lcd module light bleed quotation

It is a very common phenomenon that liquid crystal display panel and the frame are not tight enough that some lights are transmittance out. It is inevitable to some extent and only a matter of how serious it is. Low-end display panels are more serious, meanwhile, high-end display panels are better.

We must know the principles of LCD. Electrical-optical conversion is that the outer light transmittance is changed because the alignment direction of liquid crystal molecules is changed by the electrical field. LCD which is different from the direct view CRT is displaying digital images and vivid colors by using electrical-optical conversion and different excitation of R, G, B three colors.

Liquid crystal is sandwiched between two layers of glass where the upper layer is CF glass and the lower layer is TFT glass. The surface of two layers of glass is uneven. In order to grip and arrange the liquid crystal, the interface of two glasses is coated with a layer of PI (polyimide), and then it is rubbed by a cloth. Therefore, this kind of backlight bleeding is inevitable. But more often than not, they are invisible. Some panels have serious backlight bleeding problem because of poor quality or transportation problems that will be detected by productive process and could be avoided. Thus, it is obvious that the backlight bleeding problem of some liquid crystal display panels is not caused by this reason.

Second, the extrusion is caused by assembling LCD. This is the most important reason of backlight breeding. It is relatively loosing requirement, dirty environment and rough process for assembling LCD, compared with producing display panel. There is a slight leak between the display panel and the frame when LCD is assembled. But it is very difficult to be seen by naked eyes, and we can clearly see the backlight bleeding only in an all-black environment.

There is a law in our country that luminous flux of backlight bleeding must be less than 4 cd/㎡ in an all-black environment. In this condition, backlight bleeding will not affect the using time, the response time, the brightness and other aspects of LCD.

We should not pay much attention since backlight bleeding does not affect the use of LCD, and manufacturers may not obey the return policy. It is completely normal that there is a slight backlight bleeding in the assembling LCD. High-end LCD barely has any serious backlight bleeding situation because of the high-quality display panel, carefully assembly process and excellent display design. For example: EIZO and NEC.

If you buy a low-end LCD, you have to check the LCD very carefully, otherwise, the return of the product will not be allowed by the vendor even there is slight backlight bleeding. But if you by a high-end LCD, you don’t have to worry about backlight bleeding, because you can enjoy excellent after-sale service for a high-quality product.

Many of our monitors and TVs suffer from an affliction. It is a scourge that deforms our beautiful displays and breaks the immersion into our lovingly rendered games. It has ruined many a pristine LCD. It might have already affected your friends, neighbors, and loved ones. It’s called backlight bleed, and it could happen to you.

What is screen bleeding? If you’ve ever seen a monitor or a TV with white light escaping from around the edges of the display, you’ve already witnessed it firsthand.

Your display has a panel consisting of pixels at the front, each of which changes color to create images. These pixels are illuminated by something called a “backlight,” which is behind the panel. Backlight bleed occurs when the seal between that panel and the frame of your display allows some white light to “bleed” through. This inconsistency has also been called “screen bleeding” or “flashlighting.”

There’s another form of backlight bleed called “clouding” where the backlight can be seen more brightly through the panel in certain areas, giving the screen a cloudy and uneven look. Clouding can occur when the panel has had pressure exerted on it for a prolonged period of time.

One thing to keep in mind is that you might be seeing something that looks very similar to backlight bleed if you have an IPS panel, but this is actually a phenomenon called “IPS glow.” There are multiple kinds of LCD screens and IPS (In-Plane Switching) panels that often get a sort of glow in the corners of the screen when they are displaying dark images. It’s important to note that the steps listed in this article to help reduce backlight bleed will not help with IPS glow.

We all know that we aren’t supposed to touch our screens, but that isn’t just to keep our smudgy finger oils off. It’s also to keep the seal between your panel and the display frame tight. By mishandling or even simply jostling our displays, we risk loosening the panel at the edges and allowing light to escape.

That said, it doesn’t always come down to user error. Backlight bleed can start long before you take your display out of the box. The damage could have occurred while the display was shipped, stored, or the manufacturer may have never installed it correctly to begin with.

If you just bought your display and it comes with any amount of backlight bleeding out of the box, you should return it immediately. Any respectable retailer will offer a free return for significant issues out of the box. In the event they do not accept the return, look up the manufacturer and try to file for an RMA (Return Merchandise Authorization.) Keep in mind that attempting to fix your TV or monitor yourself may void an active warranty. Returning it and getting a new one is a much safer alternative.

Well, if your warranty is expired, the display can’t be returned, and the bleeding has progressed to the point where it’s become too distracting to ignore, then there may still be a way for you to fix your display.

Take a screwdriver and slightly loosen each of the screws on the back of the display. Just a half turn should be plenty. It’s possible that the frame was too tight and was pinching the panel.

Unplug the display again if this did not solve the issue. Next, take a microfiber cloth and gently rub the areas on the screen where you’ve seen the bleeding. Do this in a circular pattern. Apply just enough pressure that you see a slight warp on the screen. What you are attempting to do is massage the panel back into place.

If you’ve completed steps 5-7 several times with no success and are looking to take more invasive measures than there is one last thing that you can do. You can pin the panel down, sealing in the backlight by dismantling the display and applying electrical tape around the edges of the LCD. This method is the most likely to damage your display and should only be done after all other avenues have been exhausted.

Now go forth, armed with the knowledge and procedures to treat those who’ve been hurt by the horrid white rays of backlight bleed. Tell your friends that the dark days of playing Counter-Strike through a poorly sealed screen are finally over.

