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    • 3. 发明申请
    • EFFICIENT POLARIZED DIRECTIONAL BACKLIGHT
    • 有效的极化方向背光
    • WO2012158574A1
    • 2012-11-22
    • PCT/US2012/037677
    • 2012-05-12
    • REALD INC.ROBINSON, Michael, G.
    • ROBINSON, Michael, G.
    • G02B27/26G02F1/1335G02F1/13357
    • G02B27/26G02B5/3041G02B6/0048G02B6/0055G02B6/0056G02F1/13362H04N13/32
    • By introducing a stack of alternating high and low index dichroic material layers on the exit surface of a waveguide for a wedge type directional backlight, natural reflectivity differences between polarized components can be increased, effectively reflecting the vast proportion of S-polarized light rays, while at the same time transmitting the P-polarized light rays, of light impacting the exit surface of the waveguide at an angle sufficient to exit the waveguide. This recovers polarization in wedge type backlight systems, increasing illumination exiting the waveguide. Also, on the back reflecting surface of the waveguide, a birefringent material can be added to efficiently transform S-polarized reflected light from the dichroic stack, into returning P-polarized light. Because returning rays that are now P-polarized by the birefringent material have already achieved the critical angle for exiting the waveguide, the rays transformed to P-polarization can now also exit the waveguide, increasing waveguide illumination.
    • 通过在波导的出口表面上引入一叠交替的高折射率和低折射率的二向色性材料层用于楔形定向背光源,可以增加偏振分量之间的自然反射率差异,有效地反映了大部分的S偏振光线,同时 同时透射P偏振光,其以足以离开波导的角度冲击波导的出射表面。 这恢复了楔形背光系统中的极化,增加了离开波导的照明。 此外,在波导的背反射面上,可以添加双折射材料,以有效地将来自二向色层的S偏振反射光变换为返回的P偏振光。 因为现在由双折射材料P偏振的返回光线已经达到了用于离开波导的临界角,所以变换为P偏振的光线现在也可以离开波导,增加波导照明。