Hall Effect Sensor Magnets for Organic Light-Emitting Diode (OLED) Deposition Apparatus, Permanent Magnets for Organic Light-Emitting Diode (OLED) Deposition Apparatus – OLED Deposition Apparatus Magnets
An organic light-emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound that emits light in response to an electric current. This layer of organic semiconductor is situated between two electrodes; typically, at least one of these electrodes is transparent.
Ever hear of the “Hall Effect Sensor”?
Hall effect devices are basicly transistors with a magneticly sensitive base lead while a normal transitor will have a wire connecting the base to the emmitter and collector junctions
However EVERY transistor and EVERY diode can be affected by magnetic fields, to some degree, this is why you take of your electronic watch when you get a CAT scan because the scanner has an enormous magnet in it.
What happens is that in a hall effect device it is optimized to sense magnetic feild changes, and what happens is that when you bring the correct pole of a magnet into proximity of the hall effect device (transistor) it turns it on, when you turn the magnet around the other way, it will shut the hall effect transistor off again.
Now your LCD screen although the screen has mainly Liquid crystal semi conductors in it tends to respond to some degree in the same way mainly for 2 reasons.
Liquid crystals are EXTREMLEY sensitive to electric field changes, so you don’t even need a magnet to see how sensitive they are. Try this; put a piece of “scotch magic brand” (tm 3M) tape (the kind you can write on) and stick it LIGHTLY onto the face of your LCD screen, leaving one end NOT stuck down so that you can pull it back off.
Whith the monitor UNPLUGGED and the VGA connector OFF rapidly pull the tape off at about a 45 degree angle away from the LCD screen.
You will see many of your LCD “pixels come to life”
That is just from non-contact static electricity.
Now if you were to take say, the magnet out of the magnetron in a microwave oven and pass it over a running LCD monitor you may induce enough magnetic pressure to short out the transistors and diodes in the Liquid crystal display (that is the first method of magnetic interaction — I said there were 2 remember?)
The second method that the magnet will cause problems is for the same reason that motors spin.
If you MOVE a magnetic field across a conductor like a wire or a circuit trace (and there are 10’s of thousands of circuit traces embedded in the LCD screen) then you will magnetically induce an electric potential on those conductors and circuit traces — you might short stuff out by turning something on when something next to it should be off
Traditional information medium, such as newspaper and magazine, is no long appreciated since mankind has been in the information age, and display technology is born. Organic light-emitting diode (OLED) has merits such as self-luminous, fast response, broad perspective, thin volume and flexibility. Organic light-emitting diode (OLED) has already applied in mobile phone, tablet, television and wearable devices nowadays.
Lighting Principle of Organic Light-Emitting Diode (OLED)
The anode is usually transparent to ensure the emergent of light. As a kind of transparent metal oxide semiconductor, indium tin oxide (ITO) is frequently used for anode. Due to incompatibility between anode and carrier transport layer, the hole injection layer should be introduced to modify the interface between anode and hole transport layer, and then help more holes enter hole transport layer. Similarly, electron transport layer acts as the same role. The cathode is typically adopting metal thin film. The emitting layer is the core functional layer of the whole organic light-emitting diode (OLED). The light emitting mechanism of organic light-emitting diode contains five steps:
Injection of carriers: Electrons from cathode and holes from anode will enter the organic functional layer between electrodes under the external electric field.
Transport of carriers: Injected electrons and holes will transport to electron transport layer and hole transport layer respectively.
Recombination of carriers: Electrons and holes will be bound up together by the Coulomb force, and formed excitons in the electric
Transport of excitons: Excitons start to transport under the electric field, and energy will be transmitted to light-emitting molecules. Electrons will be drivingto excitation state from the ground
Light-emitting process: Radiation decay and generated photons, then releasesluminous energy.
HSMAG provides thin-rolled nickel iron alloy and soft magnetic materials used for efficient energy storage and transfer, including Invar 36 for OLED applications. Nickel-iron alloys are characterized by relatively high permeability and low core losses. Their overall high saturation flux density means high performance energy storage and transfer over low to middle frequencies.
Key Markets & Applications
Motor and transformer devices
Delivery systems for natural gas, oil and other energy resources
OLED Manufacturing Process
Many aerospace and defense applications
Medical and pharmaceutical
Manufacturing Process of Organic Light-Emitting Diode (OLED)
Magnet in Organic Light-Emitting Diode (OLED) Deposition Apparatus
The evaporation process of light-emitting diode (OLED) needs to finish in the high vacuum cavities of deposition apparatus, and organic materials will be evaporated by the crucible. The glass substrates place on the special holder, then metal shadow masks will be placed under the substrates to dominate the patterns. OLED Deposition Apparatus Magnets
In order to ensure the substrates have ideal patterns, there is a magnet array should be placed on top of the substrate to attract the metal shadow masks, hence substrates can fit with masks closely. In fact, the magnetic field strength acting on different positions of the metal shadow mask is not same due to many factors. The coloring film of the pixel will be squeezed by the metal shadow mask because of higher magnetic force and thus lead to film discontinuous, eventually caused bad weather-ability. On the other hand, metal shadow mask cannot be fit closely with substrate, resulting in film disperse and reduction of valid film area. OLED Deposition Apparatus Magnets
The magnet array in deposition apparatus is similar like magnetic chuck, and the technical specification for this holder magnet includes dimension, appearance and consistency of magnetic performance. Magnets with dimension oversize will affect evenness of substrates, and consistency of magnetic performance will be evaluated by the deviation of central point gauss values. In order to enhance the testing efficiency and reliability, HSMAG team has introduced special automotive magnetization and testing equipment to meet the customer’s requirements in organic light-emitting diode (OLED) industry. OLED Deposition Apparatus Magnets