A barcode reader a touchpad a webcam a touchscreen

Vocabulary: Input Devices

n. device : keyboard joystick lightpen scanner trackball barcode reader touchscreen digital camera microphone graphics tablet mouse device gamepad / joypad / control pad / / game controller software hardware solid state memory word processing

v. connect (to) control move transfer operate roll detect input (into) convert (into) display copy / make a copy select (from) produce draw download feature

Unit 4 ……. Output devices

Reading.

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

resolution . aspect ratio … colour depth pixel ……….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. ________________________ also called 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

2. Read the text again and answer these questions:

1. What do CRT and LCD stand for?

2. What does the quality of the display depend on?

3. How is the screen size measured?

4. What does the colour depth refer to? What does it depend on?

5. What refresh rate a monitor should have not to flicker?

6. What are the monitor safety standards used for?

7. What devices are used to adjust the image on the screen?

8. What technology is used by active-matrix LCDs?

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

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

11. What are the three advantages of OLED displays?