JP2020071421A - Method for manufacturing liquid crystal display device and liquid crystal display device - Google Patents

Abstract

To provide a method for manufacturing a liquid crystal display device and the like capable of suppressing a decrease in quality of a display image.SOLUTION: A method for manufacturing a liquid crystal display device includes a joining step of manufacturing a liquid crystal module 2 by joining a first display panel 100 and a second display panel 200 or a transparent substrate 600 by a joining member 500 composed of a photocurable resin and an aging step of subjecting the liquid crystal module 2 to aging by irradiating the liquid crystal module with visible light.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a method for manufacturing a liquid crystal display device and a liquid crystal display device.

  A liquid crystal display device using a display panel including a liquid crystal cell is used as a display such as a television or a monitor. However, the liquid crystal display device has a lower contrast ratio than an organic EL (Electro Luminescence) display device.

  Therefore, conventionally, as a technique for improving the contrast ratio of a liquid crystal display device, a technique has been proposed in which two display panels are overlapped and an image is displayed on each display panel (for example, Patent Document 1). This technique displays a color image on the front side (observer side) display panel of the two display panels arranged in front and back, and a black and white image on the rear side (backlight side) display panel. Thus, the contrast ratio is improved.

  In this case, the two display panels are made of, for example, an optically transparent adhesive sheet (OCA: Optically Clear Adhesive) or an optically transparent adhesive resin (OCR: Optically Clear Resin) formed of an ultraviolet curable resin or a thermosetting resin. It is pasted together using a joining member.

JP, 2011-076107, A

  However, in a liquid crystal display device having two display panels joined by a joining member, a frame-shaped luminance unevenness may occur in the peripheral region (peripheral portion) of the display screen during energization due to long-term use. As a result, the quality of the display image of the liquid crystal display device deteriorates.

  The present disclosure has been made to solve such a problem, and an object of the present disclosure is to provide a method for manufacturing a liquid crystal display device and the like that can suppress deterioration of the quality of a display image.

  One mode of a method for manufacturing a liquid crystal display device according to the present disclosure is a bonding method for manufacturing a liquid crystal module by bonding a first display panel and a second display panel or a transparent substrate with a bonding member made of a photocurable resin. And an aging step in which the liquid crystal module is irradiated with visible light to perform aging.

  One mode of a liquid crystal display device according to the present disclosure is a liquid crystal module having a first display panel and a second display panel joined by a joining member, and a backlight arranged on the second display panel side of the liquid crystal module. And an aging process of displaying a black image on the first display panel and irradiating the liquid crystal module with light of the backlight.

  According to the present disclosure, it is possible to suppress the occurrence of frame-shaped luminance unevenness in the peripheral area of the display screen, and thus it is possible to suppress deterioration of the quality of the display image.

