OLED/PLED-Info Website --> OLED-Display.net (Organic light emitting diode)


novaled oled-info future-technologies

This site inform you about Organic LEDs (OLED/PLED), the next display technology that promises to deliver thin, power efficient and bright displays.

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What is OLED?--> Organic light emitting diode!

At our OLED-Info website you can learn about: PMOLED,AMOLED,Transparent, Foldable, White, and OLED Light

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Future

Organic-Displays are the latest and most promising buzzwords in display technology.
To give you an idea of their potential, imagine a cardboard-thin TV screen.
Now imagine that you can roll up your TV, put it away or carry it wherever you go.

 

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History

The first organic displays that will hit the market will be Passive-matrix. The first LCD screens were passive, and OLED will follow suit. They are fairly simple structures. They will be more expensive, and consume a lot more power than other types of OLEDs. They will be found in smaller devices with screens smaller than three inches, like MP3 players and cell phones. Passive-matrix is made up of a matrix of electrically-conducting rows and columns making pixels. Between the rows and the columns are the organic layers. On the other side is the substrate, the material which gives the electricity. The more current applied, the brighter the display.

What is going to be in most displays is Active-matrix. They will consume a lot less power than passive matrix. Active-matrix is like passive, but instead of rows and columns, there is a TFT back plate. This will control the brightness of each pixel. There will be two TFT arrays per pixel: one to start and stop the charging of the capacitor, and one to provide a constant electrical current to the pixel. This means that there will be a constant current at all times, so the overall electricity needed to light the display is considerably less than that of passive matrix.

The organic films consist of a hole-injection layer, a hole-transport layer, an emissive layer and an electron-transport layer. When voltage is applied to the cell, the injected positive and negative charges recombine in the emissive layer and create electro luminescent light.
Unlike LCDs, which require backlighting, AMOLED displays are emissive devices - they emit light rather than modulate transmitted or reflected light.

Organic light emitting technology was invented by Eastman Kodak in the early 1980s.A Kodak researcher by the name of Ching Tang noticed that if you put an electrical current through an organic material, it glowed green. This is where the idea behind OLED came from. The company who brings you your film, oddly enough, owns the patents. It is beginning to replace LCD technology in handheld devices such as PDAs and cellular phones because the technology is brighter, thinner, faster and lighter than LCDs, use less power, offer higher contrast and are cheaper to manufacture.
An important step in the evolutionary process began with the use of thin-film organic layers.

The first EL thin-film device used a single organic layer sandwiched between two injecting electrodes.



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