JP2013072964A - Flexible substrate laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible substrate laminate capable of easily improving dimensional accuracy of a pattern after laminating a pair of flexible substrates and easily and precisely performing positioning of a pattern with an opposing substrate on which other patterns to be formed in a following step.SOLUTION: A flexible substrate laminate 10 includes a pair of flexible substrates 11 and 12 and an adhesive layer 13 that is interposed between the flexible substrates 11 and 12 for bonding them. On one flexible substrate 11 of the pair of flexible substrates 11 and 12, a pattern 14 is formed. At a part where the pattern 14 is formed on this one flexible substrate 11, a difference between a strain in one direction caused by bonding the pair of flexible substrates and a strain in a direction perpendicular to the direction is within ±0.005%.

Description

  The present invention relates to a flexible substrate laminate.

  In recent years, with the rapid spread of flat displays such as liquid crystal displays, organic EL displays, and electronic paper displays, the demand for display members constituting such displays has increased. Current flat panel displays are widely used not only for TVs and desktop monitors, but also for portable electronic devices such as portable notebook computers, mobile phones, portable game consoles, electronic readers, and electronic books. For this reason, further weight reduction, size reduction, and thickness reduction are required.

  In such a situation, as a display member constituting a liquid crystal display, an organic EL display, an electronic paper display, etc., a flexible substrate made of a flexible film was used instead of the glass substrate which has been mainly used so far. Display members have been proposed. By using a flexible substrate instead of the glass substrate in the display member, the display can be a flexible display. Actually, as such a flexible display, for example, a transparent touch panel, a liquid crystal display, an organic EL display, and the like are known.

  However, since the flexible substrate has lower mechanical strength than the conventional glass substrate, there is a problem that the flexible substrate is distorted when the display member is manufactured using the flexible substrate. In order to solve this problem, for example, it is disclosed that a stress relaxation hole is provided in a flexible substrate as in Patent Document 1.

JP 2009-36859 A

  When manufacturing a display member using a flexible substrate, the flexible substrate is distorted and the pattern formed on the flexible substrate, particularly when one flexible substrate on which a pattern is formed is bonded to another flexible substrate with an adhesive layer. There is a problem that the dimensional accuracy is lowered. In this case, it becomes difficult to align and bond the counter substrate on which another pattern is formed to the pair of flexible substrates distorted by bonding. In addition, when the pair of flexible substrates is distorted with isotropic properties, it can be corrected to some extent by changing the environment such as temperature and humidity. If it is distorted with anisotropy, such correction cannot be applied, and alignment with the counter substrate becomes difficult. For example, in a color filter in which red pixels, green pixels, and blue pixels are arranged in a row at a resolution of 200 dpi, when a pattern having a distance of 200 mm changes by 40 μm (corresponding to a dimensional change of 200 ppm), one color A minute shift will occur, which becomes a serious defect. For this reason, it has been difficult to produce a color filter having a large area using a flexible substrate. Here, the pair of flexible substrates bonded together is “distorted with isotropicity” means that the pair of flexible substrates are bonded in one direction, for example, the X direction or the Y direction in FIG. That occurs. Further, the phrase “a pair of flexible substrates bonded together is distorted with anisotropy” means that a strain is generated in a direction perpendicular to the strain direction in addition to the strain. For example, it means that distortion is also generated in the Y direction, which is a direction perpendicular to the X direction in FIG.

  The present invention solves the above problems, can easily improve the dimensional accuracy of a pattern after bonding a pair of flexible substrates, and a counter substrate on which another pattern to be joined in a later step is formed. An object of the present invention is to provide a flexible substrate laminate that can easily and accurately align a pattern.

  The present invention includes a pair of flexible substrates, and an adhesive layer interposed between the pair of flexible substrates and bonded to the pair of flexible substrates, and a pattern is formed on one flexible substrate of the pair of flexible substrates. In the portion of the one flexible substrate where the pattern is formed, strain in one direction caused by bonding the pair of flexible substrates and a direction perpendicular to the direction A flexible substrate laminate is provided in which the difference from the strain is within ± 0.005%.

  According to the solution of the present invention, in one portion of the flexible substrate where the pattern is formed, the strain in one direction caused by bonding the pair of flexible substrates is perpendicular to the direction. The difference from the directional strain can be reduced. In addition, by reducing the strain with anisotropy caused by laminating a pair of flexible substrates, it is easy and accurate with the counter substrate on which other patterns to be joined in the subsequent process are formed. Well, the pattern can be aligned.

