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Because LEDs can be switched on and off more quickly than CCFLs and can offer a higher light output, it is theoretically possible to offer very high contrast ratios. They can produce deep blacks (LEDs off) and high brightness (LEDs on). However, measurements made from pure-black and pure-white outputs are complicated by edge-LED lighting not allowing these outputs to be reproduced simultaneously on screen.[clarification needed]
Using PWM (pulse-width modulation), a technology where the intensity of the LEDs are kept constant but the brightness adjustment is achieved by varying a time interval of flashing these constant light intensity light sources,[26] the backlight is dimmed to the brightest color that appears on the screen while simultaneously boosting the LCD contrast to the maximum achievable levels, drastically increasing the perceived contrast ratio, increasing the dynamic range, improving the viewing angle dependency of the LCD and drastically reducing power consumption.[clarification needed]
The premium technology of choice for any laptop, Acer Swift OLED displays offer vivid colors, sharp contrast, steady motion clarity, and so much more. Delivering an immersive OLED laptop viewing experience that’s perfect for entertainment or productivity.
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Full-array mini-LED backlights, consisting of several thousand WLEDs, were being researched for TVs and mobile devices in 2017.[36]
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Professionally calibrated and certified by TÜV Rheinland, Acer Swift OLED displays balance blue light limitations and keep potential eyestrain to a minimum—for more comfortable, extended viewing.
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LED backlights are often dimmed by applying pulse-width modulation to the supply current, switching the backlight off and on more quickly than the eye can perceive. If the dimming-pulse frequency is too low or the user is sensitive to flicker, this may cause discomfort and eyestrain similar to the flicker of CRT displays at lower refresh rates.[46] This can be tested by simply waving a hand in front of the screen; if it appears to have sharply-defined edges as it moves, the backlight is pulsing at a fairly low frequency. If the hand appears blurry, the display either has a continuously-illuminated backlight or is operating at a frequency too high to perceive. Flicker can be reduced (or eliminated) by setting the display to full brightness, although this can degrade image quality and increases power consumption.[citation needed]
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With Acer Swift OLED laptops, each pixel is self-emitting—resulting in a 1,000,000:1 superior contrast ratio, with deeper blacks and brighter whites that reveal even the smallest of details.
LED backlights replace CCFL (fluorescent) lamps with a few to several hundred white, RGB or blue LEDs. An LCD with LED-Backlight may be edge- or direct-lit:[9]
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Acer Swift OLED laptops feature super slim bezels—providing increased screen real estate and lighter, thinner form factors that look good and turn heads wherever you go.
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A 2016 study by the University of California (Berkeley) suggests that the subjectively perceived visual enhancement with common contrast source material levels off at about 60 LCD local dimming zones.[11]
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The evolution of energy standards and the increasing public expectations regarding power consumption made it necessary for backlight systems to manage their power. As for other consumer electronics products (e.g., fridges or light bulbs), energy consumption categories are enforced for television sets.[21] Standards for power ratings for TV sets have been introduced, e.g., in the US, EU, Australia,[22] and China.[23] A 2008 study[24] showed that among European countries power consumption is one of the most important criteria for consumers when they choose a television, as important as the screen size.[25]
LED-backlit LCDs are not self-illuminating (unlike pure-LED systems). There are several methods of backlighting an LCD panel using LEDs, including the use of either white or RGB (Red, Green, and Blue) LED arrays behind the panel and edge-LED lighting (which uses white LEDs around the inside frame of the TV and a light-diffusion panel to spread the light evenly behind the LCD panel). Variations in LED backlighting offer different benefits. The first commercial full-array LED-backlit LCD TV was the Sony Qualia 005 (introduced in 2004),[12][13][14][15][16] which used RGB LED arrays to produce a color gamut about twice that of a conventional CCFL LCD television. This was possible because red, green and blue LEDs have sharp spectral peaks which (combined with the LCD panel filters) result in significantly less bleed-through to adjacent color channels. Unwanted bleed-through channels do not "whiten" the desired color as much, resulting in a larger gamut. RGB LED technology continues to be used on Sony BRAVIA LCD models. LED backlighting using white LEDs produces a broader spectrum source feeding the individual LCD panel filters (similar to CCFL sources), resulting in a more limited display gamut than RGB LEDs at lower cost.[citation needed]
When the individual pixels on an Acer Swift OLED display emit black, they are turned off—effectively lowering power consumption and allowing for more efficient battery management.
Ensures that everything on your HDR video comes to life—with vibrant colors and stunning contrast for eye-popping realism.
4 Apr 2023 — LED displays generally have better color accuracy and energy efficiency than LCD displays, but they are also more expensive.
The Model JT-200 Ground Jumper Tester is portable and lightweight to perform in-service testing of temporary grounding jumper assemblies.
Television sets described as "LED TVs" are LCD-based, with the LEDs dynamically controlled using the video information[17] (dynamic backlight control or dynamic "local dimming" LED backlight, also marketed as HDR, high dynamic range television, invented by Philips researchers Douglas Stanton, Martinus Stroomer and Adrianus de Vaan[18][19][20]
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DCI-P3 can display a wider range of colors than sRGB color space—allowing for more accurate and vibrant color reproduction.
