LCD Televisions facts

Lcd Televisions are now the most popular type of television screen and one that is supported by all television manufacturers.

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.

An lcd television has a back light permanently turned on, which is the source of a televisions brightness. To create brightness and darkness it must be able to limit or increase flow of this light.

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.

To create colour in an lcd tv, the pixel has three coloured sub crystals which are made up of the primary colours (red, green, blue). The relationship between these crystals generates the colour and hue of the pixel ie the 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.

Across the whole internal construct of an lcd tv`s panel is a matrix of micro thin transparent transistors. The matrix feeds information via electrical currents to each individual pixel which then controls the feed of information and ultimately the colour and temperature of an individual pixel. This then ultimately creates, over the whole matrix within the lcd television, the image.

As can be seen, to create a final picture, the lcd television needs to perform rapid fire actions on a micro level to create an image on a macro level. This synergy of components is something which is being further refined by lcd television manufacturers and it is still surprising how far television engineers are taking the concept in the strive to make the perfect screen.