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AssigneeNippon Hoso Kyokai
InventorsTatsuhiko Kondo, Kenzo Seo, Shinetsu Itoh, Masaru Kanazawa, Kiyotaka Okada
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A projection type image display device utilizing an oil film is disclosed, which device comprises a filter having frequency characteristics enabling reduction of the spatial frequency response in the vertical direction for an input signal having a stepwise waveform in the vertical direction to a value under those obtained by using the following formula with respect to the coordinate x of the position of the scanning line in the vertical direction; f(x)=[1+sin (.pi..multidot.x/D.sub.O)]/2 where D.sub.O represents the smallest scanning line interval, outside of which adjacent scanning lines have no influences thereon, and filtering the input image signal according to those characteristics.
A signal processing filter for an image projection device utilizing an oil film in which a vertical direction response waveform relative to a vertical direction stepwise waveform input image signal has an incline at least one of equal to and smaller than an incline of a tangent line of the function
Dependencies are inferred from the claim text.