LCD (Liquid Crystal Display) is a media type display that uses liquid crystals as the primary viewer

LCD (Liquid Crystal Display) is a media type display that uses liquid crystals as the primary viewer. LCD is used in various fields, such as in electronic devices, such as televisions, calculators or computer screen. In such a color LCD monitor, there is one point of light to many (pixels) which consists of one liquid crystal as a point of light. Although referred to as points of light, this liquid crystal does not emit light itself.

Light source in an LCD device is a white fluorescent lights at the back of this liquid crystal composition.
Number of points of light that tens of thousands, even millions of these that form the image display. Polar liquid crystals through which electrical current will change because the influence of magnetic field polarization arising and therefore will only allow a few colors while other colors passed filtered.
LCD is the main choice but to screen CRT tube,. LCD has a physical form of a leaner, lighter, and consume less power than CRT. However, LCD has a resolution not as good as CRT. In addition, other things become weakness angle view LCD is its smaller than CRT.
Also if you read the LCD screen in the sunlight, the picture or writing will not be seen clearly.
Through the LCD technology, there is one more screen mass-produced and is currently very popular, ie plasma screen. However, plasma screens also have not considered able to meet the needs of the eyes to read e-book. Until finally found a new technology called OLED.

LCD is used in various fields such as in electronic devices such as televisions, calculators or computer screen. Now dominate the LCD display type for desktop and notebook computers as it requires low power, thin shape, spend a little heat and high resoulusi.

In such a color LCD monitor there are innumerable points of light (pixels) which consists of one liquid crystal as a point of light. Although referred to as points of light, but this liquid crystal does not emit light itself. Light source in an LCD device is a white fluorescent lights at the back of this liquid crystal composition.

Number of points of light that tens of thousands, even millions of these that form the image display. Polar liquid crystals through which electrical current will change because the influence of magnetic field polarization arising and therefore will only allow a few colors while other colors passed filtered.

LCD
Liquid crystal display (English: Liquid Crystal Display) also known as the LCD is a display of media type that uses liquid crystals as the primary viewer. LCD is used in various fields such as in electronic devices such as televisions, calculators or computer screen.

In such a color LCD monitor there are innumerable points of light (pixels) which consists of one liquid crystal as a point of light. Although referred to as points of light, but this liquid crystal does not emit light itself. Light source in an LCD device is a white fluorescent lights at the back of this liquid crystal composition.

Number of points of light that tens of thousands, even millions of these that form the image display. Polar liquid crystals through which electrical current will change because the influence of magnetic field polarization arising and therefore will only allow a few colors while other colors passed filtered.

In Simple LCD (Liquid Crystal Display) consists of two main parts. the backlight and liquid crystals. Backlight itself is the LCD light source that usually consists of 1 to 4 pieces (such tech) fluorescent lamps. The lamp is a white backlight. So how do the LCD can display many colors? This is where the role of liquid crystals. Liquid crystal backlight will filter the light. White light is the order of several hundred light with different colors (if you still remember the lesson of Physics). Several hundred light will be visible if the white light through reflection or refraction ray. Color that will be produced depends on the angle of reflection. So if different angle of reflection so that different colors are produced. By providing electrical voltage to a certain value. Liquid crystals can change the angle. And because the task is a liquid crystal to reflect light from the backlight will light a previously white backlight can turn into many colors. Liquid crystal works like a window curtain. If you want to display the white color liquid crystal will open wide so that the light is white backlight will appear on the screen. But If you want to display the black color. Liquid Crystals will close the meeting as tight, so no backlight is the light through (so the screen will appear black). If you want other colors live show set the angle of reflection liquid crystal.

Contrast Ratio Contrast ratio is the ratio of the light level (brightness) on the position of most black and white. At the time of liquid crystal-tight closed meeting to produce a black color should no backlight light through it. But the reality is still no light can penetrate the backlight of liquid crystal displays that can not properly black. This is one of the LCD shortage. So the greater the contrast ratio the better the LCD also displays the color. the easiest way to
find out how good the LCD Contrast Ratio is a black display on the screen. If the black color tends gray there is still a little light penetrated the backlight of liquid crystal.

Response Time on LCD liquid crystal works by opening and closing like curtains. This lid process happened very quickly (following the movement of images on the screen). That is why there is the term Response Time on LCD. Response Time is the time required to change the position of a sealed liquid crystal (time displays a black color) to the position wide open liquid crystal (white display time). So the faster the response time the better. Slow Response Time will cause distortion called Ghosting or trace images. Usually the fast-moving objects and create an image trail like some square that looks like a square.

