This document is a presentation by a group of 10 students from the BCSE department about computers. It discusses the basic parts and types of computers, including hardware, software, microcomputers, mini computers, mainframe computers, and super computers. It also covers the different generations of computers and types of computer monitors, such as CRT, LCD, LED, and OLED monitors. The presentation provides information on the advantages and disadvantages of each type of computer component and monitor technology.
2. Group Menbers
• Md.Surat Rahman
• Md.Robiul Awal
• Md.Tuhin Babu
• Md.Sanjidul Alam
• Md.Shohag Rana
• Mst.Teheran Akter
• Mst.Moushumi Akter
• Puja De
• Mst.Konok Akter
• Mst.Kobita Akter
0
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3. What Is Computer?
Computer:
• A computer is an electronic device that
manipulates information or data.It has the
ability to store,repair and process
data.We can use a computer to type
documents,send email and browse the
web.We can also use it to
accounting,database management,games
and more.
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4. Basic Parts Of Computer
Hardware: Hardware is any
part of computer that has a
physical tructure,such as
the computer monitor or
keyboard.
hardware
Software: Software is any set of
instructions that tells the
hardware what to do.It is
what guides the hardware
and tells tells it how to
naccomplish each
task.Some example of
software include web
browsers,games and word
processors such as
Microsoft Word.
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5. Categories Of Computers
General purpose computer:
1.General purpose computers are designed to solve large
varities of problem.
2.They can be given large amount of programmes to solve
different problems.
3.Usually they are used in our daily life activities.
Special purpose computer:
1.They are designed to solve specific types of problems.
2.They can be used to pocess only romeric data.
3.They are usually used by the scientific and researchers.
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6. Another three types computer
• Analog computer:
Old ,out dated computers.They calculate physical
quantities.eg.ammeter,voltage meter etc.
• Digital computer:
They use binary digits for processing.eg.PC.
• Hybrid computer:
They comprise the best of capabilities of digital and
analog computers.
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8. Classification of computer
Micro computer
1.Used for single user.
2.Consists of CPU,input
device,output device
and storage unite.
3.Most cheaper and
slowest computer.
Micro computer
Mini computer
1.Digital computer and multi-user
system.
2.Can support 4-200 users
simultaneously.
3.Most speedy than micro computer.
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9. Classification of computer
Mainframe computer
1.Multi-user,multi-programming
and high performance
computer.
2.Have high speed,high storage
capacity.
3.Have two terminetors,dumb and
intelligent terminal.
4.Also known as ‘Workstation’.
Mainframe computer
Super computer
1.Most speed and most expensive
computer.
2.Usually used by the scientists.
Super computer
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10. Charecteristics of computer
*Accuracy: It always gives us correct answer.
*Storage capacity: Computer has a huge storage capacity.
*Reliability: It always gives us correct answer.
*Diligence: Computer can not be tired after along time
work.
*Versatility: Computer is able to perform many types of
function.
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11. Generation of computer
First generation computer
Hardware: Used vacuum tuber for circuitry and magnatic drums for
memory.
Software: Machine language.
Input device: Punch card.
Output device: Printer.
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12. Generation of computer
Second generation computer
Hardware: Used transistors replaced vacuum tubes.
Software: Assembly language
Input device: Punch cards and paper tape.
Output device: Printer
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13. Generation of computer
Third generation computer
Hardware: Used Integrated Circuits chips(IC)
Software: Language.
Input device: key board.
Output device: Printer.
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16. Computer Monitor
Monitor
A computer monitor is an electronic device that shows
pictures. Monitors often look similar to televisions. The
main difference between a monitor and a television is that
a monitor does not have a television tuner to change
channels. Monitors often have higher display resolution
than televisions. A high display resolution makes it easier
to see smaller letter sand fine graphics.
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17. Different types of Monitor
CRT Monitor:
Advantage:
Since resolution is not defined at the outset, high-resolution
images can be displayed with no problem. Users of PC
home cinema can take full advantage of their graphics
cards and get an image of excellent quality. The blacks
are beyond reproach, and the images are fluid and
precise - in fact, very close to what cinema provides.
