毫无疑问，拥有第二台显示器可以让您使用 PC 更加方便。对于工作和娱乐来说，没有什么比能够在您的第二个屏幕上保持社交媒体或Reddit更好的了 - 甚至在您工作时观看Netflix 。
但是，如果您周围没有第二台显示器怎么办？如果您有一台带HDMI输入的备用(HDMI)HDTV，您可以将其直接连接到您的计算机并像使用显示器一样使用它。
如果你已经这样做了，你可能会在这个过程中遇到一个令人沮丧的问题，但是请放心，你并不孤单。即使将电视机设置为正确的分辨率，您最终也可能会在电视屏幕上看到画面被截断。
臭名昭著的“过扫描”
这个问题有一个主要的罪魁祸首，它是许多电视(TVs)内置的一项功能，称为“过扫描”。如果您注意到屏幕的一部分被切断并且您无法访问您的任务栏或屏幕边缘，那么可以归咎于一种非常过时的技术。
如果我们回过头来谈谈早在LCD或等离子(Plasma)屏幕出现之前就已经存在的电视，那么内容创作者会遇到一个主要问题：缺乏标准化的设备，这几乎是不可能的。设计在所有屏幕上看起来都很棒的节目和电影。过扫描(Overscan)是解决方案，它会切断边缘，只真正显示被认为重要的屏幕部分。
Overscan是过去时代的遗物，不再需要，但令人讨厌的是，它仍然是许多HDTV(HDTVs)的一部分。在将屏幕设置为辅助显示器时，这可能会产生分辨率问题，因此让我们讨论如何解决问题并使您的电视成为最好的显示器。
固定电视分辨率：电视设置
很难给出如何在电视上禁用过扫描的具体指南，因为它会因品牌和型号而异。在大多数情况下，您会在“图片”菜单中寻找一个选项，该选项允许您调整纵横比，甚至完全禁用过扫描。
在大多数情况下，您的纵横比将设置为 16:9 分辨率。您需要将其更改为显示“ Screen Fit ”、“Just Scan”或类似内容的选项。如果您没有看到这些选项，您可能需要参考您的电视手册（或者只是尝试一些好的旧试验和错误）。您也可以只搜索(Google)您的电视品牌和型号以及“过扫描设置(overscan setting)”字样。
在某些情况下，尽管您尽了最大的努力，但您可能无法让图片正确显示。幸运的是，您可以在 Windows 和Mac设置中采取一些步骤，这些步骤可能会为您解决问题。
修复电视分辨率：Mac 设置
如果您使用的是Mac和/或使用Apple TV 等设备，您可以查看Apple 支持部门(Apple support)的这篇文章，该文章详细介绍了调整OS X和 tvOS 的过扫描或欠扫描的所有细节。
修复电视分辨率：Windows 设置
通过Windows(Windows)设置修复电视分辨率有点复杂，但使用以下步骤应该不会太难。请记住，本教程的重点是Nvidia 控制面板(Nvidia Control Panel)，但是那些运行Intel CPU(Intel CPUs)的人也应该不会有太大的困难。
然而，那些拥有AMD设备的人可能会有点失望，因为在他们的设置中并没有一个简单的过扫描修复方法。
因此，首先，右键单击您的桌面，然后单击 Nvidia 控制面板。( Nvidia Control Panel.)
应该会弹出一个窗口，左侧的菜单类似于下图。选择调整桌面大小和位置。(Adjust Desktop Size and Position.)
在菜单的右侧，您会看到一堆设置。单击(Click)第二台显示器（您的电视）并确保设置与我们设置的相似。请记住，您的分辨率和刷新率可能会因电视的品牌而异。
单击“大小(Size)”选项卡，将设置设置为与图像中的设置类似，然后单击“ 调整大小...”。( Resize….)
