General film compensated reflective LCD having LC layer with middle layer satisfying a predetermined relationship between phase retardation and half residual phase depending on an external electric field
First Claim
Patent Images
1. A liquid crystal display, comprising:
- a liquid crystal cell comprising a first substrate, a second substrate, and a liquid crystal layer interposed therebetween, and the liquid crystal cell having a twisted angle φ and
a half residual phase α
depending on an external electric field, wherein the liquid crystal layer comprises a middle layer, a first boundary layer sandwiched between the middle layer and the first substrate, and a second boundary layer sandwiched between the middle layer and the second substrate;
a compensation film disposed on the liquid crystal cell, and having a phase retardation δ
in the range of (δ
0−
0.2π
)≦
δ
≦
(δ
0+0.2π
) and a slow axis angle θ
in the range of 0°
≦
θ
≦
180°
; and
a polarizer disposed on the compensation film and on an ambient light entrance side and having a polarizer angle β
in the range of (β
0−
20°
+n·
90°
)≦
β
≦
(β
0+20°
+n·
90°
);
wherein the compensation film is sandwiched between the polarizer and the liquid crystal cell,wherein the phase retardation δ
0 satisfies the following relation;
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Accused Products
Abstract
A liquid crystal display having at least one of high contrast ratio, high reflectance, and low color dispersion is disclosed. Based on the total boundary residual retardation, the corresponding compensation film and polar conditions may be calculated. Using the compensation film and polarizer conditions, a general film compensated reflective twisted-nametic liquid crystal display (GF-RTN-LCD) may be obtained.
4 Citations
9 Claims
-
1. A liquid crystal display, comprising:
-
a liquid crystal cell comprising a first substrate, a second substrate, and a liquid crystal layer interposed therebetween, and the liquid crystal cell having a twisted angle φ and
a half residual phase α
depending on an external electric field, wherein the liquid crystal layer comprises a middle layer, a first boundary layer sandwiched between the middle layer and the first substrate, and a second boundary layer sandwiched between the middle layer and the second substrate;a compensation film disposed on the liquid crystal cell, and having a phase retardation δ
in the range of (δ
0−
0.2π
)≦
δ
≦
(δ
0+0.2π
) and a slow axis angle θ
in the range of 0°
≦
θ
≦
180°
; anda polarizer disposed on the compensation film and on an ambient light entrance side and having a polarizer angle β
in the range of (β
0−
20°
+n·
90°
)≦
β
≦
(β
0+20°
+n·
90°
);wherein the compensation film is sandwiched between the polarizer and the liquid crystal cell, wherein the phase retardation δ
0 satisfies the following relation; - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A liquid crystal display, comprising:
-
a liquid crystal cell comprising a first substrate, an opposing reflective substrate, and a liquid crystal layer interposed therebetween, the liquid crystal layer having a twisted angle φ and
a half residual phase α
depending on an external electric field;
the liquid crystal layer comprising a middle layer and at least one boundary layer, wherein a total residual phase of the liquid crystal cell satisfies the following relation α
=2π
·
ψ
/λ
;
wherein ψ
is a residual retardation of each boundary sub-layer and λ
is a wavelength of light;a compensation film disposed on the liquid crystal cell and on an ambient light entrance side, and having a phase retardation δ
in the range of (δ
0−
0.2π
)≦
δ
≦
(δ
0+0.2π
) and a slow axis angle θ
in the range of 0°
≦
θ
≦
180°
; anda polarizer disposed on the compensation film and having a polarizer angle β
in the range of (β
0−
20°
+n·
90°
)≦
β
≦
(β
0+20°
+n·
90°
);wherein the compensation film is sandwiched between the polarizer and the liquid crystal cell, wherein the phase retardation δ
0 satisfies the following relation; - View Dependent Claims (8, 9)
-
Specification
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Current AssigneeInnoLux Corporation, University of Central Florida (State University System of Florida)
-
Original AssigneeTPO Displays Corporation (InnoLux Corporation)
-
InventorsWu, Shin-Tson, Zhu, Xinyu
-
Primary Examiner(s)Nelms; David
-
Assistant Examiner(s)HEYMAN, JOHN S
-
Application NumberUS11/025,074Publication NumberTime in Patent Office1,545 DaysField of Search349/117, 349/96, 349/119US Class Current349/117CPC Class CodesG02F 1/13363 Birefringent elements, e.g....G02F 2413/01 Number of plates being 1G02F 2413/08 with a particular optical a...
