An LCD TV is a type of flat screen TV that uses LCD (Liquid Crystal Display, liquid crystal display) technology, which generates images using a liquid crystal display. Together with the plasma TV, LCD TV practically has displaced cathode ray tubes CRT TV by low thickness, weight and volume small, low consumption, high definition and widescreen format, despite an image quality and response time less than the CRT. Features currently the flat screen TV, either TV LCD or plasma, practically has displaced market grace cathode ray tubes CRT TVs to its limited thickness, weight and volume small, reduced consumption, high resolution picture and a minor damage in sight, despite a lower image quality and speed of response to the CRT. The LCD TV uses a structure of active matrix TFT (Thin-Film Transistor, thin film Transistor), by what this type of TV is also often referred to as TFT-LCD TV, TFT LCD TV or TV TFT. An LCD TV screen is composed of two layers of tinted glass among which lie the pixels, formed by liquid crystal and divided into three sub-pixels of red, green and blue that generate the color of the pixel. Behind the pixel lies the backlight or light source, which in conventional LCD TV are CCFL (Cold Cathode Fluorescent Lamp, cold cathode fluorescent lamp), while in the so-called LED TV are LEDs (Light-Emitting Diode, light-emitting diode). Let’s look at the main features of an LCD TV: weight and dimensions: LCD TV is light and very flat, with a thickness of less than 10 cm high definition: most can receive high definition HD Ready or Full HD signal. Form factor: most common in LCD TV aspect ratio is widescreen format of 16: 9, unlike the relationship 4: 3 CRT.
Screen size: we can find LCD TV from 15 up to 60 inches in diagonal. Image quality: rate refresh the image, viewing angle, brightness and the delay of an LCD TV provide high image quality. Connections: generally a LCD TV carries all types of connections, both digital (HDMI, DVI) as analogue (SCART, composite video, s-video, VGA). Disadvantages as major disadvantages of LCD TV we can mention: an LCD TV has a native resolution in offers it an optimal result, losing the image quality if you work in another resolution. The range of colors, contrast and image quality is not as good as on a CRT. LCD TV usually has a limited viewing angle. They may have defective transistors that generate stuck pixels (permanently lit), dead (permanently shut down) or weak (less luminosity than the rest). An LCD TV with slow response times can cause ghost images when images are loaded quickly.