Qled backlight bleed

If there's one thing we've come to expect from the TV market, it's that there will always be competing formats and technologies for the consumer to fret over.

QLED vs. OLED TV: What’s the difference, and why does it matter?

A decade ago, it was all about plasma vs LCD, with each technology presenting a number of benefits and disadvantages. Although the differences in today's TV technologies are perhaps more granular and specific, they're no less important. While most people are aware of OLED's status as a high-end TV technology it's been in the public eye much longer than Quantum Dot-powered rivalsthere's still an air of mystery surrounding QLEDparticularly in regards to how it works and why you might want to choose it over other television technologies.

We left with a better understanding of the technology and how its implementation has improved since the last year, and we also got to see how it directly compares to the competition.

While many AV enthusiasts consider OLED to be the gold standard in TV display technology thanks in large part to its propensity for deep blacks and impressive contrastits drawbacks are less widely discussed. QLED 's strengths include unrivalled color performance — specifically when it comes to color accuracy and color volume — which directly address some of OLED's weaknesses. And innew approaches to backlighting have also brought QLED closer than ever before to achieving a similar 'pure black' effect to that boasted by OLED.

Colors and whites appear brighter and more vibrant, while blacks appear deeper and with less backlight bleed. FALD employs hundreds of tiny backlights across the entire panel, allowing the television to precisely control the areas of the screen that receive light. These are called 'local dimming zones'. In contrast to OLED, which uses self-lighting pixels instead of backlights, FALD is able to achieve far brighter highlights, making the difference between black and white areas of the screen even more pronounced.

Last year, Samsung's QLED TVs still relied on older edge-lit backlight technology, which spreads light across the panel from the sides of the display in a less-accurate manner. Each television featured a scene from the film La La Land, in which Ryan Gosling's character plays piano to a darkened room — a ray of light piercing in from the corner of the screen to reveal the piano player and a small portion of his audience.

The edge-lit QLED models came out poorest, showing a very obvious ring of light around the entire center of the image, making it appear as if Gosling was playing the piano from within a hazy bubble.

Of course, the OLED television's perfect blacks were on full display, however we were struck by how close the model QLED came to achieving the same effect. No light leakage or banding was present at all, and instances of obvious light blooming were completely absent. A major selling point of Quantum Dot technology is its propensity for achieving astonishing color accuracy.

However, things change drastically with the inclusion of Quantum Dot particles. When light hits the tiny quantum dot semiconductor particles we're talking anywhere from a few to several nanometers in size featured in QLED televisions, they emit incredibly accurate red, green or blue colors on screen.

Color is determined by the size of the quantum dots. In terms of how this affects your television viewing, the answer is simple: it allows for much greater accuracy when it comes to rendering colors, which means images are much closer to how things look in real life.

The greens of the rainforest appeared more vibrant and natural, with a real warmth becoming evident in the oranges and brown hues within the image. That warmth was notably less prominent on the OLED display. It's one thing to look at an image and judge a TV's color by how aesthetically pleasing it appears to be, but the only way to really appraise its accuracy is to compare it to offscreen elements in the real world.

In an effort to put its color accuracy to the test, a Samsung rep placed a Pantone color card against the screen of the quantum dot-powered Q9F television to show how closely it matched the colors on the card spoiler alert: the colors on each looked exactly the same.

Next, the card was placed against the same image on an OLED display, revealing a completely different, darker shade entirely. Even taking into account things like brightness and color settings, the evidence was fairly irrefutable — QLED leaves OLED for dead in terms of color accuracy. Not necessarily — at least in the case of expensive display technology.

Because the laws of nature dictate that organic materials suffer decomposition and decay over time. Remember burn in on plasma TVs, where images would get 'stuck' on the screen if they were displayed for too long? OLEDs can suffer from the same kind of problem. QLED televisions side-step this problem entirely, as the materials used in quantum dot technology are completely inorganic, meaning they're not susceptible to burn in issues.Get a weekly roundup of the latest news in the display industry.

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DisplayNinja is reader-supported. When you buy through links on our site, we may earn an affiliate commission. Links beginning with geni. Learn more. Backlight bleed is characterized as light leaking around the edges or corners of an LCD display. This is due to the way these displays work; they use a light behind the panel that faces the display.

