Lcd Televisions are now the most popular type of television screen and one that is supported by all television manufacturers.
The nature of a television image is that it is constantly changing both in colour and in contrast.
To create different levels of brightness and contrast there must be a mechanism to enable and restrict the amount of light passing through the lcd television. All LCD televisions have at the back of the appliance a backlight.
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.
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 lcd television panel is made up of two polarized pieces of glass called mother glass. They are polarized to create further focus for each individual pixel to give razor sharp accuracy as well as create separation between pixels. The internal of one of the sheets of glass is polymer coated to secure the many crystals required in any modern day lcd tv.
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.
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.
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