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Lecture 5
Video and Sound
Summary of Previous
 We have learnt,
 Reasons why some computer users prefer alternative
methods of input over a standard keyboard or mouse.
 Input data by touch
 Game controllers
 Input data by light
 Other input types, e.g. audio, video etc.
 When to use which input device?
 Practical
Today’s Topics
 Monitors
 Monitors and Video Cards
 Video Cards
 Ergonomics and Monitors
 Data Projectors
 Sound Systems
Multimedia
 The word ‘multimedia’ comes from the
Latin word multus means ‘numerous’ and
media which means ‘middle’ or Centre.
 Multimedia consists a large number of
visual media like graphics, image,
animation etc
Visual Display Devices
 Primary user hardware for displaying visual
media such as graphics, text, images.
 Consists of components such as Monitor, Video
adapter card, video adapter cable.
 Various such devices are CRT, color CRT,
DVST, Flat Panel Displays (LCD & Plasma),
LED monitors, etc.
Monitor
 It is a most common output device
 A monitor or display (also called screen
or visual display unit) is an electronic
visual display for computers.
 Originally, computer monitors were used
for data processing while television
receivers were used for entertainment.
Monitor
Monitor
 Quality of picture we see on monitor
depends upon,
Monitor quality itself
Video controller.
 From the 1980s onwards, computers (and
their monitors) have been used for both
data processing and entertainment.
Technologies
 Different image technique have been used for
computer monitors.
 Until the 21st
century most monitors were CRT
but they have been phased out for LCD
monitors.
 They are categorized by color output.
 Monitors connects to the video card of a
computer system.
10
Monitors Types
 Different types of monitors exists, which
are;
Monochrome
Grayscale
Color
Monochrome Monitor
 A monochrome monitor is a type of CRT computer
display which was very common in the early days of
computing.
 From the 1960s through the 1980s, before color monitors
became popular.
 They are still widely used in applications such as
computerized cash register systems.
 Green screen was the common name for a
monochrome monitor.
 They are abandoned in early-to-mid 1980’s.
Monochrome Monitor
Grayscale Monitors
 A special type of monochrome monitor capable
of displaying different shades of gray.
 They are also known as black-and-white, are
composed exclusively of shades of gray, varying
from black at the weakest intensity to white at
the strongest.
 Early grayscale monitors can only show up to
sixteen different shades
Grayscale Monitor
Color Monitors
 A display monitor capable of displaying many colors.
 Color Monitors works like a monochrome one, except
that there are three electron beams instead of one.
 The three guns represent additive colors (red, green and
blue) although the beam they emit are colorless.
 Each pixel includes three phosphors, red, green and
blue, arranged in a triangle.
 When the beam of each of these guns are combined and
focused on a pixel, the phosphors light up.
Color Monitors
 The monitors can display different colors by combining
various intensities of three beams.
Mixing of Colors
 The most popular display today remains
Color monitors CRT.
 It has been available for more than 70 years.
 CRT is used.
 Cost less than LCD monitors.
What is being used today?
History of the Cathode Ray
 1855- Heinrich Geissler creates the mercury pump, the first good
vacuum tubes. Sir William Crookes uses these to produce the first
cathode rays.
 1858- Julius Plücker bends cathode rays using a magnet
 1869- J.W. Hittorf establishes that the “rays” travel in straight lines
 1883- Heinrich Hertz concludes incorrectly that cathode rays are not
made up of particles because they are not deflected by electrically
charged metal plates
 1895- Jean-Baptiste Perrin shows that cathode rays are particles
because they deposit a negative charge where they impact
 1897- J.J. Thomson discovers electrons using cathode rays
How Monitor Works?
 Most use a cathode-ray tube as a display
device.
 CRT: Glass tube that is narrow at one end
and opens to a flat screen at the other
end.
 Electrons travel through a vacuum sealed
container from the cathode (negative) to the
anode (positive).
 Because the electrons are negatively charged,
they are repelled away from the cathode, and
move across the tube to the anode.
 The ray can be affected by a magnet because of
its relation to positive and negative charges
How Monitor Works?
