JPWO2011121641A1 - Laminated panel and manufacturing method thereof - Google Patents

Abstract

The flexible film is bonded together by the seal wall 24 provided on the outer peripheral portion of the flexible film (14, 15) (16, 17) (18, 19), and the liquid crystal is placed inside the seal wall 24. A plurality of display panels 11, 12, and 13 having a liquid crystal layer sealed with 20, 21, and 22 are the same as or larger than the display area 32 of each display panel 11, 12, and 13, and are surrounded by a seal wall 24. It laminated | stacked through the adhesive sheet 26 which adhere | attaches only the area | region smaller than the produced | generated area | region.

Description

  The present invention relates to a laminated panel in which a plurality of display panels are laminated and bonded together with an adhesive layer, and a method for manufacturing the same.

  In recent years, electronic paper using the memory property of cholesteric liquid crystal has begun to be adopted. Electronic paper using a cholesteric liquid crystal can maintain an arbitrary display by changing the magnitude of voltage or the voltage application time.

  Further, in electronic paper using cholesteric liquid crystal, color display is possible by stacking three display panels for displaying R (red), G (green), and B (blue). In addition, when laminating | stacking a display panel, an optical adhesive agent or an optical adhesive sheet is used, for example.

By the way, under a low temperature environment, the cholesteric liquid crystal in the display panel undergoes thermal contraction (volume decreases). This point is common to liquid crystals other than cholesteric liquid crystals.
FIG. 1A is a cross-sectional view of a conventional example of a single display panel 110 in which a cholesteric liquid crystal 120 is sandwiched between two films 140 and 150. In this case, as shown in FIG. 1B, the display panel 110 can follow the films 140 and 150 with the thermal contraction of the cholesteric liquid crystal 120 (in the direction of the arrow in FIG. 1B), so-called foaming phenomenon (low-temperature foaming (bubbles inside the liquid crystal). Is not generated))).

  Here, FIG. 2A is a cross-sectional view of a conventional example in a state where three display panels 110, 120, and 130 are bonded with an adhesive 420. In this case, when the three display panels 110, 120, and 130 are bonded with the adhesive 420, the display panel 120 sandwiched between the upper and lower parts is pressed down by the other display panels 110 and 130 and follows the heat shrinkage. It will not be possible.

  Thus, as shown in FIG. 2B, when the ambient temperature changes, for example, in a low temperature environment, the intermediate display panel 120 cannot follow the thermal contraction of the cholesteric liquid crystals 200, 210, and 220. Therefore, in the intermediate display panel 120, a portion where the cholesteric liquid crystal 210 contracts becomes a gap, and a foaming phenomenon (low-temperature foaming) occurs (see the broken line in FIG. 2B).

3A is a cross-sectional view of a conventional example of a laminated panel 100 in which three display panels 110, 120, and 130 are sandwiched between protective plates 440 and 450. FIG.
As described above, when the laminated panel 100 is put in the housing, the same low-temperature foaming phenomenon as described above occurs even when the adhesive between the laminated panel 100 and the protective plates 440 and 450 is fixed. Further, in this case, since the protective plates 440 and 450 sandwich the laminated panel 100 are provided, not only the intermediate display panel 120 but also the upper and lower display panels 110 and 130 as shown in FIG. 3B. In addition, the low temperature foaming phenomenon tends to occur.

  On the other hand, in Patent Document 1, a double bank (columnar partition) is formed on the surface of the first display panel, and an adhesive is dropped inside the bank to bond the two display panels together. Technology is disclosed.

  Further, in Patent Document 2, an adhesive is dropped on one display panel provided with a frame-shaped partition wall, and the display area is pressed and bonded first, and then the partition wall portion is pressed and two displays are displayed. A technique for laminating panels is disclosed.

However, in the case of Patent Document 1 and Patent Document 2, both of the display panels are bonded to each other, and no problem to be solved such as suppression of low-temperature foaming is shown.
For this reason, when the whole laminated panel in which a plurality of display panels are laminated is bonded, at least the intermediate display panel cannot follow the contraction of the liquid crystal layer and low temperature foaming occurs. Thus, image distortion or the like occurs, which affects display quality.

JP 2008-203714 A JP 2009-103976 A

The present invention provides a laminated panel in which stress generated when a liquid crystal layer expands and contracts due to changes in environmental conditions such as temperature and humidity, and a method for manufacturing the same.
The laminated panel of the present invention has a liquid crystal layer in which a flexible film is bonded together by a seal wall provided on the outer peripheral portion of the flexible film, and liquid crystal is sealed inside the seal wall. Multiple display panels
It is characterized by being laminated via an adhesive layer that adheres only to an area that is the same as or larger than the display area of each of the display panels and smaller than the area surrounded by the seal wall.

