JP2014016589A - Polarizing plate-integrated conductive optical laminate and display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polarizing plate-integrated conductive optical laminate that can be reduced in thickness, make a display screen of an image display device flat, suppress a change in dimension with respect to a change in humidity to prevent the occurrence of curling, and further has electromagnetic wave shielding performance.SOLUTION: A polarizing plate-integrated conductive optical laminate 1 has a conductive film 11 formed by laminating a conductive layer 112 on a transparent substrate 111, and a polarizing element film 12 laminated thereon. The transparent substrate 111 has a dimensional change rate with respect to humidity change of equal to or less than 0.6%.

Description

  The present invention relates to a polarizing plate integrated conductive optical laminate in which a polarizing plate and a conductive optical laminate are integrated.

  In a liquid crystal display device (LCD), a pair of polarizing plates are usually arranged on the front and back of a liquid crystal cell. In an organic electroluminescence (EL) display device, a polarizing plate, particularly an elliptical or circular polarizing plate, is provided on the viewing side of the organic EL element. Is often installed to provide an anti-reflection function. These polarizing plates are provided with an optical laminate having functions such as antireflection and hard coat on the outermost surface.

  In general, the image display panel is provided with a driver IC or the like for driving the image display panel on an outer peripheral portion that is off the display screen. In the image display device, a frame-like member called a bezel (metal cover) is provided on the outermost surface so as to surround the periphery of the display screen, and the driver IC is hidden from the display screen by the bezel (Patent Literature). 1 and 2).

  By the way, in recent years, the flattening of the display screen has been promoted along with the thinning of the image display device. However, in the image display device having a configuration including such a bezel, the bezel protrudes from the display screen and is flat. Could not display screen.

  Therefore, for example, a polarizing plate integrated optical laminate in which a frame for concealing a driver IC for driving the image display panel is formed by printing between the optical laminate and the polarizing element film is used as the display screen of the image display panel. A method of arranging the image display device on the side and flattening the display screen of the image display device has been considered. Since the polarizing plate integrated optical laminate having such a configuration does not require a bezel for concealing the driver IC on the outermost surface, the display screen can be flattened.

  However, in order to reduce the thickness of the image display device, it is essential to reduce the thickness of the polarizing plate-integrated optical laminate. The polarizing plate-integrated optical laminate having such a configuration includes a conventional polarizing film and an optical stack. During this period, it is necessary to form a layer including a frame for concealing the driver IC, so that the demand for thinning cannot be sufficiently met.

  Conventionally, an optical laminate has a structure in which a hard coat layer is laminated on a light-transmitting substrate, and the light-transmitting substrate is made of a cellulose ester typified by triacetyl cellulose. A film was used (see Patent Document 3). This is because cellulose ester is excellent in transparency and optical isotropy, and has almost no phase difference in the plane (almost no birefringence in the plane), so that the vibration direction of incident linearly polarized light can be changed. It is possible to prevent a phenomenon in which unevenness of different colors (hereinafter also referred to as “Nizimura”) occurs in the liquid crystal display device due to the birefringence of the base material, and has appropriate water permeability. Therefore, it is based on the advantage that moisture remaining in the polarizer when the optical laminate-integrated polarizing plate can be dried through the optical laminate.

  However, the cellulose ester film is a disadvantageous material in terms of cost, and has insufficient moisture resistance and heat resistance. When the optical laminate is used as a polarizing plate protective film in a hot and humid environment, the cellulose ester film is When the image display device is an LCD, for example, when the image display device is an LCD, the entire liquid crystal cell is curled and the display quality is deteriorated. Examples of the entire liquid crystal cell being curled and the display quality being lowered include, for example, the case where the liquid crystal cell curls and adheres to the backlight member, thereby causing partial moire or unevenness. Such a problem is that the glass plate of a liquid crystal cell has conventionally been 0.5 to 1 mm thick in the thinning of LCDs for notebook personal computers, LCDs for mobile terminals, LCDs for mobile phones, etc. This is because the adoption of glass plates with a thickness of less than 0.5 mm is progressing.

  On the other hand, in a display device such as a liquid crystal display device (LCD), in particular, a small LCD (mobile phone, smartphone, etc.) that has been rapidly spreading in recent years, malfunction of the LCD drive circuit, front-side installed electric drive device (touch panel) In order to suppress malfunctions of the unit, etc., peripheral devices, and the human body, it is essential to dispose a member for electromagnetic wave shielding, such as an electromagnetic wave shielding sheet, separately from the optical laminated body, etc. It has become. For example, as a member for shielding such electromagnetic waves, an electromagnetic wave shielding sheet for the front surface of a PDP in which a conductive pattern made of conductive ink containing silver particles or the like is provided on a transparent substrate is disclosed (see Patent Document 4). Such separate lamination of the electromagnetic wave shielding sheet or the like goes against the demand for thinning and cost reduction of the display device, and some improvement means has been demanded.

  In addition, as a transparent base material for constituting such an electromagnetic wave shielding sheet, although it is disadvantageous in terms of cost, as described above, cellulose represented by triacetyl cellulose (TAC) with low birefringence is used. Films made of esters have been commonly used.

JP 2005-215185 A JP 2010-271629 A JP 2003-149438 A JP 2010-271629 A

  In view of the above situation, the present invention provides an optical laminate having electromagnetic wave shielding performance, which is a polarizing plate-integrated conductive optical laminate capable of preventing the occurrence of curling by suppressing a dimensional change with respect to a humidity change. The purpose is to provide.

  The present inventor has intensively studied to solve the above-mentioned problems, and comprises a conductive film in which a conductive layer is laminated on a transparent base material having a dimensional change rate with respect to humidity being a predetermined value or less, and a polarizing element film. The idea of integration was reached, and the present invention was completed.

  Specifically, the present invention provides the following.

  (1) A polarizing plate-integrated conductive optical laminate in which a conductive film in which a conductive layer is laminated on a transparent substrate and a polarizing element film are laminated, wherein the transparent substrate has a humidity Polarizing plate-integrated conductive optical laminate having a dimensional change rate of 0.6% or less.

  According to (1), the dimensional change with respect to the humidity change can be suppressed, the curling of the liquid crystal panel unit or the like can be prevented, and the electromagnetic wave can be shielded by the conductive layer. Thereby, a preferable display quality can be exhibited in the display device. In addition, it is possible to use a material that is generally less expensive than the conventional one, and furthermore, the amount of material used can be reduced by integration, so that the cost can be greatly reduced.

  (2) The polarizing plate-integrated conductive optical laminate according to (1), wherein the transparent substrate has a retardation of 3000 nm or more.

  According to (2), by using a transparent base material whose retardation is limited to a specific range, the occurrence of Nizimura can be suppressed.

  (3) The transparent base material has a refractive index (nx) in the direction of the slow axis that is the direction having the largest refractive index in the plane, and the direction of the fast axis that is orthogonal to the direction of the slow axis. The polarizing plate integrated conductive optical laminate according to claim 1, wherein a difference (nx−ny) from a refractive index (ny) of the polarizing plate is 0.05 or more.

  According to (3), according to (3), generation | occurrence | production of nitrile can be suppressed more highly in a display apparatus. In addition, the above-mentioned predetermined retardation value can be obtained within a preferable film thickness range without unnecessarily increasing the film thickness of the transparent substrate.

  (4) The angle formed by the absorption axis of the polarizing element film and the transparent substrate is such that the absorption axis of the polarizing element film and the slow axis of the transparent substrate are 0 ° ± 30 ° or 90 ° ± 30. The polarizing plate-integrated conductive optical laminate according to (2) or (3), which is laminated so as to have an angle of °.

