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hello,
I'm using a OLED character display (NHD-0420CW-AB3) for a R n D project. but I have a problem of burn in images were displayed on some parts of the display screen. I have changed the contrast to the lowest value using the command but the problem occured. Also the lowest contrast also too high. we are going to buy some bulk quintity. but the issue is the burn in images occured for a few month of time interval since first use. How can we control the life time of pixels evenly and is there any solution or recommendations to solve that.also we need more control o the brightness of the display. Thank you.
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OLEDs / OLED for a large viewing distance
« Last post by UsherBhai on Today at 12:54:38 AM »
Hello everyone,,
I am looking to buy a TV for my house but unfortunately my viewing distance is fairly long... like 15 feet long. Is it worth it to get a 65 OLED or do I need to get something bigger? Unfortunately OLED will be out of my budget in the 75+ range

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Character LCDs / Re: Weird contrast on NHD-0216HZ-FSW-FBW-33V3C?
« Last post by LCD_DUDE on February 21, 2019, 10:18:23 PM »
Thanks for the swift reply!

The voltage for VDD is 3.3V in my circuit. The microcontroller also operates on 3.3V so all communications are at the same voltage too.

The backlight is on the same supply. I'm using a 50 ohm current limiting resistor as I didn't need the back light too bright.

I probed the supply rail with an oscilliscope before and after the problem started - Before, the voltage was clean and steady. After, VCC is pulled down by ~.3V almost everytime commands/messages are clocked onto the datalines. I saw this behavior even with the ISP connected which has a very significant power source available (i think it can supply something like 1A?) 

Cheers,
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Character LCDs / Re: Weird contrast on NHD-0216HZ-FSW-FBW-33V3C?
« Last post by Ted_M on February 21, 2019, 02:12:55 PM »
Please confirm the voltage for VDD is 3.3v.  If the LED backlight is also connected to the same 3.3v source, please check the current drawn by the LED.
In order to provide a constant current source of 15mA to the LED backlight from the 3.3v supply, a 20 ohm resistor must be in series with the LED.
Otherwise, excessive current draw from the LED could have an effect on VDD and possibly be causing this issue.

Best Regards,
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Character LCDs / Weird contrast on NHD-0216HZ-FSW-FBW-33V3C?
« Last post by LCD_DUDE on February 21, 2019, 03:20:42 AM »
Hey all,

I've been prototyping with a few 16x2 character 3.3V displays (NHD-0216HZ-FSW-FBW-33V3C) and had some unusual behavior with contrast.

The display starts out great (good contrast and sharp characters, etc) but after a few mins of use and a little bit of handling, power on/off cycles, etc, I'm finding the contrast starts acting funny.

All the pixels start to fade in a random pattern/gradient, totally non-uniformly distributed across the whole display. At times, it becomes so light that it is hardly visible. Power cycling does not fix the issue, nor does resetting the microcontroller i'm using to drive the module.

Per the datasheet, pin 3 (typically contrast) is listed as NC, so I've left if floating. there is no contrast pin listed so presumably it's a fixed contrast design? Could anyone confirm that pin 3 should float on this specific part number?

I'll add a picture to this post to show what i'm seeing, check it out.

Here is some background info:
1. LCD is mounted to a panel and wired to a breadboard

2. I'm using 4-bit mode and getting everything I want to show up on screen, so the issue does not appear to be caused by code or wiring on data lines.

3. The backlight is illuminated and steady, no flickering.

4. I've considered the refresh rate of my code, this issue persists with static displays.

5. 2x units have shown this behavior, first one acted up soon after plopping down onto a table, second one started when a hot ISP programming header was de-mated, removing power. Perhaps it's something to do power being removed midway thru communications with the MCU? or an interrupted VCC or GND connection? is it likely a power interruption would cause damage that creates these symptoms?

6. I measure 0.23V on pin 3 in the latest unit showing this issue.
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OLEDs / Re: 3D model - NHD-0216AW-IB3
« Last post by garbage98 on February 20, 2019, 11:37:13 AM »
Thanks!
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OLEDs / Re: Double Hight Font on a 763-NHD-0420CW-AW3 with Phyton on a Pi3b
« Last post by garbage98 on February 20, 2019, 11:31:49 AM »
I will look into it. Thanks!
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OLEDs / Re: Double Hight Font on a 763-NHD-0420CW-AW3 with Phyton on a Pi3b
« Last post by Ted_M on February 20, 2019, 09:43:43 AM »
The NHD-0420CW-AW3 OLED display has the US2066 controller/driver built in which does support Double-Height font characters.
The command table in the display's datasheet includes the instruction code on pg.8.

Please also refer to page 37 of the US2066 datasheet for more details. http://www.newhavendisplay.com/app_notes/US2066.pdf

See our Github for a US2066 library. https://github.com/NewhavenDisplay/NHD_US2066

Another Github link with python code for this display that may be useful:  https://github.com/wjskrydl/nhd-oled


Best Regards,
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OLEDs / Re: 3D model - NHD-0216AW-IB3
« Last post by Ted_M on February 20, 2019, 08:11:42 AM »
I have sent you an email with the 3D model of this display.  We will be adding it to our website for future reference.

Best Regards,
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OLEDs / Re: 3D model - NHD-0216AW-IB3
« Last post by garbage98 on February 20, 2019, 03:54:53 AM »
Could you provide a 3D model for the 763-NHD-0420CW-AW3 OLED display as well?
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