| Type | Digital video connector | ||
|---|---|---|---|
| Production history | |||
| Designed | 2006 (Abandoned 2007) | ||
| Produced | None | ||
| Superseded | HDMI | ||
| Superseded by | DisplayPort | ||
| General specifications | |||
| Length | 10.7 mm (0.42 in) | ||
| Width | 17.3 mm (0.68 in) | ||
| Height | 3.7 mm (0.15 in) | ||
| Hot pluggable | Yes | ||
| External | Yes | ||
| Audio signal | No | ||
| Video signal | Yes | ||
| Pins |
| ||
| Electrical | |||
| Max. voltage | +5V | ||
| Max. current | 0.5 A | ||
| Data | |||
| Data signal | R,G,B data + clock and display data channel (TMDS) | ||
| Width | 36 bit (maximum) | ||
| Bitrate | 16 Gbit/s | ||
| Pinout | |||
 | |||
| External UDI receptacles for the (R)eceiver [display] and (T)ransmitter [computer] | |||
| Pin 1 | Reserved connector pin. No cable connection | (NC) | |
| Pin 2 | Reserved connector pin. No cable connection | (NC) | |
| Pin 3 | Reserved connector pin. No cable connection | (NC) | |
| Pin 4 | Shield for UDI_Data2[+/-] | GND | |
| Pin 5 | Positive side of UDI lane 2 data | UDI_Data2+ | |
| Pin 6 | Negative side of UDI lane 2 data | UDI_Data2- | |
| Pin 7 | Shield for UDI_Data1[+/-] | GND | |
| Pin 8 | Positive side of UDI lane 1 data | UDI_Data1+ | |
| Pin 9 | Negative side of UDI lane 1 data | UDI_Data1- | |
| Pin 10 | Shield for UDI_Data0[+/-] | GND | |
| Pin 11 | Positive side of UDI lane 0 data | UDI_Data0+ | |
| Pin 12 | Negative side of UDI lane 0 data | UDI_Data0- | |
| Pin 13 | Shield for UDI_Clk[+/-] | GND | |
| Pin 14 | Positive side of UDI differential reference clock | UDI_Clk+ | |
| Pin 15 | Negative side of UDI differential reference clock | UDI_Clk- | |
| Pin 16 | Discrete ground wire | GND | |
| Pin 17 | Consumer Electronics Control (optional) | CEC | |
| Pin 18 | UDI auxiliary power | UDI_APwr | |
| Pin 19 | UDI control clock | UDI_CtrlClk | |
| Pin 20 | UDI control data | UDI_CtrlData | |
| Pin 21 | Supply voltage for control link signals | UDI_EPwr | |
| Pin 22 | UDI link hot-plug detect | UDI_HPD | |
Unified Display Interface (UDI) was a digital video interface specification released in 2006 which was based on Digital Visual Interface (DVI). It was intended to be a lower cost implementation while providing compatibility with existing High-Definition Multimedia Interface (HDMI) and DVI displays. Unlike HDMI, which is aimed at high-definition multimedia consumer electronics devices such as television monitors and DVD players, UDI was specifically targeted towards computer monitor and video card manufacturers and did not support the transfer of audio data. A contemporary rival standard, DisplayPort, gained significant industry support starting in 2007 and the UDI specification was abandoned shortly thereafter without having released any products.