  According to (4), it is possible to provide a display device capable of extremely highly suppressing the occurrence of nitrile in the display image.

  (5) The polarizing element film absorption axis and the transparent base material are laminated so that the angle formed by the polarizing element film absorption axis and the slow base axis of the transparent base material is 45 ° ± 30 °. The polarizing plate integrated conductive optical laminate according to (2) or (3).

  According to (5), when it is necessary to visually recognize a display device such as a touch panel device by using polarized sunglasses, it is possible to effectively utilize the optical characteristics that prevent nitrite and The light can be emitted by light having a linearly polarized light component orthogonal thereto, so that the display screen can be seen even when polarized sunglasses are used.

  (6) The transparent substrate is made of polyester resin, polyolefin resin, (meth) acrylic resin, polyurethane resin, polyether sulfone resin, polycarbonate resin, polysulfone resin, polyether resin, polyether. The polarizing plate integrated type according to any one of (1) to (5), which comprises any one material selected from the group consisting of a ketone-based resin, a (meth) acrylonitrile-based resin, and a cycloolefin-based resin. Conductive optical laminate.

  According to (6), while maintaining the preferable light transmittance of the transparent base material, the dimensional change rate with respect to humidity can be 0.6% or less, and the predetermined retardation value described above can be obtained. Can be sufficiently suppressed.

  (7) The polarizing plate integrated conductive optical laminate according to (6), wherein the transparent substrate is polyethylene terephthalate.

  According to (7), in addition to the effect of (6), the range of selection of heating conditions accompanying the manufacture and processing of the electromagnetic wave shielding sheet is expanded. Thereby, a conductive layer with high shielding performance can be more easily formed on a transparent substrate at low cost.

  (8) The polarizing plate integrated conductive optical laminate according to any one of (1) to (7), wherein the conductive layer is a conductive film made of a transparent conductive material.

  According to (8), it is possible to provide a liquid crystal display device that is excellent in electromagnetic wave shielding and light transmittance and that can highly suppress the occurrence of nitrile.

  (9) The polarizing plate according to any one of (1) to (8), wherein the conductive layer has a substantially transparent pattern having an opening and an opaque portion, and the opaque portion is made of a metal or conductive ink. Body-type conductive optical laminate.

  According to (9), it is possible to create a conductive pattern layer in an apparently transparent manner using various conductive metal materials and conductive ink.

  (10) A display device comprising: the polarizing plate-integrated conductive optical laminate according to any one of (1) to (9); and a liquid crystal panel unit.

  According to (10), the dimensional change with respect to the humidity change can be suppressed to prevent the occurrence of curling of the liquid crystal panel unit or the like, and the electromagnetic wave can be shielded by the conductive layer. A display device capable of transmitting light can be provided.

  (11) The display device according to (10), wherein the polarizing plate integrated conductive optical laminate is disposed on a light-emitting surface side of the liquid crystal panel unit.

  According to (11), the polarizing plate-integrated conductive optical laminate can be arranged on the image display panel to manage color and the like, and management in the manufacturing process can be simplified. In addition, the electromagnetic wave can be efficiently shielded by shielding the electromagnetic wave on the vicinity side of the electromagnetic wave generation source. The electromagnetic wave can be shielded efficiently by shielding the electromagnetic wave in the vicinity of the electromagnetic wave generation source.

  (12) The display device according to (10) or (11), wherein the touch panel unit includes a touch panel unit at a position opposite to the liquid crystal panel unit.

  According to (12), it is possible to provide a touch panel display device with high display quality by preventing curling of the liquid crystal panel unit and preventing malfunction of the touch panel by shielding electromagnetic waves.

  (13) The display device according to (10) to (12), wherein the conductive layer is grounded and the conductive film has an electromagnetic wave shielding function.

  According to (13), a display device having a more excellent electromagnetic wave shielding function can be obtained.

  (14) The display device according to any one of (10) to (13), wherein the primary light source is a white LED.

  According to (14), since the light emitted from the white LED is continuous and has a wide emission spectrum, it is effective in improving Nizimura and is also excellent in luminous efficiency. Therefore, the primary light source of the backlight in the present invention It is suitable as. In addition, since white LEDs with low power consumption can be widely used, an energy saving effect can also be achieved.

  Since the present invention has the above-described configuration, it is an optical laminate having electromagnetic wave shielding performance, which can prevent the occurrence of curling by suppressing the dimensional change with respect to humidity change, and sufficient shielding. A conductive optical laminate having performance and a display device including the same can be provided.

It is a schematic diagram with which it uses for description of the layer structure of the polarizing plate integrated conductive optical laminated body of this invention. It is a perspective view which shows typically the polarizing plate integrated conductive optical laminated body of this invention. It is sectional drawing which shows typically the touchscreen apparatus which is an example of a display apparatus provided with the polarizing plate integrated conductive optical laminated body of this invention.

  The present invention is described in detail below. In the present specification, unless otherwise specified, curable resin precursors such as monomers, oligomers, and prepolymers are also referred to as “resins”.

<Conductive optical laminate with integrated polarizing plate>
As shown in FIG.1 and FIG.2, the polarizing plate integrated conductive optical laminated body 1 of this invention is the thing in which the electroconductive film 11 and the polarizing element film 12 are laminated | stacked and integrated.

  Here, the conventional polarizing element film has a configuration in which a protective substrate such as a triacetylcellulose substrate is attached on the polarizing element. On the other hand, in the polarizing plate integrated conductive optical laminate 1, the conductive film 11 is directly attached to the polarizing element film 12. And the transparent base material 111 of the electroconductive film 11 serves as the role of the protective film of a polarizing element. As a result, the polarizing plate-integrated conductive optical laminate 1 can omit the conventional protective film for the polarizing element film and can reduce the thickness of the display device.

  The polarizing plate-integrated conductive optical laminate 1 includes a polarizing element film in which the direction of the slow axis of the transparent substrate 111 constituting the conductive film 11, that is, the direction having the largest refractive index in the plane of the transparent substrate, It is preferable that the layers are laminated so that the angle formed with the 12 absorption axes is 0 ° ± 30 ° or 90 ° ± 30 °, and more preferably in the range of 0 ° ± 10 ° or 90 ° ± 10 °. Preferably, it is in the range of 0 ° ± 7 ° or 90 ° ± 7 °, more preferably in the range of 0 ° ± 3 ° or 90 ° ± 3 °, and the angle is 0 ° or 90 °. It is most preferable that the conductive film 11 and the polarizing element film 12 are laminated so that When the angle formed by the direction of the slow axis of the transparent substrate 1111 and the absorption axis of the polarizing element film 12 is within the above range, it is possible to extremely highly suppress the occurrence of azimuth irregularities in the display image of the touch panel device 10. it can. The reason for this is not clear, but is thought to be due to the following reasons.

  That is, in an environment where there is no external light or fluorescent light (hereinafter, such an environment is also referred to as “dark place”), by setting the retardation of the transparent substrate 111 to 3000 nm or more, The occurrence of azimuth irregularities can be suppressed regardless of the angle between the slow axis direction of the transparent substrate 111 of the polarizing plate integrated conductive optical laminate 1 and the absorption axis of the polarizing element film 12. However, in an environment where there is ambient light or fluorescent light (hereinafter, this environment is also referred to as “light”), external light and fluorescent light have only a continuous wide spectrum. Therefore, if the angle formed between the direction of the slow axis of the transparent substrate 111 and the absorption axis of the polarizing element film 12 is not within the above-described range, nitrile occurs and the display quality is degraded. Furthermore, in the touch panel device 10 shown in FIG. 3, the light of the backlight 5 that has passed through the color filter 43 is not limited to having a continuous wide spectrum. If the angle formed with the absorption axis of the element film 12 is not within the above-described range, it is assumed that nitrimation occurs and the display quality deteriorates. In addition to the polarizing plate integrated conductive optical laminate 1 in the touch panel device 10, when a transparent substrate is further laminated as a protective film or the like at other positions, all the layers may fall within the above angle range. preferable.

