Lcd technology
LCD stands for liquid crystal display. It is a thin, flat electronic visual display that uses the properties of liquid crystals to modulate light. LCDs are used widely in devices like computer monitors, televisions, aircraft displays, and consumer electronics. They were developed in the late 1880s based on the discovery that certain organic compounds exhibited unique optical properties. Each LCD pixel consists of a layer of liquid crystals between two transparent electrodes and two polarizing filters. Pictures are generated by controlling the orientation of crystals to allow red, green, or blue light to pass through at each sub-pixel. Resolution refers to the granularity of the display, while range refers to its total output capabilities. Color performance is described by gamut and depth.
Lcd technology
- 1. LCDLiquid Crystal DisplayPresented ByEhtisham Ali
- 2. What is LCD ?A liquid crystal display (LCD) is a thin, flat electronic visual display that uses the light modulating properties of liquid crystals.They are used in a wide range of applications including: computer monitors, television, instrument panels, aircraft cockpit displays, signage, etc. They are common in consumer devices such as video players, gaming devices, clocks, watches, calculators, and telephones.
- 3. Brief History1888: Friedrich Reinitzer (1858–1927) discovers the liquid crystalline nature of cholesterol extracted from carrots (that is, two melting points and generation of colours) and published his findings at a meeting of the Vienna Chemical Society on May 3, 1888
- 4. LCD TechnologyEach pixel of an LCD typically consists of a layer of molecules aligned between two transparent electrodes, and two polarizing filters, the axes of transmission of which are (in most of the cases) perpendicular to each other
- 5. How pictures are generated ?Comparison of the OLPC XO-1 display (left) with a typical colour LCDExample of how the colours are generated (R-red, G-green and B-blue)Photo showing sub pixels in detail
- 6. Resolution Vs. RangeFundamentally resolution is the granularity (or number of levels) with which a performance feature of the display is divided. Resolution is often confused with range or the total end-to-end output of the display.
- 7. Colour PerformanceThere are many terms to describe colour performance of an LCD. They include colour gamut which is the range of colours that can be displayed and colour depth which is the colour resolution or the resolution or fineness with which the colour range is divided