Unit 7 Display screens and ergonomics

Your computer screen

In pairs, discuss these questions.

1 What type of display do you have: a cathode ray tube or an LCD flat screen?

2 What size is the screen?

3 How can you change the picture using the controls?

An Apple Mac flat screen monitor

4 Can you watch TV on your PC monitor?

How screen displays work

Complete these definitions with words from the box. Then read the text on page 33 and check your answers.

resolution pixel aspect ratio colour depth video adapter plasma screen

1................................ - the smallest unit on a display screen or bitmapped image (usually

a coloured dot)

2.......................................... - an expansion card that generates the video signal sent to a

computer display

3.......................................... - the width of the screen in proportion to its height

4 ________________________ - a I so ca 11 ed gas discharge display

5 - the number of pixels contained in a display, horizontally and

vertically

6 ________________________ - the number of bits used to hold a colour pixel; this determines

the maximum number of colours that can be displayed

Read the text again and answer these questions.

1 What do CRT and LCD stand for?

2 How is the screen size measured?

3 What technology is used by active-matrix LCDs?

4 Which unit of frequency is used to measure the brightness of a display?

5 What substance produces light and colour when hit by electrons in a CRT monitor?

6 What are the three advantages of OLED displays?

I Display screens and ergonomics