12/9/2019 12:03:00 AM   By  Admin  in

Light curtains come under optoelectronic devices that are utilized to defend personnel in the proximity of moving machinery that can cause harm like winders, palletizers, and winders. Light curtains can be utilized as an alternative to traditional machine guarding and other mechanical barriers. By decreasing the requirement for physical barriers and guards, these safety light curtains can uplift the practicality of the hardware they are guarding. It should also be noted that by the use of light curtains the efficiency and the operability of the machinery can be improved. 

 

Description

Light curtains can be categorized under those gadgets that are known as Presence Detection devices. Other popular Presence Detection devices include laser scanners and pressure-sensitive safety mats. Most significant uses of safety relays are in industries that work upon robotic cell setup.

Light curtains come with a transmitter and a receiver. The transmitter makes a projection of several parallel light beams in an array to the receiver. The receiver contains photoelectric cells that can easily absorb these array of light beams. Whenever an object is seen breaking one or more beams, the guarded equipment is notified with a signal to stop.

The beam of light produced from the transmitter is sequenced, in a steady progression, and is pulsed at a particular recurrence. The receiver is optimized to accept only a specific frequency and pulse from its respective transmitter. This helps in rejecting infrared light that is spurious and in this way improves their reasonableness as segments inside a security framework.

Generally, it is seen that a safety relay is connected with these light curtains that help in nullifying motive power from the hazard. Safety relays can be given muting usefulness which empowers the brief disabling of the security capacity to enable articles to go through the light curtains without stumbling the safety relay. This is especially valuable for hardware which has a few Semi-Automatic processes.

 

Applications of Safety Light Curtains: Point of Operation Vs Perimeter

Industrial facilities and manufacturers utilize light curtains for safety in 2 general situations i.e. Point of Operation & Perimeter. Let's discuss them in brief.

  • Point of Operation

In this case, the individual positions the light curtains at the point of material handling, let's say under a hydraulic press. It is done with an only intention to make sure that nobody enters the danger area while the machine is being operated.

 

  • Perimeter

Conversely, perimeter guards allude to depicting an entire working space or room, let's say for robotic arms. It makes sure that no object or person comes in the boundary of the movement of the machine.

 

Advantages of Safety Light Curtain

Light curtains provide several advantages over physical barriers, such as.

  1. It's quite easy to access machine guarded by safety light curtain rather by a physical barrier.
  2. To perform semi-automatic processes and routine maintenance can be done efficiently.

Hope you liked the above article on safety light curtains. Brands that manufacture them are Panasonic, Omron, and Honeywell. Make sure to follow them using the links as provided.

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12/9/2019 12:00:00 AM   By  Admin  in

A photo eye or a photoelectric sensor is a gadget that helps in discovering the present and absence of the object as well as its distance by utilizing a light transmitter, generally infrared, with a photoelectric receiver. They are most commonly used in manufacturing in the industry.

 

Types

There are 3 types of Photoelectric Sensors. Let’s have a look at them.

A photoelectric sensor that is self-contained comes with the optics in addition to the electronics. It needs only a source of energy. The sensor does its own output switching, amplification, modulation, and demodulation. Some sensors that are self-contained also supports an option for counters or built-in control timers. Because of the advancement in the tech world, today, self-contained photoelectric sensors are reduced in sizes.

Remote photoelectric sensors that are utilized in remote sensing comes with only the optical part. The hardware for amplification, output switching and power input are situated elsewhere, generally in a control panel. Thus allowing the sensor to get very small. In addition to that, the controls of the sensor are increasingly available, since they might be greater.

When space is one of the constraints or the environment is excessively hostile for using remote sensors, we take fiber optics into consideration. Fiber optics are latent mechanical detecting segments. They can be utilized either with self-contained sensors or with remote ones. They have neither any moving part nor comes with any electrical circuitry. It can pipe light safely into and out of any hostile environment.

 

Modes

There are 3 different modes of photoelectric sensors. They are as follows:

  • Opposed (through-beam)

Pros:

  1. The sensing range is the longest.
  2. It is mostly accurate.
  3. It is very much reliable

Cons:

  1. It is important that it should get installed at 2 points in the system i.e. receiver as well as an emitter.
  2. It is a bit costly as it required a separate receiver and emitter.

 

  • Retro-Reflective

Pros:

  1. Its sensing range is much better than that of diffuse.
  2. It is slightly less accurate than through beam.
  3. It is very much reliable.

