Undergrad How to change the color of an LED?

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SUMMARY

The forum discussion centers on modifying an LED backlight from blue to green for a digital thermometer used in a vehicle. The user initially inquired about using a yellow bulb cover over a blue LED to achieve a green light, but was informed that this would not work due to the narrow spectrum of LEDs. The conversation evolved to discuss replacing the blue LED with a green one, highlighting the need for soldering skills and the correct polarity for installation. Users provided insights on sourcing the appropriate 3mm through-hole green LEDs and cautioned against damaging the diffuser during modification.

PREREQUISITES
  • Soldering skills for LED replacement
  • Understanding of LED polarity and specifications
  • Familiarity with LED types, specifically 3mm through-hole LEDs
  • Knowledge of LED backlight modules and their integration with LCDs
NEXT STEPS
  • Research how to safely replace LEDs in electronic devices
  • Learn about sourcing 3mm through-hole green LEDs from suppliers like Digikey
  • Explore DIY guides on modifying LED backlight modules for LCDs
  • Investigate the differences between LED types and their applications in backlighting
USEFUL FOR

Electronics hobbyists, DIY enthusiasts, and anyone looking to modify LED backlighting in devices, particularly in automotive applications.

  • #31
I wish that was a piece of plastic or a filter I could just stick ontop of the blue display to change it to green. I know I'm dreaming.
 
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  • #32
Jackie1 said:
I wish that was a piece of plastic or a filter I could just stick ontop of the blue display to change it to green. I know I'm dreaming.
Look through a green bottle to make sure that you are only dreaming. If you see a green display then a plastic filter will work. If not, the LEDs in the device are not suitable. But you just have to try.
 
  • #33
I'm getting more and more curious. Why does it need to be green?
 
  • #34
DaveC426913 said:
I'm getting more and more curious. Why does it need to be green?
What? Who doesn't like green? :smile:

I imagine it's to match the other displays in the vehicle.
 
  • #35
DaveC426913 said:
I'm getting more and more curious. Why does it need to be green?
Authenticity, I reckon. Same as the colours of paint used on renovated vehicles. Plus, white / blue are not very restful colours when driving at night. In many ways, green is fave Dave.
 
  • #36
Ah. I was assuming it was a bedside clock.
 
  • #37
trurle said:
I see. This is the "LED backlight module" intended to reduce light losses of LED. It can still work with discrete LED, although with complications. You need to:
1) Cut the existing LED clear from diffusor plate using knife or heavy-duty nail cutter.
2) Either use "right angle" packaged LED, or bend leads of your LED to look sideways into diffusor panel
3) Connect LED lens and diffusor plate with a drop of transparent acrylic or silicone adhesive (recommended)

Well trurle super helped me and I sent my led to him and he fixed it. Yes, I shipped it to him in Japan. No one could do this here in the USA that I could find and if I did it myself it would have been destroyed. Here’s a pic but I will get better ones later. Thank you trurle!

IMG_2648.jpg
 

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