https://wiki.jw-tech.eu/index.php?action=history&feed=atom&title=WSAL18628_%E2%80%93_2.8inch_DPI_LCD%2FenWSAL18628 – 2.8inch DPI LCD/en - Versionsgeschichte2026-10-23T22:04:09ZVersionsgeschichte dieser Seite in JW Tech WikiMediaWiki 1.43.9https://wiki.jw-tech.eu/index.php?title=WSAL18628_%E2%80%93_2.8inch_DPI_LCD/en&diff=1782&oldid=prevJWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex2026-09-05T22:36:41Z<p>Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex</p>
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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 />
A 2.8-inch display with an IPS panel, capacitive touch (5-point), DPI connection, and a toughened glass cover for Raspberry Pi.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL18628 WSAL18628 – 2.8inch Capacitive Touch Screen LCD for Raspberry Pi, 480×640, DPI, IPS, Optical Bonding Toughened Glass Cover, Low Power]<br />
<br />
== Technical overview ==<br />
* Resolution: 480 × 640 pixels<br />
* Connection: 40-pin GPIO of the Raspberry Pi via the DPI interface<br />
* Refresh rates up to 60 Hz<br />
* Capacitive touchscreen over I²C; 5-point touch<br />
* Toughened glass cover with hardness up to 6H<br />
* Low power consumption: approx. 5 V / 160 mA<br />
* Supported operating systems: Raspberry Pi OS Bookworm, Bullseye, Buster, Ubuntu<br />
* Software setup via config.txt or cmdline.txt depending on the system version<br />
* Display and touch rotation can be set synchronously (Bookworm) or separately<br />
* Do not extend the connection distance beyond 10 cm – use HDMI/MIPI DSI/LVDS for longer distances<br />
<br />
'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
dtoverlay=vc4-kms-v3d<br />
dtoverlay=waveshare-28dpi-3b-4b<br />
dtoverlay=waveshare-28dpi-3b<br />
dtoverlay=waveshare-28dpi-4b<br />
dtoverlay=waveshare-touch-28dpi<br />
dtoverlay=vc4-kms-dpi-2inch8<br />
gpio=0-9=a2<br />
gpio=12-17=a2<br />
gpio=20-25=a2<br />
dtoverlay=dpi24<br />
enable_dpi_lcd=1<br />
display_default_lcd=1<br />
extra_transpose_buffer=2<br />
dpi_group=2<br />
dpi_mode=87<br />
dpi_output_format=0x7F216<br />
hdmi_timings=480 0 26 16 10 640 0 25 10 15 0 0 0 60 0 32000000 1<br />
dtoverlay=waveshare-28dpi-3b-4b<br />
dtoverlay=waveshare-28dpi-3b<br />
dtoverlay=waveshare-28dpi-4b<br />
video=DPI-1:480x640M@60,rotate=90<br />
video=DPI-1:480x640M@60,rotate=180<br />
video=DPI-1:480x640M@60,rotate=270<br />
display_rotate=1 #1: 90; 2: 180; 3: 270<br />
ENV{ID_INPUT_TOUCHSCREEN}=="1", ENV{LIBINPUT_CALIBRATION_MATRIX}="0 -1 1 1 0 0"<br />
Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* The exact DTBO files must be downloaded from Waveshare and copied into /boot/overlays/; the source text does not include a direct download URL.<br />
* When using both DPI and HDMI simultaneously, they share the same rotation value – separate rotation is not possible.<br />
* For older systems (Stretch/Jessie), display_rotate must be set in config.txt; this method does not work on newer KMS-based systems.<br />
* Touch calibration matrices are version-sensitive; incorrect values lead to inconsistent touch orientation.<br />
* Extending the cable beyond 10 cm may cause signal interference; alternative interfaces such as HDMI or MIPI DSI are recommended.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/2.8inch_DPI_LCD 2.8inch DPI LCD - Waveshare Wiki]<br />
* Source revision: 109983<br />
* Captured: 2026-09-01T03:35:16+00:00<br />
* SHA-256: <code>55d04d20dca721bae1577b84e862f1d3565a71acee0876f8bda12afed8005bc0</code></div>JWTechPublisher