将您的计算机屏幕投影到辅助显示器甚至电视屏幕有很多好处。更大的屏幕画布允许用户通过同时显示更多的活动应用程序窗口来更有效地执行多任务，并改善媒体消费体验。早些时候，如果用户想要镜像他们的电脑屏幕，他们将需要一条笨重的HDMI电缆将他们的电脑或笔记本电脑与他们的电视连接起来，但随着智能电视(Smart TVs)成为每个家庭的一部分，HDMI电缆可以被抛弃。WiFi Alliance 的Miracast技术，被称为HDMI over WiFi，值得感谢。
Miracast顾名思义，是一种原生于Windows 10系统上的截屏技术，也被其他技术设备制造商采用，如谷歌(Google)、Roku、亚马逊(Amazon)、黑莓(Blackberry)等。该技术适用于Wi-Di协议，即, WiFi Direct省去了 wifi 路由器。使用Miracast，可以镜像 1080p 分辨率视频（H.264编解码器）并产生 5.1 环绕声。除了Windows之外，所有4.2 以上的Android版本都内置了对Miracast技术的支持。尽管Miracast消除了使用HDMI电缆的需要，它在功能方面落后于谷歌(Google)的Chromecast和苹果的Airplay。 尽管如此(Nevertheless)，对于大多数用户来说，Miracast无缝连接计算机和电视屏幕的基本功能还是可以解决问题的。
如何在Windows 10上设置和使用 Miracast(Use Miracast)？
#1. Check if your computer supports Miracast
大多数装有Windows 8.1和Windows 10的计算机都支持Miracast技术，但如果您从旧版本的操作系统（例如 Windows 7）升级，您可能需要确认其支持。有两种不同的方法可以检查您的计算机是否支持Miracast。
1.同时按下Windows键和 R启动运行命令(Run Command)框，键入dxdiag，然后单击确定以打开DirectX 诊断工具(DirectX Diagnostic Tool)。
2. 等待绿色栏完成加载，然后单击窗口底部的Save All Information...按钮。( Save All Information…)选择适当的位置来保存文件，并确保文件类型设置为文本。
3.在记事本中(Notepad)找到(Locate)并打开保存的.txt文件。Press Ctrl + F调出查找/搜索框并查找Miracast。
4. Miracast 条目将显示“Available”或“Available, with HDCP”(Miracast entry will read ‘Available’ or ‘Available, with HDCP’ )，这显然意味着您的计算机支持该技术。如果不支持，则该条目将显示为“图形(Graphics)驱动程序不支持”或只是“不可用”。
您还可以检查Windows 设置(Windows Settings)是否支持Miracast技术。打开显示设置(Open Display Settings)（在系统(System)设置下）并向下滚动右侧面板到多(Multiple)显示器部分。如果支持Miracast(Miracast)技术，您将看到“连接到无线显示器”( ‘Connect to a wireless display’)超链接。
很明显，如果您希望镜像屏幕，您的电视、投影仪或任何其他媒体控制台也需要支持该技术。要么阅读设备的官方文档，要么尝试在 WiFi Alliance 的网站上找到它，该网站维护着所有Miracast兼容设备的列表。目前，市场上有超过 10,000 台设备支持Miracast。此外，并非所有支持Miracast的设备都具有相同的品牌。例如，LG 的SmartShare、三星的AllShare Cast、索尼的Screen Mirroring、松下的Display Mirroring都基于Miracast技术。
如果您的电视不支持Miracast ，您可以购买支持(Miracast)Miracast的无线显示适配器并将其插入电视机。微软(Microsoft)自己以 50 美元的价格出售无线显示适配器(wireless display adapter)，但还有许多其他显示适配器价格更便宜。例如，亚马逊的Fire Stick和 AnyCast 的加密狗也允许用户镜像他们的电脑屏幕。
另请阅读：(Also Read:) 修复 5GHz WiFi 未显示在 Windows 10 中(Fix 5GHz WiFi not showing up in Windows 10)
#2. How to use Miracast to connect to an external screen?
