Chapter 4 Display Devices Flashcards
What are some VDU types?
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CRT Liquid crystal display Led displays Plasma OLED Projection systems
What is a CRT device called?
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An electron gun.
What is a Dot pitch?
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Dot pitch is the measurement between the same spot in two vertically adjacent dot trios.
What is Resolution?
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Resolution is defined by how many software picture elements (pixels) are used to draw the screen.
Video memory is used to store?
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Rendered screen images.
Portable computers were designed to be?
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compact versions of their bigger desktop cousins.
As LCD elements got smaller?
The detail of patterns became greater.
These external LCD’s are available in either?
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Analog or digital interfaces
Two major types of LCD displays have been implemented over the years?
Active-Matrix screens and Passive-Matrix screens.
What is an Active Matrix?
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An active-matrix screen is made up of several independent LCD pixels.
What is an Passive Matrix?
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A Passive-matrix display does not have a dedicated transistor for each pixel or sub-pixel but instead a matrix of conducted traces.
The word plasma refers to?
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A cloud of ionized (charged particles- atoms and molecules with electrons in an unstable state.
What does OLED stand for?
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Organic light emitting diode
Another major category of Display device is?
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The video projection system
Projection systems are required to produce a?
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Lighted display
The refresh rate is technically?
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The vertical scan frequency
The refresh rate is?
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Selected for the monitor.
The first video technology for PCs was?
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Monochrome
IBM was the first with?
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Color
After a time people wanted better color so IBM came out with?
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Enhanced Graphics Adapter
IBM wanted to answer back more so they came out with the?
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Video Graphics array
Up until the late 1980’s IBM set most personal?
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Computer standards
IBM introduced a new technology?
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in 1990 known as the Extended Graphics array
One of the peculiarities of LCD,Plasma,OLED,and other flat-panel displays that they?
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have a single fixed resolution
The Contrast ratio is the ratio?
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of the luminance of the brightest color
