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View Full Version : 3.5" LCD touchscreens: Now Available for $10 each.



Rayman
12-27-2009, 06:31 AM
My supplier for the 4.3" "used" touchscreens has about 1000 new 3.5" units that were never used...

Could be a nice chance to save them from the landfill...

Took a quick look at the datasheet and they appear very similar to the 4.3" units, but have an additional SPI interface.· Not to happy about needing extra pins, but perhaps this interface allows additional functionality...


Update:· Now for sale!· $10 each (+$5 shipping within USA)·

Email ray@rayslogic.com (mailto:ray@rayslogic.com) with your order...

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Post Edited (Rayman) : 1/22/2010 12:32:04 AM GMT

Luis Digital
12-27-2009, 08:01 AM
If you have money, buy everything, because if not sold today will be sold tomorrow.

Two important things:
- Do these LCD come with processor / memory integrated?
- The price. Less than $5? http://forums.parallax.com/images/smilies/tongue.gif

CassLan
12-27-2009, 08:13 AM
Rayman,

I'm just so amazed how you find these items at GOOD prices. I think your doing a great service to the prop community.

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NYC Area Prop Club (http://www.gothampropclub.com)

Prop Forum Search (Via Google) (http://search.parallax.com/search?site=parallax&client=parallax&output=xml_no_dtd&proxystylesheet=parallax&proxycustom=<HOME/>&ie=&oe=&lr=)

·

Ariba
12-27-2009, 08:56 AM
What is the pixel resolution? 320x240?

Can you post the datasheet?

Depending on the price, I am interested in a significant quantity of these displays.

Andy

Rayman
12-27-2009, 06:47 PM
resolution is 320x240. I just asked if I can post the datasheet...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

Ale
12-27-2009, 08:51 PM
Which kind of connector ?

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OMU for the pPropQL/020 propeller.wikispaces.com/OMU (http://propeller.wikispaces.com/OMU)

Rayman
12-27-2009, 10:33 PM
don't have one yet, but it looks like the same 60 pin connector that the 4.3" units have...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

Rayman
12-27-2009, 10:36 PM
This one looks to be more difficult to use though...

You need to supply +18 and -10V for the gate voltage as well as +5V for analog logic.
Also, you have to supply 6 capacitors.

So, it's more difficult.· Have to see if the price point makes it worthwhile...

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Luis Digital
12-27-2009, 11:34 PM
This apparently needs more control Pin and three voltage converters.
If the LCD has a module, maybe your supplier can give those parties, together with the connector. It would be a great savings.

And the plastic box with the brand erased. http://forums.parallax.com/images/smilies/smilewinkgrin.gif

Ale
12-28-2009, 12:17 AM
At least you do not have to provide all the gamma correction voltages... (I have such a module, a very nice 800x600 6" panel).
Two (maybe one) MC34063 can provide both potentials.

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pPropQL020: propeller.wikispaces.com/pPropQL020 (http://propeller.wikispaces.com/pPropQL020)
OMU for the pPropQL/020 propeller.wikispaces.com/OMU (http://propeller.wikispaces.com/OMU)

Rayman
12-28-2009, 03:54 AM
Here's a single chip solution for the voltages:

http://focus.ti.com/lit/ds/symlink/tps65120.pdf

Unfortunately, it's QFN, not one of my favorites, and with tiny pitch too... :(

Hopefully, I can find something similar in an nicer easier to solder·package...


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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

Post Edited (Rayman) : 12/27/2009 9:00:10 PM GMT

Rayman
12-28-2009, 03:56 AM
Good News!· Price·looks like it could be in the $10 range!

Also, got a green light on the datasheet, so here it is:

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

mctrivia
12-28-2009, 05:15 AM
The qfn is not a problem but the breakout would cost more making it almost the same price possibly more then the 4.5" display

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24 bit LCD Breakout Board now in. $21.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

Rayman
12-28-2009, 05:19 AM
True, but these are brand new displays. Also, the 4.3" maybe too big for some applications...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

mctrivia
12-28-2009, 05:25 AM
I can do cheaper if making 1000 if they can all be sold.

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24 bit LCD Breakout Board now in. $21.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

Rayman
12-28-2009, 05:31 AM
The one thing that the datasheet doesn't seem to expand too much on is the meaning of all the registers you can set via the SPI interface...
Hopefully, we can figure out what they all do... I'm hoping they will let you do things like change scan direction so you can rotate the display more easily...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

Ariba
12-28-2009, 07:16 AM
Google found this C code with some SPI commands to initialize the display.
The controller IC seems to be a S6F2002, but I don't find a datasheet.

All in all this display is much more complicated than the 4.3".

