LCD liquid crystal display measurement solution
Measurement and Application of LCD Liquid Crystal Display Screens
Unikang Technology Co., LTD
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01 The development overview and current situation of liquid crystal display technology 02 What is a liquid crystal display? 03 The manufacturing of LCD boxes 04 Why measure the LCD box? 05 The user group of domestic manufacturers in the liquid crystal panel industry 06 Industry measurement and solutions 01 Liquid crystal was discovered by the Austrian botanist F.Reinitzer in 1888, and research on it was once very popular in the 1930s. Later, it lost people's attention because it was not applied. Research on the application of liquid crystals began in the 1960s. G.h. Heilmeier of the Radio Corporation of America (RCA) discovered that the transparent thin layer of nematic liquid crystals would become cloudy when electrified (i.e., the electro-optic effect) and utilized the unique properties of liquid crystal optics to measure temperature and pressure, which were subsequently applied to display devices. The dynamic scattering mode (DSM) discovered by American scientist G.H.Heilmeir has strongly promoted the development of liquid crystal displays (LCD). Since then, many researchers have been dedicated to finding new liquid crystal display modes and striving to improve their performance. In the 1970s, the guest host (GH) mode, phase change (PC) mode and electrically controlled birefringence (ECB) mode emerged one after another. Taking this as a turning point, research on liquid crystals has become active again. LCD(liquid crystal display) reached the substantive practical stage around 1980. As applications such as numbers, text, graphics, and TV picture display have permeated most fields of production and consumption. 02 A liquid crystal display (LCD) is a liquid crystal box made of two conductive glass pieces on the top and bottom. The manufacturing process of the liquid crystal box has strict technical requirements, and the box-making technology is one of the key technologies in manufacturing LCD. A liquid crystal cell is composed of two glass substrates a few micrometers apart. On the inner surface of these glass substrates, there is a transparent electrode of indium tin oxide (ITO) or indium oxide (In2O3). Liquid crystal material is filled between the two substrates. By appropriately treating the electrode surface, the orientation of the liquid crystal molecules is made into a certain state. 03 The manufacturing of LCD boxes is carried out in a clean room environment. In terms of process, it can be roughly divided into cleaning and drying, photolithography, orientation and arrangement, box making, cutting, liquid crystal filling, visual inspection, electrical inspection, surface mount technology, wire mounting, packaging and other procedures. Among them, the production line from cleaning to liquid crystal filling is also called the pre-process, and the production line from visual inspection to packaging is also called the post-process. In the entire process, the crucial step that determines the performance and quality of the device is the formation of the liquid crystal molecular orientation layer. 04 During the manufacturing process of liquid crystal displays, the thickness and size of the liquid crystal cell are generally strictly selected to ensure that the thickness of the liquid crystal layer meets the design requirements and guarantee the realization of the specific display mode required by the liquid crystal display. Specifically, the influence of the thickness of the liquid crystal cell on the performance of the liquid crystal display is mainly reflected in the following two aspects: First Tutorial To achieve high contrast, high brightness and high response speed display effects, the precision of the box thickness of liquid crystal displays is controlled below 0.1μm. Especially for color super-twisted nematic liquid crystal displays (CSTN-LCD), the precision requirement for the box thickness is even higher, generally controlled below ±0.05μm. Second Tutorial The uniformity of the thickness of the LCD display box also plays a crucial role in the uniformity of its display. If the thickness of the box is uneven, it will cause changes in the background color of the LCD monitor, resulting in color waste. Especially in the manufacturing process of color super-twisted nematic LCD monitors, the uniformity of the LCD box thickness is required to be even higher. One of the keys to this technology is to precisely control the thickness of the LCD box. 05 06 Match the product model Filmetrics F20-UV Film Thickness Measuring instrument Measurement principle Light of different wavelengths will be reflected at the top and bottom of the film, and the total amount of reflected light is the superposition of the reflected light from these two parts. Due to the wave-like nature of light, these two parts of reflected light may interfere with each other to be complementary (adding intensity) or cancel each other out (subtracting intensity), depending on their phase relationship. The phase relationship depends on the optical path difference of the reflected light from these two parts, which is determined by the thickness of the film, the optical constant, and the wavelength of the light. Measurement parameters Actual measurement data Real box measurement -Cell Gap Empty box measurement -Air Cell Gap ITO thin film measurement PI层厚度测量 Case studies of equipment installation site The author of this article Yuan Haoqiang Sales Manager of South China Region With nearly 10 years of experience in the film measurement industry, I have extensive application experience in the panel industry. We have helped clients such as Nanshan Glass and HKC solve difficult problems in measurement through customized renovations. Do your best today, and perhaps you will do even better tomorrow. We have been deeply involved in the film measurement industry for over a decade. No matter what problems you have in film measurement, our technical experts can provide you with valuable advice or solutions. Welcome to call us. We are very glad to discuss your application issues with you. Consultation hotline: 400-186-8882 E-mail: info@unicorn-tech.com Unikang Technology Co., LTD Yiying Technology (Shanghai) Co., LTD
