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An instrument panel of a large area liquid crystal display (LCD), including a 50 segment bargraph speedometer, a six digit odo/trip/tacho meter, two gauges and several warning indicators, has been developed. The LCD cell evaluated for this instrument panel is operated in a reflective twisted nematic mode and dimensions of the cell are 260 × 110 × 3 mm. The liquid crystal material is capable of operating over a wider temperature range from −30°C to 80°C and the response time is less than 1 second at −20°C without heaters. The LCD instrument panel can display in multi-color by using high performance dichroic polarizers. Finally feasibility of the large area LCD instrument panel is investigated.

An LCD instrument panel, which displays a vehicle’s speed, an engine revolution, a fuel level and a coolant temperature, in digital or bargraph form on a single, large area LCD, has been developed. In adapting electronic items to the instrument panel, a single chip 8-bit microcomputer which manages most of the signal processing with excellent software techniques, a specially designed LCD driver IC and some hybrid-ICs have been employed. In this way, a minimised electronic assembly and a very suitable display were designed so that mass-production became possible.

A new liquid crystal display module integrating a LC cell of reflective type, printed circuits and a driver IC on a piece of plastic (polyethersulfone) is developed for automotive dashboard instrumentation. The module, which includes an LC cell with 22 leads to display, can be interfaced directly to a microprocessor with only 8 external leads. The module is flexible so that compact assembly with the systems is possible.