C code: tomoyo.sourceforge.jp/cgi-bin/lxr/source/drivers/video/backlight/ltv350qv.c (http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/drivers/video/backlight/ltv350qv.c)
Register definitions: tomoyo.sourceforge.jp/cgi-bin/lxr/source/drivers/video/backlight/ltv350qv.h (http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/drivers/video/backlight/ltv350qv.h)

Andy

Rayman
12-28-2009, 08:26 PM
I saw something about one register allowing to switch from DE mode to sync mode... I'm hopeful that that will remove the need for a DE pin. I think that will make the pin count the same or close as with the 4.3" units...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

blittled
12-30-2009, 06:54 AM
Sounds like an interesting display. It probably would interface well with the Chameleon-Pic since it has 2 user definable SPI interfaces.

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Will work for Propeller parts!

Rayman
01-12-2010, 08:56 PM
Just got word that 100 of these displays have been shipped to me!

Again, these are very interesting because there are ~1000 brand new ones available for a very low cost...

If anyone wants to help develop a breakout board, let me know...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

mctrivia
01-12-2010, 09:01 PM
I can do it if you like.

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

Rayman
01-13-2010, 09:13 PM
mctrivia: Ok, I'll send you a couple when they come in...

Was looking at TI power chips again yesterday...·The QFN16 ones that look like the best fit.
Probably should check out what other companies are selling too...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

Rayman
01-16-2010, 01:57 AM
Just got two boxes of 50 units!

They do indeed look brand new.

It does appear that the same 60-pin connector I've been using for the 4.3" units will work with these too...
(rather convenient).

The FPC cable is a bit on the long side, compared to the 4.3" units.· It's also much thinner and without ground plane.
I think that's because it doesn't have any components on the FPC cable...





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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

Rayman
01-22-2010, 07:35 AM
I've just put these displays up for sale on my website for $10...
Haven't made a breakout for them yet, so I don't have any way to test them.
But, they are brand new, so that's not so important...
Hope to have a prototype breakout board in the near future...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

Harley
01-22-2010, 08:35 AM
Rayman,

Is there any documentation on the 3.5" LCD yet?

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Harley Shanko

Rayman
01-22-2010, 09:35 AM
Just the datasheet (posted in this thread) and some code some nice people found....

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

mctrivia
01-27-2010, 09:18 AM
is this right? data sheet says frame rate is 60-90Hz that will be dificult on a prop.

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

Rayman
01-27-2010, 09:26 AM
Naw, it's easy because there's only 240 vertical lines... VGA driver does 480 vertical at 60 Hz with one cog...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

mctrivia
01-27-2010, 10:10 AM
ok good. Well I should be able to make the break outs for the same price as the 4.5 break out. $24.99


Any requests on connector?

I was thinking a 40 pin dip connector designed to fit under the prop dip chip. Would be 6 bit color only.

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

Rayman
02-03-2010, 11:50 PM
Just found some very interesting info doing a web search!

Looks like the STK1000 uses a very similar, if not identical 3.5" LCD.

And, they've posted complete schematics for how to power it here:
http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3918


I think I realize what that "M" output is for now...

This should jump start board development!

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

jazzed
02-04-2010, 12:25 AM
The dimensions on this display are perfect for an enclosure/keyboard on my desk.
There's a reference design .rar file here: en.pudn.com/downloads136/doc/project/detail582023_en.html (http://en.pudn.com/downloads136/doc/project/detail582023_en.html)
Login required to download :(

mctrivia
02-04-2010, 01:01 AM
I will double check my design and order a proto type run. You said there were 1000 to make right?

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

Rayman
02-04-2010, 01:25 AM
Well, I'm told there are 1000 available. I have 97 (I just sent you 3 samples). I want to make a Prop-powered board for it too, but haven't started yet (maybe I'll wait for Prop2).
Making 1000 of anything is much further out on a limb than I would go!

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

mctrivia
02-04-2010, 01:27 AM
If you have screens and prototype work I would get a lot of pcb to make cheap.

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

mctrivia
02-05-2010, 02:26 PM
ya vcom and m are a bit of a pain to deal with. oh well. break out will deal with it so you will not have to.

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

mctrivia
02-06-2010, 06:57 AM
Wow there are a lot of parts needed. Here is the part placement for the breakout. I am looking forward to testing this board out.

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

Rayman
02-06-2010, 08:30 AM
I was thinking that another way to go would be to supply the breakout as a 40-pin DIP...
Just an idea, probably not a good one...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

mctrivia
02-06-2010, 12:37 PM
I thought of that. This way is compatible with 4.5". I also have my universal adapter board wich will take either screen or almost everything else.

