RPi Display: 7.84 touch screen

Introduction

This product is a general-purpose 7.9-inch HDMI display with a resolution of 400 × 1280 and a capacitive touch panel， which supports Raspberry Pi and can also be used as a computer monitor.

Features

• 7.9inch IPS screen, 400 x 1280 resolution, HDMI/USB interfaces.

• 5-point capacitive touch control, tempered glass panel, hardness up to 6H.

• Used with Raspberry Pi, supports Raspberry Pi OS / Ubuntu / Kali and Retropie, single touch and driver free.

• Using as a computer monitor, it supports Windows 11/ 10 / 8.1 / 8 / 7, five-point touch, and driver free.

Working with Raspberry Pi

After the RPi image has finished writing, open the config.txt file in the root directory of the TF card, add the following code at the end of config.txt, then save and quit the TF card safely.

Enable HDMI and Rotation

// Some code
## Enable 7.84 wisdPi LCD HDMI
hdmi_group=2
hdmi_mode=87
hdmi_timings=400 0 100 10 140 1280 10 20 20 2 0 0 0 60 0 43000000 3
Display Rotate

## Display Rotate
## It can be 1: 90°; 2: 180°C; 3: 270°
display_rotate=3
## Note that the 90 and 270 degree rotation options require additional memory on the GPU, so these will not work with the 16MB GPU split.
gpu_mem=32

Touch orientation

After the display is rotated, the position of touch is incorrect because the touch doesn’t change with the display angle. So the touch also needs to be modified.

For this display, we provide two touch rotation methods.

Rotation

1.Install libinput.

sudo apt-get install xserver-xorg-input-libinput

2.Create the xorg.conf.d directory under /etc/X11/ (if the directory already exists, proceed directly to step 3).

sudo mkdir /etc/X11/xorg.conf.d

3.Copy the 40-libinput-conf file to the directory you created just now.

sudo cp /usr/share/X11/xorg.conf.d/40-libinput.conf /etc/X11/xorg.conf.d/

4.Edit this file.

sudo nano /etc/X11/xorg.conf.d/40-libinput.conf

Find the part of the touchscreen, add the following statement inside, and then save the file.

Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"

Similar to the picture below:

5. Restart the Raspberry Pi.

sudo reboot

Note:

• 90 degree rotation: Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"

• 180 degree rotation: Option "CalibrationMatrix" "-1 0 1 0 -1 1 0 0 1"

• 270 degree rotation: Option "CalibrationMatrix" "0 -1 1 1 0 0 0 0 1"

PACKAGE CONTENT

• 7.84 inch HDMI LCD with touch panel x1

• USB A to Micro-B cable x1

• HDMI 1.4a cable x1

• Micro HDMI to HDMI Adapter x1

Resources

38KB

7.84 LCD HDMI-MIPI PCB Mechanical.pdf

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292KB

7.84 LCD NTW078301G05-24M_IVO 20170405.pdf

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