Color sensor and color sensing device

A color sensing device, comprising:

• a color sensor provided with at least three photosensitive areas and used for generating at least three photosensitive signals;
• a processing unit, being a semiconductor chip, connected to the color sensor and used for processing the at least three photosensitive signals to generate at least four channel signals;
• and
• a control unit connected to the processing unit, wherein the control unit processes the at least four channel signals to generate the at least three color signal tuples CIE(X,Y,Z) (International Commission on Illumination), and a number of the photosensitive signals is less than a number of the channel signals;
• wherein two of the color signal tuples CIE(X,Y,Z) share one of the at least three photosensitive signals, and a spectral function of stimulus value X1 and a spectral function of stimulus value Z on a CIE color space share a same filter disposed on the color sensor,
• wherein the spectral function of stimulus value Z is represented by the spectral function of stimulus value X1, or the spectral function of the stimulus value X1 is represented by the spectral function of stimulus value Z, or the spectral function of stimulus value Z and the spectral function of stimulus value X1 are represented by the spectral function of stimulus value (X1+Z)/2, respectively.