使用Miracast镜像您的计算机屏幕是一项相当简单的任务。首先，确保两个设备（计算机和电视）都连接到同一个WiFi网络。成功连接两个设备后，您可以在各种显示配置之间进行选择以满足您的需求。
1. 按Windows键激活开始菜单，然后单击齿轮图标打开Windows 设置( Windows Settings)。相同的键盘快捷键是Windows键 + I。
2. 点击设备(Devices)。
3. 在蓝牙(Bluetooth)和其他设备页面，点击添加蓝牙或其他设备(Add Bluetooth or other devices)。
4. 在随后的添加(Add)设备窗口中，单击无线显示器或坞站(Wireless display or dock)。
5. 计算机将开始搜索其范围内的所有活动Miracast设备。(Miracast)只需在搜索结果中 click on your Miracast device/adapter即可建立连接并将您的计算机屏幕投影到另一个屏幕上。
6. 现在按Windows key + P打开显示切换器菜单并根据您的喜好配置两个屏幕。您也可以在连接两个设备之前执行此操作。
可供用户使用的四种不同配置是——仅 PC 屏幕或仅第二(Second)屏幕（这两个选项都非常易于解释）、复制（在两个屏幕上显示相同的内容）、扩展（在两个屏幕之间拆分应用程序窗口）。您还可以从显示切换器菜单本身连接到无线显示器。
#3. Troubleshooting tips for ‘Miracast Not Working’
用户在使用Miracast(Miracast)镜像他们的计算机屏幕时经常会遇到一些问题。通过定期更新显示器和WiFi(WiFi)（无线）适配器驱动程序，可以解决最常见的问题，例如未找到设备、不支持Miracast和连接问题。(Miracast)Driver Booster等应用程序 可用于此目的。有时，当内容正在使用Miracast显示在电视屏幕上时，计算机会继续播放音频。这可以通过更改声音设置中的播放设备来解决（Windows Settings > Sound > Playback并将Miracast TV 设置为默认设备）。
推荐： (Recommended: )在 Windows 10 中使用 Miracast 连接到无线显示器(Connect to a Wireless Display with Miracast in Windows 10)
我们希望本文对您有所帮助，并且您能够在 Windows 10 上设置和使用 Miracast。( Set up & Use Miracast on Windows 10.)但是，如果您在使用Miracast镜像屏幕时遇到任何其他问题，请在下面的评论中与我们联系。
How to Set up & Use Miracast on Windows 10?
Projecting yоur computer screen to a secondary monitor or even a TV screen has a lot of perks. A larger ѕcreen cаnvas allows users to multitask more efficiently by displaying a greater number of active applicаtion windows аt the sаme time and improves the media consumption exрerience. Earlier, if users wanted to mirror their compυter screen, they wоuld need a clunky HDMI cable to connect their computers or laptops with their TV but with Smart TVs becoming a part of еvery houѕеhold, the HDMI cables can be ditched. WiFi Alliance’s Miracast technology, dubbed as HDMI over WiFi, is to be thanked for this.
Miracast, as the name suggests, is a screencasting technology that is natively found on Windows 10 systems and has also been adopted by other tech device manufacturers like Google, Roku, Amazon, Blackberry, etc. The technology works on Wi-Di protocol, i.e., WiFi Direct eliminating the need for a wifi router. Using Miracast, one can mirror 1080p resolution videos (H.264 codec) and produce 5.1 surround sound. Apart from Windows, all Android versions above 4.2 have built-in support for Miracast technology. While Miracast has eliminated the need of messing with HDMI cables, it trails behind Google’s Chromecast and Apple’s Airplay in terms of features. Nevertheless, for most users, Miracast’s basic ability to connect computers and TV screens seamlessly does the trick.
How to Set up & Use Miracast on Windows 10?