Cons:

  1. Its sensing range is lesser than through beam.
  2. It is a bit more costly than diffuse
  3. It is important that it should get installed at 2 points in the system i.e. reflector as well as the sensor.

 

  • Diffuse (Proximity Sensing)

Pros:

  1. It needs to be installed only at one point.
  2. It is much cheaper than reflective as well as through-beam.

Cons:

  1. It requires more setup time.
  2. Accuracy level is lesser than retro-reflective or through-beam.

This was all we have regarding photoelectric sensors. Hope that you enjoyed reading through the article. Brands that manufacture photoelectric sensors are Omron, Panasonic, and Sick. Make sure to follow them using the links as provided.

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12/8/2019 11:54:00 PM   By  Admin  in

DIN rails are the long metal strips that structure the center piece of a worldwide industry standard equipment rail-mounting system. DIN rails have found its main use in attaching industrial as well as electrical control products securely, like terminal blocks, actuators, circuit breakers, solenoids, etc. inside a rack housing frame or cabinet.

In the above context, the word DIN stands for Deutsche Institut für Normung which is a German statement. When translated to English it says ‘German Institute of Standards’. The rack mounting system that we see today supporting several industrial settings was devised earlier in the late 1920s by the German. By 1950 it was completely developed and adopted, first by the neighboring countries in Europe and then across the globe.

 

Types

The DIN rail comes in 3 different types.

  • Top Hat Section, Type Ω or Type O having cross-section that is in shape of a hat.

 

Top Hat Rail IEC/EN 60715

                                                                                   

This rail is 35 mm wide and is used to mount relays, motor controllers, circuit breakers, programmable logic controllers, etc. It is also known as the TS35 DIN rail in the USA.

 

  • C section

 

C Section rail AS 2756.1997 (C30)

                                                                          

The most popular used C section rails are C50, C40, C30, and C20. The number that is present in the suffix of 'C' specifies the net vertical height of the rail.

 

  • G section

                                                         

The G rail is utilized to hold high power and heavier components. It is mounted with the deeper side at the base, and hardware is snared over the lip, at that point pivoted until it clips into the shallower side.

 

DIN Rail Power Supply

This central unit for the distribution of power takes in AC line voltage and transforms it into DC voltage and is situated in an electrical cabinet placed on a DIN rail. DIN rail power supplies are most popularly utilized in electrical cabinets as well as control panels to support industry standard 48V, 24V or 12V DC. They should be guaranteed to UL60950 general purpose power supply and UL standard 508 performance and safety standards for automation in factories.

These days the market is seeing a huge drop in the prices of DIN rail modules and the reason behind this is due to intense competition and "economy of scale". Thus, they are gaining their popularity in security technology, smart home applications, and building automation.

 

 

Things to consider while choosing a DIN Rail Power Supply

If you require a perfect DIN rail power supply for your cabinet, you need to take care of a certain number of things to find the desired one.

  • Input/Output – For supporting global compatibility, it is recommended to go for a wide AC input voltage range. It should accept a wide frequency range as well as cover most line voltage.

 

  • Connection and Wiring – Wires connected to the power supply unit should have shorted cable length and largest cross-section possible.

 

  • Low Maintenance Cost and Reliability – For professional use we recommend you to go with a costly one as you can't afford any failure but if it's required in a non-professional field where failure is not a big issue then you can opt for lower-cost equipment.

 

This was all we have regarding DIN Rail Power Supply. Brands that manufacture them are Omron, Phoenix Contact and Mean Well. Make sure to visit their website through the links as provided.

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12/8/2019 11:48:00 PM   By  Admin  in

A counter or a tachometer is an instrument that helps in measuring the speed of rotation of a disk or shaft, like that present in a motor. This device generally shows the RPM (Revolution Per Minute) on a calibrated analogue dial. The digital displays are getting much popular these days.

The word speedometer as well as tachometer have the same meaning i.e. a device used in measuring the speed. But by convention in the world of automobiles, one is used for representing the speed of the vehicle and the other one represents that of the engine.

The 1st made tachometer depended on estimating the Centrifugal force. Its operation was similar to the Centrifugal governor. The person who invented this device was Dietrich Uhlhorn, a German Engineer, in 1817. From 1840, this device is utilized to calculate the engine’s speed.

