64x32 P4 Panel with ICs ICN2037BP and 74HC1385 "half blank" last row, ghost pixel with ESP32 D1 MINI

[RestlessRabbits]

Hi, I am trying to get the Tetris Clock to work as an example and tried different driver settings without success or any change in behavior.

The pintout/connections:	HUB75	GPIO
R1	25
G1	26
B1	27
R2	14
G2	12
B2	13
A	23
B	19
C	5
D	17
E	18
LAT	4
OE	15
CLK	16

I tried the drivers

• HUB75_I2S_CFG::FM6126A
• HUB75_I2S_CFG::SHIFTREG
• HUB75_I2S_CFG::ICN2038S without any changes in behavior. Here is an image of the issues compared to a Waveshare 64x32 P2.5 Panel: Here is the back of the panel I struggle to get to work:

The Panels EAN is 4060137084737. They also are listed with "ListenVision" and QITA as a producer. For driving it lists "1/32-Sweep-Constantcurrentdrive" - which I just thought to be 1/32 scan, but maybe I'm mistaken here. Does anybody have experience or hints to get this display to work?

Thank you very much in advance!

[board707]

Your panel is built on drivers ICN2037 & 74HC138. These are the most commonplace drivers that do not require any special settings to work. The only thing that makes your panel unusual is that with a height of 32, it also has a scan of 32. Such panels have already come across here. Unfortunately, no one has yet figured out how to work with such panels. I dream that such a panel will fall into my hands. You can easily run a single panel by setup it as a 64x64 scan32 matrix. But so far no one has succeeded in connecting two or more such panels so that they work correctly

[RestlessRabbits]

Thank you very much! It works - I have to make adjustmends to the rest of the code because of the "wrong" assumtions in size, but in general, I finally get something displayed on the bottom half as well. Since I have two of these and one is planned to be used. Where are you located? Maybe I can send you at least that one panel to figure a few things out (sadly only one spare, so for chaining tests, you would need to get your hands on another)

[board707]

Thank you, but I hope to get such panel soon. Or perhaps someone else has already figured out such panels and will tell you how to work with them