Backlight bleeding is simply some of the backlight leaking through. There are no ways to completely remove this, though it can be reduced in some scenarios. If you have too much backlight bleed, you may be able to RMA your display. In short, if you are experiencing too much backlight bleeding, you should try to RMA your display.

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qled backlight bleed

Did you like what you read? Maybe Later. Table of Contents Close. Get weekly updates on the fantastic world of displays! June 18, No Comments. As Fast As Possible. Play Video. Related Reads. Rob Shafer.

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He now works full-time managing DisplayNinja while coding his own projects on the side. View Comments.Backlighting in 4K TVs may not be one of those specs which many consumers pay a tremendous amount of attention to but its importance is crucial in affecting the overall display performance of any 4K TV. Backlighting is crucial for high quality picture performance and contrast. Then of course there are also other core technologies within the rubric of TV backlighting which you should also bear in mind.

These mainly consist of local dimming and OLED display. First, before we move onto our descriptions of all the different 4K TV backlighting technologies and arrays, we have to make sure to give you a fundamental understanding of what local dimming is and how it works. This is where local dimming comes in. Obviously, the technology performs in radically different levels in each of these backlighting configurations.

The 4K TVs which deliver the best local dimming performance are full-array backlit models with the technology. Basically, premium edge-lit 4K LCD TVs depend on high quality light blocking in their LCD panels much more than on local dimming for the quality of their black level performance.

This creates a display and dimming performance for onscreen content which completely blows even the best LCD 4K TVs and their backlights out of the water in its precision. These two mechanisms for illuminating a 4K TV screen selectively are enormously different even though they both work to achieve the same purpose, which is to shine or cut off light passing through pixels on a television screen display surface for the sake of brightening or darken specific areas of the display as needed for the color and lighting patterns of content playing on its surface.

We mention color as well here because the RGB Red, Green, Blue subpixels of each 4K TV pixel which are activated in different ways to make all the millions of colors your TV displays depend fundamentally on a source of light for their color saturation patterns.

The vast majority of 4K TVs sold today are edge-lit models and generally speaking, this type of backlighting design is the cheapest and easiest to produce in a 4K LCD TV. Basically in an edge-lit television model, the LEDs used to illuminate content across a screen are found along the edges of the TV behind its LCD panel.

Better 4K TVs with edge-lit displays will on the other hand have all four of their edges covered in LED array strips all-sides configuration.

Generally, the major 4K TV makers are pretty leery of letting the public know which of their edge-lit 4K TVs come with all-sides LED arrays along all four edges and which models only offer LEDs along one or two edges but as a general rule, the all-sides configuration is the best by far at producing local dimming and better black uniformity in a TV display. On the other hand, many edge-lit 4K TVs can still be high-end premium models. Their black levels and black uniformity can also be excellent thanks to much better LCD panel design.

QLED TV explained: what it is, how it works, and the best QLED TVs you can buy

Also, if a 4K TV has both direct-lit backlighting and local dimming, the precision of the local dimming can be much better than it is in edge-lit 4K television models. So to distinguish the two, we need to make clear that in cheaper 4K TVs, the direct-lit backlight panels used are a lot different from full-array direct-lit premium backlight panels in that they contain far fewer individual LEDs and in many cases, they also lack local dimming of any kind.

In other words, without local dimming technology, the array of LEDs always stays fully active and only the LCD panel in front of it blocks out light selectively as needed for rendering dimming patterns in content. This is a design often found in cheaper 4K TVs and it can also often mean that a TV display offers even worse contrast than an edge-lit model.

Even in direct-lit 4K TV models with local dimming, the quantity of LEDs arrayed directly behind the LCD panel is really limited and offers only a few really big local dimming zones. This means weak local dimming precision for content and plenty of halo effect on bright points over a dark background. For the reasons above, cheaper direct-lit backlight designs with few LEDs are actually less common than edge-lit backlighting in many premium edge-lit 4K TVs. Even more importantly, all of these thousands or hundreds of LEDs are divided into numerous local dimming zones in which small groups of individuals diodes can be turned on or off as needed for onscreen content.

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Each of these dimming zones is made up of a group of LEDs which can be turned on or off together as needed for content on the screen and the technology as a whole offers a dramatic improvement over edge-lit local dimming or even basic direct-lit local dimming when it comes to picture quality and picture depth.