Revolution counters or tachometers present in aircraft, cars and other automobiles show the rotation rate of the crankshaft of an engine. It has also got a marking that points to the range that is safe for the rotation speed. This helps the driver in choosing the right gear and throttle setting. Overheating and inadequate lubrication is the major consequence of their prolonged use at high speed.

In analogue tachometers, if the speed rises more than the safe operating speed then it is displayed by a zone of the gauge with a red mark. Thus, offering to ascend to the declaration of “redlining” an engine - firing it up to the most extreme safe point of confinement. The modern cars used these days also come with this red mark in their tachometer. However, they are of no use as their engines come with a limiter which automatically limits its speed to prevent the car from any damage. Diesel engines with conventional mechanical injector frameworks come with an integral speed limiter which stops the engine to speed up. Thus the tachometer used in them lacks redline.

The trucks and tractors come with a tachometer that has a green arc in them. This green arc lets the driver know the speed at which the engine is producing the maximum torque. Some tractors also come with a PTO (Power Take-Off). The tachometers in them help in letting the driver accustomed to the speed of the engine needed to rotate the PTO at the standardized rate. Tractors having more than one ‘road gear’ often have tachometers with multiple speed scale. The green arc is said above is also present in the tachometer of an aircraft to show the cruising speed range of their engine.

 

Traffic Engineering

From the above discussion, it is clear that tachometers help in estimating the volume (flow) and speed of the engine. A vehicle is fitted with a sensor and conducts "tact runs" that keep a record of the traffic information. The information gathered here is a complement to loop detector data. To get measurably huge outcomes needs a large number of runs. Nonetheless, due to the cost and spacing tach runs is a popular practice.

This was all we had about counters and tachometers. Brands that manufacture them are Panasonic, Omron, and Crouzet. Make sure to check them out through the links as provided.

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11/30/2019 9:09:00 AM   By  Admin  in

A varistor is an electrical device having an electrical resistance that differs with the potential applied to it. A varistor is popularly known as Voltage Dependent Resistor (VDR). It possesses a non-ohmic and non-linear Current-Voltage characteristic which is equivalent to a diode. Unlike the diode, it has a similar characteristic for the flow of both directions of current. Customarily, varistors were made by joining 2 rectifiers i.e. either the germanium-oxide or the copper-oxide rectifier in a configuration that is anti-parallel. The electrical resistance of the varistor is high at low voltage but as the voltage increases the resistance decreases. The varistors that are used presently are fundamentally dependent on sintered ceramic metal-oxide materials. On a microscopic scale, it shows directional behavior. This category is popularly known as MOV or Metal Oxide Varistor.

Varistor serves as a compensation and a control element in the electrical circuit either to defend against excess voltage or to offer optimal operating conditions. When utilized as defending devices, they shunt the current established by the exorbitant voltage away from touchy segments when activated.

 

Composition

As said earlier, the newest form of varistor that is used is the Metal Oxide Varistor. This kind of varistor is constituted by a ceramic mass of zinc oxide grains with metal oxides (like a small quantity of cobalt, bismuth, manganese oxides) placed in the middle of 2 metal plates, which comprise the device’s electrodes. A diode junction is formed between each grain and its neighbor.

When the electrodes are given a small potential difference then only a small amount of current flows through the diode junction which is a result of reverse leakage. On the other hand when a large voltage is applied on the electrodes a large amount of current flows, as the diode junction separates itself because of the combination of electron tunneling and thermionic emission. The consequence of the above-said behavior is a non-linear Current-Voltage characteristic where the MOV possesses a low resistance at high voltage and high resistance at low voltage.

 

Voltage Rating

MOVs are categorized by the range of voltage that they can endure without damage. The other parameter is the varistor’s breakdown voltage, maximum current, energy rating in joules, response time and operating voltage.

The rating of energy is regularly characterized utilizing institutionalized transients like 10/1000 microseconds or 8/20 microseconds. Here 10 microseconds are the front time of the transient and 1000 microseconds is the time of half value.

 

Capacitance

The range of capacitance for varistors which are consumer-sized i.e. 7 to 20mm in diameter is from 100pF to 2,500pF. Varistors that are used in micro electric protection have low capacitance like around 1pF. You can get this kind in cellular phone. These varistors having low capacitance cannot withstand the flow of a large amount of current as the PCB mount size is compact.

 

Response time

The response time of the MOV isn't institutionalized.

Hope you liked the article on Varistors. Brands that make them are Littelfuse, EPCOS, Panasonic. You can refer to them using the links as provided. Thank you for reading.

