Abstract
Conventional transflective liquid crystal displays (LCDs) with single cell-gap requires optical compensation films or patterned retarders to balance the optical path-length difference between transmissive and reflective regions. In this paper, novel single cell-gap transflective LCDs driven by fringe electric field without using the compensation film or in-cell retarder have been proposed. The liquid crystal director is aligned parallel to analyzer but makes an angle of 45° with respect to analyzer in reflective region. In addition, the surface pretilt angle in the reflective region is controlled by vertical field and polymerization of an UV curable reactive mesogen at the same time and thus, the effective cell retardation in the reflective region becomes smaller than that in transmissive region. Consequently, without using any compensation film or in-cell retarder, the single cell-gap and single-gamma transflective LCD with high performance is realized.
Highlights
Sunlight readability becomes a critical issue in image quality of liquid crystal displays (LCDs) because portable LCDs and public information displays are widely used nowadays
Novel single cell-gap transflective LCDs driven by fringe electric field without using the compensation film or in-cell retarder have been proposed
The liquid crystal director is aligned parallel to analyzer but makes an angle of 45° with respect to analyzer in reflective region
Summary
Sunlight readability becomes a critical issue in image quality of LCDs because portable LCDs and public information displays are widely used nowadays. The commercialized transflective LCDs in early times need dual cell gap [1,2] with several compensation films and show narrow viewing angle in the transmissive region To solve these problems, the single cell-gap transflective LCDs have been proposed using several different LC modes, such as twisted nematic (TN) [3], electrically controlled birefringence (ECB) [4,5], vertical alignment (VA) [6,7], and fringe-field switching (FFS) [8,9,10,11] and in-plane switching (IPS) [12,13,14]. Surface pretilt angle in the reflective region is controlled to achieve retardation of λ/4
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