How to maintain LCD screen

After the many problems caused by accumulation of dirt and (possibly) hard drives, LCD screens are the components that give more problems on notebooks.

You can buy replacement screens directly with the manufacturers, but the price is often prohibitive. In auction sites, you can find some screens used, usually taken from several notebooks with defects and sold separately. The fabrics used are a more palatable option in terms of cost, but it is difficult to find the exact model, and you never know what the real condition of the equipment before having it on hand.
Contest: COUNT THE LCD screens!
Photo Credit: Joseph Erlewein
Change a screen is a relatively simple procedure. You need to do only a partial disassembly of the notebook, removing one and installing the other. But changing the entire screen is almost always a waste, except, of course, situations where the notebook falls and LCD actually breaks.

First, the LCD itself is a kind of chip. The technique of manufacturing a processor and an LCD display are similar, the main difference is that the processor is made on the silicon wafer as an LCD screen is made of amorphous silicon, or a glass plate. In active tint screen, we have a transistor for each point on the screen (each pixel is composed of three points) and a small groove where the liquid crystal is deposited.

Liquid crystals are substances that have their molecular structure changed when they receive electrical current. In their normal state, these materials are transparent, but when receiving an electric charge become opaque, blocking the passage of light. The function of each transistor is to control the state of the corresponding point, applying the appropriate voltage for each tone:

The simplest LCDs, such as those used in watches and palmtops with monochrome screen, use a reflective layer, installed on the back, which simply reflects the ambient light. There are cases of colorful LCDs that use the same principle (as used in the Game Boy Advance), but LCDs used in notebooks always use back lighting.

Here we have an LCD screen notebook disassembled. See that she is only partially transparent. It is thanks to the lighting you can see the picture clearly:
There are two lighting technologies of LCD screens. The most common is the use of cold cathode lamps, a type of fluorescent lamp, compact and ultra low power consumption. A few ultra portable laptops like Sony Vaio TX2 use LEDs for illumination of the screen, a technology that allows producing thinner, economical and durable fabrics, however absurdly more expensive ;). Meanwhile, 99 % of LCDs use good old cold cathode lamps.

Like the flourishing domestic lamps, cold cathode lamps operate with a very high voltage (typically 1300 volts) required to transform the gases inside the lamp plasma that generates the light.

Fluorescent lamps in a reactor is used to generate the required voltage, is used as a notebook FL inverter , a type of ultra-compact reactor, which transforms the 5 volts supplied by motherboard in 1300 volts or more used for cold cathode lamps.

To save energy and also to cut costs, are generally used only two lamps at both ends of the screen. Between the two, we have a diffusing screen, which is in charge of spreading the light evenly across the screen.

The LCD screen itself is extremely durable, often needing to exchange only when it is cracked or broken. The cold cathode lamps have an estimated population of 10,000 hours (on older laptops) and lifetime 30,000 hours (at current notebooks) of continuous use. We also have the FL inverter, whose lifetime is almost always less than the lamp and the circuit board containing the controller screen.

Clean LCD screen using fabric

After much searching I found an efficient and quick way to clean LCD screens and LED without damaging the product. After much searching, because I need to clean my screen and my TV, I found a way to not use chemicals that can damage the screen. Check!

The problem was simple, even being careful is impossible to keep the screens 100 % clean. I do not know how or why these screens have the magical power to get dirty alone, but there are still not many tutorials with tips to help avoid this.

Then the light appeared to happily show me the correct way to clean the appliance. First let expensive and good that there are two types of dirt when it comes to cleaning the LCD screen is the first one common dust that accumulates over time, the other fingers and marks even though it should not touch the screen just touching.

To clean dust and very simple you just use a coffee filter to clean the screen! Yes friends a coffee filter helps you keep your TV or PC monitor dust free. That’s because it’s loaded eletronegativamente what makes the dust grains stick to the paper.

Now if you for some reason touched the screen and left that spot finger (which is actually the fat from your body that was on the screen) need to follow another line of cleaning may be using a clean cloth and thin enough not release NO plume. With this cloth you should clean the entire screen without any force on it so as to prevent it from scratch.

If the dirt is too large you can go to an electronics store and look for a specific product to clean LCD monitors. Although hard to find these products exist that can help you accomplish is very clean. The important and following the manufacturer’s instructions.

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