WiDi (WirelessHomeDigitalInterface, or wireless home digital interface) WiDI supports high-definition transmission within 7-15 meters. It is composed of a transmitter and a receiver. The transmitter is connected to playback devices such as computers, laptops, Blu ray players, high-definition players, PS3, etc., and the receiver is connected to display devices such as large screen LCD, high-definition television, high-definition projectors, home theaters, or simple speakers.
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. There are two main ways to transmit video wirelessly: one is to wirelessly transmit compressed audio and video streams at the transmitting end, and the other is to decompress and restore images at the receiving end, represented by WIFI and UWB technologies. Another method is to directly transmit the video frequency stream output from the video source to the receiving end through wireless means, and output images, represented by WiDi. Only WiDi technology can be implemented in the industry.
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 shadow videos have no delay at all.
WiDi technology supports video resolution up to 1920X1080P. Subsequent software upgrades can support resolutions up to 2KX4K. Equivalent to 4 times 1080P.
In addition to being able to transmit full HD video, WiDi technology can support 7.1 channel (PCM) audio transmission with a sampling rate of up to 24bit and 192KHz.
In addition to being able to transmit audio and video, WiDi technology also provides a 100K return channel. The purpose of setting the return channel is to enable the control protocol of HDCP to mutually verify between the transmitting and receiving ends. At present, domestic WiDi module manufacturer Shimeng Company has achieved the USB keyboard and mouse backhaul function through this channel, namely UWTC (USB Wireless Transmission Control) technology, and has mastered the remote control technology of multi touch.
The HDCP organization has separately set the technical standards for HDCP2.0 for WiDi 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.