Author Topic: 7 inch display for lichee nano  (Read 877 times)

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Online pcprogrammer

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7 inch display for lichee nano
« on: March 30, 2021, 06:51:46 am »
I'm looking for a 7 inch lcd for a lichee nano to do development for the scope but find it hard to obtain specifications of displays offered on aliexpress.

I asked the seller of this one (https://nl.aliexpress.com/item/32691414835.html) for a datasheet, but they don't have it |O
Searching on google does not render much info either.
I think it is a 50pin and might be the same as what is in the FNIRSI-1013D.

Anyone any suggestions or a pointer to a cheap (Less than 20 euro) 40pin 7 inch 800x480 lcd compatible with the lichee nano. Preferably on aliexpress.

See attached schematic of the lichee nano I found on the net
 

Offline SiliconWizard

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Re: 7 inch display for lichee nano
« Reply #1 on: March 30, 2021, 06:12:48 pm »
Looking at the docs for the Lichee nano (most of which is in Chinese), it seems to support 800x480 RGB LCD panels, among others, with optional resistive touchscreen.

Adafruit happens to have exactly that: https://www.adafruit.com/product/2353
They also have a version with a resistive touchscreen that the Lichee Nano seems to support as well: https://www.adafruit.com/product/2354 (but this one is out of stock.)

It does have the 5" version with touchscreen in stock though: https://www.adafruit.com/product/1596

Judging from the datasheets and the schematic you posted, the pinout of all those panels seems compatible. The datasheets are available on the above pages, so if you really want to find them on Aliexpress you can specifically look for the references. Although I wouldn't find this particularly fair for Adafruit, as I found those panels thanks to them.

« Last Edit: March 30, 2021, 06:14:40 pm by SiliconWizard »
 

Online pcprogrammer

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Re: 7 inch display for lichee nano
« Reply #2 on: March 30, 2021, 07:39:08 pm »
Thanks for pointing this one out to me. I was able to find same kind of information on vendor sites like Farnell and RS components with similar prices. Since it is hobby and does not generate income I have to try to buy cheap. The problem lies in trying to match the found information with what is offered on aliexpress.
 

Offline SiliconWizard

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Re: 7 inch display for lichee nano
« Reply #3 on: March 30, 2021, 09:07:34 pm »
I think it's a lost cause. The only panels that looked similar (but without datasheets, so you can never know) were on Alibaba. From $25 to $50 a piece. Do not expect anything cheaper than that. And sure, one at $25 would be half the price of Adafruit's (or Farnell's) ones, but without any documentation, is it worth trying to save $25, at best, while possibly getting something that won't work?

Do no expect this kind of panels (7", 800x480, RGB interface) to be particularly cheap anyway. Those are relatively uncommon these days, and have been largely replaced with ones with either MIPI or eDP (for larger ones) interfaces. Even the resolution is not that common anymore.
« Last Edit: March 30, 2021, 09:09:16 pm by SiliconWizard »
 

Offline Algoma

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Re: 7 inch display for lichee nano
« Reply #4 on: March 30, 2021, 09:15:40 pm »
There is a model number on the pictures in this article:  40pin RGB LCD would be the search term.
https://unframework.com/2020/05/27/setting-up-embedded-linux-on-lichee-pi-nano/

https://www.aliexpress.com/item/32656532585.html
 
4.3 inch seem reasonable price, the 7 inch is quite a bit more. 
« Last Edit: March 30, 2021, 09:34:15 pm by Algoma »
 

Online pcprogrammer

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Re: 7 inch display for lichee nano
« Reply #5 on: March 31, 2021, 06:14:30 am »
Thanks for the info. I know it is tricky to buy on aliexpress. And prices for LCD screens aren't that much better than from regular suppliers. I will take a gamble on this one: https://nl.aliexpress.com/item/32691414835.html. At 10 euro free shipping the loss is not that big if it does not work.

Probably have to make a converter board with some power supply stuff on it to get it to work. Chances are it is compatible with the display in the FNIRSI-1013D (The lichee nano project is intended as aid in developing new software for the FNIRSI) for which I reversed engineerded the schematic.
 

Offline Algoma

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Re: 7 inch display for lichee nano
« Reply #6 on: March 31, 2021, 06:19:17 am »
The lichee nano firmware (F1C200s) is also the foundation for the application processor in the new Hantek DSO2D10 scopes.
 

Offline ali_asadzadeh

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Re: 7 inch display for lichee nano
« Reply #7 on: March 31, 2021, 08:22:58 am »
Thanks blueskull for sharing, I use Techstar lcd as my main TFT supplier, what other Chinese brands do you recommend?
I'm a Digital Expert from 8-bits to 64-bits
 

Offline ali_asadzadeh

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Re: 7 inch display for lichee nano
« Reply #8 on: March 31, 2021, 07:49:40 pm »
Quote
Don't know many other than EastRising (which probably everyone else knows)
Thanks, I did not know them, do you have their official website and the place to buy form them?
I'm a Digital Expert from 8-bits to 64-bits
 

Online pcprogrammer

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Re: 7 inch display for lichee nano
« Reply #9 on: April 10, 2021, 07:44:02 am »
I received the display I bought (https://nl.aliexpress.com/item/32691414835.html?spm=a2g0s.9042311.0.0.27424c4dER5LsR) but it does not work with the FNIRSI-1013D. It shows some white fading and stabelizes in a blue bar on the right side of the display.

On the cable there is "7300130906 E231732 NETRON-YF P08 94V-0\1332"

Does someone have an lead to the specifications?
 

Online pcprogrammer

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Re: 7 inch display for lichee nano
« Reply #10 on: April 10, 2021, 09:39:27 am »
I made a video of what it does and posted it on youtube (https://youtu.be/K5SbKid2z_o)
 

Offline Algoma

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Re: 7 inch display for lichee nano
« Reply #11 on: April 17, 2021, 10:06:34 pm »
The Hantek DSO2D10 was reported to use a TM070RDH13 display connected to their Allwinner F1C200s (Firmware is based on LicheePi Nano) (if this information useful in anyway to track down a likely pinout).
 

Online pcprogrammer

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Re: 7 inch display for lichee nano
« Reply #12 on: April 25, 2021, 02:08:35 pm »
Not sure, but for the display I have, it is not the pinout. I need to find the correct settings for the scan frequency. When connected to the FNIRSI-1013D it seems to work, but due to wrong settings of the DEBE in the F1C100s it is not displaying correctly.

Once I have re-engineered the scope software I will have a go at changing the settings to see what it does.

I also found another display on aliexpress that is the correct one for the scope. Needs additional power to be connected to the lichee nano. Did not try that yet.

https://nl.aliexpress.com/item/32693491775.html
 


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