  According to the present embodiment, only the display area of each display panel is adhered, so that the panel portion other than the display area can freely move. Thereby, under a low temperature environment, the panel portion other than the display area follows the thermal contraction of the liquid crystal, and low temperature foaming is suppressed.

Further, the laminated panel of the present invention is a liquid crystal layer in which a flexible film is bonded by a sealing wall provided on the outer peripheral portion of the flexible film, and liquid crystal is sealed inside the sealing wall. A plurality of display panels having
Adhering and laminating with a sealing material that surrounds only an area that is the same as or larger than the display area of each of the display panels and smaller than the area surrounded by the seal wall, and the inside of the seal material is filled with liquid It is characterized by that.

  According to this embodiment, the display area of each display panel is surrounded by the sealing material and filled with the liquid, so that it is possible to move freely except for the portion adhered by the sealing material. Thereby, in a low temperature environment, panel parts other than a sealing material follow the thermal contraction of a liquid crystal, and low temperature foaming is suppressed.

Further, in the method for manufacturing a laminated panel of the present invention, the flexible film is bonded together by the seal wall provided on the outer peripheral portion of the flexible film, and the liquid crystal is sealed inside the seal wall. Preparing a plurality of display panels having a liquid crystal layer;
Laminating via an adhesive layer that adheres only to a region that is the same or larger than the display region of each of the display panels and that is smaller than a region surrounded by the seal wall;
And a step of curing the adhesive layer.

  According to the present embodiment, when bonding a plurality of display panels, only the respective display areas are bonded. For example, an adhesive sheet having a size corresponding to the display area may be prepared and pasted. Workability is improved.

Further, in the method for manufacturing a laminated panel of the present invention, the flexible film is bonded together by the seal wall provided on the outer peripheral portion of the flexible film, and the liquid crystal is sealed inside the seal wall. Preparing a plurality of display panels having a liquid crystal layer;
Adhering and laminating with a sealing material that surrounds only a region that is the same or larger than the display region of each of the display panels and that is smaller than a region surrounded by the seal wall; and
Curing the sealing material;
Filling the inside of the sealing material with a liquid.

  According to the present embodiment, only the display area is surrounded and adhered by the sealing material, and the liquid is filled inside the sealing material. If the sealing material is accurately positioned and applied, the rest is set in advance. Since the amount of the liquid can be uniformly filled, the operation is simple.

It is sectional drawing of the prior art example of the single-piece | unit display panel in which the cholesteric liquid crystal was provided between two films. It is sectional drawing of the prior art example which shows the state which two films track according to the heat contraction of a cholesteric liquid crystal. It is sectional drawing of the prior art example of the state which adhered the display panel of 3 sheets with the adhesive agent. It is sectional drawing of the prior art example of the state which low temperature foaming generate | occur | produced in the intermediate | middle display panel. It is sectional drawing of the prior art example of the state which clamped three display panels with the protective plate. It is sectional drawing of the prior art example of the state in which low temperature foaming generate | occur | produced in three display panels. It is sectional drawing of the single display panel of 1st Embodiment. It is an external view of the state which has arrange | positioned the transparent electrode in the upper film same as the above. It is an external view of the state which has arrange | positioned the transparent electrode in the lower film same as the above. It is an external view of the display panel formed by bonding the upper and lower films same as the above. It is sectional drawing of the laminated panel formed by laminating | stacking three display panels same as the above. It is sectional drawing which shows the stress state added to the laminated panel in a low temperature environment same as the above. It is sectional drawing of the laminated panel in the low temperature environment same as the above. It is a top view of a laminated panel same as the above. It is a top view of an adhesive sheet same as the above. It is a top view of the state which affixed the adhesive sheet on the display panel same as the above. It is a figure which shows the flowchart of the manufacturing method of a laminated panel same as the above. It is sectional drawing of the state which affixed the adhesive sheet only on the display area of the display panel same as the above. It is a figure which shows the positioning process at the time of sticking of an adhesive sheet same as the above. It is sectional drawing of the state which piled up and pressed the display panel on the display panel same as the above. It is sectional drawing of the state which affixed the adhesive sheet only on the display area of the upper display panel in the state which two display panels same as the above were laminated | stacked. It is sectional drawing of the state which piled up and pressed the 3rd display panel on the upper display panel in the state in which two display panels same as the above were laminated | stacked. It is modification 1 and is an external view of a state in which a bank is formed by intermittently applying a sealing material around an adhesive sheet. It is sectional drawing same as the above. It is sectional drawing at the time of apply | coating and forming a sealing material in the shape of a broken line like a bank close to an adhesive sheet. FIG. 11 is a plan view of a second modified example in which an adhesive is printed on the display panel. It is sectional drawing same as the above. It is sectional drawing at the time of apply | coating and forming a sealing material in the shape of a broken line like the bank close to the printed adhesive agent. FIG. 10 is a plan view of a third modification in which a bank is formed with a sealing material around a display region and an adhesive is filled therein. It is sectional drawing of the laminated panel of 2nd Embodiment. It is sectional drawing which shows the stress state added to the laminated panel in a low temperature environment same as the above. It is sectional drawing of the laminated panel in the low temperature environment same as the above. It is sectional drawing of the laminated panel of 3rd Embodiment. It is sectional drawing of the process of apply | coating a sealing material to the outer side of the display area of a display panel same as the above, and filling the inside. It is sectional drawing of the process of apply | coating a sealing material to the outer side of the display area of a display panel same as the above, and filling the inside. It is a top view same as the above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
4 is a cross-sectional view of a single display panel of the present embodiment, FIG. 5A is an external view of a state in which a transparent electrode is disposed on an upper film (flexibility), and FIG. 5B is a lower film (possible FIG. 6 is an external view of a display panel formed by laminating upper and lower films (flexibility), and FIG. 7 is a laminate of three display panels. It is sectional drawing of the laminated panel made in this way.

