Abstract

Recently, several potential color thin-film electroluminescence (TFEL) structure have been discussed. The candidates appear to be the patterned phosphor and the patterned filter structure, as illustrated in Fig. 1. The patterned phosphor structure has more process complexity, but it minimizes the requirements for the luminance of the color phosphors. The latest results of luminance for red and green EL are close to the required level. Very recently, a full color TFEL matrix display panel with Ce-doped alkaline-earth thiogallate used as blue phosphor has been demonstrated.¹ On the other hand, patterned filter structure takes advantage of the broad band emission characteristics of the white phosphor in blue to red part of the spectrum and uses a filter to produce the primary red, green and blue colors.² This structure has the least complexity from the process point of view. Although this structure has many advantages, it creates the most stringent demands for the luminance of white EL phosphors. Recently, a full color TEEL matrix display panel using white EL phosphors and color filters has been demonstrated.^3,4

© 1995 IEEE