Chapter 4 - Display Devices

Question 1

what are the special chemical dots in a CRT display that glow when electrons hit them?

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Answer 1

phosphors

Question 2

explain dot pitch to me

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Answer 2

its the distance from one dot in a trio to the same dot in an adjacent trio in a CRT display

Question 3

tell me the two types of LCD

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Answer 3

active - has dedicated transistor for each pixel

passive - does not, uses trace matrix instead

Question 4

how do you differentiate between LCD and LED?

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Answer 4

LCD - uses fluorescent bulbs as light source

LED - uses light emitting diodes as light source

Question 5

explain the soap opera effect

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Answer 5

unwanted artificial or noncinematic quality in the video, caused by high refresh rate in LCDs

Question 6

compare power usage of an OLED display to an LCD display

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Answer 6

OLED uses less on average, but as the screen turns to all white, it can use 2 to 3 times that of an LCD

Question 7

what does VDU stand for?

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Answer 7

video display unit

Question 8

what kind of gases are in standard bulbs?
what about projector bulbs?

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Answer 8

noble gases

metal halide

Question 9

you have just finished working with a portable projector. can you immediately unplug it from the power and go about your day or do you need to wait till the internal fan shuts off? why?

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Answer 9

need to wait for the fan to finish, because the fan needs to finish cooling the unit. if you don’t let it do its job, eventually the electronics and bulb will get burnt up

Question 10

what is refresh rate?

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Answer 10

the vertical scan frequency, it defines how many times per second the screen will get redrawn

Question 11

where can you go to change the refresh rate of your monitor?

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Answer 11

right click the desktop, go to screen resolution, then advanced settings link, then the monitor tab, then select the rate from the dropdown box

Question 12

you see the following message:

ATTENTION
87K / 69HZ
FREQUENCY IS OUT OF RANGE

what does this mean?

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Answer 12

you selected an unsupported refresh rate and because of this, you’re getting an internal monitor error

Question 13

what’s a path for adjusting the resolution in windows 7?

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Answer 13

control panel > all control panel items > display > screen resolution, then move the slider to the resolution you want

Question 14

you are working with your NVIDIA control panel. where will you find the option to change to the native resolution?

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Answer 14

go to “change flat panel scaling” under display in your task path, then click the link

Question 15

what does microsoft call its multimonitor feature?

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Answer 15

Dual View

Question 16

what is degaussing?

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Answer 16

the reduction of the magnetic field of an object

Question 17

do you have to degauss an LCD or LED?

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Answer 17

nope

Question 18

how can you tell when its time to degauss your CRT?

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Answer 18

screen is distorted, rainbow colors, this occurs from the buildup of magnetic field from electron bombardment

Question 19

tell me the 5 groups of display adapters

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Answer 19

monochrome
CGA
EGA
VGA
DVI, HDMI

Question 20

what’s another way to think of monochrome?

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Answer 20

black and white

Question 21

how many colors did CGA provide?

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Answer 21

4 at a time from a total palette of 16

Question 22

how many colors did EGA provide?

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Answer 22

16 at a time from a total palette of 64

Question 23

what does VGA stand for?

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Answer 23

video graphics array

Question 24

how is persistance of vision used in displays?

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Answer 24

in the interlaced technology, you scan every other line on each pass, but you do it fast enough that it tricks our eyes into seeing one continuous image

Question 25

what is contrast ratio?

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Answer 25

measure of the ratio of the luminance of the brightest color to that of the darkest color the screen is capable of producing

Question 26

what happens when you have more contrast?

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Answer 26

you’ll have a sharper, edgier image