BACK PROJECTION TYPE IMAGE DISPLAY DEVICE AND TRANSMISSIVE SCREEN TO BE USED FOR SAME DEVICE

摘要

PURPOSE:To obtain the high contrast of an image and to shorten the depth of a back projection type image display device. CONSTITUTION:Light diffusing particulates are not dispersed in the base material of a renticular lens sheet constituting a transmissive screen 1. A liquid cooling medium is charged into the space of a coupler 9G arranged between a projection type CRT 7G and a projection lens 8G. The inside of a case body 12 is blackened. When there is external light such as illumination light, the contrast ratio of an image is >=70. When screen size is 35 inches in the diagonal size, a projection distance from the light radiation face of the lens 8G up to the screen 1 is about 560mm, the diagonal size of the screen 1 is about 890mm and a picture angle is about 77 deg.C.