Industry News

The differences between HDMI and DisplayPort

2021-04-06

The HDMI Cable and DisplayPort Cable run on the same basic structure and differential coaxial twisted pair, and both use high-speed and low-voltage differential signals to transmit data, but that's the only similarity between the two.

 

Although the two standards are very similar in appearance, there are huge differences in structure. These differences determine the performance of the link and its cost, compatibility, robustness, and ease of execution.

 

The HDMI cables standard now defines four connectors, A to D. Except for Type B, the rest are 19 pins. Type C and D are aimed at portable applications and small-volume devices. The cables used by the two standards are slightly different.

 

HDMI cables 1.0 to 1.3 use 4 shielded coaxial differential pairs, 4 single-ended control signals, power (+5V) and ground wires. HDMI cables 1.4 adds audio return channel and Ethernet channel, so the signal structure is different. HDMI1.4 uses 4 coaxial pairs, 1 unshielded differential pair, 3 single-ended signals, power supply (+5V) and ground.

This means that HDMI data cable 1.4 and HDMI data cable 1.3 use different cables. If a non-HDMI1.4 cable is used in the HDMI1.4 system, the audio return and Ethernet functions will be lost. However, all the features of HDMI1.3 and other new features of HDMI1.4 (such as 3D) can be retained.

DisplayPort defines two types of connectors, Full Size and Mini. Both connectors have 20 pins, but the width of the mini connector is about half of the full size, and their dimensions are 7.5mm x 4.5mm and 16mm x 4.8mm, respectively. To establish a complete link requires 5 coaxial pairs, 3 single-ended signals, and power and ground wires.

 

Mini DP interface

 

The scalability of DisplayPort Cable itself allows a low-bandwidth DisplayPort link to be established with fewer wires, but few people do this because it may cause confusing compatibility issues for end users.

The above is the difference between the HDMI high-definition cable signal and the DisplayPort cable signal introduced by the technical staff of Edson. Although the HDMI data cable and DisplayPort seem to have the same function, they are also high-speed digital serial links, but in terms of structure, they It's completely different.