Reducing color shift

A liquid crystal display device reduces the color shift problem typically observed at wide viewing angles; the device includes a phase retardation compensation film, a biaxial compensation film, and a liquid crystal display panel between the two films. Refractive indexes of the phase retardation com...

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Bibliographische Detailangaben
Hauptverfasser:	TU PEI SHAN, WANG CHUN JUI
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	A liquid crystal display device reduces the color shift problem typically observed at wide viewing angles; the device includes a phase retardation compensation film, a biaxial compensation film, and a liquid crystal display panel between the two films. Refractive indexes of the phase retardation compensation film having a thickness d1 and the biaxial compensation film having a thickness d2 are nx1, ny1, nz1, nx2, ny2, and nz2 in a first, a second and a third directions perpendicular to each other. The third direction is parallel to the normal directions of the surfaces of the phase retardation compensation film and the biaxial compensation film. Optical compensation values of the phase retardation compensation film and the biaxial compensation film are Rth1 and Rth2 and derived from [(nx1+ny1)/2-nz1]xd1 and [(nx2+ny2)/2-nz2]xd2 respectively. Rth1 is not less than 50 nm, and the sum of Rth1 and Rth2 can be equal to 271 nm.