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Different types of OLED

Views: 263     Author: Wendy     Publish Time: 2023-06-16      Origin: Site

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Different types of OLED

What does AMOLED mean?

Active matrix organic light emitting diode panels are known as AMOLEDs (Active Matrix/Organic Light Emitting Diode). Tiny organic molecules that make up AMOLED screens emit light when an electrical current is applied.  

An amoled module's display and controlling circuitry are one unit. This normally consists of a controller and driver circuit that may transmit signals to specific display pixels to regulate their brightness and hue.

An AMOLED display allows each pixel to independently generate light, in contrast to LCD displays that rely on a backlight to illuminate the panel.This enables more intense colors, deeper blacks, and higher contrast ratios than LCD screens. AMOLED displays perform better than conventional LCD screens in terms of reaction time, contrast ratio, and viewing angle. These are the applications where AMOLED naturally outperforms TFT LCD. AMOLED may also be made thinner and lighter than TFT and uses less electricity because it self-illuminates and doesn't require a backlight board; AMOLED, which does not require a backlight board, can reduce costs by eliminating the backlight module, which makes up 34 of the TFT LCD.The best display technology to replace TFT-LCD is AMOLED.

How many different varieties of OLED are there?

1. Sort the gadget based on its structure

A gadget known as an organic LED uses somewhat specialized organic components to produce light. It may be broken down into four different varieties based on its structure: single-layer devices, double-layer devices, three-layer devices, and multi-layer devices.

A single-layer gadget

A single-layer device's structure is substrate/ITO/light-emitting layer/cathode, and it consists of an organic layer that may emit light between the positive and negative electrodes of the device. Due to the imbalanced injection and transit of electrons and holes in this configuration, the device's efficiency and brightness are low, and it has poor stability.

Device with two layers

The single-layer device serves as the foundation for the double-layer device, which enhances the device by adding a hole transport layer (HTL) or an electron transport layer (ETL) on each side of the light-emitting layer. This solves the imbalanced carrier injection issue that plagues the single-layer device. The voltage-current characteristic raises the device's luminance efficiency.

A three-layer gadget

The most popular device structure is a three-layer one with the following layers: a substrate, an ITO layer, a light-emitting layer, an ETL layer, and a cathode. The benefit of this arrangement is that the confinement of the excitons in the light-emitting layer increases the device's effectiveness.

Multiple layers

A multi-layer structure that can effectively fill the roles of each level has a performance that is generally good. The light-emitting layer may alternatively be made up of many layers, with each light-emitting layer being independent of the others and allowing for independent optimization. As a result, this structure may fully use each organic layer, considerably increasing the design freedom of the device.

2. Sort based on driving mode

OLEDs are commonly split into two varieties, active and passive, depending on the driving technique. The passive type is often passive drive, whereas the active type typically uses active drive. Active drivers are often employed in the application process for high-resolution products, whereas passive drivers are typically used in displays with relatively modest display sizes.

3. Sort the information by category

The majority of the components of an OLED are organic chemicals, which may be further classified into two categories: small molecules and macromolecules. The manufacturing technique is the primary distinction between these two devices. While the polymer device uses spin coating or spray printing, the small molecule device mostly uses vacuum thermal evaporation.

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