Hi there Manish. It almost certainly has an direct-lit backlight array but with limited numbers of LEDs and no local dimming for a model like this. Great article featuring a lot of useful information! Nice briefing and superb clarity given in the article. Great work and good explanation. Great piece…very accessible! Or is it really only of value when every other piece in the chain cables, source media, etc support these technologies???

Hi there Jerry. Hey there Owoios. Thanks for pointing that out.The Future is calling! Deel je ervaringen rondom de S20 en praat mee! Ik heb sinds vorige zaterdag een 43Q60R-televisie. Ik ben erg opgetogen over de mogelijkheden en de beeldkwaliteit maar de tv vertoont wel wat backlight bleed Het is niet altijd even irritant maar eens je het weet, begin je er natuurlijk op te letten Nu heb ik contact opgenomen met Samsung via Messenger en die adviseerden me om contact op te nemen met de winkel en hem om te ruilen, maar bij de winkel zeggen ze dat de tv eerst moet worden binnengebracht bij Samsung, waardoor ik hem al meteen kwijt ben Valt er iets te doen aan die backlight of wat doe ik hier het beste mee?

Ga naar oplossing. Het probleem is niet helemaal verdwenen maar gelukkig is het niet zo irritant dat er niet mee te leven valt nou ja, er zijn ergere dingen in het leven. Bekijk de oplossing in de community in het oorspronkelijke bericht. Zie de sticker op de achterzijde van de tv. Is de huidige softwareversie van de tv de Kun je misschien alvast de tv een keer resetten?

Dit om alles uit te sluiten alvorens de tv retour te zenden. Ik heb foto's genomen maar door de lichtomstandigheden hier in huis zijn die op dit moment wellicht niet ideaal; ik kan vanavond wellicht betere foto's nemen, indien nodig - ik hoor het graag. Op zich snap ik wel dater bij dergelijke tv's wat backlight bleeding kan zijn maar het staat wat in contrast met de rest van de beeldkwaliteit.

Het paneel zelf lijkt me inderdaad niet defect - ik ga ervan uit dat het inderdaad backlight bleeding is, maar daar valt niet al te veel aan te doen, neem ik aan. De vraag is maar of het voldoende is om onder garantie te vallen en dus voor omruiling in aanmerking te komen de tv is net een week oud maar ik heb geen zin om hem meteen een tijd kwijt te zijn Geen dank natuurlijk!

Je kan echter altijd nog gebruikmaken van de wettelijke termijn van veertien dagen die voor internetverkoop van nieuwe producten geldt Bedenktijd.

Zonder opgaaf van reden retour afzender. Wel ff aankondigen!

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Ik heb de tv in een fysieke winkel gekocht en niet op het internet Ik heb de winkel al eens gecontacteerd maar zal zelf eens langsgaan met de foto's, dan zie ik wel of een omruiling mogelijk is. Vandaag is de monteur van Servilux langs geweest. Hij zag het probleem niet meteen Nu kreeg ik de kamer ook niet meteen helemaal verduisterd maar de backlight bleed was toch bovenaan te zien. Dan lag het weer aan de uitzending zelf decoder, YouTube, Netflix, De monteur zei dat een nieuw paneel geen zin had nou zeg, een tv van drie weken oud ga ik heus niet laten repareren - dan deugt het product niet.Nano Cell technology offers a more vibrant colour palette to support more than a billion colour combinations, thereby taking the TV viewing experience to an entirely different level altogether.

This technology uses nano extremely tiny particles for absorbing unwanted light wavelengths, thereby enhancing the purity of the green, blue, and red colours displayed on the TV screen. Therefore, there is no need for a fight for having the best seat. Every seat can give you the same experience.

The result is a two-fold improvement in the viewing experience. NanoCell technology comprises of using a light-absorbing material that blocks the wavelengths between green and red colour filters. Generally, the colours in this wavelength of and nm pass through in the standard TV technology.

qled backlight bleed

As a consequence, this contributes to the desaturation of red and green colours. It is also called bleeding of the red light in green and vice-versa. By blocking this light, the NanoCell technology ensures the production of pure red and green colour on the TV screen.

The NanoCell technology uses particles of the size of one nanometre in size to absorb unnecessary light waves and deliver pure colours of the highest quality. The advantage of this technology is that it filters out colours precisely to give an output of the best quality.

