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WSAL21316 – 2.8inch HDMI LCD (H)/en - Versionsgeschichte
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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
<br />
== Summary ==<br />
The 2.8-inch HDMI LCD (H) is a compact IPS display with 480×640 resolution, 5-point capacitive touch, and an optically bonded glass surface. It works with Raspberry Pi, Jetson Nano, and as an external monitor under Windows.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL21316 WSAL21316 – 2.8inch HDMI IPS LCD Display (H), 480×640, Adjustable Brightness, Optical Bonding Screen]<br />
<br />
== Technical overview ==<br />
* Resolution: 480 × 640 pixels in portrait orientation<br />
* 5-point capacitive touch on toughened glass (6H hardness)<br />
* Optical bonding reduces reflections and improves contrast<br />
* Interfaces: HDMI, USB-C (power/touch), I²C (touch)<br />
* Raspberry Pi connection via pogo pins on the back<br />
* Supported OS: Raspberry Pi OS, Ubuntu, Kali, Retropie, Win10 IoT (Pi); Ubuntu (Jetson Nano); Windows 7–11 (PC)<br />
* Brightness is software-adjustable for power saving<br />
* Defaults to portrait; landscape requires manual rotation settings<br />
<br />
'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
hdmi_force_hotplug=1<br />
hdmi_group=2<br />
hdmi_mode=87<br />
hdmi_timings=480 0 100 16 100 640 0 100 20 100 0 0 0 60 0 42000000 6<br />
dtparam=i2c_arm=on<br />
dtoverlay=waveshare-28HDMI-3b<br />
dtoverlay=waveshare-28HDMI-4b<br />
dtoverlay=waveshare-28HDMI-5b<br />
start_x=1<br />
gpu_mem=128<br />
display_rotate=3<br />
xrandr -o 1<br />
fbcon=rotate:3 video=HDMI-A-1:640x480M@60,rotate=90<br />
Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"<br />
sudo apt-get update && sudo apt-get full-upgrade<br />
sudo apt install xserver-xorg-input-synaptics<br />
sudo cp /usr/share/X11/xorg.conf.d/40-libinput.conf /etc/X11/xorg.conf.d/<br />
sudo udevadm control --reload-rules && sudo udevadm trigger<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* The exact hdmi_timings values are version-sensitive and may need adjustment per firmware.<br />
* DTBO files (waveshare-28HDMI-3b/4b/5b) must be downloaded separately and copied to /boot/overlays.<br />
* Ubuntu path layout differs between 32-bit and 64-bit versions; the correct gdm3/lightdm path must be verified beforehand.<br />
* The touch calibration matrix varies by target angle (90°, 180°, 270°).<br />
* The touch interface switch (USB vs I²C) must be set manually before operation.<br />
* Missing or outdated drivers may prevent display detection; a system update might be required.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/2.8inch_HDMI_LCD_(H) 2.8inch HDMI LCD (H) - Waveshare Wiki]<br />
* Source revision: 110808<br />
* Captured: 2026-09-03T02:40:35+00:00<br />
* SHA-256: <code>5fe09d4ac4e4c107e193c893db9be6f6c1208e561421ca1339fa84178ae4f3ef</code></div>
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