This document discusses multimedia input and output technologies. It defines multimedia as the combination of different media like text, images, sound and video into a single package. Input devices receive information from outside sources, like keyboards, mice, graphics tablets, and touch screens. Keyboards use switches to send unique signals for each key. Mice move a cursor by being dragged across a surface. Output devices communicate results externally through displays like CRT, LCD, LED, and plasma screens. CRT uses electron beams to project images on a screen, while LCD and LED screens use light-emitting technologies between pixels to display information.

1. MULTIMEDIA
I/O TECHNOLOGIES

2. MULTIMEDIA
• Many media
• Combination of media text , image ,sound and
movement
• Allow the end user to control
• Way of presenting contents through computer
and or electronics devices

3. DIFFERENCE BETWEEN GRAPHICS
AND MULTIMEDIA
• GRAPHICS
1.Visual representation
• MULTIMEDIA
1. Use of different
media to convey
information into a
single package

4. INPUT AND OUTPUT TECHNOLOGIES
• System to receive information from the
outside world - INPUT DEVICES
• Communicate results to the external world –
OUTPUT DEVICES

5. KEYBOARD
• Array of switches send unique signals when
pressed
• Key code stored in ROM
TYPES OF SWITCHES
RUBBER MECHANICAL

6. WORKING OF KEYBOARD

7. KEYBOARD
QWERTY KEYBOARD
COMPACT
KEYBOARD

8. Cont.
EROGONOMIC
VIRTUAL KEYBOARD

9. MOUSE
• Moved on smooth surface which cause the
movement of cursor on the screen
• Input the data and information into
computer system directly
• “Direct manipulation device”

10. TYPES
BALL MOUSE

11. OPTICAL MOUSE

12. GRAPHICS TABLET
•Allows the artists to sketch digitally
using pen or stylus

13. TRACK BALLS
• moveable ball mounted on a stationary device
• Pointing device
• Ball is placed on the top along with buttons

14. DIFFERENCE
TRACK BALLS MOUSE
1.Manually rotating the balls 1.Balls internally rotates by moving
over surface

15. JOY STICK
• Lever that moves in all the directions
• Stick that pivots on a base and is used for
controlling the action in video games
• Unlike mouse ,it continues moving in the
direction

16. TOUCH SCREENS
Monitors / Electronic visual display screens
- Detects where they are touched
- Make selection by directly touching the
screen rather than moving mouse

17. OUTPUT TECHNOLOGIES

18. DISPLAY CHARACTERISTICS
• Size of display
• Information content (total no of pixels)
• Resolution (pixel size)
• Color
• Brightness
• Picture quality

19. CRT
• Part of computer which looks like a TV set.
Image projection on the screen by using
electron beams.
• Color display also possible.

20. LCD SCREENS
• Fixed type displays
• Light source generated by fluorescent lamp
• Travels in one direction
• LCD cells controlled by applying electric
charge

21. LED DISPLAYS
• Semi-conductor light source
• Electronic device that lights up when
electricity is passed through it
• Requires more power than LCD display
devices
• Very useful for displaying relatively smaller
images

22. PLASMA DISPLAY
Ionised gases that lights when we pass the
electric current through it
• Lights up when electricity is passed through it
• Small cell is fitted with xenon and neon
gases and electrode used to apply the
electricity
• Electric current ionizing the gas mixture
and transform it into plasma and plasma
emits ultraviolet light