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Feature Resolution Of LCD Monitors In The Market by jon crain

A display technology that uses rod shaped molecules (that flow like liquid and bend light is called as LCD. On Energized, the crystals direct light through two polarizing filters, showing a natural background color.

When energized, the crystals redirect the light to be absorbed in one of the polarizers, causing the dark appearance of crossed polarizers to show. The contrast and viewing angle improve as the molecules are twisted further. Important factors to consider when evaluating LCD monitor:

Resolution: The horizontal and vertical size expressed in pixels (e.g., 1024x768). Unlike monochrome CRT monitors, LCD monitors have a native supported resolution for best display effect.

Dot pitch: The distance between the centers of two adjacent pixels. The smaller the dot pitch size, the less granularity is present, resulting in a sharper image. Dot pitch may be the same both vertically and horizontally, or different (less common).

Viewable size: The size of an LCD panel measured on the diagonal (more specifically known as active display area).

Response time: The minimum time necessary to change a pixel's color or brightness. Response time is also divided into rise and fall time. For LCD Monitors, this is measured in btb (black to black) or gtg (gray to gray). These different types of measurements make comparison difficult.

Refresh rate: The number of times per second in which the monitor draws the data it is being given. A refresh rate that is too low can cause flickering and will be more noticeable on larger monitors. Many high end LCD televisions now have a 120 Hz refresh rate.

This allows for less distortion when movies filmed at 24 frames per second (fps) are viewed due to the elimination of telecine (3:2 pulldown). The rate of 120 was chosen as the least common multiple of 24 fps (cinema) and 30 fps (TV).Matrix type: Active TFT or Passive.

Twisted nematic (TN): Twisted nematic displays contain liquid crystal elements which twist and untwist at varying degrees to allow light to pass through. When no voltage is applied to a TN liquid crystal cell, the light is polarized to pass through the cell.

In proportion to the voltage applied, the LC cells twist up to 90 degrees changing the polarization and blocking the light's path. By properly adjusting the level of the voltage almost any grey level or transmission can be achieved.

In plane switching (IPS): In plane switching is an LCD technology which aligns the liquid crystal cells in a horizontal direction. In this method, the electrical field is applied through each end of the crystal, but this requires two transistors for each pixel instead of the single transistor needed for a standard thin film transistor (TFT) display.

This result in blocking more transmission area, thus requiring a brighter backlight, which will consume more power, making this type of display less desirable for notebook computers.

Vertical alignment (VA): Vertical alignment displays are a form of LC displays in which the liquid crystal material naturally exists in a horizontal state removing the need for extra transistors (as in IPS). When no voltage is applied the liquid crystal cell, it remains perpendicular to the substrate creating a black display.

When voltage is applied, the liquid crystal cells shift to a horizontal position, parallel to the substrate, allowing light to pass through and create a white display. VA liquid crystal displays provide some of the same advantages as IPS panels, particularly an improved viewing angle and improved black level.

Its hard to deny what you can see with your own eyes even when you are sitting at a newest S PVA matrix with a specified contrast of 1000:1.The specified contrast is usually measured by the LCD matrix maker rather than by the manufacturer of the monitor.

It is measured on a special tested by applying a certain signal and at a certain level of back light brightness. The contrast ratio is the ratio of white to black. Strangely enough, it doesnt mean we have to wait for LCD monitors with a response of 1 or 0.5 or less milliseconds.

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Article Source: http://www.earticlesonline.com/Article/Feature-Resolution-Of-LCD-Monitors-In-The-Market/465092

When 2 polarizing filters are put on top of each other an rotated 90 degrees, what happens and why?

But what's really weird is that if you put a third Polarizing Filter in between the other two at a 45 degree angle, some of the light gets through!

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