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Organic Light-Emitting Diode (OLED) technology

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  • RemyC
    From: http://www.wave-report.com/tutorials/oled.htm OLED Tutorial Organic Light-Emitting Diode (OLED) technology An OLED is an electronic device made by
    Message 1 of 1 , Jan 20, 2005
      From:
      http://www.wave-report.com/tutorials/oled.htm

      OLED Tutorial

      Organic Light-Emitting Diode (OLED) technology

      An OLED is an electronic device made by placing a series of organic thin
      films between two conductors. When electrical current is applied, a bright
      light is emitted. This process is called electrophosphorescence. Even with
      the layered system, these systems are very thin, usually less than 500 nm
      (0.5 thousandths of a millimeter).

      When used to produce displays, OLED technology produces self-luminous
      displays that do not require backlighting. These properties result in thin,
      very compact displays. The displays also have a wide viewing angle, up to
      160 degrees and require very little power, only 2-10 volts.

      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
      There are two types of OLED displays - passive and active. These
      distinctions, plus narration about the OLED 2001 conference and the market
      challenges that the technology will face can be read in WAVE 151 or as a
      separate article on the WAVE Report site.

      Coverage of the OLED 2002 conference was published in WAVE 0245.
      Comparing Technologies

      Liquid Crystal Displays (LCDs)

      For comparison, LCDs, which are widely used today, are nonorganic,
      nonemissive light devices, which means they do not produce any form of
      light. Instead they block/pass light reflected from an external light source
      or provided by a back lighting system. The back lighting system accounts for
      about half of the power requirements for LCDs, which is the reason for their
      increased power consumption (over OLED technologies).

      LCD production involves the same sort of layering technique used in OLED
      displays, with some modification. First there is the formation of electrodes
      on two glass substrates. Then the substrates are joined together and the
      liquid crystals are sealed within them. Backlights are used to spead light
      out by a thin light difuser. Finally the system is placed into a metal
      frame.

      Cathode Ray Tubes (CRTs)

      Displays made from CRTs are produced using electron tubes in which electrons
      are accelerated by high-voltage anodes, formed into a beam by focusing
      electrodes, and projected toward a phosphorescent screen that forms one face
      of the tube. The electrons beam leaves a bright spot wherever it strikes the
      phosphor screen.

      Pros and Cons

      CRTs

      Cost less and produce a display capable of more colors than LCD displays.
      CRTs also use emissive technology, meaing that they can provide their own
      light - this means you can view images from any angle.
      LCDs

      LCDs have gained popularity due to their smaller, lighter form factor and
      their lower power consumption.
      Many users report lower eyestrain and fatigue due to the fact that LCD
      displays have no flicker.
      LCDs emit fewer low-frequency electromagnetic emissions than CRTs.

      Additional sources of information*

      http://www/.oled-info.com
      http://www.wave-report.com/other-html-files/oled2002.htm
      http://arstechnica.com/news.ars/post/20050105-4500.html
      http://www.wave-report.com/2002%20Wave%20Issues/wave0245.htm
      http://www.kodak.com/US/en/corp/display/overview.jhtml
      http://www.sarnoff.com/products_services/displays/oleds.asp
      http://www.howstuffworks.com/lcd.htm

      Companies Developing OLED Displays

      http://www.cdtltd.co.uk
      http://www.universaldisplay.com
      http://www.olight.com
      http://w4.siemens.de/FuI/en/archiv/zeitschrift/heft2_99/artikel08/index.html
      http://www.kodak.com/US/en/corp/display/index.jhtml

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