Liquid Crystal Display is a kind of screen filled with a polarizing fluid between two glass plates. This liquid is an electrically controlled fluid trapped between two transparent polarizing sheets. The polarizing axes of the two sheets are aligned perpendicular to each other. The polarizing liquid is filled in cells which have electrical contacts to permit the entry of electrical field into the cells. When an electric field is applied, the molecules in the liquid align themselves with the field, inhibiting rotation of the polarized light. As the light hits the polarizing sheet perpendicular to the direction of polarization, all the light is absorbed and the cell appears dark.
The whole display has array of segments called Pixels which may be coloured or monochrome or both. The pixels may be divided into Sub pixels of Red, Green, and Blue by additional filters as in the case of LCD TV. These pixels are arranged in front of a light source with a reflector. Each sub pixel can be controlled independently to produce thousands or millions possible colors for each pixel. The liquid crystal makes the light to pass through the other by twisting the polarization of light entering one filter. By applying a small electric charge to transparent electrodes over each pixels or sub pixels, the molecules of the liquid crystal are twisted by electrostatic forces. This reorientation of the liquid crystal makes the image.
LCD screen is too sensitive to mechanical shocks and heat , since the pressure may squeeze the fluid present in between the plates which can cause its permanent damage. Excessive heat can change the physical properties of the liquid so some part of the screen may damage and appear as black spots or segments.
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Quality of image is far better in TFT monitor than the LCD monitor, This is because TFT monitor uses Thin Film Transistor (TFT) technology to enhance the contrast and addressability of the image. It is a variant of the Liquid Crystal Display (LCD) that uses matrix LED technology to provide clarity, brightness etc of the monitor. TFT monitors are now common in TV, Computer, Mobile phone etc.
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An LCD basically consists of two glass plates with some liquid crystal material between them. The LCD has an electrically controlled light polarising liquid trapped in cells between two transparent polarising sheets. The polarising axes of the two sheets are aligned perpendicular to each other. Each cell in the LCD has electrical contacts that permit an electric field into the liquid present inside the LCD cell.
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LCD monitors of PC and Laptop gives best performance and visual attraction when the monitor is set correctly. The OS of the PC or Laptop chooses the best display settings like resolution, colour, refresh rate etc based on the type of LCD screen. The LCD monitor has flat panel display which is thinner and lighter compared to the CRT monitor of PC. LCD monitors come in different screen sizes having a wide screen width-height ratio of 16:9 or 16:10. The standard width model usually has a 4:3 screen ratio. If the settings of the monitor are changed, you can set the various aspects of the LCD monitor to get best performance or you can choose the default settings.
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Electroluminescence is the Optical and Electrical phenomenon in which a material emits light when current passes through it. This phenomenon is entirely different from the emission of light from bulbs and other light emitting devices. It is resulting from the radiative recombination of electrons and holes in a semi conductor material. The excited electrons generate Photons to give light. LEDs and Phosphor displays are typical examples of electroluminescent lighting.
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Thin Film Transistor LCD (TFT-LCD) monitors are now popular in electronics field. It is a variant of the ordinary Liquid Crystal Display (LCD) that uses thin film transistor technology to enhance the quality of image such as contrast and addressability. It is a form of Active matrix LCD used in Computer monitor, Mobile phones, TV etc.
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