| 摘要 |
PURPOSE:To improve the color reproducibility of a picture, by making an area of a photodetecting section to which at least one color light among plural colors is made incident, different from that of the photodetecting section receiving other color light to avoid the wavelength of peak of each color in the spectral sensitivity characteristic from being shifted. CONSTITUTION:The length of the photodetecting sections 2a-2c in the direction of cross section (X direction) is taken respectively as 4:2:1, the length in the direction orthogonal to the cross sectional direction is taken the same, and the area of the photodetecting sections 3a-3c is taken respectively as 4:2:1. In irradiating a light to the solid-state image pickup element of the MOS structure, a signal from the photodetector sections 2a-2c is outputted successively by switching the MOSFET. In this case, the area of the photodetecting section 2a for blue light is taken twice that of the photodetecting section 2b for green light, and the area of the photodetecting section 2c for red light is taken as 1/2 of that of the 2b, then the spectral sensitivity of each color light is an equal value, 0.26. Thus, the amplification factor of the blue signal is less by 6 dB than the conventional system and the S/N ratio of the blue signal is improved remarkably. |
