More TV and Video

Overview
What?!?! How can this be? More TV and Video to find your way through. Will there ever be an end to the evolution of TV and Video?

CRT - (Cathode-Ray-Tube)
Composed Of:
 * 3 Beams (Red, Blue, and Green) accelerated and focus by an anode
 * Shadow Mask: thin sheet of metal in front of screen
 * Deflection Yoke: Magnetic coils that generate fields to which control the movement of beams across the tube.

LCD - (Liquid Crystal Display)
Composed Of: How It Works:
 * 2 Polarizing Filtered Layers
 * Liquid Crystals

Light passes through the first filter leaving only horiztonal lines entering a layer of liquid crystal cells. There is a cell for each color that makes up a pixel. An electrical charge is applied to some of the cells and no charge to others. By addinge a charge the molecules begin to twist. The light then passes through the second filter that only allows light waves traveling vertically to pass through.

LED - Light Emitting Diode
Advantages of LEDs:
 * Can handle darker tones than LCDs
 * Can achieve deeper blacks and emit brighter images than LCDs
 * Can achieve better contrast ratios
 * Slimmer than LCDs
 * Better Viewing angles
 * Last a long time
 * Very efficient

Plasma Screens
Adavantages of Plasma Televisions Disadvantages of Plasma Televisions
 * Plasma has brighter images
 * Plasma can be seen from a wide angle - 160 degrees
 * Can easily be larger than LCDs
 * Expensive
 * Burn-in images

DLP - Digital Light Processing
What is Digital Light Processing? DLP created an image using small mirrors on a small chip called a Digital Micromirror Device (DMD). Each mirror represents 1 pixel or more of the image. The mirrors can repositioned rapidly to emit certain amounts of light.

How Does DLP Work? 

OLED - (Organic Light Emitting Diode)
What's In an OLED? Types of OLEDs - Heads up display - Displays - Mobile devices
 * Substrate (clear plastic, glass foil) - supports the OLED
 * Anode - removes electrons when current is flowing through device
 * Organic Layers - Made of polymers or organic molecules
 * Conducting Layer - Made of organic plastic molecules that trasnport "holes from the anode
 * Emissive Layer - Made of organic plastic molecules that transport electrons from the cathode. Light is made here.
 * Cathode - Injects electrons when current is flowing through device.
 * Transparent
 * Top-emitting
 * Foldable

- Clothes - Lighting
 * White

OLED's can be used on almost ANYTHING!!!

OLED Pros and Cons

Advantages  Disadvantages 
 * Thinner lighter and more flexible than crystals
 * Brighter
 * Consume less power
 * Larger fields of view
 * Liftime
 * Manufacturing
 * Very bad with Water

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