Does anyone know if this is possible?
Are backlit and non-backlit displays built the same way?
That is to say:
polarizing filter - glass - conducting layer - liquid crystals - conducting layer - glass - polarizing filter at 90? - reflector
polarizing filter - glass - conducting layer - liquid crystals - conducting layer - glass - polarizing filter at 90? - lightsource
In other words, can you remove the reflector and put a lightsource behind it?
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adding backlighting to non-backlit LCD ?
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What you have listed here is close. It depends on what type of reflector is at the back. Most backlit LCDs are transmissive,meaning they look exactly as you described, with the lighting element directly behind the polarizer. You can also get transflective, where there is actually a reflector inbetween these two layers, but the reflector allows light to shine through from behind. This makes it easier to see when the backlight is off (since you still have a partial reflector).
I'm sure you could probably assume that your module is just a reflective, which has a plain old reflector behind the polarizer. In this case, it has to be removed and the backlight (probably only EL will fit) is placed behind it.
A quick search on Google for "adding a backlight to LCD" came up with this well-done guide: A Simple Guide for adding an EL backlight to an LCD Intro. It has step-by-step instructions, pictures for every step, and plenty of warnings and "if you see this, you did something wrong" notes. It's certainly not for the faint of heart, but it is doable.
I'm sure you could probably assume that your module is just a reflective, which has a plain old reflector behind the polarizer. In this case, it has to be removed and the backlight (probably only EL will fit) is placed behind it.
A quick search on Google for "adding a backlight to LCD" came up with this well-done guide: A Simple Guide for adding an EL backlight to an LCD Intro. It has step-by-step instructions, pictures for every step, and plenty of warnings and "if you see this, you did something wrong" notes. It's certainly not for the faint of heart, but it is doable.