This technology delivers pure reds that are unadulterated by orange and yellow colours. Therefore, you do not experience any fading colours that cause instability. The name is new, but the technology still depends on a backlit LED panel. Technically, it is an improved form of LCD technology. QLED comprises of tiny dots that display each pixel. It allows them to display 4K display standards on conventional LCD technology.

Therefore, it is not the ideal technology to have if you aim to conserve the environment. Therefore, this technology can create perfect blacks. The additional advantage is that this technology can fit into the thinnest of TV screens.

It can also fit into the curved screens.

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Therefore, it improves the viewing angle considerably. Secondly, this technology is organic technology, whereby it is environmentally friendly.

This technology is capable of delivering the ultimate in picture quality. By filtering out the unnecessary shades, the resultant image is of the highest quality. Final Words TV technology is improving almost daily. Each manufacturer is trying to outdo the other.

SAMSUNG Ks-8000 & What can we do about Top to bottom Bleeding Lights???

One thing is sure from this intense competition, and that is the customer has a fantastic time out there. The customer has a wide range of options to choose from. The customer never had it better in the past.QLED is a word you'll see used a lot when you're researching the best TVsbut it means nothing on its own. The backlight shines towards your eyes, and the LCD filter determines which colours are displayed for a given pixel, and deals with cutting out light when needed for dark areas — and not always particularly well.

The light of the backlight is converted to pure colours by a film of 'quantum dots' before it reaches the LCD colour filter, helping the colours stay more accurate and bold. In this case they're tiny flourescent particles, synthesised in a lab, which measure between 2 and 10 nanometers in diameter. While quantum dots have a number of bafflingly complex practical scientific applications, we're concerned here with light.

When a quantum dot absorbs light, its chemistry essentially converts to light of a particular and very specific wavelength. The size of the particle determines the colour it outputs: larger dots release energy at a slower rate, giving them a wavelength close to red, while smaller dots trend towards blue. For manufacturers, going with a quantum dot display doesn't mean completely reinventing the wheel. It's very close in structure to standard LCD TV tech, which helps keeps costs down, while providing an gigantic burst in the richness and quality of the picture.

A quantum dot also isn't a thing that's set in stone. Samsung, the major backer, manufacturer, and patent holder of the tech in TVs, has changed and refined the metallic formula of its quantum dots over time to improve their output — QLED is an evolving technology.

Each pixel can dim itself right down to being off for when dark or black content needs to be shown, and this can be right next to a pixel blaring at full brightness, meaning dazzling contrast between the two.

qled backlight bleed

However, these individual pixels can't go that bright compared to a large backlight. QLED gets its light from a bright cluster of white or blue LEDs, shone through a complex diffuser to ensure complete coverage of the screen — more light mean more brightness.

However, having this broad light means it's hard to have very dark and very light areas next to each other, because they have the same light behind them.

High-end QLED TVs therefore have backlights that can be dimmed in zones — up to of them in the best TVs — so that dark areas can be dark and light areas nearby can have all the brightness they need. We've mentioned the price: QLED's similarity to existing tech means that companies have been able to scale it up very quickly, both in terms of size and resolution. You'll find really large screens in the QLED domain, and there's a lot more room for experimentation. QLED also trends towards the cheaper end of the market, with brands like TCL and Hisense banding together with Samsung to create low-cost screens, and the larger panels tending to compete strongly with OLED in the wallet department by at least a small margin.

Then there's the picture. QLED is frankly a stunning experience if you're not used to high-end displays, with incredible colour reproduction, vast contrast, and high amounts of saturation, the perfect medium for HDR content. Zoned illumination helps to darken areas that need to be darker, and there's a lot less of the greyness that non-QLED screens display, but QLEDs do suffer from light bleed, where a slight haze surrounds bright objects in an otherwise dark scene, and there's not as much nuance visible in dark scenes as OLED.

While viewing angles have been steadily improving over time, QLED screens do tend to look best when viewed head-on — this does depend on the LCD type used, but it's pretty much a universal constant that the further you go from central, the worse the picture will look, though a lot of work is done in high-end screens to mitigate this. It's also a little slower than OLED. There's still a liquid crystal panel in there, and that requires a little extra time to turn on and off, unlike the instantly addressable pixels of an OLED panel.

