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Critique my first PCB
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carl0s:
Thanks for the pictures. I have a couple of the 480*480 HX8379-C coming to have a play with.
I think because they are GRAM-less, they are operated in Video mode, where hsync and vsync is sent along with raw pixel data, so no tearing effect line is used.
The 320*320 panel that I have been using (st7796) has a GRAM/framebuffer and works in adapted command mode.
Check ST application note AN4860.
This is the same as my 800*800 ILI9881C screen, which I have not used yet because it requires 3 lane MIPI.
luiHS:
 
How are you doing with your tests with the round screens? I have already designed the PCBs to use the two 2.1 and 2.4 inch screens.

What I do notice when testing the 2.4 screen is that there is a certain Tearing effect, as if the TE signal was not being used, that makes when playing videos, when scenes with rapid changes come out, a certain cut is shown in the middle of the screen .

The 2.4 screen is much brighter than the 2.1 screen, and although it has less resolution, I think it looks better.

 





 
carl0s:
Hey Lui

Great work. I can see the tearing too..
Is that stm32F769 with mjpeg video? I think it looks great.

I have done zero work really. I am still playing with SSD2828 bridge for the 4-lane display. No real reason other than to not give up. but it's just a part time hobby for me and I'm just too tired in the evenings lately to do anything :)

I agree the 320*320 Panasys screen is great and bright.
What about the 480*480 one with the 0.2mm pitch connector? I have a couple of those, but no breakouts for the connector yet and not bothered about having a PCB made just yet.
carl0s:
Are you sending the TE enable DSI cmd? (DSI_SET_TEAR_ON)

I have found that I don't get any screen output without it.. not sure if I mentioned that on here previously.
luiHS:

--- Quote from: carl0s on September 19, 2019, 11:38:33 am ---Hey Lui

Great work. I can see the tearing too..
Is that stm32F769 with mjpeg video? I think it looks great.

I have done zero work really. I am still playing with SSD2828 bridge for the 4-lane display. No real reason other than to not give up. but it's just a part time hobby for me and I'm just too tired in the evenings lately to do anything :)

I agree the 320*320 Panasys screen is great and bright.
What about the 480*480 one with the 0.2mm pitch connector? I have a couple of those, but no breakouts for the connector yet and not bothered about having a PCB made just yet.

--- End quote ---

Yes, my PCB boards are with the 769, in addition to an SDRAM, SD card holder and backlight voltage booster.

About the connectors, the 320*320 2.1-inch screen needs a 0.5 mm pitch connector, and the 480*480 2.4-inch screen needs a 0.3 mm pitch connector. Both connectors available in Mouser.


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