1.TN-type liquid crystal display due to low technical level, low price, application range of small-size products under 3 inches and can only show black and white monochrome and do some simple text, digital display, mainly used in electronic watches, calculators, simple handheld game consoles and other consumer electronics.

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    2.STN-type liquid crystal display is simpler than TFT-type process, high yield, relatively cheap, for the contrast between strong and screen conversion reaction time faster commodities, so more applied to information processing equipment. If you add a color filter in front of the LCD panel, you can display a variety of colors, even up to the degree of full color. These products are mostly used in the display of text, digital and graphics functions, such as low-grade laptops, handheld computers, stock machines and personal digital assistants (PDAs) and other portable products.


    3. TFT LCD display because the display reaction speed is faster, suitable for animation and video display, so it is widely used in digital cameras, LCD projectors, laptops, desktop LCD monitors. Because it is better than STN-type products in terms of color quality and reaction speed, it is also the mainstream product on the market.


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    The LCD follows a series of rules that are different from CRT displays. THE LCD overcomes the shortcomings of CRT's large size, power consumption and flickering, but also brings problems such as high cost, low viewing angle and unsatisfactory color display. CrT displays can be selected in a range of resolutions and can be adjusted to screen requirements, but LCD screens contain only a fixed number of LCD units and can only be displayed at one resolution (one pixel per unit) on the full screen. The CRT usually has three electronic guns, and the electron stream that is fired must be precisely aggregated or it will not be clearly displayed. However, there is no focus problem with the LCD because each LCD unit is switched on and off separately. That's why the same picture is so clear on the LCD screen. LCD also does not have to worry about refresh frequency and flickering, the LCD unit is either on or off, so the image displayed at a low refresh frequency of 40-60Hz will not flash more than the image displayed at 75Hz. On the other hand, lcd units of LCD screens are prone to defects. For the 1024x768 screen, each pixel consists of three units, responsible for the red, green, and blue display of one unit so a total of about 2.4 million units (1024x768x3 x 2359296). It is difficult to guarantee that all these units are intact. Most likely, some of them have been shorted (with "bright spots") or broken (with "black spots"). Lcd displays contain things that are not used in CRT technology. The light source for the screen is the fluorescent tube that wraps behind it. Sometimes we find unusually bright lines in one part of the screen. There may also be some indecent stripes, a special light color


Comparison of TN, STN and TFT LIQUID CRYSTAL displays