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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 and fluid nature of a picture is a constant challenge for any television and this is how an lcd television does it.

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 inherent properties of a crystal will allow this to occur, as firstly a crystal state is cylindrical in nature and therefore has the ability to allow light to pass through; secondly it has a twisted property which can be accentuated dependant on how much electrical charge is submitted. Increase the current and the crystal will tighten and therefore become more opaque in nature. Reduce the current and it will relax and allow more light to pass through. Do be aware though that the complete restriction of light is impossible as a crystal cannot completely inhibit the transfer of light. Also as each pixel is so tightly arranged to the next, even with polarized glass, you do get a cross contamination from one pixel to another. Resultant issue is an inability to achieve a true real black.

As regards creating colour the pixels are subdivided into three coloured crystals based on the primary colours. The interaction between these red, green and blue crystals produces the lcd televisions colour palette or the lcd tv`s contrast ratio!

The liquid crystals are sandwiched between two pieces of polarized glass ” sometimes described as mother glass. The polarization effect of the glass focuses the light source which is how LCD televisions can achieve such razor sharp images. One of these sheets of glass is coated with a special polymer which secures the thousands of crystals required to create an lcd television display.

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.

An lcd television is a complex piece of equipment, that requires multiple processes to correspond instantaneously. The inability to create a true black is always an issue due to light bleed but with further developments in LED specific pixel lighting technology as opposed to a blanket back light the challenge is on to create the perfect screen.