Wednesday, April 30, 2008

Green TV

There is a price to going green. Hopefully green products will come down in price on day. I thought this was the first in a list of green electronics and homeware.

What is OLED
OLED stands for Organic Light Emitting Diode. The "organic" in OLED refers to organic material. Carbon is the basis of all organic matter. Examples of carbon-based substances include sugar, wood and the majority of plastics. The "LED" stands for "Light Emitting Diode" and describes the process of converting electric energy into light. There are two types of OLED ? small molecule OLED and polymer OLED. Sony uses the small molecule type because it has a longer lifespan.
How does OLED work
A layer of organic material is sandwiched between two conductors (an anode and a cathode), which in turn are sandwiched between a glass top plate (seal) and a glass bottom plate (substrate). When electric current is applied to the two conductors, a bright, electro-luminescent light is produced directly from the organic material.
How is colour created
OLED has more control over colour expression because it only expresses pure colours when an electric current stimulates the relevant pixels. The OLED primary colour matrix is arranged in red, green, and blue pixels, which are mounted directly to a printed circuit board. Each individual OLED element is housed in a special “micro-cavity” structure designed to greatly reduce ambient light interference that also works to improve overall colour contrast. The thickness of the organic layer is adjusted to produce the strongest light for each of the colours ? red, green and blue - used to render the colour picture. The three colours are further refined by a colour filter, which purifies each colour without the need for a polarizer, rendering outstanding colour purity

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