78 User’s GuideChapter 6Configuring HDTVTable 6.3 Optimizing HDTV ViewingUnderscanThe Underscan setting (Figure 6.7) works by centering a lower resolution on theHDTV screen, the dimensions of which you can further adjust with sliders in thecurrent release of the driver, as shown in Figure 6.10, “Underscan Screen ResolutionAdjustment Sliders” on page 89.For component out, NVIDIA determined through market research that 15% overscanis common with many TVs (both SDTV and HDTV). NVIDIA used this informationto create two custom resolutions that are optimal for Web browsing, runningapplications, 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 to1600x900 that 1600 x 900 is used instead.)“Using Underscan” on page 88 explains how to use the Underscan setting.User taskRecommendedCorrectiveMethod ReasonsWatch movies Native Underscan correction always reduces the quality of the video beingwatched since it changes the size of the native video resolution bycompressing the size of the pixels.In addition, sometimes there is additional electronic informationrecorded in the invisible portions of the video stream. This is notsupposed to be seen directly by the user, as it can be very distracting.Underscan or overscan shift would cause this information to nowbecome visible.• Browse the Web• Run WindowsapplicationsOverscan shiftUnderscanBrowsing the web requires that the end user see all information in thebrowser window. Either of these modes will allow the users accomplishthis and provide the best web viewing experience.Play full-screengames Underscan If the application correctly queries the graphics driver and requests themodes it supports, you will be able to play the game in the correctedunderscan mode and see all of the information on your display.However, some games do not query the graphics driver. Instead,these games hard code the resolutions supported in the game directlyinto their code. Therefore you can use an alternative way to correctthe resolution, such as checking the display for correction options.
