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Aviation History
1985
1985 - 2969.PDF
and is used to the CRT display, is used to colour, likes it, and expects it. So he foresees Big Picture being a full colour screen. Exactly how this will be achieved is not being revealed—most probably because the answer is still being worked out. But McDonnell Douglas Big Picture diagrams show the technology options being researched. Using a no shadow-mask CRT, a 100 lines per inch (LPI) resolution (equiv alent to a 2,000-line TV set) would be desired with 75 LPI as the minimum requirement. The projectors, one red, one green, and one blue, would presumably have to be situated far enough away from the screen to allow for the size of the display. Other options show a liquid crystal display (LCD)—familiar to anyone with a digital watch. The LCD modulates incident light and FLIGHT INTERNATIONAL, 2 November 1985 its viewability improves as the ambient light level increases. Colour LCDs, as Big Picture would demand, are available using filters or dyes—but the range of colours currently available is limited. Big Picture might use a matrix display. An electro-luminescent (EL) flat- panel display is the lightest of the flat-panel condensers and produces a bright display at low power levels, but is limited in colour and can be expensive to produce. "First we need to convince the US Air Force and industry that the requirement for Big Picture exists. Having said that, once the Air Force has recognised the requirement, industry will be quick to respond. The future threat and sensor capa bilities cannot readily use smaller CRTs. Present instrument panels are heavy and expensive. Big McDonnell Douglas compares the 15 per cent flexibility of today's fighter cockpit instrument panel ftopj with the 100 per cent flexibility that Big Picture provides. The large screen fuses into one source all the information currently displayed on gauges, dials, and small CRTs 23
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