Reflective type liquid crystal display device
First Claim
Patent Images
1. A reflective type liquid crystal display device comprising:
- a first light-transmittable insulating substrate, including at least one transparent electrode;
a second insulating substrate;
a reflector formed on the second insulating substrate, the reflector forming at least one second electrode for display driving in connection with the at least one transparent electrode;
a liquid crystal layer sealed between the first light-transmittable substrate and the reflector, the liquid crystal layer including nematic liquid crystal molecules;
an optical phase compensating member disposed on the first light-transmittable substrate; and
a polarizer at a light incident side, disposed on the optical phase compensating member,wherein the director direction of the liquid crystal molecules of the liquid crystal layer is almost orthogonal to a slow direction of the optical phase compensating member, andfurther wherein a light transmission state is selected when a retardation Δ
n1 d1, wherein Δ
n1 is an optical anisotropy of the liquid crystal layer and d1 is a thickness of the liquid crystal layer, and a retardation Δ
n2 d2, wherein Δ
n2 is an optical anisotropy of the optical phase compensating member and d2 is a thickness of the optical phase compensating member, are in a relation of
space="preserve" listing-type="equation">|Δ
n.sub.1 d.sub.1 -Δ
n.sub.2 d.sub.2 |/λ
=m/2±
0.1, (1)wherein m is an integer and λ
is a wavelength in a range of 400 to 700 nm, upon application of a voltage V1 (V1 ≧
0) and a light shielding state is selected when the retardation of the liquid crystal cell and the optical phase compensating member are in a relation of
space="preserve" listing-type="equation">|Δ
n.sub.1 d.sub.1 -Δ
n.sub.2 d.sub.2 |/λ
=0.25+m/2±
0.1, (2)upon application of a voltage V2 (V2 >
V1), wherein a numerical value of |Δ
n1 d1 -Δ
n2 d2 | is varied depending on an electric field applied to the liquid crystal layer, and still further wherein the relation (Δ
nλ
)F>
(Δ
nλ
)Lc is satisfied when Δ
n1 d1 >
Δ
n2 d2 is met in the light shielding state, wherein (Δ
nλ
)F is a magnitude of wavelength dispersion of the optical compensating member and (Δ
nλ
)Lc is a magnitude of wavelength dispersion of the liquid crystal layer, and the relation (Δ
nλ
)F<
(Δ
nλ
)Lc is satisfied when Δ
n1 d1 <
Δ
n2 d2 is met in the light shielding state.
0 Assignments
0 Petitions
Accused Products
Abstract
A liquid crystal display device of high display quality and superior sharpness is presented. Large bumps and small bumps made of synthetic resin material are formed on a glass substrate. Covering these bumps and filling the recesses among the bumps, a smoothing film is formed. On the smoothing film, a reflective metal film made of metal material such as aluminum is formed. This reflective metal film is formed in plural rows in a longitudinal band form. On the glass substrate, the bumps, smoothing film, and reflective metal film are combined to compose a reflector. An orientation film is formed on the reflective metal film. By the electric field applied in the liquid crystal layer so as to be in the light shielding state when the retardation Δn1 d1 of the liquid crystal cell and the retardation Δn2 d2 of the substrate possessing optical phase compensating function satisfy |Δn1 d1 -Δn2 d2 |/λ=0.25+m/2±0.1 (m=0, 1, 2, - - - ), and in the light transmitting state when satisfying |Δn1 d1 -Δn2 d2 |λ=m/2±0.1 (m=0, 1, 2, - - - ), by crossing the director direction of the liquid crystal molecule of the liquid crystal cell and the slow direction of the substrate possessing optical phase compensating function almost orthogonally, the value of |Δn1 d1 -Δn2 d2 |/λ is varied, and these two states are used to present a display, and the absorption axis or transmission axis of the polarizer is set at 30° to 60° to the director direction of the liquid crystal molecule of the liquid crystal cell.
