Abstract
Currently, the polyethlene terephthalate (PET) film challenges to substitute Tri-acetyl cellulouse (TAC) film which is a protection film in a polarizer layer, because of low cost of PET film. On the contrary, the PET film shows an optical problem such that color shift or interference optical pattern in oblique direction can occur because the film is made with the lamination process, which induces high phase retardation. In this paper, we propose a color shift free low cost polarizer by polymerization of random oriented reactive mesogen (RM) on the PET film. We calculate the viewing angle performance of the polarizer with the conventional PET film, with the TAC film and with the proposed PET film. As a result, we confirm that the proposed optical configuration can satisfy the optical performance equivalent to that of conventional TAC film uses in addition to the cost-down.
Highlights
In modern display devices, liquid crystal display (LCD) became one of the most important display devices
Performance of image quality of the LCD is rapidly improving by applying the advanced mode LC modes, instead of conventional twisted nematic (TN) [1, 2], such as in-plane switching (IPS) [3,4,5], fringe field switching (FFS) [6,7,8], polymer stabilized vertical alignment (PS-VA) [9,10,11,12,13], photo-aligned UV vertical alignment [14]
The polarizer is made of polyvinyl alcohol (PVA) with stretching and dying process so that protection films are required at one side of the PVA film
Summary
Liquid crystal display (LCD) became one of the most important display devices. Considering materials cost of LCDs, a polarizer is one of the most expensive optical components [18,19,20]. The PET film can exhibit high retardation in process of stretching, so that this could make an optical performance such as color shift and narrow viewing angle deteriorate because light from backlight can be polarized due to use of the dual brightness enhancement film (DBEF) in the backlight module and linearly polarized light coming from the top PVA film in LCD could make interference pattern in oblique viewing direction. In this paper we propose an enhanced polarizer which applies the low cost PET protection film with polymerized reactive mesogen (RM) layer with its optic axis in random orientation. The proposed polarizer exhibits low cost characteristic and high optical performance, simultaneously
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