1 is a diagram showing a schematic configuration of a liquid crystal display device according to a first embodiment. FIG. 3 is a cross-sectional view showing the configuration of the liquid crystal display device according to the first embodiment. FIG. 6 is a diagram for explaining a joining step in the method of manufacturing the liquid crystal display device according to the first embodiment. FIG. 7 is a diagram for explaining an aging step in the method of manufacturing the liquid crystal display device according to the first embodiment. FIG. 5 is a diagram schematically showing a specific example of an aging step in the method of manufacturing the liquid crystal display device according to the first embodiment. FIG. 9 is a diagram schematically showing a specific example of an aging step in the method of manufacturing the liquid crystal display device according to the first modification of the first embodiment. FIG. 9 is a diagram schematically showing a specific example of an aging step in the method of manufacturing a liquid crystal display device according to the second modification of the first embodiment. FIG. 9 is a diagram schematically showing a specific example of a first aging step in the aging step of the method for manufacturing the liquid crystal display device according to the second embodiment. FIG. 9 is a diagram schematically showing a specific example of a second aging step in the aging step of the method for manufacturing the liquid crystal display device according to the second embodiment. FIG. 9 is a diagram schematically showing a specific example of a first aging step in the aging step of the method for manufacturing a liquid crystal display device according to the modification of the second embodiment. FIG. 13 is a diagram schematically showing a specific example of a second aging step in the aging step of the method for manufacturing the liquid crystal display device according to the modification of the second embodiment. FIG. 9 is a diagram schematically showing a specific example of an aging step in the method of manufacturing the liquid crystal display device according to the third embodiment. FIG. 13 is a diagram schematically showing a specific example of an aging step in the method of manufacturing a liquid crystal display device according to the modification of the third embodiment. FIG. 13 is a cross-sectional view schematically showing a specific example of an aging step in the method of manufacturing the liquid crystal display device according to the fourth embodiment. It is sectional drawing which shows the structure of the liquid crystal display device which concerns on a modification. It is a figure which shows typically the frame-shaped brightness unevenness which arose on the display screen of a liquid crystal display device. When a liquid crystal display device having a first display panel and a second display panel bonded together by a bonding member is used for a long time, the end regions of the bonding member shrink and the thicknesses of the first liquid crystal cell and the second liquid crystal cell. It is a figure which shows the mode that F changes. FIG. 15A is a diagram showing a two-dimensional luminance distribution when a liquid crystal display device in which a frame-shaped luminance unevenness actually occurs is measured by a two-dimensional luminance meter, and FIG. 15 (a) is a diagram showing a cross-sectional luminance distribution along the line BB in FIG. 15 (a), and FIG. 15 (c) shows one of the two when the end region of the joining member between the two display panels contracts. It is a figure which shows the simulation result of the change of the thickness in the short axis direction of the liquid crystal cell of a display panel.

(Background of Obtaining One Embodiment of the Present Disclosure)
Hereinafter, prior to the description of the embodiments of the present disclosure, the background of obtaining one aspect of the present disclosure will be described.

  When a liquid crystal display device having two display panels joined by a joining member made of a photocurable resin is used for a long time, a frame-shaped luminance unevenness may occur in the peripheral portion of the display screen when energized. For example, when such a liquid crystal display device 1X is used for 2000 hours, as shown by the dotted hatching in FIG. 13, there is a frame-shaped luminance unevenness in the peripheral portion of the display screen (effective area) of the liquid crystal display device 1X. May occur. As described above, when the frame-shaped luminance unevenness occurs in the liquid crystal display device 1X, the quality of the displayed image deteriorates. Note that, in FIG. 13, the frame-shaped black-painted portion is an invalid area in which the black matrix is formed.

  When the inventors of the present application have examined the cause of the occurrence of the frame-shaped luminance unevenness, the inventors of the present application, as shown in FIG. When the liquid crystal display device 1X having the two display panels 200 is used for a long time, the joining member 500X between the first display panel 100 and the second display panel 200 contracts in a region other than the peripheral edge, so that the first display panel 100 has. A tensile stress toward the center is generated between the first TFT substrate 111 of the first liquid crystal cell 110 and the second TFT substrate 211 of the second liquid crystal cell 210 included in the second display panel 200. This tensile stress causes the first TFT substrate 111 of the first display panel 100 and the second TFT substrate 211 of the second display panel 200 to be distorted, and the first TFT substrate 111 and the second display panel 200 in the end regions of the first and second display panels 100 and 200, respectively, are distorted. It was estimated that frame-shaped luminance unevenness might occur due to variations in the thickness (cell thickness) of the liquid crystal cell 110 and the second liquid crystal cell 210. That is, it was estimated that the occurrence of the frame-shaped luminance unevenness might be caused by the variation in the thickness of the end region of the liquid crystal cell of the display panel in the liquid crystal display device. Note that the polarizing plate is omitted in FIG. 14, and each of the first liquid crystal cell 110 and the second liquid crystal cell 210 is sandwiched by a pair of polarizing plates.

  Based on this estimation, the inventors of the present application measured the luminance of the liquid crystal display device in which the frame-shaped luminance unevenness actually occurred, and performed a simulation regarding the variation in the thickness of the liquid crystal cell. The result is shown in FIG.

