BOE LVDS Capacitive Display Set

This section shows information about the BOE LVDS LCD Display with Capacitive Touch Panel (CTP) Set. The iMX93 Industrial Development Kit in this configuration is equipped with Yocto 5.0 (Scarthgap) (Linux version 6.6.52) to support LVDS display with a touchscreen layer. In this case, the display is not installed/attached to the iMX Development Baseboard.

Required Components

The iMX93 Industrial Kit Display Set includes a compact ready-to-use solution. To assemble them together, the following mechanical and electrical accessories were designed and selected to be parts of the Display set:

• LVDS LCD Display: BOE EV121WXM-N10-1850 (DY1212W-4856 12.1" (WXGA) TFT LCD) 1024*800 RGB with Capacitive Touch Panel (CTP)
• DY1212W-4856 LVDS Cable BOE LVDS Capacitive Display Set Video
• Voipac BOE LVDS Display Adapter
• 1x 6-core Flat Flex Cable (FFC) 10-06-D-0050-C-4-08-4-T
• 1x 40-core Flat Flex Cable (FFC) 05-40-D-0050-A-4-06-4-T

Mechanical connection

This part shows how to correctly connect cables and parts of the BOE Display Set. To enable smooth communication between the board and the display, connect following parts as shown below:

• DY1212W-4856 LVDS Cable to rear side of the BOE Display
• Mount BOE LVDS Display Adapter on bottom side of the baseboard
• Connect and link cables together with the adapter and baseboard

BOE LVDS Display rear view with cable:

Baseboard bottom side with mounted LVDS Display Adapter:

Baseboard and BOE LVDS Display Adapter connection. Be patient to connect FFC cables correctly.

NOTE: Due to easier handling when connecting the cables, we recommend to connect BOE LVDS Cable to the Display Adapter on baseboard as last one.

Hardware jumpers BOE LVDS

Make sure that configurable 0R resistors are assembled to support the default Newhaven / BOE LVDS0 interface.

Software instructions

iMX93 Industrial kit is preinstalled with Yocto 5.0 (Scarthgap) operation system enabling LVDS and touchscreen capabilities by default. Manual configuration is necessary, Devicetree in U-Boot have to by set to BOE LCD.

BOE LVDS Devicetree in U-Boot

Stop autoboot and set correct DTB file:

Fastboot: Normal
Normal Boot
Hit any key to stop autoboot:  0
u-boot=> fatls mmc 0:1
 35564032   Image
    69445   imx93-11x11-evk-aud-hat.dtb
    66749   imx93-11x11-evk-boe-wxga-lvds-panel.dtb
    65705   imx93-11x11-evk-flexio-i2c.dtb
    66009   imx93-11x11-evk-flexspi-m2.dtb
    66799   imx93-11x11-evk-i2c-spi-slave.dtb
    65062   imx93-11x11-evk-i3c.dtb
     2725   imx93-11x11-evk-inmate.dtb
    51134   imx93-11x11-evk-iw612-otbr.dtb
    65362   imx93-11x11-evk-ld.dtb
    65520   imx93-11x11-evk-lpuart.dtb
    65983   imx93-11x11-evk-mqs.dtb
    68814   imx93-11x11-evk-mt9m114.dtb
    65819   imx93-11x11-evk-rm67199.dtb
    65573   imx93-11x11-evk-root.dtb
    66108   imx93-11x11-evk-rpmsg-lpv.dtb
    66132   imx93-11x11-evk-rpmsg.dtb
   130428   imx93-11x11-evk_m33_TCM_low_power_wakeword.bin
    19080   imx93-11x11-evk_m33_TCM_power_mode_switch.bin
    18708   imx93-11x11-evk_m33_TCM_rpmsg_lite_pingpong_rtos_linux_remote.bin
    17228   imx93-11x11-evk_m33_TCM_rpmsg_lite_str_echo_rtos.bin
    47472   imx93-11x11-evk_m33_TCM_sai_low_power_audio.bin
    49066   imx93-voipac-evk-boe-wxga-lvds-panel.dtb
    47948   imx93-voipac-evk.dtb
   593744   tee.bin

25 file(s), 0 dir(s)

u-boot=> setenv fdtfile imx93-voipac-evk-boe-wxga-lvds-panel.dtb
u-boot=> saveenv
Saving Environment to MMC... Writing to MMC(0)... OK
u-boot=> boot

Touchscreen test

Default Voipac iMX93 Image contain evtest utility to catch touchscreen events. Make sure EETI EXC80H60 controller is detected and bound as input device

root@imx93-voipac:~# dmesg | grep -i EETI
[    1.972256] input: EETI EXC80H60 Touch Screen as /devices/platform/soc@0/44000000.bus/44350000.i2c/i2c-1/1-002a/input/input1
root@imx93-voipac:~#

Touchscreen events are generated after touching capacitive touch screen.

root@imx93-voipac:~# evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:      44440000.bbnsm:pwrkey
/dev/input/event1:      EETI EXC80H60 Touch Screen
/dev/input/event2:      gpio-buttons
Select the device event number [0-2]: 1
Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
Input device name: "EETI EXC80H60 Touch Screen"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 330 (BTN_TOUCH)
  Event type 3 (EV_ABS)
    Event code 0 (ABS_X)
      Value    150
      Min        0
      Max    16383
    Event code 1 (ABS_Y)
      Value    130
      Min        0
      Max    16383
    Event code 47 (ABS_MT_SLOT)
      Value      0
      Min        0
      Max        9
    Event code 53 (ABS_MT_POSITION_X)
      Value      0
      Min        0
      Max    16383
    Event code 54 (ABS_MT_POSITION_Y)
      Value      0
      Min        0
      Max    16383
    Event code 57 (ABS_MT_TRACKING_ID)
      Value      0
      Min        0
      Max    65535
Properties:
  Property type 1 (INPUT_PROP_DIRECT)
Testing ... (interrupt to exit)
Event: time 1709058939.097158, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 2
Event: time 1709058939.097158, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1344
Event: time 1709058939.097158, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 2340
Event: time 1709058939.097158, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 1709058939.097158, type 3 (EV_ABS), code 0 (ABS_X), value 1344
Event: time 1709058939.097158, type 3 (EV_ABS), code 1 (ABS_Y), value 2340
Event: time 1709058939.097158, -------------- SYN_REPORT ------------
Event: time 1709058939.197029, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 1334
Event: time 1709058939.197029, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 2371
Event: time 1709058939.197029, type 3 (EV_ABS), code 0 (ABS_X), value 1334
Event: time 1709058939.197029, type 3 (EV_ABS), code 1 (ABS_Y), value 2371
Event: time 1709058939.197029, -------------- SYN_REPORT ------------
Event: time 1709058939.259028, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value -1
Event: time 1709058939.259028, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 0
Event: time 1709058939.259028, -------------- SYN_REPORT ------------
Event: time 1709058955.128298, type 3 (EV_ABS), code 57 (ABS_MT_TRACKING_ID), value 3
Event: time 1709058955.128298, type 3 (EV_ABS), code 53 (ABS_MT_POSITION_X), value 2816
Event: time 1709058955.128298, type 3 (EV_ABS), code 54 (ABS_MT_POSITION_Y), value 3094
Event: time 1709058955.128298, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 1709058955.128298, type 3 (EV_ABS), code 0 (ABS_X), value 2816
Event: time 1709058955.128298, type 3 (EV_ABS), code 1 (ABS_Y), value 3094
...

Note: In case everything is connected correctly and the touch does not work, please read this NXP ERRATA document.

Demo Example

BOE LVDS Capacitive Display Set Video