2. Display Devices
A display device is an output device
for presentation of information in
visual
or in tactile form
When the input information is
supplied as an electrical signal, the
display is called an electronic display
4. Segment Displays
Some displays called segment displays can show only
digits or alphanumeric characters. They are, because they
are composed of several segments that switch on and off to
give appearance of desired glyph. The segments are usually
single LEDs or liquid crystals. They are mostly used in
digital watches and pocket calculators.
Seven-segment display: most common, usually digits only
Fourteen-segment display
Sixteen-segment display
HD44780 LCD controller: a widely accepted protocol for LCDs.
5. 2D Displays
2-dimensional displays that cover a full area (usually a
rectangle) are also called video displays, since it's the main
modality of presenting video.
Full-area 2-dimensional displays are used in, for example:
Television sets
Computer monitors
Head-mounted display
Broadcast reference monitor
Medical monitors
10. Anaglyph 3D
Anaglyph 3D
Anaglyph 3D is the name given to the stereoscopic 3D
effect achieved by means of encoding each eye's image
using filters of different (usually chromatically opposite)
colors, typically red and cyan
And old technology and usually the 3d quality is not
good, and color quality is poor
Screen independent,
any display can be used
12. Polarized 3D
Polarized 3D
A polarized 3D system uses polarization
glasses to create the illusion of three-
dimensional images by restricting the light that
reaches each eye
14. Active Shutter 3D
Active Shutter 3D
An active shutter 3D system (AKA: alternate frame sequencing,
alternate image, AI, alternating field, field sequential or eclipse
method) is a technique of displaying stereoscopic 3D images, works by
openly presenting the image intended for the left eye while blocking the
right eye's view, then presenting the right-eye image while blocking the
left eye, at a speed high enough to not be perceived by human sight, thus
allowing the images to be perceived as fused into a single 3D image
Active shutter 3D systems generally use liquid crystal shutter glasses
16. Active vs Passive
Active 3D Glasses
Active Shutter
Passive 3D Glasses
Anaglyph
Polarized
Active vs Passive: Comparison
http://www.ebay.com/gds/Whats-the-Difference-Between-
Active-and-Passive-3D-TV-Glasses/26040/g.html
18. Connectors
VGA (D-sub)
Analog. Common
S-Video
Analog. SD video
DVI
Digital. HD video
HDMI
Digital. HD video and audio
DisplayPort
High/Cross Compatibility.
Latest Trend
20. Plasma Displays
Usually used in TVs
Utilizes small cells containing electrically charged ionized
gases, or what are in essence chambers more commonly
known as fluorescent lamps
21. LCD Monitors
LCD: Liquid Crystal Display
Passive Matrix
Active Matrix
o TFT LCD
23. TN
TN: Twisted Nematic
Most common technology and also the oldest.
Short response times
High brightness
Less power consumption
Low cost
Color shifts, especially at wider viewing angles
No true color (24bit) support. Only 18bit (6bit per channel
instead of 8). Therefore unable to display the 16.7 million
colors
Display interpolated 24bit color using a dithering method that
combines adjacent pixels to simulate the desired shade
24. IPS
IPS: In-Plane Switching
Wide viewing angle
Accurate colors
High cost
25. TN, VA, IPS
TN vs IPS vs VA
http://www.tnpanel.com/tn-vs-ips-va/
TN vs VA vs IPS
http://asia.cnet.com/lcd-types-tn-vs-va-vs-ips-
62213690.htm
26. LCD Panel Tests
Online LCD Monitor Panel Type Evaluator
http://www.mediachance.com/pbrush/monitor.html
The Lagom LCD monitor test pages
http://www.lagom.nl/lcd-test/
27. Backlight
A backlight is a form of illumination used in LCDs.
As LCDs do not produce light themselves (unlike
CRTs), they need illumination (ambient light or a
special light source) to produce a visible image
Common Light Sources
CCFL: Cold Cathode Fluorescent Lamp
LED: Light Emitting Diode
Early TFT-LCD monitors used a CCFL backlit and
modern ones usually comes with a LED backlit.