  FIG. 15A is a diagram showing a two-dimensional luminance distribution when a liquid crystal display device in which a frame-shaped luminance unevenness actually occurs is measured by a two-dimensional luminance meter, and FIG. It is a figure which shows the cross-section luminance distribution in the BB line (short axis direction) of 15 (a). FIG. 15C shows a change in thickness in the short axis direction of the liquid crystal cell of one display panel (cell thickness when the end area of the joining member (OCA) between the two display panels contracts. It is a figure which shows the simulation result of (distribution).

  As can be seen by comparing (b) of FIG. 15 and (c) of FIG. 15, it was found that the luminance distribution and the cell thickness distribution are substantially the same. That is, it is considered that the frame-shaped uneven brightness occurs as a result of the contraction of the end region of the joining member between the two display panels and the variation in the thickness of the liquid crystal cell of the display panel.

  Based on these results, the inventors of the present application further examined the cause of contraction of the end region of the joining member. Specifically, the inventors of the present application focused on that the resin material forming the joining member is a photocurable resin, and the cause of the shrinkage of the end region of the joining member is not the photocurable resin. I thought about it and thought hard.

  As a result, it was found that the shrinkage of the end region of the joining member is due to the distribution of the curing reaction rate of the photocurable resin. The examination results will be described below.

  A photoinitiator is contained in the photocurable resin that constitutes the joining member for bonding the two display panels together. The polymerization initiator is excited (activated) when irradiated with light to cause a cleavage reaction or the like to generate a substance such as a radical for starting a curing reaction. By exposing and curing the photocurable resin, a film-like joining member for bonding the two display panels together is produced.

  At this time, the curing reaction rate of the photocurable resin forming the joining member has not reached 100%, and it is considered that the polymerization initiator remains in the photocuring resin forming the joining member. Therefore, when a liquid crystal display device having two display panels bonded by a joining member made of a photocurable resin is used for a long time, the polymerization initiator remaining in the photocurable resin forming the joining member is not used. The light from the backlight reacts afterwards, causing additional curing (additional reaction) of the photocurable resin. The additional curing (post-curing) of the photocurable resin is caused by the light from the backlight even if the photocurable resin is an ultraviolet curable resin.

  At this time, the radical generation amount of the polymerization initiator due to the irradiation of the light of the backlight is the amount of the polymerization initiator remaining in the photocurable resin forming the bonding member and the irradiation light amount of the light of the backlight (integrated light amount). And depends on.

  Therefore, if the amount of the polymerization initiator remaining in the photocurable resin is small, or if the liquid crystal display device is used for a short time and the irradiation light amount of the backlight is small, the radical generation amount of the polymerization initiator is small. Become. On the contrary, if the amount of the polymerization initiator remaining in the photocurable resin is large, or if the liquid crystal display device is used for a long time and the amount of light emitted from the backlight is large, the amount of radicals generated by the polymerization initiator is increased. Will increase.

  On the other hand, in a liquid crystal display device having two display panels attached by a joining member, the edge (side end surface) of the joining member is exposed to air. Therefore, oxygen contained in the air enters from the edge of the joining member. In this case, the oxygen concentration in the end region of the joining member is higher than that in the central region of the joining member due to oxygen that has entered from the edge of the joining member. Oxygen inhibits the excitation of the polymerization initiator contained in the photocurable resin. Therefore, in the joining member constituted by the photocurable resin, the above-mentioned additional curing of the photocurable resin due to the light of the backlight is suppressed particularly in the end region of the bonding sheet by the polymerization inhibition by the oxygen. ..

  As described above, one of the causes of the frame-shaped uneven brightness when the liquid crystal display device having the two display panels bonded by the bonding member is used for a long time is one of the photo-curable resins forming the bonding member. While the polymerization initiator remaining in the composition was additionally cured by the light of the backlight, the additional curing of the photocurable resin was suppressed in the end regions of the bonding member than in the central region of the bonding member due to polymerization inhibition by oxygen. It is thought to be in.

