Comptia A+ 220-801 Chapter 4 Flashcards
The primary method of getting information out of a computer is to use a computer ? pg 198
video display unit (VDU)
What are the two types of signals used in monitors today? pg 198
Digital and Analog
Their are 6 types of VDU s. What are they?
CRT Liquid crystal display LED displays Plasma OLED Projection systems
What is Dot Pitch? PG 200
is the measurement between the same spot in two vertically adjacent dot trios.
What is the average measurement of a dot pitch? PG 200
0.28mm to 0.32mm
How is the resolution defined? pg 200
Resolution is defined by how many software picture elements (pixels) are used to draw the screen
What is a Advantage of having a higher resolution? pg 200
more information can be displayed in the same screen area.
What is a disadvantage of having a higher resolution? pg 200
a disadvantage is that the same objects and text displayed at a higher resolution appear smaller and might be harder to see.
They are called “plasma” displays because they use small cells containing electrically charged ionized gases, which are plasma pg 203
Plasma Displays
What is OLED? pg 206
organic light-emitting diode (OLED) is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound which emits light in response to an electric current.
How is the brightness of a projector measured? pg 207
This brightness is measured in lumens. A lumen (lm) is a unit of measure for the total amount of visible light that the projector gives off, based solely on what the human eye can perceive and not also on invisible wavelengths
What is refresh rate in CRT monitors? pg 209
is technically the vertical scan frequency and specifies how many times in one second the scanning beam of electrons redraws the screen in CRTs.
What is Degaussing?
is the process of decreasing or eliminating a remnant magnetic field. It is named after the gauss, a unit of magnetism, which in turn was named after Carl Friedrich Gauss.
What are the 5 primary groups of video adapters? pg 221
Monochrome CGA EGA VGA DVI, HDMI, and other modern digital video
What was the first video technology for PCs? pg 221
monochrome
Who developed the first adapter known as MDA (Monochrome Display Adapter) and what was the resolution?
IBM and 720x350 pixels
What is SVGA and what resolution did it support?
a set of graphics standards designed to offer greater resolution than VGA. SVGA supports 800 x 600 resolution, or 480,000 pixels.
Describe Aspect Ratio? pg 224
The term aspect ratio refers to the relationship between the horizontal and vertical pixel counts that a monitor can display.
Whats the MAX Resolution of SXGA+?
1400 x 1050
What is the contrast ratio? pg 226
is the measure of the ratio of the luminance of the brightest color to that of the darkest color the screen is capable of producing.
Whats the difference between Contrast Ratio vs Contrast?
Contrast ratios are generally fixed measurements that become selling points for the monitors. Contrast, on the other hand, is an adjustable setting on all monitors (usually found alongside brightness) that changes the relative brightness of adjacent pixels.
What do the i and P stand for in 1080i and 1080p pg 224
The i in 1080i refers to interlaced—vs. progressive (1080p) scanning
Plasma displays have always been expected
to have contrast ratios of around what?
5,000:1 or better.
Whats the difference between Active Matrix and Passive Matrix?
An active-matrix display, also known as a TFT (thin-film transistor) display, uses a separate transistor to apply charges to each liquid crystal cell and thus displays high-quality color that is viewable from all angles.
