Author Topic: 16x2 OLED NHD-0216KZW-AY5 Intermittent, and perament vertical dots Brightness  (Read 4690 times)

BenB2013

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I have several  16x2 NHD-0216KZW-AY5  displays that have a permanent group, vertically aligned, that are brighter than the adjacent dots. The vertical brighter dots span both lines
These dots do not turn off completely when not addressed by a character, and show much brighter when addressed.

I have one display that is i ntermittent with this same action. One minute it will be normal, the I will get a vertical series thta donot fully turn off.

Is this a temperature issue?

Intermittent unit running at 31 deg C inside an instrument cabinet

The permanent units, came back from a field trip, where they were operated at -30 Deg C

We have 55 units operating with the NHD-0216KZW-AY5 display, and only 4 have the issue.

any help would be appreciated

Ben

Michael_L

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Are the permanent units the only displays that were running at that temperature?  These displays work down to -40C so it should not be a temperature issue.
Please email nhtech@newhavendisplay.com to receive an RMA # to return the displays back to us for analysis.

BenB2013

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Hi Michael,  thanks for the input and replay

Of the permanent units, we sent out 14 instruments, all were used over a 30 day period, in very cold weather. Cannot say if all saw -30 to -35 deg, but most did. The intermittent one, is new, has not seen -30 deg C. Just testing in the shop.

WE retrofitted the instruments from LCD's to the OLEDS, because of much improved cold weather operation, with lower power requirements. These instruments are battery powered.

The displays are hard wired onto a motherboard, so sending displays to you would be a major effort. Not contemplated as yet.

We plan to use these units again this season ( Seismic season in Alberta is typically September to March ). They are readable, but if they get worse, meaning more than one line of dots, I will replace them, and send them to you.

I was hoping that there was some info as to the reason for this.
Am I the only one who has this issue? that would be surprising..

We would like to see a 16x2 display like this, that was brighter, better sunlight readability . We have had comments from field personnel, on how difficult they are to read, when the sun is out on a white snow day. I find, that wearing polarized sun glasses helps, but a brighter display would also be good..

I would assume it is more than a resistor that dictates the brightness.

Can the brightness be changed, higher, with maybe a decrease in potential lifetime?

Thanks

Ben

Michael_L

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I assume you are supplying the display with the correct voltage and logic, and your timing is within spec.  I have not heard of this issue you are experiencing, but if it is possible to safely remove the display from your motherboard please email us requesting an RMA #.  Otherwise, it may just be easier for you to purchase a few replacement displays.

As for brightness, the display's brightness can not be increased.  If direct sunlight readability is an important feature, I would suggest using a transflective character LCD module such as the 2x16 K1Z series LCDs, here: http://www.newhavendisplay.com/advanced_search_result.html?y=0&x=0&keyword=NHD-0216K1Z&search_in_description=1

BenB2013

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Hi Michael,

I have just assembled a new instrument, and the OLED display lit up as the photos attached.

This is new purchase.

The display is being fed from a regulated +5.0 vdc, source, MIC5209-5.0 LDO regulator. Logic communication is through "SPI" mods made on the back as per Newhaven instructions.

Please remember, I have now about 61 of these instruments, of which now 5 units have this issue, with this last one being the worst, and happening right out of the box.

I will remove, and replace the last unit, since I cannot send this display to the field looking like this,

Your suggestion of using LCD's sunlight readability is not a solution for us, we replaced 50+ 16x2 LCD's with the 16x2 OLED's, because of cold weather performance, and power consumption. In the wintertime, in Alberta, the OLEDs perform better, consume much less power( no backlight LED to light ), due to diminished light ( short days ), and temperature.

Just need a brighter OLED display, 700-800 NITs would be nice,

I will be requesting an RMA for this last NHD-0216KZW-AY5 OLED Display to try to determine the issue here

Thanks

Ben

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