  As shown in FIG. 4, the display panel 11 has the films 14 and 15 bonded together by a seal wall 24 provided on the outer periphery of the flexible films 14 and 15 such as two sheets of polycarbonate. The liquid crystal layer in which the liquid crystal 20 and spacers (not shown) are sealed is provided inside the seal wall 24.

  In the present embodiment, the liquid crystal 20 is a cholesteric liquid crystal having a memory property. The type of the liquid crystal 20 is not limited to the cholesteric liquid crystal, and may be a nematic liquid crystal or a smectic liquid crystal, for example.

Further, the display panel 11 shows a lowermost display panel (red (R)) 11 of a three-layer laminated panel 10 shown in FIG.
The image on the display panel 11 is displayed in a rectangular display area 32. In the display area 32, the liquid crystal 20 in the display panel 11 can be controlled (operated) by electrical control (voltage ON / OFF). However, in the present embodiment, the shape of the display area 32 is rectangular, but the present invention is not limited to this.

  As shown in FIG. 5A, a plurality of transparent electrodes (pixel electrodes) 34 are arranged in parallel at a predetermined interval on the upper film 15 (illustrated with the electrode surface facing up). Further, as shown in FIG. 5B, a plurality of transparent electrodes (common electrodes) 35 are arranged on the lower film 14 at a predetermined interval. The transparent electrode 34 of the upper film 15 and the transparent electrode 35 of the lower film 14 are disposed orthogonally.

  Next, as shown in FIG. 6, the upper film 15 is turned upside down (with the electrode face down) on the lower film 14 (in the figure, the electrode face is up). A liquid crystal (not shown in FIG. 6) is sealed between the lower film 14 and the upper film 15.

Thus, when the transparent electrodes 34 and 35 are made into a panel, a region where the transparent electrodes 34 and 35 of the lower film 14 and the upper film 15 overlap is the display region 32.
In FIG. 7, the laminated panel 10 has three display panels 11, 12, and 13 that are laminated one above the other.

  As shown in FIG. 7, this laminated panel 10 is composed of two films (14, 15) (16, 17) for displaying red (R), green (G), and blue (B) colors, respectively. (18, 19) having a display panel (R) 11, a display panel (G) 12, and a display panel (B) 13 enclosing cholesteric liquid crystal (hereinafter referred to as “liquid crystal”) 20, 21, 22 Full color is realized by stacking these three sheets together.

The three display panels 11, 12, 13 have liquid crystal 20, 21, 22 layers provided between two films (14, 15) (16, 17) (18, 19), respectively. .
In the laminated panel 10 of the present embodiment, three display panels 11, 12, and 13 each having layers of liquid crystals 20, 21, and 22 are combined into display areas 32, 32, and 32 (hereinafter referred to as “display areas”). 32 ”), and is laminated via an adhesive sheet 26 as an adhesive layer for adhering only an area smaller than an area surrounded by the seal wall 24.

