In order to improve the accuracy of colorimetric characterization of liquid crystal display (LCD), a piecewise partition model (PP model) was proposed concerning the LCD's poor performance of constant channel chromaticity and channel independence. The model involved two steps, first the relationship between the tristimulus values and their corresponding discrete integer values of individual color channel was regressed by using of piecewise quadratic polynomial, and then the proper interferential items were inserted according to different RGB subspaces' color characteristics for colorimetric characterization of LCD. The experimental results showed that the average/maximum color differences of this PP model were 1.5881/6.0249 CIELAB unit when the numbers of training and testing samples were 91 and 512 respectively. Compared with the methods of three-dimensional look-up table (3D-LUT), Mask, S-curve and two-primary crosstalk (TPC) models, the PP model performed best for the case of less training samples.