New TV Tech: OLED and Quantum Dot

When the new 2015 televisions start to arrive at electronics shops, A/V showrooms, and online stores, TV buyers will be faced with an assortment of new technology terms and decisions. One of the most important questions buyers always ask is “what’s the best flat-panel TV?”

If you had asked me that a year or two or more ago, I would have easily been able to answer—buy a plasma TV. And in most cases, the best plasma TVs were from Panasonic. But those days are gone. No more plasma.

This doesn’t mean that the days of really great TVs are gone, though. LED TVs have improved considerably since the first washed-out and blotchy sets arrived years ago, thanks to features like in-plane switching (IPS) and local dimming. Even better, new (or newish) technologies are hitting stores that have the potential to produce the best TV pictures we’ve ever seen. I’m talking about OLED and nano crystal (a.k.a. quantum dot, SUHD, etc.). Both new display technologies produce great-looking pictures, and they’re not merely concepts anymore—they’re real TVs. You may hear some manufacturers comparing the two (claiming the technology they support is better than the other, of course), so let’s delve deeper into both so you know what you’re looking at when it comes time to shop.

For this discussion, we need to first focus on two words: emissive and transmissive. TVs that rely on emissive light—meaning that the image itself produces the TV’s light—include CRT TVs (which can only be found in garage sales or my father’s rec room) and plasma TVs. Both CRT TVs and plasma TVs use phosphors that light up more or less on the screen surface. Transmissive TVs, on the other hand, have a light source behind them that produces the light and passes it through filters and whatnot. All LCD TVs are transmissive. The original CCFL LCD TVs used cold-cathode fluorescent lamps either behind or on the sides of the TVs. This light is transmitted from the lamp source, through the TV’s liquid crystals, and also through color filters. With LED-based LCD TVs, the CCFL part has been replaced by LED lights that can be more accurately controlled and somewhat locally dimmed.

What is OLED?
An OLED TV uses a layer of light emitting material within the panel of the TV. The light-producing part of the panel is composed of an organic matter, such as carbon. This is an emissive technology because the TV’s image actually produces the light. However, there are two ways to manufacture OLED TVs. One is LG’s method, called WRGB, which uses all white OLEDs behind color filters. The other method used red, green, and blue OLEDs. The latter is more expensive and has proved difficult to produce in quantities to make it cost effective for large TVs.

Benefits of OLED
Because individual OLED elements can be turned on and off, the technology produces near perfect black levels. They’re also plenty bright and don’t easily wash out in a bright room. The contrast on an OLED is incredible. OLED TVs also offer very wide viewing angles, so the image doesn’t diminish when you move to the side.

OLED sounds great, right? Well, it should. Last year both LG’s and Samsung’s OLED TVs tied for first place in the Value Electronics HDTV shootout. The downside is their cost. OLED TVs, on a dollar per inch basis, are among the most expensive, although they’re coming down significantly from the $15,000 55-inch models that initially launched in 2013.

LG is currently the main force behind OLED. Samsung also offers them, but is much more bullish on nano crystals, which brings us to…

What Are Nano Crystals or Quantum Dots?
Nano crystal or quantum dot technology is a new TV technology that uses nanoscopically small crystals (5 to 20 nanometers in size) as both a light and color source. In most TV applications, nano crystals of various sizes are spread across a thin film in the LCD display panel. When commanded, they emit light in various colors depending on the size of the crystal. The result is an LCD TV that is both brighter and features more enhanced colors than a standard LED TV. Because a quantum dot TV still uses LED backlighting, these TVs essentially are a combination of both transmissive and emissive technology. While several companies, including LG, Sony, TCL, and Samsung are putting nano crystals to work in new TVs, Samsung is probably the biggest backer of the technology and calls all of its nano crystal TVs SUHD (the UHD stands for Ultra High Definition, but the S—who knows?).

The Benefits of Quantum Dot
Quantum dot TVs offer many of the same benefits as OLED (brighter picture, richer colors) but for less money. For example, LG’s 65-inch 4K EG9600 OLED TV costs $8,999 while Samsung’s 65-inch 4K JS9500 SUHD costs $5,999.

Quantum dot TVs are still LED LCD TVs, and so they may exhibit some of the issues that plague some LED LCD TVs, such as uneven backlighting and somewhat narrow viewing angles. But for now, at least, the TVs that are getting the quantum dot treatment are the manufacturers’ premium sets, so expect to see them come with the best features, such as small zone local dimming and in-plane switching panels.

Both of the above technologies will be featured in 4K Ultra HD TV sets. In 2014 LG and Samsung offered OLED in 1080p models, and those models persist in 2015, but expect 4K to take over the territory soon.

And what about those curves? Both of the above TV technologies will be appearing in curved TVs this year. Despite how manufacturers pitch it, the curve is a design feature rather than a picture enhancement feature. If you like the look, go for it. If not, then sit on your hands until the curve fad wears itself out. EH