| 摘要 |
<p>An on-screen display system using scan line memories. Complex on-screen display, comprising multiple layers of on-screen display, is achieved using a pixel memory having a maximum capacity of two horizontal lines of display data. Compressed display data (e.g. character, icon, etc.) is read from RAM and expanded into pixel registers. Pixel data from the pixel registers is forwarded to pixel memory for on-screen display. The pixel memory is also written back into one of the pixel registers and the pixel registers are overlaid to form complex on-screen display data.</p> |
