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(Organic Light Emitting Diode) A display technology that offers bright, colorful images with a wide viewing angle, low power, high contrast ratio and fast response time for sports and action movies. OLEDs are called "organic" because the emitting layers are based on carbon rather than silicon or gallium (see OLED Cross Section diagram below).

Although OLED is a different technology, it shares similarities with LCD (LED) TVs and earlier plasma sets. Like LCD screens, white OLED (WOLED) passes light through color filters. However, RGB OLED resembles plasma screens because the red, green and blue colors are intrinsically generated. Because OLEDs do not require backlights, the screens are ultra-thin. OLEDs are also used for lighting (see OLED lighting and WOLED).

Extremely Versatile
OLEDs can be transparent, enabling them to function in heads-up displays and as window shades that react to sunlight. OLED's color, speed, thinness, transparency and flexibility make it the display technology of the 21st century.

Passive and Active OLEDs
Passive matrix OLEDs appeared in cellphones and MP3 players in the 1990s, and active matrix OLEDs followed in 2003. Four years later, Sony introduced the first active matrix OLED TV (see image below). However, significant progress was made in the next five years, and LG and Samsung debuted 55" OLED TVs in 2012. See PHOLED, AMOLED, TOLED, OLED lighting and LED.

First OLED TV - Only 11 Inches
In 2007, Sony's XEL-1 captivated audiences with intense colors, but few were sold due to its small 11" screen and whopping USD $2499 price. To enhance the thinness of the screen, it was separated from the tuner circuits. (Image courtesy of Sony Corporation.)

From 11 to 77 Inches
A huge difference in seven years. At CES 2014, several large-screen OLED HDTVs were unveiled, such as this curved 77" 4K TV from LG. See 4K TV.

OLEDs Are Monolithic Devices
OLED screens consist of a series of carbon-based "organic" layers between electrical contacts (electrodes). Like LEDs, when electrons and holes combine in the organic layer, they emit photons. Unlike LCDs, which have separate layers, each OLED layer is deposited on the other, creating a monolithic unit. Commonly constructed on glass, OLEDs can also be fabricated on plastic and flexible films, such as the Flexible OLED (FOLED) from Universal Display Corporation.

OLED Cross Section (Not to Scale)
The cathode layer can be reflective (OLED) or transparent (TOLED). OLEDs are made using small-molecule organic LEDs (SM-OLEDs) or less-expensive, lower-voltage and longer-lasting large-molecule polymer LEDs (P-OLEDs or PLEDs). (Illustration courtesy of Universal Display Corporation, www.universaldisplay.com)

A Smartphone in Your Pen?
Flexible OLED screens like this are expected within a few years. (Image courtesy of Universal Display Corporation, www.universaldisplay.com)
References in periodicals archive ?
These new organic LEDs can be brighter than regular organic LEDs.
Sumitomo Chemical is also focusing development efforts on polymer organic LED (PLED) materials, which are expected to find applications in large-screen TVs, and is setting its sights on the future development of large-screen PLED touchscreen panels as it seeks to expand its business further.
This range of luminaire concepts EoACAo tabletop, floor-standing, wall-mounted and a hanging chandelier (see image below) EoACAo uses a thin, aluminum EoACAylight bladeEoACAO, applying conventional LED and organic LED (OLED) technology.
96" area color Organic LED (OLED) for consumer and industrial applications.
This sleek new mobile in either black, purple or blue is so slim it fits into the palm of a hand comes with an organic LED display for crisper images and videos.
NOT to be outdone in the battle to make TVs as thin as possible, Sony have harnessed organic LED technology to create screens only 3mm thick .
Its design features an Organic LED main display that supports up to 16 million colours and displays light-focused screensaver graphics.
Inside rear view mirror with embedded organic LED (OLED) screen.
Organic LED displays also offer all the ruggedness of electroluminescent displays.
The model is also likely to have organic LED lighting and gesture controls.
Development in the electronics sector will drive the adoption of smart haptics, organic LED displays, encapsulation, wireless charging and near-field communication technologies as well.
This TV is a transparent Organic LED (OLED) display glass with nearly 1 million megapixels and a resolution of 1200 x 810.

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