Product Information | Application of ST60 in Display Port Interface

DisplayPort (DP for short) is a digital video interface standard promoted by the Video Electronics Standards Association (VESA) and was formulated in May 2006. This interface is certification-free and license-free. It is mainly used to connect computers and displays, or computers and home theater systems. It is intended to replace the old VGA, DVI and LVDS video transmission interface technologies. DisplayPort is the first display connectivity interface to rely on packet data transmission technology, which can be found in technologies such as Ethernet, USB and PCI Express. It can be used for both internal and external display connections.

DisplayPort connectors can have 1, 2, or 4 differential data pairs on the main link, with bit rates of 1.62, 2.7, or 5.4 Gbit/s per channel. The data is 8b/10b encoded, that is, each 8-bit message is encoded into a 10-bit symbol. In addition to the main transmission channel, DisplayPort also provides a powerful AUX auxiliary channel. The transmission bandwidth of this auxiliary channel is generally 1Mbps, and the maximum delay is only 500μs. It can be directly used as a transmission channel for low-bandwidth data such as voice, and can also be used for delay-free game control. DisplayPort also has HPD channels for transmitting hot plug signals.

The digital interface of ST60A2 is SLVS (Scalable low voltage signaling) differential data pair. ST60A2 can directly transmit DisplayPort main channel video data without adding a conversion chip. ST60A3 can transmit eUSB2, GPIO, I2C, SPI, UART signals. For AUX and HPD signals, you need to use FPGA to aggregate these two low-speed signals and then transmit them to the GPIO port of ST60A3 for transmission. The reason for using FPGA is that the AUX signal has low latency requirements, and FPGA can meet the low latency requirements. The figure below is the schematic block diagram of the DisplayPort solution. This solution supports up to 4 main video channels, with a maximum data rate of 5.4Gbps per channel. Each main video channel uses a pair of ST60A2 chips to transmit data.

One application of the ST60/DisplayPort solution is for video transmission of a 2-in-1 tablet or extended screen. As shown in the figure below, place the ST60 module on the frame to transmit DisplayPort video.

In addition to transmitting DisplayPort signals, ST60 can also transmit MIPI-DPHY and HDMI video through the conversion chip. The following table is a summary of MIPI-DPHY and HDMI conversion chips.

MIPI D-PHY conversion chip

HDMI conversion chip

For more information about STMicroelectronics ST60, please visit: ST60 official website: https://www.st.com/zh/wireless-connectivity/60-ghz-contactless-products.html and ST60 Chinese forum