Newhaven Display Forum

Newhaven Products => Graphic LCDs => Topic started by: alex5 on May 07, 2016, 03:58:05 PM

Title: Can one change the backlight color of a dot matrix LCD ?
Post by: alex5 on May 07, 2016, 03:58:05 PM
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://www.newhavendisplay.com/nhd12864wgfttivz000-p-1993.html

COG:
https://www.newhavendisplay.com/nhdc12864wob1ttim-p-2953.html
Title: Re: Can one change the backlight color of a dot matrix LCD ?
Post by: Saurabh_B on May 09, 2016, 08:07:40 AM
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.
NHD-0216K1Z-NS(RGB)-FBW-rev1 (http://www.newhavendisplay.com/nhd0216k1znsrgbfbwrev1-p-2844.html)
Title: Re: Can one change the backlight color of a dot matrix LCD ?
Post by: alex5 on May 11, 2016, 07:42:52 PM
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.

Title: Re: Can one change the backlight color of a dot matrix LCD ?
Post by: Saurabh_B on May 12, 2016, 08:48:43 AM
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.
Title: Re: Can one change the backlight color of a dot matrix LCD ?
Post by: alex5 on May 12, 2016, 09:22:40 AM
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.