As we saw in the article on illumination with polarized light , place a filter polarizer on the lights, and one in the camera, we can be very useful to eliminate reflections on metal surfaces and better control the light.

But the lights do not need a filter polarizer and the optical quality of the camera, being able to use plastic sheeting that can be purchased with generous dimensions (eg 430 x 43 mm by 51 pounds ). However, if you use small compact flashes can be a bit exaggerated to buy that amount. Fortunately, there is another way to get these polarizers at zero cost, as any LCD has two polarizers, placed one on each side of the glass.

We have LCD screens on watches, on the phones, monitors, and even televisions, and surely you ever crashed one of these devices and you have thrown directly into the trash.

An LCD that has suffered a stroke, or monitor, as in our case, has lost the backlight can be turned into two large donors polarizing plastic sheets the size of the screen, we can use on a flash to produce polarized light.

Although essentially the same, each monitor will be dismantled in a slightly different, so you have to adapt the following to your case.

First dismantle the stand, and remove all the screws with the case. Sometimes the stickers hide any screws. Help yourself with a flathead screwdriver to pry open finish around the rim. Then disconnect the wires from the keypad and speakers, and remove the front of the case.

The metal strips conceal the four connectors on the lighting that crashed and the LCD panel. Disconnect everything and remove all screws you see in order to remove the metal housing that contains all the circuits.

What remains is a set containing the LCD panel and rear lighting system attached by a metal frame.

Continue releasing the remaining wires, and removing the screws holding the panel. Finally release the lever beam under the metal tabs on the edge. You can now remove the LCD panel backlight of your system.

The frame mount again in the backlight system and save it as you can also sacársele any use we see in another article.

With the panel resting on the table starts to take off the corner of one of the polarizing sheets with a spatula. When you release a piece, continuous pulling by hand, slowly, to take off all the polarizer. Then repeat on the other side of the LCD panel with the second sheet polarizer.

It is recommended that you wear a glove on the hand with which subject the glass, and that you try to be completely glued to the table, stand, or bend. Failure to do so is easy to split and you could cut yourself.

The two polarizers are covered with the adhesive that held the glass, so that will be cleaned using a solvent. The turpentine works relatively well and although I have not tried, you may do better universal solvent (in the comments there is a proven system to clean the polarizing filter ).

At the end you have two completely clean sheets which you can cut the pieces that fit best to fit your flash. When the courts let them round or square shaped to rotate to any position and identify the position.

As mentioned before, this same can be done with any LCD screen. For example an old Pocket PC with the split screen, we can draw two polarizers small enough to use with a compact flash, although we can not turn it to look for different angles of polarization, they are very narrow.

In closing I leave you with a video you can see the entire removal of the monitor step by step.

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2 Responses to "Get two huge polarizers of an old monitor"

1. OscarG says:

   15/09/2011 - 18:29

   A reader has experimented with various solvents and sends me an email with an effective procedure to remove the glue. I copy your message:

   probe with many solvents and some ate the whole filter, others were not doing anything in the end I found a perfect solution:

   1. - Dampen acetone filter completely, left to act for 2 to 5 seconds
   2. - Without removing the acetone completely dipped in turpentine and leave on for 5 to 8 seconds
   3. - Immersed in 2 liters of water, it is important that not too much water, then too will dilute the active
   4. - Stop sumegido 2 to 3 hours in the water. Once removed the Algua the glue will become a sheet of plastic adhered to the filter
   5. - Remove the adhesive film starting at a corner or region that is partially disengaged

   cost me like 20 pieces of evidence to reach this procedure but works great

   Thanks Marco

   Answer
2. luis says:

   02/12/2011 - 22:41

   I've never removed glue a sheet of these, but of other things and I always spraying the surface with
   three in one oil, leaving it a while (if you pass your finger over the surface is crawling the glue) and then wash with detergent of tableware.

   Answer