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How Television Works


Published by Random House Created by: Matt LaRose 2013


How Television Works: The Science Exhibit Š 2013 Random House Publications Univeristy of Missouri- Saint Louis Printed in the United States of America Design by: Matt LaRose All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy,recording, or any information storage or retrieval system,without permission in writing from the publisher.


Dedicated to My FiancĂŠ Brittany Rose Sharkey And My Daughter Brinly Eileen LaRose


Table of Contents Introduction

12

How Projection Television Works

15

How LED Television Works

25


WHAT IS TELEVISION? Television (TV) is a telecommunication medium for transmitting and receiving moving images that can be monochrome (black-and-white) or colored, with or without accompanying sound.

WHY IS IT IMPORTANT? Television is apart of almost every society in todays world. It has helped people learn about many different aspects of cultures around the world. It helps people to be more informed about the world today. It even entertains parents and children. The TV has brought families together for movie night and helped our children learn with educational programs.

12

The Past


The Future

TELEVISION TODAY As television has become an everyday part of our lives, it has changed to enhance the images that we see. In this exhibition, I will show and discuss how T.V.’s work from the very beginning. From Cathode-Ray Televisions (CRTV) to the Light Emitted Diode Televisions (LED) today. This is how televisions work.

13


Projection television is one of the earliest forms of television. It uses a Cathode Ray Tube that projects the images onto the television screen. In this section, I will describe the process of the projection television with illustrations along with a step-by-step process. First I will show the parts of the television, then I will explain each part it.


What makes a television work? 16

How does this create beams?


4

How does this amplify the beams? 17


SIGNALS are received via satelite, cable, or antenna.

18

COMPUTER CHIP These signals are sent to the televisions computer chip. The chip then breaks down the signal into three colors: Red, Blue, & Green.


* The beams are pulled through the anode because of their positive and negative charges.

CATHODE RAY Then a Cathode shoots red, green, and blue electrons to the an anode.

ANODE AMPLIFIER The three colored electron beams shoot through a anode , that amplifies the beams.

19


*(6) Side View

What makes the beams move up and down?

20

Why does this screen help the television process?


*(6) Front View

T.V. Screen

How are the images created on the television screen?

21


*(6) Side View

MAGNETS Magnets guide the beams onto a perverated screen called a Shadow Mask

22

SHADOW MASK The electron beams shoot thru the Shadow Mask, the mask helps the beams align perfectly on the screen. It is located directly behind the phosphorus screen.


*(6) Front View

T.V. Screen

Located directly bechind the phosphorus screen PHOSPHORUS GLASS SCREEN The electron beams hit the phosphorus painted screen which create the colors. The beams shoot across the screen from left to right.

*The first CRTV’s shot 20 lines per second, Later CRTV’s shot 500 lines per 1/2 second.

23


LED (Light Emitted Diode) Television is the latest and the future of television. The LED television uses LED to light layers of the television to create the images on the televsion screen. One pixel consists of seven layers. In this section I will illustrate and describe the step-by-step process of LED television.


*This is the process of 1 PIXEL out of 2,073,600 TOTAL PIXELS.

1,080 Vertical Pixels

1,902 Horizontal Pixels

Front View

26

Side View


Back

1

Front

2

3

4

5

6

7

One pixel is made up of 7 layers. Light Emitted Diode

Color Filter

First Polarising Lens Electrodes

Second Polarising Lens Glass Screen

Liquid Crystal

27


Front View

Side View

Back of TV

LIGHT EMITTINGDIODES Light Emitting Diodes are lit in responsive order to the RGB color that the signal is sending.

28

POLARISING FILM # 1 The LED light transfers through a glass filter that has polarising films.


TFT AND ELECTRODES Then the light goes through TFT and Electrodes that cause the Liquid Crystals to change their state. The liquid crystals are what allow the light to show the pixel on the glass screen.

LIQUID CRYSTALS The Liquid Crystals start straight at one glass pane and rotate 90 degrees to the other glass pane. If the path of the Liquid Crystals is disrupted from the electrodes, then the pixel will not be lit.

29


Side View Front View COLOR FILTER After the light goes through thet Liquid Crystals, the light is then transferred through color filters (RGB).

30

POLARISING FILTER #2 If that pixel of the image is supposed to be shown, then the light will be allowed to be shown through the other side of the second polarising filter.


Front of TV

GLASS SCREEN Once the light goes through, the image goes through the glass screen of the television.

PIXEL The final pixel can be Red, Green, or Blue. With thousands of pixels next to each other, they create the image you see on your screen.

31


COLOPHON This catalogue was created by Matt LaRose Spring 2013 at the University of Missouri- Saint Louis This book was made with Adobe Illustrator and InDesign CS6 Š Random House Publications



How Television Works