公开(公告)号：US06239851B1

公开(公告)日：2001-05-29

申请号：US09051504

申请日：1998-07-06

申请人： Tsuyonobu Hatazawa ,  Hideki Hayashi ,  Kozo Nakamura ,  Takashi Watanabe ,  Johji Mamiya ,  Masaru Suzuki ,  Hiroshi Tanase

发明人： Tsuyonobu Hatazawa ,  Hideki Hayashi ,  Kozo Nakamura ,  Takashi Watanabe ,  Johji Mamiya ,  Masaru Suzuki ,  Hiroshi Tanase

IPC分类号： G02F11335

CPC分类号： G02B6/0056 ,  G02B6/0001 ,  G02B6/0038 ,  G02B6/0053 ,  G02B6/0055 ,  G02F1/133536 ,  G02F1/13362 ,  G02F2001/13355

摘要： The purpose of the invention is to provide a light guide of a variety of forms having a uniform distribution of brightness in the plane and a planer light source device for a liquid crystal display device which uses such light guide. The light guide comprises a first surface which is a surface to which a natural polarization light is incident and a second surface other than the first surface which is an exit surface of a specific polarization light into which, said natural polarization light is modulated, wherein; said light guide has an interface of two materials of different indices of refraction oriented at an angle of &thgr;B+/−&agr; degrees relative to the primary propagation direction of said incident light, said &thgr;B being an angle satisfying Brewster's condition, more than two orientations of said interface exist in a single light guide, and the difference between the indices of refraction of the two materials of different indices of refraction is between 0.001 and 1.0. &thgr;B is typically about 45 degrees. The light guide comprises a first transparent member having a plurality of upwardly convex right angle isosceles triangles on a first surface thereof and a first index of refraction and a second transparent member having a plurality of downwardly convex right angle isosceles triangles on a second surface thereof and a second index of refraction, and said first surface and said second surface contact each other.

摘要翻译： 本发明的目的是提供一种在平面中具有均匀分布的亮度的各种形式的光导和使用这种光导的液晶显示装置的平面光源装置。 光导包括作为自然极化光入射的表面的第一表面和除了所述自然偏振光被调制到其中的特定偏振光的出射表面的第一表面以外的第二表面，其中： 所述光导具有相对于所述入射光的主传播方向以θB+/-α度的角度定向的不同折射率的两种材料的界面，所述θB是满足布鲁斯特状态的角度，所述多个方向 界面存在于单个光导中，不同折射率的两种材料的折射率之差在0.001和1.0之间。 θB通常约为45度。 光导包括第一透明构件，在第一透明构件的第一表面上具有多个向上凸起的直角等腰三角形和第一折射率，第二透明构件在其第二表面上具有多个向下凸出的直角等腰三角形， 第二折射率，并且所述第一表面和所述第二表面彼此接触。