Some Anatomy of the CRT
 Anode- Positively Charged, Ray travels towards this
 Cathode- Negatively Charged, Ray travels away from
this
Cathode Ray Tube (CRT) Monitors
 A CRT monitor contains millions of tiny red, green, and
blue phosphor dots that glow when struck by an electron
beam. Electron beam travels across the screen to create
a visible image.
 In a CRT monitor tube, the cathode is a heated filament.
 The heated filament is in a vacuum created inside a
glass tube. The electrons are negative and the screen
gives a positive charge so the screen glows.
Basic Cathode Ray Tube
 Electrons excite phosphor to glow
 Electrons fired from the back
 Phosphor is arranged in dots called pixels
 Dot mask ensures proper pixel is lit
Phosphore
 It is a semi-conducteur material which emits visible
radiation in response to the impact of electrons.
(i.e. when it absorbs energy from some source such
as an electron beam, it releases a portion of this
energy in the form of light).
 In response to a sudden change in the electron
beam(from on to off), the light emission does not fall
instantaneously, there is a gradual reduction challed
‘fluorescence’ .
Scanning Pattern of CRT Electron
Gun
 The electron gun scans from left to right and
 From top to bottom.
 Refreshing every phosphor dot in a zig-zag pattern.
Advantages of CRT
 The cathode rayed tube can easily increase the
monitor’s brightness by reflecting the light.
 They produce more colours
 The Cathode Ray Tube monitors have lower price rate
than the LCD display or Plasma display.
 The quality of the image displayed on a Cathode Ray
Tube is superior to the LCD and Plasma monitors.
 The contrast features of the cathode ray tube monitor
are considered highly excellent.
Disadvantages of CRT
 They have a big back and take up space on desk.
 The electromagnetic fields emitted by CRT monitors
constitute a health hazard to the functioning of living
cells.
 CRTs emit a small amount of X-ray band radiation which
can result in a health hazard.
 Constant refreshing of CRT monitors can result in
headache.
 CRTs operate at very high voltage which can overheat
system or result in an implosion
 Within a CRT a strong vacuum exists in it and can also
result in a implosion
 They are heavy to pick up and carry around
CRT Monitor
Liquid Crystal Display - Monitor
 It is a flat panel display, electronic visual
display, or video display that uses the light
modulating properties of liquid crystals
(LCs).
 LCs do not emit light directly .
LCD History
 Liquid crystals were first discovered in 1888 by Austrian
botanist Friedrich Reinitzer.
 RCA, an American Laboratory made the first experimental
LCD in (1968).
 Manufacturers have been developing creative variations and
improvements since on LCDs.
 In 1997, manufactures began to offer full size LCD monitors
as alternatives to CRT monitors.
 Until recently, was only used on notebook computers and
other portable devices.
LCD Technology
 Used for displays in notebooks, small computers, pagers,
phones and other instruments.
 Uses a combination of fluorescent-based backlight, color
filters, transistors, and liquid crystal to create and
illuminate images.
 Until recently, was only used on notebook computers and
other portable devices.
From CRT to LCD
 CRT
Bulky, heavy, use vacuum tube
technology.
Using technology that was
developed in the 19th
century.
 LCD
First LCD laptop monitors were
very small due to manufacturing
costs but now are available in a
variety of sizes.
Light, sleek, energy-efficient, have
sharp picture.
Liquid Crystal Display
 There are mainly two categories of LCD.
The passive matrix LCD
The Active matrix LCD
Passive Matrix LCD
 Monochrome passive-matrix LCDs were standard in
most early laptops.
 Still being used today for applications less demanding
than laptops and TVs.
 It consisting of a grid of horizontal and vertical wires.
 At the intersection of each grid is an LCD element
which constitutes a single pixel, either letting light
through or blocking it.
 Passive matrix LCD
 Pixels arranged in a grid
 Pixels are activated indirectly
 Row and column are activated
 Animation can be blurry
Lecture 5
Passive Matrix Display
Active Matrix LCD
 Active-matrix LCDs depend on thin film
transistors (TFT).
 TFTs are tiny switching transistors and capacitors.
 They are arranged in a matrix on a glass
substrate.
