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LED LCDs (sometimes marketed as LEDs) are still LCDs

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Old 06-30-2010, 11:48 AM   #1
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Default LED LCDs (sometimes marketed as LEDs) are still LCDs

There is a lot of deceptive marketing in the electronics industry, and one of them is marketing LED LCDs as LED displays.

They are not LED displays, but rather LCDs which come either LED backlit or LED sidelit, as opposed to CCFL backlit.

This is often abbreviated on the forums as simply LED, to differentiate between LED LCDs and CCFL LCDs, but make no mistake, they are still LCDs.

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LED-backlight LCD television (called LED TV by Samsung Electronics, Panasonic, Toshiba, Philips, LG Electronics, ProScan and Vizio and not to be confused with true LED displays) is an LCD TV that uses LED backlighting[1] rather than fluorescent lights used in traditional LCD televisions.

The LEDs can come in two forms, Dynamic RGB LEDs which are positioned behind the panel, or white Edge-LEDs positioned around the rim of the screen which use a special diffusion panel to spread the light evenly behind the screen.

Contents
1 LED Backlighting Techniques
1.1 RGB Dynamic LEDs
1.2 Edge-LEDs
2 Differences between LED-backlit and CCFL-backlit LCD displays
3 Technology

1. LED Backlighting Techniques:
1.1 RGB Dynamic LEDs
This method of backlighting allows dimming to occur in locally specific areas of darkness on the screen. This can show truer blacks, whites and PRs[clarification needed] at much higher dynamic contrast ratios, at the cost of less detail in small bright objects on a dark background, such as star fields.[3]

1.2 Edge-LEDs
This method of backlighting allows for LED-backlit TVs to become extremely thin. The light is diffused across the screen by a special panel which produces a uniform color range across the screen.

Sharp also has LED backlighting technology that aligns the LEDs on back of the TV like the RGB Dynamic LED backlight, but it lacks the local dimming of other sets.[4]

2. Differences between LED-backlit and CCFL-backlit LCD displays

LED-backlit LCD TVs differ from conventional CCFL-backlit LCD TVs in the following:
  1. They can produce an image with greater dynamic contrast compared with CCFL-backlit LCD TVs.[5]
  2. With Edge-LED lighting they can be extremely slim. Current models on the market can be approximately one inch thick.
  3. They can offer a wider color gamut, especially when RGB-LED backlighting is used.
  4. Lesser environmental pollution on disposal.
  5. Higher cost due to current market product placement.
  6. Generally have a lower power consumption in the realm of 20-30%.
3. Technology
TV manufacturers can use an LED backlight instead of the standard Cold Cathode Fluorescent Lamps (LCD-CCFL) used in most LCD televisions. It is important to distinguish this method of simply backlighting a conventional LCD panel, from a hypothetical true LED display, or an OLED display. LCD-based televisions described as 'LED TVs' are vastly different from self-illuminating OLED, OEL or AMOLED display technologies. In terms of the use of the term 'LED TV' in the UK, the ASA (Advertising Standards Authority) has made it clear in prior correspondence that it does not object to the use of the term, but does require it to be clarified in any advertising. 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 positioned behind the panel; and Edge-LED lighting, which uses white LEDs arranged around the inside frame of the TV along with a special light diffusion panel designed to spread the light evenly behind the LCD panel.

An LED backlight offers several general benefits over regular CCFL backlight TVs, typically higher brightness. Compared to regular CCFL backlighting, there may also be benefits to color gamut. However advancements in CCFL technology mean wide color gamuts and lower power consumption are also possible. The principal barrier to wide use of LED backlighting on LCD televisions is cost.

The variations of LED backlighting do offer different benefits. The first commercial LED backlit LCD TV was the Sony Qualia 005 (introduced in 2004). This featured RGB LED arrays to offer a color gamut around twice that of a conventional CCFL LCD television (the combined light output from red, green and blue LEDs produces a more pure white light than is possible with a single white light LED). RGB LED technology continues to be used on selected Sony BRAVIA LCD models, with the addition of 'local dimming' which enables excellent on-screen contrast through selectively turning off the LEDs behind dark parts of a picture frame.

Edge LED lighting was also first introduced by Sony (September 2008) on the 40 inch BRAVIA KLV-40ZX1M (referred to as the ZX1 in Europe). The principal benefit of Edge-LED lighting for LCD televisions is the ability to build thinner housings (the BRAVIA KLV-40ZX1M is as thin as 9.9mm). Samsung has also introduced a range of Edge-LED lit LCD televisions with extremely thin housings.

LED-backlit LCD TVs are considered a more sustainable choice, with a longer life and better energy efficiency than plasmas and conventional LCD TVs.[6] Unlike CCFL backlights, LEDs also use no mercury in their manufacture. However, other elements such as gallium and arsenic are used in the manufacture of the LED emitters themselves, meaning there is some debate over whether they are a significantly better long term solution to the problem of TV disposal.

Because LEDs are able to be switched on and off more quickly than CCFL displays 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 a high brightness (LEDs on), however care should be taken with measurements made from pure black and pure white outputs, as technologies like Edge-LED lighting do not allow these outputs to be reproduced simultaneously on-screen.

In September 2009 Nanoco Group announced that it has signed a joint development agreement with a major Japanese electronics company under which it will design and develop quantum dots for LED Backlights in LCD televisions.[7] Quantum dots are valued for displays, because they emit light in very specific gaussian distributions. This can result in a display that more accurately renders the colors that the human eye can perceive. Quantum dots also require very little power since they are not color filtered.
http://en.wikipedia.org/wiki/LED-backlit_LCD_television
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Old 07-14-2010, 06:39 PM   #2
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I was in BB this morning and just was reading the flyer that I picked up on the way out.