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

mctrivia
02-06-2010, 12:41 PM
with a 4 layer i could fit the power supply nicely on the back and shrink to almost same size as 4.5" breakout but that would make more expensive pcb and more expensive assembly.

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

Rayman
02-07-2010, 03:48 AM
mctrivia said...
Wow there are a lot of parts needed. Here is the part placement for the breakout. I am looking forward to testing this board out.


Nice work!·· You might think about a Propeller Platform version of this breakout...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

mctrivia
02-07-2010, 03:55 AM
I have look at thread

Name that board (http://forums.parallax.com/showthread.php?p=876882)

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

Post Edited (mctrivia) : 2/7/2010 3:41:41 PM GMT

mctrivia
02-26-2010, 12:23 AM
just a quick update. My pcb for my prototype run of breakout's arrived today and the 34373 parts I purchase so I could assemble them(aren't minimum quantities a pain) should hopefully arrive Friday, but likely Monday.

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

Rayman
03-02-2010, 08:35 PM
I'm looking forward to getting these 3.5"·touchscreens working!

This size and the 320x240 resolution are a good fit for many projects, I think.

Guess it's about time for me to start designing a Prop based controller for these things...



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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

mctrivia
03-02-2010, 11:06 PM
I got all my parts in yesterday. Soldered them all in place and powered it up without a display to test the voltage rails.

Unfortunetly none were right and the back light driver got very hot. So tomorrow I will have to start trying to figure out why.

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24 bit LCD Breakout Board now in. $24.99 has backlight driver and touch sensitive decoder. (http://forums.parallax.com/showthread.php?p=848975)

If you have not already. Add yourself to the prophead map (http://www.frappr.com/?a=constellation_map&mapid=137440632850)

Vaati
03-02-2010, 11:11 PM
Do you still have those touchscreens? I would love to get one...

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Quit buying all those fixed voltage regulators, and·get an Adjustable Power Supply (http://www.gadgetgangster.com/130)·for your projects!· Includes an LED testing terminal!

(no longer new) SD Card Adapter (http://www.gadgetgangster.com/158)·Now available!· Add extra memory to your next Propeller project with ease!

Rayman
03-02-2010, 11:21 PM
Vaati: I have a lot of them! But, we don't have a working breakout or driver board for them yet...

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My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

Stephen Moraco
03-03-2010, 01:43 PM
@mctrivia, @rayman,
Now that I have the LCD's I'm excited to get them working as well.
The breakout board seems to be progressing...
Anything I can do to help? "I'd make time" http://forums.parallax.com/images/smilies/wink.gif

-Stephen, KZ0Q

Rayman
04-07-2010, 06:48 AM
Ok, I think it's time I got serious about a board for these things! I'll give mctrivia a little more time to come up with a breakout board... In the meantime, I'm trying to get myself excited about a Prop powered board for these low cost 3.5" touchscreens...

I just had the idea of making a Propeller Platform compatible board. That is, a board with all the features of the Propeller Platform, but also with LCD interface, touchscreen chip, and backlighter. This way, people can leverage the wide array of "shields" for the Prop Platform...

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My Prop Info&Apps: ·http://www.rayslogic.com/propeller/propeller.htm

My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

bambino
06-29-2010, 07:31 PM
Rayman,
Do you have any postable info on the size of the breakout board? I have an enclosure in mind and would like to know if it is going to fit!

Rayman
06-29-2010, 07:58 PM
Ok, maybe I should start a thread about the new PTP...

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Harley
07-01-2010, 03:19 AM
@ mctrivia

Did a breakout board for the 3.5" color LCDs Rayman is selling ever get laid out? I'm interested in several if not too costly. http://forums.parallax.com/images/smilies/yeah.gif

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Harley Shanko

mctrivia
07-01-2010, 03:36 AM
Yes but there is a minor error I need gp figure out.

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Lots of propeller based products in stock at affordable prices. (http://propmodule.com/catalog/ref.php?refid=c81e728d9d4c2f632)

Harley
07-01-2010, 03:54 AM
@mctrivia,

Great. Any guesstimate on pricing and availability after you catch the 'bug'?

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Harley Shanko

mctrivia
07-01-2010, 03:57 AM
Not at the moment. I will relook over everything Friday. I can say I have designed a nice plastic enclosure for both this screen and the 4.3" screen

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Lots of propeller based products in stock at affordable prices. (http://propmodule.com/catalog/ref.php?refid=c81e728d9d4c2f632)

JackBak
07-03-2010, 12:37 AM
mctrivia,

Similarly interested in the break-out-board as I picked up a 3.5" LCD at UPEC from Ray.

Harley
07-03-2010, 09:35 AM
@ mctrivia, hopefully the breakout board problem isn't too difficult to find and fix.