This tends to be more of a theoretical problem, though — you don't see any real effect of this on the best TVs. You don't have a huge choice of manufacturers. It's the company with the know-how, and it absolutely has the best QLED screens. Here's a selection of four top choices currently, for a range of budgets — we expect to review more QLED TVs of all prices inthough, and we'll update when new models arrive.

Samsung's flagship isn't so much remarkable for its QLED panel though that's really, really, really good as it is for the way it uses it; the AI upscaling used to dial up image resolution is absolutely peerless, whether you're devouring 4K content or even plain ol' Full HD.

QLED TV explained: what it is, how it works, and the best QLED TVs you can buy

Being a flagship, the price is a massive kick in the teeth, but it's the ultimate QLED experience, and proof that Samsung absolutely has this picture processing thing nailed. Samsung's killer TV from absolutely blew us away, earning itself a T3 Award, and there's no reason not to seek one out today.

Yes, spec-wise, it's a little lower than the TS, with last-gen Quantum image processing and 4K resolution rather than 8K, but what it does with those tools is produce an impeccable picture with superb black levels and strong HDR highlights.

Flick it into game mode and you get a very fast response we measured the inch model at an excellent And here's the best part: Samsung's about to release a sequel, the Q90T, so prices on this model have already dropped massively, and might drop a little further.

But there's a secret, which is that this TV actually has fancier backlighting tech than the model that's replacing it, so for the next few months, this is the TV to beat for bang-for-buck. And it's just as good at upscaling and handling motion, while having the same gaming-friendly fast refreshing.

Its upscaling is great, its picture quality is inky, bright and stable all in one, and it has a great software package inside making it the perfect smart TV if you don't want a huge amount of clutter in your living room. Alex Cox. How many billions did the billionaires add this year?However, anyone looking to purchase a new TV should know that these products are like day and night. How do quantum dots work? Check out our deep-dive into the technology for all of the details.

The LCD panel — essentially millions of tiny shutters that open and close too quickly to see — in conjunction with color filters, create the picture you see by letting just the right amount of light and color escape and reach your eyes. Instead, it refers to the fact that every single pixel in an OLED TV is also a teeny, tiny LED light — but one that is incredibly thin and can produce both light and color in a single element.

There are several advantages to this design, but most would agree that when it comes to OLED TVs, the biggest advantage is the superb black level that can be achieved. When the pixel is off, it emits no light and no color, making it as dark as when the TV itself is turned off. It sells those panels to its sister company, LG Electronics, which uses them to build some of the very best TVs you can buy.

The result? Contrast is the difference between the darkest part of an image and the brightest part. But is it noticeable?

Because they use separate backlights instead of relying on each pixel to create its own light these LED backlights can be made incredibly, achingly bright.

OLED once blew all the competition out of the water in this section, but the use of quantum dots in QLED TVs have allowed it to inch forward in terms of color accuracy, color brightness, and color volume — according to Samsung, which claims that a wider range of better-saturated colors at extreme brightness levels are an advantage.

Response time refers to the time it takes for a pixel to switch from one state to another. The faster the response time, the crisper the image, especially during fast-action scenes. Though there is likely a speed of response time beyond which the human eye is incapable of telling a difference, we know from standardized measurements that OLED TVs are way faster — orders of magnitude faster than QLED TVs.

Input lag, on the other hand, refers to the delay between taking an action say pressing a button on a game controller and seeing the result of that action on-screen. Moreover, the amount of input lag you experience has little to do with one display technology over another, but more to do with how much image processing is happening on your TV behind the scenes. Refresh rate is another category that will inherently matter more to gamers than casual viewers. Under normal circumstances, a TV will use a refresh rate of 60Hz or sometimes doubles that — Hz.

With QLED screens, the best viewing angle is dead center, and the picture quality diminishes in both color and contrast the further you move side to side, or up and down. OLED screens, for comparison, can be viewed with no luminance degradation at drastic viewing angles — up to 84 degrees. OLEDs have come a long way. When the tech was still nascent, OLED screens maxed out at 55 inches. OLED, on the other hand, is, but you would have to be extremely unlucky for it to happen to your TV, even if you left a static image on it all day and night — repeatedly.

That occurred when the phosphors coating the back of the screen glowed for extended periods, causing them to wear out.


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