krish Display Devices

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Information about krish Display Devices

Published on November 10, 2010

Author: krish5292


LCD (liquid crystal display) : LCD (liquid crystal display) Liquid crystals were first discovered in 1888, by Austrian botanist Friedrich Reinitzer First experimental LCD by RCA in 1968 Based on properties of polarized light LCD Display : LCD Display A liquid crystal display (LCD) is a thin, flat electronic visual display that uses the light modulating properties of liquid crystals (LCs). LCs do not emit light directly. LCD televisions produced a black and colored image by selectively filtering a white light. The light is typically provided by a series of cold cathode fluorescent lamps (CCFLs) at the back of the screen, although some displays use white or colored LEDs instead Slide 3: LCD Display Technology Liquid-crystal monitors and TVs are transmissive in operation. Their pixels act as shutters to control the amount of light from a fluorescent backlight Current LCD benchmarks include sizes to 82” (prototypes) and brightness exceeding 400 nits FW Power consumption less than plasma for given size Weight less than plasma for given size Slide 4: LCD DISPLAY How LCD works : How LCD works Formed by two glass layers called substrates One is in charge of columns, and the other is in charge of rows Liquid crystals are sandwiched in between these two layers Uses a grid to charge specific pixels When this happens the crystals untwist and allow light to pass through LCD Display : LCD Display LCD High even luminance and no positional drift Long lifetime Small pixel sizes Reduced reflection and sensitivity to ambient light Off-angle viewing is an issue No true black (look at LCD in dark room) LCD Monitors : LCD Monitors Color monitors 1024x768 (15”), 1280x1024 (17,18,19”) or 1600x1200 (20,21”) Gray scale monitors typically 1280x1024 (1Megapixal), 1600x1200 (2Mp clinical) or 2k x 1.5k (3Mp diagnostic) [Mammo 4kx4k CRT] When use portrait (up and down) display, can represent typical CR/DR at almost full resolution on 3 Megapixels On 2Mp monitors, only portions of the image can be displayed at maximal resolution, and have to ‘pan’ to view areas of the image LCD Advantages : LCD Advantages More efficient use of electricity than CRT Produce little glare compared to plasmas Largest screen sizes than other flat panels LCD Disadvantages : LCD Disadvantages Manufacturers often reject about 40% of the panels that come off the assembly line Color contrast is not the best APPLICATIONS : APPLICATIONS computer monitors, television, instrument panels, aircraft cockpit displays, signage, etc. They are also used in video players, gaming devices, clocks, watches, calculators, and telephones.

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