Transparent touch panel and liquid crystal display device equipped with transparent touch panel
First Claim
Patent Images
1. A transparent touch panel, comprising:
- a pair of transparent conductive substrates each having a transparent conductive film formed on at least one surface and arranged such that the transparent conductive films of the transparent conductive substrates are allowed to face each other, said pair of transparent conductive substrates being brought into mutual contact upon depression of the transparent conductive substrate on the upper side so as to perform the position detection; and
a retardation film made of an amorphous plastic material, provided outside said transparent conductive films facing each other, meeting the relationship nz>
ny, and having a retardation R(0), which is represented by (nx−
ny)×
d, falling within a range of between 90 nm and 200 nm, where d represents the thickness of said retardation film, nx represents the maximum refractive index within the plane of the retardation film, ny represents the refractive index in a direction perpendicular to nx, and nz represents the refractive index in a thickness direction of the retardation film, the photoelasticity coefficient of the retardation film falling within a range of between 5×
10−
13 cm2/dyne and 65×
10−
13 cm2/dyne.
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Accused Products
Abstract
A transparent touch panel comprises a pair of transparent conductive substrates and a retardation film. A transparent conductive film is formed on at least one surface of each of these substrates and these substrates are arranged such that the transparent conductive films are allowed to face each other. By depressing the substrate, these substrates are brought into mutual contact to perform the position detection. The retardation film is made of an amorphous plastic material, meets the relationship nz>ny and has a retardation (nx−ny)×d falling within a range of between 90 nm and 200 nm, wherein d represents the thickness of the film, nx the maximum refractive index within the plane of the retardation film, ny the refractive index in a direction perpendicular to nx, and nz the refractive index in the thickness direction of the retardation film.
99 Citations
35 Claims
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1. A transparent touch panel, comprising:
-
a pair of transparent conductive substrates each having a transparent conductive film formed on at least one surface and arranged such that the transparent conductive films of the transparent conductive substrates are allowed to face each other, said pair of transparent conductive substrates being brought into mutual contact upon depression of the transparent conductive substrate on the upper side so as to perform the position detection; and
a retardation film made of an amorphous plastic material, provided outside said transparent conductive films facing each other, meeting the relationship nz>
ny, and having a retardation R(0), which is represented by (nx−
ny)×
d, falling within a range of between 90 nm and 200 nm, where d represents the thickness of said retardation film, nx represents the maximum refractive index within the plane of the retardation film, ny represents the refractive index in a direction perpendicular to nx, and nz represents the refractive index in a thickness direction of the retardation film, the photoelasticity coefficient of the retardation film falling within a range of between 5×
10−
13 cm2/dyne and 65×
10−
13 cm2/dyne.- View Dependent Claims (2, 3, 4, 5, 6, 7)
a polarizing plate arranged on the side of the display surface;
a liquid crystal cell; and
said transparent touch panel being arranged between the polarizing plate and the liquid crystal cell.
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7. The liquid crystal display device equipped with a touch panel according to claim 6, wherein an antireflection treatment is applied to said polarizing plate.
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8. A liquid crystal display device equipped with a touch panel, comprising a polarizing plate, a first retardation film, a touch panel, a second retardation film and a liquid crystal cell, which are arranged in the order mentioned,
wherein, said touch panel is a resistance film type transparent touch panel, the retardation value represented by (nx− - ny)×
d falls within a range of between 90 nm and 200 nm, where nx represents the refractive index in the direction of the slow axis (maximum refractive index) within the planes of the first and second retardation films, ny represents the refractive index in a direction perpendicular to the slow axis, nz represents the refractive index in the thickness direction of the first and second retardation films, and d represents the thickness of the first and second retardation films,the first retardation film meets the relationship nz≦
ny, andthe second retardation film meets the relationship nz>
ny.- View Dependent Claims (9, 10, 11, 12, 13, 14)
- ny)×
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15. A liquid crystal display device equipped with a touch panel, comprising a polarizing plate, a first retardation film, a touch panel, a second retardation film and a liquid crystal cell, which are arranged in the order mentioned,
wherein, said touch panel is a resistance film type transparent touch panel, the retardation value represented by (nx− - ny)×
d falls within a range of between 90 nm and 200 nm, where nx represents the refractive index in the direction of the slow axis (maximum refractive index) within the planes of the first and second retardation films, ny represents the refractive index in a direction perpendicular to the slow axis, nz represents the refractive index in the thickness direction of the first and second retardation films, and d represents the thickness of the first and second retardation film,the first retardation film meets the relationship nz≦
ny,the second retardation film meets the relationship nz>
ny, andthe first and second retardation films are arranged such that the nx directions of these retardation films are substantially perpendicular to each other. - View Dependent Claims (16, 17, 18, 19, 20, 21)
- ny)×
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22. A liquid crystal display device equipped with a touch panel, comprising a polarizing plate, a first retardation film, a touch panel, a second retardation film and a liquid crystal cell, which are arranged in the order mentioned,
wherein, said touch panel is a resistance film type transparent touch panel, the retardation value represented by (nx− - ny)×
d falls within a range of between 90 nm and 200 nm, where nx represents the refractive index in the direction of the slow axis (maximum refractive index) within the planes of the first and second retardation films, ny represents the refractive index in a direction perpendicular to the slow axis, nz presents the refractive index in the thickness direction of the first and second retardation films, and d represents the thickness of the first and second retardation films,at least one of the first and second retardation films meets the relationship nz>
ny, andthe first and second retardation films are arranged such that the nx directions of these retardation films are substantially perpendicular to each other. - View Dependent Claims (23, 24, 25, 26, 27, 28)
- ny)×
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29. A liquid crystal display device equipped with a touch panel, comprising a polarizing plate, a first retardation film, a touch panel, a second retardation film and a liquid crystal cell, which are arranged in the order mentioned,
wherein, said touch panel is a resistance film type transparent touch panel, the retardation value represented by (nx− - ny)×
d falls within a range of between 90 nm and 200 nm, where nx represents the refractive index in the direction of the slow axis (maximum refractive index) within the planes of the first and second retardation films, ny represents the refractive index in a direction perpendicular to the slow axis, nz represents the refractive index in the thickness direction of the first and second retardation films, and d represents the thickness of the first and second retardation films,at least one of the first and second retardation films meets the relationship nz>
ny, andthe first retardation film is made of a resin having a photoelasticity coefficient falling within a range of between 5×
10−
13 cm2/dyne and 65×
10−
13 cm2/dyne.- View Dependent Claims (30, 31, 32, 33, 34, 35)
- ny)×
Specification
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- Resources
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Current AssigneeKaneka Corporation
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Original AssigneeKaneka Corporation
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InventorsFujii, Sadao, Hikida, Toshihiko, Asaoka, Keizo
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Primary Examiner(s)Sikes, William L.
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Assistant Examiner(s)Qi, Mike
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Application NumberUS09/741,286Publication NumberTime in Patent Office557 DaysField of Search349/12, 349/117, 349/118, 349/119, 349/120US Class Current349/12CPC Class CodesG02F 1/13338 Input devices, e.g. touch p...G02F 1/13363 Birefringent elements, e.g....G02F 1/133634 the refractive index Nz per...G06F 3/045 using resistive elements, e...
