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lcd panel looks like it has a smudge supplier

- Oct 16, 2022 -

lcd panel looks like it has a smudge supplier

How much DSE you see depends partly on the model you purchased. Pricier models generally feature improved better uniformity, mostly because manufacturers use more rigorous quality standards for their high-end products. But, no matter how much you spend, uniformity is unique to every individual unit, meaning you don"t really know how much DSE you"re getting until you see it in person.

Is your obsessive side getting twitchy yet? Before we discuss upping your Xanax prescription, let"s review how the DSE demon begins its possession of your beloved screen.

If you own a plasma TV, the pixels are individually illuminated and all capable of achieving the same level of brightness. This tends to make DSE less visible in these devices, particularly in high-end models.

Still, DSE may afflict cheaper versions, particularly if the anti-reflective coating on the glass that overlays the screen is of low quality or poorly applied. Furthermore, as the display ages, the phosphors in the screen may begin to wear out or malfunction, all of which can contribute to less uniform images, which is often apparent particular in scenes with fast panning shots.

In LCD and LED TVs, DSE is typically a bigger issue, one that"s due to the way these units are illuminated. Before we proceed, it"s worth mentioning that although marketing-speak often treats LED and LCD TVs as completely different technologies, they"re not different beasts.

LED units could be more accurately described as "LED-backlit LCD televisions," but salespeople and consumers alike are too lazy to utter that tongue-wearying phrase while haggling in a big-box store. What"s important to realize is that both categories rely on LCDs (liquid crystal displays), which act as shutters that either block light or allow it to pass, depending on the image that"s being rendered on the screen.

There are a variety of factors that affect LCD quality, notably illumination source. Older LCD TVs, for example, used multiple cold cathode fluorescent lamps (CCFL) to light LCDs from the rear. They provide generally smooth and even illumination, but they make the final product rather bulky.

More modern TVs rely on LEDs (light-emitting diodes) as a light source. Some models have what"s called full-array backlighting, in which the LEDs are stationed in regular intervals behind the screen, creating even lighting and excellent picture quality.

Other models incorporate what"s called edge lighting, which positions the LEDs along the edges of the screen. In general, the overall picture quality isn"t quite as good as a backlit screen, but manufacturers still use it because it allows them to build substantially slimmer TVs.

Regardless of the lighting source, sometimes it"s not the technology itself that results in DSE. It might be due to the way the display was handled at the factory or even en route to your home.

If you"ve ever pressed a little too hard on your smartphone or computer screen, you"ve likely witnessed a bit of discoloration, clear evidence of how sensitive LCDs are to physical pressure. Now, picture a huge manufacturing facility that cranks out thousands of these units per week. It"s easy to see how a bit of mishandling could alter the screen"s consistency.

The same goes for shipping. Some units travel long distances in cargo boxes, and then take bouncy rides in your car to their final resting place on your living room wall. That"s a lot of opportunities for tiny mishaps to affect LCD uniformity.

lcd panel looks like it has a smudge supplier

My flat panel G4 iMac has been in storage for just over a year and I"ve just recently started using it again. Prior to it being taken out of use, there were no problems whatsoever. However, when I started it up for the first time recently, I noticed that there was an area of smudging, or some kind of stain, behind or inside the screen. (Otherwise everything was fine.)

First off, there is nothing on the screen itself that can be cleaned off. Whatever it is, is behind the screen. Secondly, I think it is very unlikely that this smudge or strain came about through some kind of pressure or impact to the screen, since, to the best of my knowledge, it was standing freely without anything or anyone (except to move it) near it.

Whilst it was in storage, the iMac was moved from where I left it to another part of the room it was in. It so happened that it was placed somewhat close to a non-double glazed window (the machine was coverered). I can imagine that over the course of over a year, after a damp and miserable Irish winter, near this window, there would have been temperature variations and probably a bit of dampness.

So, my theory is that a light layer of a mold like substance formed (I guess) between the LCD screen and the backlight. I believe this is the case, because there seems to no problems with the pixels in the "smudged" area: all colours are rendered just fine. It is just that the area in question is darkened, as if there were something obstructing or dimming the light coming from the backlight.

