oRGANIC lIGHT
eMITTING dEVICE
Organic Light Emitting Device (OLED) technology is emerging as a leading next-generation technology for electronic displays and lighting. The leading technology for a new generation gives thinner, lighter, higher-resolution displays for computers, televisions and small hand-held devices. In addition, OLED’s could enable the development of new display applications including flexible plastic display devices, displays embedded into clothes or wall hangings and even head-mounted displays. OLED’s are the emission of light from thin films of organic materials as a result of electrical excitation. It occurs in (OLED’s) when electrons are injected from an electrode on one side of the film and holes from the other, and an exciton (a bound state) is formed from the capture of oppositely charged carriers that can decay radiatively. OLED’s arisen from two main technology branches – on the one hand, we have small molecule devices, and on the other, those based on small molecules and light-emitting polymers.
OLED displays are garnering attention for use in such mobile devices as digital cameras. These self-emitting displays are based on the phenomenon of organic electroluminescence, which occurs when voltage is applied to excite organic materials sandwiched between two electrodes. When the materials revert to their original state after being excited, they release energy as light. Because they are self-emitting, these displays are remarkably bright and unlike liquid crystal displays, offer a wide angle of view. Additionally, the technology features fast response speeds and emits light while generating virtually no heat, ensuring low power consumption and making them ideally suited for use in mobile devices.
Philips states that big advantage of the manufacturing process is its simplicity and therefore its potential for the low cost, only a very limited number of process steps are required. This procedure requires fewer manufacturing steps than the manufacturing of LCD’s more importantly, fewer materials are used. In fact, the whole display can be built on one sheet of glass or plastic, so it should be cheaper to manufacture.
Philip’s thin-film polyLED technology will enable the production of full-color displays less then 1mm thick. Combined with a large viewing angle, high brightness and contrast and full video capability, PolyLED displays are ideal for the next generation of information displays.
OLED’s are presently very crucially used in Laptops because it consumes low power in comparison to the LED’s. Due to this special property of OLED’s the Laptops can be used for long time and there will be no need of heavy batteries.
