Why EDP cable was created
With the higher and higher display resolution, the traditional interfaces such as VGA and DVI can not meet people’s visual needs./nThen there are new digital interfaces, such as HDMI and DisplayPort. HDMI has a big advantage in the external interface, but DisplayPort adjusts its structure with its own advantages, and the gap is closing./nThe internal interface of the traditional use of LVDS, LVDS face increasingly difficult high-resolution display, DisplayPort internal interface EDP was born, will gradually replace LVDS in the future
What is EDP cable
EDP (Embedded, Embedded Displayport) , which is a kind of internal digital interface based on DisplayPort architecture and protocol. EDP is gradually replacing the old low-voltage differential signal (LVDS) transmission interface, especially on panels with FHD (1,920 x 1,080 or 1,920 x 1,200) or resolution beyond FHD. You can easily find EDP applications in a variety of products with embedded display panels, including All-in-One pcs, laptop or tablets./nThe EDP has three basic architectures. The following is a brief description of the basic architecture of DisplayPort, including the DisplayPort data transfer Main Link, AUX Channel, and Link Training.
EDP Cable VS LVDS Cable
Now take an LG display LM240WU6 as an example of the transport advantages of EDP:/nLM240WU6: WUXGA level resolution 1920 × 1200,24-bit color depth, 16,777,216 colors/nYou need 20 lanes with a traditional LVDS driver/nOnly 4 lanes are needed for EDP.
What are the advantages of EDP cable
- Micro-packet structure, EDP CABLE can achieve multi-data simultaneous transmission
- EDP CABLE has a high transmission rate, with 4lanes up to 21.6 Gbps
- EDP cable has a smaller size, 26.3 mm wide, 1.1 mm high, which is conducive to the thin and light products
- EDP CABLE does not require LVDS conversion circuit, simplifying the design
- EDP CABLE has low EMI
- EDP CABLE has strong copyright protection features
What is part of the EDP DisplayPort architecture
The EDP has three basic architectures. The following is a brief description of the basic architecture of DisplayPort, including the DisplayPort data transfer Main Link, AUX Channel, and Link Training.
- main channel for video and audio data transmission
The data coding protocol adopts 8B/10B coding, through which only a Differential Signal Pair is needed to transmit data and clock simultaneously. The connector consists of four pairs of differential signal lines, or four main channels, which are used to transmit image data. Depending on the amount of data displayed, one, two or four Lane channels can be used to transmit data
EDP defines three different transmission rates, each of which can choose to use 1.62 Gbit/s, 2.7 Gbit/s or 5.4 Gbit/s. Because DisplayPort uses 8b/10b encoding, which adds a bit more data to the encoding, the maximum data transfer rate that DisplayPort can actually support is:
(4-path) x (5.4 Gbit/s per path) x (8/10 Coding Overhead) = 17.28 Gbit/s
2.The AUX channel is used to transmit settings and instructions
The DisplayPort connector also contains a separate two-way transmission auxiliary channel called Aux Channel or AUX for short, again using two differential signal lines with a single direction rate of only about 1 Mbit/s, used to transmit settings and control instructions, and more on the use of EDP later. It also includes reading Extended display identification data information (EDID) to ensure that the correct image format is transmitted (other interfaces such as LVDS, VGA, DVI and HDMI are transmitted through I2C) ; Read the contents of DisplayPort items supported by the display, such as how many main channels, transfer rates and other items, set various display configuration registers, and read the display status register.
3. the connection process helps to enhance the reliability of the main channel
Connection is the process of establishing a connection between the DisplayPort Transmitter and the Receiver before the data is transmitted. The sending end and the receiving end communicate with each other through AUX to determine whether the connection is successful. The connection can increase the reliability of the main channel and reduce data errors, and it can compensate the difference of electric property caused by different length and kinds of cables, especially the difference of signal routing on the system board of the transmitting end and the receiving end.
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