DP does not require buffering the entire frame. Data is sent as "micro packets". Each micro packet may include a maximum of 64 link symbols, and each link symbo

DP does not require buffering the entire frame. Data is sent as "micro packets". Each micro packet may include a maximum of 64 link symbols, and each link symbol is made up of 8 bits encoded as 8b/10b. The slowest supported link symbol clock is 1.62Gb/s, so even considering protocol overhead there are always millions of micro packets per second. If the required video data rate is lower than the link symbol rate the micro packets are stuffed with dummy data to make up the difference, and up to four micro packets may be sent in parallel over separate lanes, so some buffering is required, but this need only add a few microseconds of latency, which is not perceptible. Of course it's possible for bad implementations to add more, but the protocol was designed to support low latency.