 Each pixel is activated directly
 Pixels have 4 transistors
 One each for red, green, blue
 One for opaqueness
 Animation is crisp and clean
TFT LCD Screen
Advantages of LCD
 The sharpness of a LCD display is at maximum tweak
ness.
 High peak intensity produces very bright images. Best
for brightly lit environments.
 Screens are perfectly flat.
 Thin, with a small footprint. Consume little electricity and
produce little heat
 The LCD display unit is very light and can be put
anywhere or moved anywhere in the house.
 Lack of flicker and low glare reduce eyestrain.
Disadvantages of LCD
 After a while the LCD display the some of the
pixels will die you will see a discoloured spot on
a black spot on the display.
 The cost of a LCD is considerably at a high
price.
 The LCD display will have slow response times.
 The LCD display has a fixed resolution display
and cannot be changed.
 The viewing angle of a LCD display is very
limited.
Other types of Monitors
 Paper-white displays
High contrast between fore and background
 Electro-luminescent displays (ELD)
Similar to LCD
Uses phosphor to produce light
 Plasma monitor
Gas is excited to produce light
Paper White Display
NASA -Electroluminescent displays
Plasma Monitors
Monitor Specifications
 Monitor Specifications can be judged
through,
Size
Resolution
Refresh rate
Dot pitch
Size
 A monitor’s size affect how well we can see images.
 With a larger monitor, we can make the objects on the
screen appear bigger.
 Monitors are measured diagonally, in inches, across the
front of the screen.
 A 17 inch monitor measures 17 inches from the lower left
to the upper right corner.
 CRT monitors viewing area is smaller than the monitor’s
overall size.
Resolution
 The images you see on your monitor are made of tiny
dots called pixels.
 The term resolution refers to the sharpness and clarity of
an image.
 A monitor resolution is determined by the number of
pixels on the screen. It is expressed as a Matrix.
 The more pixels a monitor displays, higher will be its
resolution. Clearer will be images appear.
 For example 640 X 480 resolution means that there are 640
pixels horizontally across the screen and 480 pixels vertically
down the screen.
Resolution
 Actual resolution is determined by the video controller.
 Most monitors can operate at several different resolutions. They
are
 640 X 480
 800 X 600
 1024 X 768
 1152 X 864
 1280 X 1024
 As the resolution increases, image on the screen gets
smaller.
Resolution Settings
Standards
 There are various standards for monitor
resolution.
Video Graphics Array standard is 640 X 480
pixels.
Super VGA is 800 x 600 and 1024 x 768.
 Today, nearly all color monitors can be set
to higher resolution.
Refresh Rate
 Monitor refresh rate is the number of times per second
that the electron guns scan every pixel on the screen.
 Refresh rate is important because phosphor dots fade
quickly after the electron gun charges them with
electrons.
 If the screen is not refreshed, it will appear to flicker.
 Refresh rate is measured in Hz or Cycles per second.
 If the monitor refresh rate is 100 Hz, it means that it
refreshes its pixels 100 times every second.
Refresh Rate
Dot Pitch
 It is the distance between the same color
dots
 Ranges between .15 mm and .40 mm
 Smaller creates a finer picture
 Should be less than .22
Dot Pitch
Video Cards
 Interface between computer and a display device.
 Unless a computer has graphics capability built into the
motherboard, the video card is required.
 The CPU, working in conjunction with software
applications, sends information about the image to the
video card. The video card decides how to use the pixels
on the screen to create the image. It then sends that
information to the monitor through output interface.
Evolution of Video Cards
 IBM introduced first video card in 1981,
named Monochrome Display Adapter
(MDA).
 MDA provided text-only displays of green
or white text on a black screen.
Parts of Video Card
How Video card works?
 At most common resolution settings, a screen
displays over a million pixels, and the computer
has to decide what to do with every one in order
to create an image.
 To do this it needs something to take binary data from
the CPU and turn it into a picture you can see.
 Unless a computer has graphics capability built
into the motherboard, that translation takes
place on the graphics card.
 The CPU, working in conjunction with software
applications, sends information about the image
to the graphics card.
 The graphics card decides how to use the pixels
on the screen to create the image.
 It then sends that information to the monitor
through a cable.
 It is capable of rendering 3D images.
How Video card works?
