More and more users are replacing the notebook with a tablet for mobile professional use, because it is more practical, more flexible and more stylish. There are problems when you want to throw a presentation on the wall using a beam.
Mobile Cinema i55 for the iPhone 5
Often, the tablet is missing the correct connectors to send the display content to the beamer. There are different strategies to circumvent this shortcoming. First: attachments for the smartphone or tablet turn the device into a mobile beamer. This makes the connection to stationary projector or TV screen unnecessary. Disadvantage: Most plug-on attachments offer only a low resolution and are not very light. If your presentation is held in a bright office, your viewers can guess more than read what you want to show them.
Miracast: Smartphone to beamer
The light intensity is 25-50 ANSI lumens - depending on the manufacturer and model. For example, Aiptek has several mini-projectors on offer. They are plugged into the smartphone or connected to a suitable adapter cable. The beamer then throws the contents of the smartphone to the next wall.
The little black
With the Mobile Cinema i55 for the iPhone 5 and 5S, for example, you can project an image up to 150 cm in size from two to three meters away. Optimal is 120 centimeters of image diagonal, as our test has shown. Make the image bigger, it will be out of focus.
Chromecast: Everything from the cloud
For the projection slide the iPhone into the projector device, via the Apple Lightning adapter the data from the iPhone to the beamer. With 50 ANSI lumens, however, MobileCinema i55 is not very bright. The best way to display this is when the room is dark or very light is lit.
The contrast ratio of the mini-projector is 1000: 1, the resolution is 640x480 pixels. The low resolution is fine for simple PowerPoint presentations. Anyone who has incorporated films into his lecture will not be too happy about the resolution. In addition, your iPhone or tablet is "tied" on the table with a cable attached to the beamer - so you can not walk around freely in the room. You must be next to your smartphone.
The rechargeable battery, which is integrated into the plug-in attachment, delivers the power for the plug-in beamer - in the test we achieved a projection time of almost 1.5 hours. At the same time, the battery can also be used to charge the iPhone The mobile phone i55 for iPhone 5 is not quite cheap with 249 Euro UVP - especially as around 30 Euro for the Apple Lightning digital AV adapter.
In addition, the iPad 4 and the iPad mini can be connected. With an MHL and an HDMI cable, the beamer intended for the iPone can even be operated with an Android smartphone. However, it does not look so smart. For the iPhone 4 and the iPhone 4S, iPad, iPad 2 and the iPad 3, the Aiptek MobileCinema i50D is the right plug-in attachment. However, there are only remaining stocks in the market, this model is not produced any further.
Strategy number two: You want to connect your smartphone or tablet to a beamer. There are two possibilities. First: connect via WiDi or Miracast. Second, connect via the HDMI port connected to the projector.
Miracast is a cross-company standard for Android devices that allows you to transfer presentations, videos, and images from your smartphone and tablet to a TV screen or projector, without the need for a wireless router.
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The connection is via WiFi direct. From Android 4.2, Miracast is available as standard in all Android smartphones. In addition, the beamer and your smartphone or tablet from which you want to present also need to support WiFi direct. Miracast theoretically allows all content to be transferred to a suitable TV or beamer in full HD. In practice, however, not too many tablets have been certified for Miracast. For the Lenovo Yoga Tablet, for example, there should be a USB dongle that supports Miracast.
At Samsung, there are three tablets that are dominated by Miracast: the Galaxy Note 10.1 (WiFi, 3G, LTE), the Galaxy Tab 3 8.0 (WiFi, 3G, LTE) and the Galaxy Note 10.1 2017 Edition (WiFi, 3G). The technology is still young and it is expected that Miracast will soon be the standard tablet device - similar to Bluetooth or WLAN.
Sony recently unveiled the IM10 Miracast Wireless Display. This allows the display screens of Android devices to be transmitted wirelessly to a TV. The small device costs about 80 euros and is connected via HDMI to a TV and paired with the smartphone or tablet using NFC.
Conclusion
The transmission runs over the integrated WLAN of the two devices and can process image signals up to 1080p. Compatible is IM10 Miracast Wireless Display with all Miracast smartphones and tablets. So you are not limited to hardware from the house of Sony. From Netgear, there is an HD TV adapter for PC and tablet for approximately 60 euros, which also displays content such as movies, photos, music, presentations and websites on your large screen television.
Google's Chromecast also follows the idea of sending pictures from the tablet to a large TV screen. The small HDMI stick runs under a stripped-down version of Google TV, which is based on Android (but currently not officially available in the United States).
To connect the tablet or smartphone, the stick must be plugged into a free HDMI port on the TV. However, Chromecast does not mirror the contents of the tablet and smartphone like Miracast, but calls content from the cloud.
You can only send YouTube videos or web pages to the large screen from your tablet or smartphone via Chrome browser. Therefore, if you did not call your Powerpoint presentation via a URL, but save it as a ppt file on your device, Chromecast will not help you.
This is a pity, because Chromecast is also compatible with still widely used older TV sets, which have neither a network connection nor over WLAN. The Apple world can use Apple TV to present content from iPhone and iPad. Apple TV is a small black box that is connected to the beamer or TV via HDMI. Apple TV then communicates with the iPad via a WLAN hotspot.
As a hotspot, you can get your iPhone or a mini router to take away, for example from Huawei. As soon as you activate the WLAN hotspot, the black box automatically connects to the WLAN. On the iPad, the option to duplicate the screen appears on an Airplay device. The presentation can begin.
It is already possible today to leave the notebook at home and play a presentation from the tablet or smartphone. However, you should always have an MHL and an HDMI cable in your pocket. Because not every projector offers all connections. And a standard technology for the connection of mobile devices is just starting to establish itself.
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