The i.MX 6/7 application processor families are very versatile:
- Up to 5 different display interfaces available
- 2-4 interfaces can be active simultaneously
- All display interface signals are available on the EACOM board edge connector
The picture below illustrates which display interfaces are available on different EACOM boards.
Some characteristics of the different display interfaces:
- Parallel RGB
This interface is common for smaller, internal displays with horizontal resolution up to about 800 pixels (up to about 7 inch displays). Up to 24-bit color depth is supported.
This interface is common for larger, internal displays.
For 18-bit color depth, one clock and three data lanes are used. For 24-bit color depth, one more data lane is added.
This interface is common for larger, external displays/monitors. Both HDMI and DVI-I uses the same underlying signaling technology, TMDS, which is a differential signaling serial bus.
This interface is common on small, high-resolution displays for handheld equipment, like mobile phones and tablets.
It is a differential signaling serial bus with one clock lane and one or more data lanes (1-2 data lanse supported).
Because of EMC, a parallel RGB interface should only be used over short distances with well-controlled trace impedance and low pixel clock frequency (<20MHz). If length or clock frequency increase, a differential signaling bus should be considered.
For more details about available display interfaces and how to add displays,
read our document Adding Displays to iMX Developer's Kits.