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Lcd display Liquid Crystal D


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tarix23.06.2016
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LCD display (Liquid Crystal Display)

LCD is a screen whose circuitry can cause individual pixels to be transparent or opaque. The screen itself is transparent and requires some sort of backlight for adequate visibility. They're also impossible to repair, so if more than a few pixels are bad the factory has to dispose of the screen. The most common type of LCD display is called "passive matrix". This type is easier to manufacture, hence cheaper. It's also slower and harder to read due to lower contrast. The better type of LCD is called "active matrix" and has a transistor for each pixel. These displays have a higher contrast and wider viewing angle, but they're more expensive and harder to make.



LCD (Liquid Crystal Display) Panel consists of the four components as shown below:

  1. Backlight module (fluorescent tube)
    Backlight module: Also known as fluorescent tube. Cathode rays send light to light guide panel by means of back-end illumination; light enters diffusion points on light guide panel in total reflection and diffuses light to all corners. At that stage, 40-50% of light penetrates the front of light guide panel, and the non-diffused light enters a reflection panel on the bottom to enter the light guide panel again. The technology today can successfully guide 85-90% of light to be diffused on the front of light guide panel.

  2. Polarizer module
    The disarrayed light on the backlight module is arranged to single direction; the function is similar to polarized coil of CRT.

  3. Glass substrate and thin film transistor (TFT liquid crystal molecules)
    In the early years, , this component is the technical bottleneck for manufacturers due to the high defect rate of incision of thin substrate that contains millions of liquid crystal molecules. The production cost for 3.5 to 4th generation LCD has been lowered with the production line technology. The concept behind it is that electrified liquid crystal molecules create shadow dots in backlight, and form shadow lines, planes, and finally images. IV. Color filter module
    The tint can be adjusted through the electric field intensity of liquid crystal molecules, and the colors are adjusted through color filters. The color scales are created by different filters, and the three primary colors are mixed to create 1.6million pigments.


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