Chapter 3.2 B - Output devices FINAL BOARDS Flashcards
What is an actuator
an output device that converts electrical energy into mechanical movement
What is a solenoid
Coverts electrical signal into magnetic field producing linear motion.
Types of motion caused by actuators
Rotary or Linear
Adv of a DLP
Higher contrast ratios
More durable
Quieter running than an LCD
Smaller and lighter
Disadv of a DLP
Don’t have grey components in image
Colour saturation compared to LCD proj is lower
Adv of an LCD proj
sharper images than a dlp
better colour saturation
more efficient in energy use and gen less heat
Disadv of an LCD proj
Limited life span
Degrade over time
2 types of printers
Inkjet
Laser printers
2 Types of inkjet tech
Thermal bubble
Piezoelectric
What are 3D printers used for
to produce solid objects that actually work
Two types of binder 3D printing
Additive - adding materials layer by layer
Subtractive - removing materials layer by layer
What is Direct 3D printing
uses inkjet technology; a print head can move left right up and down to build layers.
How to create an object using a 3D printer
Make a CAD design
The drawing is imported to a software that prepares it in a format that the 3D printer can understand
The 3D printer is first set up to allow the solid object to be made
Then the object is built up in layers.
Object is prepared and left to cure after it has been made
Uses of 3D printing
Prosthetic limbs
Reconstructive surgery (face surgery) - is more precise since they can fit the skull exactly
Aerospace - lightweight and precision parts
Fashion and art
Making parts that are no longer in production
What is an LED screen
A screen made up of tiny light emitting diode which are either red, green or blue in colour.
Use of LEDs
Large outdoor displays
What is an LCD screen
Screens made up of tiny liquid crystals which make up an array of pixels that are affected by changes in applied electric fields
What is CCFL (LCD)
cold cathode fluorescent lamp - Back-lit method LCD uses.
Why LED backlighting better than CCFL
Max brightness reached immediately
Whiter light that sharpens the image and makes the colours appear more vivid; CCFL had a slightly yellowish tint
Brighter light - better colour definition
More durable
Consume little power - produce less heat and consume less energy
OLED full form
Organic Light emitting diode
ONE BIG IMP CHARACTERSITIC OF OLED
Very thin screens - can even be folded
Advantages of OLED
Thinner, lighter and more flexible
Give brighter light
Do not require backlighting
Very large field of view - about 170 degrees
What is a speaker
Output device that produces sound
Why is a projector used
used to project computer output onto larger screens or interactive whiteboards
Where are projectors often used
presentations
multimedia applications
What is thermal bubble (inkjet)
Tiny resistors heat the ink up. This causes the ink to expand into a bubble. Ink is ejected onto the paper. A vaccum is created when the bubble bursts which allows fresh ink to be drawn from the vaccum
What is piezoelectric
Crystal is located at the back of the ink reservoir for each nozzle. The crystal is given a tiny electric charge which makes it vibrate. This vibration forces ink to be ejected onto the paper.
Process of an inkjet printer
Doc sent to printer driver
Printer driver makes sure doc can be understood
The printer driver checks to make sure the printer can print (busy, out of paper, available, etc)
Data is sent to temp memory of printer called printer buffer
Sheet of paper is fed into the paper.
As the sheet goes through the printer, the printer head moves from side to side across the paper printing the text or image
This process repeats until the data in the printer buffer is empty
The printer sends an interrupt to the CPU for more data to be sent to the printer
Process repeats until entire doc is printed
What is a laser printer
Uses dry powdered ink instead of liquid ink.
Uses static electricity to produce texts and images
Can print entire sheet in one go.
4 toner cartridge: blue, cyan, magenta, black.
When are inkjet printers used
one-off photos
if only a few pages of good quality, colour printing is needed
When are laser printers used
produce high quality printouts and are very fast when making multiple copies of a document
high volume printing
advantages of laser printing over inkjet
they have large toner cartridges and large paper trays
