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Many people know the characteristics of TFT LCD screens, but do you know what are the characteristics of TFT LCD screen materials? Today, I will tell you about the characteristics of TFT LCD screen materials OLED Display Module.

With the rapid development of film transistor TFT array driving liquid crystal display technology, in recent years, TFT screens have not only occupied the high-end display market such as portable notebook computers, but also challenged desktop displays with the improvement of manufacturing processes and the reduction of costs. . Because the film transistor array directly drives the liquid crystal molecules, the cross-distortion effect is eliminated, and the display information capacity is large; using low-viscosity liquid crystal materials, the response speed is greatly improved, which can meet the needs of video image display. Therefore, compared with TFT display screens, TN-type and STN-type liquid crystal displays have made a qualitative leap, becoming one of the most promising display technologies in the 21st century LCD Display Module.

TFT LCD screen material characteristics:

TFT also uses the TN-type electro-optic effect principle, but the TFT liquid crystal material is different from the traditional liquid crystal material 0.42-1.3 inch OLED. In addition to good physical and chemical stability and a wide operating temperature range, TFT liquid crystal materials must also have the following characteristics:

(1) The viscosity is low, and the viscosity should be less than 35 mPa 8226/s at 20°C to meet the needs of rapid response;

(2) Low threshold voltage (Vth) to achieve low voltage drive and reduce power consumption;

(3) High voltage holding rate (V.H.R), that is, the LCD material must have a higher resistivity, generally at least greater than 1012Ω826cm;

(4) The optical anisotropy (△n) is matched with TFT to eliminate the rainbow effect and obtain larger contrast and wide-angle field of view. The range of △n should be between 0.07~0.11.

At present, among the liquid crystal display materials, TN-LCD has gradually entered a period of decline, market demand is gradually shrinking, production capacity is excessive, price competition is fierce, and there is no investment value. STN-LCD screens will gradually enter a mature period, market demand will grow steadily, and production technology will be fully mature. TFT-LCD displays are entering a new round of rapid growth around the world, and market demand will increase sharply, and it is expected to become one of the most promising display materials in the 21st century PM OLED.

Although the liquid crystal materials whose end groups are cyano groups, such as biphenyl and phenylcyclohexane liquid crystals, have been widely used in TN and STN liquid crystal displays, their viscosity is compared with that of fluorinated liquid crystals with the same molecular structure. Still relatively high, these unfavorable factors limit the application of such compounds in TFT liquid crystal displays. The ester liquid crystal has the characteristics of simple synthesis method, wide variety, and wide phase transition range, but its high viscosity greatly reduces the amount used in the TFT formulation. Therefore, the development of new liquid crystal compounds that meet the above requirements has become the focus of liquid crystal chemistry research.

in conclusion:

Liquid crystal materials have developed rapidly with the development of liquid crystal devices, from bifennitriles, esters, oxygen-containing heterocyclic benzenes, pyrimidine ring liquid crystal compounds to cyclohexyl (bi)phenyls, diphenyl acetylenes, and ethyl Bridge bonds and various fluorine-containing aromatic ring-based liquid crystal compounds. Recently, a structurally stable vinylidene fluoride liquid crystal compound has been synthesized in Japan. Its molecular structure is becoming more and more stable, and it continues to meet the performance requirements of STN and TFT liquid crystal screens. The world’s liquid crystal display market is getting bigger and bigger, but my country’s liquid crystal industry has a small share, and it is concentrated in TN liquid crystal materials. There has been certain development in TFT liquid crystal materials, but it is currently not competitive in the world liquid crystal market. Strongly call on the country to take active measures to strengthen the talent and capital investment in the research and development of liquid crystal display devices and materials, tilt upstream in the flat panel display industry, and revitalize the Chinese liquid crystal display industry.