发明名称 OPTICAL ELEMENT, SURFACE LIGHT SOURCE UNIT AND LIQUID CRYSTAL DISPLAY
摘要 PROBLEM TO BE SOLVED: To develop an optical element for forming a surface light source apparatus where deterioration in performance owing to tight adhesion to an adjacent member and a damage in form hardly occur, which is excellent in handling workability and which emits a light with excellent directivity in front, and also forming a liquid crystal display device which is excellent in luminance. SOLUTION: The optical element consists of the laminated body of circular polarizing separation boards A and B (1 and 2) consisting of cholesteric liquid crystal layers (11-13 and 21-23) with a Grandjean structure, the board A selectively reflects the same circular polarization light at right and left within a wavelength range being >=200 nm, the reflection light comprises the wavelength range being 520-580 cm, the left and right of the circular polarization light are inverted, which is selectively reflected against the board B, and an end at the short wavelength side of the selection reflected wavelength range is positioned in 550-580 nm wavelength area. The optical element is arranged on the sidelight type or a right-down type surface light source with a triple wavelength tube as a light source in the surface light source unit. Then the liquid crystal display device consists of the surface light source unit and the optical element. Thus, a light within a specified wavelength range which transmits the proceeding circular polarizing separation board is selectively reflected against the succeeding circular polarizing separation board and shielded.
申请公布号 JP2002258048(A) 申请公布日期 2002.09.11
申请号 JP20010060005 申请日期 2001.03.05
申请人 NITTO DENKO CORP 发明人 TAKAHASHI NAOKI;KAMEYAMA TADAYUKI
分类号 G02B5/30;C09K3/00;F21V8/00;F21V9/14;F21Y103/00;G02F1/1335;G02F1/13357 主分类号 G02B5/30
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