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Monday, 9 March 2015

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Simple Wallpaper Biography

Wallpaper is a kind of paper used to cover walls inside of houses and buildings. Wallpaper is used to decorate the inside of buildings instead of paint. It is sold in rolls and are put onto a wall using wallpaper paste. Wallpapers can come either plain (so that it can be painted), or with pictures or patterns.
"Wallpaper" is also a word for a picture on a computer monitor.
Wallpaper was first used in Europe around the year 1500. Wallpaper was made to look like rugs that hang on walls because they were like pictures. Soon after people started making wallpaper, England and France started making a lot of wallpaper. For a while in 1650, wallpaper was not used because the religious leader in England did not like it. However, by 1750 people were using wallpaper all the time and more people got better at making wallpaper.A computer monitor is an electronic device that shows pictures. Monitors often look similar to televisions. The main difference between a monitor and a television is that a monitor does not have a television tuner to change channels. Monitors often have higher display resolution than televisions. A high display resolution makes it easier to see smaller letters and fine graphics.
There are three types of computer displays:
The CRT monitor. These are heavy, use a lot of desk space and electricity. It is the oldest technology used by monitors and is based on the cathode ray tube technology that was developed for television. Monitors are made with better parts which give a much higher display resolution and picture sharpness than a television. This type of monitor is no longer popular.
The LCD monitor, the most common kind of flat panel display. It is a newer technology than CRT. LCD monitors use much less desk space, are lightweight and use less electricity than CRT. They have been used for many years in the screens of laptop and notebook computers. They also work as touch screens in tablet computers, mobile phones, and other handheld technologies.
In the early 21st century the price of video projectors has fallen and they are now used in many places to show large images. These use various technologies to make the image including LCD - Liquid crystal display and DLP - Digital light processing which uses very small mirrors to direct the light.
This short article about technology can be made longer. You can help Wikipedia by adding to it.

A liquid crystal display is a special thin flat panel that can let light go through it, or can block the light. (Unlike an LED it does not produce its own light). The panel is made up of several blocks, and each block can be in any shape. Each block is filled with liquid crystals that can be made clear or solid, by changing the electric current to that block. Liquid crystal displays are often abbreviated LCDs.
Liquid crystal displays are often used in battery-powered devices, such as digital watches, because they use very little electricity. They are also used for flat screen TV's. Many LCDs work well by themselves when there is other light around (like in a lit room, or outside in daylight). For smartphones, computer monitor, TV's and some other purposes, a back-light is built into the product.
Construction[change | change source]

LCD alarm clock
The LCD uses technology called electro-optical modulation. This means it uses electricity to change how much light passes through it.
Each pixel (block) of an LCD is made of a thin layer of molecules between two electrodes and two polarizing filters. The electrodes provide electric power to the liquid crystal layer, and don't block the light. Light travels with 'polarity' or direction, and a polarizing filter only lets light with one kind of polarity to go through it, like trying to slide a ruler through a narrow opening. Only when the ruler is lined up right, will it fit. These two filters are perpendicular to one another, so the narrow openings are in different directions. This means that without the liquid crystals between them, they would block all light from passing through – whatever light gets through the first filter won't fit through the second filter.
The layer of liquid crystals between the two filters can 'twist' the light so that the polarity changes. This means the light can then pass through both filters, and the pixel appears clear. When giving an electric current to the liquid crystals, the molecules will untwist and won't change the light. The filters then block the light and the pixel appears dark.[1]
When a large number of pixels are needed in a display, it becomes difficult to have enough wires and electrodes to control each pixel and still have a clean display. Instead, the display is multiplexed. In a multiplexed display, electrodes on one side of the display are grouped and wired together (usually in columns). On the other side, the electrodes are also grouped (typically in rows), with each group getting a voltage sink. By turning on one row and one column, each pixel can be controlled one at a time.

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