LCD failure evaluation methods and application to effect of dc drive

Lu Lu; Aman Alagh; Philip J. Bos

doi:10.1117/12.893608

7 September 2011 LCD failure evaluation methods and application to effect of dc drive

Lu Lu, Aman Alagh, Philip J. Bos

Proceedings Volume 8114, Liquid Crystals XV; 811416 (2011) https://doi.org/10.1117/12.893608
Event: SPIE Photonic Devices + Applications, 2011, San Diego, California, United States

Abstract

In this paper, we first investigated the degradation of the performance of liquid crystals display (LCD) units after driving by a DC bias. Missed segments were found in the test LCD units. By carefully investigating the alignment layer and ITO layer separately, an explanation of the ITO failure is proposed: voltages applied to the liquid crystal cell causes accumulation of charged impurities or ions, resulting in a decomposition reaction of ITO in regions where segment and common planes overlap and there are scratches on the PI layer. Consequent, missing segments in the corresponding regions is generated. To prevent this kind of degradation, we studied the correlation between the alignment layer and ions adsorption. Both organic alignment layer (PI2555, SE1211, and FPI) and inorganic alignment layer (SiOx, SiO2, and Al203) are analyzed by residual DC and voltage holding ratio measurement. A correlation between ion adsorption and the dielectric constant of the alignment layer is demonstrated. Alignment layer with a smaller dielectric constant is good for reducing ion adsorption in the alignment layer. Alignment layer with a bigger dielectric constant is good for reducing mobile ions in the LC device, and could be used in non-active areas of the liquid crystal device to remove ion from the active area.

Citation Download Citation

Lu Lu, Aman Alagh, and Philip J. Bos "LCD failure evaluation methods and application to effect of dc drive", Proc. SPIE 8114, Liquid Crystals XV, 811416 (7 September 2011); https://doi.org/10.1117/12.893608

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available