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* Parallel - Parallel displays connect to a microcontroller via a parallel interface( the bitwidth varies from 8bits to 32bits ).  Displays can have a much faster update rate then serial since they allow arbitrary graphs to be display.  The displays are typically much cheaper then serial display starting as low as $20.
 
* Parallel - Parallel displays connect to a microcontroller via a parallel interface( the bitwidth varies from 8bits to 32bits ).  Displays can have a much faster update rate then serial since they allow arbitrary graphs to be display.  The displays are typically much cheaper then serial display starting as low as $20.
 
* Bare glass - These displays do not have built-in controller and are essentially LCD glass with contacts for every segment and backplane. You need a special driver (e.g. PCF8562) to use these or a microcontroller with built-in LCD controller (e.g. ATMega169), however, displays with only one backplane could be driven directly from the microcontroller I/O pins or bank of shift registers which is more convenient (atmel has an appnote on this method). The advantage of this display type is its price - it is not much different from 3-4 digit LED matrices, and it surely outperforms LEDs in terms of power-efficiency.
 
  
 
Finding LCD displays is not easy since huge distributors such as Digikey have a limited selection.  
 
Finding LCD displays is not easy since huge distributors such as Digikey have a limited selection.  

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