We call screen (or monitor) the display device from the computer. There are usually two families screens:

The screens in cathode-ray tube (CRT noted for Cathode Ray Tube) fitted most desktop computers. These monitors bulky and heavy, with a high power consumption. Flat screens fitted to all laptops, personal digital assistants (PDAs), digital cameras, and that more and more computers. It is slim screens in depth (hence the name), with a lightweight and low power consumption.

LCD Screen

The monitors are often characterized by the following:

The definition: the number of dots (pixels) screen that can display the number of points is usually between 640×480 (640 points in length, 480 points in width) and 2048×1536, but higher resolutions are technically possible . The table below provides definitions recommended by the diagonal size:

Diagonal Definition

• 15 “800×600
• 17 “1024×768
• 19 “1280×1024
• 21 “1600×1200

The size: It is calculated by measuring the diagonal of the screen and is expressed in inches (one inch equals 2.54 cm). It is important not to confuse the definition of the screen and its size. Indeed a screen of a given size can display different definitions, however, generally large screens have a better definition. The standard size screens are (non-exhaustive list):

• 14 inches, a diagonal of 36 cm;
• 15 inches, a diagonal of 38 cm;
• 17 inches, a diagonal of 43 cm;
• 19 inches, a diagonal of 48 cm;
• 21 inches. is a diagonal of 53 cm;

Dot pitch: This is the distance between two phosphors; more it is small the image is more accurate. Not a mask less than or equal to 0.25 mm will provide a good comfort of use, while the screens with no mask greater than or equal to 0.28 mm will be banned.

Resolution: It determines the number of pixels per unit area (pixels per linear inch (DPI in English: Dots Per Inch, translate dots per inch). A resolution of 300 dpi means 300 columns and 300 rows of pixels on a square inch which would thus 90,000 pixels on a square inch. The reference resolution of 72 dpi gives us a pixel 1 / 72 (one inch divided by 72) is 0.353mm, corresponding to a pica (unit typographical Anglo-Saxon) .

LCD Monitor

The graphical modes

We call the graphical display of information on the screen in terms of definition and number of colors. It represents the ability of a graphics card to handle details or a screen display.

MDA : Fashion MDA (Monochrome Display Adapter), published in 1981, is the display screens providing a monochrome display text mode of 80 columns by 25 rows. Displays only ASCII characters.

CGA : The CGA mode (color graphic adapter) is published in 1981 shortly after the MDA mode with the arrival of the PC (personal computer). This graphical mode enabled:

display mode improved text that displays characters with 4 colors
display mode to display graphics pixels in 4 colors with a resolution of 320 pixels by 200 (rated 320×200)

EGA : EGA mode (Enhanced Graphics Adapter) emerged in early 1985. It displays 16 colors with a resolution of 640 by 350 pixels (640×350 noted) or more for graphics mode CGA.

XGA : In 1990, IBM introduced the XGA (Extended Graphics Array). Version 2 of this display, called XGA-2 offered a resolution of 800 x 600 in 16 million colors and 1024 x 768 with 65,536 colors.

SVGA : The mode SVGA (Super Video Graphics Array) is a graphics mode to display 256 colors at resolutions of 640×200, 640×350 and 640×480. The SVGA display also allows higher definitions such as 800×600 or 1024×768 displaying fewer colors.

VESA : To overcome the lack of standardization of graphical modes a consortium of major manufacturers of graphics cards has created (the VESA, Video Electronics Standards Association) to develop standards graphics.

SXGA : The standard SXGA (Super Extended Graphics Array) defined by the VESA consortium refers to a resolution of 1280 x 1024 in 16 million colors. This method has the characteristic of having a ration of 5:4 unlike other modes (VGA, SVGA, XGA, UXGA).

UXGA : The mode UXGA (Ultra Extended Graphics Array) defines a resolution of 1600 x 1200 with 16 million colors.

WXGA : The method WXGA (Wide eXtended Graphics Array) defines a resolution of 1280 x 800 with 16 million colors.

WSXGA : The method WSXGA (Wide Super Extended Graphics Array) defines a resolution of 1600 x 1024 with 16 million colors.

WSXGA + : The method WSXGA + (Wide Super Extended Graphics Array +) defines a resolution of 1680 x 1050 with 16 million colors.

WUXGA : The mode WUXGA (Wide Ultra Extended Graphics Array) defines a resolution of 1920 x 1200 with 16 million colors.

QXGA : The method QXGA (QXGA) defines a resolution of 2048 x 1536 with 16 million colors.

QSXGA : The method QSXGA (Quad Super Extended Graphics Array) defines a resolution of 2560 x 2048 with 16 million colors.

QUXGA : The method QUXGA (Quad Ultra eXtended Graphics Array) defines a resolution of 32000 x 2400 with 16 million colors.

Laptop Screen

The laptop has become common today, often replacing the desktop computer. Practice par excellence, it has become an indispensable tool for both lawyers who move often or wish to work from home as lawyers for enjoying the latest technology trends and aesthetic.

In short, full of good reasons to be pleased with good machines, barely more expensive than desktops.
But making the right choice is imperative, as it is true that for this type of product, the “beautiful is not enough” … he asks much more!

What is Laptop?

In Wikipedia : A laptop computer, also known as a notebook computer, is a small personal computer designed for mobile use. A laptop integrates all of the typical components of a desktop computer, including a display, a keyboard, a pointing device (a touchpad, also known as a trackpad, or a pointing stick) and a battery into a single portable unit. The rechargeable battery is charged from an AC/DC adapter and has enough capacity to power the laptop for several hours. Read full article in Wikipedia

Which laptop for what use?

