NVIDIA VCQFX550PCIEPB User Guide - Page 85

Chapter 6 Configuring HDTV Underscan The Underscan setting (Figure 6.9) works by centering a lower resolution on the HDTV screen, the dimensions of which you can further adjust with sliders in the current release of the driver, as shown in Figure 6.10. For component out, NVIDIA determined through market research that 15% overscan is common with many TVs (both SDTV and HDTV). NVIDIA used this information to create two custom resolutions that are optimal for Web browsing, running applications, and playing games on HDTV sets. These resolutions are: • 720p: 1088 x 612 (85% of the full 1280x720.) • 1080i: 1600 x 900 (1632 x 918 is 85% of the full 1920x1080, but that is so close to 1600x900 that 1600 x 900 is used instead.) "Using Underscan" on page 94 explains how to use the Underscan setting. Overscan Shift The Overscan shift setting (Figure 6.7) enables you to pan the desktop, when needed, to access any display elements that appear off-screen. The Overscan shift feature works by tracking the position of the mouse cursor and slightly shifting the display when the cursor starts to become close to an edge of the desktop. This mode looks just like "native" HDTV formats (720p, 1080i) because it runs at the full HDTV resolution, which causes certain elements of the desktop, such as the Start button and the clock on the Windows taskbar, to not be visible at all times. But as the mouse cursor gets close to these desktop elements, the NVIDIA driver intelligently shifts the desktop a little in order to move those elements into view. "Using Overscan Shift" on page 92 explains how to use the Overscan shift setting. Native In the third technique, native mode, no overscan compensation is done in order to give the user a true cinematic experience. This is useful when you do not want any pixel compression (squishing) and do not want to use the mouse to shift the desktop image. NVIDIA Corporation 85