Wishing you quick find, and fix. http://forums.parallax.com/images/smilies/yeah.gif

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Harley Shanko

Harley
07-09-2010, 02:26 AM
@ mctrivia, I trust you have found the bug(s)? Hadn't heard a peep how things are going for a while.

Even though I ordered the PTP, I'll be looking for 2-3 breakouts when available. The PTP makes for a 'painless' prototype board for my needs right now. But much more than ultimately will need.

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Harley Shanko

mctrivia
07-09-2010, 02:42 AM
i think the problem is my power control chip is fried. I am pretty sure I have a spare around here some where but I will not be able to get to finding until this monday coming up. Sorry I have been so slow with this. Time and money are greatly against me.

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Lots of propeller based products in stock at affordable prices. (http://propmodule.com/catalog/ref.php?refid=c81e728d9d4c2f632)

Rayman
07-09-2010, 04:50 AM
It would be nice to have a dedicated breakout board for this display...

But, I do offer a "shield build" of the PTP at a pretty low cost, which can be used as a breakout board. You can also just mount it on top of a Propeller Platform (if you have one) and getting it going without running any wires...

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My Prop Apps:· http://www.rayslogic.com/propeller/Programming/Programming.htm

My Prop Info: ·http://www.rayslogic.com/propeller/propeller.htm
My Prop Products:· http://www.rayslogic.com/Propeller/Products/Products.htm

Harley
07-09-2010, 05:31 AM
@ mctrivia. I didn't mean to sound like I'm in a big hurry. And don't know about your situation and the problem. Yes, some problems aren't easy to determine if one doesn't have a stockpile of parts.

As I said, I do have the PTP board to prototype with. That will take me a long way. Looking forward to hearing when you do kill the 'gremlin'.

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Harley Shanko

mctrivia
07-09-2010, 05:34 AM
Well I am glad to here that. I have a few gremlins to kill. I want to get a bunch of boxs for these screens made up but my CNC keeps stoping part way through. and my wife's birthday is Saturday so nothing electrical will be happening this weekend.

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Lots of propeller based products in stock at affordable prices. (http://propmodule.com/catalog/ref.php?refid=c81e728d9d4c2f632)

Rayman
03-04-2011, 08:57 PM
Chuck from Mountain King Technologies just sent me a laser cut acrylic enclosure for the PTP.

I know I made it very difficult for him with the board layout... But, somehow, he pulled it off.
As a bonus, it's also a 3D puzzle :), but it only took me 15 minutes to solve it...

Anyway, great job Chuck! And thanks!

David Betz
03-04-2011, 09:11 PM
That looks pretty cool. Is it for sale? Do you have a URL for Mountain King Technologies?

Edit:

I found it myself. I made a typo in my first Google search which is why I didn't find it right off the bat.

Here's the URL:

http://www.mountainkingtech.com/

Rayman
03-05-2011, 12:28 PM
BTW: I've started looking into ways to use these screens with less pins...
One thing I noticed right away is that the VSYNC and HSYNC signals aren't really used in the mode the driver defaults to: "DE" mode.

Anyway, if you want to recover P16 and P17 for other purposes, use the the driver in the attached example.

If I ever to a redesign, I think I can recover even more pins. In that case, I'll use P16 and P17 to increase the color depth from 6-bit to 8-bit. That will expand the color range past the TV driver...

avsa242
03-05-2011, 03:58 PM
I just got one of these, too, in the fluorescent blue color. The build instructions seemed a bit tricky to digest at first, but it looks fantastic when it's put together and it's so nice to finally have a home for the PTP! Thanks a lot Rayman for the PTP and thanks Chuck for the enclosure!

Cheers,
Jesse

Duane Degn
03-05-2011, 05:54 PM
Here's a picture of my PTP in its home.

78979

There's a second Prop in there to monitor the keypad, encoders, RF link, Wii Nunchuck connector, etc.

It's main purpose is to control some custom lab equipment but I also use it to control robots and soon TVs and and other IR devices.

There is room in there for a battery, I just haven't put one in yet. (Probably a two cell LiPo.)

I know a keypad is redundant on a touchscreen, but hey, I like buttons.

Sorry about the picture quality. If I used a flash, it washed out the screen.

Duane

Rayman
03-06-2011, 11:12 AM
Duane, looks neat, thanks for sharing the photo!

I'd also like to do a touchscreen remote control someday...

RS_Jim
03-06-2011, 12:10 PM
Ray,
are these still available?
RS_Jim

Rayman
03-06-2011, 02:26 PM
Yes, very. See my website for more info. I've also started shipping the "PTP shield" to GadgetGangster.com to sell...