Review of viewing‐angle compensation of TN‐mode LCDs using WV film

— Wide-view (WV) films for TN-mode LCDs, which optimize the optical parameters of the polymerized discotic material (PDM) layer and cellulose triacetate (CTA) have been developed. The development concept of the WV film and realization of its concept in the past and for the future will be reviewed. In particular, the discotic molecular alignment control enabled the improvement of the contrast ratio at oblique viewing angles of TN-mode LCDs. In addition, color shifts at oblique angles are important for large-screen TN-mode LCD monitors and LCD-TV sets. To improve the color-shift problem, new technologies have been developed.