Abstract
Abstract— Conventional TFT TN‐LCDs display full‐color images only within a narrow vertical viewing angle. Viewed obliquely, the display reverses or brightens. We studied these problems by calculating the light propagation through TN cells and concluded that these reversal phenomena are unavoidable in TN‐LCDs. To widen the viewing angle, we propose a film‐laid double‐twisted‐nematic display (FDTN), consisting of a conventional TN panel, a light‐compensation panel, and two retardation films stacked together. The problem of black images appearing purple is solved using a clockwise‐twisted nematic panel as an optical compensator. The viewing angle of the FDTN‐LCD is about 1.5 times that of the conventional positive TN‐LCD. The contrast ratio normal to the panel exceeds 100.
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