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    THIN HOLLOW BACKLIGHTS WITH BENEFICIAL DESIGN CHARACTERISTICS
    3.
    发明申请
    THIN HOLLOW BACKLIGHTS WITH BENEFICIAL DESIGN CHARACTERISTICS 有权
    具有优点设计特性的中空背光

    公开(公告)号：US20100156953A1

    公开(公告)日：2010-06-24

    申请号：US12600862

    申请日：2008-05-19

    申请人： Timothy J. Nevitt ,  Timothy J. Hebrink ,  Michael F. Weber ,  Rolf W. Biernath ,  David G. Freier ,  John A. Wheatley ,  Andrew J. Ouderkirk ,  Charles D. Hoyle ,  Kristopher J. Derks

    发明人： Timothy J. Nevitt ,  Timothy J. Hebrink ,  Michael F. Weber ,  Rolf W. Biernath ,  David G. Freier ,  John A. Wheatley ,  Andrew J. Ouderkirk ,  Charles D. Hoyle ,  Kristopher J. Derks

    IPC分类号： G09G5/10

    CPC分类号： F21V7/04 ,  G02B6/0055 ,  G02B6/0056 ,  G02B6/0068 ,  G02B6/0096 ,  G02F1/133603 ,  G02F1/133605 ,  G02F1/13362

    摘要： A backlight unit (10) has a hollow cavity (16) instead of employing a light guide. One or more light sources (24a-c), such as LEDs, are arranged to emit light into the cavity, which is formed by a front (12) and a back reflector (14). The backlight is typically of the edge-lit type. The backlight can have a large area, is thin and consists of fewer components than conventional devices. Its design permits light recycling. The unit emits light of a predefined polarisation and can be arranged to have desired horizontal/vertical viewing angle properties. Light is uniformly distributed within the guide and the light output (20b, 2Od) is substantially collimated. Such backlights occupy a specific region in a parameter space defined by two parameters: first, the ratio of the output emission area to the total source emission area should lie in the range 0.0001 to 0.1; and second, the ratio of the SEP to the height of the cavity (H) should be in the range 3 to 10, where the SEP is an average plan view source separation, a special measure of the average spacing of light sources in the plane of the unit. There is also a discussion on the required number of light sources N, their arrangement near the periphery of the cavity, as well as the shape and size of the output emission area. A required minimum brightness uniformity (VESA) value to be maintained, when a subset of Madjacent sources is switched off (where M is at least 0.1 N or M>2 or both), is also disclosed. The backlight can be used for a display or for general lighting purposes.

    摘要翻译： 背光单元（10）具有中空腔（16）而不是使用光导。 布置一个或多个光源（24a-c），诸如LED，以将光发射到由前部（12）和后部反射器（14）形成的空腔中。 背光通常是边缘照明型。 背光源可以具有较大的面积，较薄并且由比传统设备更少的组件组成。 其设计允许光回收。 该单元发射预定极化的光，并且可以被布置成具有期望的水平/垂直视角特性。 光均匀分布在引导件内，并且光输出（20b，20d）基本准直。 这样的背光灯占据由两个参数定义的参数空间中的特定区域：首先，输出排放面积与总排放源面积的比值应在0.0001到0.1的范围内; 第二，SEP与空腔高度的比值（H）应在3到10的范围内，其中SEP是平均平面视图源分离，平面中光源的平均间距的特殊测量 的单位。 还有关于所需数量的光源N的讨论，它们在空腔的周边附近的布置以及输出发射区域的形状和尺寸。 还公开了当Madjacent源的子集（其中M为至少0.1N或M> 2或两者）时要维持的所需的最小亮度均匀性（VESA）值。 背光可用于显示器或用于一般照明目的。