| The application terminal of the Display has been divided into several categories: Medical Display,Vehicle Display,Mobile Display,Civil Computer Display,Virtual Reality Display and Large-size Image Display.Large size displays are mainly for civilian terminals,and the development direction of the technology is Ultra High Definition visual experience and smooth game running pictures.Due to the development of communication technology,the data volume of video signal that would be transmitted has also increased exponentially.At the same time,the demand for high-resolution displays,such as 4K and 8K,has gradually become a hot spot in the market.The design of high definition large size panel will encounter the problems of insufficient driving force,device uniformity and optical uniformity.The research on large-size high-definition panel can not only enhance the product competitiveness of the company,but also have a deeper understanding of the key problems commonly existing in design of the display industry.The touch panel technology makes the interaction between human and machine more smooth,freedom and direct.Compared with mouse and keyboard,the touch operation is more simple and quick.In-cell touch technology is an integrated touch sensing technology in the cell of display screen.In-cell technology integrates the sensor into the liquid crystal box by using the original process of the display panel without affecting the display picture quality.Compare to the other panel,the one which using this technology has thinner appearance and the clearer picture.But the integrated sensor has also caused new problems to panel design.On the one hand the touch sensor take up the area which originally belong to the driving circuit and active area of the display system.On the other hand,the timing of driving system must be changed to make touch and display function working compatibly.The increased function has also increase the RC loading of panel which would cause the serious signal delay,even incorrect driving.The touch sensing also cause the capacitance coupling effect which could influence display image charging.The pixel charging time of large-size highdefinition panel is 1/2 or even 1/4 of the normal resolution panel while the loading difference between the remote and the proximal is large,and the touch areas to be detecting have multiplied.Based on the harsh charging and detection time,the large-size highresolution in-cell touch panel is rarely reported.The goal of the project is to design an in-cell touch GOA circuit that can be used on large-size high-resolution panels.The circuit is based on a-IGZO process and has good touch and display quality,and the high reliability of that is needed.In the early stage of design,the materials and devices characteristics of a-IGZO has been researched.The comparative analysis between IGZO,a-Si and LTPS which is very popular in display manufacture has been made.This paper also makes sufficient research on the panel and touch technology to ensure that the design scheme is the future development direction of the display technology.Through the relevant literature,I have known the problem of the circuit to be developing,and have a better understanding of operation mechanism.In the second half of this paper,a GOA circuit with high robustness is introduced.A 27-inch UHD panel using this circuit is designed.We design the layout of this panel and a demo panel has been made.This panel has been lit and through the reality test.Then the design of in-cell touch GOA has been introduced,especially for two basic GOA circuits.After elaborates the advantages and disadvantages of two scheme,a new in-cell GOA circuit have been designed.The performance of this GOA is verified with Mentor simulation software.The in-cell touch panel with this GOA would have the good touch and display quality. |
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