What is a Quantum Dot TV (aka QLED)?
Despite some shortcomings, LCD TVs are the dominant type of TV sold as well as purchased past times consumers. The credence of LCD TV has accelerated the disappearance of CRT as well as rear-projection TVs as well as is too the head argue why plasma TVs are no longer amongst us.
In recent years, OLED TV, led past times LG, has been publicized past times many for its "improved" surgery every bit a successor to LCD. However, although it represents a footstep frontwards inward TV technology, LCD TVs tin dismiss yet pick out a footstep frontwards amongst the incorporation of Quantum Dots (aka QLED).
Quantum Dots as well as QLED refer to the same technology. QLED is a marketing term that Samsung as well as TCL utilization inward the build of their Quantum Dot TVs, which combine LED backlighting amongst Quantum Dots for color enhancement.
What is a quantum dot?
For the purpose of application inward TV as well as video displays, a Quantum Dot is an artificial nanocrystal amongst semiconductor properties that tin dismiss last used to improve the brightness as well as color surgery displayed inward yet images as well as video on an LCD screen.
The Quantum Dots are emissive particles (a flake similar phosphors on a plasma TV), but, inward this case, when they are hitting amongst photons past times an external low-cal source (in the illustration of the LCD TV application a blueish LED light), each indicate emits color of a specific bandwidth, determined past times its size. The larger points emit a low-cal tilted towards the blood-red and, every bit the points move past times away smaller, they emit low-cal to a greater extent than inclined towards the green.
When the quantum dots of designated size are grouped together inward a construction (we volition speak over this afterward inward the adjacent section) as well as combined amongst a blueish LED low-cal source, they tin dismiss emit low-cal through the entire color bandwidth required for TV viewing...
Taking payoff of the properties of Quantum Dot, TV manufacturers tin dismiss improve the brightness as well as color surgery of LCD TVs compared to electrical flow capabilities.
How quantum dots tin dismiss last used inward LCD televisions
Once the Quantum Dots stimulate got been created, the points of unlike sizes tin dismiss last positioned randomly or inward an organized means inward a casing that tin dismiss last placed within an LCD TV (with an LCD TV the points are to a greater extent than oftentimes than non of 2 dimensions, ane optimized for Green the other optimized for red).
- Positioned within a casing (called Edge Optic) along the edges of the LCD panel betwixt a blueish LED low-cal source as well as the LCD panel (for LED / LCD TV amongst an illuminated edge).
- On a "film improvement layer" positioned betwixt a blueish LED low-cal source as well as the LCD panel (for Full Array TV or straight low-cal LED / LCD).
- On a chip positioned inward a higher house blueish LED low-cal sources along the border of an LCD panel (for LED / LCD TVs illuminated past times the edge).
However, a blueish LED sends low-cal through the Quantum Dots, which are as well as then excited to emit blood-red as well as greenish low-cal (which is too combined amongst blueish from the LED low-cal source).
The unlike colored low-cal as well as then passes through the LCD chips, the colored filters as well as on the shroud to display the images. The added Quantum Dot emission degree allows the LCD TV to display a to a greater extent than saturated as well as wider hit of colors than LCD TVs without the added Quantum Dot level.
The number of adding quantum dots to LCD televisions
TVs as well as video technologies cannot display the full-color spectrum. With this inward mind, the triangles nowadays within that spectrum present how much the diverse color technologies used inward video display devices approach this goal.
As you lot tin dismiss consider from the reference triangles, LCD TVs that utilization traditional white LED backlighting or border lighting present far less than the NTSC color criterion adopted inward 1953 for color transmission.
However, every bit you lot too see, when quantum dots are added to the mix, the color on an LCD TV has the mightiness to extend far plenty to run into the criterion NTSC color requirements.
The practical effect: the colors are to a greater extent than saturated as well as natural. Quantum Dots tin dismiss too last used to run into the requirements of both hard disk (rec.709) as well as Ultra hard disk (rec.2020 / BT.2020) color standards.
LCD vs OLED
As mentioned inward the introduction to this article, LCD TVs are the nigh mutual type used past times families to a greater extent than or less the world.
However, LCD TVs stimulate got disadvantages inward color saturation as well as dark degree performance, specially when compared to plasma TVs. The incorporation of dark as well as white LED lighting systems helped inward some way, precisely it was non enough.
In reply to these shortcomings, the telly manufacture (mainly LG) has pursued OLED every bit a solution, since televisions that contain OLED engineering tin dismiss make both a wider color hit as well as an absolute black.
