Principles
Liquid crystal is a kind of phase state, it is a kind of substance that can flow like a liquid and has some crystal structure characteristics, and has special physical, chemical, and optical properties. The liquid crystal itself does not emit light and does not have any color, but under the influence of voltage, the molecules will be deflected at corresponding angles, and can drive the incident light to be deflected together. This special optical performance has been widely used in the middle of the 20th century. Thin and light LCD display technology.
The structure of the LCD screen is similar to a "sandwich". It consists of layers, membranes, and liquid crystals with different functions. For example, the TFT screen is mainly composed of a fluorescent tube, a light guide plate, a polarizing plate, a filter plate, a glass substrate, an alignment film, and a liquid crystal. Material, thin mode transistor and other components. The liquid crystal is placed between two transparent conductive glass attached to the optical axis vertical polarizer, and the liquid crystal molecules are arranged in order according to the fine groove direction of the alignment film. If the electric field is not formed, the light will be smoothly injected from the polarizing plate, the liquid crystal molecules will rotate the incident light in the direction of travel, and then the light will be emitted from the other side. If the two conductive glasses are energized, an electric field is generated between the glass, which affects the arrangement of the liquid crystal molecules, and the liquid crystal molecular rods are twisted so that the light cannot penetrate, thereby blocking the light source.
The LCD screen must have a backlight. The incident light passes through the polarizer and then passes through the liquid crystal. The alignment of the liquid crystal molecules changes the angle of light passing through the liquid crystal, and then the light passes through the color filter film and the other polarizer. Therefore, by simply changing the voltage value of the stimulating liquid crystal, the intensity and color of the light that finally appears can be controlled, so that a combination of colors having different hues can be changed on the liquid crystal panel.
LCD is also different
The current LCD panel mainly uses TFT (ThinFilmTransistor) technology as the underlying drive technology to achieve high-speed, high-brightness, high-contrast, color reproduction, wide viewing angle display effect, and in the display technology, currently used TN Screens, IPS screens, CPA screens, PVA screens, and MVA screens, of which TN screens are widely used and inexpensive, with the disadvantage of small viewing angles and pseudo-colors, and thus improved TN+film screens. The main difference between these screens is the display details such as contrast, viewing angle, color performance, and reaction speed. It should be said that each has its own strengths. Among them, IPS (hard screen) has a good comprehensive display effect, and has the advantages of high viewing angle, fast response speed, and accurate color reproduction. The disadvantage is that light leakage is serious and the purity of black is not enough.
While various display technologies compete with each other, "LED LCD screens" have been intentionally or unintentionally obscured by the concept and have been marketed as selling points. In fact, LED is the abbreviation of LightEmittingDiode. It can be used as a display unit and has a good performance-to-price ratio. Nowadays, most outdoor advertising screens use LED screens. However, LEDs are used directly as displays. The unit cannot be used in the security industry because its pixels are too large to be displayed in HD at close range. Returning to the recent hot LED liquid crystal display, the display principle is to control the amount of light passing through the liquid crystal as a valve, but it is different from the traditional CCFL (cold cathode fluorescent lamp), which uses the LED as the backlight of the liquid crystal screen. Because the LED backlight can be evenly distributed, it can achieve a good regional dimming, and its backlight color gamut is wider. Compared with the CCFL light source, it has a longer life, low light attenuation, energy saving and environmental protection, and effective elimination of black edges and other visible Advantages, but also to a certain extent, narrow the gap between seams.
It should be noted that although the display effect of the splicing screen largely depends on the quality of the LCD single-screen panel, the merits of the selected splicing screen video solution (DSP) will also directly affect the input video image. Decode to restore picture quality.
Liquid crystal is a kind of phase state, it is a kind of substance that can flow like a liquid and has some crystal structure characteristics, and has special physical, chemical, and optical properties. The liquid crystal itself does not emit light and does not have any color, but under the influence of voltage, the molecules will be deflected at corresponding angles, and can drive the incident light to be deflected together. This special optical performance has been widely used in the middle of the 20th century. Thin and light LCD display technology.
The structure of the LCD screen is similar to a "sandwich". It consists of layers, membranes, and liquid crystals with different functions. For example, the TFT screen is mainly composed of a fluorescent tube, a light guide plate, a polarizing plate, a filter plate, a glass substrate, an alignment film, and a liquid crystal. Material, thin mode transistor and other components. The liquid crystal is placed between two transparent conductive glass attached to the optical axis vertical polarizer, and the liquid crystal molecules are arranged in order according to the fine groove direction of the alignment film. If the electric field is not formed, the light will be smoothly injected from the polarizing plate, the liquid crystal molecules will rotate the incident light in the direction of travel, and then the light will be emitted from the other side. If the two conductive glasses are energized, an electric field is generated between the glass, which affects the arrangement of the liquid crystal molecules, and the liquid crystal molecular rods are twisted so that the light cannot penetrate, thereby blocking the light source.
The LCD screen must have a backlight. The incident light passes through the polarizer and then passes through the liquid crystal. The alignment of the liquid crystal molecules changes the angle of light passing through the liquid crystal, and then the light passes through the color filter film and the other polarizer. Therefore, by simply changing the voltage value of the stimulating liquid crystal, the intensity and color of the light that finally appears can be controlled, so that a combination of colors having different hues can be changed on the liquid crystal panel.
LCD is also different
The current LCD panel mainly uses TFT (ThinFilmTransistor) technology as the underlying drive technology to achieve high-speed, high-brightness, high-contrast, color reproduction, wide viewing angle display effect, and in the display technology, currently used TN Screens, IPS screens, CPA screens, PVA screens, and MVA screens, of which TN screens are widely used and inexpensive, with the disadvantage of small viewing angles and pseudo-colors, and thus improved TN+film screens. The main difference between these screens is the display details such as contrast, viewing angle, color performance, and reaction speed. It should be said that each has its own strengths. Among them, IPS (hard screen) has a good comprehensive display effect, and has the advantages of high viewing angle, fast response speed, and accurate color reproduction. The disadvantage is that light leakage is serious and the purity of black is not enough.
While various display technologies compete with each other, "LED LCD screens" have been intentionally or unintentionally obscured by the concept and have been marketed as selling points. In fact, LED is the abbreviation of LightEmittingDiode. It can be used as a display unit and has a good performance-to-price ratio. Nowadays, most outdoor advertising screens use LED screens. However, LEDs are used directly as displays. The unit cannot be used in the security industry because its pixels are too large to be displayed in HD at close range. Returning to the recent hot LED liquid crystal display, the display principle is to control the amount of light passing through the liquid crystal as a valve, but it is different from the traditional CCFL (cold cathode fluorescent lamp), which uses the LED as the backlight of the liquid crystal screen. Because the LED backlight can be evenly distributed, it can achieve a good regional dimming, and its backlight color gamut is wider. Compared with the CCFL light source, it has a longer life, low light attenuation, energy saving and environmental protection, and effective elimination of black edges and other visible Advantages, but also to a certain extent, narrow the gap between seams.
It should be noted that although the display effect of the splicing screen largely depends on the quality of the LCD single-screen panel, the merits of the selected splicing screen video solution (DSP) will also directly affect the input video image. Decode to restore picture quality.
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