anyone know the voltage of LED backlight laptop screens?, I have a project in mind Options

[match220]

I just replaced a friends laptop LCD screen and it has an LED backlight instead of the neon tube type backlight. I decided to disassemble the screen to pull out the LEDs to see what size they are and if I could probably use them in something else. They are the flat bright kind, and I'm thinking about rearranging them into a square pattern and putting them behind my dome light. I can't seem to find the voltage online, and I don't want to risk blowing them by guessing. I thought about wiring them into a radioshack universal power adapter that I cut the tip of a long time ago, that way I can slowly increase the voltage until they come on. But I still won't know the exact voltage they were made for.

Does anyone know what voltage they are supposed to be? Or at least approximately.

[Unicorn]

I just replaced a friends laptop LCD screen and it has an LED backlight instead of the neon tube type backlight. I decided to disassemble the screen to pull out the LEDs to see what size they are and if I could probably use them in something else. They are the flat bright kind, and I'm thinking about rearranging them into a square pattern and putting them behind my dome light. I can't seem to find the voltage online, and I don't want to risk blowing them by guessing. I thought about wiring them into a radioshack universal power adapter that I cut the tip of a long time ago, that way I can slowly increase the voltage until they come on. But I still won't know the exact voltage they were made for.

Does anyone know what voltage they are supposed to be? Or at least approximately.

Without sounding like too much of a nerd ( ) there's very little that I can't tell you about an LED or it's driver circuitry, but I'd need to see a pic of one of them first of all, so that I can determine the exact type of emitter that you're dealing with. If you want me to be general about it, you should be able to direct drive a SMT LED up to roughly 3.5-4v without doing damage, but a safe voltage would be 3v. If you are dealing with high intensity or high output LEDs, it's different - but since these came from a laptop LCD backlight I assume they are just standard SMDs, but I'd still like to see a pic of them so that I can tell you exactly what you're working with

Source(s); I'm an Electronic Engineer, but more importantly I design, build and collect/use high performance flashlights, most of which are LED based.

[match220]

Here's a picture, I can try to take a better one for you, but this is the best one that I could get. I'm cheap and my digital camera is about 5 years old, so it's autofocus and flash are starting to act up. I'm not sure if it matters, but one LED strip came from a gateway nv50a that I just worked on, which is the circuitboard type backlight. The other came from a toshiba satellite I think, which has the tan-ish brown flexible band instead of the circuitboard backlight.

picture of LED strips

I just replaced a friends laptop LCD screen and it has an LED backlight instead of the neon tube type backlight. I decided to disassemble the screen to pull out the LEDs to see what size they are and if I could probably use them in something else. They are the flat bright kind, and I'm thinking about rearranging them into a square pattern and putting them behind my dome light. I can't seem to find the voltage online, and I don't want to risk blowing them by guessing. I thought about wiring them into a radioshack universal power adapter that I cut the tip of a long time ago, that way I can slowly increase the voltage until they come on. But I still won't know the exact voltage they were made for.

Does anyone know what voltage they are supposed to be? Or at least approximately.

Without sounding like too much of a nerd ( ) there's very little that I can't tell you about an LED or it's driver circuitry, but I'd need to see a pic of one of them first of all, so that I can determine the exact type of emitter that you're dealing with. If you want me to be general about it, you should be able to direct drive a SMT LED up to roughly 3.5-4v without doing damage, but a safe voltage would be 3v. If you are dealing with high intensity or high output LEDs, it's different - but since these came from a laptop LCD backlight I assume they are just standard SMDs, but I'd still like to see a pic of them so that I can tell you exactly what you're working with

Source(s); I'm an Electronic Engineer, but more importantly I design, build and collect/use high performance flashlights, most of which are LED based.