Sonsivri
 
*
Welcome, Guest. Please login or register.
Did you miss your activation email?
November 21, 2018, 12:00:57 00:00


Login with username, password and session length


Pages: [1]
Print
Author Topic: [Q] Display Recommendation Request for Embedded Application  (Read 1081 times)
0 Members and 1 Guest are viewing this topic.
biomed12
Junior Member
**
Offline Offline

Posts: 91

Thank You
-Given: 66
-Receive: 4


« on: February 24, 2018, 08:35:31 08:35 »

Dear All,

I have need some recommendations about this topic. I need a display about 4-7 inches which will be run on RTOS based embedded system.

Which platforms do you use? (Both displays and frameworks)

Thanks.
Logged
jumulab
Junior Member
**
Offline Offline

Posts: 53

Thank You
-Given: 75
-Receive: 54


« Reply #1 on: February 24, 2018, 01:05:25 13:05 »

Hi biomed,
for a first look, you can see the ST M32 F7 Discovery kit , STM32F746 or other else in their list of kit's with
graphic display. You have a lot of demos and example soft to start. ( see mbed applications for this kit)

Another option is the use of the new ( few years) Renesas Synergy platform, when you have a lot of professional
tools FREE. Take a llok at their web page and see.

Cheers!
Logged
mars01
V.I.P
Senior Member
*****
Offline Offline

Posts: 412

Thank You
-Given: 474
-Receive: 1105



« Reply #2 on: February 24, 2018, 01:38:37 13:38 »

Hi,

You might have a look at the Nextion displays. They are made by Itead (Chinese company).
You can buy them from eBay/Aliexpress and they are easy to use.
Only 2 pins are required because the communication is done serial via UART (Tx/Rx).
They have touch screen which might be a bonus.
There is an Enhanced edition which bring an internal RTC and have 8 GPIO that can be controlled directly from the display.
Only the 5" display have a variant with capacitive touch screen, the rest are resistive type, but quite sensitive.

They embed a graphic processor and they offer an application for building the GUI by drag and drop.
Depending on your application this might considerable simplify your work.

The downside is that the support (on their forum) is ... there is a guy there, an admin, that share information's but ... meah. He hopes to gain customers (he offer paid support) more than he wants to help.
Logged
biomed12
Junior Member
**
Offline Offline

Posts: 91

Thank You
-Given: 66
-Receive: 4


« Reply #3 on: February 24, 2018, 03:02:01 15:02 »

Hi biomed,
for a first look, you can see the ST M32 F7 Discovery kit , STM32F746 or other else in their list of kit's with
graphic display. You have a lot of demos and example soft to start. ( see mbed applications for this kit)

Another option is the use of the new ( few years) Renesas Synergy platform, when you have a lot of professional
tools FREE. Take a llok at their web page and see.

Cheers!

Dear jumulab,

I need more than eval kits.

Thanks.

Posted on: February 24, 2018, 09:37:11 21:37 - Automerged

Hi,

You might have a look at the Nextion displays. They are made by Itead (Chinese company).
You can buy them from eBay/Aliexpress and they are easy to use.
Only 2 pins are required because the communication is done serial via UART (Tx/Rx).
They have touch screen which might be a bonus.
There is an Enhanced edition which bring an internal RTC and have 8 GPIO that can be controlled directly from the display.
Only the 5" display have a variant with capacitive touch screen, the rest are resistive type, but quite sensitive.

They embed a graphic processor and they offer an application for building the GUI by drag and drop.
Depending on your application this might considerable simplify your work.

The downside is that the support (on their forum) is ... there is a guy there, an admin, that share information's but ... meah. He hopes to gain customers (he offer paid support) more than he wants to help.


The nextion looks like best solution. Thanks.
Logged
Gallymimu
Hero Member
*****
Offline Offline

Posts: 689

Thank You
-Given: 151
-Receive: 202


« Reply #4 on: February 24, 2018, 05:49:55 17:49 »

biomed, you should provide more info.  Is this for production or just for prototyping?  What are your volumes?  Do you have a cost target? 

Some of the suggestions would be wildly inappropriate if this is mean for a product with volumes in the 10s of thousands or more (as you would want to go with a raw display for a low cost)
Logged
bigtoy
Active Member
***
Offline Offline

Posts: 197

Thank You
-Given: 196
-Receive: 257


« Reply #5 on: February 24, 2018, 07:20:49 19:20 »

Take a look at buydisplay.com  We use their displays for different projects powered by microcontrollers. Many of them have controller chips built in, so you can talk to them using SPI and various other interface modes. They have a variety of different sizes, and you can order them directly off their website. They're in China so prices are good, and many of the displays have guaranteed long-term supply. They also have sample schematics, sample code, etc on their website to help get you started. We've used both TFT and OLED displays from them.
Logged
biomed12
Junior Member
**
Offline Offline

Posts: 91

Thank You
-Given: 66
-Receive: 4


« Reply #6 on: February 25, 2018, 06:40:37 06:40 »

biomed, you should provide more info.  Is this for production or just for prototyping?  What are your volumes?  Do you have a cost target? 

Some of the suggestions would be wildly inappropriate if this is mean for a product with volumes in the 10s of thousands or more (as you would want to go with a raw display for a low cost)

We need a solution that is approptiate mass production(about 3000 products/year). I think, solutions up to 20$ was perfect for us. Oled is a plus but LCD also OK. Touch panel is a mandatory also. The screen size should be between 3-5 inches.lastly, the very very important factor is software library support.