  Note that a plurality of the patterns may be formed on one flexible substrate of the pair of flexible substrates.

  Further, the pattern may have a pixel pattern for a color filter.

  The present invention solves the above problems, and after bonding a pair of flexible substrates, the dimensional accuracy of a pattern formed on one flexible substrate can be easily improved, The pattern can be easily and accurately aligned with the counter substrate on which the above pattern is formed.

FIG. 1 is a cross-sectional view showing a configuration of a flexible substrate laminate in an embodiment for carrying out the present invention. FIG. 2 is a plan view showing the first flexible substrate in the embodiment for carrying out the present invention. FIG. 3: is sectional drawing which shows the outline of the bonding apparatus in the form for implementing this invention. Fig.4 (a) is sectional drawing which shows the state before a pair of flexible substrate is bonded together in the form for implementing this invention. FIG. 4B is a cross-sectional view showing a state in which a pair of flexible substrates are bonded together. FIG. 4C is a cross-sectional view showing a state where the counter substrate is bonded. FIG. 5 is a cross-sectional view showing a state before a pair of flexible substrates are bonded together in a modification of the embodiment for carrying out the present invention. Fig.6 (a) is sectional drawing which shows the structure of the flexible substrate laminated body which has a barrier layer in the modification of the form for implementing this invention. FIG.6 (b) is sectional drawing which shows the structure of the flexible substrate laminated body which has AG (anti-gray) layer. FIG.6 (c) is sectional drawing which shows the structure of the flexible substrate laminated body which has AR layer (anti-reflection). FIG.6 (d) is sectional drawing which shows the structure of the flexible substrate laminated body which has a hard-coat layer. Fig.7 (a) is sectional drawing which shows the structure of the flexible substrate laminated body which has a barrier layer and a hard-coat layer in the modification of the form for implementing this invention. FIG.7 (b) is sectional drawing which shows the structure of the flexible substrate laminated body which has a barrier layer and AG layer. FIG.7 (c) is sectional drawing which shows the structure of the flexible substrate laminated body which has a barrier layer and AR layer.

1. Hereinafter, the flexible substrate laminate of the present invention will be described with reference to FIG. A flexible substrate laminate 10 shown in FIG. 1 is interposed between a pair of strip-shaped flexible substrates, that is, a first flexible substrate 11 and a second flexible substrate 12, and a first flexible substrate 11 and a second flexible substrate 12. And an adhesive layer 13 in which the first flexible substrate 11 and the second flexible substrate 12 are bonded together.

  As shown in FIGS. 1 and 2, a plurality of color filter patterns 14 are formed on the first flexible substrate 11. Each pattern 14 corresponds to a rectangular pixel pattern 15 for a color filter including a red pixel 15a, a green pixel 15b, a blue pixel 15c, and a black matrix (not shown) as necessary, and four corners of the pixel pattern 15. And a cross-shaped mark 16 formed at each position. As shown in FIG. 1, there is an adhesive layer 13 between the first flexible substrate 11 and the second flexible substrate 12, and the surface of the first flexible substrate 11 on which the pattern 14 is formed and the adhesive layer 13 face each other. A pair of flexible substrates is bonded together.

  Next, the distortion which arises by bonding a pair of flexible substrates 11 and 12 in the part in which the one pattern 14 was formed among the 1st flexible substrates 11 is demonstrated. Here, “strain” is a change in shape or volume that generally occurs when an external force is applied to an object. In the present invention, the distortion in one direction generated by bonding the pair of flexible substrates 11 and 12, for example, the strain in the X direction in FIG. 2, and the direction perpendicular to the direction, for example, the Y direction in FIG. The difference from the strain is within ± 0.005%, preferably within ± 0.0025%. In this case, before and after the pair of flexible substrates 11 and 12 are bonded, the difference between the change in dimension in one direction of the pattern 14 and the change in dimension in the vertical direction is ± 0.005%. And preferably within ± 0.025%. That is, after bonding a pair of flexible substrates, the dimensional accuracy of the pattern formed on one flexible substrate can be easily improved. In addition, after bonding a pair of flexible substrates, by improving the dimensional accuracy of the pattern formed on one flexible substrate, even if it is distorted with anisotropy, for example, the environment of temperature, humidity, etc. The dimension of the flexible substrate can be corrected by the change, and the pattern can be aligned with the counter substrate easily and accurately. Specifically, when the flexible substrate laminate 10 having the pixel pattern 15 for the color filter and the TFT array are bonded together, driving the liquid crystal element may be inconvenient if the dimensional deviation is within ± 10 μm. Can be prevented, the transmittance and color of the pixels can be maintained within a predetermined range, and the image display can be improved.