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11/30/2019 9:04:00 AM   By  Admin  in

TRIAC stands for Triode for Alternating Current. It is a genericized trademark for an electrical device that has 3 terminals and when triggered conducts electrical current in both directions. Its conventional name is bilateral triode thyristor or bidirectional triode thyristor. A thyristor is comparable to a relay where a small voltage induced current can control a lot bigger current and voltage.

Thyristors can be said to be the superset of TRIACs. TRIACs are also relatable to SCRs (Silicon Controlled Rectifiers). TRIACs and SCRs can be distinguished in one characteristic feature i.e. the first one is bidirectional, the flow of current is in both the direction but the later one allows the flow of current in only one direction. Generally, the TRIACs get initiated by the consequence of a positive or a negative potential to the gate but the SCR needs only a positive potential. Once activated, SCRs and TRIACs keep on conducting, regardless of whether the current in the gate ceases, until the principle current dips under a specific level called the holding current.

The GTOs or Gate Turn-Off Thyristors are the same as TRIACs but when the signal in the gate ceases, it provides much more control by turning OFF.

The bidirectional feature of this equipment makes it a good switch for AC or Alternating Current. A trigger, when applied in the main circuit at AC's controlled phase angle, permits control of the average current streaming into a load. This feature is popularly used for managing the speed of dimming lamps, electric heaters, and universal motor.

 

Factors that affect the working of TRIAC

TRIACS, unlike SCRs, needs appropriate enhancement for its legitimate working. There are some inherent drawbacks like TRIACs Backlash effect, Rate effect, etc. Thus designing it requires proper case.

  • Backlash Effect

This effect is one of the most acute Control Hysteresis that grows in the speed control or the lamp control circuits with the help of a Potentiometer for controlling the Gate current. The glowing brightness of the lamp gets a minimum when the potentiometer's resistance increases to the maximum. The lamp never gets ON when the pot is turned back until and unless the resistance of the pot drops to its lowest value. The main reason behind this is the discharging of the TRIAC's capacitor. The triggering pulse is provided to the gate by a Diac. Triac releases through the Diac, generating the Backlash effect.

 

  • Rate Effect

The Rate effect generally takes place due to high inrush current when overwhelming inductive loads switch on and also because of a momentary variation in frequency, voltage or current in the mains.

 

  • Effect of RFI

RFI or the Radio Frequency Interference seriously influences the working of Triacs. Depending on the resistance and the supply voltage of the load, the load current is seen to sharply increase from 0 to a high value whenever the TRIAC switches on the load. This forms pulses of RFI.

This was all regarding TRIACs. Brands that manufacture it are Littelfuse, STMicroelectronics, and NXP. We hope that you liked the article. If you want to refer to the brands then just follow the links as given.

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11/30/2019 8:43:00 AM   By  Admin  in

A Semiconductor Controlled Rectifier or an SCR or a Silicon Controlled Rectifier is a 4 layered solid-state current controlling electrical equipment. This technique of 4 P-N-P-N switchings was established in 1956 by Tanenbaum, Holonyak, and Goldey. In January 1958, Dr. Ian M. Mackintosh of Bell Laboratories presented the practical explanation of SCR. The name Silicon Controlled Rectifier is the trade name for General Electric for a kind of thyristor. The Silicon Controlled Rectifier was made by a group of power engineers which was led by Gordon Hall, furthermore, marketed by Frank W. "Bill" Gutzwiller in 1957.

A few sources characterize thyristors and Silicon Controlled Rectifiers as almost the same thing but some say that they are an appropriate subset of the arrangement of thyristors and it comes with at least 4 layers of alternating P and N-type materials. Bill Gutzwiller says that the word “Controlled Rectifier” and “SCR” were used earlier and the word “thyristor” came into existence when the equipment started to get spread internationally.

SCRs are devices that can make the current flow in only one direction (i.e. unidirectional). It is completely different from TRIACs (Triode for Alternating Current) where current can flow in both the directions (i.e. bidirectional). SCRs can be activated regularly just by the flow of current into the gate rather than TRIACs, which can be activated ordinarily by either a negative or a positive current applied to its gate electrode.

 

Modes of Operation

Depending on the biasing given to an SCR, it can be classified into 3 modes.

Forward Blocking Mode

In this category, the cathode is provided with a negative potential and the anode gets a positive potential and the gate is kept disconnected i.e. at Zero potential.

