Optical: systems and elements – Glare or unwanted light reduction – Directional or angular discrimination
Reexamination Certificate
2002-09-26
2004-11-09
Sikder, Mohammad (Department: 2872)
Optical: systems and elements
Glare or unwanted light reduction
Directional or angular discrimination
C359S609000
Reexamination Certificate
active
06814452
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a touch panel, which has a light-shielding effect in its peripheral portion and is able to improve the visibility of its screen at low cost and also cope with a reduction in thickness of a product provided with an LCD with a touch panel.
BACKGROUND ART
Conventionally, an analog resistive film system touch panel, where conductive panels
201
and
202
are arranged opposite to each other with transparent electrodes
212
and
222
formed with the whole or a part of transparent conductive films and wiring lines formed on one-side surfaces of transparent insulative substrates
211
and
221
, is arranged on the screen of a liquid crystal display (LCD) of a word processor, a personal computer, or the like. By effecting downward pressurization with a finger, a pen, or the like according to instructions seen through the screen, positional inputting is effected.
The above-mentioned analog resistive film system touch panel normally includes one or more resin layers for various purposes in its peripheral portion located between the transparent insulative substrates
211
and
221
. One example of the above-mentioned resin layer, as shown in
FIG. 4
, has an adhesion layer
203
formed for the purpose of bonding the conductive panels to each other between the conductive panel
201
located on the touch input side and the conductive panel
202
located on the screen side. There are further included a wiring line overcoat layer
227
, which is formed for the purpose of mutually insulating the wiring lines arranged parallel in the peripheral portions of a surface that has wiring lines of lead electrodes
223
, routing circuits
224
and
225
, connection electrodes
226
, and the like of a conductive panel with interposition of a wiring oxidation inhibitor or a minute gap, an insulative is patterning layer
214
formed for the purpose of obtaining the transparent electrode
212
by insulating the peripheral portion of a surface that has on its entire surface the transparent conductive film
121
of the transparent insulative substrate
211
, and so on.
Moreover, as an illuminator used for the LCD
6
, a back light
7
is arranged on the back surface when the LCD
6
is a transmission type (see
FIG. 5
) or a front light
8
is arranged between the touch panels
5
and the LCD
6
when the LCD
6
is a reflection type liquid crystal (see FIG.
6
). Either light is provided with a line light source
72
or
82
such as a cold cathode tube arranged on an end surface of its light guide plate
71
or
81
made of a transparent resin or the like. A beam of light taken in from the end surface of the light guide plate
71
or
81
is guided depthwise while being totally reflected inside the light guide plate
71
or
81
, and a part of the light is emitted from one surface of the light guide plate
71
or
81
to illuminate the LCD
6
.
In recent years, according to the dimensional reduction of products provided with an LCD with a touch panel of a word processor, a personal computer, or the like and the dimensional increase of their screens, the outside dimensions of the light guide plates
71
and
81
of the back light
7
and the front light
8
have come close to the screen dimensions of the products. As a result, a luminescent line has occurred in a portion located inside the screen near the edge on the line light source
72
or
82
side due to intense light, which has been incident from the line light source
72
or
82
to enter the light guide plate
71
or
81
and emitted as it is from the neighborhood of the line light source, and this has reduced visibility. Moreover, even with a side surface reflecting layer
73
or
83
provided on the side surface on which the line light source
72
or
82
of the light guide plate
71
or
81
has been absent, a luminescent line has similarly occurred in a portion located inside the screen near the edge on the side surface reflecting layer
73
or
83
side due to scatter reflections on the side surface reflecting layer.
Accordingly, there is presently taken a means for restraining the occurrence of the luminescent line by sticking a frame-shaped black light-shielding sheet
9
to the touch panel
5
(see FIG.
5
and FIG.
6
), the back light
7
, the front light
8
, the LCD
6
, or the like.
However, measures against the luminescent line needs the operation of preparing and sticking a black light-shielding sheet only for the measures against the luminescent line aside from the construction of the touch panel, the LCD, and so on, and this leads to a problem that the production cost costs high. Furthermore, the black light-shielding sheet is cut in a frame-like shape with its inside portion scrapped, and this leads to wastefulness.
Moreover, the total thickness of the product provided with an LCD with a touch panel, such as a word processor or a personal computer, has increased by the thickness of the black light-shielding sheet, and this has led to an issue that the arrangement has not been able to cope with the thickness reduction of the product.
Accordingly, an object of the present invention is to solve the aforementioned issues and provide a touch panel, which has a light-shielding effect in the peripheral portion and is able to improve the visibility of its screen at low cost and also cope with a reduction in thickness of a product provided with an LCD with a touch panel.
DISCLOSURE OF INVENTION
In order to achieve the aforementioned object, the present invention is constructed as follows.
In order to achieve the aforementioned object, according to a first aspect of the present invention, there is provided an analog resistive film system touch panel comprising:
conductive panels arranged opposite to each other with transparent electrodes having a light-shielding effect in its peripheral portion being formed by a whole or a part of transparent conductive films and wiring lines formed on one-side surfaces of transparent insulative substrates; and
a resin layer comprised of one or more layers located peripherally between the transparent insulative substrates of the conductive panels arranged opposite to each other,
wherein at least one layer of the resin layers serves as a light-shielding layer for shielding light while being colored black.
According to a second aspect of the present invention, there is provided the touch panel having a light-shielding effect in its peripheral portion as defined in the first aspect, wherein the light-shielding layer is an adhesion layer, which is arranged between the conductive panels and colored black so as to shield light.
According to a third aspect of the present invention, there is provided the touch panel having a light-shielding effect in its peripheral portion as defined in the first or second aspect, wherein the light-shielding layer is at least one layer of wiring line overcoat layers, said at least one layer being arranged on the wiring line located in a peripheral portion of the conductive panel and colored black so as to shield light.
According to a fourth aspect of the present invention, there is provided the touch panel having a light-shielding effect in its peripheral portion as defined in the first or second aspect, wherein the light-shielding layer is at least one layer of insulative patterning layers, said at least one layer being arranged on the transparent conductive film located in a peripheral portion of the conductive panel and colored black so as to shield light.
According to a fifth aspect of the present invention, there is provided the touch panel having a light-shielding effect in its peripheral portion as defined in the third aspect, wherein the light-shielding layer is at least one layer of insulative patterning layers, said at least one layer being arranged on the transparent conductive film located in a peripheral portion of the conductive panel and colored black so as to shield light.
REFERENCES:
patent: 6211935 (2001-04-01), Yamada
patent: 60-000529 (1985-01-01), None
patent: 4-100140 (1992-04-01), None
patent: 8-241160 (1996
Nissha Printing Co. Ltd.
Sikder Mohammad
Wenderoth , Lind & Ponack, L.L.P.
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