JP2012168348A - Liquid crystal display element and method for manufacturing liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress degradation in image quality by birefringence or the like without increasing the cost.SOLUTION: A first region on a semiconductor substrate 3 enclosing a display region is laminated on a second region on a transparent electrode 5 corresponding to the first region with a sealing part 21, while keeping a predetermined gap between the regions. The sealing part 21 has a successively layered structure including a strong adhesive sealing material 22a, a highly flexible sealing material 23 and a strong adhesive sealing material 22b. By using the strong adhesive sealing materials 22a, 22b, moisture resistance on interfaces of the sealing materials with upper and lower substrates is improved. By interposing the highly flexible sealing material 23 between the strong adhesive sealing materials 22a, 22b, physical and chemical bonds between the sealing part 21 and the upper and lower substrates are weakened to decrease birefringence.

Description

  The present invention relates to a liquid crystal display element and a method for manufacturing the liquid crystal display element, and more particularly to a reflective liquid crystal display element and a method for manufacturing the liquid crystal display element.

  Projection-type liquid crystal display devices such as projectors and projection televisions are widely used as displays capable of displaying images on a large screen with high definition. The liquid crystal display element used in the projection type liquid crystal display device generally includes a transmission type in which light incident from one of the liquid crystal display elements is transmitted through the liquid crystal display element and emitted to the other, and one of the liquid crystal display elements. There is a reflection type in which the light incident from is reflected by the liquid crystal display element and emitted to the incident side.

  Although transmissive liquid crystal display elements tend to be inferior in aperture ratio compared to reflective liquid crystal display elements, there is a merit that the optical system combined at the time of projection can be simplified because the light incident and exit surfaces are different. .

  On the other hand, the reflective liquid crystal display element is more advantageous than the transmissive liquid crystal display element in realizing high resolution without reducing the aperture ratio. In addition, in a reflective liquid crystal display element, a MOS transistor corresponding to each pixel is generally disposed on a silicon-based semiconductor substrate, a metal wiring is provided on the upper layer, and a reflective electrode pixel is formed thereon.

  FIG. 4 is a schematic cross-sectional view of an example of a conventional reflective liquid crystal display element. As shown in FIG. 4, a conventional reflective liquid crystal display element 1 includes a semiconductor substrate 3 in which a plurality of pixel electrodes 2 having light reflectivity are formed in a predetermined range on a surface, and a surface (in FIG. A transparent substrate 4 having a light transmitting property on a transparent electrode 5 having a light transmitting property (corresponding to the lower surface of the substrate 4) has a gap A so that the pixel electrode 2 and the transparent electrode 5 face each other. A liquid crystal 8 is filled in the gap A, which is disposed between the seal portion 7, the upper and lower transparent substrates 5, and the semiconductor substrate 3. The seal portion 7 is formed so as to finally surround a predetermined range of the surface of the semiconductor substrate 3.

  In addition, an alignment film 9 is formed on the semiconductor substrate 3 so as to cover at least a predetermined range of the surface thereof. In addition, an alignment film 10 is formed on the transparent substrate 4 to cover the transparent electrode 5 in a range corresponding to at least the predetermined range on the surface. An antireflection film 11 is formed on the back surface of the transparent substrate 4 (corresponding to the upper surface of the transparent substrate 4 in FIG. 4). In the reflective liquid crystal display element 1, the predetermined range is a display area for displaying an image. The length of the gap A is called a cell gap.

  In addition, since the light which injects into this liquid crystal display element 1 is not perfect parallel light, it will be irradiated to element parts other than a display area as it is. In particular, the light that hits the seal portion 7 has a random polarization direction, so that it shines brightly even in a non-driven state, resulting in a very poor image quality. For this reason, the reflective liquid crystal display element 1 has an aperture corresponding to the display area, and an aperture mask 12 that is a black plate that does not reflect light is placed above the antireflection film 11, thereby reducing the image quality. The structure is such that light does not enter the region.