Video Card - GPU
 Similar to CPU but designed specifically to
perform complex mathematical and geometric
calculations necessary for graphics rendering.
 Less congestion on the system bus
 Reduction in the workload of CPU
Graphics GPU
Video Card - GPU
 Operations: bitmap transfers, painting, window
resizing and repositioning, line drawing, font
scaling and polygon drawing etc.
 Some GPUs have image enhancement
algorithms built-in.
Video Card - GPU
 Some of the latest GPUs
have more transistors
than average CPU and
produce a lot of heat.
Heat-sinking and fan
cooling are required
Video Card - Memory
 When a video card is connected within the
motherboard, it will use the computers random access
memory (RAM).
 If it is not connected to the motherboard though, the
video card often has its own memory known as Video
RAM (VRAM).
 The capacity of VRAM in modern video cards ranges
from 125 to almost 800 MB.
Video Card Memory
 In 2006, DDR technology was the base of the VRAM.
 The clock rate of the memory was between 300 MHz
and 1.7 GHz.
 The Z-buffer is an important part of the video memory. It
takes care of the depth coordinates in 3D graphics
Modern cards have up to 512 MB RAM
Ergonomics and Monitors
 Eyestrain
It is the fatigue of the eyes
Steps to avoid
 Choose a good monitor
 Place the monitor 2 – 3 feet away
 Center of screen below eye level
 Avoid reflected light
Ergonomics and Monitors
 Electronic magnetic fields (EMF)
Generated by all electronic devices
EMF may be detrimental to health
Steps to avoid
 Keep the computer at arms length
 Take frequent breaks
 Use an LCD monitor
Data Projectors
 A video projector is an image projector
that receives a video signal and projects
the corresponding image on a projection
screen using a lens system.
Data Projectors
 They replaced overhead and slide projectors.
 Project image onto wall or screen
 LCD projectors
 Most common type of projector
 Small LCD screen
 Very bright light
 Require a darkened room
Data Projectors
 Digital Light Projectors
A series of mirrors control the display
May be used in a lighted room
Example is Cinema Projectors
Sound Systems
 It is an integral part of the computer
experience
 Capable of recording and playback
Sound Systems
 Sound card are the,
Device between the CPU and speakers
Converts digital sounds to analog
Can be connected to several devices
Modern cards support Dolby Surround Sound
Sound Card
Sound Systems
 Headphones and headsets
Replacement for speakers and microphones
Offer privacy
Does not annoy other people
Outside noise is not a factor
Headsets have speakers and a microphone
Practical
Goal for your display settings
 Screen resolution – 1024 x 768
 Dots Per Inch – “Large Size”
(120 DPI)
 Base Fonts - “Large Fonts”
Changing your computer’s display settings
Then, click
here to open
the Control
Panel
Click Start button
Opening “Display” window
Double-click on
“Display”
Re-setting Resolution
Next, move slider-bar to adjust
resolution to 1024 by 768
pixels
First, click
“Settings” tab
Getting to “Dots Per Inch”
Then, click the “Advanced”
button to set Dots Per Inch
Resetting Dots Per Inch (DPI)
Change DPI
setting to “Large
Size” (120 DPI)
How does everything look now?
 At this point, close the Display settings window and see
how your desktop screens look. If nothing has changed,
try rebooting.
 If you find that everything, including desktop icons and
text, is now very, very tiny, you may also need to reset
your base font size.
Resetting base font size
Click the
“Appearance”
tab
Set to
“Large
Fonts”
Summary
 We have learnt
Different types of monitors and their uses
Cathode Ray Tube
Video Cards
Sound Cards
Practical
THE END

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Lecture 5

  • 2. Summary of Previous  We have learnt,  Reasons why some computer users prefer alternative methods of input over a standard keyboard or mouse.  Input data by touch  Game controllers  Input data by light  Other input types, e.g. audio, video etc.  When to use which input device?  Practical
  • 3. Today’s Topics  Monitors  Monitors and Video Cards  Video Cards  Ergonomics and Monitors  Data Projectors  Sound Systems
  • 4. Multimedia  The word ‘multimedia’ comes from the Latin word multus means ‘numerous’ and media which means ‘middle’ or Centre.  Multimedia consists a large number of visual media like graphics, image, animation etc
  • 5. Visual Display Devices  Primary user hardware for displaying visual media such as graphics, text, images.  Consists of components such as Monitor, Video adapter card, video adapter cable.  Various such devices are CRT, color CRT, DVST, Flat Panel Displays (LCD & Plasma), LED monitors, etc.
