LCD TVs – What You Need To Know Before You Buy

By Michael Hiltone | January 21, 2009

The most popular way of generating an image on any modern day television is by the use of LCD television technology (liquid crystal display).

The ever changing element to a television picture represents challenges for any lcd television manufacturer and if you want to know how it is done, read on.

At the rear of an LCD television is a backlight which shines through the LCD panel. To create the different timbres and contrasts of colour, the LCD panel must be able to restrict the amount of light passing through.

The cylindrical property of a crystal allows light to flow freely through it. The twisted property allows light to be restricted. By passing a current through the crystal this creates a tightening effect which restricts the flow. Therefore increase current for dark pixels; decrease flow for light.

The colour issue is created by sub dividing each pixel with three colour elements/crystals ie red, green and blue (primary colours). The interaction of these three colours creates the colour palette (contrast ratio) of the television.

The matrix of liquid crystals are placed between two pieces of glass which are polarized to focus the light source and give pixel perfect razor sharpness to the proceedings.

The distribution of information through the lcd tv is via a transparent matrix of thin film transistors. This network co ordinates the feed of current through the lcd television panel and thus controls each individual pixel and resultant picture. It must do this rapidly due to the nature of television ie it is constantly moving. This process can be performed upto 100 times a second.

This is an over simplified description of how an LCD works but it does highlight the most important area, as to how the different brightnesss and various colours are achieved. Television manufacturers are currently in development to introduce high performance light emitting diodes which will further focus the brightness and allow greater control over pixels. This more focussed approach will allow a more full disablement of a pixel and help achieve that true black everyone is striving for plus with the use of coloured diodes the colour palette of an lcd television will be further enhanced to achieve even greater subjective contrast ratios.

You’ll never have to worry about lcd and plasma televisions again! Visit us on the web at www.digitaldirect.co.uk to learn more. For your convenience look at these 42 inch lcd and lcd tvs 26

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