  The adhesive sheet 26 is interposed between the display panel 11 and the display panel 12 and between the display panel 12 and the display panel 13. In addition, the pressure-sensitive adhesive sheet 26 is disposed only in an area that is the same as or larger than the display area 32 of each display panel 11, 12, 13 and smaller than the area surrounded by the seal wall 24.

  As the pressure-sensitive adhesive sheet 26, an acrylic adhesive, a photo-curing adhesive such as an ultraviolet (UV) curing type or a visible light curing type is used. The adhesive is not limited to an acrylic adhesive or a photo-curing adhesive, but an adhesive suitable for the film material and the manufacturing method is selected and applied in a timely manner.

Next, FIG. 8 is a cross-sectional view showing a state of stress applied to the laminated panel 10 under a low temperature environment, and FIG. 9 is a cross-sectional view of the laminated panel 10 under a low temperature environment.
FIG. 8 shows a state in which the adhesive sheet 26 is interposed only in each display area 32 of each display panel 11, 12, 13 constituting the laminated panel 10. In this state, it is assumed that the ambient environment of the laminated panel 10 has become a low temperature.

  Then, in the low temperature environment, the respective liquid crystals 20, 21, 22 of the display panels 11, 12, 13 contract. In this case, as shown by the arrows in FIG. 8, the films (14, 15), (16, 17), (18, 19) in the respective display areas 32 of the display panels 11, 12, and 13 The stress pulled in the direction (thickness direction) acts.

  The film portion 38 on the outer peripheral side of the display region 32 is subjected to stress that is pulled in the vertical direction (thickness direction) in the figure, and the seal wall 24 in the peripheral portion has the display panels 11, 12, 13. Stress that contracts in the left-right direction (horizontal direction) acts toward the center.

  In this case, the seal wall 24 outside the display area 32 is hardened and thus does not deform. On the other hand, the film portions 38 outside the display areas 32 of the display panels 11, 12, 13 are not bonded and can be independently deformed. For this reason, the film part 38 outside the display area 32 of each display panel 11, 12, 13 can be deformed by the stress in the vertical direction.

  Thus, as shown in FIG. 9, the film portions 38 outside the display areas 32 of the display panels 11, 12, and 13 have the recesses (28a, 28b) (29a, 29b) (30a, 30b) due to stress. Is formed. As a result, the portions of the liquid crystal 20, 21, 22 that are deformed in a concave shape outside the display area 32 move to the liquid crystal 20, 21, 22 side of the display area 32.

(Manufacturing method of laminated panel)
Next, a method for manufacturing the laminated panel 10 by bonding the display panels 11, 12, and 13 through the adhesive sheet 26 will be described.

FIG. 10 is a plan view of a laminated panel, FIG. 11 is a plan view of an adhesive sheet, and FIG. 12 is a plan view of a state in which the adhesive sheet is attached to the display panel.
In the present embodiment, when each display panel 11, 12, 13 is bonded via the adhesive sheet 26, the entire display surface is not bonded, but a necessary portion of the display panel 11, 12, 13, that is, a display area. The adhesive sheet 26 is affixed only to 32 (specifically, only an area slightly larger than the display area 32).

  In FIG. 10, the size of the display area 32 is width W (approximately 123.633 mm) × height H (approximately 164.849 mm), and the width w from the display area 32 to the panel edge (approximately 8.68 mm). X Height H (approximately 10.06 mm).

  The reason why the size of the display area 32 is shown to 1/1000 mm is that, for example, the size of one pixel is about 0.15 mm, and the size tolerance and the tolerance at the time of pasting are taken into consideration.

Moreover, in FIG. 11, the size of the adhesive sheet 26 is width W (approximately 125 mm) × height H (approximately 166 mm).
That is, the pressure-sensitive adhesive sheet 26 is slightly larger than the display area 32 (the width W is approximately 1.367 mm larger and the height H is approximately 1.151 mm larger).

As shown in FIG. 12, the adhesive sheet 26 is attached only to the display areas 32 of the two display panels 11 and 12.
Note that the temperature at which low-temperature foaming occurs varies depending on the temperature and volume at the time of injecting the liquid crystals 20, 21, and 22, and cannot be defined unconditionally.

  Next, FIG. 13 is a diagram showing a flowchart of a method for manufacturing a laminated panel. 14 is a cross-sectional view of a state where the adhesive sheet 26 is attached only to the display area 32 of the display panel 11, FIG. 15 is a diagram showing a positioning process when the adhesive sheet 26 is attached, and FIG. FIG. 17 is a cross-sectional view of a state in which the display panel 12 is pressed on the panel 11 and FIG. FIG. 18 is a cross-sectional view of a state in which the third display panel 13 is pressed against the upper display panel 12 in a state where the two display panels 11 and 12 are stacked.