  The inventors of the present application have made earnest studies based on this finding, and as a result, reduced the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member for joining the two display panels. By doing so, the idea that the deterioration of the quality of the displayed image due to the frame-shaped luminance unevenness can be suppressed was obtained.

  The present disclosure has been made based on such a new idea, and provides a method for manufacturing a liquid crystal display device and a liquid crystal display device capable of suppressing deterioration in the quality of a display image due to a frame-shaped luminance unevenness.

  Hereinafter, embodiments of the present disclosure will be described. It should be noted that each of the embodiments described below shows a specific example of the present disclosure. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, steps, order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present disclosure. Absent. Therefore, among the constituent elements in the following embodiments, the constituent elements that are not described in the independent claims indicating the highest concept of the present disclosure will be described as arbitrary constituent elements.

  Each drawing is a schematic diagram, and is not necessarily an exact illustration. Therefore, the scales and the like do not necessarily match in each drawing. In each drawing, the substantially same components are designated by the same reference numerals, and overlapping description will be omitted or simplified.

  Further, in the present specification and the drawings, the X axis, the Y axis, and the Z axis represent the three axes of the three-dimensional orthogonal coordinate system.

(Embodiment 1)
First, the configuration of the liquid crystal display device 1 according to the first embodiment will be described with reference to FIG. FIG. 1 is a diagram showing a schematic configuration of the liquid crystal display device 1 according to the first embodiment.

  The liquid crystal display device 1 is an example of an image display device configured by stacking a plurality of display panels including liquid crystal cells, and displays a still image or a moving image (video).

  As shown in FIG. 1, the liquid crystal display device 1 according to the present embodiment includes, as a plurality of display panels, a first display panel 100 arranged at a position (front side) close to an observer and an observation from the first display panel 100. The second display panel 200 arranged at a position (rear side) far from the person.

  Further, the liquid crystal display device 1 includes a backlight 300 arranged on the rear side of the first display panel 100 and the second display panel 200. Specifically, the backlight 300 is arranged on the rear side of the second display panel 200.

  The first display panel 100 is a main panel and displays an image visually recognized by the user. In the present embodiment, first display panel 100 displays a color image. The first display panel 100 is provided with a first source driver 102 and a first gate driver 103 for displaying a color image according to an input video signal in a first image display area 101 (active area).

  Specifically, in the liquid crystal cell of the first display panel 100, a first source FPC (Flexible Printed Circuits) 104 in which a first source driver 102 is mounted and a first gate FPC 105 in which a first gate driver 103 is mounted. And are connected.

  A first circuit board 106 is connected to a portion of the first source FPC 104 opposite to the first display panel 100 side. The first circuit board 106 is a printed circuit board (PCB) having a substantially rectangular plate shape, and a plurality of electronic components are mounted on the first circuit board 106. The first circuit board 106 has a function of transmitting various signals output from the first timing controller 410 to the first source driver 102 mounted on the first source FPC 104.

  When displaying a color image in the first image display area 101 of the first display panel 100, various signals output from the first timing controller 410 are input to the first source driver 102 and the first gate driver 103.

  The second display panel 200 is a sub-panel arranged on the back side of the first display panel 100. In the present embodiment, second display panel 200 displays a monochrome image (black and white image) of an image corresponding to the color image displayed on first display panel 100, in synchronization with the color image. The second display panel 200 is provided with a second source driver 202 and a second gate driver 203 for displaying a monochrome image according to an input video signal in the second image display area 201.

  Specifically, the liquid crystal cell of the second display panel 200 is connected to the second source FPC 204 in which the second source driver 202 is mounted and the second gate FPC 205 in which the second gate driver 203 is mounted. ..

  A second circuit board 206 is connected to a portion of the second source FPC 204 opposite to the second display panel 200 side. The second circuit board 206 is a substantially rectangular printed board (PCB), and a plurality of electronic components are mounted on the second circuit board 206. The second circuit board 206 has a function of transmitting various signals output from the second timing controller 420 to the second source driver 202 mounted on the second source FPC 204.

