A Large electroluminescent (EL) matrix display for conference signal is applicated in the Great Hall of the Peaple.The result is satisfactory. It consists of ACEL and DCEL of phosphor material. The whole size of the AC-EL screen is 2.5×3m

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composed of 30 single green screen of 0.46×0.46m

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. Average brightness is 20 cd/m

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and its contrast is 10:1. The size of DCEL screen is about lm2 with resolution of 120×144 yellow. Average brightness 45cd/m

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and contrast better than 10:1. Under room light condition

the display content could be seen clearly within distance of 65m

20m respectivelly. By analysing the characteristics of EL display for alphanumeric

it should be point that the control and match networks have important relation to brightness or contrast of EL display. Some block diagrams of the display and results of application are shown.