  Here, in general, the liquid crystal often dislikes impurities entering from the outside. For this reason, the reflective liquid crystal display element 1 is bonded between the semiconductor substrate 3 and the transparent electrode 5 via the seal portion 7, and the semiconductor substrate Since the liquid crystal 8 is sealed in the space between the transparent electrode 5 and the transparent electrode 5, the sealing portion 7 is particularly required to have a high barrier property. Moisture is considered as an impurity that enters the liquid crystal cell in a normal environment, and the seal portion 7 has high moisture resistance for preventing moisture from entering.

  However, although the moisture resistance of the seal portion 7 itself is very high, it is difficult to completely suppress moisture entering from the interface with the substrate to be bonded, and some moisture exists as impurities. There is a good correlation between the amount of entering water and the seal portion 7, and in particular, the material and width of the seal portion 7 are important factors that determine moisture resistance.

  As a means for improving moisture resistance, there is a method using a second seal as shown in Patent Document 1. However, this method is difficult to perform in all surface directions because the end surface on the wiring side interferes with wire bonding. In addition, since the cleaning process must be performed to remove contamination and foreign matter due to liquid crystal injection or substrate separation, the moisture adsorbed on the seal cannot be completely removed, and the effect of moisture remaining inside the second seal. It is difficult to escape.

  The greatest effect on moisture resistance is the width of the seal portion 7 formed in a region sandwiched between the semiconductor substrate 3 on which the pixel electrode 2 is formed and the transparent electrode 5 formed on the transparent electrode 4. The degree of adhesion. This is because the most moisture permeates from each interface between the seal portion 7 and the semiconductor substrate 3 and the seal portion 7 and the transparent electrode 5, and there is almost no moisture passing through the seal portion 7 in the experiment. That is, since moisture permeates from the interface portion between the seal portion 7 having weak adhesion and the semiconductor substrate 3 and the transparent electrode 5, the moisture resistance is improved unless the interface is firmly adhered or an obvious interface is not formed. .

JP 2009-080396 A

  By the way, normally, when high moisture resistance is required for the seal portion 7 itself, it is necessary to closely contact the interface between the seal portion 7, the transparent electrode 5, and the semiconductor substrate 3. The hardness of is likely to be high. However, if the adhesive is bonded too firmly, birefringence occurs in the transparent substrate 4 due to shrinkage of the adhesive itself or stress due to the difference in thermal expansion coefficient between the transparent electrode 5 and the semiconductor substrate 3 to be bonded, resulting in display quality. Will be lowered. On the other hand, if a flexible material, for example, a material containing a large amount of rubber material or the like is used to reduce the stress in the seal portion 7, in many cases, the adhesive strength is insufficient, and the intrusion of moisture from the above-mentioned interface. It will be easy.

  The width of the seal portion 7 is also a very large factor that determines moisture resistance. Basically, the diffusion of moisture tends to be inversely proportional to the square of the width of the seal portion 7, and it is very significant how much width can be secured. Further, when considering the stress applied by the seal portion 7, when the seal thickness is thin and the width is widened, the two substrates 3 and 4 have a reduced degree of freedom, and birefringence is likely to occur.

  In recent years, liquid crystal display elements are highly demanded for cost reduction, and it is necessary to lower the unit cost per chip by increasing the pixel density and increasing the number of arrangements per wafer by downsizing the pixels. From such a point of view, the seal width cannot be widened and efforts have been made to secure the moisture resistance and reliability expected by the performance improvement of the seal portion 7 and the application position management of the seal portion 7. However, considering the current performance of the seal portion 7 and the moisture resistance obtained thereby, it has been difficult to make significant improvements, and it is particularly difficult to achieve it while satisfying all of the conventional required performance.

