This presentation summarizes display and storage devices, including CRT, LCD, and floppy disks. CRT works by using an electron gun to fire electrons at phosphor dots on the screen, while LCD uses liquid crystals to display images without emitting light. Key advantages of CRT include better image quality and color, while disadvantages are larger size, health risks from radiation, and high voltage. LCD has advantages of being thinner, using less power, and producing less heat and radiation, but has disadvantages like narrower viewing angles and lower contrast. Floppy disks were an early portable storage device but had limitations of small storage capacity and slow access times.

1. Welcome
to our
Presentation
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2. Presentation on : Display Devices and Storage Devices.
Course Name : Computer Peripheral And Interfacing.
Course code : CSE3205
Submitted by, Submitted to,
Avijit Paul Id: CE18017 Rahmina Rubaiat,
Jotirmoy Roy Id: CE18028 Lecturer, Department of CSE
Md Abdul Mukit Id: CE18040 MBSTU, Tangail-1902
Chanchal Saha Id: CE18048
Anirban Chanda Id: CE18055
Samiul Haque Id: CE18019
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3. Contents
# CRT
# CRT work & display
# Advantages and Disadvantages of CRT
#LCD
# Advantges and Disadvantages of LCD
#Floppy Disk
# Advantages and Disadvantages of Floppy Disk
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4. CRT
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5. What is CRT ?
• CRT is the abbreviation of Cathode Ray Tube.
• It is a vaccum tube containg an electric gun ( a source of electrons ) and
a fluorescent screen , with internal or external means to accelerate and
deflect the electron beam , used to create images in the form of light
emitted from the fluorescent screen.
• The image may represent electrical waveforms ,pictures , radar targets
and others.
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6. How CRTs work & display ?
• A CRT monitor contains millions of tiny red,green and blue phosphor
dots that glow when struck by an electron beam that 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 vaccum created inside a glass tube.
• The electrons are negative and the screen gives a positive charge so the
screen glows.
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7. Cathode Ray Tube
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8. How CRTs work & Display
• The heated filament which heats a cathode , which emits electrons by
thermionic emission.
• These electrons are then attracted through a large potential difference to
a positive anode.
• The anode has a hole in the center through which a beam of electrons
flows.
• The x and y plats can apply an external field to deflect this beam.
• The beam then this a fluorescent screen and is deteced as light.
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9. Advantages of CRT
• The cathode rayed tube can easily increase the monitor’s brightness by
reflecting the light.
• They can produce more colours.
• The CRT monitors have lower price rate than the LCD display or plasma
display.
• The quality of the image displayed on a CRT monitors is superior to the
LCD and Plasma monitors.
• The colour features of the CRT monitor are considerd highly excellent.
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10. Disadvantages of CRT
• They have a big back and take up space in desk.
• The electromagnetic fields emitted by CRT monitors causes a health
hazard to the functioning of living cells.
• CRTs emit a small amount of X-ray radiations which can result in a
health hazard.
• Constant refreshing of CRT monitors can result headache.
• CRT operate at very high voltage which can overheat system or result in
an implosion.
• They are heavy to pick up and carry around.
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11. LCD
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12. Liquid Crystal
• A state of matter which has properties between those of
conventional liquids and those of solid crystals.
• For instance , a liquid crystal may flow like a liquid but its
molecules may be oriented in a crystal-like way.
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13. What is LCD ?
• A liquid crystal display (LCD) is a flat electronic display panel used as a
visual display aid.
• It uses liquid crystals to create a visual effects on screen.
• LCDs do not generate light on their own but rely on sunlight or room
light to generate images with the help of liquid crystal.
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14. Advantages of LCD
• Brightness: Produces very bright images due to high peak intensity. Very
suitable for for environments that are brightly lit.
• Emissions: Produce considerably lower electric, magnetic and
electromagnetic fields than CRTs.
• Geometric distortion: Geometric distortion at the native resolutions .
Minor distorton may occur for other resolutions.
• Power consumption: Energy efficient. Consume less than 1/3 the power
of a comparable CRT.Consumes less electricity than CRT and produce
little heat.
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15. Advantages of LCD
• Screen Shape: Completely flat screen.
• Sharpness: At the native resolutions, the image is perfectly sharp.
Adjusments are required at all other resolutions which can result in
mesurable degradation to the image.
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16. Disadvantages of LCDs
• Aspect ratio: The aspect ratio and resolution are fixed .
• Contrast: Lower contrast than CRTs due to a poor black level.
• Cost: More expensive than CRTs.
• Viewing anlge: Restricted viewing angles.Viewing angles affect the
brightness , contrast and colors shown. Wide angle can leed to contrast
and color reversal.
• Resolution: Works best at the native resolution. The native resolution can
not be changed.
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17. Floppy Disk
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18. What is floppy disk?
• Floppy disk is a storage medium capable of holding electronic data, like
a computer file.
• It was created in 1967 by IBM.
• Some types of floppy disk
– 8-inch drive
– 5¼-inch drive
– 3½-inch drive
– Zip drive
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Floppy disk:

20. How does a floppy disk store data?
• A floppy drive is a magnetic medium that stores and reads data on the
floppy disk using a read head.
• When a 3.5" floppy diskette is inserted into the drive, the metal slide
door is opened to expose the inner magnetic disk.
• The read/write head uses a magnetic polarity of 0 or 1.
• Reading this as binary data, the computer can
understand what the data is on the platter.
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22. Advantages of floppy disk
• Portable & inexpensive
• Small & cheap
• Easy to carry
• Easy to transport and handle
• Useful for transferring a small file
• It can be used to transfer data from one computer to another computer
• Secure tab to stop data from being overwritten
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23. Disadvantages of floppy disk
• The access time of floppy disk low
• Small storage capacity
• Heat can be also damaged floppy disk
• Many new computers don’t have any floppy disk drive
• Data can be erased if the disk comes into contact with a magnetic field
side
• Slow to access and retrieve data when compared to a hard-disk device
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24. Thank you.
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