OLED

What is OLED?

OLED ("Organic light emitting diodes") displays are considered as the screens of the future.

Organic light emitting diodes have been receiving a lot of attention over
the world as a new type of display technology. OLEDs have many advantages over
conventional display technologies.

The first company which want to develop Oleds was Kodak in 1987.

Thin organic layers serve these displays as a source of light, which offers significant advantages in relation to conventional technologies:

* brighter and more brilliant picture
* unlimited viewing angle
* low power consumption
* economic production
* fast "response time"

OLED displays stack up several thin layers of materials. They operate on the attraction between positively and negatively charged particles. When voltage is applied, one layer becomes negatively charged relative to another transparent layer. As energy passes from the negatively charged (cathode) layer to the other (anode) layer, it stimulates organic material between the two, which emits light visible through an outermost layer of glass."

OLED-Television

The XEL-1 is an 11 inch display that is only 3mm thin. The measurements of the XEL-1 are 287×253×140mm.
Sony has put the ultra-thin display on a pedestal with a flexible arm. At 11 inch the Sony XEL-1 is a nice stylish desk accessory.
The latest OLED TV (XEL-1), which weighs two kilograms and is about 3mm thin, features a resolution of 940×540 and contrast ratio of 1,000,000:1, stated Sony.

Samsung SDI is also a big player in the AMOLED market.AMOLED applies independent R,G,B driving method unlike PMOLED which makes possible of high density & precision display. The cost for the equipment and materials of AM type is relatively expansive caused by its complex processes compared to PM method; however, AMOLED is prospected to have the world market in next-generation displays of post-TFT LCD, regardless of those disadvantages thanks to its low power consumption, high density & precision, quick response time, wide viewing angle, and slim design.

Samsung-SDI see that AMOLED comes in more medium and large-size applications – such as for monitor, notebook and TV – will adopt AMOLED panels in 2009, and in 2010, flexible display applications!

21-inch Prototyp XEL-2 from Sony

LG Display 15 inch OLED Panel Prototype

OLED lighting

Organic light-emitting diodes are composed of a stack of organic layers (thickness about 100 nm), which are connected on both sides by electrodes. Usually an OLED consists of a glass pane with a transparent conductive oxide layer, whereupon follow several layers of organic emitting, hole transport, and electron transport materials. Afterwards follows the inorganic cathode. Substantial advantages of the organic luminescence are the chemical variability of the organic light-emitting diodes and the thin film system (extremely low material expense).

OLEDs are a flat light source, emitting diffuse light from a potentially large active area. OLEDs do not need light distribution elements, thus reducing the cost for the whole lighting panel. In contrast, LEDs are a point source technology which needs light distribution elements to disperse the light evenly on large areas. Additionally OLEDs use low peak brightness on large area, LEDs provide very high brightness on a small area, which often causes glares.