  Further, the performance required for recent liquid crystal display elements includes high-speed response, high contrast, and reduction of disclination amount, all of which are directed toward narrowing the cell gap of the liquid crystal display element. However, as described above, the seal portion 7 having high moisture resistance tends to have a high hardness, and when the thickness of the seal portion 7 is reduced to narrow the cell gap, the degree of freedom between the substrates 3 and 4 is relatively increased. However, it is easy to cause deterioration in image quality due to birefringence, and it is difficult to easily improve the material of the seal portion 7.

  Further, due to the demand for cost reduction, it is required to increase the number of semiconductor substrates 3 on which the pixel electrodes 2 are formed per wafer, and it is difficult to obtain the width of the seal portion 7 for ensuring moisture resistance. It has become. Moreover, in order to improve the moisture resistance of the seal part 7 itself, it is necessary to use a material having high hardness, and it is difficult to suppress the influence of birefringence.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid crystal display element and a method for manufacturing the liquid crystal display element in which deterioration of image quality due to birefringence or the like is suppressed without increasing cost.

  In order to achieve the above object, a liquid crystal display element according to the present invention includes a semiconductor substrate having a display region on which a plurality of pixel electrodes are formed on the surface, and light arranged to face the plurality of pixel electrodes with a predetermined gap. A transparent substrate having light transmittance on which one transparent electrode having transparency and conductivity is formed, a first region on a semiconductor substrate surrounding a display region, and a transparent electrode corresponding to the first region A sealing portion having a structure in which two or more different sealing materials are laminated, and a liquid crystal filled in the predetermined gap. And

  In order to achieve the above object, in the liquid crystal display element of the present invention, the sealing portion is bonded to the semiconductor substrate rather than a predetermined reference sealing material in which one surface is bonded to the first region of the semiconductor substrate. A first strong adhesive seal material having high properties, and a second strong adhesive seal material having one surface bonded to the second region of the transparent electrode and having higher adhesion to the transparent electrode than a predetermined reference seal material; , Higher flexibility than a predetermined standard sealing material provided between the first and second strong adhesive sealing materials and joined to each other surface of the first and second strong adhesive sealing materials It is characterized by comprising a sealing material.

  In order to achieve the above object, in the liquid crystal display element of the present invention, the bonding between each of the other surfaces of the first and second strong adhesive sealing materials and the highly flexible sealing material is performed by irradiation with ultraviolet light. It is characterized by being carried out by curing the first and second strong adhesion sealing materials and the highly flexible sealing material.

  In order to achieve the above object, a method of manufacturing a liquid crystal display element according to the present invention includes a display region forming step of forming a display region in which a plurality of pixel electrodes are arranged on the surface of a semiconductor substrate, and a light transmission property. A transparent electrode forming step of forming a transparent electrode having optical transparency and conductivity in a region corresponding to the display region on one surface of the transparent substrate, and a first region on the semiconductor substrate surrounding the display region; The pixel electrode and the transparent electrode are spaced apart from each other and the second region on the transparent electrode corresponding to the first region, and there are two or more different sealing materials having a predetermined gap. It is characterized by including a joining step of bonding together by a seal portion having a laminated structure, and a liquid crystal filling step of filling a predetermined gap with liquid crystal.

  In order to achieve the above object, in the method for manufacturing a liquid crystal display element of the present invention, the bonding step described above is more adhesive to the first region of the semiconductor substrate than to a predetermined reference sealing material. A first bonding step for bonding one surface of the first strong adhesive sealing material having a high level, and a second strong material having higher adhesiveness to the transparent electrode than the predetermined reference sealing material in the second region of the transparent electrode. A high-flexibility sealing material having a higher flexibility than a predetermined reference sealing material is provided on the other surface of one of the first and second strong-adhesive sealing materials, and a second adhesion step for adhering one surface of the adhesive sealing material. It includes a high flexibility sealing material forming step to be formed, and a sealing material joining step for joining each other surface of the first and second strong adhesion sealing materials to the high flexibility sealing material.

