#liquid_crystal_display__LCD  a digital display that uses liquid crystal cells that change reflectivity in an applied electric field; used for portable computer displays and watches etc.
  supertype:  #digital_display__digitaldisplay__alphanumeric_display  a display that gives the information in the form of characters (numbers or letters)
  subtype:  #active_matrix_screen  a type of LCD screen used for some portable computers; there is a separate circuit for each pixel
  subtype:  #passive_matrix_display  a type of LCD screen used for some portable computers; parallel wires run both vertically and horizontally and pixels are turned on when the wires intersecting at that pixel are both energized; "passive matrix displays are generally inferior to active matrix displays"
     subtype:  #dual_scan_display  a type of passive matrix display in which the top and bottom half of the screen are refreshed simultaneously

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