Although the OLED is accepted every bit a improve option to LED / LCD, after years of promises as well as failed attempts to attain the market, inward 2014 exclusively LG as well as Samsung entered the telly marketplace amongst large-screen OLED TVs that were introduced at CES 2013 using 2 unlike approaches.
LG uses a organisation called WRGB, which is a combination of white-light OLED subpixels as well as color filters to make images, land Samsung has incorporated red, greenish as well as blueish light-emitting OLED subpixels.
Samsung abandoned the production of consumer OLED TVs inward 2015, leaving LG and, as well as Sony, the exclusively OLED TV sources destined for the US consumer market.
OLED TVs await genuinely cool, precisely there's a large employment that keeps the residuum of the TV manufacture from bringing OLED TVs to the marketplace on a large scale, the costs.
Despite the claim that LCD TVs are to a greater extent than complicated inward the construction than OLED TVs, the existent fact is that OLEDs are to a greater extent than expensive to make inward the large shroud sizes required for televisions.
This is due to defects that direct house inward the production procedure as well as that drive a large pct of OLED screens rejected past times the utilization of large screens. As a result, nigh of the alleged advantages of OLEDs (such every bit the mightiness to display a wider color gamut as well as a deeper dark level) than LED / LCD TVs are suffocated.
Taking payoff of OLED production problems as well as the mightiness to contain Quantum Dots into the currently performed LED / LCD TV pattern (and really few modifications required inward the assembly line), Quantum Dots could last the ticket to convey the surgery of the LED / LCD TV closer to that of what TV producers were hoping for amongst OLED - as well as at much lower costs.
LCD amongst Quantum Dots vs. OLED
Without going into many technical details, when comparing all iv sets, it turns out that the color coverage of the 2 Sony Quantum Dot LED / LCD sets used for comparing as well as the master copy Samsung OLED gear upward are really close, land LG OLED gear upward genuinely it seems to piece of work badly.
On the other hand, land the Samsung gear upward is capable of producing high brightness, both Sony Quantum Dot LED / LCD as well as LG OLED sets are really close.
However, the nigh pregnant departure is inward liberate energy consumption. OLED TVs eat to a greater extent than mightiness than both Sony sets used inward this comparison, specially considering that the Sony 65-inch 4K gear upward consumes less liberate energy than both 55-inch OLED TVs. This would mean, except for whatever engineering scientific discipline progress of time to come generations of OLED TVs, that a 65-inch OLED TV could eat to a greater extent than mightiness than its equivalent quantum dot-enabled LED / LCD TV.
While LED / LCD TVs eat liberate energy at a to a greater extent than stable degree regardless of the brightness output (although other TV functions, such every bit Smart TVs, etc., when engaged tin dismiss behave upon liberate energy consumption), the liberate energy consumption of the TV OLED changes amongst the brightness degree required to make images. So the brighter the content, the to a greater extent than liberate energy is consumed and, of course, the interest of Smart TV as well as other features volition too alter this.
Thus, the additional toll constituent inward both the production as well as purchase of an OLED TV may non offering a groovy improvement over a LED / LCD TV amongst Quantum Dot.
Quantum Dots: a colorful nowadays as well as future
The head suppliers of Quantum Dot engineering for utilization on TV are Nanosys as well as 3M, which render the Quantum Dot cinema selection (QDEF) for utilization amongst total matrix backlit LED / LCD TVs.
The utilization of Quantum Dots has made a groovy boundary frontwards every bit several TV producers stimulate got set on display Quantum Dot-enabled televisions at fairs such every bit Samsung, TCL, Hisense / Sharp, Vizio, as well as Philips. Of these, Samsung as well as Vizio stimulate got launched models on the marketplace inward the United States: Samsung makes their Quantum Dot TVs every bit QLED TVs, land Vizio uses the term Quantum.
Strangely, LG, which showed some prototypes of Quantum Dot TV inward 2015, manifestly decided to retire as well as set to a greater extent than resources into its Nano Cell engineering on selected LCD TVs as well as to build to a greater extent than expensive TVs using OLED technology.
Since LG as well as Sony (since 2019) are the exclusively producers of OLED TVs (Sony OLED TVs utilization LG OLED panels) for the US market, the Quantum Dot option to the color enhancement offered past times Nanosys as well as 3M could permit LCDs to proceed to dominate the marketplace for years as well as decades to come.
Next fourth dimension you lot move past times away to purchase a TV, banking company fit if it has the "Color IQ", "QLED" "QD", "QDT", "Quantum" or a similar label on the gear upward or inward the user manual - which says... the TV uses Quantum Dot technology.
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