How Does Your TV Work? A brief introduction.. Two Amazing Things about the Brain 1.Connecting the dots Pixels and resolution 2.Connecting the frames 15.

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Presentation transcript:

How Does Your TV Work? A brief introduction.

Two Amazing Things about the Brain 1.Connecting the dots Pixels and resolution 2.Connecting the frames 15 frames per second

The Cathode Ray Tube  Anode and Cathode and Ray  Phosphor

Steering Coils

The Black-and-White TV Signal  Raster scan  Horizontal retrace  Vertical retrace  Interlacing  Progressive scanning

Thus, a “composite video signal” contains: 1.Intensity information 2.Horizontal retrace 3.Vertical retrace

Composite Video Signal

Adding Color  Changes from Black and White 3 electron beams Screen coating Shadow mask

Shadow Mask

Chrominance Signal/ Color Burst

Liquid Crystal Display (LCD)  Necessary physical facts: Light can be polarized. Liquid crystals can transmit and change polarized light. The structure of liquid crystals can be changed by electric current. There are transparent substances that can conduct electricity.

LCD Tech  On  Off

LCD Types  Backlit vs. Reflective  Common-plane-based  Passive-matrix  Active-matrix

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