Wireless video transmission: Intel Widi technology fully revealed

　　Connect both ends of the HDMI cable to NETGEAR Push2TV and an external TV, turn on the power, adjust to HDMI input mode in the TV menu, and the relevant software configuration screen will pop up. At this time, the indicator light of the Push2TV adapter turns red, and the TV screen prompts Ready for connection, waiting for the laptop to connect to the adapter.

　　Waiting to connect to wireless device

　　Smooth playback of HD video test

　　After connecting to the adapter, the external monitor immediately shows the contents on the laptop. We selected a 1080P high-definition video file for transmission test and projected the laptop onto the external screen. The entire playback display was smooth without pauses. At the same time, it can also output audio signals, and the sound is synchronized with the playback screen without stagnation.

　　WiDi signal strength test

　　Since WiDi technology relies on wireless network transmission, if we place laptops in different locations in the office for connection, will the penetration ability of wireless signals affect the display effect of the TV? With doubts, we tested the signal strength of WiDi. The 4 simulated test points are shown in the figure above. After testing, we compared the signal strength of the 4 points and found that it is the same as the transmission principle of ordinary wireless routers. The signal is strongest within the range of straight-line transmission without any obstruction, and the signal strength will weaken as the distance becomes farther or there is an obstruction in the middle. After actual testing, the wireless display is normal within a radius of 6M, and the display is interrupted beyond this range.

　　Summary and Analysis

　　We connected the laptop to an external TV wirelessly, keeping the distance from the TV about 2 meters. The wireless signal was relatively strong. At this time, we ran a fighting game with high action picture requirements. As a result, a tragedy occurred. The content normally displayed on the laptop would lag behind the picture on the external TV by 1.5 seconds. Since the wireless transmission distance is very short, the influence of network signal strength can be ruled out. This also shows us that the young WiDi technology still exposes its immaturity.

　　There will be delays when playing games and performing complex operations

Is this the game replay mode?

　　We found that whether browsing the web, playing games or playing videos, the pictures will be out of sync. For game enthusiasts and users with high requirements for high-definition video display, WiDi technology is not currently the best solution. In business office applications, although WiDi technology has delays, it does not affect the playback of PPT presentations. After being equipped with such a WiDi device, it can be connected to the projector without any connection, and it also avoids the compatibility problem of the connection between the laptop and the projector.

　　Resolutions above 1366×768 are not currently supported

　　Advantages and Disadvantages Analysis

　　Intel's WiDi technology has indeed brought us a new wireless experience, and its advantages are also obvious: the display content of the notebook can be wirelessly transmitted to the TV and large-size monitor without any connection, and it also supports audio transmission, and no additional equipment is required on the notebook side. Disadvantages: The signal delay is relatively serious, the picture cannot be output synchronously, and it does not support full HD resolution, which affects the user's viewing experience. At present, there are not many wireless network cards that support WiDi technology, which also excludes many users' notebooks. The price of adapters that support WiDi technology is not easy for ordinary consumers to accept.

　　WiDi technology is still in the popularization stage. Although the threshold for implementation is high and the current price is relatively expensive, we still have reason to believe that through the continuous updating of technology, these problems should not be insurmountable. This technology has more development prospects in business office. If it can get the support of more projector and network manufacturers in the future, I believe that wireless display technology will bring more convenience to everyone.