Measurement and Application of LCD Display Screen
Younikon Technology Co., Ltd
catalogue
01 Development Overview and Current Status of Liquid Crystal Display Technology 02 What is a LCD monitor? 03 Manufacturing of LCD Box 04 Why measure LCD boxes? 05 User group of domestic manufacturers in the LCD panel industry 06 Industry Measurement and Solutions 01 Liquid crystal was discovered by Austrian botanist F. Reinitzer in 1888, and research on it was popular in the 1930s. Later, it lost people's attention due to the lack of application. The research on the application of liquid crystals began in the 1960s when G.H. Heilmeier of the Radio Corporation of America (RCA) discovered that the transparent thin layer of nematic liquid crystals would exhibit turbidity (i.e. electro-optic effect) when electrified, and used the specific 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 greatly promoted the development of liquid crystal displays (LCDs). Since then, many researchers have devoted themselves to finding new liquid crystal display modes and striving to improve their performance. In the 1970s, guest host (GH) mode, phase transition (PC) mode, and electrically controlled birefringence (ECB) mode emerged successively. Taking this as a turning point, research on liquid crystals has once again become active. LCD (liquid crystal display) reached a substantial practical stage around 1980. As applications such as numbers, text, graphics, and television displays, they have penetrated into most fields of production and consumption. 02 A liquid crystal display is a liquid crystal cell made of two conductive glass sheets, with strict technical requirements for the production process. Box making technology is one of the key technologies for manufacturing liquid crystal displays. A liquid crystal cell is composed of two glass substrates separated by a few microns. There is a layer of indium tin oxide (ITO) or indium oxide (In2O3) transparent electrode on the inner surface of these glass substrates. Liquid crystal material is filled between the two substrates, and the orientation of liquid crystal molecules is adjusted to a certain state by appropriate treatment of the electrode surface. 03 The manufacturing of liquid crystal cells is carried out in a clean room environment, and can be roughly divided into processes such as cleaning and drying, photolithography, orientation and alignment, box making, cutting, liquid crystal infusion, visual inspection, electrical measurement, surface mounting, lead up, packaging, etc. The production line from cleaning to liquid crystal infusion is also known as the pre process, and the production line from visual inspection to packaging is also known as the post process. The formation of the liquid crystal molecular orientation layer is an important step in determining the performance and quality of the device throughout the entire process. 04 In the manufacturing process of liquid crystal displays, the thickness and size of the liquid crystal cell generally need to be strictly selected in order to ensure that the thickness of the liquid crystal layer meets the design requirements and to achieve 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 In order to achieve high contrast, high brightness, and high response speed display effects, the accuracy of the LCD display box thickness is controlled below 0.1 μ m, especially for color super twisted nematic liquid crystal displays (CSTN-LCD), which require higher accuracy of the box thickness, generally controlled below ± 0.05 μ m. second tutorial The uniformity of LCD display box thickness also plays a crucial role in its display uniformity. If the box thickness is uneven, it will cause changes in the background color of the LCD display, resulting in color waste, especially in the manufacturing process of color ultra twisted nematic LCD displays, where higher requirements are placed on the uniformity of the LCD box thickness. One of the key technologies is to accurately control the thickness of the LCD box. 05 06 Match product model Filmetrics F20-UV film thickness measuring instrument Measuring principle Light of different wavelengths will be reflected at the top and bottom of the film, and the total reflected light amount is the superposition of these two parts of reflected light. Due to the wave nature of light, these two parts of reflected light may interfere with constructive interference (intensity addition) or destructive interference (intensity subtraction), depending on their phase relationship. The phase relationship depends on the optical path difference between these two parts of the reflected light, 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 Equipment installation site case The author of this article Yuan Haoqiang Sales Manager, South China I have been working in the thin film measurement industry for nearly 10 years and have extensive experience in the application of the panel industry. Previously helped customers such as Southern Glass and HKC solve difficult measurement problems through customized modifications. Do your best today and perhaps you can do even better tomorrow. We have been deeply involved in the thin film measurement industry for over ten years. No matter what problems you have in thin film measurement, our technical experts can provide you with valuable advice or solutions. Welcome to call, we are pleased to discuss your application issues with you. Consultation hotline: 400-186-8882 E-mail info@unicorn-tech.com Younikon Technology Co., Ltd Yiying Technology (Shanghai) Co., Ltd
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