LCD Screen Technology

The beauty of LCD TV lies in its sharp, and clear picture. In contrast to Plasma TV, LCD technology provides a very high brightness that many may prefer.

The extremely simplest way to understand the principle of the LCD Display Panel is to imagine a vast amount of coloured pixels sandwiched between glass panels and having a bright light shining from behind at various angles.

If only it was that simple. The glass substrate of LCD panels are intricately made up of many thousands of transitors in vertical and horizontal rows. In fact every pixel is a high performance component on its own.
On a slighly more technical basis the LCD panel is either based on Passive or Active-matrix technology. Concentrating on TV applications, the Active-matrix LCDs depend on thin film transistors (TFT).

Basically, TFTs are tiny switching transistors and capacitors. They are arranged in a matrix on a glass substrate. To address a particular pixel, the proper row is switched on, and then a charge is sent down the correct column.

Since all of the other rows that the column intersects are turned off, only the capacitor at the designated pixel receives a charge.

The capacitor is able to hold the charge until the next refresh cycle. And if we carefully control the amount of voltage supplied to a crystal, we can make it untwist only enough to allow some light through.

By doing this in very exact, very small increments, LCDs can create a grey scale. Most displays today offer 256 levels of brightness per pixel.

 

Cut-Away of LCD Screen

LCD Cut Away

 

QUALITY IS DEPENDENT ON MANY MANUFACTURING PROCESSES OF THE ACTUAL LCD LAYER ALONG WITH THE BACKLIGHTING PRINCIPLES USED AND THE COMPLEXITY AND VARIATION OF FILTERS?

LED BACKLIGHTING HAS NOW BECOME THE GENERAL METHOD

Take a look at a manufacturer who supplies a variety of Filters to the LCD market:-  http://solutions.3m.com/wps/portal/3M/en_US/Vikuiti1/BrandProducts/secondary/optics101/