaying the photosensitive element; a flattening layer over the first protecting film; a second protecting film over the flattening layer and the portion of the first protecting film overlaying the metal wire patterns, having an adjustable refraction index for enhancing photosensitivity and thereby refracting and proceeding the incident light to the photosensitive element; color filter patterns over the second protecting film; a photoresist film covering the color filter patterns and the second protecting film and thereby flattening them, having an adjustable thickness for exactly focusing the incident light onto the photosensitive element; and at least one microlens over the photoresist film, wherein the thickness of the photoresist film is adjusted based on a focal length of a microlens.