Point of View (Viewing Angle) LCD Monitor has a limited perspective when compared to CRT monitors. Figure objects on CRT monitors can be seen clearly from the point of even 180 degrees. But not with the LCD monitor. If we look a little shifted from the LCD then the object image will appear darker or lighter. If you are one who need privacy then this is not a problem because the person beside you can not see what's on your monitor easily. But if you want to see the movie together with friends of course this will be a problem.

How it Works LCD TV
LCD using the main component of liquid crystal. This liquid crystal is not a crystal that really is a liquid, but in between the liquid and solid. He is closer to liquid than solid. To turn it into a truly liquid, it only takes a little heat. He is very sensitive to temperature, which is why the LCD screen on the notebook usually reacts a little strange when the weather is cold or heat.

One feature of liquid crystals is that they are easy to react to electrical current. Liquid crystals are arranged in a way the wrap (twisted) and the call by Twisted Nematics (TN). By providing electrical current to make this liquid crystal windings to release each other in various corners, depending on the amount of electrical current. LCD uses liquid crystals because they can react appropriately to the electrical current that can be used to control the light.

Passive matrix and active matrix

There are two types of LCD used is a passive matrix and active matrix. In the passive matrix, LCD using grid electricity to supply voltage simpler in certain pixels on the screen. This grille is made using two layers called substrates. One substrate to form columns and the others formed a line.

Rows and columns are connected to the IC (Integrated Circuit) that control when the voltage is sent to a particular column or row. These rows and columns intersect to create pixels.

To turn on a pixel, the voltage on the IC sends a particular column and a ground to activate the specific lines. This voltage will then cause the liquid crystals twist to open (untwist) the pixels are.

How a simple passive matrix are amazing, unfortunately this has the disadvantage of low response time is more difficult to control the voltage. This can produce a slow and weak contrast.

In the active matrix LCD using a thin film transistor (TFT). Basically, the TFT transistors and capacitors small. They are arranged in a matrix dilapisan substrate. To activate a particular pixel, the specific lines were lit, and then the voltage delivered to the right column.

Since all the rows and columns intersect is in off condition, only the capacitor at the destination pixels are to receive an electric voltage. This capacitor will be able to keep the charging voltage until the next one. If the right voltage to control the crystal, we can make it untwist the right to produce light.

If all this can be done properly, the LCD will produce a gray scale. We have a lot of LCD TVs that already has 256 brightness levels per pixel.

Disturbance Pixel
To be able to produce a variety of colors, each pixel there are three subpixel consisting of red, green and blue (RGB). Three color combinations will be able to produce 16.8 million colors. For example a screen has a resolution of 1024 × 768 pixels, this means that there are 1024 columns x 768 rows x 3 subpixel, we will get 2,359,296 transistors

If there are problems with these transistors will cause interference pixels / dead pixels. Most active matrix screen has a few pixels on the screen interference. Picture above shows one of the dead pixel or commonly called a dead pixel.

LCD TV specifications. LCD TV specifications is very important to do before you buy, there are some important points in the specifications LCD TV, among others:

Resolution (Resolution)
Is the pixel size (the number of point of view) between the length and width / height screen. Monitor tube (CRT) typically have a size of 800 × 600, 1024 × 768 (standard size) or 1280 × 1024. Usually the ratio of 4:3. As for LCD monitors usually have two types of a similar size to the CRT, while the one with the term Wide Screen. Wide Screen LCD typically has a length x width ratio of 16:9. A common resolution that we encounter is unusual: 1280 × 768, 1360 × 768, 1440 × 900, 1680 × 1050, 1920 × 1080, 1200 and 1920 × 2560 × 1600.

Viewable size
Diagonal screen size. For example LCD 17 "(inch), which means the size of the screen diagonal (lower left corner to the upper right corner) along the 17 inch. Usual size is found for example 15 ", 16", 17 ", 18.5", 19 ", 22" and others.

Response time
When the smallest (minimum) required to change the pixel color from black to white and back to black again (black to black), and there is also a method of gray to white and then into another gray (gray to gray). Value respond this time expressed in milisecond (ms / milli seconds). The smaller the value of response time, in theory the transition image / color will be the faster and defects will display smaller. Although the value of under 10ms difference will not be seen, because of the limited ability of the human eye.

