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31. 发明授权

US6157119A Shadow mask with improved color purity adjustment margin 有权
标题翻译：阴影面具具有改善的色纯度调整余量
公开(公告)号：US6157119A
公开(公告)日：2000-12-05
申请号：US154658
申请日：1998-09-18
申请人： Hao-Cheng Hung , Wen-Chi Chen , Yu-Hsin Hu , Chun-Hung Lu
发明人： Hao-Cheng Hung , Wen-Chi Chen , Yu-Hsin Hu , Chun-Hung Lu
IPC分类号： H01J29/07 , H01J29/80
CPC分类号： H01J29/07 , H01J2229/075 , H01J2229/0788
摘要： An apertured shadow mask in a color cathode ray tube (CRT) serves as a color selection electrode in permitting each of the three electron beams to be incident only upon its associated color-producing phosphor elements on the CRT's display screen. The apertures are arranged in vertical columns and horizontal rows in the shadow mask with aperture spacing defined by a vertical pitch (P.sub.v) i.e., the vertical spacing between adjacent apertures within the same vertical column where the apertures in one row are in different columns than the apertures in adjacent rows, and a horizontal pitch (P.sub.h), i.e., the horizontal spacing between adjacent apertures in the same horizontal row. To increase the color purity adjustment margin particularly in the corners of the display screen while still maintaining sufficient vertical spacing between adjacent phosphor dot color trios for a high degree of video image resolution, P.sub.v is defined in terms of a monotonic decreasing function in the horizontal direction and a monotonic increasing function in the vertical direction as follows:P.sub.v (X,Y)=P.sub.vo .times.F(X).times.G(Y)where P.sub.vo =vertical pitch of apertures at Y=0 and X=0;F(X)=1+a.sub.1 X.sup.2 +a.sub.2 X.sup.4 +a.sub.3 X.sup.6 +. . . ;G(Y)=1+b.sub.1 Y.sup.2 +b.sub.2 Y.sup.4 +b.sub.3 Y.sup.6 +. . . ;a.sub.1, a.sub.2, a.sub.3, . . . are constants and a.sub.1 0.
摘要翻译：彩色阴极射线管（CRT）中的有孔的荫罩用作选色电极，允许三个电子束中的每一个仅在其CRT显示屏上的相关联的产生荧光体元件上入射。孔被布置在阴影掩模中的垂直列和水平行中，孔间隔由垂直间距（Pv）限定，即在同一垂直列内的相邻孔之间的垂直间距，其中一行中的孔与相邻行中的孔和水平间距（Ph），即相同水平行中相邻孔之间的水平间隔。为了提高色纯度调节裕度，特别是在显示屏的拐角处，同时在相邻的荧光点颜色三色之间仍然保持足够的垂直间隔以获得高度的视频图像分辨率，Pv是根据在水平方向上的单调递减函数来定义的和垂直方向上的单调递增函数如下：Pv（X，Y）= PvoxF（X）xG（Y）其中Pvo = Y = 0且X = 0时的孔的垂直间距; F（X）= 1 + a1X2 + a2X4 + a3X6 +。。。 ; G（Y）= 1 + b1Y2 + b2Y4 + b3Y6 +。。。 ; a1，a2，a3，... 。。是常数，a1 <0; 和b1，b2，b3，...。。。是常数，b1> 0。

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