A monitor is the main output device of a computer. The two main types of monitors in use today are the liquid crystal display (LCD), also known as a flat panel display, and the cathode ray tube (CRT), which is an older technology. Each has advantages and disadvantages.
Most older monitors today use cathode ray tube technology, which was first developed for use in televisions. The cathode is a negatively charged electrode that shoots a beam of electrons towards a positively charged electrode, known as the anode. The cathode ray tube is a vacuum tube that contains one or more electron guns (cathodes) at one end, which fire a stream of electrons at a screen at the other end. The inside of the screen is covered by a dot matrix made up of phosphorescent material, known as phosphor. When phosphors are struck by electrons, they emit light. The phosphors are arranged in groups of three, known as a pixel. Each pixel contains a dot that emits one of three basic colors: red, green, and blue. Magnetic coils in the tube control the direction of the electron flow and a control grid determines the color scheme on the screen. The flow of electrons starts at the top of the screen moving from left to right, line by line to build an image.
On the other hand, an LCD monitor uses a layer of liquid crystal material sandwiched between two electrode grids, one arranged in columns and the other in rows. These grids, in turn, are surrounded by a layer of polarizing material made of plastic or glass. These polarizing layers are aligned to prevent light from passing through when the electrodes are not activated.
To generate an image, light passes through the first polarized layer. As light passes through the liquid crystal material, the polarity changes to allow it to pass through the second polarized layer. This is done by manipulating the electrode grids. Pixels are made up of liquid crystal cells that change the direction of light passing through them in response to a grid of electrodes.
Today’s LCD monitors more commonly use what is known as thin film transistor (TFT) technology, in which a transistor is placed at each intersection of the electrode grids, enhancing the signal and therefore image quality. This is also known as an active matrix display, as opposed to the earlier technology known as a passive matrix display.
There are many features to consider when choosing a monitor. Some of the most important are: screen size, resolution, dot size, refresh rate, and response time. Screen size refers to the diagonal length of the screen surface. Resolution refers to the number of pixels the monitor can display, for example 640 x 480, which indicates 640 pixels horizontally by 480 pixels vertically. The more pixels that are displayed, the sharper the image will be. The size of the points is the distance between points, expressed in millimeters, such as 25 mm, the smaller the number, the better the image. The refresh rate of CRT monitors, or the response time of LCD monitors, is the speed at which a monitor generates an image. The faster the response time or refresh rate, the better the image.
Generally speaking, LCD monitors take up much less space than a CRT monitor and are lighter. Also, LCD monitors consume less electricity. However, they are usually more expensive, although this can be partially offset in the long term by reduced electricity use.
CRTs typically have higher refresh rates than LCD monitor response times, reducing eye strain and may be preferable for those who spend a lot of time in front of a computer. CRT monitors can be viewed at various resolution settings, while LCD monitors use only one resolution, called the native resolution. This can present a problem for high-end gaming and graphics displays.
While LCD monitors were initially priced higher and lower in quality compared to CRT monitors when they first came out years ago, the technology has improved dramatically and LCD monitors now compare favorably in price and display quality with those. CRT monitors. LCD monitors are the monitors of the future and will eventually make CRT monitors obsolete. For more information on which are the best monitors to buy, click Computer Monitors. There you will find a comparison of the five best all-purpose LCD computer monitors.
No Comment