EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: dentaku on February 14, 2015, 08:54:52 pm
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I have one of those extremely common 16X2 LCDs that came with an Arduino starter kit.
It's blue with white letters because the backlight is white.
http://www.electronicoscaldas.com/333-large_default/display-lcd-16x2-el-1602a.jpg (http://www.electronicoscaldas.com/333-large_default/display-lcd-16x2-el-1602a.jpg)
It's held onto the PCB with 6 twisted metal tabs.
http://www.wayengineer.com/images/TFT/YX-1602A-1.jpg (http://www.wayengineer.com/images/TFT/YX-1602A-1.jpg)
If I open it up to see if I can simply flip a polarizing filter to reverse the colours will it be impossible to get everything back in the right position so the zebra strip connects properly?
Is there a thin polarized sheet in there like I'm assuming?
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the polarizer is typically glued to the glass. won;t work
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First of all it almost certainly is glued to the glass. Secondly you need to rotate the polarizer by 90o what is impossible because display is not square.
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First of all it almost certainly is glued to the glass. Secondly you need to rotate the polarizer by 90o what is impossible because display is not square.
Doh! You're right. I should have realised that :palm:
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If you have an old computer/laptop screen you don't care about that's lying around, a piece of the polariser can be cut out by hand. If you disassemble one the various layers fall out like a disused sandwich. I've used this to repair small LCDs with water-damaged polarisers before.
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First of all it almost certainly is glued to the glass. Secondly you need to rotate the polarizer by 90o what is impossible because display is not square.
Rotating the polarizer 90 degrees is not necessary. Just flipping it front-to-back should do the trick (assuming there is no glue involved).
When i was a kid i had a calculator whose LCD polarizer and glass were not glued. Long story short: When i accidentally placed the polarizer back-to-front after a teardown, the display was inverted. I kept it like that, because it made my calculator look cool... :)
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Is there a thin polarized sheet in there like I'm assuming?
Yeah. You may need to heat it up, however.
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First of all it almost certainly is glued to the glass. Secondly you need to rotate the polarizer by 90o what is impossible because display is not square.
Rotating the polarizer 90 degrees is not necessary. Just flipping it front-to-back should do the trick (assuming there is no glue involved).
When i was a kid i had a calculator whose LCD polarizer and glass were not glued. Long story short: When i accidentally placed the polarizer back-to-front after a teardown, the display was inverted. I kept it like that, because it made my calculator look cool... :)
That works only for circular polarization AFAIK.
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The LCD polarisers are typically placed at a 45 degree angle, so that they can be viewed by people using polarised sunglasses without taking them off. Those are horizontally polarised to reduce glare, the 45 degree angle makes the display still visible, even though it will be low contrast.