Wireless Screen Projection – Introduction to the Advantages and Disadvantages of WiDi Wireless Screen Projection

Compared to most people, we have a certain understanding of the current mainstream screen projection protocols. The Miracast protocol based on Wi Fi Direct, developed by the Wi Fi Alliance, the Airplay protocol launched by Apple, the DLNA protocol and WiDi protocol, which are the most commonly used projection protocols in video software. Among them, the Miracast protocol mainly has the vast majority of user base, and the Airplay screen image is only used for iOS systems (Apple devices). DLNA is currently commonly used in video apps. Although we are not very familiar with the WiDi protocol, we actually have many applications.

WiDi (Wireless Home Digital Interface) supports high-definition transmission within a distance of 7-15 meters, consisting of a sender and receiver. The sender is connected to playback devices such as computers, laptops, Blu ray players, high-definition players, PS3, etc. The receiver can be connected to display devices such as large LCD screens, high-definition televisions, high-definition projectors, home theaters, or simply speakers.

The advantages of WiDi screen projection technology are as follows:

Uncompressed video delivery

The most fundamental difference between WiDi technology and other wireless technologies is that it can transmit fully high-definition audio and video streams without compression.

Transmission without delay

Due to the sufficient wireless bandwidth provided by WiDi technology, there is no need to transmit through compression, saving the time required for video compression and decompression, thus ensuring that the transmitted video has no delay at all.

Resolution up to 1080P

WiDi technology supports video resolution up to 1920X1080P. Subsequent software upgrades can support resolutions up to 2KX4K. Equivalent to 4 times 1080P.

Supports 7.1 channels

In addition to being able to transmit high-definition videos, WiDi technology can support 7.1 channel (PCM) audio transmission with a sampling rate of up to 24 bits and 192KHz.

100K backhaul channel

In addition to being able to transmit audio and video, WiDi technology also provides a 100K backhaul channel. The purpose of setting the backhaul channel is to enable mutual verification of the control protocol of HDCP between the transmitting and receiving ends.

Supports HDCP2.0 technology

The HDCP organization has separately set the technical standards for HDCP2.0 for WHDI technology. HDCP2.0 allows users to achieve one to many and many to many HDCP interactive authentication through WiDi technology. HDCP2.0 technology allows a video source with a content protection protocol to be displayed simultaneously on multiple display terminals. This is completely impossible to achieve in the HDMI 1.2 standard.

The Disadvantages of WiDi Technology

The disadvantage is that it lacks universality. If our mobile phones and computers do not support WiDi protocol, we cannot use it for screen mirroring, and most mobile phones and computers do not support WiDi, resulting in WiDI protocol not having a wide user base like Miracast screen mirroring technology. However, with the gradual maturity of wireless screen projectors and software, WiDi technology has also achieved good compatibility, and it is likely that it will be familiar to everyone in the future.