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OLED display structure and features are introduced

OLED display is an application of OEL display technology. Over the past decade, more and more scientific forces have been devoted to the development of OLED technology, and OLED display structure and OLED display technology have become more and more mature. Currently, OLED display plays an irreplaceable role in People's Daily life. Based on the wide application of OLED display screen, the structure and characteristics of OLED display screen are briefly analyzed in this chapter.

To illustrate the OLED display structure, each OLED cell can be compared to a hamburger, and the glowing material is a vegetable in the middle. Each OLED display unit can be controlled to produce three different colors of light. OLED and LCD, as well as active and passive. The cell selected by the column address is lit in passive mode. In the active mode, there is a thin film transistor (TFT) behind the OLED unit, and the luminescent unit lights up under the TFT drive. Active OLED is more power efficient, but passive OLED displays better.

OLED display screen consists of the following parts:

Base (transparent plastic, glass, metal foil) - the base is used to support the whole OLED.

Anode (transparent) - the anode eliminates electrons (increases electron holes) as the current flows through the device.

Organic layer - the organic layer is composed of organic molecules or organic polymers.

Conductive layer - the layer consists of organic plastic molecules that transmit holes from the anode. Polyaniline can be used as the conductive polymer of OLED.

Emission layer - this layer consists of organic plastic molecules (unlike conductive layers) that transmit electrons from the cathode; The process of luminescence takes place in this layer. Polyfluorene can be used as the emitter polymer.

The cathode (which can be transparent or opaque, depending on the OLED type) - when there is current flowing through the device, the cathode pumps electrons into the circuit.

OLED display features

OLED, the organic light emitting diode (OrganicLight - EmittingDiode), also known as organic laser display (OrganicElectroluminesenceDisplay, OELD). Since 2003, this display device has been widely used in MP3 players due to its thin and light, power-saving features. For DC and mobile phones, which belong to the same digital category, only engineering samples of OLED screens have been shown at some exhibitions, but have not yet entered the stage of practical application. However, OLED screen has many advantages that cannot be compared with LCD, so it has been valued by the industry.

OLED is a kind of self-luminous material, which does not need to be used on the back light plate. At the same time, it has a wide perspective, uniform picture quality, fast reaction speed, easy color, and can be achieved by simple driving circuit. With simple manufacturing process, it can be made into flexible panel, which conforms to the principle of being light and short.

Display: active luminescence, wide range of vision; Fast response speed and stable image; High brightness, rich color, high resolution.

Working conditions: low driving power and low energy consumption, which can be matched with solar cells and integrated circuits.

Wide adaptability: large area plate display can be realized by using glass substrate; If the substrate is made of flexible material, it can be made into flexible display. Because OLED are all solid state, the vacuum device, shock resistance, resistance to low temperature 40 ℃ (-), and other characteristics, has very important application in military aspects, such as used as modern weapons such as tanks, aircraft display terminal.

OLED display technology differs from traditional LCD display, with no backlight and a very thin coating of organic material and glass substrate that glows when an electric current passes. And OLED displays can be made lighter and thinner, have larger viewing angles, and can significantly save power.

Currently, in the second major technology system of OLED, low-molecular-oled technology is mastered by Japan, while the so-called OEL of polymer PLEDLG phone is this system. The technology and patents are mastered by CDT, a technology company in the UK, and they are still difficult to be compared with the color of PLEDLG products. Low molecular OLED is easier to color.

However, although OLED with better technology will replace LCDS such as TFT in the future, the organic light-emitting display technology still has some disadvantages such as short service life and difficulty in large screen size.

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