Study On The Key Manufacturing Technology Of Liquid Crystal Display

Liquid Crystal Display(LCD) production is high-tech industry, its manufacturing technology concerns many subjects, such as Chemistry, Physics, Optics, Electronics and Mechanics etc. The manufacturing processes of LCD are very strict with the processes control, equipment, materials and environment etc. In order to solve the difficult problem of LCD manufacturing technology, to promote manufacturing capacity, and to increase the current state of the art and additional production value of LCD, the paper emphasizes on the research of the key manufacturing technology, which are the optical and electrical properties of the ITO(in2O3:Sn) films, the automatic alignment and assembly system of LCD substrate, and the optimized design of LCD parameters.The transmittance and reflectance properties of different sheet resistance ITO films have been researched in this paper. It puts forward the solution to solve the technical problem of the transparent electrode (ITO) shadow. The characteristics of ITO films prior to and post the PI and hot-press heating cure in the manufacturing processes of LCD have been researched to provide guidance for selecting LCD flat panel and enacting of PI and hot-press heating cure conditions in the processes design.To solve the problems of low precision, low effectiveness and too high labor intensity caused by manual operation in the processes of alignment and assembly, the automatic alignment and assembly system of LCD were developed. The paper show the principle and configuration of the system, and present in detail the design idea and technique of its hardware and software as well as the automatic alignment arithmetic and image-processing. The system realized the operation of automatic alignment and assembly of LCD substrate with assembly precision of +10u and assembly speed of 2 pair per minute.The optics propagation characteristics of LCD for realizing static simulation of LCD are calculated and analyzed by 2x2 extended Jones matrix methods. The factors impacting display quality of LCD are discussed and some improved processes control and designing methods are presented too. At the same time, we give a method based on spectral interferometric principle to measure LCD's empty cell gap.