Choosing a laptop depends primarily on the use you intend to do. Indeed, there are a multitude of diverse mobile features you will not necessarily useful. It is therefore important before buying a laptop to determine your needs for computer terms.

If you think you often work on your laptop, think comfort of the latter including the size of the screen. If you regularly travel or you want to work from home, autonomy and weight are two criteria that should not be overlooked.If you intend to make use of professional and personal, we must still know what services and tools that you want to avoid having to buy or not you end up with unneeded programs.

To determine the best portable Ideally, we suggest you study a number of factors to consider.

The essential factors for choosing the right laptop

• Processor

The purpose of a laptop is not usually have a powerful processor. It is therefore not required to pay a high price for this item unless you have special needs of computing power very special. The low-frequency processor consumes less, which means greater autonomy.

If autonomy and silence are essential for you, you must equip latest type of Pentium-M (included in notebooks labeled “Centrino”). These Pentium-M frequency equal to the performance of Pentium 4-M. The portable type “transportable” for their use of conventional processors (such as fixed PCs) that affect the noise associated with the breakdown and autonomy. Note that the performance of a processor are the same as a Pentium 4-M.

For Apple computers, the processor has fewer because there is only one manufacturer and an offer simplified.

• Memory

Memory is an important element to take into account insofar as it can affect how your laptop and its use over time. It is therefore advisable to choose a computer with at least 256 MB.Indeed, applications and operating systems taking more and more space, if your memory is too small, it may slow down your machine and play on autonomy in a negative way.It is possible, inexpensive and fairly easy to add memory thereafter. To do this, you must equip a laptop that has a single memory card home so you can save a second. In principle, a laptop often 2 memory slots. You must verify that the purchase memory that is installed occupies one of these slots.
Note also that many or too much memory (over 512 MB) may diminish somewhat the autonomy of your laptop.

• Weight

This criterion is particularly important and indispensable when you choose to buy a laptop for work while traveling or at home.

To have a really light laptop, take a ultraportable (based on Pentium III-M for example). The latter will have a small screen (12 or 14 “) but will weigh about 1.5 kg included.Otherwise, you will find about 2.5 kg more conventional models equipped with screen 14 or 15 “, which represents a good compromise between comfort and overall weight.

If this criterion is essential, it should really avoid models transportable screen with 16 or 17 “and PC processor sets.

• Autonomy

If you do not have the opportunity to stay connected to an electrical outlet when you use your laptop, autonomy is paramount. In this case, you need a battery-type Li-ion (Lithium ion) and not NiMH (Nickel Metal Hydride). Indeed, the battery type Li-ion allows autonomy and a better life because they do not “memory effect”.

• Screen Size

The size of the screen is a comfort criteria to be considered especially if you intend to use standard office applications. It becomes very difficult and tiring quickly to work when the screen is too small and that its resolution is poor.
Today, the screens exist diagonally 12, 14, 15, 16 and 17 “knowing that most laptops are equipped with screens diagonally 15″ and propose a resolution that can be variable. The best test is to live the machine you want to buy to make sure you do not deceive you and check the native resolution of the screen.

Finally, it should be noted that even if comfort is paramount in your choice of screen sizes play a lot on the price and congestion of the laptop.

• Connectors and drive

It is necessary that your computer is equipped with different takes to help you do change with external peripherals to suit your needs and your desires.

Thus, it is essential that your laptop has at least two USB ports and to connect to the Internet, to work with a USB-key that allows you to store information without having to always carry your computer but also to possibly add a player floppy insofar as laptops today are rarely equipped.

In addition to USB ports, your laptop must also have an ethernet port, a modem and an output.
It may also have FireWire ports (for the video, connecting to a backup hard disk …), parallel and serial (for connecting old printers or modems), PS / 2 (keyboard and mouse), VGA networks (for a second screen or a video projector, or S-Video and composite video (to connect to a TV) and son (for external speakers and a microphone).

As for players, laptops are all supplied with an optical drive whose features can be varied.The optical drive can read CD-ROMs or DVDs and in some cases to burn CD-RW or DVD /-RW. Readers “combo” and “MultiDrive” are increasingly common and offer the possibility for the first burn CD-RW and DVD read and the second read DVD-ROM and burn DVD-R . Finally, the ultra-light laptops are often provided without internal drive. In this case, it is proposed in the form of an external unit to connect via laptop to a USB port.

The useful

In addition to the traditional elements which are filled notebooks “classic” you have the opportunity to acquire various objects to your work as a second battery to extend autonomy, a small Webcam for video (image somewhat fluid), a subscription Internet type “nomad” to connect from anywhere with the internal modem, or even abroad, a Wi-Fi for Internet connection in public places including an attached anti-theft security for the office or public place. ..
Among all these additions, there is one you can not move you to carry your laptop: the bag, which often is not sold with the computer.

Buy your laptop

Order mobile Internet has advantages and disadvantages. Indeed, bought online often costs less but does not allow you to receive advice and an efficient after-sales service. It is difficult to return the laptop when it was a technical problem, for example. Buy your laptop to a local dealer is more expensive but allows you to make a choice easier and safer to the extent that you may be advised live and ask any questions relating to your needs. In addition, after-sales service will be better able to address your questions and problems you might encounter.

Finally, the public distribution. Shows the price advantage but should be avoided for those who have not already good skills and looking at this as effective counseling.Finally, the public distribution. Shows the price advantage but should be avoided for those who have not already good skills and looking at this as effective counseling.

You can buy laptop from :

Amazon

Bestbuy

Circuitcity