Refresh Rate
The number of images displayed every second of the monitor. Because the pixels on LCD monitors do not use the method of life and death of the frame with each other (as used in the CRT monitor), then the current LCD monitors, the refresh rate value will not affect the appearance of such. Unlike the CRT (usually has a refresh rate of 60 Hz, 75 Hz or 85 Hz), sometimes the view is often flashes (flicker).

LCD can have a refresh rate of more than 100 Hz. In comparison, our television has a refresh rate of 25 Hz (25 images / frames per second).

Viewing Angle (Viewing Direction)
Is the maximum angle value where we can still see the display properly. For example Viewing angle of 160 degrees, so when we look at the screen from the point of maximum or less or 160 degrees, the display still looks good. If more than that, it was not clear view again, sometimes some look quite black. If CRT monitor usually has a higher angle, almost of 180 degrees we can see clearly without any changes.

Contrast Ratio
Is the ratio (the ratio) the intensity of the brightness / white (brightest) and the dark / black color (dark). In general, the higher the value of contrast ratio, the better. But sometimes a single product with others using different methods, so that's not easy to compare. Contrast ratio value of all kinds, for example: 20000:1, 10000:1, 5000:1, 2000:1, 700:1 and others.

Aspect Ratio
Comparison between the length and width / height screen. For example 4:3, 5:4, 16:9 or 16:10. Wide Screen LCD will have a ratio of 16:9 or 16:10. As for the common CRT monitors have a 4:3 ratio.

Input Port
Type / type of cable connection is used, such as DVI, VGA, S-Video, HDMI and more. To CRT Monitors usually use the VGA port. When buying VGA (graphics cards) that only has a DVI port, usually also included an additional connection or a VGA to DVI DVI to VGA in order to remain compatible with existing ports.

Additional
Monitor size sometimes can not serve as a reference in determining the resolution. Size 17 "may have the same maximum resolution with monitor size of 16", for example, both have a resolution of 1360 × 768. Can also monitor or 17 "has a lower value.

Excess LCD monitor
1. Character bright eyes comfortable and free of distortion
LCD monitors tend to be light but pleasant in the eyes. Such character LCD, makes the eyes tired and not comfortable for hours in front of the monitor. Unlike CRT sometimes over bright. LCD monitors are relatively free of distortion and flicker. LCD monitors also have a pretty good contrast. Better image focus and moiré-free.
2. Does not depend on refreshrate
Unlike CRT should use a high refreshrate eyes for comfort, the LCD does not require a Cleaner refreshrate to make eyes comfortable. It's rare that LCD offers a high refreshrate CRT. Some say refreshrate 60Hz at approximately the same LCD at 100Hz CRT.
3. User frendly
On CRT monitors, sometimes we have to adjust the geometry, the size of the vertical, horizontal, etc. to fit the look on display. On the LCD monitor is set on auto option only, must fit on the screen.
4. Low power
Low power is a superior LCD monitor. At the same diagonal size, the consumption of the LCD monitor is only half the power consumption than CRT monitors. LCD monitor compatible with green computing trend to reduce energy use and heat released. Even so, some users still do not feel the energy efficiency of LCD monitors than CRT, except for use in large quantities.
5. The compact size, lighter and cooler


Lack of LCD monitors
1. Limited viewing angle, color depth and gradation of colors is limited less
Each LCD monitor has a viewing angle or viewpoint different. But the viewing angle is not as flexible CRT monitors. CRT monitors can be viewed from different angles and sides, not the LCD monitor. Color depth is also limited to LCD monitors, LCD can only display 16.2 million colors RGB. The difference is the color depth is felt when used for playing games or watching high resolution video. In addition, the gradation of color on the LCD monitor is less good, although in everyday use is not felt but less suitable for graphic design and editing photos / video.
2. Display pictures good only in its native resolution
LCD monitor has a native resolution or the term innate resolution to display a good image. If the resolution is set above native, the image will appear broken. If the resolution is set below native, then the resulting image tends to blur and not sharp. This does not happen on CRT monitors.
3. Response time and Ghosting
On the LCD monitor, there is the term response time or response time monitor. The slow response time Ghosting effect is due to late respond monitor image display, so the picture looks a moving shadow. The smaller the value of response time, the better and faster respond. Ghosting effects can still be seen on the LCD monitor with 2 ms response time though. This was seen when used to play games that have a high ability.
4. Color is less accurate
designer or photo editor tend to choose LCD over CRT monitors. Because the color LCD monitor that displayed different from the original sometimes. To be more accurate, should be the color calibration colorimeter with such devices that cost is not cheap. However, in general this does not seem to use everyday.
5. The price is more expensive, extra care needs to be careful and dead pixels