HDMI to DisplayPort and DisplayPort to HDMI Conversion Explained

Have you ever tried to connect a DisplayPort cable in your conference or discipline room to your display or projector through a DisplayPort mesa jack and it won ’ deoxythymidine monophosphate work ? What if the only available port on your display is DisplayPort, and your calculator is HDMI – will that work ? To avoid frustration, we must cautiously consider DisplayPort signal way conversion early on, during AV system design.

An exemplar of a relatively elementary AV system could include : A display on the wall with only HDMI inputs, and a wall-plate immediately below that has HDMI and DisplayPort jacks that connect to the HDMI inputs on the display. A exploiter connects to the wall-plate using DisplayPort, selects the chastise Input on the display, and they are away and running – correct ? not so fast ; there needs to be a conversion from DisplayPort to HDMI somewhere, and if that converter is not in the right rate it will not work. This frequently causes frustration and misplaced blame. You might think why not just put that converter behind the display, right at the HDMI stimulation larboard so the user does not see it or behind the wall-plate, but you would be wrong. You should not use an adapter to convert DisplayPort to HDMI anywhere in the signal chain other than right at the source. here ’ south why :

  • The DisplayPort provides 3.3v DC office on personal identification number 20. Most DisplayPort cables do not have this trap ( or it is not connected inside the cable ) because it will cause a short-circuit when connecting beginning to sink .
  • DisplayPort natively outputs in a LVDS sign type that is not compatible with HDMI ( HDMI uses TMDS ). It does have a dual-mode version that will support TMDS in compatibility manner .


  • DisplayPort signals operate at 3.3v, even when using TMDS in compatibility mode. HDMI TMDS signals operate at 5v .
  • An external arranger allows a dual-mode DisplayPort output signal to send TMDS signal, and besides bumps the electric potential up to the standard HDMI 5v .
  • These adapters are powered by pin 20 in the DisplayPort receptacle, and can alone be used right at the informant device – if they are used with a DisplayPort cable in battlefront of them, the signal does not get converted because no office is available on the DisplayPort cable pin 20 .
  • This type of DisplayPort to HDMI arranger is one-way lone and MUST be used at the DisplayPort reservoir receptacle .

You cannot use the above adapter in reverse – to adapt an HDMI signal to a monitor’s DisplayPort receptacle even though the gender is a perfect match. A different type of adapter must be used when going from HDMI to DisplayPort :file

  • The HDMI specification does not support the DisplayPort LVDS signal type, and if the HDMI TMDS is plugged into a DP monitor, it will not work .
  • The DisplayPort receptacle on a admonisher or display will alone accept the LVDS 3.3v DisplayPort signal type.
  • A different active arranger that converts the HDMI TMDS signal at 5v to DisplayPort LVDS at 3.3v is required .
  • This conversion process uses more current than the ability pin on the receptacle can provide and must be an externally powered arranger .

The DisplayPort and HDMI device receptacles both provide limited ability on a single peg to power some external devices such as adapters, converters, active cables, and basic switches. A wall-plate, mend cable television, or table cubby jack breaks this might signal chain. You can not use an HDMI cable with built-in extender in most situations because they draw ability from the missing bowling pin. The HDMI stipulation for generator and sink devices provides 5v power on pin 18. DisplayPort specification is 3.3v on pin 20. Most cables do not have this trap – it is missing. And if it wasn ’ deoxythymidine monophosphate, it could result in a short. Look at any reputable HDMI or DisplayPort cable and visualize for yourself – there is either no contact on one of the corner pins or that pivot is not electrically connected. file damage can occur to the connected devices if this pin is electrically connected and some of the off-brand cables do merely that. Any time a reputable temporary hookup cable is used in the signal path this exponent association is broken as it should be. If you need help resolving connectivity issues in your suffer spaces, reach Tempest Technologies, LLC nowadays for a solution.

# fundamentals # Quality # AudioVideo # Video # AV # AV # technology # AudioVisual # Presentation # HDMI # DisplayPort # SignalPath # Connectivity # Adapter # Cables

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