For high resolution mobile display, UV alignment technology has been getting the technical spotlight at LCD industries. Our IPS-LCD panels with UV alignment technology showed higher contrast ratio since it would prevent rubbing scratch and light leakage in pixel area. And UV aligned IPS sample showed wider viewing angle performance because of their very symmetrical luminance distribution. Especially, our samples showed low gray scale inversion and color shift in a diagonal direction so that one could get more vivid images than rubbed IPS-LCD panel.Author Keywords: UV alignment, Viewing angle, Color shift, Smart display Objectives and BackgroundRecently, the demand in a smart display has been rising strongly to be utilized into a mobile phone or a tablet PC. The annual growth of smart phones and smart books market was expected to increase by 30, 60 respectively in 2010. With some advantages such as the function of wireless Internet and the portable size of these equipments, people can get any desired information regardless of time and place. And to provide much information effectively, high quality of display is required in display field. Especially, to secure good readability, high resolution over 300 ppi and vivid image become essential properties in smart display field. In addition, wide viewing angle without any image distortion is also strongly required in order to enjoy smart display with others.With those requirements in display field, UV alignment technology has been getting the spotlight to achieve high levels of display properties. Even though UV alignment showed various advantages to prevent some drawbacks of rubbing, it has not been applied into the mass production because of a low anchoring energy and strong image sticking [1]. Many approaches have been applied to develop various materials and their irradiation methods for the UV alignment but their technologies had not been produced commercially [2][3][4]. Recently, however, we had been investigated the robust UV alignment materials with quite strong anchoring strength and chemical stability [5]. Azimuthal anchoring strength improved and the serious problem in image sticking was also solved.In this paper, we have discussed the advantages of UV alignment technology for IPS-LCD from the view of panel characteristics. Until now, UV alignment technology has been successfully introduced to enhance the contrast ratio because it would prevent the light leakage from rubbing scratch in the panel.In recent studies, we made the prototype panels for smart displays and it is confirmed that the viewing angle and color shift is enhanced by using UV alignment technology noteworthily. MethodTo verify the prototype panel of UV alignment, we made IPS LCD panels for mobile and tablet PC applications. As an alignment layer, various types of photo-polymer were developed. These polymers could show anisotropic arrangement after linearly polarized ultra-violet (LPUV) light. We controlled the irradiation wavelength, power and energy of LPUV for the alternation of alignment pr...
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