Large-Screen Television Technology by forrests

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									Large-Screen
Television Technology

Everett Lai
Stanford University
Psych 221 Winter 2007
Motivation
 Interested in learning about current
  technologies behind TV’s
 Why Wikipedia article?
     Make  information accessible to the public
     Aid consumers in their TV purchase
     No more programming, please!
Display Technologies
 Liquid Crystal Display
 Plasma Display
 Projection TV
 Comparison: which one is for you?
LCD
LCD Developments
   Twisted Nematic
     Limited   viewing angle
   In-Plane Switching
     Betterviewing angle
     Slower response times
     Poor contrast
   Vertical Alignment
     Compromise     between the two, but reduced
      brightness
Plasma Display
Projection TV
 Front-projection
 Rear-projection
 Types of projectors:
     CRT
     LCD
     DLP
Comparison: LCD Pros/Cons
   Pros
     Slim profile
     Not susceptible to burn-in

   Cons
     At large sizes, more expensive than plasma
      displays at equivalent size
     Poor black level
Comparison: Plasma Pros/Cons
   Pros
     Slimprofile
     Can achieve true black level

   Cons
     Susceptibleto burn-in
     Phosphors lose luminance over time
Projection TV
   Pros
     Significantlycheaper than LCD and plasma
     Display sizes can be extremely large, up to
      hundreds of inches
   Cons
     Bulkier
            than flat-panel displays
     Lamp may need to be replaced
Example
   Samsung
       LN-S5797D: 57” LCD TV
            $7999
            4000:1 contrast ratio
            12.8 billion colors
            5.4” deep
       HP-S6373: 63” Plasma TV
            $6999
            10,000:1 contrast ratio
            549 billion colors
            3.5” deep
       HL-S7178W: 71” DLP Projection TV
            $4499
            10,000:1 contrast ratio
            20” deep

								
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