  Hereinafter, based on the flowchart of FIG. 13, the manufacturing method of the laminated panel 10 of this Embodiment is demonstrated, referring FIGS. 14-18.

(1) As shown in S10 of FIG. 13 and FIG. 14, the adhesive sheet 26 is attached only to the display area 32 of the upper film 15 of the display panel (R) 11.
In this case, as shown in FIG. 15, positioning at the time of sticking of the adhesive sheet 26 is performed by using a microscope at the four corners (corner portions) of the adhesive sheet 26 and the corner portions of the display area 32 of the target display panel (R) 11. Look and align with the virtual extension line of the display area (the border line of the adhesive sheet application area) (the adhesive area of the adhesive sheet 26 covers the entire display area 32). In addition, it is preferable to perform bonding in a vacuum from a viewpoint of preventing mixing of a bubble.

(2) As shown in S11 of FIG. 13 and FIG. 16, the lower film 16 of the display panel (G) 12 is stacked and pressed on the upper film 15 of the display panel (R) 11.
At this time, when the pressure-sensitive adhesive sheet 26 is heated and solidified, the pressure-sensitive adhesive sheet 26 is heated. Further, if the pressure-sensitive adhesive sheet 26 can be bonded without being heated, it may be simply pressed. Further, if the pressure-sensitive adhesive sheet 26 is cured by irradiation with light such as ultraviolet rays or visible rays, the ultraviolet rays or visible rays are irradiated.

(3) As shown in S12 of FIG. 13 and FIG. 17, in the state where (display panel (R) 11 + display panel (G) 12) is laminated, the display area 32 of the upper film 17 of the display panel (G) 12 Adhesive sheet 26 is affixed only to.
Also in this case, as described above, the positioning at the time of attaching the adhesive sheet 26 is performed while viewing with a microscope.

(4) As shown in S13 of FIG. 13 and FIG. 18, in the state of (display panel (R) 11 + display panel (G) 12), the display panel (B) 13 is placed on the upper film 17 of the display panel (G) 12. The lower film 18 is stacked and pressed.
Also in this case, as described above, when the pressure-sensitive adhesive sheet 26 is solidified by heating, the pressure-sensitive adhesive sheet 26 is heated and irradiated with light if it is cured by light irradiation.

  As described above, according to the present embodiment, each display panel 11, 12, 13 is laminated via the adhesive sheet 26 that bonds only the respective display areas 32. Each film (14, 15), (16, 17), (18, 19) of the portion can move freely, and low-temperature foaming of the liquid crystals 20, 21, 22 in the respective display regions 32 can be suppressed.

Since the adhesive sheet 26 is used for pasting, the display panels 11, 12, and 13 can be laminated with a uniform thickness.
Furthermore, in the present embodiment, when the three display panels 11, 12, and 13 are bonded, only the display areas 32 are bonded and stacked with the adhesive sheet 26, so that the size corresponds to, for example, the display area 32. Since the adhesive sheet 26 may be prepared in advance and attached to the panel, workability can be improved.

(Modification 1)
Next, FIG. 19 is an external view when the sealing material 40 is applied and formed in a broken line shape like a bank at a position corresponding to the peripheral seal 37 of the adhesive sheet 26 (display region 32), and FIG. FIG.

  As shown in FIGS. 19 and 20, for example, the adhesive sheet 26 is attached only to the display area 32 of the upper film 15 of the display panel 11, and further, for example, at a position corresponding to the peripheral seal 37 on the outside of the liquid crystal 20. Then, the sealing material 40 is applied or formed in a linear shape or a broken line shape (FIG. 19 shows a state where the sealing material 40 is applied in a broken line shape). A dispenser 52 is used for applying the sealing material 40.

FIG. 21 is a cross-sectional view when the sealing material 40 is applied and formed in a broken line shape like a bank in the vicinity of the adhesive sheet 26 (display region 32).
As shown in FIG. 21, for example, an adhesive sheet 26 is attached only to the display area 32 of the upper film 15 of the display panel 11, and the sealing material 40 is linearly or brokenly adjacent to the adhesive sheet 26 (display area 32). It may be applied or formed.

  In this way, the display panel 12 is attached to the upper surface (upper film 15) of the display panel 11. A similar sealing material 40 is formed and pasted between the display panel 12 and the display panel 13. The sealing material 40 is provided for improving impact resistance.

