The LCD screen consists of a number of small pixels that are a layer of molecules. Their arrangement is in between two electrodes, two polarizing filters, and the axes of the transmission that are generally perpendicular to each other. If in this assembly there is a absence of the liquid crystal between the polarizing filters, it will cause the blockage to the light passing through the first filter. This will happen if you place the second polarizer in a crossed position, blocks it. The alignment if of the surfaces is in a single direction. The alignment of the surfaces determines the direction. On the application of the electric field, this screen can display images.

The LCD screens have the following specifications. They evaluate the quality of the LCD screens, from the following factors.

a)Resolution. They express resolution in the pixels. The more he number of the pixels the more is the resolution of the LCD monitor. The expression of the horizontal and the vertical size of the screen in the pixels while giving the resolution. These monitors have a native supported resolution. Due to this resolution, it has a very good display effect.

b)The dot pitch, This is the distance between the centers of the adjacently placed pixels. The screen with smaller value of the dot pitch has greater resolution. This may be same horizontally and the vertically but in some cases they may be different.

c)The viewable size, They express it in the form of the active display area. This consists of a diagonal measurement of the LCD panel size.

d)The time of the response. The lesser the response time the better is the monitor. The response time is the time required for the changing of the color and the brightness of the pixels.

e)The type of the matrix, It may be active of passive.

f) The viewing angle, this is the viewing direction of the screen and they generally call it as the coll.

g)The color available. The number of the colors that it can display also has the name the gamut.

The brightness, they also call it as the luminescence.

h)The contrast ratio. This is the ratio f the intensity of the brightest bright and the darkest dark.

i)the aspect ratio. They also called ratio of the width to the height the aspect ratio.

j)Lastly, the import ports, There a number of input ports like the DVI, VGA, LVDS, and S-Video HDMI..

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