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Topics - markdpend

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OLEDs / NHD-0420CW-AG3 Pixel Test
« on: June 03, 2015, 05:04:28 AM »
Hi, I built a few projects using the NHD-0420CW-AG3 OLED display a couple years ago and am now refurbishing them.  I want to see if the displays have any issues so I wrote a small routine to light up every pixel (sent 0xFF) in every position (all 80), as shown below.   It was on for less than a minute about 4-5 times.   I found a little burn-in and only 1 dead pixel in only 1 character (row 2, column 15).  You can't see the burn-in but you can see the dead pixel in the picture.  So far so good until I turned it on a couple minutes later (normal operation) and find a couple columns of pixels that now won't turn off.  Hoping it might be a saturation issue that would eventually subside, I waited about an hour but they were still there and that's when I took the pictures.  So I have some questions.  Did I damage the display turning everything on at once?  If so, is it repairable with either component(s) change (I'm handy with electronics) or maybe a software approach?  If I did damage it, is there a preferred way to test the pixels?  I've got 3 more old units I want to test but am reluctant to try this again.  Thanks.

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OLEDs / NHD-0420DZW-AB5 Pixel Issues
« on: April 21, 2015, 09:40:01 PM »
Hi,  The attached picture is a display about a year old.  The individual pixels are beginning to fade at random places.  Does anyone know if this is typical wearout for this technology?  Thanks in advance for any help.

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Customer Projects / Custom Call Blocker
« on: April 21, 2015, 12:23:21 AM »
I used Newhaven's NHD-0420DZW-XXX OLED displays (4x20) to make a custom call blocker.  The displays are very nice.  Below are yellow and green.  In two of the pictures, you can see custom icons that were easily made for this display.  Having color on a black background makes the display very sharp and especially crisp at night.  All have excellent contrast and are easily read in full daylight.  Because of the posting size restrictions for pictures, I had to downsize all of them and some appear more blurry than they actually are.  In addition, all of the displays still have their protective plastic cover.

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