Editing Transition-minimized differential signaling (section)

== Description ==
TMDS was developed by [[Silicon Image Inc.]] as a member of the [[Digital Display Working Group]].

TMDS is similar to [[low-voltage differential signaling]] (LVDS) in that it uses [[differential signaling]] to reduce [[electromagnetic interference]] (EMI) which allows faster signal transfers with increased accuracy. TMDS also uses a [[twisted pair]] for noise reduction, rather than [[coaxial cable|coaxial cables]] which are conventional for carrying video signals. Like LVDS, the data is transmitted serially over the data link. When transmitting video data and used in HDMI, three TMDS twisted pairs are used to transfer video data. Each of the three links corresponds to a different [[RGB]] component.

The physical layer for TMDS is [[current mode logic]] (CML),<ref>[http://www.ti.com/lit/ds/symlink/ds34rt5110.pdf DS34RT5110 DVI, HDMI Retimer with Input Equalization and Output De-Emphasis]</ref> [[DC coupling|DC coupled]] and [[Electrical termination|terminated]] to 3.3 Volts. While the data is DC balanced (by the encoding algorithm), DC coupling is part of the specification. TMDS can be switched or repeated by any method applicable to CML signals. However, if DC coupling to the transmitter is not preserved, some transmitters' "monitor detection" features may not work properly.