此时，应该会弹出一个屏幕，如下图所示。您只需拖动滑块，直到正确放置角指示器。这将调整显示器的分辨率（可能会偏离其原始分辨率），但如果您无法通过电视禁用过扫描，这是一个很好的后备方案。
我们希望此过程为您提供了启动HDTV并将其作为辅助监视器运行所需的所有工具。享受(Enjoy)简化您的工作流程，甚至在您工作或玩游戏时玩弄YouTube，因为您已经设法在使用电视时修复了分辨率。
Fix Resolution When Using Your HDTV as a Monitor
Therе’s no doubt that having a seсоnd monіtor can make using your PC much more conνenient. Fоr both work and play, there’s nothing better than bеing able to keep social media or Reddit up on your second screen – or even to watch Netflix while you work.
But what if you don’t have a second monitor lying around? If you have a spare HDTV lying around with an HDMI input, you can hook it right into your computer and use it like you would a monitor.
If you’ve done this, you may have run into a frustrating problem with this process, however, and rest assured you’re not alone. Even with the TV set to the correct resolution, you might end up with a picture that is cut off on your TV screen.
The Notorious “Overscan”
There’s one major culprit for this problem, and it’s a feature built into many TVs known as “overscan.” If you’re noticing that part of your screen is cut off and you can’t access your taskbar or the edges of your screen, there’s a pretty dated technology to blame.
If we go back in time for a moment to talk about TVs that were around long before the advent of LCD or Plasma screens, there was one main problem that content creators were running into: the lack of standardized equipment that made it near-impossible to design shows and movies that would look great on all screens. Overscan was the solution, and would cut off the edges and only really show the parts of the screen that were considered important.
Overscan is a relic of a bygone time that isn’t really needed anymore, but is annoyingly still part of many HDTVs. This can create resolution issues when setting up the screen to be used as a secondary display, so let’s discuss how to fix the issue and make your TV into the best monitor it can be.
Fixing TV Resolution: Television Settings
It’s difficult to give a specific guide for how to disable overscan on your TV, since it will vary pretty significantly by brand and model. In most cases, you’ll be looking for an option in the “Picture” menu that allows you to adjust aspect ratios or even just disable overscan outright.
In most cases, your aspect ratio will be set to something along the lines of a 16:9 resolution. You’ll want to change this to an option that says “Screen Fit,” “Just Scan,” or something like that. If you don’t see those options, you may want to refer to your TV manual (or just try some good old trial and error). You can also just Google your TV brand and model and the words “overscan setting“.
In some cases, despite your best efforts, you might have no luck getting the picture to show up correctly. Fortunately, there are some steps you can take in your Windows and Mac settings that might be able to fix the problem for you.
Fixing TV Resolution: Mac Settings
If you’re on a Mac and/or are using a device like an Apple TV, you can check out this article from Apple support that goes through all the details for adjusting overscan or underscan is OS X and tvOS.
Fixing TV Resolution: Windows Settings
Fixing TV resolution through Windows settings is a little bit more complicated, but shouldn’t be too difficult using the steps below. Keep in mind that this tutorial focuses on the Nvidia Control Panel, but those running Intel CPUs shouldn’t have too much difficulty following along either.
Those with AMD equipment may be a little disappointed, however, as there isn’t really an easy fix for overscan within their settings.
So, first off, right click on your desktop and click on Nvidia Control Panel.
A window should pop up with a menu on the left that looks similar to the one below. Select Adjust Desktop Size and Position.
On the right side of the menu, you’ll see a bunch of settings. Click on the second monitor (your TV) and make sure the settings look similar to what we have set. Just keep in mind that your resolution and refresh rate may be different depending on the make of your TV.
Click on the Size tab, set your settings similar to the ones within the image, and click on Resize….
At this point, a screen should pop up like the one below. You’ll simply drag the sliders untilt the corner indicators are placed correctly. This will adjust the resolution of your monitor (potentially away from its native resolution), but it’s an excellent fallback if you’re not able to disable overscan through your TV.
We hope this process has given you all the tools you need to get your HDTV up and running as a secondary monitor. Enjoy streamlining your workflow, or even goof off with YouTube while you’re working or gaming now that you’ve managed to fix resolution when using your TV.