  As the sealing material 40, for example, a thermosetting adhesive or a photocurable adhesive is used. Moreover, if this sealing material 40 is a photocurable adhesive, for example, the display panel 11 and the display panel 12 are overlapped, and then the sealing material 40 is irradiated with light and cured.

  According to the present embodiment, only the display area 32 of each display panel 11, 12, 13 is firmly adhered, and the sealing material 40 provided on a straight line or a broken line around or close to the display area 32. Therefore, it is possible to improve impact resistance against dropping and vibration while suppressing low-temperature foaming.

(Modification 2)
FIG. 22 is a plan view of the state in which the adhesive 42 is printed on the display panel 11, and FIG. 23 is a cross-sectional view thereof.

  In this case, as in the first modification, the adhesive 42 is printed only on the display area 32 of the display panel 11, and further, for example, at a position corresponding to the peripheral seal 37 on the outside of the liquid crystal 20, for example, linear or broken line The sealing material 40 is applied or formed in a shape. A dispenser 52 is used for applying the sealing material 40.

  The adhesive 42 needs to be a printable material. For example, an acrylic adhesive or a photo-curing adhesive may be used. Also in this case, the adhesive 42 is printed slightly larger than the display area 32.

FIG. 24 is a cross-sectional view when the sealing material 40 is applied and formed in a broken line shape like a bank in the vicinity of the printed adhesive 42 (display area 32).
As shown in FIG. 24, for example, the adhesive 42 is printed only on the display area 32 of the upper film 15 of the display panel 11, and the sealing material 40 is linearly or closely adjacent to the printed adhesive 42 (display area 32). You may apply or form in the shape of a broken line.

Next, the display panel 12 is overlaid and bonded to the display panel 11. At this time, it is preferable to bond them in a vacuum environment.
Similarly, the adhesive 43 is printed only on the display area 32 of the attached display panel 12. In this way, next, the display panel 13 is overlapped and bonded to the display panel 12.

  According to the present embodiment, since the adhesive 42 is printed only on the display region 32 of the display panel 11, it is possible to adhere to a uniform thickness and to suppress low-temperature foaming.

(Modification 3)
FIG. 25 is a plan view showing a state in which a bank is formed around the display area 32 with the sealing material 40 and the adhesive 42 is filled therein.

  In FIG. 25, the sealing material 40 is drawn in a frame shape using a dispenser (not shown) so as to surround the display area 32 of the display panel 11. As this sealing material 40, for example, a photo-curing adhesive is used. The size of the sealing material 40 is slightly larger than the display area 32. For example, the sealing material 40 is cured by irradiation with visible light.

  Subsequently, the adhesive 42 is dropped into the display area 32 surrounded by the sealing material 40 using a dispenser. Here, for example, the adhesive 42 is a visible light curable adhesive having a low viscosity.

  Next, the display panel 12 is covered from above the display panel 11 and pressed and bonded. At this time, it is preferable to press and bond together in a vacuum environment. By this pressing, a part of the adhesive 42 spreads uniformly. Thereby, the air in the sealing material 40 is also pushed by the adhesive 42 and pushed out of the sealing material 40.

Next, after bonding the display panel 11 and the display panel 12, the adhesive 42 is hardened by visible light, for example.
According to the present embodiment, since the periphery of the display area 32 of the display panel 11 is surrounded by the sealing material 40 and the adhesive 42 is dropped and adhered to the inside thereof, the adhesive 42 does not stick out and low temperature foaming is performed. Can be suppressed.

[Second Embodiment]
26 to 28 are sectional views of the laminated panel according to the second embodiment. FIG. 26 is a sectional view of the laminated panel at room temperature, and FIG. 27 is a stress applied to the laminated panel in a low temperature environment. FIG. 28 is a sectional view showing a state, and FIG. 28 is a sectional view of a laminated panel in a low temperature environment. In addition, the same code | symbol is attached | subjected to the same or equivalent member as 1st Embodiment, and the description is abbreviate | omitted.

In the present embodiment, the laminated panel 10 composed of the three display panels 11, 12, 13 is sandwiched between the two protective plates 44, 45 from the upper and lower sides.
In this case, only the display area 32 between the laminated panel 10 and the protective plates 44 and 45 sandwiching them is adhered by the adhesive sheet 26 or the like, as in the case described above. Also in this case, the adhesive sheet 26 and the like are bonded to an area slightly larger than the display area 32.

  Also in the present embodiment, only the display area 32 of each display panel 11, 12, 13 is adhered, and the portion outside the display area 32 can freely move. For this reason, even under a low temperature environment, the film portion 38 outside the display region 32 can follow the thermal contraction of the liquid crystals 20, 21, 22 and suppress low temperature foaming.

