Can one change the backlight color of a dot matrix LCD ?

alex5

As far as I understand, dot matrix LCDs use a backlight LED that lights up the active display area through a optical guide. And this is located on the side. Shouldn't it be possible to replace it with another color?

Here's a dot matrix example:
https://newhavendisplay.com/128x64-graphic-lcd-module-fstn-display-with-white-backlight-with-negative-voltage-2x10-header/


COG:

https://newhavendisplay.com/128x64-graphic-cog-lcd-fstn-negative-display-with-white-backlight-mounting-holes/

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Comments

4 comments

Date Votes
  • Saurabh_B
    Hi Alex,

    It is possible to use a different color backlight for these displays.
    This display for example has 3 different color LEDs (Red, Green, Blue), and the text on this display will appear in the same color as the backlight. You could also combine the colors together to produce a combination of the colors as well.

     
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  • alex5

    That works nice if the display has a RGB feature. But suppose I want a display with FSTN(-) 128x64 and the NHD-12864WG-FTTI-VZ#000 is the only one that matches that. But it only features a white LED backligtht, no RGB, and I need the red backlight. Is it possible to open and switch the physical LED used?
    That would make many more displays a possible choice.

    Because as I understand it. Most of these dot matrix displays uses a light guide which ends at the side where a LED is located. Thus it should be relatively easy to get to.

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  • Saurabh_B
    You are correct about many displays using a side backlight with a wave guide. You would be able to open the display and change the LED to RED, however this is not recommended.

    If you were to open the LCD there is a chance that the LCD will not operate normally when put back together. There is also a chance that the back of the display glass could also be damaged.
    Opening the display will also void our warranty.
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  • alex5
    Is there any way to get to, and replace the LED without removing anything that holds the actual glass substrate?
    I suspect the metal frame on the top is the one that holds the display glass in tight contact with the electrical connections.
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