  • 6. Monitor  It is a most common output device  A monitor or display (also called screen or visual display unit) is an electronic visual display for computers.  Originally, computer monitors were used for data processing while television receivers were used for entertainment.
  • 8. Monitor  Quality of picture we see on monitor depends upon, Monitor quality itself Video controller.  From the 1980s onwards, computers (and their monitors) have been used for both data processing and entertainment.
  • 9. Technologies  Different image technique have been used for computer monitors.  Until the 21st century most monitors were CRT but they have been phased out for LCD monitors.  They are categorized by color output.  Monitors connects to the video card of a computer system.
  • 10. 10 Monitors Types  Different types of monitors exists, which are; Monochrome Grayscale Color
  • 11. Monochrome Monitor  A monochrome monitor is a type of CRT computer display which was very common in the early days of computing.  From the 1960s through the 1980s, before color monitors became popular.  They are still widely used in applications such as computerized cash register systems.  Green screen was the common name for a monochrome monitor.  They are abandoned in early-to-mid 1980’s.
  • 13. Grayscale Monitors  A special type of monochrome monitor capable of displaying different shades of gray.  They are also known as black-and-white, are composed exclusively of shades of gray, varying from black at the weakest intensity to white at the strongest.  Early grayscale monitors can only show up to sixteen different shades
  • 15. Color Monitors  A display monitor capable of displaying many colors.  Color Monitors works like a monochrome one, except that there are three electron beams instead of one.  The three guns represent additive colors (red, green and blue) although the beam they emit are colorless.  Each pixel includes three phosphors, red, green and blue, arranged in a triangle.  When the beam of each of these guns are combined and focused on a pixel, the phosphors light up.
  • 16. Color Monitors  The monitors can display different colors by combining various intensities of three beams.
  • 18.  The most popular display today remains Color monitors CRT.  It has been available for more than 70 years.  CRT is used.  Cost less than LCD monitors. What is being used today?
  • 19. History of the Cathode Ray  1855- Heinrich Geissler creates the mercury pump, the first good vacuum tubes. Sir William Crookes uses these to produce the first cathode rays.  1858- Julius Plücker bends cathode rays using a magnet  1869- J.W. Hittorf establishes that the “rays” travel in straight lines  1883- Heinrich Hertz concludes incorrectly that cathode rays are not made up of particles because they are not deflected by electrically charged metal plates  1895- Jean-Baptiste Perrin shows that cathode rays are particles because they deposit a negative charge where they impact  1897- J.J. Thomson discovers electrons using cathode rays
  • 20. How Monitor Works?  Most use a cathode-ray tube as a display device.  CRT: Glass tube that is narrow at one end and opens to a flat screen at the other end.
  • 21.  Electrons travel through a vacuum sealed container from the cathode (negative) to the anode (positive).  Because the electrons are negatively charged, they are repelled away from the cathode, and move across the tube to the anode.  The ray can be affected by a magnet because of its relation to positive and negative charges How Monitor Works?
  • 22. Some Anatomy of the CRT  Anode- Positively Charged, Ray travels towards this  Cathode- Negatively Charged, Ray travels away from this
  • 23. Cathode Ray Tube (CRT) Monitors  A CRT monitor contains millions of tiny red, green, and blue phosphor dots that glow when struck by an electron beam. Electron beam travels across the screen to create a visible image.  In a CRT monitor tube, the cathode is a heated filament.  The heated filament is in a vacuum created inside a glass tube. The electrons are negative and the screen gives a positive charge so the screen glows.
  • 24. Basic Cathode Ray Tube  Electrons excite phosphor to glow  Electrons fired from the back  Phosphor is arranged in dots called pixels  Dot mask ensures proper pixel is lit
  • 25. Phosphore  It is a semi-conducteur material which emits visible radiation in response to the impact of electrons. (i.e. when it absorbs energy from some source such as an electron beam, it releases a portion of this energy in the form of light).  In response to a sudden change in the electron beam(from on to off), the light emission does not fall instantaneously, there is a gradual reduction challed ‘fluorescence’ .
