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A “Thick film Electroluminescence (EL) device” has advantages in its thin structure, light weight, uniform lighting, and mechanical flexibility (bending). From these advantages, the thick film EL can be regarded as the optimum light source for recent cars which require a high packaging density consisting of various components to be mounted in a small space. EL is now being used for light sources for both interior and exterior light sources for automotive applications utilizing its features. However, it has not yet reached a satisfactory level of performance and had only limited application areas because the thick film EL device up to today has a tendency that its luminous intensity rapidly decreases when used in a high temperature and high humidity environment. This time, we prototyped an EL device utilizing a transparent conductive film which can give moisture proof effect and uniform luminous intensity, and we evaluated and analyzed its performance.

Stanley has successfully developed a new concept model of analog type automotive cluster aiming for a thin and light weight structure. The cluster is made with a stepping motor and our original developement of segmented thick film EL. Objectives of Development, Background of Development, Development Procedures and Development Results are discussed in this paper.