Chipsee LCD 7 EXP R on Beaglebone Black


I tried to use Chipsee LCD 7 EXP R as a screen of my BBB (the OS is : Linux beaglebone 4.1.15-ti-rt-r43 #1 SMP PREEMPT RT Thu Jan 21 20:13:58 UTC 2016 armv7l GNU/Linux),
I did sudo sed -i -e ‘s:16:24:g’ /etc/X11/xorg.conf and changed dtb=am335x-boneblack-bbb-exp-r.dtb in /boot/uEnv.txt, ( by the introduction of : ).
But the result is wired, I can light the screen but without anything display, which means the screen is always light with empty content.

There must be something wrong in my process, but I have no idea to correct it, Thanks so much for any advice.

Best regards,