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norbert-walter / esp32-nmea2000-obp60

nmea2000 gateway with ESP32
GNU General Public License v2.0
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E-Paper display fades when exposed to SUN #68

Closed W-Geronius closed 2 years ago

W-Geronius commented 2 years ago

Exposed to plain sun the display fades very quickly. As discussed before, a more effective UV/IR protection filter should be attached. For test purposes I ordered a free sample of https://www.semasorb.com/produkt/uva-sonnenschutzfolie-semasorb-dk400/ - I'll report about that

_The e-ink screen is recommended for indoor use. If it is used outdoors, it is necessary to avoid direct sunlight on the e-ink screen, and at the same time, take UV protection measures, because charged particles will dry out under strong light for a long time, resulting in loss of activity and failure to refresh. This situation is irreversible. When designing e-ink screen products, customers should pay attention to determine whether the use environment meets the requirements of e-ink screen_

Even the 'full refresh' (seemingly consisting of 2 consecutive redraws) doesn't improve display quality - while the first redraw restores normal contrast, the second (and final redraw) even decreases contrast. Attached video demonstrates that effect: refresh events occur at 10:55:49 and 11:05:49

Strange enough, the lower part of the screen appears to be less affected by decrease of contrast - it somehow looks like it 'recovers' from its extremely poor readability right after refresh.

To meet github max filesize (10MB) the video is optimized to minimal size and plays at 2x speed:

https://user-images.githubusercontent.com/18160302/172000047-2dcbc7e0-3172-4a29-9523-7eaf7e4ad943.mp4

OBP60 Display UV.mp4 zipped

Original video (~500MB, although not perfect too) is available upon request

The device was exposed to sun, quite hazy though - under clear sun condition the display fades even more quickly

W-Geronius commented 2 years ago

reminder from threema conversation image

W-Geronius commented 2 years ago

reminder to threema conversation: threema-20220624-115925547

promising results using IR filters

norbert-walter commented 2 years ago

IR radiation ist the problem on the display. The IR radiation heating up the black pixel and reducing the viscosity of gel layer between the glases. To resolf the problem we can using sunshine protection foil with UV and IR blocker. Several manufacturer has helpfully products. Products from 3M are the best.

Refer the resultrs:

Without protection: https://www.youtube.com/watch?v=m_Ud9td2hmo With protection: https://www.youtube.com/watch?v=_o3J9punhgE