LCD dominates the display market in both desktop and TV due to improved performance and reduced cost. In this paper, the two remaining LCD color issues (color crosstalk and color primary shift) are analyzed. The two issues cause a LCD to deviate from an ideal additive display and lead to a gray tracking problem. A new gray tracking algorithm was developed. The algorithm iteratively measures and corrects the white point of the display until the target chromaticity is reached. The algorithm can be implemented in the 1D gamma table and significantly improves the gray tracking performance of LCD.