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COG process; LCD electrode; corrosion

Author:admin Time:2017-08-01

The European Union automation investigation discovered that the profession appears COG craft appears the corrosion phenomenon, mainly has following two kinds:
1, class LCD COG corrosion:
The corrosion of COM electrode occurs at the ITO on the edge of the screen. If it is observed under the microscope, there will be dirt at the site of corrosion.
The ACF corrosion of ACF corrosion, the corrosion phenomenon generally occurs in the control terminal electrode under ACF, and there were no dirt, high voltage V0 and VOUT easily, general is done in high temperature and high humidity power found in the experiment.
Crevice corrosion of crevice electrode, corrosion phenomenon occurs in crevice, and black substance is found in crevice under microscope. The mechanism may be unclean or related to the composition of the cleaning solution.
COG electrode surface corrosion: corrosion on the electrode ITO surface, showing a point of corrosion, other locations are normal, in this position of corrosion can be seen pollutants.
2, COG process corrosion causes:
The OM corrosion belongs to electrochemical corrosion and stress corrosion, electrochemical corrosion is due to different metals have different electrochemical potentials, or the same material but its potential difference, and each potential difference between COM electrodes. Because the COM electrode in LCD need in the process of cutting operation, the cutting process in the event of failure of COM knife electrode caused by crack, stress, corrosion in the environment will appear COM corrosion.
ACF corrosion: electrochemical corrosion and interstitial corrosion. In addition to electrochemical corrosion, interstitial corrosion is the local electrochemical corrosion that occurs in the gap and the surface of the solution. If you want to produce crevice corrosion, there must be a space which is wide enough for liquid entering, but also can make the stagnant liquid flow out, ACF and ITO the location of the contact gap, there are liquid ion pollution after the power corrosion.
Crevice corrosion: glass cracks are not cleaned, leaving water, gap corrosion, electrochemical corrosion.
ITO electrode surface corrosion: point corrosion, ITO surface contamination, resulting in electrochemical corrosion during the charging process. According to the above analysis, according to the theory of corrosion, COG corrosion is produced according to the different side of corrosion were classified, but the basic belong to electrochemical corrosion, the corrosion conditions are: solution, power, pollution, stress. For the control of the COG process, if there is no ITO on the dirt clean, or a solution exists at the electrode, resulting in injury or COG electrode in LCD process, will cause the power LCD show or after a period of time COG corrosion.

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