Color Plasma Display Panels (PDPs) is one of the important developing trends in the flat display field. The chromaticity coordinates measured on the PDP include two parts: the first part is chromaticity coordinate of phosphor on the PDP device

another is the chromaticity coordinate of gas discharge during the operation of PDP. In the process of fabricating a PDP

phosphor undergo the process of paste preparation

drying

sintering and aging etc. The chromaticity coordinates presented on the panel of PDP is thus somewhat different from that of raw phosphor. The aim of this paper is to measure the chromaticity coordinates of phosphor lighting. A new method is presented to obtain the chromaticity coordinates and brightness of phosphor on PDP by using the chromaticity coordinates and brightness of a monocolor and chromaticity coordinates and brightness of gas discharge under the same structure. A monocolor test panel is designed and fabricated for measuring the chromaticity coordinates of trichromatic phosphor lighting of PDP. The brightness and chromaticity coordinates of PDP and the brightness and chromaticity coordinates of gas discharge of PDP are all measured by using CRT Color Analyzer(CA-100). The chromaticity coordinates and brightness of phosphor on PDP is computed based on the linear superposition relation of tri-stimulus value of compound color and the tri-stimulus value of two known colors. At the same time

luminescence spectrum of PDP panel and gas discharge is measured with assembled multi-function raster spectrometer of WGD-3 type. The difference of two measured luminescence spectrum at the same wavelength is the luminescence spectrum of phosphor on PDP panel. The results show that the variation of chromaticity coordinates of green and blue phosphor is large and for red phosphor it is small which makes the white color temperature of PDP varies toward to the lower direction. The widths at half peak of luminescence spectrum of green and blue phosphor are both smaller than that of original phosphor. The peak luminous intensity is also decreased. The peak luminescence wavelength of green phosphor become 523.4nm from 526nm.