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    • 15. 发明申请
    • Optical device, light-condensing backlight system, and liquid crystal display
    • 光器件,聚光背光系统和液晶显示器
    • US20060238867A1
    • 2006-10-26
    • US10556688
    • 2004-04-15
    • Kentarou TakedaNaoki TakahashiKazutaka HaraTakahiro Fukuoka
    • Kentarou TakedaNaoki TakahashiKazutaka HaraTakahiro Fukuoka
    • G02B27/28
    • G02B27/288G02F1/133536G02F2001/133541G02F2001/133638
    • An optical element of the invention comprises at least three laminated circular-polarization-type-reflection polarizers (a) whose wavelength bands for selective reflection of polarized light overlap one another; a layer (b1) which is placed between at least a pair of the circular-polarization-type-reflection polarizers (a) and has a front retardation of substantially zero (in the normal direction) and a retardation of at least λ/8 with respect to incident light inclined by at least 30° relative to the normal direction; and a layer (b2) which is placed between at least another pair of the circular-polarization-type-reflection polarizers (a) and has a front retardation of substantially zero (in the normal direction) and a retardation of at most μ/2 with respect to incident light inclined by 60° relative to the normal direction. The optical element condenses or collimates incident light from a light source and can control transmission of light at large incident angles relative to the normal direction, increase front brightness and reduce coloration.
    • 本发明的光学元件包括至少三个层叠的圆偏振型反射偏振器(a),其偏振光的选择性反射的波长带彼此重叠; 放置在至少一对圆偏振型反射偏振器(a)之间的层(b 1),并且具有基本上为零(在正常方向上)的前延迟和至少λ/ 8的延迟 相对于相对于法线方向倾斜至少30度的入射光; 和位于至少另一对圆偏振型反射偏振器(a)之间的层(b 2),并且具有基本为零(正向)的前延迟,并且延迟至多为mu / 2相对于相对于法线方向倾斜60°的入射光。 光学元件使来自光源的入射光凝结或准直,可以相对于法线方向控制大的入射角度的光的透射,增加前方亮度,减少着色。