Display Solutions for COM boards

Available Display Interfaces?

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.

 

EACOM board Parallel RGB LVDS #0 LVDS #1 HDMI MIPI-DSI
iMX6 UltraLite COM        
iMX6 SoloX COM      
iMX6 DualLite COM
iMX6 Dual COM
iMX6 Quad COM
iMX7 Solo COM      
iMX7 Dual COM      
iMX7 Dual uCOM
(via adapter board)
     

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.
  • LVDS
    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.
  • HDMI/DVI
    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.
  • MIPI-DSI
    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.

COM Carrier Board

Our iMX Developer's Kits builds upon the COM Carrier Board. iMX Developer's Kits are typically used in the proof-of-concept and prototype phase of a project. Hence, the task of "adding a display" will typically be the same as interfacing it to the COM Carrier Board. The picture below illustrates the location of the display interface connectors.

COM Display Adapter - for Parallel RGB

The COM Display Adapter is a reference design for the small adapter board that is needed when connecting any parallel RGB display. The board contains:

  • adjustable current backlight driver (20-160mA)
  • resistive touch panel controller, AR1021 from Microchip
  • connectors to different capacitive touch panel controllers to supported displays (with I2C interfaces)

The picture below illustrates how the COM Display Adapter is connected to the COM Carrier Board and an LCD.

Below is a list of (some) supported displays

Many, but not all, of the listed display have been verified to work. Some have been verified to be compatible via their respective datasheets.

Display
Size (in inch)
Display Resolution Touch Panel Manufacturer Part Number
4.3 480 x 272 Resistive Rogin RX043A-0207-T
4.3 480 x 272 - NewHaven NHD-4.3-480272EF-ATXL#
4.3 480 x 272 Resistive NewHaven NHD-4.3-480272EF-ATXL#-T
4.3 480 x 272 Capacitive NewHaven NHD-4.3-480272EF-ATXL#-CTP
4.3 480 x 272 - NewHaven NHD-4.3-480272EF-ASXN#
4.3 480 x 272 Resistive NewHaven NHD-4.3-480272EF-ASXN#-T
4.3 480 x 272 Capacitive NewHaven NHD-4.3-480272EF-ASXN#-CTP
4.3 480 x 272 - NewHaven NHD-4.3-480272EF-ASXV#
4.3 480 x 272 Resistive NewHaven NHD-4.3-480272EF-ASXV#-T
4.3 480 x 272 Capacitive NewHaven NHD-4.3-480272EF-ASXV#-CTP
4.3 480 x 272 - EDT ET043080DM6
4.3 480 x 272 Resistive EDT ET043080DH6
4.3 480 x 272 Capacitive URT UMSH-8864MD-10T
5.0 800 x 480 Resistive Rogin RX050A-05-T
5.0 800 x 480 Capacitive URT UMSH-8837MD-4T
5.0 800 x 480 - NewHaven NHD-5.0-800480TF-ATXL#
5.0 800 x 480 Resistive NewHaven NHD-5.0-800480TF-ATXL#-T
5.0 800 x 480 Capacitive NewHaven NHD-5.0-800480TF-ATXL#-CTP
5.0 800 x 480 - EDT ET050080DM6
5.0 800 x 480 Resistive EDT ET050080DH6
7.0 800 x 480 - NewHaven NHD-7.0-800480EF-ATXL#
7.0 800 x 480 Resistive NewHaven NHD-7.0-800480EF-ATXL#-T
7.0 800 x 480 Capacitive NewHaven NHD-7.0-800480EF-ATXL#-CTP
7.0 800 x 480 - NewHaven NHD-7.0-800480EF-ATXV#
7.0 800 x 480 Resistive NewHaven NHD-7.0-800480EF-ATXV#-T
7.0 800 x 480 Capacitive NewHaven NHD-7.0-800480EF-ATXV#-CTP
7.0 800 x 480 - EDT ET070080DM6
7.0 800 x 480 Resistive EDT ET070080DH6
7.0 800 x 480 Resistive Innolux AT070TN83
7.0 800 x 480 Capacitive URT UMSH-8596MD-30T

​If a specific display is not supported by the COM Display Adapter, then it can be used as a reference to create an adapter board that fits the specific display perfectly.

For more details about the COM Display Adapter, see the product page for the board.

Custom Adapter Cable - for displays with LVDS Interface

The two LVDS interfaces on the COM Carrier Board connect directly to NXP's/Freescale's 10.1 inch (1024 x 768 pixels) LVDS reference display (MCIMX-LVDS1). This is a very quick way to get an LVDS display up-and-running... just plug it in!

For other displays with LVDS interface an adapter cable, or small adapter board, must be designed. There is no standard adapter cable or board available since there are many different connectors and different pinnings involved. It has to be created on a case-by-case basis, but fortunately this task is typically very simple. The picture below illustrates the two options:

  • If the display's LVDS interface is similar to the COM Carrier Board LVDS connector, as simple adapter cable can typically be created.
  • If the display's LVDS interface has significant differences to the COM Carrier Board LVDS connector, a small adapter board will have to be created. It can for example contain connector adaptations and backlight driving.

 

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TouchGFX Graphical Demo on iMX6UL / iMX7D