  In the present embodiment, as shown in FIG. 26, only the display area 32 of each of the three display panels 11, 12, 13, between the protection plate 44 and the display panel 11, and between the protection plate 45 and the display panel 13. Only the display area 32 between them is adhered by the adhesive sheet 26.

  As a result, as shown in FIG. 27, the liquid crystals 20, 21, 22 of the display panels 11, 12, 13 contract in a low temperature environment. In this case, as shown by the arrows in FIG. 27, the films (14, 15), (16, 17), (18, 19) in the display area 32 of the display panels 11, 12, 13 are arranged in the vertical direction ( The stress pulled in the thickness direction) acts.

  Further, the film portion 38 outside the display area 32 is subjected to a stress that is pulled in the vertical direction (thickness direction) in the figure, and the seal wall 24 in the peripheral portion has the center of each display panel 11, 12, 13. A stress that contracts in the left-right direction (horizontal direction) acts toward.

  In this case, the seal wall 24 outside the display area 32 is hardened and thus does not deform. On the other hand, the film portion 38 outside the display area 32 of each display panel 11, 12, 13 can be independently deformed because it is not bonded. For this reason, each film (14, 15) (16, 17) (18, 19) outside the display area 32 is deformed by stress in the vertical direction or the like.

  Thus, as shown in FIG. 28, the recesses (28a, 28b) (29a, 29b) (30a, 30b) are formed in the respective films (14, 15), (16, 17), (18, 19) outside the display area 32. ) Is formed. Thus, the deformed liquid crystal 20, 21, 22 outside the display area 32 moves to the liquid crystal 20, 21, 22 side of the display area 32.

For this reason, low-temperature foaming of the liquid crystals 20, 21, 22 in the display region 32 is suppressed.
The method of attaching the adhesive sheet 26 and the like are in principle the same as those described in the first embodiment, and thus description thereof is omitted here.

  In the present embodiment, the case where the three-layer display panels 11, 12, and 13 are sandwiched between the protection plates 44 and 45 has been described. However, the present invention is not limited to this. For example, even when a display panel having only one layer is sandwiched between the protective plates 44 and 45, the protective plates 44 and 45 are attached only to the display areas 32 of the upper film and the lower film of the display panel, thereby causing low-temperature foaming. Can be suppressed.

  Furthermore, also in the present embodiment, as shown in FIG. 19 described above, the sealing material 40 may be formed in a linear shape or a broken line shape like a bank around the adhesive sheet 26 (display region 32).

  According to the present embodiment, the protective film 44 is attached to the lower film 14 of the display panel 11 only on the display area 32 via the adhesive sheet 26, and the display film 13 is also displayed on the upper film 19 of the display panel 13. Since the protective plate 45 is attached only to the region 32 via the adhesive sheet 26, low-temperature foaming of the liquid crystals 20, 21, 22 can be suppressed.

[Third Embodiment]
29 to 32 are views showing the laminated panel according to the third embodiment, in which FIG. 29 is a sectional view of the laminated panel, FIG. 30 is outside the display area 32 of the display panel 11, and FIG. 31 is a cross-sectional view of the process of applying the sealing material 40 on the inner side of the seal wall 24 and filling the liquid 50 therein, and FIG. 31 is outside the display region 32 of the display panel 12 and inside the seal wall 24. FIG. 32 is a cross-sectional view of the step of applying the sealing material 40 to the inside and filling the liquid 50 inside thereof, and FIG. 32 is a plan view thereof.

In addition, the same code | symbol is attached | subjected to the same or equivalent member as 1st Embodiment, and the description is abbreviate | omitted.
In the present embodiment, as shown in FIG. 29, the laminated panel 10 includes three display panels 11, 12, and 13 that are larger than the respective display areas 32 and enclose the inside of the seal wall 24. Then, the liquid 50 was filled inside the sealing material 40.

  As shown in FIG. 30, the manufacturing method applies a sealing material 40 to a position close to the display area 32 of the upper film 15 of the display panel 11, and similarly, as shown in FIG. The sealing material 40 is applied on the inner side of the sealing wall 24 which is larger than the display area 32 of the film 17 and filled with the liquid 50 inside each sealing material 40.

  In this case, by using the dispenser 52, the sealing material 40 is drawn in a frame shape at positions close to the display areas 32 of the upper films 15 and 17 of the display panel 11 and the display panel 12, respectively. Also in this case, drawing is performed while the display area 32 and the sealing material 40 are aligned using a microscope. As this sealing material 40, for example, a photo-curing adhesive may be used.

