Lecture topic 1.2.3 chal tu dj of dj jab h na dj Njan gb gk k kh gk kg dj

DISCOVER . LEARN . EMPOWER
University Institute of Engineering
DEPARTMENT OF COMPUTER SCIENCE
& ENGINEERING
Bachelor of Engineering (Computer Science & Engineering)
Subject Name: Computer Graphics with lab
Subject Code: 22CSH-352/22ITH-352
Prepared by:
Er. Puneet Kaur(E6913)
1
Interactive Graphics
Display Devices

University Institute of Engineering (UIE)
Department of Computer Science and Engineering (CSE)
Content
• Flat panel Display
 LCD
 LED

Flat Panel Display
• A flat-panel display is a thin screen display found on
all portable computers and is the new standard
for desktop computers.
• Unlike (CRT) monitors, flat-panel displays use liquid-
crystal display (LCD) or light-emitting diode
(LED) technology to make them much lighter and thinner
compared to a traditional monitor.
• Less weight ,volume and power requirement as compared
to CRT’S
Basic design of a plasma-panel
display device.

Flat Panel Display
• Flat-panel display technologies are sweeping through
markets all over the world
– Digital Signage, Home Theater
– Command and Control, Retail Displays
– Handheld Electronics (Cameras, PDAs, Phones)
• The Contenders
– Plasma Display Panels (PDPs)
– Thin-film Transistor Liquid Crystal Displays (TFT LCDs)
– Organic Light-emitting Diodes (OLEDs)
– Electroluminescent and Emissive Displays

Flat Panel Display
• The term flat–panel displays refers to a class of video devices
that have reduced volume, weight, and power requirements
compared to a CRT. A significant feature of flat-panel displayed is
that they are thinner than CRTs, and we can hang them on walls
or wear them on our wrists.

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.
– Light, sleek, energy-efficient, have
sharp picture.

LCD
• LCD stands for liquid crystal display. Your digital watch uses an
LCD to show you the time, and most portable computers use an
LCD to display the screen
• There is actually a liquid compound, liquid crystals, sandwiched
between two grids of electrodes.
• The electrodes can selectively turn on the different cells
or pixels in the grid to create the image you see.
• Very Common LCD applications:
• I. Calculators
• II.Watches
• III.Clocks
• IV.Telephones

LCD
• Parts of Liquid Crystal Display:
• LCD Panel is generally sandwiched between “Rear” and “Top”
polarizer’s.
• Polarizer main function is to improve the color and obviously
making it possible to see the screens of LCD’s. So if we remove
polarizer’s from LCD’s then undoubtedly it would be impossible
to identify the letters or graphics and everything.
• Following Figure shows LCD Panel, its parts

LCD Working

LCD
• liquid Crystal Display module shown in above figure is made up of
“2 layers”. It contains a layer of “LC(Liquid Crystal) Material”. LC
material is one through which Light passes, supplied by the Back
light.
• And White light from the back light place 2nd from the bottom in
figure passes through the LCD panel which generally operates
passage of light to form the Images projected on to the Mail Front
of the LCD panel screen.

Advantages of LCDs
• Power Consumption and Radiation Emission
– Consume less energy and more durable
• A typical CRT losses approximately 50% of its brightness after
10,000 hours. An LCD bulb will maintain its brightness
anywhere from 25,000 to 50,000 hours.
• LCD consumes fewer watts than a CRT. LCD will use an
average 30 watts compared to 120 watts for the CRT.
• Can reduce electric bill by 40-85%.
• Uses a combination of fluorescent-based backlight, color
filters, transistors, and liquid crystal to create and illuminate
images. It blocks light rather emit light

Advantages of LCDs
• Viewing
– Cause less eyestrain
– Does not flicker or glare
– Less power consumption

Disadvantages of LCDs
• Resolution
• Displays Native Resolutions (Resolution that it
displays best)
• Viewing Angle
• Smaller, needed to be viewed more directly from
the front.
• From the side the images on an LCD screen can
seem to disappear, or invert colors.
• Newer displays that are coming out have a wider
viewing angle so this is not as much of an issue as it
has been in the past.

• Price
– Upfront cost it is more costly but long-term cost but
will conserve energy in the long run.
– The energy savings may not be much for an individual
use, but for a corporate office where 50 displays or
more are in use, the energy savings might be more of
an issue.

• Installation
– Need a plug interface to connect to the computer.
– Some require a special digital plug-interface in order
to work .
– Problem: is that this plug is not available on most
computers, so another video card or adapter must be
purchased to plug these LCD monitors into the
computer.

• Response Time
– It is much slower. The delay can cause a ghosting
effect on images it displays.

REFERENCES
1. Hearn, D., Baker M. P. ,”Computer Graphics”, Pearson
education.
2. Newman, William M., Sproull, Robert F., “Principles of
Interactive Computer Graphics”, Tata McGraw Hill
Company, 2nd
Edition.
3. Nptel
Link https://nptel.ac.in/courses/106/106/106106090/

Lecture topic 1.2.3 chal tu dj of dj jab h na dj Njan gb gk k kh gk kg dj

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