  In particular, when it is necessary to visually recognize a display device such as the touch panel device 10 by using polarized sunglasses, in the polarizing plate integrated conductive optical laminate 1, the direction of the slow axis of the transparent substrate 111 and The angle formed with the absorption axis of the polarizing element film 12 is preferably laminated so as to be in the range of 45 ° ± 30 °. As a result, it is possible to effectively utilize the optical characteristics that prevent azimuth and to emit incident light by linearly polarized light with light having a linearly polarized component orthogonal thereto, and even when using polarized sunglasses, the display screen Can take a look.

  Here, the retardation means a refractive index (nx) in a direction having the largest refractive index (slow axis direction) in the plane of the transparent substrate and a direction (fast axis direction) orthogonal to the slow axis direction. The refractive index (ny) and the thickness (d) of the transparent substrate are represented by the following formula (Equation 4). The retardation can be measured, for example, by KOBRA-WR manufactured by Oji Scientific Instruments (measurement angle 0 °, measurement wavelength 548.2 nm).

(Equation 1)
Retardation (Re) = (nx−ny) × d

  Further, the transmittance of light transmitted between the polarizing plates when it is installed at a certain angle θ with respect to the polarizing plates arranged in crossed Nicols is expressed by the following formula (Equation 2). In the following formula (Equation 2), I represents the intensity of light transmitted between polarizing plates arranged in crossed Nicols, and I0 represents the intensity of light incident between polarizing plates arranged in crossed Nicols. In this case, when the angle (θ) formed by the direction of the slow axis of the transparent substrate 111 with respect to the absorption axis of the polarizing element film 12 is 45 °, the light transmittance is maximum, but the transmittance Changes depending on the retardation of the transparent substrate 111 and the wavelength of transmitted light, and therefore, interference colors peculiar to the retardation value (Nizimura etc.) are observed. Here, when the angle (θ) is set to 0 ° or 90 °, the light transmittance is zero, so that no interference color is observed.

(Equation 2)
I / I0 = sin ² 2θ · sin ² (πRe / λ)

  In addition, said slow axis direction is a direction of the average orientation angle | corner of the slow axis direction of the transparent base material calculated | required using the molecular orientation meter (MOA; Molecular Orientation Analyzer). Further, the orientation angle difference is obtained, for example, as a value obtained by subtracting the minimum value from the maximum value of the orientation angle measured using a molecular orientation analyzer (MOA) manufactured by Oji Scientific Instruments.

<Conductive film>
As shown in FIGS. 1 and 2, the conductive film 11 includes a transparent substrate 111 and a conductive layer 112 formed in a predetermined pattern on the transparent substrate 111.

  The transparent substrate 111 is a single-layer or multilayer transparent resin substrate, and has a dimensional change rate with respect to humidity (hereinafter also simply referred to as “dimensional change rate”) of 0.6% or less. When the dimensional change rate of the transparent substrate 111 exceeds 0.6%, when the polarizing plate integrated conductive optical laminate of the present invention is used for an LCD or the like, the dimensional change of the transparent substrate due to humidity change becomes large. Curling occurs in the LCD panel body. A preferable upper limit of the dimensional change rate is 0.3%, and a more preferable upper limit is 0.1%.

In this specification, the dimensional change rate with respect to humidity is 30 for a film sample cut into a predetermined size (for example, 5 mm × 20 mm) under a predetermined load condition (for example, 150 mN / mm ² ). The dimensional change rate when the temperature is changed from 30 ° C. to 90% RH from the state of 0% RH, and is calculated by the following equation (Equation 3).

  In the formula (Equation 3), “the dimension under the environment of 30 ° C. and 90% RH” and “the dimension under the environment of 30 ° C. and 0% RH” mean that the transparent substrate 111 is in the environment of 30 ° C. and 90% RH, respectively. The average value of the length between two predetermined points in the slow axis direction and the direction perpendicular to the slow axis direction after standing for a certain period of time at 30 ° C. and 0% RH. The fixed time may be a time that is necessary and sufficient for the dimensional change in a predetermined environment to settle. Moreover, the load condition to the film sample at the time of measuring the dimensional change rate is a condition for applying a certain load to stabilize the measurement of the dimension of the transparent substrate sample. However, the above load conditions are such that there is no elastic deformation or plastic deformation caused by applying a load to the transparent substrate sample, and that the conditions of the transparent substrate sample atmosphere are directly reflected in the dimensional change. Just load it.

  The transparent substrate 111 is preferably a resin substrate having a retardation of 3000 nm or more. If the retardation of the transparent substrate 111 is less than 3000 nm, it is not possible to sufficiently prevent the occurrence of azimuth irregularities in the display device. On the other hand, the upper limit of the retardation of the transparent substrate 111 is not particularly limited, but is preferably 30000 nm or less, more preferably about 20000 nm. If the thickness exceeds 30000 nm, no further improvement in the effect of improving the display image is observed, and the film thickness becomes considerably thick.

  The transparent substrate 111 may be composed of a single layer substrate, or may be composed of a multilayer substrate in which a plurality of single layer substrates are laminated. When the transparent substrate 111 is made of a multilayer substrate, the substantial retardation of the entire multilayer substrate may be 3000 nm or more. In this case, each layer has a retardation of 400 nm or more and less than 3000. Preferably no material is included. If transparent base materials containing retardation in this range are mixed in the layer structure, the effect of preventing the occurrence of azimuth will be reduced.

  In the transparent substrate 111, “nx−ny” (hereinafter also referred to as Δn) in the above formula (Equation 1) is preferably 0.05 or more. If Δn is less than 0.05, there may be a case where a sufficient inhibitory effect on azimuth cannot be obtained. Moreover, since the film thickness required in order to obtain the retardation value mentioned above becomes thick, it is not preferable. A more preferable lower limit of Δn is 0.07.

  The material constituting the transparent substrate 111 is not particularly limited as long as the dimensional change rate with respect to the humidity defined by the above formula (Equation 4) is 0.6% or less, but the retardation is 3000 nm or more. Is more preferable. For example, as a resin that satisfies the above dimensional change rate requirement, polyester resin, polyolefin resin, (meth) acrylic resin, polyurethane resin, polyethersulfone resin, polycarbonate resin, polysulfone resin, polyether One type selected from the group consisting of a series resin, a polyether ketone series resin, a (meth) acrylonitrile series resin, and a cycloolefin series resin can be used.

  Moreover, as a material which comprises the transparent base material 111, it is especially preferable to consist of polyethylene terephthalate (PET) among the above. This is because polyethylene terephthalate is highly versatile and easily available. PET is excellent in light transmittance, heat or mechanical properties, can be controlled by stretching, has a large intrinsic birefringence, and even if the film thickness is small, preferable retardation of 3000 nm or more is relatively easy. It is because it is obtained. PET also has a characteristic that it is superior in converting properties such as material adhesion compared to other base materials such as cyclic polyolefin, acrylic, and TAC.

  In addition, since the thermal contraction rate by PET is small, the restriction | limiting of the heating conditions at the time of a processing process is small. Therefore, the point which can raise the freedom degree of selection of the manufacturing method of conductive film 11 is preferred. For example, when the conductive layer 112 is formed, a printing process using a thermosetting resin as a binder can be employed under a wide range of heating conditions. Thereby, selection for forming the conductive layer 112 having high shielding performance more easily at low cost becomes possible. Further, for example, when grounding from the electromagnetic wave shielding sheet to the housing, a simple and highly durable treatment such as thermocompression bonding can be performed by using a PET film as a material. As described above, the conductive film 11 can cause the display device to exhibit higher display quality while suppressing the manufacturing cost by using a highly versatile PET film as the material of the transparent substrate 111. Is.

  In addition to PET, the dimensional change rate according to the above formula (Equation 3) is small, and other resins that can be particularly preferably used as the transparent substrate 111 are acrylics having the dimensional change rate of about 0.04%. Examples thereof include a resin and a cyclic polyolefin resin (COP).

  In addition, the transparent base material 111 is obtained by performing stretching in the flow direction with respect to the transverse stretching (hereinafter, also referred to as “longitudinal stretching”) after lateral stretching of the unstretched polyester using a biaxial stretching test apparatus. It may be. In this case, the longitudinal stretching preferably has a stretching ratio of 2 times or less. When the draw ratio of the above-mentioned longitudinal stretching exceeds twice, the value of Δn may not be within the preferred range described above. The treatment temperature during the heat treatment is preferably 100 to 250 ° C, more preferably 180 to 245 ° C.

  Examples of the method for controlling the retardation of the transparent substrate 111 to 3000 nm or more include a method of appropriately setting the stretching ratio, the stretching temperature, and the film thickness of the transparent substrate to be formed. Specifically, for example, the higher the stretching ratio, the lower the stretching temperature, and the thicker the film, the easier it is to obtain high retardation. The lower the stretching ratio, the higher the stretching temperature, and the film thickness. The thinner, the easier it is to obtain low retardation.

  The thickness of the transparent substrate 111 is appropriately determined according to the constituent material and the like, but is preferably in the range of 20 to 500 μm. If the thickness is less than 20 μm, the retardation of the transparent substrate 111 may not be 3000 nm or more, and the anisotropy of the mechanical properties becomes remarkable, and it is easy to cause tearing, tearing, etc. May decrease. On the other hand, if it exceeds 500 μm, the transparent substrate is very rigid, the flexibility specific to the polymer film is lowered, and the practicality as an industrial material is also lowered, which is not preferable. A more preferable lower limit of the thickness of the transparent substrate 111 is 30 μm, a more preferable upper limit is 400 μm, and an even more preferable upper limit is 300 μm.

  The transparent substrate 111 preferably has a transmittance in the visible light region of 80% or more, and more preferably 84% or more. In addition, the said transmittance | permeability can be measured by JISK7361-1 (The test method of the total light transmittance of a plastic-transparent material).

  The transparent substrate 111 preferably has a difference in orientation angle in the slow axis direction of each substrate within 6 °, more preferably within 4 °, and further preferably within 2 °. . Since the polarization angle difference of the transparent substrate 111 is within 6 °, as will be described later, in the touch panel device 10, the angle formed by the absorption axis of the polarizing plate 3 and the direction of the slow axis of the transparent substrate 111 is 0. In particular, it is possible to prevent the occurrence of Nijimura when installed at an angle of 90 °. This is because when there is a large alignment angle difference exceeding 6 ° between the plurality of transparent base materials 111, the light transmittance is increased and interference color is generated.

  The conductive layer 112 can be formed by patterning an opaque conductive layer to form a “substantially transparent pattern” by the presence of openings. As the opaque conductive layer, a conductive metal can be used in addition to carbon and a conductive polymer, and silver, copper, gold, aluminum, and the like are preferably used. The metal layer may be a single metal or alloy, or may be one in which metal particles are bound by a binder. Further, blackening treatment or rust prevention treatment is applied to the metal surface as necessary. The “substantially transparent pattern” in the present invention refers to a pattern that appears to be transparent by providing the opening as described above, for example.

  When the conductive layer 112 is a substantially transparent pattern, the pattern shape in plan view is typically a mesh (mesh or lattice) shape, but other than that, a stripe (parallel line group or stripe pattern) shape. A spiral shape or the like is also used. In the case of a mesh shape, the unit cell shape may be a triangle such as a regular triangle or an unequal side triangle, a square such as a square, rectangle, trapezoid or rhombus, a polygon such as a hexagon or octagon, a circle or an ellipse. Used. Further, for the purpose of reducing moire, a random mesh pattern or a pseudo-random mesh pattern can be used. The line width and the inter-line pitch may be dimensions that are usually employed. For example, the line width can be 3 to 50 μm, and the line-to-line pitch can be 100 to 5000 μm. In addition, it is preferable that it is 1000-5000 micrometers from a viewpoint of making the light transmittance of the electroconductive layer 112 and the surface resistivity which demonstrates a detail below compatible on a higher level. The light transmittance is usually 90% or more. In addition to the predetermined pattern, there may be a ground pattern such as all solids (no openings) adjacent to the periphery of the peripheral part or a part of the peripheral part while maintaining electrical continuity therewith. Note that the line width is required to be further refined in order to obtain a more transparent and invisible one. From this viewpoint, it is preferably 15 μm or less, particularly preferably 8 μm or less. The pitch and bias angle of the pattern are preferably optimized each time in order to reduce moire according to the pixel arrangement of the display device to be applied.

  The thickness of the conductive layer 112 varies depending on the resistance value provided in the conductive layer 112, but at the center portion (the top portion of the protrusion pattern) from the balance between the conductive performance and the adhesion suitability of other members on the conductive layer 112. In this measurement, it is usually from 0.1 μm to 50 μm, preferably from 0.5 μm to 10 μm.

  When the conductive layer 112 has a substantially transparent pattern, pattern printing, photolithography (etching) after the formation of the opaque conductive layer on the surface, transfer, self-organization, etc. can be applied. is there. From the viewpoint of improving cost performance, it is particularly preferable to form by pattern printing. Pattern printing methods include a method of printing a conductive composition in a predetermined pattern, a method of printing a material having a catalytic function of electroless plating on a predetermined pattern, and electroless plating of a conductive metal, and electroless plating. Examples include a method of adding a catalyst and performing electroless plating after printing a material forming the catalyst and the adduct. Examples of the conductive composition include silver paste, copper paste, and conductive polymer. Examples of the material having a catalytic function include ink containing catalyst particles such as palladium and particles having catalyst particles supported on the surface. Examples of the material that forms the adduct with the catalyst include ink containing silver or a conductive polymer. Examples of the metal forming the electroless plating layer include conductive metals such as copper, nickel, and silver.

  Although any method can be applied as the pattern printing method depending on the required pattern accuracy, screen printing, intaglio offset printing, a method of transferring from the intaglio using a UV curing primer, or the like is preferably used.

  When the conductive layer 112 is patterned by a conductive composition containing metal particles and a binder resin by pattern printing, the metal particles can be used as long as they have conductivity, as exemplified above. The conductive layer 112 may be a single metal or alloy, or may be formed by binding metal particles with a binder. As the binder resin, any of thermosetting resins, ionizing radiation curable resins, and thermoplastic resins can be used. In addition, when performing the below-mentioned electrical resistance reduction process, the water-insoluble resin which does not melt | dissolve with an acid or warm water is used.

  Examples of binder resins that can be used for pattern printing include thermosetting resins such as melamine resins, polyester-melamine resins, epoxy-melamine resins, phenol resins, polyimide resins, thermosetting acrylic resins, thermosetting resins. Examples of the resin include polyurethane resins and thermosetting polyester resins. Examples of the ionizing radiation curable resin include those described later as the material for the primer. These may be used alone or in combination of two or more. Used by mixing. Examples of the thermoplastic resin include thermoplastic polyester resins, polyvinyl butyral resins, thermoplastic acrylic resins, thermoplastic polyurethane resins, vinyl chloride-vinyl acetate copolymers, and the like. A mixture of two or more types is used. In addition, when using a thermosetting resin, you may add a curing catalyst as needed. When an ultraviolet (or visible light) curable ionizing radiation curable resin is used, a photopolymerization initiator may be added as necessary. Further, in order to obtain fluidity suitable for filling the concave portion of the plate, these resins are usually used as a varnish dissolved in a solvent. There is no particular limitation on the type of solvent used as the conductive paste, and it can be used by appropriately selecting from the solvents generally used for printing inks. However, when a primer layer is provided, the stable hardening of the primer layer is inhibited. And those that do not swell, whiten or dissolve the cured primer layer. The content of the solvent is usually about 10 to 70% by mass, but is preferably as small as possible within a range where necessary fluidity can be obtained. In addition, when an ionizing radiation curable resin is used, it does not necessarily require a solvent because it is inherently fluid.

  The conductive layer 112 can also be formed on the transparent substrate 111 as a conductive film made of a transparent conductive material. In this case, as the transparent conductive material, ITO, conductive nanowires made of a material such as silver, conductive carbon nanotubes or graphene, conductive polymers, or the like can be used. In the case of using a transparent conductive material, it is not always necessary to increase the transmittance by the above-described pattern shape, that is, a fine pattern, and a conductive layer formed on the entire surface can be used.

The conductive layer 112 may have a surface resistivity of 10 ⁵ Ω / □ or less, and is preferably 10 ² Ω / □ or less. By setting the surface resistivity of the conductive layer 112 to 10 ⁵ Ω / □ or less, for example, when the insulating layer is disposed under the touch panel portion or at a position below the cover glass, etc. Necessary electromagnetic wave shielding performance required according to a necessary arrangement location can be sufficiently satisfied. Thereby, it becomes possible to arrange freely without requiring adjustment of the shielding performance depending on the arrangement location. In general, an expensive ITO sputtered layer or the like that needs to be separately provided as an electromagnetic wave shielding layer on the (glass plate) of the LCD panel unit can be eliminated. When the surface resistivity of the conductive layer 112 is 10 ² Ω / □ or less, a conductive mesh made of metal or metal particles can be suitably used.

  The conductive layer 112 is more preferably grounded to a terminal having a ground function such as a frame portion through a conductive flat flexible cable, a conductive gasket, and other conductive parts such as soldering. With this configuration, the electromagnetic wave shielding function of the conductive film 11 can be further enhanced. In addition, with this configuration, it is possible to suppress breakage and poor contact between the conductive layer 112 and the grounding conductive component due to dimensional changes due to moisture absorption, and to provide a stable electromagnetic wave shielding function.

  In the conductive film 11, it is preferable to provide a primer layer (not shown) between the transparent substrate 111 and the conductive layer 112 in order to improve the adhesion between the transparent substrate 111 and the conductive layer 112. The primer layer has good adhesion to both the transparent substrate 111 and the conductive layer 112, and is a transparent layer for ensuring light transmission of the opening (conductive pattern layer non-formed part). Furthermore, when the conductive layer 112 is formed by a specific intaglio printing method as described later, the primer layer is provided on the transparent substrate 111 in a state where fluidity can be maintained, and is in contact with the intaglio at the time of intaglio printing. During this time, the layer is formed as a layer to be solidified from the liquid state, and is a layer solidified when the final conductive layer 112 is formed.

  The material constituting the primer layer is not particularly limited in nature, but in the present invention, a specific intaglio printing method as described below is recommended as a method for forming the conductive layer 112, so that the primer layer is also liquid in an uncured state. A layer formed by coating and curing (solidifying) an ionizing radiation curable composition containing a (fluid) ionizing radiation polymerizable compound is preferably used.

  In addition, in the electroconductive film 11, you may perform formation of another layer, or a process suitably as needed. For example, when the durability against rust is insufficient, a rust prevention layer may be provided. The rust preventive layer can be provided by a conventionally known material and method.

<Polarizing element film>
The polarizing element film 12 is not particularly limited as long as it has a desired polarization characteristic, and those generally used for a polarizing plate of a liquid crystal display device can be used. Specifically, for example, a polyvinyl alcohol film is stretched, and a polarizing plate containing iodine is preferably used. It does not specifically limit as a polyvinyl alcohol-type film, The polyvinyl alcohol-type film normally used can be used. For example, what extended | stretched uniaxially the polyvinyl alcohol film, the polyvinyl formal film, the polyvinyl acetal film, the poly (ethylene-vinyl acetate) copolymer film, etc. are mentioned. The thickness of the polyvinyl film is not particularly limited, and for example, a thickness of about 5 to 150 μm is used.

  In the polarizing element film 12, a protective layer is preferably laminated on the surface opposite to the surface on which the conductive film 11 is laminated. Although it does not specifically limit about this protective layer, For example, the transparent base material same as the transparent base material 111 can be preferably used as a base material which forms a protective layer.

<Method for Producing Polarizing Plate-Integrated Conductive Optical Laminate>
The polarizing plate-integrated conductive optical laminate 1 includes a transparent base material forming step in which a base resin is formed into a film to form a transparent base material 111, and a conductive composition is formed on the transparent base material 111 in a predetermined shape. It is manufactured by a manufacturing method including a conductive layer forming step of forming the conductive layer 112 to form the conductive film 11 and a polarizing plate integration step of integrating the conductive film 11 and the polarizing element film 12. it can.

[Transparent substrate forming step]
In this step, first, a material resin such as polyethylene terephthalate is melted, and an unstretched film is formed by a known extrusion method. And if necessary, this unstretched film is stretched sequentially at different magnifications in the X and Y directions with a biaxial stretching test apparatus. About each draw ratio, what is necessary is just to adjust suitably in the range demonstrated above. By the above operation, a preferable transparent substrate 111 having a retardation of 3000 nm or more can be obtained.

[Conductive layer forming step]
In this step, the conductive layer 112 is formed on at least one surface of the transparent substrate 111 using a conductive composition (conductive paste) containing metal particles and a binder resin.

  The predetermined pattern of the conductive layer 112 can be formed by various known printing methods such as silk screen printing, flexographic printing, and offset printing.

  In order to improve the adhesion between the transparent substrate 111 and the conductive layer 112, when a primer layer is provided between the transparent substrate 111 and the conductive layer 112, as a method for producing the conductive member, for example, Intaglio printing using a specific primer described in a published patent document (WO2008 / 149969 pamphlet) is recommended.

  The conductive layer 112 can also be formed by a method of patterning a metal foil by an etching process. In this case, a copper foil can be preferably used as the metal foil. As a specific manufacturing method, a copper foil is dry-laminated on a transparent substrate 111 via a primer layer to form a continuous strip-shaped copper foil laminated sheet, and then photolithography is performed on the copper foil of the copper foil laminated sheet. The conductive layer 112 can be formed by performing a chemical etching process using a method. In particular, when a line width of less than 10 μm is required, it can be achieved preferably by using a metal foil having a thickness corresponding to the line width, and a thin metal layer having a thickness of 2 μm or less is formed on the transparent substrate 111. A film formed by vapor deposition or sputtering may be similarly patterned by photolithography.

<Touch panel type display device>
Next, with reference to FIG. 3, a touch panel device 10 which is a touch panel type display device that is a preferred embodiment of a display device in which the polarizing plate integrated conductive optical laminate 1 is arranged will be described. The display device of the present invention has the polarizing plate integrated conductive optical laminate 1 and the liquid crystal panel unit 4 as essential constituent elements, and other constituent members are not necessarily required. The touch panel device 10 including the integrated conductive optical laminate 1, the liquid crystal panel unit 4, and other constituent members will be described.

  As illustrated in FIG. 3, the touch panel device 10 includes a touch panel unit 2, a polarizing plate integrated conductive optical laminate 1, a polarizing plate 3, and a liquid crystal in order from an upper surface side that is a surface on which a user recognizes an image or the like. The panel units 4 are stacked in this order, and a backlight 5 is disposed below the liquid crystal panel unit 4.

  The touch panel device 10 has a configuration in which an arbitrary layer having other functions is formed within a range that does not impair the electromagnetic wave shielding performance of the polarizing plate integrated conductive optical laminate 1 and the display function of the touch panel device 10. May be. The optional layer is not particularly limited, and examples thereof include a hard coat layer, an antistatic layer, a low refractive layer, a high refractive index layer, an antiglare layer, an antifouling layer, an antireflection layer, a high dielectric layer, and an electromagnetic wave shielding layer. And an adhesive layer.

  The details of the polarizing plate-integrated conductive optical laminate 1 are as described above, but are laminated on the upper surface (surface on the light-emitting surface side) of the liquid crystal panel unit 4 as shown in FIG.

  As the touch panel unit 2, a known touch panel unit having a configuration in which a sensor film in which a conductive pattern in the x direction or a conductive pattern in the y direction is formed on a film of PET or the like is sequentially laminated on a glass plate can be used. . The touch panel unit 2 may have a configuration in which any other layer is formed as a single layer and / or multiple layers on the sensor film. The optional layer is not particularly limited, and examples thereof include a hard coat layer, an antistatic layer, a low refractive layer, a high refractive index layer, an antiglare layer, an antifouling layer, an antireflection layer, a high dielectric layer, and an adhesive layer. Etc.

  The liquid crystal panel unit 4 is not particularly limited, and generally known liquid crystal panel units for liquid crystal display devices can be used. For example, as shown in FIG. 1, a liquid crystal panel unit 4 having a general structure in which a liquid crystal layer 41 is sandwiched between glass plates 42 and a color filter 43 is disposed on the upper surface thereof, specifically, TN, STN, Display systems such as VA, IPS, and OCB can be used.

  The color filter 43 is not particularly limited, and for example, generally known color filters for liquid crystal display devices can be used. Such a color filter is usually composed of transparent colored patterns of red, green and blue, and each transparent colored pattern is made of a resin composition in which a colorant is dissolved or dispersed, preferably pigment fine particles are dispersed. Composed. The color filter may be formed by adjusting an ink composition colored in a predetermined color and printing it for each colored pattern. However, a paint type photosensitive material containing a colorant of a predetermined color may be used. It is more preferable to carry out by a photolithography method using a conductive resin composition.

  Further, the liquid crystal panel unit 4 may have a structure in which the upper and lower surfaces of the liquid crystal panel unit 4 are sandwiched between two polarizing plates. In this case, the polarizing plate 3 is provided on the side surface opposite to the color filter 43 of the liquid crystal panel unit 4. Or you may further arrange | position the polarizing plate integrated conductive optical laminated body 1 also in this position. Thus, when a some polarizing plate is laminated | stacked in the touchscreen apparatus 10, these several polarizing plates are normally arrange | positioned so that a mutual absorption axis may be 90 degrees (cross Nicol).

Further, since the liquid crystal panel unit 4 is also a source of electromagnetic waves, generally, an ITO sputter layer as described above is provided on the glass plate 42 on the light emitting surface side of the liquid crystal panel unit 4 in order to shield the electromagnetic waves. In the touch panel device 10, this layer is replaced with the polarizing plate-integrated conductive optical laminate 1, or the surface resistivity of the conductive layer 112 is 10 ² Ω / □ at another position. By disposing the polarizing plate-integrated conductive optical laminated body 1 as described below, it is possible to eliminate the need for the shielding layer itself disposed at this position and to dispose the shielding layer.

  The primary light source of the backlight 5 is not particularly limited, but is preferably a white light emitting diode (white LED). The white LED is an element that emits white by combining a phosphor with a phosphor type, that is, a light emitting diode that emits blue light or ultraviolet light using a compound semiconductor. Above all, white light-emitting diodes, which consist of light-emitting elements that combine blue light-emitting diodes using compound semiconductors with yttrium, aluminum, and garnet yellow phosphors, have a continuous and broad emission spectrum. Therefore, it is suitable as a primary light source of the backlight in the present invention. Further, since white LEDs with low power consumption can be widely used, it is possible to achieve an energy saving effect.

  The display image of the touch panel device 10 is displayed in color as light emitted from the primary light source of the backlight 5 passes through the color filter 43. However, when the light transmitted through the color filter 43 is controlled so as to be displayed in a single color, when a conventionally used oriented polyester film is used as a transparent substrate disposed at a position where the light beam is transmitted, Nidimra is more effective. It may occur strongly. On the other hand, the touch panel device 10 including the polarizing plate-integrated conductive optical laminated body 1 suitably generates the azimuth unevenness due to the optical characteristics of the transparent substrate 111 even when such a monochromatic display is used. Can be suppressed.

  As described above, as a preferred embodiment of the present invention, the touch panel device 10 in which the polarizing plate integrated conductive optical laminate 1 is arranged in a touch panel type display device including a liquid crystal display (LCD) has been described. The polarizing plate-integrated conductive optical laminate 1 can be particularly preferably used for a transparent antenna of the touch panel device 10, a transparent antenna provided in a mobile phone, and the like. By including the polarizing plate-integrated conductive optical laminate 1, in the touch panel device 10, it is possible to prevent erroneous touch detection and malfunction due to touch recognition lock caused by abnormality detection, and image noise due to malfunction of the LCD drive circuit. And image distortion can be prevented.

  In addition, the polarizing plate integrated conductive optical laminate 1 is not limited to the above-described application, and can be used for other various applications. Plasma used in various television receivers, display units for measuring instruments and instruments, display units for office equipment and computers, display units for telephones, display units for game machines, lighting signs (lighting advertisements), etc. It can be preferably used for a front-installed electromagnetic wave shielding filter of an image display device such as a display (PDP), a cathode ray tube display (CRT), a liquid crystal display (LCD), an electroluminescent display (EL) or the like. In addition, it can also be used for electromagnetic wave shielding filter applications such as building windows, vehicles, ships, aircraft, or microwave oven windows.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example. In this specification, “part” and “%” are based on mass unless otherwise specified.

  Moreover, the dimensional change rate and retardation of the transparent base material used by the Example and the comparative example were measured as follows.

<Dimensional change rate measurement>
It measured using the thermomechanical analyzer (TMA / SS6000 by SII), and the circulation tank for humidity generation (PHOENIX II C25P by THERMO). Specifically, a 5 mm × 20 mm film sample was cut out from the transparent substrate, and the dimensions when the film sample was held for 300 min in a 30 ° C. 0% RH environment under a load condition of 150 mN / mm ² , The dimensions when held for 300 min in a 30 ° C. and 90% RH environment were measured, and the dimensional change rate was calculated from these values using the above equation (Equation 4). The measurement direction is a slow axis direction and a direction perpendicular to the slow axis direction, and is an average value.

<Measurement of retardation>
The retardation of the light transmissive substrate having a retardation value of less than 1000 nm was measured using KOBRA-WR manufactured by Oji Scientific Instruments. The retardation of the light-transmitting substrate having a retardation value exceeding 1000 nm was measured as follows.
First, the stretched light-transmitting substrate is obtained by using two polarizing plates to determine the orientation axis direction of the light-transmitting substrate, and the refractive index with respect to a wavelength of 590 nm of two axes orthogonal to the orientation axis direction. (Nx, ny) was determined by an Abbe refractometer (NAR-4T manufactured by Atago Co., Ltd.). Here, an axis showing a larger refractive index is defined as a slow axis. The thickness d (nm) of the light-transmitting substrate was measured using an electric micrometer (manufactured by Anritsu), and the unit was converted to nm. Retardation was calculated from the product of refractive index difference (nx−ny) and film thickness d (nm).

Example 1
<Preparation of polarizing plate integrated conductive optical laminate>
The polarizing plate integrated conductive optical laminate used in the touch panel device of Example 1 was prepared by the following steps.
[Transparent substrate formation]
The polyethylene terephthalate material was melted at 290 ° C., extruded through a film-forming die, into a sheet form, closely contacted on a water-cooled and cooled rotary quenching drum, and cooled to form an unstretched film. This unstretched film was preheated at 120 ° C. for 1 minute with a biaxial stretching test apparatus (manufactured by Toyo Seiki Co., Ltd.), and then stretched at 120 ° C. at a stretch ratio of 4.5 times. The film was stretched at a stretching ratio of 1.5 times in the direction of degree to obtain a transparent substrate having retardation = 3300 nm, film thickness = 33 μm, Δn = 0.099, and dimensional change rate 0.07%.

[Conductive layer formation]
The above transparent substrate was coated with a liquid primer made of an ultraviolet curable resin composition having the following composition to a thickness of 14 μm by a diagonal gravure reverse roll coating method.
Epoxy acrylate prepolymer: 35 parts by weight Urethane acrylate prepolymer: 12 parts by weight Monofunctional acrylate monomer comprising phenoxyethyl acrylate: 44 parts by weight Trifunctional acrylate monomer comprising ethylene oxide-modified isocyanuric acid triacrylate: 9 parts by weight Photopolymerization initiator 1 -Hydroxy-cyclohexyl-phenyl-ketone (trade name Irgacure 184 manufactured by Ciba Specialty Chemicals): 3 parts by mass

Next, a silver paste ink having the following composition was prepared as a conductive composition.
(Composition of conductive composition (silver paste))
Metal particles (silver particles having an average particle diameter of 1 μm): 93 parts by mass Binder resin (thermoplastic polyester urethane resin): 7 parts by mass Solvent (butyl carbitol acetate): 25 parts by mass

  As the intaglio, the above intaglio roll having a square lattice with a plate concave pattern having a line width of 5 μm and a pitch of 3200 μm and a plate depth of 25 μm was used. The silver paste ink filled in the filling container is coated on the plate surface with a pick-up roll, and the plate surface on which the excess ink is scraped off with a doctor blade and the primer layer side of the transparent substrate on which the primer layer is formed are pressure-bonded with a nip roll. Subsequently, the UV curable resin of the primer layer was cured while traveling between the UV irradiation zones where the high-pressure mercury lamp was arranged. Thereafter, the film is peeled from the intaglio roll by the nip roll on the outlet side, and the conductive composition layer is transferred and formed on the primer layer. The transfer film thus obtained is passed through a drying zone at 120 ° C. to evaporate the solvent of the silver paste, and a conductive layer composed of a mesh pattern is formed on the primer layer. A body conductive film was obtained.

  Next, as an electrical resistance reduction treatment, the conductive member was left for 48 hours in an atmosphere having a temperature of 80 ° C. and a relative humidity of 90%, and then taken out into a room temperature atmosphere (temperature 23 ° C., relative humidity 50%). The thickness of the printed conductive pattern layer (measured with reference to the surface of the primer layer of the non-mesh portion) is 23 μm, and the transfer rate calculated by the ratio of the plate depth to the printing thickness is (mesh pattern thickness 23 μm / plate Depth 25 μm) × 100 = 92%. The thickness of the printed conductive pattern layer (measured with reference to the surface of the primer layer of the non-mesh portion) is 23 μm, and the transfer rate calculated by the ratio of the plate depth to the printing thickness is (mesh pattern thickness 23 μm / plate The depth was 25 μm) × 100 = 92%, but in reality, there was a flow after the silver paste ink was transferred and volumetric shrinkage due to solvent drying. Presumed.

  The pattern shape of the active area (image display region) in the conductive film of the example obtained as described above was a shape in which lattice-like patterns were arranged in a lattice shape, the line width was 5 μm, and the opening pitch was 3200 μm.

[Integrated polarizing element film]
A polarizing element film and a polarizer protective sheet were bonded to the conductive film in this order to prepare a polarizing plate integrated conductive optical laminate. The polarizing element film includes a step of uniaxially stretching a PVA film, a step of dyeing the PVA film with a dichroic dye and adsorbing the dichroic dye, and a PVA film on which the dichroic dye is adsorbed. A step of treating with an aqueous boric acid solution, a step of washing with water after the treatment with an aqueous boric acid solution, and a uniaxially stretched PVA-based film in which these steps are adsorbed and oriented to form a polarizing element film, a conductive film Was manufactured through a process of attaching a polarizer protective sheet to one surface of the polarizing element film and the other surface. As the polarizer protective sheet, a triacetyl cellulose base material (TD80ULM manufactured by Fuji Film Co., Ltd.) having a film thickness of 80 μm and a dimensional change rate of 0.76% was used. In addition, in the polarizing plate integrated conductive optical laminate of Example 1, the angle formed by the slow axis direction of the transparent base material of the conductive film and the absorption axis of the polarizing plate element film is 0 °. Arranged.

<Create touch panel device>
Next, the obtained polarizing plate-integrated conductive optical laminate was placed on the surface of the observer side of the liquid crystal monitor (FLATRON IPS226V (LG Electronics Japan)), and a touch panel device was created.

(Example 2)
A transparent substrate made of an acrylic resin was used as the transparent substrate. This transparent substrate has in-plane retardation = 1.2 nm, film thickness = 80 μm, Δn = 0.000015. The dimensional change was 0.44%. A polarizing plate-integrated optical laminate was produced in the same manner as in Example 1 except that the transparent substrate made of this acrylic resin was used.

(Example 3)
A touch panel device is produced in the same manner as in Example 1 except that the angle formed by the direction of the slow axis of the transparent substrate and the absorption axis of the polarizing element film in the polarizing plate-integrated conductive optical laminate is 30 °. did.

Example 4
A touch panel device is produced in the same manner as in Example 1 except that the angle formed by the direction of the slow axis of the transparent substrate and the absorption axis of the polarizing element film in the polarizing plate integrated conductive optical laminate is 60 °. did.

(Example 5)
A touch panel device is produced in the same manner as in Example 1 except that the angle formed by the direction of the slow axis of the transparent substrate and the absorption axis of the polarizing element film in the polarizing plate-integrated conductive optical laminate is 90 °. did.

(Example 6)
A touch panel device is produced in the same manner as in Example 1 except that the angle formed by the direction of the slow axis of the transparent substrate and the absorption axis of the polarizing element film in the polarizing plate-integrated conductive optical laminate is 45 °. did.

(Example 7)
Instead of the transparent substrate in Example 1, the following transparent substrate was used. About the others, the touchscreen apparatus was produced by the method similar to Example 1. FIG. The transparent base material used in this Example 7 is a transparent base material with retardation = 2800 nm, film thickness = 100 μm, Δn = 0.028 obtained by adjusting the draw ratio in the production of the transparent base material in Example 1. is there. The dimensional change rate of this transparent substrate was 0.10%.

(Comparative Example 1)
Instead of the transparent substrate in Example 1, a triacetylcellulose substrate (TD80ULM manufactured by Fuji Film Co., Ltd.) was used as the transparent substrate. This transparent substrate had retardation = 5.6 nm, film thickness = 80 μm, Δn = 0.00007, and dimensional change rate 0.76%. A touch panel device was produced in the same manner as in Example 1 except that this transparent substrate was used.

<Curl evaluation>
In the touch panel device prepared in each example and comparative example, the member integrated with the polarizing plate integrated conductive optical laminate and the liquid crystal cell was allowed to stand for 1 week at 30 ° C. and 60% RH. It was measured. The curl was measured by placing the convex surface of the curl on a horizontal table and measuring the height from the table to the end surface with the largest curl. The curl is indicated by a value C / S obtained by dividing the curl value by the inch size of the liquid crystal monitor, and the value was evaluated according to the following criteria.
A: C / S <0.002.
B: 0.002 ≦ C / S <0.005.
C: C / S ≧ 0.005

<Nizimura evaluation>
The touch panel devices created in Examples 1 to 7 and Comparative Example 1 were visually observed from the front and oblique directions (about 50 degrees) by five people in a dark place and a bright place (liquid crystal monitor peripheral illumination 400 lux). In the bright place, the display image was further observed through polarized sunglasses, and the presence or absence of nidimra was evaluated according to the following criteria.
A: Nizimura is not observed.
B: Nizimura is observed, but it is thin and has no problem in practical use.
C: Nizimura is observed.
D: Nizimura is strongly observed.

  In addition, as an example closer to the actual product, when the image display was performed by incorporating each member of the example after the curl evaluation test and the comparative example into the touch panel device, the dimensional change rate was 0.6% or less. In any of the touch panel devices of the examples using the base material, no deterioration in display quality such as moire and luminance unevenness was observed, but in the touch panel device of the comparative example having a large dimensional change rate, there was a slight luminance. Unevenness, undulation of the displayed image visually, and light leakage from the lower backlight were observed from the edge of the screen.

  Moreover, it turns out that the touch panel apparatus of the Example which laminated | stacked the polarizing plate integrated conductive optical laminated body can suppress a nidimla by using the transparent base material whose retardation is 3000 nm or more. The touch panel device in which the angle formed by the slow axis of the transparent substrate and the absorption axis of the polarizing element film in the polarizing plate integrated conductive optical laminate is in the range of 0 ° ± 30 ° or 90 ° ± 30 °, It was excellent in visual evaluation of Nijimura in a light place and a dark place. On the other hand, the touch panel device according to Example 6 in which the same angle was 45 ° was inferior to the Nizimura evaluation through the polarized sunglasses in the bright place, but the Nizimura evaluation in the dark place was good. There is a practically preferable range in which Nijimura can be suppressed.

(Modification)
A touch panel device produced by the same method as in Example 1 except that the angle formed between the slow axis of the transparent substrate and the absorption axis of the polarizing element film in the polarizing plate-integrated conductive optical laminate is an arbitrary angle. With respect to the above, it is possible to suppress Nizimura within a practically preferable range when used in a dark place.

  As described above, from the examples, the polarizing plate integrated conductive optical laminate of the present invention and the touch panel device using the same can be applied to touch panel devices that can extremely highly suppress the occurrence of nitrile on the screen and require high quality. I can understand that you can.

<Electromagnetic wave shielding performance evaluation>
The electromagnetic wave shielding performance of the polarizing plate-integrated conductive optical laminate of Example 1 was evaluated.
That is, first, as a television receiver, a product obtained by removing an existing front filter from WOOO (trade name, manufactured by Hitachi, Ltd.) is prepared, and the polarizing plate integrated conductivity of Example 1 is formed on the surface of the front glass plate. The conductive film used for the optical laminate was attached. Then, a conductive film exposed to the peripheral edge was grounded, and prepared as an evaluation television receiver for Example 1.

  As for the electromagnetic wave shielding property, the result of measuring the electromagnetic wave shielding characteristics using an evaluation television receiver using an electromagnetic wave shielding material evaluation apparatus (manufactured by Advantest Co., Ltd., TR17301A) is about −30 dB or less in the range of 200 to 600 MHz. Those having shielding properties were evaluated as “good”, and those having shielding properties higher than about −30 decibels were evaluated as “bad”.

  The evaluation result was “good”.

  As described above, the polarizing plate-integrated conductive optical laminate of the present invention exhibits excellent electromagnetic shielding properties in display devices represented by touch panel type liquid crystal display devices, and improves the quality of images and the like of display devices. It can be seen that it is a thing that can greatly contribute.

DESCRIPTION OF SYMBOLS 1 Polarizing plate integrated conductive optical laminated body 11 Conductive film 111 Transparent base material 112 Conductive layer 12 Polarizing element film 2 Touch panel unit 3 Polarizing plate 4 Liquid crystal panel unit 41 Liquid crystal layer 42 Glass plate 43 Color filter 5 Backlight 10 Touch panel device

Claims (14)

A conductive film in which a conductive layer is laminated on a transparent substrate;
A polarizing element integrated conductive optical laminate in which a polarizing element film is laminated,
The transparent substrate is a polarizing plate integrated conductive optical laminate having a dimensional change rate with respect to humidity of 0.6% or less.   The polarizing plate-integrated conductive optical laminate according to claim 1, wherein the transparent substrate has a retardation of 3000 nm or more.   The transparent base material has a refractive index (nx) in the direction of the slow axis, which is the direction having the largest refractive index in the plane, and a refractive index in the direction of the fast axis, which is a direction orthogonal to the direction of the slow axis. The polarizing plate integrated conductive optical laminate according to claim 1, wherein a difference (nx−ny) from (ny) is 0.05 or more.   The angle formed between the absorption axis of the polarizing element film and the transparent base material, and the absorption axis of the polarizing element film and the slow axis of the transparent base material is 0 ° ± 30 ° or 90 ° ± 30 °. The polarizing plate-integrated conductive optical laminate according to claim 2 or 3, which is laminated as described above.   The absorption axis of the polarizing element film and the transparent substrate are laminated so that an angle formed by the absorption axis of the polarizing element film and the slow axis of the transparent substrate is 45 ° ± 30 °. The polarizing plate integrated conductive optical laminate according to claim 2 or 3.   The transparent base material is a polyester resin, a polyolefin resin, a (meth) acrylic resin, a polyurethane resin, a polyether sulfone resin, a polycarbonate resin, a polysulfone resin, a polyether resin, or a polyether ketone resin. A polarizing plate-integrated conductive optical laminate according to any one of claims 1 to 5, comprising any one material selected from the group consisting of: a (meth) acrylonitrile-based resin, and a cycloolefin-based resin. .   The polarizing plate integrated conductive optical laminate according to claim 6, wherein the transparent substrate is polyethylene terephthalate.   The polarizing plate-integrated conductive optical laminate according to any one of claims 1 to 7, wherein the conductive layer is a conductive film made of a transparent conductive material.   The polarizing plate-integrated conductive optical laminate according to any one of claims 1 to 8, wherein the conductive layer is formed of a substantially transparent pattern having an opening and an opaque portion, and the opaque portion is formed of metal or conductive ink. body. A polarizing plate integrated conductive optical laminate according to any one of claims 1 to 9,
And a liquid crystal panel unit.   The display device according to claim 10, wherein the polarizing plate-integrated conductive optical laminated body is disposed on a light-emitting surface side surface of the liquid crystal panel unit. The display device according to claim 10 or 11,
A touch panel display device including a touch panel unit at a position opposite to the liquid crystal panel unit.   The display device according to claim 10, wherein the conductive layer is grounded, and the conductive film has an electromagnetic wave shielding function.   The display device according to claim 10, wherein the primary light source is a white LED.

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