The white LEDs in LED backlights may use special silicate phosphors, which are brighter but degrade faster.[37] The size of the LEDs is one of the factors that determines the size of the bezel of LED-backlit LCDs.[38]
Additionally a special diffusion panel (light guide plate, LGP) is often used to spread the light evenly behind the screen.
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Self-lit pixels on Acer Swift OLED displays independently switch off to produce an immersive and true black level of darkness.
A first dynamic "local dimming" LED backlight was public demonstrated by BrightSide Technologies in 2003,[33] and later commercially introduced for professional markets (such as video post-production).[34] Edge LED lighting was first introduced by Sony in September 2008 on the 40-inch (1,000 mm) BRAVIA KLV-40ZX1M (known as the ZX1 in Europe). Edge-LED lighting for LCDs allows thinner housing; the Sony BRAVIA KLV-40ZX1M is 1 cm thick, and others are also extremely thin.[citation needed]
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An LED-backlit LCD is a liquid-crystal display that uses LEDs for backlighting instead of traditional cold cathode fluorescent (CCFL) backlighting.[1] LED-backlit displays use the same TFT LCD (thin-film-transistor liquid-crystal display) technologies as CCFL-backlit LCDs, but offer a variety of advantages over them.
With cinema-grade color accuracy, Acer Swift OLED laptops ensure colors on-screen are true to the original intent of content creators.
The prismatic and reflective polarization films are generally achieved using so called DBEF films manufactured and supplied by 3M.[30][31] These reflective polarization films using uniaxial oriented polymerized liquid crystals (birefringent polymers or birefringent glue) were invented in 1989 by Philips researchers Dirk Broer, Adrianus de Vaan and Joerg Brambring.[32]
Is the sky too blue or the grass too green? Never again with Acer Swift OLED displays—which produce brilliant, true-to-life colors that take your viewing experience to the next level.
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Covering the full range of the DCI-P3 color space, Acer Swift OLED laptops bring what you’re watching to life in over a billion colors.
Mini LED displays are LED-backlit LCDs with mini-LED–based backlighting supporting over a thousand full array local dimming (FALD) zones, providing deeper blacks and a higher contrast ratio.[44] An example of a product that uses Mini LED backlighting is Apple's 2021 year 12.9 inch iPad Pro.[45]
Acer Swift OLED laptops boast ultra-fast response times and refresh rates, so you can enjoy smooth, blur-free movement in the content you love to consume or create.
Captivating images, blockbuster movies, and everything in between comes to life with incredible clarity and detail on stunning 4K Acer Swift OLED displays.
LED-backlit LCDs have longer life and better energy efficiency than plasma and CCFL LCD TVs.[35] Unlike CCFL backlights, LEDs do not use mercury in their manufacture, which is an environmental pollutant. However, other elements (such as gallium and arsenic) are used in the manufacture of the LED emitters; there is debate over whether they are a better long-term solution to the problem of screen disposal.[citation needed]
The local dimming method of backlighting allows to dynamically control the level of light intensity of specific areas of darkness on the screen, resulting in much higher dynamic-contrast ratios, though at the cost of less detail in small, bright objects on a dark background, such as star fields or shadow details.[10]
The combination of LED dynamic backlight control[18] in combination with reflective polarizers and prismatic films (invented by Philips researchers Adrianus de Vaan and Paulus Schaareman[27] make these "LED" (LCD) televisions far more efficient than the previous CRT-based sets, leading to a worldwide energy saving of 600 TWh in 2017, equal to 10% of the electricity consumption of all households worldwide, or twice the energy production of all solar cells in the world.[28][29]
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Backlit LCDs cannot achieve true blacks for pixels, unlike OLED and microLED displays. This is because even in the "off" state, black pixels still allow some light from the backlight through. Some LED-backlit LCDs use local dimming zones to increase contrast between bright and dim areas of the display, but this can result in a "blooming" or "halo" effect on dark pixels in or adjacent to an illuminated zone.[3]
Fast-moving objects are sharper and less distorted on Acer Swift OLED laptops, resulting in a smoother, more enjoyable viewing experience.
Quantum dots are photoluminescent; they are useful in displays because they emit light in specific, narrow normal distributions of wavelengths. To generate white light best suited as an LCD backlight, parts of the light of a blue-emitting LED are transformed by quantum dots into small-bandwidth green and red light such that the combined white light allows a nearly ideal color gamut to be generated by the RGB color filters of the LCD panel. The quantum dots may be in a separate layer as a quantum dot enhancement film, or replace pigment-based green and red resists normally used in LCD color filters. In addition, efficiency is improved, as intermediate colors are no longer present and do not have to be filtered out by the color filters of the LCD screen. This can result in a display that more accurately renders colors in the visible spectrum. Companies developing quantum dot solutions for displays include Nanosys, 3M as a licensee of Nanosys, QD Vision of Lexington, Massachusetts, US and Avantama of Switzerland.[39][40] This type of backlighting was demonstrated by various TV manufacturers at the Consumer Electronics Show 2015.[41] Samsung introduced their first 'QLED' quantum dot displays at CES 2017 and later formed the 'QLED Alliance' with Hisense and TCL to market the technology.[42][43]
Televisions that use a combination of an LED backlight with an LCD panel are sometimes advertised as LED TVs, although they are not truly LED displays.[1][2]
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A high refresh rate means images are updated more frequently, allowing for more detail to be seen in fast-moving scenes on Acer Swift OLED displays.
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