Is it possible to open the display, and somehow clean off this residue from whatever it is on (if my theory is correct)? It is slightly annoying, and if it can be sorted in any way easily I"d like to do it. I"m not afraid of opening up computers.

lcd panel looks like it has a smudge supplier

After a couple of months I bought the Cinema Display 27 second hand I started noticing the same streak / stain on the screen. I decided to open it up and tried different things like cleaning the LCD assembly, air blow the fan, or change the kapton tape in the back of the LCD asssembly but only to find out that none of this was the problem, as no dust or condensation were found (i cleaned it like 3 or 4 times with isopropyl and a microfiber cloth that came with my LG TV, and the process was a pain in the ass).

Then I noticed that this mark was very noticeable after a couple of hours of use when the display was hotter because it gets get hot, but it gets even hotter when it’s been used intensively, like watching a movie or playing a game, so I totally discarded the dust / humidity option apple has been giving.

Charge my computer with the Macbook charger, not the display, as it used to get hotter where the power supply its located. I remembered that during the first couple of months I didn’t have this problem (or at least I didn’t notice) because I was waiting for the magsafe to magsafe 2 adapter to arrive, so the problem basically started when I started charging my macbook with the integrated cable in the display.

Disconnected every USB peripherals in the back. I had it crowded, like the 3 usb ports were used, my iPhone, a little usb fan and numeric keypad. I know it might seem like its not too much, but every watt counts to avoid the display getting hotter.

Put a fan directed to the vents of the display in the right side. It is a mini fan, with AC, not USB powered. It keeps it cool by constantly blowing air inside the display.

At the moment the stain / streak is there, but is definitely less noticeable and the display rarely gets hotter again, just regular hot / warm. I know that this also might be a problem of the fan, I’m waiting for a replacement, but right now they’re not really easy to get where I live, so I guess I’ll have to wait and try that.

lcd panel looks like it has a smudge supplier

Have you ever left your TV or monitor on for days, stuck on the same image? You return to your screen, only to find an image burned into the display. No matter what you do, it won"t go away. It is a permanent image burn.

Why do monitors and TVs get image burn? Why can"t manufacturers prevent LCDs and plasma screens from a burnt image imprint? Moreover, what can you do to fix an image burn?

In some cases, you can minimize the image burn effect. In others, you can remove the image burn completely, so long as it hasn"t been burning too long.

Before flat-screens and crystal displays, most TVs and monitors featured CRT (Cathode Ray Tube) technology. In CRTs, individual pixels comprise a red, blue, and green phosphor component. Depending on the intensity of each phosphor component, the pixel appears to the human eye as a unique color.

When a particular still image remains for too long, the intensity of each phosphor component diminishes at an uneven rate. The result is a ghost image on the screen, which is known as image burning.

Plasma displays use plasma, a gaseous substance containing free-flowing ions. When the plasma is not in use, the particles in the plasma are uncharged and display nothing. With the introduction of an electric current, the ions become charged and begin colliding, releasing photons of light.

This is a very simplified version of how a plasma screen works. However, the main thing to understand is that plasma screens use phosphor material (like CRTs) to turn those photons into images.

LCD and LED do not work in the same way as CRTs, either. LCD and LED screens use backlit liquid crystals to display colors. Although manufacturers market screens using LED and LCD, an LED screen is still a type of LCD. The white backlight filters through the liquid crystals, which extract particular colors per pixel.

LCD and LED displays don"t suffer from the same type of image burn as CRTs and plasma screens. They"re not completely clear, though. LCD and LED screens suffer from image persistence. Read on to find out more about image persistence.

Before you can fix screen burn-in, take a second to understand why these images burn in the first place. LCDs and LEDs don"t suffer from burn-in as seriously as plasma screens. But static images can leave an imprint on both display types if left alone for too long. So, why does image burn happen?

First, let"s tackle plasma screen burn-in. Remember why CRTs experience image burn? When a still image remains on the screen for too long, the phosphor components in each pixel wear out at different rates. The uneven burn rates leave behind a ghost image, forever etched into the screen.

Plasma screens also suffer from phosphor deterioration. Plasma burning occu