  Subsequently, using the dispenser 52, the liquid 50 is dropped on the inner side of the upper film 15 of the display panel 11 and the upper film 17 of the display panel 12 surrounded by the sealing material 40. As the liquid 50, it is preferable to use a liquid close to the refractive index (for example, 1.15) of the liquid crystal so that display unevenness does not occur. As the liquid 50, for example, silicon oil, Teflon (registered trademark) oil, or the like is used.

  As the liquid 50, an elastic gel-like liquid may be used. When an elastic gel-like liquid is used and its fluidity is small (when it does not spread on the panel after application), the sealing material 40 is applied intermittently (broken line shape).

  Next, as shown in FIG. 32, the display panel 12 is overlaid and bonded onto the display panel 11. Similarly, after the display panel 12 is put on the display panel 11, the display panel 13 is put on the display panel 12.

  Thereafter, the sealing material 40 is cured by irradiating, for example, visible light toward the sealing material 40. Thus, the portion to which the sealing material 40 is applied is bonded (fixed). However, the portion of the display area 32 is not bonded, and a layer of the liquid 50 is provided.

As described above, since the liquid 50 is sandwiched between the display panels 11, 12, and 13, the portions other than the seal material 40 of the display panels 11, 12, and 13 are not bonded.
That is, if the entire panel surfaces of the stacked display panels 11, 12, and 13 are bonded, the intermediate display panel 12 is affected by the upper and lower display panels 11 and 13 so that the display panel 12 in a low temperature environment is affected. The liquid crystal 20, 21, 22 cannot follow the thermal contraction, and low temperature foaming occurs in the display panel 12.

  According to the present embodiment, the display panels 11, 12, and 13 are bonded and stacked by the sealing material 40 that surrounds only the respective display areas 32, and the liquid 50 is filled inside the sealing material 40. Low temperature foaming can be suppressed.

  In addition, the sealing material 40 is applied in the vicinity of the display area 32 of each display panel 11, 12, 13, and further, the sealing material 40 is doubled continuously or intermittently with a predetermined interval outside the sealing material 40. Sealing material 40 may be applied. Thereby, the impact resistance with respect to dropping etc. can be improved.

  In this embodiment, since the liquid 50 is filled inside the sealing material 40, if the sealing material 40 is accurately positioned and applied, the amount of liquid 50 set in advance is uniformly filled. Work is easy.

Claims (7)

A plurality of display panels having a liquid crystal layer in which a flexible film is bonded by a seal wall provided on an outer peripheral portion of the flexible film and liquid crystal is sealed inside the seal wall.
A laminated panel characterized by being laminated through an adhesive layer that adheres only to an area that is the same as or larger than a display area of each of the display panels and that is smaller than an area surrounded by the seal wall. The laminated panel and a protective plate that sandwiches the laminated panel are bonded to each other through the adhesive layer only in an area that is the same as or larger than the display area and smaller than an area surrounded by the seal wall. The laminated panel according to claim 1. The laminated panel according to claim 1, wherein the adhesive layer is made of a photocurable adhesive. The laminated panel according to claim 1 or 2, wherein the outer peripheral side of the adhesive layer is bonded to the adhesive layer with a sealing material arranged in a straight line or a broken line with a predetermined interval. A plurality of display panels having a liquid crystal layer in which a flexible film is bonded by a seal wall provided on an outer peripheral portion of the flexible film and liquid crystal is sealed inside the seal wall.
Adhering and laminating with a sealing material that surrounds only an area that is the same as or larger than the display area of each of the display panels and smaller than the area surrounded by the seal wall, and the inside of the seal material is filled with liquid A laminated panel characterized by that. A plurality of display panels having a liquid crystal layer in which a flexible film is bonded by a seal wall provided on an outer peripheral portion of the flexible film and liquid crystal is sealed inside the seal wall are prepared. Process,
Laminating via an adhesive layer that adheres only to a region that is the same or larger than the display region of each of the display panels and that is smaller than a region surrounded by the seal wall;
And a step of curing the adhesive layer. A method for producing a laminated panel, comprising: A plurality of display panels having a liquid crystal layer in which a flexible film is bonded by a seal wall provided on an outer peripheral portion of the flexible film and liquid crystal is sealed inside the seal wall are prepared. Process,
Adhering and laminating with a sealing material that surrounds only a region that is the same or larger than the display region of each of the display panels and that is smaller than a region surrounded by the seal wall; and
Curing the sealing material;
And a step of filling the inside of the sealing material with a liquid.

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