Posted on: February 25, 2018, 01:37:36 13:37 - Automerged

Take a look at buydisplay.com  We use their displays for different projects powered by microcontrollers. Many of them have controller chips built in, so you can talk to them using SPI and various other interface modes. They have a variety of different sizes, and you can order them directly off their website. They're in China so prices are good, and many of the displays have guaranteed long-term supply. They also have sample schematics, sample code, etc on their website to help get you started. We've used both TFT and OLED displays from them.

"They also have sample schematics, sample code, etc on their website to help get you started." This was the best part of your recommendation bigtoy. Thanks.
Logged
Gallymimu
Hero Member
*****
Offline Offline

Posts: 689

Thank You
-Given: 151
-Receive: 202


« Reply #7 on: February 25, 2018, 08:34:33 08:34 »

OK, at those volumes you may want to work with a big distributor like Avnet or Arrow or whoever is in your country.  I would go to companies like Sharp (that's who we used on our last medical console) through the distributors to get glass, and have a touch screen laminated/bonded to suit your needs.

Also, depending on the life of your product (we are typically working with 10 product lifecycles).  You want to make sure you are sourcing a display indicated for long product life.  Many LCDs have life cycles of only a couple of years.

That said if something cheap from buylcd suits your needs go for it.  I've not tried to use them for production designs.

One of the problems with displays at low volume is that most of what you can access is crap: poor contrast, poor viewing angle, weak color, low resolution.  We lucked out on the last one we did with sharp as, even with a capacitive touch overlay it looked pretty good still.  Not quite cell phone quality but not too far off.
Logged
crahak
Active Member
***
Offline Offline

Posts: 106

Thank You
-Given: 8
-Receive: 443


« Reply #8 on: February 26, 2018, 09:27:46 21:27 »

You still haven't mentioned much about your embedded platform. We have no idea what the MCU is or what it can do, what resources are available, or much of anything to make a good recommendation.

So you're looking for:
-a large-ish display (4" to 7")
-a high quality display
-touch
-something where someone did 99% of the necessary work for you ("software library support", not just schematics, datasheets and such)
I think, solutions up to 20$ was perfect for us
-and on a $20 budget (!!!)

You'll quickly find that *nothing* exists that fits these criteria. You have several options that actually exist:

-There's super cheap LCDs that are small and not so good (with the the usual ilitek, solomon systech, sitronix, etc) and mainly with community support. Here we're talking like < $10, 2.x", and resolutions around 320x240, and again, so-so quality. Libraries? You'll find arduino stuff all over the web if that's your thing but that's mainly it. There's no real vendor support. Nobody is gonna be really impressed at how those look outside of hobbyist projects...

-There's traditional TFT LCDs, with either a classic parallel RGB or LVDS encoded signal (colors, sync, pixel clock). Your processor will need to have the right interface. Your OS (Linux, Android, WinCE, etc) will typically have everything you need for graphics. Prices are very competitive (SHARP is pricey and doesn't include touch, TIANMA are cheaper and offer touch, but chinese companies like OSD are quite a bit cheaper still). Great resolutions, large sizes, great quality and all (it's what's in most of your electronics like your laptop or LCD monitor) , and for decently cheap. With a MOQ of 1000, you could get something like a 4.3" 480x272 with touch, with a FFC/FPC cable from OSD (TIANMA would be more and can discontinue stuff/be a problem to order; SHARP will cost similar but have no touch so that's extra $). Again, if you don't have the right interface, then this option ceases to exist altogether. If your PCB person isn't really good or if your design sort of sucks (poor PDN/layout/decoupling at certain frequencies), trace impedance isn't well controlled (proper stackup and all), and you're not familiar with controlling EMC (FCC testing) then you're 99.999% likely to fail tests (most likely radiated emissions, on the 3rd harmonic of the pixel clock), possibly still failing after months and several redesigns and kludges (and tens of thousands of $ wasted, project is now late to market, etc)

-Otherwise you're left with solutions where someone did 99.999% of the work for you, like nextion. There's no need to pick an LCD panel, plan your project to have the necessary hardware resources (spare ports of the right type, enough memory for frame buffers, enough flash left for all the heavy graphics, etc) and nobody needs to spend months or years writing graphics code and necessary "other" stuff (like how to store that on some file system and update it later). There's WYSIWYG editors that use built-in libraries. Everything runs on another processor on the LCD's PCB, using it's pixel clock interface/SPI/I2C for LCD panel, touch panel and storage. That adds a fair amount of cost (you're paying for the software development, the extra PCB, processor, memory and all). The 4.3" unit is $45 and the 7" is $75.

You can't have a everything-included solution (both hardware and software) like nextion without paying for the extras.
Logged
Pages: [1]
Print
Jump to:  


DISCLAIMER
WE DONT HOST ANY ILLEGAL FILES ON THE SERVER
USE CONTACT US TO REPORT ILLEGAL FILES
ADMINISTRATORS CANNOT BE HELD RESPONSIBLE FOR USERS POSTS AND LINKS

... Copyright 2003-2999 Sonsivri.to ...
Powered by SMF 1.1.18 | SMF © 2006-2009, Simple Machines LLC | HarzeM Dilber MC