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18. Different types of Monitor
Disadvantage
Tri-tube projectors are heavy (more than 50 kg),
bulky and difficult to install, and are therefore
suitable only for fixed setups. Finally,
convergence adjustments (superimposing the
red, green and blue images) are difficult - which
can either take a lot of time or cost you a lot of
money.
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19. Different types of Monitor
LCD monitor:
Advantage
* LCD monitors display static images from computer sources extremely well with full
color detail and no screen burn-in.
*The number of pixels per square inch on an LCD display is typically higher than other
display technologies.
* LCD monitors are good at displaying large amount of data e.g. on an Excel
spreadsheet with exceptional clarity and precision.
They are available in many more sizes.
* They are not affected by increase or decrease in air pressure hence used in
airplanes.
* LCD technology is not prone to screen burn-in or ghosting.
*LCD televisions require substantially less power to operate than plasma.
* LCD monitors are generally better for public display such as airport signage and
retail store signage due to the bright room light environment.
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20. Different types of Monitor
Disadvantage
They suffer from a motion blur effect, where the
individual pixels are just slightly out of step with
the image on the screen. The high refresh rate
of LCD televisions can have some undesirable
effects on the picture. With LCD technology, as
the back light ages, it can change colors
slightly.
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21. Different types of Monitor
LED Monitor:
Advantage
It is very important to know that LED monitors are usually lighter and
thinner than LCD monitors , The fluorescent bulbs used in an LCD
monitor are bigger , heavier and They can make the monitor
bulkier as compared to the materials used in LED monitors .
You should know that LED monitors can be large enough but they will
not take too much space on the working desk , So They will cause
better visual quality for the user.
It is very important to know that LED monitors offer better and sharper
colour reproduction as compared to LCD monitors , and the
production of LED monitors has been increased which makes
them more affordable choices .
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22. Different types of Monitor
Disadvantage
It is very important to know that LEDs are more expensive than
conventional lighting technologies , They must be supplied with the
correct voltage and current at a constant flow , And this requires some
electronics expertise to design the electronic drivers .
You should know that LEDs can shift color due to age and temperature ,
And two different white LED will have two different color
characteristics, So , They affect how the light is perceived .
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23. Different types of Monitor
OLED Monitor:
Advantage
The biggest advantages of OLED displays are the things that photographers are most
likely to appreciate. Firstly, the color gamut is wider than that of an LCD display,
allowing more accurate reproduction of the colors of your images. Secondly,
thanks to the totally unlit black pixels, the contrast is really high, allowing a more
realistic impression of how your images will look. OLED displays have greater
viewing angles, allowing more flexible use of the camera, both for shooting and
reviewing images, or showing them to others.
Perhaps the feature that makes OLED most attractive for use in photography is its
speed. With refresh rates about 1,000 times quicker than an LCD, it can be used
to represent the increasingly fast live view output from the latest cameras with
ever improving realism. This is particularly important where the technology is
being used for electronic viewfinders, and a rapidly updating, smooth
representation of movement can help re-create the optical viewfinder experience.
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24. Different types of Monitor
Disadvantage
Outdoor performance.
As an emissive display technology, OLEDs rely completely upon converting
electricity to light, unlike most LCDs which are to some extent reflective; e-ink
leads the way in efficiency with ~ 33% ambient light reflectivity, enabling the
display to be used without any internal light source.
OLEDs typically produce only around 200 nits of light leading to poor readability
in bright ambient light, such as outdoors. Displays with some degree of
reflectiveness increase their brightness as ambient light increases, so
overcoming unwanted surface reflections without using any additional power.
Water damage.
Water can damage the organic materials of the displays. Therefore, improved
sealing processes are important for practical manufacturing. Water damage may
especially limit the longevity of more flexible displays.
Power consumption.
While an OLED will consume around 40% of the power of an LCD displaying an
image which is primarily black, for the majority of images, it will consume 60–80%
of the power of an LCD - however it can use over three times as much power to
display an image with a white background such as a document or website. This
can lead to disappointing real-world battery life in mobile devices.
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