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#1 2019-05-13 16:38:05

PhiMX
Member
Registered: 2019-05-10
Posts: 21

2K 5.5" LCD image stretched

Hi,

I got my anycubic photon conversion done now and I already mada a first print which worked 99% perfect.
the 1% not perfect is the  following:

I use a 5.5" Sharp 2560x1440 2K LS055R1SX03 screen that most people use (mine came from an anycubic photon, but wanhao D7 for example uses the same screen) and have connected it through the HDMi to MIPI adapter board from aliexpress. I guess this is a pretty common setup in the NanoDLP world.
It works quite good so far with the only exception that my prints are stretched in the landscape orientation. See example picture with print and round object everybody is familiar to as reference:
20190513-160340.jpg
The printed object is supposed to be the same in every direction, but is clearly stretched.
I have also attached the test pattern as a reference

20190513-160943.jpg


as well as my raspi config file:

#Use HDMI 
hdmi_force_hotplug=1
#define mode 87
hdmi_timings=1440 0 60 10 35 2560 0 4 2 2 0 0 0 50 0 198000000 0 
#force mode
hdmi_group=2
hdmi_mode=87
hdmi_pixel_freq_limit=500000000
hvs_priority=0x32ff
max_framebuffer_width=1440
max_framebuffer_height=2560
framebuffer_width=1440
framebuffer_height=2560
framebuffer_depth=24
framebuffer_ignore_alpha=1
config_hdmi_boost=4
gpu_mem=192

# Additional overlays and parameters are documented /boot/overlays/README
enable_uart=1
start_x=1

Bildschirmfoto-2019-05-13-um-18-33-27.png

Does anybody have an explanation for this behavior? And hopefully better, a solution to fix it?
Thank you so much!

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#2 2019-05-13 16:44:06

PhiMX
Member
Registered: 2019-05-10
Posts: 21

Re: 2K 5.5" LCD image stretched

Oh, I forgot to add:

I needed to change the resolution in the machine settings from HxV 2560x1440px to 1440x2560, otherwise the screen would have been rotated by 90 degrees, and thus be only a fraction of the whole screen.
I have a feeling that I impworsened the whole situation by doing this.

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#3 2019-05-14 07:59:51

Shahin
Administrator
Registered: 2016-02-17
Posts: 3,536

Re: 2K 5.5" LCD image stretched

You can do rotation on config.txt see if it makes any difference.

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#4 2019-05-15 10:36:15

PhiMX
Member
Registered: 2019-05-10
Posts: 21

Re: 2K 5.5" LCD image stretched

Hi,

ok I tracked the problem down a little bit further.
Regarding the LCD, it is fine. Actually the values I entered in the confix.txt as well as the rotated values in the machine settings are the only values at which the
LCD displays an useable image. In all other cases, it is somehow squished to a quadratic image in the middle of the LCD, or somehow disrupted and flickering like crazy.


Ok, now to the tracked down problem; it is the slicer that sqishes the image, not the LCD.
When I go and display the calibration plate, the square is perfectly quadratic, indicating that the LCD displays correctly.
When I download the sliced file and display the slices on my mac, they are also sqished, indicating that the LCD is not the problem.
And then I found the real problem:

Bildschirmfoto-2019-05-15-um-12-25-27.png

the slicer somehow by itself decides to make a voxel 65µm by 47,2µm by 50µm but I selected 47,25µm in machine settings!
Why does it change to 65µm by itself? It might have to do with swapping 2560x1440 to 1440x2560, but that does not give the same factor that will
make the slicer to go from 47,2 to 65µm??
Shahin, do you have an idea? Anyone?

I invested so much time to get nanodlp working, and this is the final problem that prevents me from having perfect prints...

Last edited by PhiMX (2019-05-15 10:38:32)

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#5 2019-05-15 14:48:55

PhiMX
Member
Registered: 2019-05-10
Posts: 21

Re: 2K 5.5" LCD image stretched

Ok, The resin profile has has an override which was set to 65µm for some reason, probably because I copied one of the existing profiles to change it to my likes, and I did not spot this tab.
Now, both x and y are set to 47.25, and hopefully it will be good.
Thanks to everyone!

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