Rear projection screen containing Fresnel lens sheet utilizing alternative focal lengths
作者： Katsunori Takahashi
DOI:
关键词: Projection screen 、 Lens (optics) 、 Physics 、 Focal length 、 Cylindrical lens 、 Lens speed 、 Optics 、 Lenticular lens 、 Fresnel lens 、 Simple lens
摘要: A Fresnel lens sheet (11) used in combination with a lenticular (12) to form rear projection screen of TV set, has elements (15) on front surface thereof. The include first group (15a) and second (15b). focal length (f 1 ) which is greater than 2 the (15b) are disposed alternately. above configuration provides an increased vertical angular range viewing region from pictures displayed can be viewed satisfactorily, as well luminance screen.
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