How Does an LCD TV Work?


Basic Structure

  • A Liquid Crystal Display TV is made of two flat sheets of glass. These sheets are treated or "polarized" to allow certain wavelengths of light to pass through while blocking others. Because of this, the sheets are known as substrates. Between the substrates is a liquid crystal solution. A back light is shown through the rear substrate toward the viewer. Molecules of the liquid crystal shift by means of a varying electrical current. This causes them to become transparent in some areas and opaque in others, allowing certain wavelengths to pass through.

How Does an Active Matrix Display LCD TV Work?

  • The Active Matrix Display is the more common of the two types of LCD TVs because of its quick refresh rate. The front substrate is lined with a matrix of transparent, thin film transistors. While the general image is created by the manipulation of the liquid crystal medium, the detail is picked out by an array of pixels layered directly over the matrix. The matrix receives the video signal and switches on the appropriate transistor, which connects with each color pixel across the entire matrix, creating a picture. This configuration of lighted pixels remains the same until the next cycle occurs and a new configuration is sent electronically, creating the next picture. The speed at which this is done is called the refresh rate. Acting at a rate of more than 100 cycles per second, it's three times faster than traditional reel-film projectors.

How Does a Passive Matrix Display LCD TV Work?

  • This type of LCD TV is cheaper and easier to produce as it does not use a matrix of film transistors. Instead, it uses a lattice work of conductive metals to carry the electrical signal charge to the pixels. This method is imprecise as the metals are slower to carry a charge and only able to activate a larger number of pixels in any given area, resulting in a significantly lower resolution.

Related Searches

  • Photo Credit
Promoted By Zergnet


You May Also Like

  • What Is an LCD Backlight?

    LCD stands for liquid crystal display. LCD technology previously appeared in digital watches, calculators and other small electronics before flat screen televisions....

  • How Does an IPS LCD Work?

    In-Plane Switching (IPS) LCD technology has been around since 1996, but it has lately taken the spotlight with the March 2010 release...

  • Why Netflix Won't Work on an LCD

    Netflix is a service that allows you to stream videos online to your computer, video game console and television. However, without the...

  • How Does an LED-Backlit LCD Work?

    A liquid crystal display (LCD) television that is backlit with light-emitting diode (LED) technology is designed to produce a more brilliant picture...

  • How Do I Get My PC Speakers to Work on My LCD TV?

    So you're looking to connect a pair of computer speakers to your television. Televisions are notorious for coming with poor on-board speakers;...

  • Does an LCD TV Ever Burn Out?

    If you were to turn on a brand-new LCD television set right now, and kept it on around the clock, six years...

  • How Does a Wireless Projector Work?

    Whether used in a home, classroom or business setting, wireless projectors reduce the corded clutter in your environment. They are also convenient...

  • Does Displex Scratch Remover Work?

    Displex is a type of display polish designed to effectively remove scratches from plastic LCD displays without damaging the display. The product...

  • How Does a Digital Television Work?

    Digital television works by having a digital antenna connection that programs the digital and analog channels into the TV memory. Find out...

  • How Does a Computer Monitor Work?

    A computer monitor, specifically an LCD monitor, works by pulsing electricity through liquid crystals, which then align themselves to allow light to...

Related Searches

Check It Out

Geek Vs Geek: Robot battles, hoverboard drag race, and more

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!