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How Does Your TV Work?

Explore the workings of modern televisions, from the historic Cathode Ray Tube to the vibrant colors of Liquid Crystal Displays. Discover how pixels, resolution, and composite video signals contribute to the TV viewing experience. Learn the intricate details behind the transition from black-and-white to color broadcasting. Unveil the magic of liquid crystals and their role in LCD technology. Dive into the world of TV engineering as you connect the dots between different display technologies.

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How Does Your TV Work?

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  1. How Does Your TV Work? A brief introduction.

  2. Two Amazing Thingsabout the Brain • Connecting the dots • Pixels and resolution • Connecting the frames • 15 frames per second

  3. The Cathode Ray Tube • Anode and Cathode and Ray • Phosphor

  4. Steering Coils

  5. Steering Coils

  6. The Black-and-WhiteTV Signal • Raster scan • Horizontal retrace • Vertical retrace • Interlacing • Progressive scanning

  7. Thus, a “composite video signal” contains: • Intensity information • Horizontal retrace • Vertical retrace

  8. Composite Video Signal

  9. Adding Color • Changes from Black and White • 3 electron beams • Screen coating • Shadow mask

  10. Shadow Mask

  11. Chrominance Signal/Color Burst

  12. 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.

  13. LCD Tech • On • Off

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

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