Large-screen television technology

As a rule of thumb, the viewing distance should be roughly two to three times the screen size for standard definition (SD) displays.

[1][2][3][4][5] The following are important factors for evaluating television displays: A pixel on an LCD consists of multiple layers of components: two polarizing filters, two glass plates with electrodes, and liquid crystal molecules.

The electrodes are treated with a layer of polymer to control the alignment of liquid crystal molecules in a particular direction.

This filter will block the passage of light because of the difference in polarity orientation, and the resulting pixel will be black.

These circuits send charge down the appropriate row and column, effectively applying a voltage across the electrodes at a given pixel.

Simple LCDs such as those on digital watches can operate on what is called a passive-matrix structure, in which each pixel is addressed one at a time.

Each transistor also acts as a capacitor while leaking very little current, so it can effectively store the charge while the display is being refreshed.

These ionized gas atoms, or plasmas, then release ultraviolet photons that interact with a phosphor material on the inside wall of the cell.

The control circuitry can manipulate the intensity of light emitted from each cell, and therefore can produce a large gamut of colors.

The projector uses a bright beam of light and a lens system to project the image to a much larger size.

The following are different types of rear-projection televisions, which differ based on the type of projector and how the image (before projection) is created: In Laser Phosphor Display technology, first demonstrated in June 2010 at InfoComm, the image is provided by the use of lasers, which are located on the back of the television, reflected off a rapidly moving bank of mirrors to excite pixels on the television screen in a similar way to cathode-ray tubes.

The small layers of phosphors inside the glass emit red, green or blue light when excited by a soft UV laser.

The laser can be varied in intensity or completely turned on or off without a problem, which means that a dark display would need less power to project its images.