  • 26. Scanning Pattern of CRT Electron Gun  The electron gun scans from left to right and  From top to bottom.  Refreshing every phosphor dot in a zig-zag pattern.
  • 27. Advantages of CRT  The cathode rayed tube can easily increase the monitor’s brightness by reflecting the light.  They produce more colours  The Cathode Ray Tube monitors have lower price rate than the LCD display or Plasma display.  The quality of the image displayed on a Cathode Ray Tube is superior to the LCD and Plasma monitors.  The contrast features of the cathode ray tube monitor are considered highly excellent.
  • 28. Disadvantages of CRT  They have a big back and take up space on desk.  The electromagnetic fields emitted by CRT monitors constitute a health hazard to the functioning of living cells.  CRTs emit a small amount of X-ray band radiation which can result in a health hazard.  Constant refreshing of CRT monitors can result in headache.  CRTs operate at very high voltage which can overheat system or result in an implosion  Within a CRT a strong vacuum exists in it and can also result in a implosion  They are heavy to pick up and carry around
  • 30. Liquid Crystal Display - Monitor  It is a flat panel display, electronic visual display, or video display that uses the light modulating properties of liquid crystals (LCs).  LCs do not emit light directly .
  • 31. LCD History  Liquid crystals were first discovered in 1888 by Austrian botanist Friedrich Reinitzer.  RCA, an American Laboratory made the first experimental LCD in (1968).  Manufacturers have been developing creative variations and improvements since on LCDs.  In 1997, manufactures began to offer full size LCD monitors as alternatives to CRT monitors.  Until recently, was only used on notebook computers and other portable devices.
  • 32. LCD Technology  Used for displays in notebooks, small computers, pagers, phones and other instruments.  Uses a combination of fluorescent-based backlight, color filters, transistors, and liquid crystal to create and illuminate images.  Until recently, was only used on notebook computers and other portable devices.
  • 33. From CRT to LCD  CRT Bulky, heavy, use vacuum tube technology. Using technology that was developed in the 19th century.  LCD First LCD laptop monitors were very small due to manufacturing costs but now are available in a variety of sizes. Light, sleek, energy-efficient, have sharp picture.
  • 34. Liquid Crystal Display  There are mainly two categories of LCD. The passive matrix LCD The Active matrix LCD
  • 35. Passive Matrix LCD  Monochrome passive-matrix LCDs were standard in most early laptops.  Still being used today for applications less demanding than laptops and TVs.  It consisting of a grid of horizontal and vertical wires.  At the intersection of each grid is an LCD element which constitutes a single pixel, either letting light through or blocking it.  Passive matrix LCD  Pixels arranged in a grid  Pixels are activated indirectly  Row and column are activated  Animation can be blurry
  • 38. Active Matrix LCD  Active-matrix LCDs depend on thin film transistors (TFT).  TFTs are tiny switching transistors and capacitors.  They are arranged in a matrix on a glass substrate.  Each pixel is activated directly  Pixels have 4 transistors  One each for red, green, blue  One for opaqueness  Animation is crisp and clean
  • 40. Advantages of LCD  The sharpness of a LCD display is at maximum tweak ness.  High peak intensity produces very bright images. Best for brightly lit environments.  Screens are perfectly flat.  Thin, with a small footprint. Consume little electricity and produce little heat  The LCD display unit is very light and can be put anywhere or moved anywhere in the house.  Lack of flicker and low glare reduce eyestrain.
  • 41. Disadvantages of LCD  After a while the LCD display the some of the pixels will die you will see a discoloured spot on a black spot on the display.  The cost of a LCD is considerably at a high price.  The LCD display will have slow response times.  The LCD display has a fixed resolution display and cannot be changed.  The viewing angle of a LCD display is very limited.