Thanks for your help MiguelD. I did check for blown pixels with several YouTube RGB videos and they seem ok as far as I can tell. I was really looking forward to the 32" display size, but even ignoring the bleeding on dark images, you can"t use the left and right 2-3 inches of the screen without shifting my body to look at that area straight on and eliminate the bronzing / orange coloration. Defeats the purpose of the size.

It"s amazing how bad it looks as soon as you look at a darker or low key image.  After I started this thread, I made my wife sit in front of the BenQ screen and look at the corners.  She thought I was doing my usual complain about everything / perfectionist thing, but the bronzing in the corners and bleed was immediately obvious to her.  I really just want / need a new display that looks decent without obvious problems anyone would notice.

In this post I’ll talk about pressure stains and light leaks and if you’d like it will be a pleasure for me to tell about other defects in the next post!

Light leak/ bleed is backlight shining through where it is not supposed to. Most often it can be seen on edges of the screen and in some cases as smaller spots in various areas.

Backlight is at the back of the screen and it allows you to see the actual picture as otherwise you would have to use a flashlight to see anything:) if one of the layers is slightly misaligned from the edge it creates light leakage in that area.

looks like a small bright spot or some times similar to a normal light leak and are caused by some internal components like screws or sharp board edges in the monitor/tablet/phone pressing against some of the panel layers causing them to stretch and letting more light to go through. In some cases pressure applied at the factory by workers during assembly can cause a pressure stain.

Electronic/structural function is not achieved, such as display isabnormal, speaker output sound distorted, battery cannot be charged,the expansion interface /UI no function, buttons no function, LED indicator lights’ status is incorrect, imperfect paintwork etc.There is bias on electronic/structural function, such as the display brightness is not up to the standard, speaker volume is soft, structure gap exceeds the standard etc.

from 1,00,000 screens 50% have no visually identifiable light leak from a typical end user viewing distance. 25% have minor light leak that can be seen. 20% have average light leak that most people would find annoying. 5% have SEVERE light leak.

*Some of you might think that calculation above is unfair as it does not include RMA (consumer return) costs. While it’s true! In the end of the day not so many people go for service and often times light leak is a grey zone in warranty of the product. *

That is the key point, these Alienware laptops are not cheap. They are premium products so how does a company like Dell not have better quality control on laptops that sell for upwards of $4000? I love everything about the m17 R3 but I"m not going accept a laptop with this much backlight bleed. I"m now going to try my luck with another brand.

If you’re like most people, your iPhone is your life. That’s why you absolutely need it to be functional. Right now, yours is having a problem that is concerning you, though. You know what a cracked iPhone screen looks like. Your phone… is doing something else altogether. Something is definitely wrong, but you’re not sure what. It is quite possible that what you’re looking at is iPhone screen bleeding. What is this? What can be done to fix it? Don’t worry, we have all the answers you’re looking for!

There is a little confusion over the term iPhone screen bleeding, because it can actually be broken down into two typical types: backlight bleeding and pixel bleeding. Backlight bleeding is when a bit of light shines through around the edge of the screen. This type of screen bleeding is much more apparent when the device is viewing darker images, because the backlight is white and it’s more visible on a darker background. Pixel bleeding, on the other hand, often happens from dropping your phone. When this happens, you will see rows or columns of pixels displaying black, purple, or oddly colored patterns. Yikes! That can’t be good!

You’re looking at your iPhone screen bleeding, and you know this isn’t good. What does this mean for your phone? Do you need a new one? Pixel bleeding is an indicator that the LCD has sustained significant damage. Even if it’s not that badright now, it will be soon. Unfortunately, it’s a sure thing that it will get worse over time. Regardless of how bad the pixel bleed is, the entire LCD will need to be replaced. This means your next step is to find a Miami area cellphone repair technician. Don’t waste any time booking a repair appointment to have it fixed.

This isn’t a DIY task. Because a pixel bleed is often the result of impact, it’s quite possible that the glass is broken as well. The good news is that you don’t need a new phone. The not-so-good news is that there is no simple way to fix a bleeding screen without enlisting the help of a qualified phone screen technician.

Lucky for you, you live in Miami and can contact us here at RapidCellFix. We specialized in bringing phones back to life when everything seems lost. Our technicians will fix your device in a blink of an eye, whether it’s broken glass, bleeding pixels, or both. When you see how quickly and how completely we fix your broken iPhone, you’ll know why we are so popular!

The "purple bleed" as you stated, is physical damage to the OLED display panel. It will grow at an alarming rate and will spread across the entire display. Worst cares it can take only hours or days rendering the device unusable.You should backup/import any important data to a PC/laptop ...

I’ve been quoted $400 (Australian pesos) to replace the LCD panel by a local repair place. This about the same cost to replace the whole machine and, to be honest, I’m not 100% sure a new LCD panel is necessary.

Pressure damage is just like it sounds. Too much pressure was on the laptop"s display causing the LCD to crack. This could happen by holding the laptop too tightly when carrying it. If you put the laptop into a bag when transporting it, then anything else in the bag could put pressure on the display and cause the LCD panel to crack. Neither of these would leave any external marks or signs. You do have to be a bit more careful with the Retina models since their displays are extremely thin and a bit more fragile.

If there are multiple cracks in the glass or the LCD panel, then Apple considers it accidental damage even if there are no signs of impact or external damage.