#1. Check if your computer supports Miracast
Most computers with Windows 8.1 and Windows 10 support Miracast technology, although if you upgraded from an older version of the OS, say Windows 7, you might want to confirm its support. There are two different ways to check if your computer supports Miracast.
1. Launch the Run Command box by simultaneously pressing the Windows key and R, type dxdiag, and click on OK to open the DirectX Diagnostic Tool.
2. Wait for the green bar to complete loading and click on the Save All Information… button present at the bottom of the window. Choose an appropriate location to save the file at and also ensure the file type is set as text.
3. Locate and open the saved .txt file in Notepad. Press Ctrl + F to bring forth the find/search box and look for Miracast.
4. The Miracast entry will read ‘Available’ or ‘Available, with HDCP’ which, as obvious, implies that your computer supports the technology. If it doesn’t, the entry would read ‘Not Supported by Graphics driver’ or simply ‘Not Available ’.
You can also check if Miracast technology is supported by Windows Settings. Open Display Settings (under System settings) and scroll down the right panel to the Multiple displays section. You will see a ‘Connect to a wireless display’ hyperlink if Miracast technology is supported.
As obvious, your TV, projector, or any other media console also needs to support the technology if you wish to mirror screens. Either read the device’s official documentation or try to locate it on WiFi Alliance’s website which maintains a list of all Miracast compatible devices. Currently, over 10,000 devices in the market have Miracast support. Also, not all Miracast enabled devices to bear the same branding. For example, LG’s SmartShare, Samsung’s AllShare Cast, Sony’s Screen Mirroring, and Panasonic’s Display Mirroring are all based on Miracast technology.
If your TV doesn’t support Miracast, you can instead purchase a wireless display adapter with Miracast support and plug it into the TV set. Microsoft themselves sell a wireless display adapter for 50 dollars, but there are plenty of other display adapters available with a cheaper price tag. For example, Amazon’s Fire Stick and AnyCast’s dongles also allow users to mirror their computer screens.
Also Read: Fix 5GHz WiFi not showing up in Windows 10
#2. How to use Miracast to connect to an external screen?
Using Miracast to mirror your computer screen is a fairly easy task. Firstly, ensure both the devices (computer and TV) are connected to the same WiFi network. Once you manage to connect both devices, you can choose between various display configurations to suit your needs.
1. Activate the start menu by pressing the Windows key and click on the cogwheel icon to open Windows Settings. The keyboard shortcut for the same is Windows key + I.
2. Click on Devices.
3. On the Bluetooth and other devices page, click on Add Bluetooth or other devices.
4. In the ensuing Add a device window, click on Wireless display or dock.
5. The computer will start searching for any active Miracast devices within its range. Simply click on your Miracast device/adapter in the search results to establish a connection and project your computer screen on another screen.
6. Now press Windows key + P to open the display switcher menu and configure the two screens according to your preference. You can also do this before connecting the two devices.
The four different configurations available to users are – PC screen only or Second screen only (both options are pretty explanatory), duplicate (display the same content on both screens), extend (split up the application windows between the two screens). You can also connect to a wireless display from the display switcher menu itself.
#3. Troubleshooting tips for ‘Miracast Not Working’
Users often run into a few issues when using Miracast to mirror their computer screen. The most common issues like device not found, Miracast not supported and trouble connecting can be resolved by regularly updating the display and WiFi (wireless) adapter drivers. Applications such as Driver Booster can be used for this purpose. Sometimes, the computer continues to play audio while the content is being displayed on the TV screen using Miracast. This can be resolved by changing the playback device in sound settings (Windows Settings > Sound > Playback and set the Miracast TV as the default device).
Recommended: Connect to a Wireless Display with Miracast in Windows 10
We hope this article was helpful and you were able to Set up & Use Miracast on Windows 10. But if you are facing any other issues in using Miracast to mirror your screen, connect with us in the comments below.