  Further, a method of confirming the distortion generated by bonding the first flexible substrate 11 and the second flexible substrate 12 in the first flexible substrate 11 will be described. Such a strain is obtained by measuring the dimension of the pattern 14 of the first flexible substrate 11 before and after the first flexible substrate 11 and the second flexible substrate 12 are bonded together. When the dimension between the marks 16 is used as the dimension of the pattern 14, for example, as shown in FIG. 2, the dimension A between the X direction marks 16 and the mark 16 in the Y direction of the first flexible substrate 11. What is necessary is just to measure the B dimension between. Note that it is generally preferable to use a length measuring device for measuring the dimensions. In particular, a precise length measuring machine capable of measuring dimensions to the micrometer unit is more preferable. For example, an ultra-precision automatic two-dimensional coordinate measuring machine manufactured by SOKKIA or a CNC image measuring system manufactured by Nikon Instruments Company can be used.

  Using the A and B dimensions between the marks 16 of each pattern 14 before bonding and the A and B dimensions after bonding, the difference between the dimensions, that is, the strain, is obtained, and the first flexible substrate 11 is obtained. Among them, the distortion caused by the bonding of the portions where the respective patterns 14 are formed can be confirmed.

  Further, the dimensions of the pattern 14 are not limited to measuring the A dimension and the B dimension between the marks 16, and the dimension of the pixel pattern 15 may be measured. In this case, the dimension in the X direction and the dimension in the Y direction of the rectangular pixel pattern 15 may be measured. Alternatively, the size of an aggregate of a predetermined number of red pixels 15a, green pixels 15b, and blue pixels 15c continuous in the X direction and a predetermined number of red pixels 15a, green pixels 15b, and blue pixels 15c continuous in the Y direction. You may measure the dimension of an aggregate.

(1) Flexible substrate Next, the material of each flexible substrate 11 and 12 is demonstrated. Here, “flexible” means that there is flexibility, and “flexible substrate” means a substrate that is generally flexible and can be bent. The flexible substrates 11 and 12 in the present embodiment are not particularly limited as long as the plasticity is not extremely high even when tension is applied, and may be appropriately selected and used depending on the display application. it can. Examples of such flexible substrates include polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyethersulfone (PES), polyimide (PI), polyetheretherketone (PEEK), polycarbonate (PC), and polyethylene. (PE), polypropylene (PP), polyphenylene sulfide (PPS), polyetherimide (PEI), cellulose triacetate (CTA), cyclic polyolefin (COP), polymethyl methacrylate (PMMA), polysulfone (PSF), polyamideimide (PAI) ), Synthetic resins such as nobornene resins and allyl ester resins. Of these, PEN and PET are preferably used.

  The thickness of the flexible substrates 11 and 12 is preferably in the range of 10 μm to 500 μm, and preferably in the range of 20 μm to 300 μm. This is because if the thickness of the flexible substrates 11 and 12 is too thick than the above range, the flexibility is impaired, the flexible substrates 11 and 12 are easily broken, and it is difficult to wind them in a roll shape. On the other hand, if it is thinner than the above range, there will be no strain and handling in the process will be difficult.

  Although it does not specifically limit as the width | variety of the flexible substrates 11 and 12, For example, it is preferable to exist in the range of 50 mm-2000 mm, Preferably it exists in the range of 100 mm-1500 mm.

  In addition, the flexible substrates 11 and 12 may have a configuration composed of a single layer, or may have a configuration in which a plurality of layers are stacked.

(2) Adhesive layer Next, the material of the adhesive layer 13 is demonstrated. The material of the adhesive layer 13 is not particularly limited as long as it is a flexible material, and is preferably made of an acrylic or styrene resin material. Moreover, as thickness of the adhesion layer 13, what is necessary is just a thickness which is a grade by which a softness | flexibility is not lost.

