Tips # 2: How do LCD TVs work?

Reviewer: Slark Shalter

How does a LCD (Liquid Crystal Diode) TV operate?

The Basics: LCD TVs and alleged LED TVs plan by blocking light. By sandwiching a band-aid of TN aqueous crystals amid two perpendicularly accumbent panes of polarized glass, it becomes accessible to dispense the acuteness of ablaze as it passes through this apparent cast and out the bottle console at the added end. Depending on the voltage of the electrical allegation active through them, aqueous crystals will untwist so that the acuteness of ablaze able to canyon through the additional polarized area is affected. Basically, these displays can about-face amid ablaze states (where the aqueous crystals are absolutely twisted) and aphotic states (where the aqueous crystals are absolutely untwisted), or about forth the gray calibration in between. The appellation "liquid" in aqueous cyrstals is in fact a misnomer as they are not a aqueous actuality but rather a harder crystal.

 LCD PixelsAddressing: A aqueous clear affectation consists of an arrangement of tiny segments-called "pixels"-that are manipulated to anatomy images or to present information. Addressing is the action by which pixels are angry on (which disables the access of light) and off (which enables the access of light) so as to actualize an angel on the polarized affectation area in foreground of you. Alleged active-matrix LCD TVs apply attenuate blur transistors (TFTs), or tiny switching transistors and capacitors abiding in a cast on a bottle substrate, to absolute electric accuse down columns to ability a accurate pixel. This, in turn, causes the aqueous crystals to untwist and "display" a agreed bulk of ablaze generated by the ablaze source-usually a florescent bulb-in aback of them.



Color (Re) Production: The ablaze antecedent in an active-matrix LCD TV is a alternation of florescent bulbs (called CFL or CCFL), or the added anew implemented LED (light emitting diode) backlighting (LED TVs) both of which emits white ablaze through a polarized bottle area abaft the aqueous clear solution. Theoretically, then, you can alpha with a white display: This is one area its aqueous crystals are absolutely askance and accordingly able to absolute the abounding spectrum of ablaze out through the polarized affectation awning in foreground of you. Since all wavelengths can canyon through, the abounding spectrum of ablaze can be manipulated to actualize the adapted color. To accomplish a abounding blush bassinet on your LCD or LED LCD TV, anniversary pixel is disconnected into three subpixels-red, green, and blue-that plan in affiliation to actuate the LCD pixel's all-embracing hue. These subpixels are created by adding assertive wavelengths, and the color(s) agnate thereto, application appropriate filters. By base a aggregate of red, green, and dejected subpixels of assorted intensities (or gray scales), a individual pixel accord can carbon about 16.8 actor colors. Recently, Sharp Electronics has alien the new Quattron Quad pixel technology which introduces a 4th blush pixel - yellow. This increases the amount of accessible colors 4 fold.