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LCD classification
2011-09-12 by seoer
LCD is used as the material of the liquid crystal display. LCD is between the solid and liquid organic compounds between widescreen LCD display panels . It will become transparent liquid heating, cooling will become cloudy crystalline solid. In the electric field, liquid crystal molecules arranged in the change will occur, thus affecting the light through its changes in the light of changes in the role through the polarizer can be expressed as changes in light and shade. In this way, it is ultimately controlled by the electric field control of light and shade variation, so as to achieve the purpose of displaying images. According to the arrangement of liquid crystal mode, the common liquid crystal displays are divided into: a narrow angle of TN-LCD, STN-LCD, DSTN-LCD; wide viewing angle of the IPS, VA, FFS, etc. One TN-LCD, STN-LCD and DSTN-LCD three display the same principle, but the twist angle of liquid crystal molecules is different. TN: Twisted Nematic (Twisted Nematic) liquid crystal molecules twist angle of 90 degrees. STN: Super Twisted Nematic (Super TN) Super is the meaning of S, that is, to increase the twist angle of liquid crystal molecules, was 180 degrees or 270 degrees, so to achieve superior display (due to increased contrast) . DSTN: Double Super Twisted Nematic (Double layer STN). D is the double layer of its double meaning, so some more excellent off than STN. As the DSTN display panel structure has a more complex TN and STN display quality than the more delicate. Wide viewing angle mode, such as flat conversion IPS (In-Plane Switching), VA vertical orientation (Vertical Alignment) 1. TN-type is the most mainstream of the market model used LCD displays, widely used in entry-level and mid-panel. Now common in the performance indicators is not a natural viewing angle color ills. The TN panel on the market to see improved are the TN + film, film, namely, compensation film for viewing angle of TN panels make up less than, say TN panels better than the first two panels of the place, is because of his output gray-scale series are more liquid crystal molecules tilt speed, resulting in easy to improve its response time, currently on the market the following 8ms LCD products are used a TN panel. TN panels in general is very obvious advantages and disadvantages of products, cheap, response time to meet the requirements of the game it's advantages, not the ideal viewing angle and true color performance is a distinct disadvantage. 2. STN and TN-type display principle is similar. The difference is, TN twist nematic field effect of liquid crystal molecules are rotated 90 degrees to the incident light, while the STN super twist nematic field effect is the incident light 180 to 270 degrees. 3.DSTN by double-scan mode to scan twisted nematic liquid crystal display to achieve the complete display purposes. DSTN is a super twisted nematic displays (STN) evolved. As DSTN Dual Scan technology, STN display relatively speaking, has greatly improved. 4 wide viewing angle mode used for LCD TVs. The IPS, for example, it is the Hitachi panel technology introduced in 2001, it is also known as "Super TFT". From a technical point of view, the traditional LCD display liquid crystal molecules are generally in the vertical - to switch between parallel state, MVA and PVA to the improvement of the vertical - two-way tilt switch mode, and IPS technology and the technology is the biggest difference is that, regardless of What state liquid crystal molecules are always parallel to the screen, only power / normal state elements of the rotation direction is different - note, MVA, PVA liquid crystal molecules are rotated space rotation (Z axis), while the IPS liquid crystal molecules belongs to the plane of rotation of the rotation (XY axis). To cope with this structure, IPS requires improved electrode, the electrode did the same side, the formation of plane electric field. This design brings the problem is twofold, one viewing angle problem has been resolved, partly because the marginal effect of the electric field resulting liquid crystal light efficiency is low (light transmittance), the IPS also has the disadvantage of slow response time. 16.7M colors, 178 degree viewing angle and response time of 16ms on behalf of IPS liquid crystal displays are now the highest level. The drive from the LCD panel to points, the most common is TFT (Thin Film Transistor) type drive. It is through the active switch means to achieve the precise control of each pixel independently, so the passive compared to the previous driver (commonly known as pseudo-color) can achieve a more sophisticated display. Thus, most current serial LCD module, LCD TVs and some mobile phones are used TFT driver. LCD multi-mode with a narrow viewing angle of TN LCD TV with wide viewing angle of the IPS and other multi-mode. They are known as TFT-LCD. TFT-LCD consisted mainly of the fluorescent tube (or LED Light Bar), light guide plate, polarizer, filter plates, glass substrate, with the film, liquid crystal materials, thin transistors, and so constitute a pattern. First, the LCD backlight must use projected light, the light will first pass through a polarizer and then through the liquid crystal. Then the arrangement of liquid crystal molecules will change in the transmission of light through liquid crystal polarization angle, then the light must also pass the color filter in front with another piece of polarizing film. So long as we change the voltage on the added value of the LCD can control the intensity of the last occurrence of light and color, so you can change out the LCD panel with different shades of color combination.
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