  In order to achieve the above object, in the method of manufacturing a liquid crystal display element of the present invention, the sealing material joining step includes the other surfaces of the first and second strong adhesive sealing materials, the highly flexible sealing material, The first and second strong adhesive seal materials and the highly flexible seal material are irradiated with ultraviolet light on the first and second strong adhesive seal materials and the highly flexible seal material, respectively, in a state where they are in contact with each other. And are cured and bonded.

  The high flexibility sealing material forming step may be a step of forming the high flexibility sealing material on the other surface of one of the first and second strong adhesion sealing materials using a screen printing method. .

  According to the present invention, it is possible to suppress deterioration in image quality without increasing productivity due to deterioration in productivity or reduction in the number of pixel electrode substrates.

It is typical sectional drawing of one Embodiment of the liquid crystal display element of this invention. 1 is a schematic plan view of an embodiment of a liquid crystal display element of the present invention. It is typical element sectional drawing of each process of one Embodiment of the manufacturing method of the liquid crystal display element of this invention. It is typical sectional drawing of an example of the conventional liquid crystal display element.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic sectional view of an embodiment of a liquid crystal display element according to the present invention, and FIG. 2 is a schematic plan view of an embodiment of a liquid crystal display element according to the present invention. In both drawings, the same components are denoted by the same reference numerals.

  As shown in FIG. 1, the liquid crystal display element 20 of the present embodiment is a reflective liquid crystal display element, and a semiconductor substrate 3 having a display area on the surface of which a plurality of pixel electrodes 2 having light reflectivity are formed in a matrix. And a transparent substrate 4 having a light transmission property in which a transparent electrode 5 having light transparency and conductivity is formed on one surface, and a transparent antireflection film 11 is formed on the other surface, is a pixel electrode. 2 and the transparent electrode 5 are disposed so as to face each other so as to face each other, and are bonded together with an air gap A called a cell gap by an annular seal portion 21 that surrounds the display region via the alignment films 9 and 10. The gap A has a structure in which the liquid crystal 8 is filled.

  The semiconductor substrate 3 on which the pixel electrode 2 and the alignment film 9 are formed constitutes a pixel electrode substrate. In addition, as shown in FIG. 2, a display area of a predetermined range D in which a plurality of pixel electrodes 2 are arranged in a matrix is formed in the center of the semiconductor substrate 3 and further covers the surface of the display area. The alignment film 9 shown in FIG. 1 is formed. In addition, a drive circuit unit 24 is formed around the display region of the predetermined range D, and further includes a part of the drive circuit unit 24, and an annular seal unit 21 is provided so as to surround the display region of the predetermined range D and the alignment film 9. Is formed. The liquid crystal display element 20 of the present embodiment is characterized in that the seal portion 21 has a laminated structure of two or more different sealing materials.

  Further, adjacent to the drive circuit portion 24, a wire-bonding pad arrangement region 25 that electrically connects the liquid crystal display element 20 and the outside, which is not shown in FIG. 1, is formed. 1 is formed to cover the surface of the transparent electrode 5 in a range corresponding to the predetermined range D shown in FIG. The transparent substrate 11 on which the transparent electrode 5 and the antireflection film 11 are formed, the alignment film 10 and the pixel electrode substrate can be formed using a known method for manufacturing a liquid crystal display element.

  In FIG. 2, in the liquid crystal display element 20, a region necessary for projection, that is, a region for displaying an image is a display region of a predetermined range D, and a surrounding region is originally not required for projection display. In practice, for high-quality image display, the drive circuit unit 24 and the seal unit 21 are generally used so as to always display black and make the display area stand out.

  Next, the seal part 21 which constitutes a main part of the present invention will be described. The surface of the seal portion 21 is required to be substantially parallel to the pixel surface. The reason is that it is necessary to stably obtain various characteristics determined by the cell gap and to reduce the unevenness of the screen luminance due to the in-plane gap thickness unevenness. Therefore, it is necessary to flatten the seal portion 21 once and align it with the same height as the pixel surface.

