Rpi 3B+ outdoor p2.5 128x64 - adjacent pixels light up

1

Hi everyone, and special thenks for Marc MERLIN.
I have a problem, please help if you can. When text is displayed on a screen of any size or color, adjacent pixels are also highlighted. I will attach a photo to make it clearer.

image_2021-02-15_14-02-36
image_2021-02-15_14-02-36768×1032 141 KB

  1. I use Raspberry pi 3B+
  2. P2.5
    |Chip|Epstar |
    |Light type|SMD1515|
    |Pixel Pitch|2.5mm|
    |Module Size|320mmX160mm|
    |Module Resolution |128 X 64 (dots)|
    |Density of pixel|160000dots/m2|
    |Pixel configuration|1R1G1B|
    |Red wavelength|625±2nm|
    |Green wavelength|525±2nm|
    |Blue wavelength|470±2nm|
    |Colors|16777216|
    |Best viewing distance|≥2.5m|
    |viewing angle|120°/90°|
    |Maximum power consumption|20W|
    |Brightness|5000cd/m2|
    |Gray scale|14bits per color|
    |Color temperature|6500k|
    |Control method|Synchronization or Asynchronization|
    |Driving method|1/16 scanning|
    |Frame frequency|60Hz|
    |Refresh frequency|≥2000Hz|
    |Working Voltage|DC5V|
    |IP grade|IP54|
    |MTBF|More than 8000hours|
    |Life Span|80,000hours|
2

I believe this is addressed in GitHub - hzeller/rpi-rgb-led-matrix: Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO under “ghosting”

3

Thank you very much for the article - I missed it. Now I will start studying. I hope I solve my problem.

Thanks for your hard work!

4

checked the options specified in the description on git hub:
–led-pwm-lsb-nanoseconds 100 to 2000
–led-pwm-dither-bits
–led-no-hardware-pulse
No noticeable improvement was observed.
With a value of 1000, 2000, the shadows disappeared, but the image began to blink - it is impossible to watch in this mode

5

Sorry to hear it didn’t work. I haven’t seen this problem myself. Maybe it is something that only happens on some panels?

6

Unfortunately not, I checked on other screens and the same problem is everywhere. the manufacturer of led panels can not advise anything other than their controllers. used p4 before and everything worked fine, decided to try p2.5 and this is where the problems started. the bad thing is that a batch of 50 was bought

7

by “some panels” I meant “some other kinds”. It’s clear that in the batch you got, they will more or less all be the same.
you may want to try to control them with other libraries/hardware (like pixelmatrix on teensyv4) and see if you get similar issues.

8

I use azerone panels and they have worked for me so far: Amazon.com