A new experiment was carried out on a modern HP-workstation with a 19" color screen under usual office lighting conditon. In the middle of the screen two adjacent fields of differnet colors were displayed, either 2° or 10° in size. Both of the fields were fixed to the same CIELUV color difference in relation to the background of the screen at 5, 20, 50 and 80 CIELUV units respectively. The task of the observer was to evaluate these adjustments-perceived color difference of the left field is bigger than, same as, or smaller than that of the right field. The result shows that equal CIELUV color differences on displays lead to quite different subjective ratings. In particular, chroma in CIELUV system is very much overstimated.