Computer Output Module
the acronyms that describe a type computer monitor
-LCD (Liquid Crystal Display) -LED (Light emitting diode
output
-a spreadsheet printout -displaying a YouTube video on a TV screen -playing a song from spotify
characteristics of OLED technology
-capable of creating curved and extremely thin displays -currently more expensive to produce than LCD screens -use red, green, and blue LEDs to create each pixel -has the best possible contrast ratio -have the potential for making newspapers with video -costs approximately 5x more than competing display technologies
Plasma
-creates image using cells of ionized red, blue, and green gas -use cells of ionized gas to create images -becoming less popular -limited brightness may be a factor is a well-lit room
input
-entering text in a word processing program -recording a song using MIDI -putting a video from your phone onto your computer
select the characteristics of thermal printing
-paper turns black when heated -commonly used for printing receipts
output device
-projector -monitor -printer -speaker
LCD (liquid crystal display)
-refers to a type of monitor display -may have a relatively slow refresh rate sice it relies on molecular movement -because of their minimal power requirements, nearly all digital devices use liquid crystal displays -contrast ratio is not as great as competing technologies
ergonomics
-the study of human factors related to the things people use -can help improve mental concentration or improve physical capability by only providing necessary information to the user
inkjet printer
-uses ink cartridges -relatively low in initial cost -most common type of printer fro home use
laser printer
-uses toner cartridges -relatively high in initial cost
LED (light-emitting diode)
efficiently turn electrons in photons (light) and can provide very bright screens with very little energy
DPI (dots per inch)
the standard measure of printer quality
which of the following are true regarding high-definition displays
-typically have aspect ratios of 16:9 -typically have 1,080 horizontal lines of pixels
list the steps taken as a laser printer prints an image
1. laser 'removes' electrons from the drum 2. paper is fed between the drum and the toner 3. charged toner is attracted to the drum 4. toner is melted onto the paper
most digital devices use a ____________ port to attach peripherals
USB
contrast ratio
a description of the difference in the luminance of a display's white pixels compared to the black pixels
HDMI port
a port that allows the transfer of high quality video and audio signals
plotter
a type of printer that is used to print large graphic images such as architectural drawings by mechanically moving a pen over a large sheet of paper
projector
an output device that uses light to display video or image output on a surface
the number of bits of data describing each pixel in a display is referred to as ____________
color depth
frame rate
number of times per second a frame in a video is advanced
to convert sound waves into digital signals, each sound wave is __________
sampled
pixel
the smallest controllable
input device
-game controller -mouse -microphone -keyboard
additive manufacturing (AM)
AKA: 3D printing sprays successive layers of material to crate an object
the width of a screen compared to the height of a screen is referred to as ______________
aspect ratio
peripherals
printers, scanners, speakers, and external keyboards and other devices used with a computer
CPU (central processing unit)
refers to a computer's processor
the number of pixels in a display is called the display's _____________
resolution
the accuracy of a digital recording is determined by the device's _______________
sampling rate
optical media
such as DVDs and Blue-rays use reflective material that can be read by lasers to store data
Ultra HD
television displays with resolutions of at least 3840x260 pixels
screen size
the diagonal measure of the visible display
which of the following refer to ultra-high-definition television displays?
-8K UHD -4k UHD -Ultra HD
which of the following statements are true?
-DVDs and Blue-rays are considered optical media -DVDs use longer (red spectrum) lasers
printer manufacturers advertise the quality of their products by stating how many ____________ they produce
DPI (dots per inch)
ROM (read-only memory)
refers to a type of data storage
dot pitch
the distance between the center of 2 adjoining pixels on a display
refresh rate
the term that describes how fast each pixel in a display is refreshed or updated. the higher the refresh rate, the smoother the video