The term "LED TV" is used blatantly throughout the flyer, with absolutely no footnotes or even mention that they are LCDs...
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Old 07-17-2010, 04:04 AM   #3
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Good article. Correct me if I'm wrong but aren't almost all LED/LCD's side lit?

I do agree it is quite misleading. The only reasoning I can see them doing it is because saying "LED/LCD" over and over sounds weird.
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Old 07-17-2010, 01:14 PM   #4
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It's just easier to say LED rather than LED/LCD. Just like an SUV is a type of vehicle, it's still a vehicle at its most basic description. SUV is a little more specific just like LED is a little more specific. If people are uneducated about LEDs, that's their problem and fault.
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Old 07-17-2010, 02:44 PM   #5
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Originally Posted by JoeB4ever View Post
Good article. Correct me if I'm wrong but aren't almost all LED/LCD's side lit?

I do agree it is quite misleading. The only reasoning I can see them doing it is because saying "LED/LCD" over and over sounds weird.
All the early LED lit LCDs were backlit and not edgelit. Edgelighting came about because it was cheaper to implement and allowed displays to get thinner. I just do not get what benefit comes from going from 3-4" deep down to 1.5" deep especially when you lose PQ compared to the backlit w/local dimming.

Conventional LCDs are ALL backlit with a diffuser board to spread the lighting (close) to evenly behind the LCD array. They can only get close which is WHY there are hot spots easily seen with a dark scene on screen. Edgelit LCDs also use a diffuser board like conventional florescent backlighting whereas a local dimming backlit LED array behind the LCD array does not have this. But they cost more money and have other issues like blooming, and missing some details when a screen is mostly black/dark like in a space scene where many of the stars never show up on the screen.
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Old 07-27-2010, 11:33 AM   #6
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Looking at a new bedroom tv, have 40 inch sony now, like it because i dont wanna add outside speakers and this one has good speakers

When i look at costco.com where i will buy whatever i buy, i see a lot of led and edge lit stuff, reading that edge lit is actually inferior to back lit, and the only advantage of edge lit is thinner set, then only a pure led would be better than any lcd, I assume...

Gets complicated, speakers are so important and hard to judge when you are in the store...

thanks...
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Old 08-09-2010, 04:06 PM   #7
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Quote:
Originally Posted by randys1 View Post
Looking at a new bedroom tv, have 40 inch sony now, like it because i dont wanna add outside speakers and this one has good speakers

When i look at costco.com where i will buy whatever i buy, i see a lot of led and edge lit stuff, reading that edge lit is actually inferior to back lit, and the only advantage of edge lit is thinner set, then only a pure led would be better than any lcd, I assume...

Gets complicated, speakers are so important and hard to judge when you are in the store...

thanks...
There is no "PURE" LED sets, all LED's are LCD sets w/LED (light emitting Diodes)as a lighting method used on the LED-LCD panels,(Their are two methods of LED > edge-lit and Local dimming, local dimming is the better of the two) and not CLF Florescent lighting.
this may help you understand the difference
http://www.lcdtvbuyingguide.com/hdtv/led-vs-lcd.html
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Old 08-10-2010, 02:17 PM   #8
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if you mean a pure backlit LCD, then you would be right, edgelit LED LCD's are inferior to most normal CCFL-LCD TV's, whereas locally dimmed full backlit models, are superior, and start coming close to plasma quality.

but you pay BIG bucks for those.
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Old 08-10-2010, 03:24 PM   #9
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if you mean a pure backlit LCD, then you would be right, edgelit LED LCD's are inferior to most normal CCFL-LCD TV's, whereas locally dimmed full backlit models, are superior, and start coming close to plasma quality.

but you pay BIG bucks for those.
The best LED-LCD made was the Sony XBR8, an RBG-LED(local dimming) LCD the tri-colored leds made an amazing difference but, it suffered in it's market acceptance much as like the Pioneer Plasma did, in that it out-priced itself for the HD-Buying market.
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Old 08-10-2010, 04:24 PM   #10
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Originally Posted by ImRizzo View Post
The best LED-LCD made was the Sony XBR8, an RBG-LED(local dimming) LCD the tri-colored leds made an amazing difference but, it suffered in it's market acceptance much as like the Pioneer Plasma did, in that it out-priced itself for the HD-Buying market.
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Old 08-10-2010, 04:36 PM   #11
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How was the picture quality of the XBR8 compared to say the kuro or the vt20?
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Old 08-10-2010, 04:52 PM   #12
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How was the picture quality of the XBR8 compared to say the kuro or the vt20?
The XBR8 was the closet thing to a Kuro.
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Old 08-10-2010, 05:07 PM   #13
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How was the picture quality of the XBR8 compared to say the kuro or the vt20?
Nothing could compare to a Kuro, but it was an absolute stunning display. And rated the Very best LED/LCD by HomeTheaterMagazine and CNET and many other rating facilities.
PQ example:


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Old 09-06-2010, 06:31 PM   #14
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Gotta admit, I still like my Samsung B8500 better. Doubling the number of locally dimmed zones did a lot to minimize the artifacts. No argument, though, that the XBR8 was an absolute beauty of a TV and the one I would have chosen had it not been for the B8500.

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Old 09-06-2010, 06:35 PM   #15
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Gotta admit, I still like my Samsung B8500 better. Doubling the number of locally dimmed zones did a lot to minimize the artifacts. No argument, though, that the XBR8 was an absolute beauty of a TV and the one I would have chosen had it not been for the B8500.

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