Illumination unit for a device having a multi-color reflective liquid crystal display
    22.
    发明授权
    Illumination unit for a device having a multi-color reflective liquid crystal display 失效
    具有多色反射型液晶显示装置的照明装置

    公开(公告)号:US06568841B2

    公开(公告)日:2003-05-27

    申请号:US09840207

    申请日:2001-04-23

    IPC分类号: G02F11335

    CPC分类号: G02B6/0038 G02B6/0056

    摘要: A reflective liquid crystal display (1) is provided with a front illumination unit. The front illumination unit comprises a flat waveguide (2), at least one surface of which is provided with a diffraction grating (7). A period of the diffraction grating (7) is of the order of the wavelength of the light. A light source (4) generates light of one or more colors, and the colors of light are sequentially coupled into the flat waveguide (2). The diffraction grating (7) is divided into separate areas (10, 11, 12). Each of these separate areas (10, 11, 12) is tuned to one particular wavelength of the light generated by the light source (4). Each separate area (10, 11, 12) is subdivided into various small areas so that the surface of the flat waveguide is subdivided into a large number of small areas (10-1, 11-1, 12-1, . . . 10-11, . . . 12-41). Each small area (10-1, 11-1, 12-1, . . . 10-11, . . . 12-41) is bounded by small areas (10-1, 11-1, 12-1, . . . 10-11, . . . 12-41) tuned to other light wavelengths. A polarizer (6) is present above the waveguide (2) to reflect light polarized in one direction back to the reflective liquid crystal display (1) and to transmit image-wise polarized light in a direction transverse to the one direction.

    摘要翻译: 反射型液晶显示器(1)设置有前照明单元。 前照明单元包括平坦波导(2),其至少一个表面设置有衍射光栅(7)。 衍射光栅(7)的周期为光的波长的数量级。 光源(4)产生一种或多种颜色的光,并且光的颜色顺序地耦合到平坦波导(2)中。 衍射光栅(7)被分成独立的区域(10,11,12)。 这些分离区域(10,11,12)中的每一个被调谐到由光源(4)产生的光的特定波长。 每个分离区域(10,11,12)被细分成各种小的区域,使得平坦波导的表面被细分为大量的小区域(10-1,11-1,12-1 ... 10 -11,... 12-41)。 每个小区域(10-1,11-1,12-1,...,10-11,...,12-41)都被小区域(10-1,11-1,12-1,...)限定。 10-11,... 12-41)调谐到其他光波长。 在波导(2)上方存在偏振器(6),以将在一个方向上偏振的光反射回反射型液晶显示器(1)并且在横向于该一个方向的方向上透射成像的偏振光。