Liquid crystal display device
First Claim
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1. A liquid crystal display device comprising:
- a first polarizer plate that is disposed on one side of a liquid crystal cell in which a liquid crystal layer is sandwiched between two electrode-equipped substrates;
a second polarizer plate that is disposed on the other side of the liquid crystal cell;
a first phase plate that is disposed between the first polarizer plate and the liquid crystal cell;
a second phase plate that is disposed between the second polarizer plate and the liquid crystal cell;
a third phase plate that is disposed between the first polarizer plate and the first phase plate; and
a fourth phase plate that is disposed between the second polarizer plate and the second phase plate,whereinthe first phase plate and the third phase plate cooperate to impart a phase difference of a ¼
wavelength to linearly polarized light that emerges from the first polarizer plate, and the second phase plate and the fourth phase plate cooperate to impart a phase difference of a ¼
wavelength to linearly polarized light that emerges from the second polarizer plate,slow axes in planes of the first phase plate and the second phase plate are substantially parallel,a slow axis of the first phase plate and the second phase plate, a slow axis of the third phase plate and a slow axis of the fourth phase plate are disposed in such directions as to cancel in-plane anisotropiesa crossed-axes angle between slow axes in planes of the first phase plate and the third phase plate is 60°
,a crossed-axes angle between slow axes in planes of the second phase plate and the fourth phase plate is 60°
, anda crossed-axes angle between slow axes in planes of the third phase plate and fourth phase plate is 60°
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Abstract
A first phase plate and a third phase plate, which constitute a polarizer structure, cooperate to impart a phase difference of a ¼ wavelength to linearly polarized light that emerges from a first polarizer plate. A second phase plate and a fourth phase plate cooperate to impart a phase difference of a ¼ wavelength to linearly polarized light that emerges from a second polarizer plate. Slow axes in planes of the first phase plate and the second phase plate are substantially parallel. A crossed-axes angle between slow axes in planes of the first phase plate and the third phase plate is 60°, a crossed-axes angle between slow axes in planes of the second phase plate and the fourth phase plate is 60°, and a crossed-axes angle between slow axes in planes of the third phase plate and fourth phase plate is 60°.
10 Citations
10 Claims
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1. A liquid crystal display device comprising:
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a first polarizer plate that is disposed on one side of a liquid crystal cell in which a liquid crystal layer is sandwiched between two electrode-equipped substrates; a second polarizer plate that is disposed on the other side of the liquid crystal cell; a first phase plate that is disposed between the first polarizer plate and the liquid crystal cell; a second phase plate that is disposed between the second polarizer plate and the liquid crystal cell; a third phase plate that is disposed between the first polarizer plate and the first phase plate; and a fourth phase plate that is disposed between the second polarizer plate and the second phase plate, wherein the first phase plate and the third phase plate cooperate to impart a phase difference of a ¼
wavelength to linearly polarized light that emerges from the first polarizer plate, and the second phase plate and the fourth phase plate cooperate to impart a phase difference of a ¼
wavelength to linearly polarized light that emerges from the second polarizer plate,slow axes in planes of the first phase plate and the second phase plate are substantially parallel, a slow axis of the first phase plate and the second phase plate, a slow axis of the third phase plate and a slow axis of the fourth phase plate are disposed in such directions as to cancel in-plane anisotropies a crossed-axes angle between slow axes in planes of the first phase plate and the third phase plate is 60°
,a crossed-axes angle between slow axes in planes of the second phase plate and the fourth phase plate is 60°
, anda crossed-axes angle between slow axes in planes of the third phase plate and fourth phase plate is 60°
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification
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Current AssigneeJapan Display Central Incorporated (Japan Display Incorporated)
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Original AssigneeToshiba Matsushita Display Technology (Japan Display Incorporated)
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InventorsHisatake, Yuzo, Murayama, Akio, Tago, Chigusa
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Primary Examiner(s)Nelms; David C.
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Assistant Examiner(s)Chung; David Y
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Application NumberUS11/136,367Publication NumberTime in Patent Office1,140 DaysField of Search349/117, 349/119, 349/118, 349/120, 349/121US Class Current349/119CPC Class CodesG02F 1/133531 characterised by the arrang...G02F 1/133541 Circular polarisersG02F 1/13363 Birefringent elements, e.g....G02F 1/133634 the refractive index Nz per...G02F 1/133638 Waveplates, i.e. plates wit...G02F 1/1393 the birefringence of the li...G02F 2413/04 Number of plates greater th...G02F 2413/08 with a particular optical a...G02F 2413/12 Biaxial compensatorsG02F 2413/13 Positive birefingence