  • 42. Other types of Monitors  Paper-white displays High contrast between fore and background  Electro-luminescent displays (ELD) Similar to LCD Uses phosphor to produce light  Plasma monitor Gas is excited to produce light
  • 46. Monitor Specifications  Monitor Specifications can be judged through, Size Resolution Refresh rate Dot pitch
  • 47. Size  A monitor’s size affect how well we can see images.  With a larger monitor, we can make the objects on the screen appear bigger.  Monitors are measured diagonally, in inches, across the front of the screen.  A 17 inch monitor measures 17 inches from the lower left to the upper right corner.  CRT monitors viewing area is smaller than the monitor’s overall size.
  • 48. Resolution  The images you see on your monitor are made of tiny dots called pixels.  The term resolution refers to the sharpness and clarity of an image.  A monitor resolution is determined by the number of pixels on the screen. It is expressed as a Matrix.  The more pixels a monitor displays, higher will be its resolution. Clearer will be images appear.  For example 640 X 480 resolution means that there are 640 pixels horizontally across the screen and 480 pixels vertically down the screen.
  • 49. Resolution  Actual resolution is determined by the video controller.  Most monitors can operate at several different resolutions. They are  640 X 480  800 X 600  1024 X 768  1152 X 864  1280 X 1024  As the resolution increases, image on the screen gets smaller.
  • 51. Standards  There are various standards for monitor resolution. Video Graphics Array standard is 640 X 480 pixels. Super VGA is 800 x 600 and 1024 x 768.  Today, nearly all color monitors can be set to higher resolution.
  • 52. Refresh Rate  Monitor refresh rate is the number of times per second that the electron guns scan every pixel on the screen.  Refresh rate is important because phosphor dots fade quickly after the electron gun charges them with electrons.  If the screen is not refreshed, it will appear to flicker.  Refresh rate is measured in Hz or Cycles per second.  If the monitor refresh rate is 100 Hz, it means that it refreshes its pixels 100 times every second.
  • 54. Dot Pitch  It is the distance between the same color dots  Ranges between .15 mm and .40 mm  Smaller creates a finer picture  Should be less than .22
  • 56. Video Cards  Interface between computer and a display device.  Unless a computer has graphics capability built into the motherboard, the video card is required.  The CPU, working in conjunction with software applications, sends information about the image to the video card. The video card decides how to use the pixels on the screen to create the image. It then sends that information to the monitor through output interface.
  • 57. Evolution of Video Cards  IBM introduced first video card in 1981, named Monochrome Display Adapter (MDA).  MDA provided text-only displays of green or white text on a black screen.
  • 59. How Video card works?  At most common resolution settings, a screen displays over a million pixels, and the computer has to decide what to do with every one in order to create an image.  To do this it needs something to take binary data from the CPU and turn it into a picture you can see.  Unless a computer has graphics capability built into the motherboard, that translation takes place on the graphics card.
  • 60.  The CPU, working in conjunction with software applications, sends information about the image to the graphics card.  The graphics card decides how to use the pixels on the screen to create the image.  It then sends that information to the monitor through a cable.  It is capable of rendering 3D images. How Video card works?
  • 61. Video Card - GPU  Similar to CPU but designed specifically to perform complex mathematical and geometric calculations necessary for graphics rendering.  Less congestion on the system bus  Reduction in the workload of CPU
  • 63. Video Card - GPU  Operations: bitmap transfers, painting, window resizing and repositioning, line drawing, font scaling and polygon drawing etc.  Some GPUs have image enhancement algorithms built-in.
  • 64. Video Card - GPU  Some of the latest GPUs have more transistors than average CPU and produce a lot of heat. Heat-sinking and fan cooling are required
  • 65. Video Card - Memory  When a video card is connected within the motherboard, it will use the computers random access memory (RAM).  If it is not connected to the motherboard though, the video card often has its own memory known as Video RAM (VRAM).  The capacity of VRAM in modern video cards ranges from 125 to almost 800 MB.