  In addition, as shown in FIG. 1, the liquid crystal display element 20 of the present embodiment has a structure in which a seal portion 21 is laminated in the order of a strong adhesive seal material 22a, a highly flexible seal material 23, and a strong adhesive seal material 22b. is there. The strong adhesion sealing materials 22a and 22b are sealing materials having higher adhesion to the semiconductor substrate 3 and the transparent electrode 5 than the sealing material used in the conventional sealing portion 7 as a reference sealing material, for example, A thermosetting epoxy resin containing no acrylic or the like is used. The highly flexible sealing material 23 is a sealing material having higher flexibility than the above standard sealing material, and for example, a material containing a large amount of acrylic or rubber is used.

  The reason why the seal portion 21 has the above structure is as follows. The largest parts of the moisture intrusion path from the outside to the liquid crystal layer are the interface (adhesion surface) between the seal portion and the transparent electrode 5 and the interface (adhesion surface) between the seal portion and the semiconductor substrate 1 itself. Has already been confirmed from the fact that moisture resistance is improved by using a highly adhesive material as a sealing material. However, if a sealing material with high adhesiveness is used, the physical / chemical bond between the sealing material and the transparent electrode 5 or the semiconductor substrate 1 is strengthened, so that the material shrinks when bonded, and the upper and lower substrates (the transparent electrode 5 and the semiconductor substrate). Birefringence, which is a major problem due to the difference in thermal expansion coefficient from 1), is caused.

  Therefore, in the liquid crystal display element 20 of the present embodiment, the strong adhesive seal material 22 a is used as the seal material that adheres to the semiconductor substrate 1, and the strong adhesive seal material 22 b is used as the seal material that adheres to the transparent electrode 5. The use improves the moisture resistance at the interface between the sealing material and the upper and lower substrates, and the high-flexibility sealing material 23 is sandwiched between the strong adhesive sealing materials 22a and 22b so that the entire sealing material (seal portion 21) Weakens the physical and chemical bond between the transparent electrode 5 and the semiconductor substrate 1 and reduces birefringence. For the high-flexibility sealing material 23, a material that includes some of the basic components of the strong-adhesive material is selected, and before the hard-adhesive sealing materials 22a and 22b are completely cured, the high-flexibility sealing material 23 is sandwiched between them. Thus, it is possible to manufacture the seal portion 21 having almost no boundary.

  Next, the manufacturing method of the liquid crystal display element 20 of this Embodiment is demonstrated with the element sectional drawing of each process of FIG.

  First, as shown in FIG. 3A, a pixel electrode substrate including a semiconductor substrate 3 on which at least a display area of a predetermined range D shown in FIG. 2 is formed by a known method, and a transparent electrode substrate including a transparent substrate 4 And prepare. In the display area, a plurality of rectangular pixel electrodes 2 having light reflectivity are formed in a matrix. Each pixel electrode 2 constitutes each pixel together with a transistor and a storage capacitor (not shown). Note that the configuration of the pixel is well known and has no direct relationship with the present invention, and thus the description thereof is omitted. The transparent electrode substrate has a structure in which the transparent electrode 5 is coated on one surface of the cleaned transparent substrate 5 and the antireflection film 11 is coated on the other surface.

  Next, as shown in FIG. 3B, an alignment film 9 is formed at a position corresponding to the display area of the predetermined range D including the plurality of pixel electrodes 2 by a known method, and the display area of the transparent electrode 5 is formed. The alignment film 10 is formed in the corresponding region.

  Next, as shown in FIG. 3C, an annular strong adhesive sealing material 22a is bonded to the first region surrounding the display region on the semiconductor substrate 1 outside the alignment film 9 by a known method (for example, a screen). Print using a printing device). On the other hand, an annular strong adhesive seal material 22b is bonded to the second region corresponding to the strong adhesive seal material 22a on the transparent electrode 4 outside the alignment film 10 by a known method (for example, printing using a screen printing apparatus). To do). It should be noted that spacer balls having a predetermined diameter may be mixed in the strong adhesive seal materials 22a and 22b.

