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    • 10. 发明授权
    • Gradient-free illumination of passive readout display devices
    • 无源显示设备的无梯度照明
    • US4502761A
    • 1985-03-05
    • US346507
    • 1982-02-08
    • Peter KnollWinfred K/o/ nigWolfgang Ziegler
    • Peter KnollWinfred K/o/ nigWolfgang Ziegler
    • G02F1/1335G02F1/13357G09F9/00G09F9/35G02F1/133F21V9/00G02B27/00
    • G02F1/133606G02F1/13336G02F1/133611G09F9/35G02F1/133604
    • Compensating darkening is provided over the area at the back of liquid crystal displays, so that light from one or more concentrated sources near the back of the display may result in essentially uniform illumination of the display through the LCD from the back. The compensating screen may be a developed film of suitable selected gradation, or a raster of points produced by half-tone process from such a film and printed either on a transparent foil or on the back of a translucent circuit board. Instead of being based on an exposed film, the density of the size of the raster points may be generated by a point-by-point light measurement recorded in computer memory and translated to point dimensions applied automatically by a plotter to a screen. A raster of circles with progressively wider spacing is useful for illumination by a single lamp. The layout of circles can be drawn according to a simple formula, keeping the ratio of line width to line spacing proportional to the third power of the cosine of the illumination angle.
    • 在液晶显示器背面的区域上提供补偿变暗,使得来自显示器背面附近的一个或多个浓缩源的光可以从后面通过LCD导致显示器的基本上均匀的照明。 补偿屏幕可以是合适的选定灰度的显影胶片,或者是由这种胶片通过半色调处理产生的点的光栅,并印在透明箔片上或印在透明电路板背面上。 而不是基于曝光的胶片,光栅点尺寸的密度可以通过记录在计算机存储器中的逐点光测量产生,并且被转换成由绘图仪自动应用于屏幕的点尺寸。 具有逐渐更宽间距的圆的光栅对于单个灯的照明是有用的。 可以根据简单的公式绘制圆的布局,将线宽与线间距的比例与照明角的余弦的第三功率成比例。