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Ron Czapala
08-12-2011, 08:39 PM
I just got this 2 line x 16 character NewHaven LCD display from Jameco.

It has an RGB LED backlight and can be driven by serial TTL RS232, I2C or SPI.

The RGB LED is NOT controlled by communicating commands to the module - you just control it through four separate pins.

You can use PWM to obtain various colors or just use resistors for a static color combination.

You can see flickering in this video when using PWM to cycle colors but it really isn't noticeable to the human eye...

Also the Blue color is darker and bluer than it appears in the video.


Jameco link (https://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2118660_-1)


http://www.youtube.com/watch?v=wi8LIC_iEjg

Don M
08-12-2011, 08:45 PM
Ron- your video is marked private.

I have used several different displays from New Haven. They seem to be pretty reliable. They have an office just an hour and a half away from me.

Ron Czapala
08-12-2011, 08:47 PM
Ron- your video is marked private.

Sorry, I meant to make it "unlisted" - should work now...

piguy101
08-13-2011, 01:09 PM
So what's the price of the LCD display?

Gadgetman
08-13-2011, 01:20 PM
$23.95 for one, discounts starts at 5+ units, it seems, from Jameco's website.
(Checked the link posted just above the video)

Cool stuff!

Ron Czapala
08-13-2011, 01:46 PM
I wish the module was designed to control the RGB backlight via the serial interface and allow PWM signals for each color.

I am currently driving it with a BS2 Stamp.
To avoid issues with the 20ma per pin limitation (and 40ma total) I created a little board with 2N2222 transistors and resistors to handle the RGB LED.

http://forums.parallax.com/attachment.php?attachmentid=83988


83988

John A. Zoidberg
08-13-2011, 02:19 PM
These displays looks really like the things in the 70s. The smooth changing colour thing.

I remembered JVC has those little micro hi-fis which have displays just like these ones. Best of all, you can select the style of the changing of colours. Pretty funky!

However, can't find any of those in SE Asia. Hope they stock a bit on that one though. :)

Ron Czapala
08-13-2011, 03:33 PM
These displays looks really like the things in the 70s. The smooth changing colour thing.

I remembered JVC has those little micro hi-fis which have displays just like these ones. Best of all, you can select the style of the changing of colours. Pretty funky!

However, can't find any of those in SE Asia. Hope they stock a bit on that one though. :)

NewHaven also makes an RGB display where the font color is RGB with a black background

http://www.newhavendisplay.com/index.php?main_page=product_info&cPath=329&products_id=2649

83989

RDL2004
08-13-2011, 04:57 PM
I can't really comment on those particular displays, but have not been impressed with the negative type displays that I have used (light type on dark background). I have a Newhaven blue on black display and the brightness is pretty poor in my opinion. I also have a red on black I got from Sparkfun, it's not very bright either. They always look better in the photos than they do in real life. The only ones I've tried that I like are the white on blue, but in that case the background actually gives off a lot of light.

Ron Czapala
08-13-2011, 05:02 PM
I can't really comment on those particular displays, but have not been impressed with the negative type displays that I have used (light type on dark background). I have a Newhaven blue on black display and the brightness is pretty poor in my opinion. I also have a red on black I got from Sparkfun, it's not very bright either. They always look better in the photos than they do in real life. The only ones I've tried that I like are the white on blue, but in that case the background actually gives off a lot of light.

I have three of the SparkFun white on black serial displays (http://www.sparkfun.com/products/9395)and I really like them.
I usually set the brightness down a bit.

RDL2004
08-13-2011, 05:26 PM
It's not that bad. I guess my expectations were a little too high.

edit: and it does look better in this photo than in real life :)

HollyMinkowski
08-20-2011, 01:23 AM
I wonder if you could hack those 3.00 USD ebay
2 line LCD displays to be RGB?

If you look at the end it appears that there are 2 wires
going to an LED embedded in epoxy? What if you drilled
that out and hot glued a 20 cent RGB LED in there?

Maybe worth trying....

erco
08-20-2011, 01:44 AM
Serial is the only way to fly, even if they cost 10X more. I bought two of those cheap TOPWAY LCD parallel LCD displays off Ebay before I realized how many IO lines it takes to drive a parallel display. They are doomed to stay in my possession forever. Too good to throw away, too much of a PITA to ever actually use.

Don't we all have parts like that? What's YOURS?

HollyMinkowski
08-20-2011, 01:49 AM
I dead bug wire a tiny88 onto the back to create an
easier to use display...you can drive the display using
a single Prop pin once you make it a smart display.
total cost less than 5.00 USD

These would make a nice moneymaker for someone
who wanted to resell them on ebay. They are ugly
when viewed from behind but work great. I2C, one wire,
rs232..whatever you want to code for, or all of them.

Oh, and there is flash left over that you can store macro
text strings into....saves space on your uC flash or eeprom.

