![]() When aligned straight, the liquid crystals have no effect on the light’s polarization and the light continues on, as if no liquid crystals existed. It becomes the job of the liquid crystals to alter the angle of polarization of the light, so it to can pass through the second glass substrate, rendering the image. LCDs however, work by aligning the glass substrates perpendicular to each other, causing cross polarization and effectively stopping any light traveling through from the backlight and reaching the front of the display. If the two glass substrates were aligned in the same direction, light would pass right through. Next comes the liquid crystal panel itself, comprising two pieces of polarized glass substrate (polarizing film on glass), with the liquid crystal material interposed between them. Greater contrast ratio, lower power consumption (and therefore cooler operation), greater reliability, and take up less space making the flat panel even slimmer and lighter. LED backlighting offers several advantages over CCFLs. More recent monitors use LED backlighting instead of the more traditional CCFL. This is very important if a high quality display is expected. When cold cathode fluorescent lamps (CCFL) are used as the backlight source, a series of optic sheets are applied that help to evenly disperse and diffuse the light. It is critical that the light from the backlight be distributed over the entire panel. external electrode fluorescent lamps (EEFL).The more common types of backlight light sources are: ![]() In essence, an LCD panel works by blocking or allowing this light to pass from the rear of the panel, through several layers of filters and onto the front of the display, eventually making up the image seen on the LCD screen. Most liquid crystal display panels use a backlight as a light source, since LCDs do not produce or emit their own light. Liquid crystals are an in-between state where the substance is in a permanent liquid state, but with properties inherent in crystal bodies. Solids maintain their shape (crystalline lattice), while liquids flow to take on the shape of their container. ![]() The term liquid crystal refers to the state between solid and liquid of a substance. That’s not to say that compact CRT displays were not available, however they offered nowhere near the compactness (not to mention the low power consumption) of a LCD panel, and certainly could not have been constructed so small and flat as to be used as the display for a wrist watch. ![]() In fact, LCD screens are referred to as flat panel screens compared to the much older and bulkier CRT screens. The liquid crystal display offers a number of key advantages over its predecessor, the cathode ray tube or CRT display, among them reduced power consumption and compact dimensions. ![]() LCDs are very versatile and can be found on electronic watches and clocks, set top boxes, phones, office equipment, scientific and electronic laboratory and field instruments, car dashboards, and LCD televisions and monitors. While not exactly a recent technology, liquid crystal displays or LCD panels are currently the standard display technology used by a wide range of gadgets and devices. In the most basic form, this may be nothing more than an alphanumeric panel to display the date and time, or in the most complex, the rendering of a movie streamed over the internet and displayed on a high definition screen.Īs with all electronic devices and computer systems that evolve over successive generations of technological development, displays too, have become more compact, more energy efficient, and more sophisticated, providing additional and improved features. Almost all electronic devices incorporate some type of visual indication to provide feedback or to represent their current state. ![]()
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