HI @josephjang ,
Yes, is possible to use 2x displays independently. You essentially need to define a lvds-channel@1 similar to what this customer did in the device tree (overlay).
This information from the kernel is also useful.
From the Verdin iMX8M Plus datasheet:
A single channel LVDS interface can support resolutions up to 1366×768 pixels @60 frames per second (80MHz pixel clock maximum). For higher resolutions, a second LVDS channel is required.
I did some work in LVDS some time ago that helps explain how is LVDS transmitted:
Mitsubishi Displays - Linux information - Toradex - V1.pdf (973.8 KB)
Conclusion: Yes, you shoule be able to drive 2 independent LCD if each of them are upto 1366×768 pixels @60 frames per second (80MHz pixel clock maximum).
Kind regards,
Alvaro.