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Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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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.

== Summary ==
The 21.5-inch capacitive touch monitor provides a native 1920×1080 resolution via a standard HDMI port and is powered by a 12 V/3 A supply. It is suitable for use with Raspberry Pi (including Raspberry Pi OS, Ubuntu, Kali, Retropie), Jetson Nano (Ubuntu), and as a PC monitor under Windows 7–11.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL24002 WSAL24002 – 21.5inch Capacitive Touch Monitor, 1920×1080 Full HD, Optical Bonding Toughened Glass Panel, HDMI, 10-Point touch]
* [https://shop.jw-tech.eu/p/WSAL24085 WSAL24085 – 21.5inch Capacitive Touch Monitor, 1920×1080 Full HD, Optical Bonding Toughened Glass Panel, HDMI, 10-Point touch]
* [https://shop.jw-tech.eu/p/WSAL24108 WSAL24108 – 21.5inch Capacitive Touch Monitor, 1920×1080 Full HD, Optical Bonding Toughened Glass Panel, HDMI, 10-Point touch]
* [https://shop.jw-tech.eu/p/WSAL24109 WSAL24109 – 21.5inch Capacitive Touch Monitor, 1920×1080 Full HD, Optical Bonding Toughened Glass Panel, HDMI, 10-Point touch]
* [https://shop.jw-tech.eu/p/WSAL24110 WSAL24110 – 21.5inch Capacitive Touch Monitor, 1920×1080 Full HD, Optical Bonding Toughened Glass Panel, HDMI, 10-Point touch]
* [https://shop.jw-tech.eu/p/WSAL24111 WSAL24111 – 21.5inch Capacitive Touch Monitor, 1920×1080 Full HD, Optical Bonding Toughened Glass Panel, HDMI, 10-Point touch]
* [https://shop.jw-tech.eu/p/WSAL31990 WSAL31990 – 21.5inch Capacitive Touch Monitor, 1920×1080 Full HD, Optical Bonding Toughened Glass Panel, HDMI, 10-Point touch]
* [https://shop.jw-tech.eu/p/WSAL32008 WSAL32008 – 21.5inch Capacitive Touch Monitor, 1920×1080 Full HD, Optical Bonding Toughened Glass Panel, HDMI, 10-Point touch]
* [https://shop.jw-tech.eu/p/WSAL32009 WSAL32009 – 21.5inch Capacitive Touch Monitor, 1920×1080 Full HD, Optical Bonding Toughened Glass Panel, HDMI, 10-Point touch]

== Technical overview ==
* IPS panel with 1920×1080 hardware resolution and 60 Hz refresh rate.
* 10-point capacitive touch on toughened glass rated up to 6H hardness; optically bonded glass panel.
* Operating temperature range: −5 °C to +60 °C; storage temperature: −10 °C to +70 °C.
* Default brightness 350 cd/m², contrast ratio 1000:1, color gamut 72 % NTSC.
* Input current must be at least 3 A; insufficient power can cause startup failure or permanent damage if prolonged.
* EDID timing parameters are predefined (pixel clock 148.50 MHz, H/V addressable 1920/1080, blanking 280/45, front porch 88/44, sync width 4/5).
* When using Raspberry Pi, the resolution must be set manually in config.txt; the guide lists specific lines such as hdmi_force_hotplug=1, hdmi_group=2, hdmi_mode=87, hdmi_timings=…, and config_hdmi_boost=10.
* To rotate the display on Bullseye/Buster: add display_rotate=1/2/3 to /boot/config.txt, then restart with sudo reboot.
* Touch rotation requires installing libinput or synaptics depending on the system; the calibration matrix is added to /etc/X11/xorg.conf.d/40-libinput.conf.
* To switch the screen off/on, use the commands vcgencmd display_power 0 and vcgencmd display_power 1.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
hdmi_force_hotplug=1
max_framebuffer_height=1080
hdmi_group=2
hdmi_mode=87
hdmi_timings=1920 0 88 44 148 1080 0 4 5 36 0 0 0 60 0 148500000 0
config_hdmi_boost=10
display_rotate=1 #1：90；2: 180； 3: 270
sudo reboot
sudo apt-get install xserver-xorg-input-libinput
sudo apt install xserver-xorg-input-synaptics
sudo mkdir /etc/X11/xorg.conf.d
sudo cp /usr/share/X11/xorg.conf.d/40-libinput.conf /etc/X11/xorg.conf.d/
sudo nano /etc/X11/xorg.conf.d/40-libinput.conf
Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"
Option "CalibrationMatrix" "-1 0 1 0 -1 1 0 0 1"
Option "CalibrationMatrix" "0 -1 1 1 0 0 0 0 1"
sudo nano /etc/lightdm/lightdm.conf
xserver-command=X -s 0 -dpms
vcgencmd display_power 0
vcgencmd display_power 1
</syntaxhighlight>

== Notes and version constraints ==
* The exact firmware/software version and operating system determine which steps are actually required; consult the relevant documentation before modifying the system.
* If the power supply is below 3 A, startup failures or permanent damage may occur – always use the matching 12 V/3 A adapter.
* Storing the display in high-temperature/high-humidity conditions for extended periods can damage it; stay within the specified limits.
* Some PCs do not support HDMI plug-and-play; a system reboot may be necessary.
* Rotation steps apply only to certain distributions (e.g., Bullseye/Buster); other systems require different procedures.

== Source and revision record ==
* [https://www.waveshare.com/wiki/21.5inch_FHD_Monitor 21.5inch FHD Monitor - Waveshare Wiki]
* Source revision: 110871
* Captured: 2026-09-04T03:45:09+00:00
* SHA-256: <code>032978dc1de5709a36229e71d79072d738c003541a99878271e7fa1867d12ce9</code>

WSAL24002 – 21.5inch FHD Monitor/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex