TW202004299A - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device comprising: first and second substrates (11, 12); a liquid crystal layer (13), sandwiched between the first and second substrates (11, 12); a first sealing material (21), surrounding the liquid crystal The layer (13), which seals the liquid crystal layer (13) between the first and second substrates (11, 12); and the second sealing material (22), surrounds the first sealing material (21) at intervals.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device.

Liquid crystal display devices are not only used in daily life forms such as clocks or computers, but also in vehicle-mounted devices that require high reliability. Vehicle-mounted liquid crystal display devices are subject to severe environmental conditions, so the reliability test before product shipment must be conducted under severe conditions. Reliability testing includes environmental testing.

For a typical liquid crystal display device, when an environmental test maintained in a high temperature and high humidity environment for a long period of time is carried out, moisture will penetrate the sealing material of the liquid crystal display device, and moisture will penetrate into the liquid crystal layer. As a result of the decrease in the resistivity of the liquid crystal layer due to this moisture, a region in which the capacitance retention rate decreases will occur. As a result, display failure may occur in the liquid crystal display device.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 4302381

[Patent Document 2] Japanese Patent Laid-Open No. 2005-156752

The present invention aims to provide a liquid crystal display device with higher reliability.

A liquid crystal display device according to an aspect of the present invention includes: first and second substrates; a first liquid crystal layer sandwiched between the first and second substrates; a first sealing material surrounding the first liquid crystal layer, and the first The liquid crystal layer is sealed between the first and second substrates; and the second sealing material surrounds the first sealing material with a gap.

According to the present invention, a liquid crystal display device with higher reliability can be provided.

10‧‧‧Liquid crystal display device

11‧‧‧ First substrate (TFT substrate)

12‧‧‧Second substrate (CF substrate)

13, 23‧‧‧ liquid crystal layer

14‧‧‧Switching element (TFT)

15‧‧‧Insulation

16‧‧‧Pixel electrode

17‧‧‧Contact plug (contact hole)

18‧‧‧Color filter

18-R‧‧‧Red filter

18-G‧‧‧green filter

18-B‧‧‧Blue filter

19‧‧‧ Black matrix (shading layer)

20‧‧‧Common electrode

21‧‧‧First sealing material

21A, 21B‧‧‧Sealing material

22‧‧‧Second sealing material

22A, 22B‧‧‧Sealing material

24‧‧‧Enclosure

26‧‧‧Filling layer

27‧‧‧Air layer

28, 28A, 28B‧‧‧Sealing material

FIG. 1 is a plan view of the liquid crystal display device of the first embodiment.

2 is a cross-sectional view of the liquid crystal display device along line AA ' of FIG.

3 is an explanatory diagram of a specific cross-sectional structure of a liquid crystal display device.

4 is a plan view of a liquid crystal display device of a comparative example.

5 is a plan view of a liquid crystal display device of a second embodiment.

6 is a plan view of a liquid crystal display device of a third embodiment.

7 is a plan view of a liquid crystal display device of a fourth embodiment.

8 is a cross-sectional view of the liquid crystal display device along line BB ' of FIG.

9 is a plan view of a liquid crystal display device of a fifth embodiment.

10 is a cross-sectional view of the liquid crystal display device along line AA ' of FIG.

11 is a plan view of a liquid crystal display device of a sixth embodiment.

12 is a cross-sectional view of the liquid crystal display device along line AA ' of FIG.

13 is a plan view of a liquid crystal display device of a seventh embodiment.

14 is a cross-sectional view of the liquid crystal display device along line AA ' of FIG.

[Form for carrying out the invention]

Hereinafter, embodiments will be described with reference to the drawings. Among them, the drawings are schematic or conceptual, and the sizes and proportions of the drawings are not necessarily the same as the actual products. Furthermore, even when the drawings show the same parts, there may be cases where the dimensional relationships or ratios of each other are different. In particular, the following several embodiments are examples of devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is not specified by the shape, structure, arrangement, etc. of component parts. In addition, in the following description, elements having the same function and configuration are all given the same symbols, and the description will be repeated only when necessary.

[1] The first embodiment [1-1] Configuration of liquid crystal display device 10

FIG. 1 is a plan view of a liquid crystal display device 10 of the first embodiment. 2 is a cross-sectional view of the liquid crystal display device 10 along line AA ' of FIG. In addition, in the top view of FIG. 1, in order to easily understand the configuration of the present invention, the sealing material and the sealing material are indicated by solid lines, and the liquid crystal layer is indicated by dotted hatching. The top view other than FIG. 1 is the same.

The liquid crystal display device 10 includes a TFT substrate 11 on which TFTs, pixel electrodes, etc. are formed, and a color filter substrate (CF substrate) 12 on which color filters and common electrodes are formed, and is disposed opposite to the TFT substrate 11. Each of the TFT substrate 11 and the CF substrate 12 is composed of a transparent substrate (for example, a glass substrate or a plastic substrate).

The liquid crystal layer 13 is filled between the TFT substrate 11 and the CF substrate 12. Specifically, the liquid crystal layer 13 is enclosed in the area surrounded by the TFT substrate 11 and the CF substrate 12 and the sealing materials 21 and 22. The specific configuration of the sealing materials 21 and 22 will be described later.

In the liquid crystal material constituting the liquid crystal layer 13, the alignment of the liquid crystal molecules operates according to the electric field applied between the TFT substrate 11 and the CF substrate 12, thereby changing the optical characteristics. The liquid crystal mode can be applied to various liquid crystal modes such as VA (Vertical Alignment) mode, TN (Twisted Nematic) mode, and homogeneous mode.

A plurality of switching elements (not shown) corresponding to the plurality of pixels are provided on the liquid crystal layer 13 side of the TFT substrate 11. The plurality of pixels are arranged in an array. The configuration of the switching element will be described later. An insulating layer 15 is provided on the plurality of switching elements.

A plurality of pixel electrodes 16 corresponding to the plurality of pixels are provided on the insulating layer 15. One pixel electrode 16 is provided in substantially the entirety of one pixel area.

A color filter (not shown) is provided on the liquid crystal layer 13 side of the CF substrate 12. The configuration of the color filter will be described later.

A common electrode 20 is provided on the color filter. The common electrode 20 is formed in a plane shape over the entire display area of the liquid crystal display device 10.

(Specific cross-sectional structure of the liquid crystal display device 10)

3 is an explanatory diagram of a specific cross-sectional structure of the liquid crystal display device 10. FIG. 3 is a cross-sectional view of a part of the display area with the inner side removed from the sealing materials 21 and 22, and is a cross-sectional view along the X direction.

A plurality of switching elements 14 corresponding to the plurality of pixels are provided on the liquid crystal layer 13 side of the TFT substrate 11. For the switching element 14, for example, TFT (Thin Film Transistor) is used, and n-channel TFT is used. In FIG. 3, the TFT 14 is shown in simplified form. Specifically, the TFT 14 includes a gate electrode functioning as a scan line, a gate insulating film provided on the gate electrode, a semiconductor layer (for example, an amorphous silicon layer) provided on the gate insulating film, and a portion The source electrode and the drain electrode which are in contact with the semiconductor layer and are provided separately from each other. The source electrode is electrically connected to the signal line (not shown).

A contact plug (contact hole) 17 electrically connected to the pixel electrode 16 is provided in the insulating layer 15 and on the drain electrode of the TFT 14.

An alignment film (not shown) that controls the initial alignment of the liquid crystal layer 13 is provided on the insulating layer 15 and on the plurality of pixel electrodes 16.

The color filter 18 is provided on the liquid crystal layer 13 side of the CF substrate 12. The color filter 18 includes a plurality of colored filters (colored members), specifically, a plurality of red filters 18-R, a plurality of green filters 18-G, and a plurality of blue filters Tablet 18-B. A general color filter is composed of three primary colors of light: red (R), green (G), and blue (B). The three adjacent colors R, G, and B constitute a display unit (pixel), and any single-color portion of R, G, and B in a pixel is the smallest driving unit commonly known as a sub-pixel (sub-pixel). The TFT 14 and the pixel electrode 16 are provided for each sub-pixel. In this specification, the difference between a pixel and a sub-pixel is referred to as a sub-pixel unless otherwise necessary.

A black matrix (light shielding layer) for light shielding is provided at the boundary portion of the red filter 18-R, the green filter 18-G, and the blue filter 18-B, and the boundary portion of the pixel (sub-pixel) 19. That is, the black matrix 19 is formed in a mesh shape. The black matrix 19 has a function of shielding unnecessary light between colored members and enhancing contrast, for example.

An alignment film (not shown) for controlling the initial alignment of the liquid crystal layer 13 is provided on the common electrode 20.

The pixel electrode 16, the contact plug 17, and the common electrode 20 are made of transparent electrodes, and for example, ITO (Indium Tin Oxide) is used. The insulating layer 15 uses a transparent insulating material, for example, silicon nitride (SiN).

[1-2] Specific structure of sealing materials 21 and 22

The specific structure of the sealing materials 21 and 22 will be described with reference to FIGS. 1 and 2.

The sealing material 21 is provided in contact with the insulating layer 15 and the CF substrate 12. The sealing material 21 is, for example, frame-shaped and has a quadrangular shape. That is, the sealing material 21 includes two sides extending in the X direction and two sides extending in the Y direction orthogonal to the X direction. The inner area of the sealing material 21 serves as a display area where images can be displayed.

The sealing material 22 is provided in contact with the insulating layer 15 and the CF substrate 12. The sealing material 22 is, for example, frame-shaped and has a quadrangular shape. The sealing material 22 is configured to surround the sealing material 21. The sealing material 22 is spaced apart from the sealing material 21 and is arranged outside the sealing material 21.

The liquid crystal layer 23 is provided between the sealing material 21 and the sealing material 22. The liquid crystal layer 23 belongs to the same material as the liquid crystal layer 13, for example.

The sealing material 21 has, for example, an injection port (opening) for injecting liquid crystal at the center of the upper side (the side extending in the X direction) of FIG. 1. The inlet of the sealing material 21 is constituted by two sealing materials 21A and 21B extending from a part of the rectangular sealing material in the Y direction. The sealing materials 21A and 21B extend to the end of the TFT substrate 11.

The sealing material 22 has, for example, an injection port for injecting liquid crystal in the center of the upper side (the side extending in the X direction) of FIG. 1. The injection port of the sealing material 22 is constituted by two sealing materials 22A and 22B extending in the Y direction from a part of the rectangular sealing material. The sealing materials 22A and 22B extend to the end of the TFT substrate 11.

The sealing materials 21 and 22 are formed by printing, for example. The sealing material is made of, for example, ultraviolet-curing resin, thermosetting resin, or ultraviolet-heat combined curing resin, etc., and is printed on the TFT substrate 11 and/or CF substrate 12 during the manufacturing process, and then irradiated with ultraviolet light, or heated, etc. Harden it.

The sealing material 24 is used to close the inlet of the sealing material 21 and the inlet of the sealing material 22. The sealing material 24 is made of, for example, ultraviolet curing resin. The sealing material 24 is applied after the liquid crystal is injected between the TFT substrate 11 and the CF substrate 12 so as to fill the inlet of the sealing material 21 and the inlet of the sealing material 22. Then, the sealing material 24 is hardened by ultraviolet irradiation.

The liquid crystal injection method can be, for example, a vacuum injection method. The vacuum injection method is to inject liquid crystal from the injection ports of the sealing materials 21 and 22.

In the liquid crystal display device 10 configured in this manner, it is possible to suppress the penetration of moisture into the liquid crystal layer 13 from the outside.

[1-3] Modification

The outer sealing material 22 can also be made of a material with high barrier properties. The sealing material 22 is composed of a sealing material containing an inorganic material. For the inorganic material, a material that does not penetrate moisture can be selected. The inner sealing material 21 is made of, for example, resin.

In the modification, the barrier property of the sealing material 22 can be further improved. In this way, it is possible to further suppress the penetration of moisture into the liquid crystal layer 13.

[1-4] Comparative example

4 is a plan view of a liquid crystal display device of a comparative example.

The liquid crystal layer 13 is sealed between the TFT substrate 11 and the CF substrate 12 with a layer of sealing material 22. The inlet of the sealing material 22 is closed by the sealing material 24.

The liquid crystal display device may be mounted in, for example, a vehicle with severe use environment. The liquid crystal display device for vehicles is required to have high reliability. Therefore, reliability tests (environmental tests) should be conducted under more severe conditions.

In one example of the environmental test, a test for maintaining a high-temperature and high-humidity environment (for example, 85 degrees, 85% RH (relative humidity)) at 2000 hr (hours) was carried out.

In the liquid crystal display device of the comparative example, as shown in FIG. 4, at a time point after hundreds of hours have passed, electrostatic capacity retention has occurred in a part of the display area (in particular, four corners of the sealing material 22 near the sealing material 22) The rate of decrease. This is because the moisture permeates into the liquid crystal layer 13 through the sealing material 22 in a high-temperature and high-humidity environment, and the resistivity of the liquid crystal decreases due to the moisture, which lowers the electrostatic capacity retention rate.

In the region where the electrostatic capacity retention rate decreases, the electric field applied to the liquid crystal layer is low, making it difficult to control the alignment of the liquid crystal layer. As a result, in the liquid crystal display device of the comparative example, normal display operation cannot be realized.

On the other hand, the liquid crystal display device 10 of this embodiment has a structure in which moisture hardly penetrates into the liquid crystal layer 13 from the outside. For example, since the moisture penetrating the sealing material 22 is absorbed by the liquid crystal layer 13, it is possible to suppress the moisture from penetrating into the liquid crystal layer 13 via the sealing material 21.

[1-5] Effect of the first embodiment

As described in detail above, in the first embodiment, the liquid crystal display device 10 includes: a liquid crystal layer 13 sandwiched between the TFT substrate 11 and the CF substrate 12; a sealing material 21 surrounding the liquid crystal layer 13 to seal the liquid crystal layer 13 on the TFT substrate 11 and the CF substrate 12; the sealing material 22, which surrounds the sealing material 21 at an interval; and the liquid crystal layer 23, which is provided between the sealing materials 21 and 22.

For example, when an environmental test is performed on the liquid crystal display device 10, the moisture penetrating the outer sealing material 22 is absorbed by the liquid crystal layer 23 and blocked by the sealing material 22. By this action, the penetration of moisture into the liquid crystal layer 13 can be suppressed. According to the first embodiment, it is possible to suppress the liquid crystal display device 10 from becoming defective, and it is possible to realize a highly reliable liquid crystal display device 10. The liquid crystal display device 10 of the present embodiment is particularly effective for applications requiring high reliability such as in-vehicle use.

In addition, the inlet of the sealing material 21 and the inlet of the sealing material 22 are arranged at the same position. With this configuration, the injection steps of the liquid crystal layers 13 and 23 can be performed together. Furthermore, two liquid crystal layers 13 and 23 can be closed using one sealing material 24. As a result, it is possible to suppress the increase in the manufacturing process.

[2] Second embodiment

5 is a plan view of the liquid crystal display device 10 of the second embodiment.

The sealing material 21 has an opening 21C at the center of the lower side (the side extending in the X direction) of FIG. 5. Unlike the first embodiment, the sealing material 21 does not have an injection port at the center of the upper side (the side extending in the X direction) of FIG. 5.

The sealing material 22 has an injection port at the center of the upper side (the side extending in the X direction) of FIG. 5. Liquid crystal is injected into the space between the TFT substrate 11 and the CF substrate 12 through the injection port of the sealing material 22. The liquid crystal injected into the sealing material 22 is further injected into the sealing material 21 through the opening 21C of the sealing material 21. The sealing material 24 closes the inlet of the sealing material 22.

Moisture may infiltrate a lot from the vicinity of the sealing material 24. In the second embodiment, since the opening 21C of the sealing material 21 is arranged at many positions based on the inlet of the sealing material 22, the moisture that has penetrated into the liquid crystal layer 23 from the vicinity of the sealing material 24 penetrates into the inside of the sealing material 21 Can be suppressed.

[3] Third embodiment

6 is a plan view of a liquid crystal display device 10 of a third embodiment.

In the third embodiment, the liquid crystal display device 10 does not include the sealing material 24 for liquid crystal sealing shown in the first embodiment.

The sealing material 21 is, for example, frame-shaped and has a quadrangular shape. The sealing material 21 does not have an injection port for injecting liquid crystal. The sealing material 22 is, for example, frame-shaped and has a quadrangular shape. The sealing material 22 does not have an injection port for injecting liquid crystal. A liquid crystal layer 23 is provided between the sealing material 21 and the sealing material 22.

The third embodiment uses the ODF (one drop fill) method as the liquid crystal injection method. In the case of the ODF method, no liquid crystal injection port is required. In the ODF method, the sealing material is printed on one or two substrates, and the liquid crystal fills the area surrounded by the sealing material. Then, the two substrates are bonded.

In the third embodiment, since there is no sealing material, it is possible to prevent the penetration of moisture from the vicinity of the sealing material.

[4] Fourth embodiment

7 is a plan view of a liquid crystal display device 10 of a fourth embodiment. FIG. 8 is a cross-sectional view of the liquid crystal display device 10 taken along the line BB ′ of FIG. 7.

The sealing material 21 has, for example, an injection port for injecting liquid crystal at the center of the right side (the side extending in the Y direction) of FIG. 1. The injection port of the sealing material 21 is composed of two sealing materials 21A and 21B extending from a part of the rectangular sealing material in the X direction. The sealing materials 21A and 21B extend to the end of the TFT substrate 11.

The sealing material 22 has, for example, an injection port for injecting a substance in the center of the upper side (the side extending in the X direction) of FIG. 1. The inlet of the sealing material 22 is composed of two sealing materials 22A and 22B extending in the Y direction from the center of the upper side of the sealing material 22. The sealing materials 22A and 22B extend to the end of the TFT substrate 11. The right side of the sealing material 22 is partitioned by the sealing materials 21A and 21B, and the partition portion of the sealing material 22 contacts the sealing materials 21A and 21B.

Between the sealing material 21 and the sealing material 22, a filling layer (absorbent material) 26 is provided, which is composed of a substance different from the liquid crystal layer 13 and has water absorption. The filling layer 26 has a function of absorbing moisture that has penetrated the sealing material 22. The filling layer 26 can be exemplified by silicone rubber for the individual, and polyvinyl alcohol, polyethylene glycol, or the like for the polymer.

The liquid crystal layer 13 is injected from the injection port of the sealing material 21. The filling layer 26 is injected from the injection port of the sealing material 22.

The sealing material 25 closes the inlet of the sealing material 21. The sealing material 24 closes the inlet of the sealing material 22. The sealing materials 24 and 25 are made of, for example, ultraviolet curing resin.

In the fourth embodiment, the moisture that has penetrated through the sealing material 22 is absorbed by the filling layer 26. In this way, the penetration of moisture into the liquid crystal layer 13 can be suppressed.

[5] Fifth embodiment

9 is a plan view of a liquid crystal display device 10 of a fifth embodiment. 10 is a cross-sectional view of the liquid crystal display device 10 taken along line AA ' of FIG.

The shapes of the sealing materials 21 and 22 are the same as in the third embodiment.

An air layer 27 is provided between the sealing material 21 and the sealing material 22. That is, nothing is injected between the sealing material 21 and the sealing material 22.

The outer sealing material 22 is made of a material with high barrier properties, for example, a sealing material containing an inorganic material. The inner sealing material 21 is made of, for example, resin.

The fifth embodiment uses the ODF method as the liquid crystal injection method. In the fifth embodiment, the penetration of water into the liquid crystal layer 13 can also be suppressed.

[6] Sixth embodiment

11 is a plan view of a liquid crystal display device 10 of a sixth embodiment. 12 is a cross-sectional view of the liquid crystal display device 10 taken along line AA ' of FIG.

The liquid crystal display device 10 includes three layers of sealing materials 21, 22, and 28.

The sealing material 28 is provided in contact with the insulating layer 15 and the CF substrate 12. The sealing material 28 is, for example, frame-shaped and has a quadrangular shape. The sealing material 28 is configured to surround the sealing material 22. The sealing material 28 is spaced apart from the sealing material 22 and is arranged outside the sealing material 22. A liquid crystal layer 29 is provided between the sealing material 22 and the sealing material 28.

The sealing material 28 has an injection port for injecting liquid crystal at the same position as the injection ports of the sealing materials 21 and 22. That is, the inlet of the sealing material 28 is composed of two sealing materials 28A and 28B extending from the center of the upper side of the sealing material 28 in the Y direction. The sealing materials 28A and 28B extend to the end of the TFT substrate 11.

According to the sixth embodiment, since the liquid crystal display device 10 is provided with three sealing materials 21, 22, 28 and two liquid crystal layers 23, 29, the infiltration of moisture into the liquid crystal layer 13 can be further suppressed.

[7] Seventh embodiment

13 is a plan view of the liquid crystal display device 10 of the seventh embodiment. 14 is a cross-sectional view of the liquid crystal display device 10 taken along line AA ' of FIG.

The liquid crystal display device 10 includes three layers of sealing materials 21, 22, and 28.

An air layer 27 is provided between the sealing material 21 and the sealing material 22. That is, nothing is injected between the sealing material 21 and the sealing material 22. For example, the air layer 27 is sealed by the sealing material 21 and the sealing material 22.

The sealing materials 21 and 28 have injection ports for injecting liquid crystal at the same position (for example, the center of the upper side of FIG. 1 ).

The upper side of the sealing material 22 is partitioned by the sealing materials 21A and 21B, and the partition portion of the sealing material 22 is in contact with the sealing materials 21A and 21B.

In the seventh embodiment, the penetration of water into the liquid crystal layer 13 can also be suppressed.

In addition, the above-mentioned first to seventh embodiments can be combined as appropriate. For example, among the plural sealing materials of the first to seventh embodiments, one or two or more sealing materials having an inorganic material may be used. In addition, in the liquid crystal layers of the first to seventh embodiments, a filling layer having water absorption may be used.

In addition, the type of liquid crystal display device is not limited, and it can be applied to various liquid crystal display devices. For example, the liquid crystal display device may be a simple array type. In this case, the sealing material is configured to be in contact with two opposing substrates.

The present invention is not limited to the above-mentioned embodiment, and the constituent elements can be changed and embodied without departing from the gist of the present invention. Furthermore, the above-mentioned embodiments include inventions of various stages, and various inventions can be constituted by appropriate combinations of a plurality of constituent elements disclosed in one embodiment or appropriate combinations of constituent elements disclosed in different embodiments. For example, even if some components are deleted from all the components disclosed in the embodiment, the problem to be solved by the invention can be solved, and when the effects of the invention are obtained, the embodiment after deleting these components must be extracted as the invention.

10‧‧‧Liquid crystal display device

11‧‧‧ First substrate (TFT substrate)

12‧‧‧Second substrate (CF substrate)

13, 23‧‧‧ liquid crystal layer

15‧‧‧Insulation

21‧‧‧First sealing material

21A, 21B‧‧‧Sealing material

22‧‧‧Second sealing material

22A, 22B‧‧‧Sealing material

24‧‧‧Enclosure

Claims (13)

A liquid crystal display device comprising: first and second substrates; a first liquid crystal layer sandwiched between the first and second substrates; a first sealing material surrounding the first liquid crystal layer to seal the first liquid crystal layer in The space between the first and second substrates and the second sealing material surround the first sealing material with a gap. The liquid crystal display device according to claim 1, further comprising a second liquid crystal layer provided between the first and second sealing materials. The liquid crystal display device according to claim 2, wherein the first sealing material has a first opening, and the first liquid crystal layer and the second liquid crystal layer are continuous through the first opening. The liquid crystal display device according to claim 3, wherein the second sealing material has a second opening for injecting liquid crystal, and the first opening is disposed on the side of the first sealing material away from the second opening. The liquid crystal display device according to claim 2, wherein the first sealing material has a first opening for injecting the first liquid crystal layer, and the second sealing material has a second opening for injecting the second liquid crystal layer, The first opening and the second opening are arranged at the same position. The liquid crystal display device according to any one of claims 1 to 5, wherein the second sealing material contains an inorganic material. The liquid crystal display device according to claim 1, further comprising a filling layer which is provided between the first and second sealing materials and is made of a material different from the first liquid crystal layer. The liquid crystal display device according to claim 7, wherein the first sealing material has a first opening for injecting the first liquid crystal layer, and the second sealing material has a second opening for injecting the filling layer, the first The first opening and the second opening are arranged at different positions. The liquid crystal display device according to claim 1, further comprising a third sealing material that surrounds the second sealing material at an interval. The liquid crystal display device according to claim 9, further comprising: a second liquid crystal layer provided between the first and second sealing materials; and a third liquid crystal layer provided between the second and third sealing materials. The liquid crystal display device according to claim 10, wherein the first sealing material has a first opening for injecting the first liquid crystal layer, and the second sealing material has a second opening for injecting the second liquid crystal layer, The third sealing material has a third opening for injecting the third liquid crystal layer, and the first opening, the second opening, and the third opening are arranged at the same position. The liquid crystal display device according to claim 9, further comprising: an air layer provided between the first and second sealing materials; and a second liquid crystal layer provided between the second and third sealing materials. The liquid crystal display device according to claim 12, wherein the first sealing material has a first opening for injecting the first liquid crystal layer, and the third sealing material has a second opening for injecting the second liquid crystal layer, The first opening and the second opening are arranged at the same position, and the air layer is closed by the first sealing material and the second sealing material.

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