-
Citations
10 Claims
-
1. A reflective type liquid crystal display device comprising:
-
a first light-transmittable insulating substrate, including at least one transparent electrode; a second insulating substrate; a reflector formed on the second insulating substrate, the reflector forming at least one second electrode for display driving in connection with the at least one transparent electrode; a liquid crystal layer sealed between the first light-transmittable substrate and the reflector, the liquid crystal layer including nematic liquid crystal molecules; an optical phase compensating member disposed on the first light-transmittable substrate; and a polarizer at a light incident side, disposed on the optical phase compensating member, wherein the director direction of the liquid crystal molecules of the liquid crystal layer is almost orthogonal to a slow direction of the optical phase compensating member, and further wherein a light transmission state is selected when a retardation Δ
n1 d1, wherein Δ
n1 is an optical anisotropy of the liquid crystal layer and d1 is a thickness of the liquid crystal layer, and a retardation Δ
n2 d2, wherein Δ
n2 is an optical anisotropy of the optical phase compensating member and d2 is a thickness of the optical phase compensating member, are in a relation of
space="preserve" listing-type="equation">|Δ
n.sub.1 d.sub.1 -Δ
n.sub.2 d.sub.2 |/λ
=m/2±
0.1, (1)wherein m is an integer and λ
is a wavelength in a range of 400 to 700 nm, upon application of a voltage V1 (V1 ≧
0) and a light shielding state is selected when the retardation of the liquid crystal cell and the optical phase compensating member are in a relation of
space="preserve" listing-type="equation">|Δ
n.sub.1 d.sub.1 -Δ
n.sub.2 d.sub.2 |/λ
=0.25+m/2±
0.1, (2)upon application of a voltage V2 (V2 >
V1), wherein a numerical value of |Δ
n1 d1 -Δ
n2 d2 | is varied depending on an electric field applied to the liquid crystal layer, and still further wherein the relation (Δ
nλ
)F>
(Δ
nλ
)Lc is satisfied when Δ
n1 d1 >
Δ
n2 d2 is met in the light shielding state, wherein (Δ
nλ
)F is a magnitude of wavelength dispersion of the optical compensating member and (Δ
nλ
)Lc is a magnitude of wavelength dispersion of the liquid crystal layer, and the relation (Δ
nλ
)F<
(Δ
nλ
)Lc is satisfied when Δ
n1 d1 <
Δ
n2 d2 is met in the light shielding state. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A reflective type liquid crystal display device comprising:
-
a first light-transmittable substrate, including at least one transparent electrode; a second insulating substrate; a reflector formed on the second insulating substrate, the reflector forming at least one second electrode for display driving in connection with the at least one transparent electrode; a liquid crystal layer sealed between the first light-transmittable substrate and the reflector, the liquid crystal layer including nematic liquid crystal molecules; an optical phase compensating member disposed on the first light-transmittable substrate; and a polarizer at a light incident side, disposed on the optical phase compensating member, wherein the director direction of the liquid crystal molecules of the liquid crystal layer is almost orthogonal to a slow direction of the optical phase compensating member, and further wherein a light shielding state is selected when a retardation Δ
n1 d1, where Δ
n1 is an optical anisotropy of the liquid crystal layer and d1 is a thickness of the liquid crystal layer, and a retardation Δ
n2 d2, where Δ
n2 is an optical anisotropy of the optical phase compensating member and d2 is a thickness of the optical phase compensating member, are in a relation of
space="preserve" listing-type="equation">|Δ
n.sub.1 d.sub.1 -Δ
n.sub.2 d.sub.2 |/λ
=0.25+m/2±
0.1, (2)wherein m is an integer and γ
is a wavelength in a range of 400 to 700 nm, upon application of a voltage V1 (V1 ≧
0) and a light transmission state is selected when the retardation of the liquid crystal cell and the optical phase compensating member are in a relation of
space="preserve" listing-type="equation">|Δ
n.sub.1 d.sub.1 -Δ
n.sub.2 d.sub.2 |/λ
=m/2±
0.1, (1)upon application of a voltage V2 (V2 >
V1), wherein a numerical value of |Δ
n1 d1 -Δ
n2 d2 | is varied depending on an electric field applied to the liquid crystal layer and still further wherein the relation (Δ
nλ
)F>
(Δ
nλ
)Lc is satisfied when Δ
n1 d1 >
Δ
n2 d2 is met in the light shielding state, wherein (Δ
nλ
)F is a magnitude of wavelength dispersion of the optical compensating member and (Δ
nλ
)Lc is a magnitude of wavelength dispersion of the liquid crystal layer, and the relation (Δ
nλ
)F<
(Δ
nλ
)Lc is satisfied when Δ
n1 d1 <
Δ
n2 d2 is met in the light shielding state. - View Dependent Claims (7, 8, 9, 10)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeSharp Electronics Corporation (Hon Hai Precision Industry Co., Ltd.), Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
-
Original AssigneeSharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
-
InventorsMitsui, Seiichi, Kimura, Naofumi, Seki, Hidehiro, Nakamura, Kozo, Uchida, Tatsuo
-
Primary Examiner(s)Sikes, William L.
-
Assistant Examiner(s)TON, MINH TOAN T
-
Application NumberUS08/887,219Time in Patent Office524 DaysField of Search349/117, 349/49, 349/113US Class Current349/99CPC Class CodesG02F 1/133531 characterised by the arrang...G02F 1/133553 Reflecting elements associa...G02F 1/13363 Birefringent elements, e.g....G02F 1/133637 characterised by the wavele...G02F 1/1347 Arrangement of liquid cryst...G02F 2203/02 reflectiveG02F 2413/01 Number of plates being 1G02F 2413/08 with a particular optical a...