  Next, as shown in FIG. 3D, before the strong adhesive sealing materials 22a and 22b are completely cured, an annular highly flexible sealing material 23 having the same diameter as the strong adhesive sealing materials 22a and 22b is, for example, strongly bonded. A coating is formed on the adhesive sealing material 22a. The coating formation of the highly flexible sealing material 23 on the highly adhesive sealing material 22a can be performed using, for example, a screen printing apparatus. The highly flexible sealing material 23 may be formed on the strong adhesive sealing material 22b.

  Then, as shown in FIG. 3E, the pixel electrode 2 covered with the alignment film 9 and the transparent electrode 5 covered with the alignment film 10 approach each other in the direction in which the highly flexible sealing material 23 is formed. The high-flexibility sealing material 23 and the strong adhesive seal material 22b are irradiated with ultraviolet (UV) light 29 and cured while applying pressure in a state where the adhesive and the strong adhesive seal material 22b are overlapped. As a result, the seal portion 21 having a structure in which the strong adhesive seal material 22a, the high-flexibility seal material 23, and the strong adhesive seal material 22b are stacked in this order is formed, and along with the formation of the seal portion 21, the pixel electrode substrate and the counter electrode The substrate is bonded. At this time, the seal part 21 can set the distance of the cell gap A according to the diameter of the spacer ball.

  The shape of the seal portion 21 cured at this time leaves a gap for injecting liquid crystal later when the periphery of the plurality of pixel electrodes 2 in the display area (corresponding to the predetermined area D in FIG. 2) is completely covered. Two types of cases are conceivable. When completely covering, before superimposing the pixel electrode substrate and the counter electrode substrate, an amount of liquid crystal corresponding to the volume of the space formed between the pixel electrode substrate and the counter electrode substrate is placed on one of the substrates. It is necessary to supply in advance.

  Further, an ordinary sealing material uses 3000 mJ in terms of 365 nm as an energy necessary for curing the sealing material, and cures the sealing material by UV light irradiation for about 30 seconds using a 100 mW UV light source.

  After the seal portion 21 is formed by UV light irradiation as described above, the seal portion 21 is introduced into a commonly used liquid crystal injection device, and the liquid crystal is introduced into the alignment film 9 from the gap for injecting the previous liquid crystal using a vacuum injection method. Injection is performed in a gap surrounded by the alignment film 10 and the seal portion 21. After injecting the liquid crystal, a sealing material is applied again in the gap between the seal portions 21 into which the liquid crystal has been injected, and is cured and completely sealed. Thereafter, the liquid crystal and other foreign matters adhering to the periphery are removed.

  After that, an FPC (Flexible Printed Circuit) for connecting to the external drive substrate is attached, and the liquid crystal display element and the FPC are electrically connected by wire bonding or the like, as shown in FIGS. 1 and 2 of the present embodiment. A liquid crystal display element 20 similar to the above is completed.

  As described above, according to the liquid crystal display element 20 of the present embodiment, the seal portion 21 is bonded to the semiconductor substrate 1 and the transparent electrode 5 with the strong adhesive seal materials 22a and 22b and the high sandwiched therebetween. The three-layer structure composed of the flexible sealing material 23 improves the moisture resistance at the interface between the sealing material and the upper and lower substrates, and weakens the physical and chemical bonds with the transparent electrode 5 and the semiconductor substrate 1. Refraction can be reduced, and thereby deterioration in image quality can be suppressed without increasing productivity due to deterioration in productivity or reduction in the number of pixel electrode substrates.

  Note that the present invention is not limited to the above embodiment, and for example, the present invention can be applied to a transmissive liquid crystal display element. Further, the adhesion surface between the strongly adhesive sealing material 22 a and the semiconductor substrate 3 may be configured to be lower than the formation surface of the alignment film 9 in the semiconductor substrate 3 by a predetermined height.