Therefore they are called LED monitors. Those LED
monitors are LCD monitors (with LED backlight)
28. Backlight
CCFL vs LED
http://www.wikivs.com/wiki/CCFL_backlight_vs_LED
_backlight
http://www.screentekinc.com/backlight-ccfl-led-
explained.shtml
CCFL LED
Size Thicker and Heavier Thinner and Lighter
Cost Cheaper Expensive (slightly), but affordable
Power Higher Power consumption &
Heat generation
Lower Power consumption and
Heat generation
Brightness Lower brightness Generally higher brightness
Lifespan Shorter lifespan Longer lifespan
29. Issues with LCD monitors
Defective Pixels
Hot Pixel
o Pixel Always On
o White
Dead Pixel
o Pixel Always Off
o Black
Stuck Pixel
o 1 or 2 sub-pixels Always On or Off
o Display inaccurate colors
30. Check Defective Pixels
Can be done manually changing background colors
Or using software
Or Online
Online Defective Pixel Tests
http://mydeadpixeltest.com
http://www.checkpixels.com
http://www.gdargaud.net/Hack/DeadPixels.html
31. CRT vs LCD
CRT
Best Color Quality
Faster Response Time (0)
True Black
Multiple Frequency support
Multi Sync, Multi-Resolution
Lower Cost
Higher Power Consumption
Higher Heat generation
Higher Radiation
Higher Space
Higher Weight
LCD
o Not as good as CRT
o Response time usually >=5ms
o Can not display true black
o Poor multi-frequency support
o Poor quality in non-native resolutions
o Higher Cost
o Lower Power Consumption
o Lower Heat generation
o Lower Radiation
o Lower Space
o Lower Weight
http://bootstrike.com/Articles/LCDvsCRT/
http://compreviews.about.com/od/multimedia/a/CRTvsLCD.htm
http://en.wikipedia.org/wiki/Comparison_of_CRT,_LCD,_Plasma,_and_OLED
32. OLED
OLED: Organic Light-Emitting Diode
An OLED is a LED in which the emissive
electroluminescent layer is a film of organic compound
An OLED display works without a backlight. Thus, it
can display deep black levels and can be thinner and
lighter than a LCD. In low ambient light conditions
such as a dark room an OLED screen can achieve a
higher contrast ratio than an LCD
AMOLED: Active Matrix OLED
A display technology for use in mobile devices and
televisions
35. Power Consumption
Important
CRT displays consume low power
when displaying Black/Dark colors
LCD displays (both CCFL and LED
backlit) consume low power when
displaying White/Light colors
OLED displays consume low power
when displaying Black/Dark colors
36. Power Consumption
Generally, displays with a backlight need high power
to display black/dark colors. Less power to display
white. Backlight is always on and white is the default
color. LCD have to block the white light to display other
colors, and it takes some extra power. To display black,
about 3% more power needed (a little more).
Displays that do not use a backlight consume least
power to display black and full power to display white.
In those displays, the difference is significant and it
is/was encouraged to use darker backgrounds as
possible
Some Few New LCD displays use some advanced
technologies (such as zone control, changing the backlight
brightness accordingly to the colors displayed…) and they
may consume little lesser power to display black.
37. Power Consumption
Tips
Generally, Old CRTs and Future OLEDs are better with dark
colors.
Currently most displays are LCD and therefore the color
does not matter much. Even though Lighter colors save
some power, other factors such as eye strain etc. favor
darker colors.
Anyway, it is always better to Reduce the Display
Brightness and it ALWAYS saves power, as it does reduce
the color of the backlight. Also it is good for eyes.
Do not reduce brightness too much and also do not reduce
the Contrast. Usually reducing contrast does nothing good.
In LCD, Blank or Dark Screensavers are not power savers.
But Turn off the display feature is a huge power-saver as
it does turn off both Monitor and Graphic Processing
(VGA/GPU switched off)