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    • 4. 发明公开
    • Rear projection type image display device
    • Bildanzeigevorrichtung vom Durchprojektions-Typ
    • EP0896244A1
    • 1999-02-10
    • EP98114898.4
    • 1998-08-07
    • Kuraray Co., Ltd.
    • Funazaki, KazuoKobayashi, Hideki
    • G03B21/62H04N9/31G02B3/00
    • G02B3/08G03B21/625H04N5/74
    • 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 θ, the total light transmittance (%) of the lenticular lens sheet to the light with the angle θ of incidence is taken to be Tt(θ), and the light transmittance loss by a light absorbent contained in the lenticular lens sheet is taken to be α, in the central part of the lenticular lens sheet, if |θ|=5°, the expression Tt (θ) > 70 x (1 - α) is satisfied, and if |θ|=20°, the expression Tt (θ) is satisfied.
    • 本发明的目的是提供一种背投型图像显示装置,其具有具有优异对比度的投影屏幕,通过该投影屏幕可以减少投影光学系统中的杂散光或不必要的反射光并且通过外部日光的反射产生的光 可以减少 背投影型图像显示装置包括单个投影透镜,菲涅耳透镜片和在通过菲涅耳透镜片进入的光被透射的区域中具有黑条纹的双凸透镜片(4),出射光不 通过,其中当入射到双凸透镜片(4)的角度(deg)被视为&lt;透镜片时,双凸透镜片对于具有角度的角度的光的总透光率(%); 的入射角被认为是Tt(&Thetas;),并且通过由双凸透镜片所包含的光吸收剂获得的透光率损失在双凸透镜片的中心部分被取为α,如果| |θ= 5 DEG,满足表达式Tt(&thetas;)> 70 x(1-α),如果|&Thetas; | = 20 DEG,则满足表达式Tt(&Thetas;)<50 x(1-α)。