DESCRIPTION OF SYMBOLS 2 Pixel electrode 3 Semiconductor substrate 4 Transparent substrate 5 Transparent electrode 8 Liquid crystal 9, 10 Orientation film 11 Antireflection film 20 Liquid crystal display element 21 Sealing part 22a, 22b Strong adhesion sealing material 23 High flexible sealing material 24 Drive circuit part

Claims (7)

A semiconductor substrate having a display region having a plurality of pixel electrodes formed thereon,
A transparent substrate having a light transmitting property, wherein a transparent electrode having a light transmitting property and a conductive property disposed on a surface of the plurality of pixel electrodes with a predetermined gap therebetween is formed;
Two layers are bonded to each other between the first region on the semiconductor substrate surrounding the display region and the second region on the transparent electrode corresponding to the first region with the predetermined gap. A seal portion having a structure in which the above different seal materials are laminated;
A liquid crystal display element comprising: a liquid crystal filled in the predetermined gap. The seal portion is
A first strong adhesive sealing material having one surface bonded to the first region of the semiconductor substrate and having higher adhesion to the semiconductor substrate than a predetermined reference sealing material;
A second strongly-adhesive sealing material having one surface bonded to the second region of the transparent electrode and having higher adhesion to the transparent electrode than the predetermined reference sealing material;
Provided between the first and second strong adhesive seal materials and more flexible than the predetermined reference seal material joined to each other surface of the first and second strong adhesive seal materials The liquid crystal display element according to claim 1, comprising a highly flexible sealing material.   Bonding between the other surfaces of the first and second strong adhesive seal materials and the high flexibility seal material is performed by irradiating ultraviolet light with the first and second strong adhesion seal materials and the high flexibility seal material. The liquid crystal display element according to claim 2, wherein the liquid crystal display element is formed by curing. A display region forming step of forming a display region in which a plurality of pixel electrodes are arranged on a surface of a semiconductor substrate;
A transparent electrode forming step of forming a transparent electrode having optical transparency and conductivity in a region corresponding to the display region on one surface of the transparent substrate having optical transparency;
The pixel electrode and the transparent electrode are spaced apart from each other between a first region on the semiconductor substrate surrounding the display region and a second region on the transparent electrode corresponding to the first region. And a bonding step having a predetermined gap and pasting together with a seal portion having a structure in which two or more different sealing materials are laminated,
And a liquid crystal filling step of filling the predetermined gap with liquid crystal. The joining step includes
A first bonding step of bonding, to the first region of the semiconductor substrate, one surface of a first strong-bonding sealing material having higher adhesion to the semiconductor substrate than a predetermined reference sealing material;
A second bonding step of bonding one surface of a second strong adhesive sealing material having higher adhesion to the transparent electrode than the predetermined reference sealing material to the second region of the transparent electrode;
A highly flexible sealing material forming step for forming a highly flexible sealing material having higher flexibility than the predetermined reference sealing material on the other surface of one of the first and second strong adhesive sealing materials;
The method for manufacturing a liquid crystal display element according to claim 4, further comprising: a sealing material joining step for joining each other surface of the first and second strong adhesive sealing materials and the highly flexible sealing material. The sealing material joining step includes
In the state where the other surfaces of the first and second strong adhesion sealing materials are in contact with the high flexibility sealing material, the first and second strong adhesion sealing materials and the high flexibility sealing material are used. 6. The method of manufacturing a liquid crystal display element according to claim 5, wherein the first and second strong adhesion sealing materials and the highly flexible sealing material are cured and bonded to each other by irradiating ultraviolet light. .   The high-flexibility sealing material forming step forms the high-flexibility sealing material on the other surface of one of the first and second strong adhesion sealing materials by using a screen printing method. 4. A method for producing a liquid crystal display element according to 4.

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