18bit LVDS display

Technical Support
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Thank you for providing the detailed system information! Based on your setup (Verdin iMX8MP V1.1B running Torizon OS 7.2.0-devel), I can help you configure an 18-bit LVDS panel with JEIDA format.

Understanding LVDS Interface Options

The Verdin iMX8MP supports both 18-bit and 24-bit LVDS interfaces with different color mapping standards(1). For 18-bit displays, you need to use the JEIDA format (Intel 24.0 LVDS data format), which is backward compatible and allows connecting 18-bit displays to 24-bit interfaces(1).

Available Pre-built Overlays

For Torizon OS 7.x on Verdin iMX8MP, the following LVDS overlays are available(2):

  • verdin-imx8mp_panel-cap-touch-10inch-lvds_overlay.dtbo - LVDS native, Capacitive Touch Display 10.1" LVDS
  • verdin-imx8mp_dsi-to-lvds_panel-cap-touch-10inch-lvds_overlay.dtbo - DSI to LVDS, Capacitive Touch Display 10.1" LVDS

Device Tree Configuration for 18-bit JEIDA LVDS

Based on the datasheet information, here’s how to configure your custom 18-bit LVDS overlay(1):

Key Configuration Points:

  1. Data Mapping: Set fsl,data-mapping = "jeida"
  2. Data Width: Set fsl,data-width = <18>
  3. Panel Timing: Configure according to your 6.5" panel specifications

LVDS Signal Configuration

The 18-bit JEIDA format uses the following signal mapping(1):

  • LVDS1_A_TX0+/-: Contains R5-R0, G2 signals
  • LVDS1_A_TX1+/-: Contains G5-G0, B3 signals
  • LVDS1_A_TX2+/-: Contains B5-B0, DE, VSYNC, HSYNC signals
  • LVDS1_A_TX3+/-: No output (Hi-Z) for 18-bit mode

Applying the Overlay

You can apply device tree overlays using TorizonCore Builder(3). First, clone the device tree overlays repository(3):

$ git clone -b toradex_6.6-2.1.x-imx git://git.toradex.com/device-tree-overlays.git device-trees

(3)

Then modify an existing LVDS overlay or create a custom one with the 18-bit JEIDA configuration, and deploy it using(3):

$ torizoncore-builder dto deploy --remote-host <YOUR_IP> --remote-username torizon --remote-password <PASSWORD> --force --reboot <your-custom-overlay>.dts

(3)

Troubleshooting White Screen Issues

If you’re seeing a white screen, common issues include(4):

  1. Incorrect timing parameters for your specific panel
  2. Wrong data mapping or bit depth configuration
  3. Missing or incorrect panel power/enable sequences
  4. Incompatible overlay compilation

Make sure your overlay is compiled for the correct kernel version and that all timing parameters match your 6.5" panel specifications.

Best regards, Toradex AI Assistant.

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