  • 66. Video Card Memory  In 2006, DDR technology was the base of the VRAM.  The clock rate of the memory was between 300 MHz and 1.7 GHz.  The Z-buffer is an important part of the video memory. It takes care of the depth coordinates in 3D graphics Modern cards have up to 512 MB RAM
  • 67. Ergonomics and Monitors  Eyestrain It is the fatigue of the eyes Steps to avoid  Choose a good monitor  Place the monitor 2 – 3 feet away  Center of screen below eye level  Avoid reflected light
  • 68. Ergonomics and Monitors  Electronic magnetic fields (EMF) Generated by all electronic devices EMF may be detrimental to health Steps to avoid  Keep the computer at arms length  Take frequent breaks  Use an LCD monitor
  • 69. Data Projectors  A video projector is an image projector that receives a video signal and projects the corresponding image on a projection screen using a lens system.
  • 70. Data Projectors  They replaced overhead and slide projectors.  Project image onto wall or screen  LCD projectors  Most common type of projector  Small LCD screen  Very bright light  Require a darkened room
  • 71. Data Projectors  Digital Light Projectors A series of mirrors control the display May be used in a lighted room Example is Cinema Projectors
  • 72. Sound Systems  It is an integral part of the computer experience  Capable of recording and playback
  • 73. Sound Systems  Sound card are the, Device between the CPU and speakers Converts digital sounds to analog Can be connected to several devices Modern cards support Dolby Surround Sound
  • 75. Sound Systems  Headphones and headsets Replacement for speakers and microphones Offer privacy Does not annoy other people Outside noise is not a factor Headsets have speakers and a microphone
  • 77. Goal for your display settings  Screen resolution – 1024 x 768  Dots Per Inch – “Large Size” (120 DPI)  Base Fonts - “Large Fonts”
  • 78. Changing your computer’s display settings Then, click here to open the Control Panel Click Start button
  • 80. Re-setting Resolution Next, move slider-bar to adjust resolution to 1024 by 768 pixels First, click “Settings” tab
  • 81. Getting to “Dots Per Inch” Then, click the “Advanced” button to set Dots Per Inch
  • 82. Resetting Dots Per Inch (DPI) Change DPI setting to “Large Size” (120 DPI)
  • 83. How does everything look now?  At this point, close the Display settings window and see how your desktop screens look. If nothing has changed, try rebooting.  If you find that everything, including desktop icons and text, is now very, very tiny, you may also need to reset your base font size.
  • 84. Resetting base font size Click the “Appearance” tab Set to “Large Fonts”
  • 85. Summary  We have learnt Different types of monitors and their uses Cathode Ray Tube Video Cards Sound Cards Practical

Editor's Notes

  1. The cathode ray tube (CRT) is a vacuum tube containing an electron gun (a source of electrons) and a fluorescent screen used to view images. It has a means to accelerate and deflect the electron beam onto the fluorescent screen to create the images. The image may represent electrical waveforms (oscilloscope), pictures (television, computer monitor), radar targets and others. CRTs have also been used as memory devices, in which case the visible light emitted from the fluoresecent material (if any) is not intended to have significant meaning to a visual observer (though the visible pattern on the tube face may cryptically represent the stored data). The CRT uses an evacuated glass envelope which is large, deep (i.e. long from front screen face to rear end), fairly heavy, and relatively fragile. As a matter of safety, the face is typically made of thick lead glass so as to be highly shatter-resistant and to block most X-ray emissions, particularly if the CRT is used in a consumer product. CRTs have largely been superseded by more modern display technologies such as LCD, Plasma, LED and OLED, which offer lower manufacturing and distribution costs. A cathode ray tube is a vacuum tube which consists of one or more electron guns, possibly internal electrostatic deflection plates, and a phosphor target. In television sets and computer monitors, the entire front area of the tube is scanned repetitively and systematically in a fixed pattern called a raster. An image is produced by controlling the intensity of each of the three electron beams, one for each additive primary color (red, green, and blue) with a video signal as a reference. In all modern CRT monitors and televisions, the beams are bent by magnetic deflection, a varying magnetic field generated by coils and driven by electronic circuits around the neck of the tube, although electrostatic deflection is commonly used in oscilloscopes, a type of diagnostic instrument.
  2. Insider information A projector is rated in lumens. This is a measure of how bright the projector is. Higher lumens ratings result in a brighter projector. For a guide to lumens ratings, see http://www.projectorpeople.com/tutorials/lumen-guide.asp.
  3. Insider information The PS2 game SOCOM II Navy Seals includes a USB headset to allow verbal communication with other team members.