2. Bonding apparatus Next, the bonding apparatus 20 which bonds the 1st flexible substrate 11 and the 2nd flexible substrate 12 is demonstrated using FIG. The bonding apparatus 20 shown in FIG. 3 includes a first feeding roll 21 that feeds out the first flexible substrate 11 on which the pattern 14 is formed, and a second feeding roll 22 that feeds out the second flexible substrate 12 on which the adhesive layer 13 is provided. have.

  Laminate for laminating the first flexible substrate 11 fed from the first feeding roll 21 and the second flexible substrate 12 fed from the second feeding roll 22 on the downstream side of the first feeding roll 21 and the second feeding roll 22. A portion 23 is provided. In this laminate part 23, the first flexible substrate 11 and the second flexible substrate 12 are bonded together via the adhesive layer 13, and the flexible substrate laminate 10 is produced. The laminating section 23 includes a pair of pressing rollers 23a and 23b, and a gap L between the pair of pressing rollers 23a and 23b (hereinafter also referred to as “laminate gap”), that is, a gap L between the pressing rollers 23a and 23b. By adjusting this, the laminating pressure when laminating the first flexible substrate 11 and the second flexible substrate 12 can be adjusted. Further, the material of the pair of pressing rollers 23a and 23b may be both metal or both may be rubber, or one may be metal and the other may be rubber. Preferably, the pressing roller 23a on the first flexible substrate 11 side is made of metal, 2 The pressing roller 23b on the flexible substrate 12 side is preferably made of rubber.

  A take-up roll 24 that winds the flexible substrate laminate 10 into a roll is provided on the downstream side of the laminating unit 23. The take-up roll 24 has a function as a drive unit that conveys the flexible substrate laminate 10.

  Moreover, in the bonding apparatus 20 shown in FIG. 3, the torque of the direction opposite to a conveyance direction is loaded to the 1st delivery roll 21 and the 2nd delivery roll 22, and it is conveyed by adjusting this torque. The tension applied to the first flexible substrate 11 and the second flexible substrate 12 can be adjusted.

3. Next, a method for bonding the pair of flexible substrates 11 and 12, that is, a method for manufacturing the flexible substrate laminate 10 will be described.

  First, as shown in FIG. 2, a plurality of patterns 14 having pixel patterns 15 and marks 16 are formed on the first flexible substrate 11. Examples of the method for forming the pattern 14 include a photolithography method and an ink jet method.

  Then, the 1st flexible substrate 11 is wound in roll shape so that the pattern 14 may be arrange | positioned facing a radial direction outer side, and is attached to the 1st feeding roll 21 shown in FIG.

  On the other hand, the second flexible substrate 12 is provided with an adhesive layer 13, and the second flexible substrate 12 is wound in a roll shape so that the adhesive layer 13 is disposed facing outward in the radial direction. Attached to the feeding roll 22.

  Next, the take-up roll 24 is driven, and the first flexible substrate 11 and the second flexible substrate 12 are bonded together as shown in FIG. 4 (a), and the flexible substrate lamination is performed as shown in FIG. 4 (b). A body 10 is produced.

  In this case, first, the first flexible substrate 11 is fed out from the first feeding roll 21 and the second flexible substrate 12 is fed out from the second feeding roll 22. Subsequently, the first flexible substrate 11 and the second flexible substrate 12 that have been fed out are bonded to each other via the adhesive layer 13 in the laminate portion 23. In the laminating part 23, as shown in FIG. 4A, the pattern 14 formed on the first flexible substrate 11 and the adhesive layer 13 provided on the second flexible substrate 12 face each other. The flexible substrate 11 and the second flexible substrate 12 are bonded together.

While the first flexible substrate 11 and the second flexible substrate 12 are being transported, the tension per unit sectional area loaded on the first flexible substrate 11 and the tension per unit sectional area loaded on the second flexible substrate 12 Are preferably small and comparable. In general, the tension per unit cross-sectional area is preferably 0.026 N / mm ² or more and 4000 N / mm ² or less. When the tension per unit area is less than 0.026 N / mm ² , the tension per unit area is too small, and there is a possibility that problems such as meandering may occur in the roll-to-roll conveyance. On the other hand, when the tension per unit area is larger than 4000 N / mm ² , the tension per unit area is too large, and the flexible substrate may be plastically deformed. Here, the tension per unit cross-sectional area applied to the first flexible substrate 11 is the same as the tension applied to the first flexible substrate 11 being transported, the cross-sectional area of the first flexible substrate 11 (width × thickness). It is calculated by dividing by. On the other hand, the tension per unit cross-sectional area loaded on the second flexible substrate 12 is the cross-sectional area of the second flexible substrate 12 (width × thickness). It is calculated by dividing. Furthermore, “deformation” here is a change in the shape of the flexible substrate before the pair of flexible substrates are bonded together.

