128x128 SSD1327 OLED display is being dark...

[4k3or3et]

Type of Raspberry Pi

RPi3B+ with original power supply

Linux Kernel version

Linux test 6.6.51+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.6.51-1+rpt3 (2024-10-08) aarch64 GNU/Linux

Expected behaviour

OLED display to be bright as my other smaller 128x64 SH1106 display

Actual behaviour

Hi all

i have bought 128x128 OLED display which i sort of got to work. This is SSD1327 (ZJY-M150-128*128-4P). The problem i have with this display is that it is very dark compared to my other 128x64 SH1106 display. The test script i have used so far is:
Code: Select all

#!/usr/bin/python
from luma.core.interface.serial import i2c
from luma.core.render import canvas
from luma.oled.device import ssd1327
from PIL import ImageFont
from time import sleep

serial=i2c(port=1, address=0x3C)
device=ssd1327(serial, width=128, height=128, mode='1')

font1=ImageFont.truetype("/root/oledfont.ttf", 64)
device.contrast(255)

with canvas(device) as draw:
 draw.text((0, 0), ("test"), fill="white", font=font1)
sleep(10)

Of course font does exist in place where it is stated.

One thing worth mentioning is that when i connect that display to 3V the script is being executed without errors but nothing lights up on the screen. On 5V you can see the 'test' text but it is very dark.

I have tried on two RPi's. RPi3B+ and RPi5. Both on official power supplies.

I know that this display has some bits of greyscale but I have no clue if that may be the cause of my problem and i cannot figure out how to control it.

Does anyone know how to make this display to be as bright as my other smaller OLED display?

I am attaching some pictures of that display: