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An ITO/BaTi03 /ZnS:Mn/black insulator/Al ac thin film electroluminescent display device with high display viewability has been developed for the application in the automotive dashboard display. The device consists of back and front insulating layers and a ZnS:Mn luminescent layer. The back insulating layer consists of the GaAs light absorption layer and the Hf O2 insulating layer. This device exhibits high contrast ratio (greater than 2:1) in an ambient illumination of 10,000 ft-candle at 125 ft-L brightness. This high contrast device also shows low power consumption due to placement of the black GaAs absorption layer between Hf O2 insulating layers in the back side. This is a significant improvement over previously published results. Detailed experimental results will be presented.

An at thin film electroluminescent display device with a structure of anti-reflection layer/glass/ITO/BaTiO3 /ZnS:Mn/black insulator/Al has been developed which is applicable as an automobile dashboard display. The device revealed high brightness and high contrast ratio which can be further improved by applying an anti-reflection coating (ARC) on the front glass surface. Under an ambient illumination of 10,000 ft-candle, with a brightness of 200 ft-L, the contrast ratio is 3.5 and increases to 4.5 when an anti-reflection coating is applied. There is a significant improvement compared to the formerly reported one (Contrast ratio = 2, brightness = 125 ft-L, under the same illumination).