  The strain due to the tension per unit cross-sectional area applied to the pair of flexible substrates 11 and 12 is obtained by dividing the tension per unit cross-sectional area by the Young's modulus. When the pair of flexible substrates 11 and 12 have the same Young's modulus, the difference in strain due to the tension per unit cross-sectional area loaded on the pair of flexible substrates 11 and 12 is preferably within ± 0.01%. . As a result, the deformation amount of the first flexible substrate 11 and the deformation amount of the second flexible substrate 12 can be made comparable. When the materials are different between the first flexible substrate 11 and the second flexible substrate 12, the strain due to the tension per unit cross-sectional area is calculated from the tension per unit cross-sectional area described above using the Young's modulus of each material. The strain due to the tension per unit cross-sectional area of the first flexible substrate 11 and the strain due to the tension per unit cross-sectional area of the second flexible substrate 12 are approximately the same, for example, the difference in strain due to the tension per unit cross-sectional area is The tension may be set so as to be within ± 0.01%.

  Moreover, it is preferable to make the lamination pressure low when bonding the 1st flexible substrate 11 and the 2nd flexible substrate 12 together. For example, when the total thickness of the first flexible substrate, the pattern 14, the second flexible substrate, and the adhesive layer before being bonded is d, the gap (laminate gap) between the pair of pressing rollers 23a and 23b shown in FIG. L is preferably (d−40) μm or more and (d + 40) μm or less. When the laminate gap L is smaller than (d-40) μm, the tension per unit area applied to the first flexible substrate 11 and the second flexible substrate 12 when the first flexible substrate 11 and the second flexible substrate 12 are bonded to each other. The difference in strain increases. On the other hand, when the laminate gap L is larger than (d + 40) μm, the laminate pressure required for bonding is insufficient, and problems such as air biting occur. Here, it is assumed that the laminate gap L is adjusted using a clearance gauge. Thus, the first flexible substrate 11 and the second flexible substrate 12 can be securely bonded together, and distortion due to bonding can be suppressed.

  In general, the tension acting in the transport direction of the flexible substrates 11 and 12 causes distortion in the transport direction of the flexible substrates 11 and 12 and changes the dimension of the pattern 14 in the transport direction. Distortion occurs not only in the direction but also in the direction perpendicular to the transport direction, and the dimension in the direction perpendicular to the transport direction also changes.

  In order to eliminate the strain anisotropy of the flexible substrate 11 as described above, the anisotropy can be eliminated by adjusting the lamination pressure or the tension per unit cross-sectional area applied to the flexible substrates 11 and 12. Specifically, if it is within the range where no large strain occurs, the tension contributes to the strain in the transport direction and the pressure contributes to the strain in the direction perpendicular to the transport direction. Even in such a case, the distortion in the direction perpendicular to the conveying direction can be generated by narrowing the laminating gap L and increasing the laminating pressure. As a result, the difference between the strain in the transport direction caused by bonding the pair of flexible substrates 11 and 12 and the strain in the transport direction and the vertical direction can be within ± 0.005%.

  As described above, the flexible substrate laminate 10 in which the first flexible substrate 11 and the second flexible substrate 12 are bonded together by the adhesive layer 13 as shown in FIG. 1 is obtained. In the flexible substrate laminate 10, in the portion where each pattern 14 is formed in the first flexible substrate 11, the strain in one direction caused by the bonding of the pair of flexible substrates 11 and 12, and the direction Thus, the difference from the strain in the vertical direction can be within ± 0.005%. Therefore, by adjusting the tension per unit cross-sectional area loaded on each of the first flexible substrate 11 and the second flexible substrate 12 and the laminating pressure when the first flexible substrate 11 and the second flexible substrate 12 are bonded together. The dimensional accuracy of the pattern 14 can be easily improved.

  Thereafter, the flexible substrate laminate 10 is wound around the winding roll 24 and formed into a roll shape.

