发明名称 |
Graphics display terminal and method of storing alphanumeric data therein |
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 nxm 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.
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申请公布号 |
US4757309(A) |
申请公布日期 |
1988.07.12 |
申请号 |
US19850748259 |
申请日期 |
1985.06.24 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
BOWATER, RONALD J.;DAVIS, MICHAEL I.;FARR, ROBERT W. E.;POWELL, COLIN V. |
分类号 |
G06G7/163;G09G5/06;(IPC1-7):G09G1/28 |
主分类号 |
G06G7/163 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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