Ron Czapala
08-20-2011, 02:00 AM
Serial is the only way to fly, even if they cost 10X more. I bought two of those cheap TOPWAY LCD parallel LCD displays off Ebay before I realized how many IO lines it takes to drive a parallel display. They are doomed to stay in my possession forever. Too good to throw away, too much of a PITA to ever actually use.

Don't we all have parts like that? What's YOURS?

Some "Serial" displays are SPI and not RS232 - I really like the RS232.

NewHaven and Seetron are also selling OLED displays (parallel or SPI): http://www.newhavendisplay.com/index.php?main_page=index&cPath=119_576
Seetron OLED RS232: http://www.seetron.com/glo416.html

Don M
08-20-2011, 01:38 PM
I used a New Haven OLED in my recent project.

84278

Tom C
08-20-2011, 01:48 PM
erco,
Here is a link to a reasonably priced serial to parallel module to drive the parallel LCD displays: http://www.wulfden.org/TheShoppe/k107/about.shtml
Regards,
TCIII

Ron Czapala
08-20-2011, 01:58 PM
I used a New Haven OLED in my recent project.


Don,
Looks good! How does it compare to LCD displays in terms of sharpness and viewing angle? I guess OLED displays don't need a backlight...

RDL2004
08-20-2011, 02:02 PM
I don't use anything but the K107. You can actually buy the programmed chip alone directly from Prof. Anderson.

@ Don M Nice looking box.

I don't think I'll be happy with anything less than a VFD, but I cringe at the price.
I've heard the OLED type displays suffer from "burn-in" problems. I think I'll try one though just to see for myself because that one looks good.

bomber
08-20-2011, 04:16 PM
I am SO getting one of these!!!!!
By the way, would you mind posting your code?

Ron Czapala
08-20-2011, 04:46 PM
I am SO getting one of these!!!!!
By the way, would you mind posting your code?

I have attached some BS2 demo code. I use the little transistor driver card pictured above to drive the RGB LED backlight.

I created an enclosure a for the display and driver card

Here is the RL6015 project box (http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&KeyWords=HM1079-ND&x=27&y=22) at DigiKey and the Hammond Mfg link (http://www.hammondmfg.com/RL.htm)

http://forums.parallax.com/attachment.php?attachmentid=84281

84281

Don M
08-21-2011, 07:16 PM
Ron- The quality of viewing on an OLED is so much better than an LCD. Very bright and sharp. I have heard of the limited lifetime of OLED displays (don't know how long "limited" is) but the application I installed one on is not on all day every day. Should last a long time.

I had considered a 2x20 VFD as they are bright and sharp as well but I chose the OLED because it can run on 3.3 volts. VFD's will also wear over time. One could implement a "screen saver" time-out function in their code to help alleviate this.

BTW- I tried the K107 kit from Wulfden. Be careful as it did not work properly with a 2x20 VFD display and the New Haven OLED displays I had. It will not address the second line at all. I know that Mr. Andersons chips were made to work with the HD44780 protocol but these displays wouldn't work with it. The literature for the displays does not specifically mention that they are fully HD44780 compatible BUT these displays DO both work fine with the Parallax serial back-pack taken from one of their serial displays and they also work in direct parallel mode with HD44780 spin objects from the OBEX without any modification. I have sent a VFD to Brian Riley for analysis but am still waiting to hear his conclusion.

Ron Czapala
08-21-2011, 09:31 PM
I dead bug wire a tiny88 onto the back to create an
easier to use display...you can drive the display using
a single Prop pin once you make it a smart display.


@Holly

I sent you a PM with some questions about tinyAVR chips...

Thanks,
Ron

Ron Czapala
08-21-2011, 09:35 PM
Ron- The quality of viewing on an OLED is so much better than an LCD. Very bright and sharp. I have heard of the limited lifetime of OLED displays (don't know how long "limited" is) but the application I installed one on is not on all day every day. Should last a long time.

I had considered a 2x20 VFD as they are bright and sharp as well but I chose the OLED because it can run on 3.3 volts. VFD's will also wear over time. One could implement a "screen saver" time-out function in their code to help alleviate this.

BTW- I tried the K107 kit from Wulfden. Be careful as it did not work properly with a 2x20 VFD display and the New Haven OLED displays I had. It will not address the second line at all. I know that Mr. Andersons chips were made to work with the HD44780 protocol but these displays wouldn't work with it. The literature for the displays does not specifically mention that they are fully HD44780 compatible BUT these displays DO both work fine with the Parallax serial back-pack taken from one of their serial displays and they also work in direct parallel mode with HD44780 spin objects from the OBEX without any modification. I have sent a VFD to Brian Riley for analysis but am still waiting to hear his conclusion.

Don,
Thanks for the info - Did you try SPI mode?