  The method for confirming the strain generated by bonding the first flexible substrate 11 and the second flexible substrate 12 is as described above, but here, the flexible substrate laminate 10 shown in FIG. 1 was produced. Later, that is, after the first flexible substrate 11 and the second flexible substrate 12 are bonded together, a method for obtaining the dimension before bonding of the pattern 14 on the first flexible substrate 11 will also be described.

  First, the flexible substrate laminate 10 is sufficiently immersed in an organic solvent such as acetone. Subsequently, the second flexible substrate 12 and the adhesive layer 13 are peeled from the first flexible substrate 11 so that a large stress is not applied to the first flexible substrate 11. By peeling in this way, the influence on the pattern 14 due to the stress of the second flexible substrate 12 is removed, and the first flexible substrate 11 is prevented from being deformed while the first flexible substrate 11 is deformed. Can be peeled off.

  As another method for removing the influence of the stress caused by the second flexible substrate 12, only the second flexible substrate 12 is latticed at intervals of 10 mm, for example, without peeling the second flexible substrate 12 from the first flexible substrate 11. It may be half-cut into a shape.

  Next, before peeling off the first flexible substrate 11 and the second flexible substrate 12, the peeled first flexible substrate 11 is exposed to an atmosphere having the same temperature and humidity as when the dimension between the marks 16 is measured, and the first flexible substrate is exposed. 11 until the solvent evaporates and equilibrates. By leaving in such an atmosphere, the temperature and water absorption rate of the peeled first flexible substrate 11 can be made equal to the temperature and water absorption rate of the first flexible substrate 11 before peeling, and the dimensions due to changes in the surrounding environment. The factor of change can be removed.

  Thereafter, the A dimension and the B dimension between the marks 16 of each pattern 14 on the first flexible substrate 11 are measured. The A and B dimensions between the obtained marks 16 correspond to the A and B dimensions before the second flexible substrate 12 is bonded. Thus, even after the first flexible substrate 11 and the second flexible substrate 12 are bonded together, the A dimension and the B dimension before bonding can be obtained. By obtaining the A dimension and B dimension between the marks 16 of the pattern 14 before bonding obtained in this way and the A dimension and B dimension after bonding, the difference in each dimension before and after bonding is obtained, The distortion | strain of the part in which the pattern 14 was formed among the 1st flexible substrates 11 can be confirmed.

  According to the present embodiment, in one portion of the first flexible substrate 11 where the one pattern 14 is formed, the strain in one direction caused by bonding the pair of flexible substrates 11 and 12, The difference in strain in the direction perpendicular to the direction is within ± 0.005%. By such bonding, distortion due to the bonding of the pair of flexible substrates 11 and 12 in the portion of the first flexible substrate 11 where the pattern 14 is formed can be reduced. The difference with the dimension of the pattern 14 after bonding can be reduced. For this reason, it can suppress that the dimension of the pattern 14 changes before and after bonding, and can improve the dimensional accuracy of the pattern 14 formed in the 1st flexible substrate 11 easily. Further, the pattern 14 can be easily and accurately aligned with another pattern to be bonded in a later process, for example, the counter substrate 30 with a mark on which a TFT, an image display element, and the like are formed.

  In the present embodiment, an example in which the adhesive layer 13 is provided on the second flexible substrate 12 before bonding has been described. However, the present invention is not limited to this, and as shown in FIG. 5, the adhesive layer 13 is not provided on the second flexible substrate 12 before bonding, but is provided on the pattern 14 formed on the first flexible substrate 11. Anyway. The method for bonding the first flexible substrate and the second flexible substrate in this case is the same as the method described above, and will not be described.

  Moreover, in this Embodiment, the example in which only the adhesion layer 13 was provided in the 2nd flexible substrate 12 was demonstrated. However, the present invention is not limited to this, and various functional layers, that is, a barrier that suppresses permeation of oxygen as shown in FIG. 6A on the surface opposite to the adhesive layer 13 of the second flexible substrate 12. Layer 40, an AG (anti-gray) layer 41 or an AR (anti-reflection) layer 42 as an antireflection layer for suppressing screen flickering as shown in FIGS. 6B and 6C, as shown in FIG. A hard coat layer 43 that prevents the display from being damaged may be provided.

