DVI and HDMI are in some parts patented by Silicon Image, the same company that produced (patented) SATA. So licensing fees are involved in all of these. HDMI is however latest, most sold to consumers (has highest recognition among non technical consumers), and as such demands bigger licensing fees.
DisplayPort on the other hand is license free!!! It comes built into the latest Intel chipsets (at least ones with built in graphics). So it has cost advantage as well as size, being ever so slightly smaller then HDMI. Another advantage is that it was designed to be a... jack of all trades. It can quite easily be converted to most other signals with a dongle.
Problem with DisplayPort is that until monitor/tv manufacturers release new DisplayPort products (Dell will have a line available first half of next year), the solution looks damn ugly by having to carry an ugly dongle hanging off your laptop.
I am not sure which port will be prominent in the future. HDMI has nice user base already. But DisplayPort comes at no cost with new chipsets, so price will drive it...
Miki.
Thanks for the info. I know I read somewhere there was some reason why HDMI was being used instead of DisplayPort, but I can't find it now tho, so maybe I misremember.
Wikipedia has this info on DisplayPort. If this is true, why wouldn't everybody be using it? Bold added by me:
"Advantages over DVI
1. Based on micro-packet protocol
* Allows easy expansion of the standard
* Allows
multiple video streams over single physical connection (in a future version)
2. Designed to support internal chip-to-chip communication
* Can drive display panels directly, eliminating control circuits and allowing for cheaper and slimmer displays
* Aimed to replace internal LVDS links in notebook panels with a unified link interface
3. Dual-mode DisplayPort is capable of
backward compatibility with single link DVI/HDMI (active converter adapters or dongles are required for dual link DVI/HDMI and analog VGA)
4. Supports both RGB and YCbCr color spaces (ITU-R BT.601 and BT.709 format)
5. Auxiliary channel can be used for
touch-panel data, USB links, camera, microphone, etc.
6. Fewer lanes with embedded clock reduce RFI
7. Slimmer cables and a much
smaller connector that doesn't require thumbscrews. Connector pins don't run the risk of bending if improperly handled
8. The DisplayPort connector is easier to connect guided only by touch"
Smaller connector - touch panel compatible - backwards compatible with an adapter - Apple should love all this. They sure don't mind making you use an adapter to connect to external monitors.