14-05-2011, 11:27 AM
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ABSTRACT
OLED is a solid state device composed of thin films of organic molecules that create light with the application of electricity.OLEDs can provide brighter.crisper displays on electronic devices and use less power than conventional light emitting diodes(LEDs)used today.
Like an LED,an OLED is a solid state semiconductor device that is 100 to 500 nanometres thick or about 200 times smaller than a human hair.OLEDs can have either two layers or three layers of organic material. An OLED consist of the following parts:
• Subtrate
• Anode
• Organic layers
• Cathode
OLEDS emit light through a process called electrophosphorescene. Different types of OLEDs are
• Passive-matrix OLED
• Active-matrix OLED
• Transparent OLED
• Foldable OLED
• Top-emitting OLED
• White OLED Applications
Currently.OLEDs are used in small-sreen devices such as cell phones,PDAs and digital cameras.Research and development in the field of OLEDs is proceeding rapidly now and may lead to future applications in heads-up displays,automotive dash boards etc.
Can we just imagine of having a TV which can be rolled up? Would'nt you like to be able to read off the screen of your laptop in direct sunlight? Your mobile phone battery to last much, much longer? Or your next flat screen TVto be less expensive, much flatter, and even flexible? Well, now it is possible by an emerging technology based on the revolutionary discovery that, light emitting, fast switching diode could be made from polymers as well as semiconductors.
We know, ordinary LED emits light when electic current is passed through. Organic displays use a material with self luminous property that eliminates the need of a
back light. These result in a thin and compact display. While backlighting is a crucial component to improving brightness in LCDs, it also adds significant cost as well as requires extra power. With an organic display, your laptop might be less heavy to carry around, or your battery lasts much longer compared to a laptop equipped with a traditional LCD screen.
A screen based on PolyLEDs has obvious advantages: the screen is lightweight and flexible, so that it can be rolled up. With plastic chips you can ensure that the electronics driving the screen are integrated in the screen itself. One big advantage of plastic electronics is that there is virtually no restriction on size.
Research and development in the field of OLED is proceeding rapidly and may lead to future applications in heads-up displays, automotive dashboards, billboard-type displays, mobile phones, television screen, home and office lighting and flexible displays.
FEATURES OF OLED
Organic LED has several inherent properties that afford unique possibilities
• High brightness is achieved at low drive voltages/current densities
• Operating lifetime exceeding 10,000 hours
• Materials do not need to be crystalline, so easy to fabricate
• Possible to fabricate on glass and flexible substrates
• Self luminescent so no requirement of backlighting
• Higher brightness
• Low operating and turn-on voltage
Low cost of materials and substrates of OLEDs can provide desirable advantages over today's liquid crystal displays(LCDs),
• High contrast
• Low power consumption
• Wide operating temperature range
• Long operating lifetime
• A flexible, thin and lightweight
• Cost effective manufacturability
OLED displays have other advantages over LCDs as well:
• Increased brightness
• Faster response time for full motion video
Lighter weight Greater durability
Broader operating temperature ranges
Conventional semiconductor components have become smaller and smaller over the course of time. Silicon is the base material of all microelectronics and is eminently suited for this purpose.However, the making of larger components is difficult and therefore costly.
The silicon in semiconductor components has to be mono crystalline; it has to have a very pure crystal form without defects in the crystal structure. This is achieved by allowing melted silicon to crystallize under precisely controlled conditions. The larger the crystal, the more problematic this process is. Plastic does not have any of these problems, so that semiconducting plastics are paving way for larger semiconductor components.
[attachment=13919]
[attachment=13920]
ABSTRACT
OLED is a solid state device composed of thin films of organic molecules that create light with the application of electricity.OLEDs can provide brighter.crisper displays on electronic devices and use less power than conventional light emitting diodes(LEDs)used today.
Like an LED,an OLED is a solid state semiconductor device that is 100 to 500 nanometres thick or about 200 times smaller than a human hair.OLEDs can have either two layers or three layers of organic material. An OLED consist of the following parts:
• Subtrate
• Anode
• Organic layers
• Cathode
OLEDS emit light through a process called electrophosphorescene. Different types of OLEDs are
• Passive-matrix OLED
• Active-matrix OLED
• Transparent OLED
• Foldable OLED
• Top-emitting OLED
• White OLED Applications
Currently.OLEDs are used in small-sreen devices such as cell phones,PDAs and digital cameras.Research and development in the field of OLEDs is proceeding rapidly now and may lead to future applications in heads-up displays,automotive dash boards etc.
Can we just imagine of having a TV which can be rolled up? Would'nt you like to be able to read off the screen of your laptop in direct sunlight? Your mobile phone battery to last much, much longer? Or your next flat screen TVto be less expensive, much flatter, and even flexible? Well, now it is possible by an emerging technology based on the revolutionary discovery that, light emitting, fast switching diode could be made from polymers as well as semiconductors.
We know, ordinary LED emits light when electic current is passed through. Organic displays use a material with self luminous property that eliminates the need of a
back light. These result in a thin and compact display. While backlighting is a crucial component to improving brightness in LCDs, it also adds significant cost as well as requires extra power. With an organic display, your laptop might be less heavy to carry around, or your battery lasts much longer compared to a laptop equipped with a traditional LCD screen.
A screen based on PolyLEDs has obvious advantages: the screen is lightweight and flexible, so that it can be rolled up. With plastic chips you can ensure that the electronics driving the screen are integrated in the screen itself. One big advantage of plastic electronics is that there is virtually no restriction on size.
Research and development in the field of OLED is proceeding rapidly and may lead to future applications in heads-up displays, automotive dashboards, billboard-type displays, mobile phones, television screen, home and office lighting and flexible displays.
FEATURES OF OLED
Organic LED has several inherent properties that afford unique possibilities
• High brightness is achieved at low drive voltages/current densities
• Operating lifetime exceeding 10,000 hours
• Materials do not need to be crystalline, so easy to fabricate
• Possible to fabricate on glass and flexible substrates
• Self luminescent so no requirement of backlighting
• Higher brightness
• Low operating and turn-on voltage
Low cost of materials and substrates of OLEDs can provide desirable advantages over today's liquid crystal displays(LCDs),
• High contrast
• Low power consumption
• Wide operating temperature range
• Long operating lifetime
• A flexible, thin and lightweight
• Cost effective manufacturability
OLED displays have other advantages over LCDs as well:
• Increased brightness
• Faster response time for full motion video
Lighter weight Greater durability
Broader operating temperature ranges
Conventional semiconductor components have become smaller and smaller over the course of time. Silicon is the base material of all microelectronics and is eminently suited for this purpose.However, the making of larger components is difficult and therefore costly.
The silicon in semiconductor components has to be mono crystalline; it has to have a very pure crystal form without defects in the crystal structure. This is achieved by allowing melted silicon to crystallize under precisely controlled conditions. The larger the crystal, the more problematic this process is. Plastic does not have any of these problems, so that semiconducting plastics are paving way for larger semiconductor components.
