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1. 发明授权

US4757309A Graphics display terminal and method of storing alphanumeric data therein 失效
标题翻译：图形显示终端及其中存储字母数字数据的方法
公开(公告)号：US4757309A
公开(公告)日：1988-07-12
申请号：US748259
申请日：1985-06-24
申请人： Ronald J. Bowater , Michael I. Davis , Robert W. E. Farr , Colin V. Powell
发明人： Ronald J. Bowater , Michael I. Davis , Robert W. E. Farr , Colin V. Powell
IPC分类号： G06G7/163 , G09G5/06 , G09G1/28
CPC分类号： G09G5/06
摘要： The specification describes a method of storing alphanumeric characters in a graphics display terminal comprising a raster-scan display device and a refresh buffer including a plurality of bit planes each having a respective bit storage location corresponding to each addressable pel position on the screen of the display device. In the method, a first bit plane stores high resolution luminance data defining alphanumeric characters each as a selection of "on" bits within a respective n.times.m array where n is the width of the character box in the scan line direction, and at least one further bit plane stores low resolution color data for the characters. The attribute plane comprises a respective n-bit set of storage locations which corresponds to each n-bit wide by one pel deep portion of a character box in the luminance plane and defines at least the color and/or intensity of the foreground and background of the character for the width of the character box in respect of a single scan line. The specification also describes a graphics display terminal in which data in the luminance and attribute planes may be selectively decoded either as alphanumeric data stored as above, or as bit-mapped graphics data.
摘要翻译：本说明书描述了一种在图形显示终端中存储字母数字字符的方法，包括光栅扫描显示装置和包括多个位平面的刷新缓冲器，每个位平面具有对应于显示器屏幕上的每个可寻址像素位置的相应位存储位置设备。在该方法中，第一位平面存储定义字母数字字符的高分辨率亮度数据，每个字符数字字符作为在相应的nxm阵列内的“开”位的选择，其中n是扫描线方向上的字符框的宽度，并且至少另外一个位平面存储字符的低分辨率颜色数据。属性平面包括对应于亮度平面中的字符箱的每个n位宽乘以一个像素深部分的相应的n位存储位置集，并且至少定义了前景和背景的颜色和/或强度相对于单个扫描线的字符框宽度的字符。本说明书还描述了一种图形显示终端，其中亮度和属性平面中的数据可以被选择性地解码为如上所述存储的字母数字数据，或者作为位映射图形数据。

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