We investigated how to achieve desired optical properties of quarter wave retardation films (QWFs) that increase the viewing angle of time-sequential stereoscopic 3D liquid crystal displays (LCDs), such as high luminance, low crosstalk, low color change, and low head-tilt-angle dependency. These display properties were strongly affected by the out-of plane retardation (Rth) of the QWF. We developed QWFs whose in-plane and out-of-plane retardation are independently controllable by adjustment of a polymerized discotic material layer and a triacetate cellulose film, and 3D-LCDs with high viewing angle properties were realized using these QWFs whose Rth was nearly zero. RPOL G C GLASS
We have succeeded in the development of a new front surface film, it has the function of improving the viewing-angle properties (especially, improvement of gray scale inversion in downside direction) of TN-mode TFT-LCDs, in addition to the conventional function of the protection of polarizer and the glare prevention under bright room surrounding 1) .The excellent viewing-angle properties have been realized in combing this new front surface film with the optical compensation film for TN-mode (Wide-View Film, for short WV Film). According to the proposal of this method, it has been expected to apply TN-mode to large-size LCD monitors and LCD TVs hereafter.
We investigated a light leakage at normal incidence of a vertically aligned liquid crystal display (VA-LCD) at black state. The light leakage was strongly affected by the polarization states of light obliquely incident on the cell. Experimental results were explained by a light scattering model of substrates on both sides of liquid crystal layer. Applying this result, we showed the light leakage can be highly reduced by controlling the retardation value of optical compensation film between the cell and a backlight unit.
We have already proposed a standard portrait for the assessment of preferable skin tone 1 . The present report describes a psychophysical experimental method, i.e., simultaneous triplet comparison that has been developed for the assessment of skin tone by using the portrait and that is characterized not only by a scalability, stability and reproducibility of the resulting scale values, but also by a reduced stress on observers. We have confirmed that the present simultaneous triplet comparison has a degree of scalability and stability almost equivalent to that of paired comparison that is most widely used for similar purposes, and that the stress on observers (expressed in terms of assessment time) is about half as much as that of paired comparison.
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