 

                                                                                                  

As you can see here, the junction J2 is reverse biased and J1 and J3 are biased forward. Thus, permitting the flow of only small amount of leakage current from another to the cathode. An avalanche breakdown is initiated when the applied potential gets to the break-over value for J2. J2 starts to conduct at this break over but below that the current used to face high resistance from it and the SCR is known to be in off state.

Forward Conduction Mode

An SCR can be converted to Conduction mode from Blocking mode in 2 different ways.

  • At the gate offer a positive pulse.
  • Uplifting the potential difference between the cathode and the anode over the break-over voltage. As soon as the SCR starts conducting, to maintain it in the ON state no gate voltage is needed.

Reverse Blocking Mode

The SCR is said to be in reverse blocking mode when a positive potential is provided to the cathode and a negative potential at the anode. Thus, J2 is biased forward and J1 and J3 are reverse-biased. The equipment acts as 2 reverse-biased diodes associated in series. A small amount of leakage current flows through it.

So this was all we have about SCRs. Hope you enjoyed reading it. Brands that make SCRs are Littelfuse, STMicroelectronics, and NTE. Refer to them through the links as provided.

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11/30/2019 8:35:00 AM   By  Admin  in

A thermal cutoff is a safety device for electrical equipment. It ceases the flow of current in a device when heated to a specific temperature. These devices can be reset either automatically or even manually.

 

Thermal fuse

Thermal fuse is a cutoff that utilizes a fusible link (applicable for only one time). The thermal fuse is not like the thermal switch that gets reset automatically whenever there are temperature drops. On the contrary, it's like an electrical fuse – a one-time-use device that cannot reset itself and needs to be replaced when it is triggered. Thermal fuse is generally used in those situations where overheating is a rare occurrence.

One component is a little meltable pellet that holds down a spring. The spring gets released when the pellet melts completely. As a consequence of this, the circuit breaks up. The NEC Sefuse SF series, Tamura LE series, Hosho Elmwood D series and Microtemp G4A series may manufacture the alloy pellets containing silver, copper, and beryllium to melt at a precise temperature.

Thermal fuses have found its use in heating electrical appliances like hairdryers and coffeemakers. It serves as a safety equipment to cease the flow of current to the device in case of any malfunction that would result in the temperature to ascend to risky levels, potentially lighting a fire. Thermal fuses react only in case of excessive temperature and not during the flow of excess current. This is one of the main differences of the device with a normal electrical fuse. 

 

Thermal Switch

A thermal switch popularly known as a Thermal Cutout (TCO) or thermal reset is an electrical equipment that opens with a "plink" sound at a higher temperature and closes itself automatically when there is a drop in temperature. The thermal switch is a bimetallic strip that is often encased in a cylindrical glass bulb to shield it from short circuits or dust particles. Another basic configuration utilizes a bimetallic shallow dome-shaped top which "clicks" to an inside out inverted cap when warmed, for example, the "Klixon" brand of thermal cutouts.

The thermal switch can be reused. Thus it is used in temporary places that are user-correctable. Thermal switches are used as thermostats in some cooling and heating system. It is also used in power supplies in case of any malfunction (overload). Another category of thermal switch is the Positive Temperature Coefficient thermistor (PTC). These kinds of thermistors have a “switch” temperature. At this temperature, the resistance rises rapidly and limits the current in the circuit. It is used in motor overheat protection.

Thermal switch is also used in some luminaire, particularly with downlight, where unnecessary heating is well on the way to happen. This might sometime result in "cycling". It is the process where the lights turn on and off after every few minutes. Glimmering radiant Christmas lights take advantage of this impact.

This was all we have about Thermal Cutoffs. Brands that manufacture this equipment are TE Connectivity, Littelfuse and Bourns. Make sure to refer them using the links as provided. Hope you liked the article and Thank you for reading.

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11/30/2019 8:31:00 AM   By  Admin  in

A resettable fuse is a PPTC (Polymeric Positive Temperature Coefficient) device that is a piece of passive electronic equipment utilized in defending against overcurrent faults in electrical circuits. It is also popularly known as polyswitch or a multifuse or a polyfuse. In certain situations, it is noted that this device is much similar to PTC thermistors but instead of charge carrier effects, they are operated on mechanical changes in semiconductors. A PPTC device consists of a voltage rating and a current rating. This electronic device was invented by Gerald Pearson in 1939 at Bell Labs. It was described in US patent #2,258,958.

