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liquid crystal display
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English Dictionary: liquid crystal display by the DICT Development Group
2 results for liquid crystal display
From WordNet (r) 3.0 (2006) [wn]:
liquid crystal display
  1. a digital display that uses liquid crystal cells that change reflectivity in an applied electric field; used for portable computer displays and watches etc.
    Synonym(s): liquid crystal display, LCD
From The Free On-line Dictionary of Computing (15Feb98) [foldoc]:
   liquid crystal display
      (LCD) An electro-optical device used to display
      digits, characters or images, commonly used in digital
      watches, calculators, and portable computers.
      The heart of the liquid crystal display is a piece of {liquid
      crystal} material placed between a pair of transparent
      {electrodes}.   The liquid crystal changes the phase of the
      light passing through it and this phase change can be
      controlled by the {voltage} applied between the electrodes.
      If such a unit is placed between a pair of {plane polariser}
      plates then light can pass through it only if the correct
      voltage is applied.   Liquid crystal displays are formed by
      integrating a number of such cells, or more usually, by using
      a single liquid crystal plate and a pattern of electrodes.
      The simplest kind of liquid crystal displays, those used in
      digital watches and calculators, contain a common electrode
      plane covering one side and a pattern of electrodes on the
      other.   These electrodes can be individually controlled to
      produce the appropriate display.   Computer displays, however,
      require far too many pixels (typically between 50,000 and
      several millions) to make this scheme, in particular its
      wiring, feasible.   The electrodes are therefore replaced by a
      number of row electrodes on one side and column electrodes on
      the other.   By applying voltage to one row and several columns
      the {pixels} at the intersections are set.
      The pixels being set one row after the other, in {passive
      matrix} displays the number of rows is limited by the ratio of
      the setting and fading times.   In the setup described above
      (known as "{twisted nematic}") the number of rows is limited
      to about 20.   Using an alternative "{supertwisted nematic}"
      setup {VGA} quality displays (480 rows) can be easily built.
      As of 1995 most {notebook computers} used this technique.
      Fading can be slowed by putting an active element, such as a
      {transistor}, on the top of each pixel.   This "remembers" the
      setting of that pixel.   These {active matrix} displays are of
      much better quality (as good as {CRTs}) but are much more
      expensive than the passive matrix displays.
      LCDs are slimmer, lighter and consume less power than the
      previous dominant display type, the {cathode ray tube}, hence
      their importance for {portable computers}.
No guarantee of accuracy or completeness!
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