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1. 发明授权

US5406306A System for, and method of displaying information from a graphics memory and a video memory on a display monitor 失效
标题翻译：用于在显示监视器上从图形存储器和视频存储器显示信息的系统和方法
公开(公告)号：US5406306A
公开(公告)日：1995-04-11
申请号：US14359
申请日：1993-02-05
申请人： Jonathan I. Siann , Conrad M. Coffey , Jeffrey L. Easley
发明人： Jonathan I. Siann , Conrad M. Coffey , Jeffrey L. Easley
IPC分类号： G06F3/14 , G06F3/048 , G06F3/153 , G09G5/00 , G09G5/02 , G09G5/14 , G09G5/395 , H04N5/272 , G09G1/14
CPC分类号： H04N5/272 , G09G5/02 , G09G5/395 , G09G2340/12 , G09G2340/125
摘要： A display memory respectively stores, in first and second portions, digital graphics data for display in a video monitor and digital video data for display in a window in the monitor. The digital video data is transferred from the display memory to a shift register at a rate different from the pixel clock and from the shift register at a clock rate that may be lower than the pixel clock rate. The video data may be stored in a luminance and chrominance format and may be converted by a color space converter to 3 bytes representing the primary colors red, green and blue. The video pixels may then be interpolated to expand the number of video pixels. The shift register operation may be synchronized with such expansion so that data is not passed from the shift register until the expansion of previous data from the shift register has been completed. Video window logic provides for the passage of the graphics pixels through a digital multiplexer at the graphics clock rate at the monitor positions outside the window and the video pixels from the shift register through the colorspace converter and the interpolator at the monitor positions within the window. The graphics data may be delayed by a delay corresponding to that of the color space converter and the interpolator. The digital data passing through the multiplexer are latched at the graphics clock rate and are then converted to analog signals for display as a color image on the video monitor.
摘要翻译：显示存储器分别在第一和第二部分存储用于在视频监视器中显示的数字图形数据和用于在监视器中的窗口中显示的数字视频数据。数字视频数据以与像素时钟速率不同的时钟速率从像素时钟和移位寄存器以不同于时钟速率的速率从显示存储器传送到移位寄存器。视频数据可以以亮度和色度格式存储，并且可以由颜色空间转换器转换成表示原色红，绿和蓝的3字节。然后可以内插视频像素以扩大视频像素的数量。移位寄存器操作可以与这种扩展同步，使得数据不会从移位寄存器传递，直到来自移位寄存器的先前数据的扩展已经完成。视频窗口逻辑提供图形像素通过数字多路复用器，其以窗口外的监视器位置处的图形时钟速率和来自移位寄存器的视频像素通过颜色空间转换器和窗口内的监视器位置处的内插器通过。图形数据可以被延迟与颜色空间转换器和内插器的延迟相对应的延迟。通过多路复用器的数字数据以图形时钟速率锁存，然后转换为模拟信号，以便在视频监视器上显示为彩色图像。

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