A PPTC device is manufactured using a crystalline organic polymer matrix which is non-conductive in nature. To make it conductive it is added up with black carbon particle. Several conductive chains of carbons are formed between the crystals when it is cooled. Now as it is good at conducting electricity, the current will pass easily. Passage of a large amount of current through the device will make it heated up. The polymer will expand due to the heating up of the device. As a result, the polymer will change to the amorphous state from its crystalline form. Now as the heat is causing the expansion in the polymer, the carbon particles will start to get separated and the conductive pathways will start to break. As a consequence of this, the device will heat at a much faster rate, expand more and the resistance will be increased. Due to this increase in the resistance the circuital current will decrease. The device still consists of a small amount of current (leakage current) flowing through it which is enough to keep the temperature at a level such that the equipment is at a high resistance state. The range of leakage current is from a few hundred mA at lower voltages to less than a hundred mA at rated voltage. It can be said that latching functionality is one of the characteristic features of the device. 

As soon as the power is removed from the device, the heating caused by the leakage current will cease and the resettable fuse (PPTC) will start to cool down. With the cooling of the device, the original crystalline structure is regained and it gets back to its low resistance state that can hold current. The cooling process of the device generally takes a couple of seconds. 

Resettable fuses are most commonly used in computer power supplies (generally of PC 97 standard), nuclear applications as well as aerospace applications. This device is also used in protecting audio loudspeakers (tweeters). A circuit designed with a PPTC device connected in parallel to the light bulb or a resistor helps in limiting the current through the tweeter to a safer limit. Thus the tweeter will not get damaged if the amplifier is conveying more power that is endurable by it.

This was all we had about Resettable fuses. Brands that make them are TE Connectivity, Littelfuse and Bourns. Make sure to follow them by the links as provided. Thank you for reading up the blog.

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11/30/2019 8:28:00 AM   By  Admin  in

Unlike the CRT (Cathode Ray Tube), the LCDs (Liquid Crystal Display) are not able to produce light of its own. Thus it uses a backlight that provides illumination to it. Backlight provides illumination to the LCD from the back and side of the display panel. Backlight is generally used in small displays such as smartphones, LCD televisions, computer displays, wristwatches, etc.

For color screens, the LED backlighting comes under 2 categories. The first one is the RGB LED backlights and the second one is the white LED backlights.

  • RGB LED backlights – The RGB LEDs are made up of red, blue and green LED which can be made to generate several color temperatures of white. RGB LED backlights are generally found in high display devices like HP EliteBook and HP DreamColor LP2480zx monitor. It has also found its use in Dell’s Studio series laptops. RGB LEDs are enabled to provide color gamut to screens. The 3 LED backlights can form a color spectrum that intently coordinates the color filters in the LCD pixels themselves. Using this technique, the filter passband is narrowed, as a result of which a narrow band of spectrum is allowed by each color component through the LCD. As there is a blockage of less amount of light, the efficiency of light is increased. In addition to that, the actual green, blue and red points can be displaced farther out such that more vivid colors can be formed by the display.

 

  • White LED backlights – White LEDs are used frequently in the manufacture of desktop and notebook screens. A white LED is actually a blue LED with yellow phosphor to bring about the discharge of white light.

 

The LED backlights face several challenges as well. With the increase in the age of an LED, it's very hard to attain uniformity. As 3 different light sources are used i.e. red, green and blue, it means that with aging LED the white point of the display can get displaced at varied rates.  At higher temperature white LEDs faces blue shifts (from 3141K to 3222K for 10 degree Celsius to 80 degree Celsius). Power efficiency may also be kept as a point to note for LEDs.

To defend against the above-discussed challenges in white and RGB LED backlights, NDF Special Light Products has developed an LED technology known as 'advanced remote phosphor'. It uses blue pump LEDs in addition to a sheet having the printing of phosphorous luminescent materials. These are used in those LED applications that require a long life like Air Traffic Control displays, Cockpit display and medical displays.  The principle for this technology is similar to Quantum dots.

With time it is seen that notebook computer is using LED backlights at an immense rate. Since 2005 Sony is taking the help of LED backlights for its VAIO notebook. Asus, Apple, and Dell also made their own LED backlight notebooks by 2007. Today all screens of Apple use LED backlight, be it computer, laptops, etc.

Hope you liked the article on LED backlights. Brands that manufacture them are ELECTRONIC ASSEMBLY, Lumex and Newhaven Display. Make sure to follow them by the links as provided.

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