An unassuming dark gray surface can suddenly transform into an artist's canvas, an engineer's gauges, a writer's page or your very own window to both the real world and a huge range of artificial worlds! Because we use them daily, many of us have a lot of questions about our displays and may not even realize it. What does "aspect ratio" mean? What is dot pitch? How much power does a display use? What does "refresh rate" mean? In this edition of HowStuffWorks , we will answer all of these questions and many more!
By the end of the article, you will be able to understand your current display and also make better decisions when purchasing your next one! The Basics Often referred to as a monitor when packaged in a separate case, the display is the most-used output device on a computer.
The display provides instant feedback by showing you text and graphic images as you work or play. Most desktop displays use a cathode ray tube CRT , while portable computing devices such as laptops incorporate liquid crystal display LCD , light-emitting diode LED , gas plasma or other image projection technology.
Because of their slimmer design and smaller energy consumption, monitors using LCD technologies are beginning to replace the venerable CRT on many desktops. When purchasing a display, you have a number of decisions to make. These decisions affect how well your display will perform for you, how much it will cost and how much information you will be able to view with it.
Your decisions include:. In the following sections we will talk about each of these areas so that you can completely understand how your monitor works! Display Technology Displays have come a long way since the blinking green monitors in text-based computer systems of the s. Just look at the advances made by IBM over the course of a decade:. If you have been around computers for more than a decade, then you probably remember when NEC announced the MultiSync monitor.
Up to that point, most monitors only understood one frequency, which meant that the monitor operated at a single fixed resolution and refresh rate.
You had to match your monitor with a graphics adapter that provided that exact signal or it wouldn't work. This technology allows a monitor to understand any frequency sent to it within a certain bandwidth. The benefit of a multi-scanning monitor is that you can change resolutions and refresh rates without having to purchase and install a new graphics adapter or monitor each time.
Because of the obvious advantage of this approach, nearly every monitor you buy today is a multi-scanning monitor. UXGA can support a palette of up to The maximum resolution normally depends on the number of colors displayed. For example, your card might require that you choose between A typical UXGA adapter takes the digital data sent by application programs, stores it in video random access memory VRAM or some equivalent, and uses a digital-to-analog converter DAC to convert it to analog data for the display scanning mechanism.
Once it is in analog form, the information is sent to the monitor through a VGA cable. See the diagram below:. You can see that a VGA connector like this has three separate lines for the red, green and blue color signals, and two lines for horizontal and vertical sync signals. In a normal television , all of these signals are combined into a single composite video signal.
The separation of the signals is one reason why a computer monitor can have so many more pixels than a TV set. Because VGA technology requires that the signal be converted from digital to analog for transmission to the monitor, a certain amount of degradation occurs.
DVI keeps data in digital form from the computer to the monitor, virtually eliminating signal loss. TMDS takes the signal from the graphics adapter, determines the resolution and refresh rate that the monitor is using and spreads the signal out over the available bandwidth to optimize the data transfer from computer to monitor. DVI is technology-independent. Essentially, this means that DVI is going to perform properly with any display and graphics card that is DVI compliant.
If you buy a DVI monitor, make sure that you have a video adapter card that can connect to it. Viewable Area Two measures describe the size of your display: the aspect ratio and the screen size. LCD Monitors:. Its working principle of this monitor is — images display with help of series of monochrome pixels, when light falls on those pixels.
Main objective of creating that technology to be used in television sector, but now this LCD use in home appliance, and very eminent example of this technology is Calculator screen and digital watch. LED acronym is light-emitting diodes. Now these days, use these types of latest technology because it looks as flat panel.
Plasma Display Panel:. Plasma Display panel has a flat panel display, and mostly this is implemented in television display. In this technology, two cluster of glass contain the mixture of neon and xenon gases, various small cell placed in between those cluster. In this technology, gas in cell is electrically converted into plasma. TFT is full name is thin-film transistor , and this technology is used in the LCD for enhancing the picture quality over other past technologies such as CTR.
TFT LCD contains pixels, but these pixels have own transistors that provide huge flexibility along with his control over all pictures and colors.
DLP monitors have to capabilities for providing high definition on the screen. These types of monitors help to provide gray scale type screen display, and these display screens are more useful for playing the video games otherwise for other video editing software as well. Touch Screen Monitor:. These monitors store all events and further proceed to controller for executing of their logged events. On the touch screen, display various images or text, users can create interaction between device and user while touching those images otherwise other text.
These types of monitors do not use very commonly in the market, these are more premium model. There are various internal parts of computer monitor screen , and every part has own special functionalities such as.. LCD Screen: Mostly, computer monitor screen are liquid crystal displays which are constructed by thin film transistors. Layered Glass: LCD computer monitor screen is made of various layers of glass, which manipulates this light while displaying on the computer monitor screen. Laptop Stands: Thin plastic display stands have to use for LCD displays, main motive to design for that computer monitor screen is to decrease the physical boundation for placing on the desk.
Power Connector: These connectors are used for connecting one component to other components. Interface Board: Interface board has to use for entire control over all functionality of computer screen monitor. Reflectors and Light Sources : While using of them, have been projected light beam on the computer monitor screen. Amplifier Circuit: Amplifier circuit helps to amplify the all video signals which are reached on the computer screen. CRT cathode-ray tube : CRT has to use three major components are the electron gun, phosphor viewing surface, and finally glass envelope.
There are many types of computer monitor function and here we will spread the light on various monitor function in computer with uses one by one. Pixel: Huge amount of pixels are existed in the screen of computer monitor which have small square form dots in nature.
Some people are also called of picture elements, and when electron beams get more heat then those pixels can turn on the illuminate mode. They can be empty with decreasing the intensity of beams, displaying the pictures on screen while activating the pattern of pixel elements. Every picture elements are stored in the RAM as code form which is inserted input with keyboard. Best quality of computer screen totally depends upon the huge number of pixels on the monitor that means if more pixels are presented on the monitor screen then picture quality much better, and those pixels might be different colors with their intensities which help to display the picture.
Best Resolution: Better computer monitor resolution varies according the number of pixel which has to provide help for displaying the image on the computer screen.
The total number of horizontal pixel is known as main resolution as well as total number of line which display on the computer monitor is known as vertical resolution.
Frame Structure : Frame structure is computer screen which have to contain fully information on the computer screen is called the frame. Frame rate must be more high for continuing images on the monitor, but one problem can be created like as laser flickering while high frame rate. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Prev NEXT. Computer Peripherals. Computer Monitors. Cite This!
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