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在全息光学元件已用于平显系统若干年后,还存在一些与许多这样的系统有关的持久的问题,即闪烁、虚假图象和重影,这些都是驾驶员通过全息元件或组合玻璃看亮光源时看到的结果.已经发现,闪烁和重影问题是由全息图上条纹的特殊方位引起的,更具体地说,是由于与全息图的正反两个表面相交的条纹太多造成的.换句话说,闪烁和重影问题是由与全息图任一表面相交的条纹密度和空间频率较高造成的.现在把话题转到根据本发明构成具有最低或很低空间频率的全息图的典型装置和方法上.图4a表明,组合玻璃20包括位于前玻璃基片26的球表面34上的明胶层28.在图4a中,后玻璃基片27由虚线表示,然而,只有完成明胶的曝光及处理以形成全息图后,后玻
Several years after the holographic optical element has been used in the flat display system, there are some persistent problems associated with many such systems, namely flicker, fake images and ghosting, all of which the driver looks through holographic elements or a combination of glass The result of seeing the bright light source It has been found that the problem of flickering and ghosting is caused by the special orientation of the stripe on the hologram and more specifically due to too many fringes intersecting the positive and negative surfaces of the hologram In other words, the problem of flickering and ghosting is caused by the higher density of stripes and the spatial frequency that intersects either surface of the hologram The subject is now turned to constructing a hologram having the lowest or very low spatial frequency according to the present invention 4a shows that the composite glass 20 comprises a gelatin layer 28 on the ball surface 34 of the front glass substrate 26. In Fig. 4a, the rear glass substrate 27 is indicated by the dotted line, however, only the gelatin After exposure and processing to form a hologram, the back glass