  Moreover, the flexible substrate laminated body 10 may have two functional layers as shown in FIG. As such a flexible substrate laminate 10, for example, as shown in FIG. 7A, a barrier layer 40, a second adhesive layer 45, a third flexible substrate 46, and a hard coat layer are provided on the second flexible substrate 12. 43 may be sequentially laminated. In this case, the order of bonding of the first flexible substrate 11 and the second flexible substrate 12 and the bonding of the second flexible substrate 12 and the third flexible substrate 46 is not limited, and the barrier layer 40 and the hard coat are not limited. The layer 43 can be formed on each of the second flexible substrate 12 and the third flexible substrate 46 at an arbitrary timing. In this way, the flexible substrate laminate 10 shown in FIG. 7A can be produced. Thereby, even if it is the flexible substrate laminated body 10 which has the barrier layer 40 and the hard-coat layer 43, the dimensional accuracy of the pattern 14 can be improved easily.

  Further, for example, as shown in FIGS. 7B and 7C, the second flexible substrate 12 is provided with a barrier layer 40, a second adhesive layer 45, a third flexible substrate 46, an antireflection layer (AG layer 41 or The AR layer 42) may be sequentially stacked. In this case, the order of the bonding of the first flexible substrate 11 and the second flexible substrate 12 and the bonding of the second flexible substrate 12 and the third flexible substrate 46 is not limited, and the barrier layer 40 and the antireflection layer are not limited. The layers 41 and 42 can be formed on the second flexible substrate 12 and the third flexible substrate 46, respectively, at an arbitrary timing. In this way, the flexible substrate laminate 10 shown in FIGS. 7B and 7C can be manufactured. Thereby, even if it is the flexible substrate laminated body 10 which has the barrier layer 40 and the antireflection layers 41 and 42, the dimensional accuracy of the pattern 14 can be improved easily.

  In addition, although the example in which the various functional layers are laminated on the surface opposite to the adhesive layer 13 of the second flexible substrate has been described, the present invention is not limited to this, and the various functional layers are formed on the first flexible substrate 11. It may be laminated on the surface opposite to the pattern 14. Moreover, in the example in which the various functional layers described above are provided, the example in which the pattern 14 and the adhesive layer 13 are configured to face each other has been described. However, the present invention is not limited thereto, and the first flexible substrate 11 is not limited thereto. Even when the pattern 14 is formed on the surface opposite to the surface on the adhesive layer 13 side, various functional layers as described above can be provided in the same manner.

  As mentioned above, although embodiment by this invention has been described, naturally, within the scope of the gist of this invention, these embodiment can also be combined suitably partially. Further, in the present embodiment, various modifications other than the above-described modifications are possible within the scope of the present invention.

Example 1
In the flexible substrate laminate 10 of the present invention, the dimension of the pattern 14 before and after bonding was measured.

  First, a 300 mm width × 0.125 mm thickness, 10 m length PET film (manufactured by Toyobo Co., Ltd., Cosmo Shine A4100) is prepared as the first flexible substrate 11, and the second adhesive layer 13 is provided. As the flexible substrate 12, an adhesive film with a base material of 270 mm wide × 0.075 mm thick and 10 m long (manufactured by Nitto Denko Corporation, CS9621T) was prepared. The base material (second flexible substrate 12) is made of PET.

  A plurality of pixel patterns 15 were formed on the PET film, and dimension measurement marks 16 were formed at positions corresponding to the four corners of each pixel pattern 15 (see FIG. 2). In addition, the thickness of the pixel pattern 15 and the mark 16 was 2 μm, and the distance between the marks 16 was 212 mm. Here, before bonding a PET film and an adhesive film, the dimension between the marks 16 formed on the PET film was measured by the method described above.

  As the bonding apparatus 20, a bonding apparatus manufactured by DNK Co., Ltd. (DNK) was used.

When laminating the PET film and adhesive film, the conveyance speed is 1 m / min, the laminate gap L is adjusted to 190 μm, the tension applied to the PET film is 50 N, and the tension applied to the adhesive film is 28 N. , the tension per unit cross-sectional area PET film 1.33N / mm ^2, the adhesive film is 1.38N / mm ^2.

  Next, a PET film and an adhesive film were bonded together to produce a flexible substrate laminate 10, and the dimensions between the marks 16 measured before bonding were measured.

