The Light Touch casts a big image from up close by bouncing lasers off a 0.4-inch microdisplay, using techniques from holography to keep the picture in focus despite the sharp projection angle.
Up till now, there are two theories with regard to the projection of the focus: Selkok's focus projecting principle and the accent delivering principle.
当前关于焦点投射问题存在着两种理论：塞尔克科的焦点投射原则和句子重音指派原则。
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Dynamic focus voltage error of projection display system was studied in this article. Parabola dynamic focus method, projection tube shape and optics processing were analyzed.