In a cut mask preparation method of displayed image on a screen of display means to prepare a cutting mask, an area lying across a real region and a background region is designated as a training area, for picture elements in which area a YMC three plate histogram is prepared to determine a threshold through discrimination analysis. A plate among the three plates, which has a maximum estimating function used upon the threshold determination, is used and binary-coded with said threshold to prepare a mask for a picture element included in one between the binary-coded values.

 
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< Backlight system for liquid crystal display comprising prism lens having apex angle of 80.degree.-85.degree. and refractive index of 1.57-1.59

< Transmission type projection screen

> Rear projection screen

> Rear projection screen having reduced scintillation

~ 00068