The difference in the MD dimension between the obtained marks 16 before and after bonding is -0.001% (for example, the deviation from the reference dimension of 100 mm is -1 μm), and the difference in the TD dimension is + 0.001% (for example, It was confirmed that the deviation from the 100 mm reference dimension was +1 μm), and the difference between the change in the MD dimension and the change in the TD dimension was ± 0.005% or less. That is, in the portion of the PET film where the pattern 14 is formed, the MD strain is -0.001%, the TD strain is + 0.001%, and the strain difference between MD and TD is ± 0.005% or less. I confirmed that there was. Further, the PET film has a plurality of portions where the pattern 14 is formed. On the PET film, it was confirmed that the difference in strain between MD and TD in the portion where each pattern 14 was formed was ± 0.005% or less. Here, “MD (abbreviation of“ Machine Direction ”)” is a film conveyance direction, and “TD (abbreviation of“ Transverse Direction ”)” is a direction perpendicular to the film conveyance direction.
Comparative Example 1

The method was the same as in Example 1 except that the tension applied to the adhesive film was 18N. In this case, the tension per unit cross-sectional area is 0.89 N / mm ² .

The difference in the MD dimension between the obtained marks 16 before and after bonding is + 0.009% (for example, the deviation from the reference dimension of 100 mm is +9 μm), and the difference in the TD dimension is + 0.001% (for example, 100 mm). The deviation from the reference dimension was +1 μm), and it was confirmed that the difference between the change in the MD dimension and the change in the TD dimension was 0.008%. That is, in the portion of the PET film where the pattern 14 is formed, the MD strain is + 0.009%, the TD strain is + 0.001%, and the difference between the MD strain and the TD strain is 0.008%. I confirmed that there was. In addition, MD is a film conveyance direction here, and TD shows a perpendicular | vertical direction with respect to the film conveyance direction.
Comparative Example 2

  Example 2 was repeated except that the laminate gap L was 150 μm.

  The difference in the MD dimension between the obtained marks 16 before and after bonding is + 0.001% (for example, the deviation from the reference dimension of 100 mm is +1 μm), and the difference in the TD dimension is + 0.025% (for example, 100 mm) The deviation from the reference dimension was +25 μm), and it was confirmed that the difference between the change in the MD dimension and the change in the TD dimension was 0.024%. That is, in the portion of the PET film where the pattern 14 is formed, the MD strain is + 0.001%, the TD strain is + 0.025%, and the difference between the MD strain and the TD strain is 0.024%. I confirmed that there was. In addition, MD is a film conveyance direction here, and TD shows a perpendicular | vertical direction with respect to the film conveyance direction.

  Furthermore, when each pattern 14 of the flexible substrate laminate 10 obtained in Example 1, Comparative Example 1, and Comparative Example 2 was superimposed on the counter substrate 30 with a mark, in Example 1, temperature and humidity were adjusted. Thus, the marks could be easily and accurately aligned, but in the flexible substrate laminate 10 obtained in Comparative Example 1 and Comparative Example 2, the strain having anisotropy was subjected to temperature and humidity. It was not possible to correct in such an environment, and the alignment could not be performed accurately.

DESCRIPTION OF SYMBOLS 10 Flexible substrate laminated body 11 1st flexible substrate 12 2nd flexible substrate 13 Adhesive layer 14 Pattern 15 Pixel pattern 15a Red pixel 15b Green pixel 15c Blue pixel 16 Mark 20 Pasting apparatus 21 1st delivery roll 22 2nd delivery roll 23 Laminating Part 23a, 23b Pressing roller 24 Winding roll 30 Counter substrate 40 Barrier layer 41 AG layer 42 AR layer 43 Hard coat layer 45 Second adhesive layer 46 Third flexible substrate

Claims (3)

  A pair of flexible substrates and an adhesive layer interposed between the pair of flexible substrates and bonded to the pair of flexible substrates, wherein a pattern is formed on one of the pair of flexible substrates. In one portion of the flexible substrate, the strain in one direction caused by bonding the pair of flexible substrates and the strain in the direction perpendicular to the direction in the portion where the pattern is formed The flexible substrate laminate is characterized in that the difference from the above is within ± 0.005%.   2. The flexible substrate laminate according to claim 1, wherein a plurality of the patterns are formed on one flexible substrate of the pair of flexible substrates. 3.   The flexible substrate laminate according to claim 1, wherein the pattern has a pixel pattern for a color filter.

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