bildanzeigevorrichtung of durchprojektions type

摘要

It is an object of the present invention to provide a rear projection type image display device with a projection screen having an excellent contrast, by which stray light or unnecessary reflected light in a projection optical system can be reduced and light produced by reflection of outside daylight can be reduced. The rear projection type image display device comprises a single projection lens, a Fresnel lens sheet, and a lenticular lens sheet (4) having black stripes in an area where when the light entered through the Fresnel lens sheet is transmitted, the outgoing light does not pass, wherein when the angle (deg) of incidence to the lenticular lens sheet (4) is taken to be &thetas;, the total light transmittance (%) of the lenticular lens sheet to the light with the angle &thetas; of incidence is taken to be Tt(&thetas;), and the light transmittance loss by a light absorbent contained in the lenticular lens sheet is taken to be alpha , in the central part of the lenticular lens sheet, if ¦&thetas;¦=5 DEG , the expression Tt (&thetas;) 70 x (1 - alpha ) is satisfied, and if ¦&thetas;¦=20 DEG , the expression Tt (&thetas;) 50 x (1 - alpha ) is satisfied. IMAGE