  When displaying a monochrome image in the second image display area 201 of the second display panel 200, various signals output from the second timing controller 420 are input to the second source driver 202 and the second gate driver 203.

  The first image display area 101 and the second image display area 201 are areas corresponding to a display screen on which an image is displayed, and have a plurality of pixels arranged in a matrix. The number of pixels of the first image display area 101 and the number of pixels of the second image display area 201 may be the same or different.

  The driving method of the first display panel 100 and the second display panel 200 is, for example, an in-plane switching method such as an IPS (In Plane Switching) method or a FFS (Fringe Field Switching) method, but is not limited thereto. A VA (Vertical Alignment) method or a TN (Twisted Nematic) method may be used.

  The backlight 300 is a light source unit arranged on the back side of the first display panel 100 and the second display panel 200, and emits light toward the first display panel 100 and the second display panel 200. In the present embodiment, the backlight 300 is a surface light source unit that uniformly radiates planar, uniform diffused light (scattered light).

  The backlight 300 is, for example, an LED backlight having an LED (Light Emitting Diode) as a light source, but is not limited to this. Further, in the present embodiment, the backlight 300 is a direct type, but may be an edge type. The specific configuration of the backlight 300 will be described later.

  The liquid crystal display device 1 further includes an image processing unit 430 that outputs image data to the first timing controller 410 and the second timing controller 420.

  The image processing unit 430 receives the input video signal Data transmitted from an external system (not shown), performs image processing, and then outputs the first image data DAT1 to the first timing controller 410 to output the second image data DAT1. The second image data DAT2 is output to the timing controller 420. The image processing unit 430 also outputs a control signal (omitted in FIG. 1) such as a synchronization signal to the first timing controller 410 and the second timing controller 420. The first image data DAT1 is image data for color display, and the second image data DAT2 is image data for monochrome display.

  As described above, in the liquid crystal display device 1 according to the present embodiment, the two display panels of the first display panel 100 and the second display panel 200 are overlapped to display an image, so that black can be tightened. .. Thereby, an image with a high contrast ratio can be displayed.

  Next, detailed structures of the first display panel 100 and the second display panel 200 will be described with reference to FIG. FIG. 2 is a cross-sectional view showing the configuration of the liquid crystal display device 1 according to the first embodiment.

  As shown in FIG. 2, the liquid crystal display device 1 includes a first display panel 100, a second display panel 200, and a backlight 300, and also joins the first display panel 100 and the second display panel 200 together. The member 500 is provided.

  The first display panel 100 and the second display panel 200 joined by the joining member 500 form the liquid crystal module 2. That is, the liquid crystal display device 1 includes the liquid crystal module 2 and the backlight 300. In the present embodiment, the backlight 300 is arranged on the second display panel 200 side of the liquid crystal module 2. Therefore, the backlight 300 emits light toward the second display panel 200 of the liquid crystal module 2.

  The first display panel 100 includes a first liquid crystal cell 110 and a pair of first polarizing plates 120 that sandwich the first liquid crystal cell 110.

  The first liquid crystal cell 110 includes a first TFT (Thin Film Transistor) substrate 111, a first counter substrate 112 facing the first TFT substrate 111, and a first TFT disposed between the first TFT substrate 111 and the first counter substrate 112. And a liquid crystal layer 113. In the present embodiment, the first liquid crystal cell 110 is arranged such that the first counter substrate 112 is located in front of the first TFT substrate 111, but the first TFT substrate 111 is located in front of the first counter substrate 112. It may be arranged so as to be located at.

  The first TFT substrate 111 is a substrate in which a TFT layer (not shown) is formed on a transparent substrate such as a glass substrate. In the TFT layer, TFTs provided corresponding to each of the pixels arranged in a matrix and wirings for driving the TFTs are formed. A pixel electrode for applying a voltage to the first liquid crystal layer 113 is formed on the flattening layer of the TFT layer.

  The first counter substrate 112 is a CF substrate in which a color filter layer is formed as a pixel forming layer on a transparent substrate such as a glass substrate. The pixel formation layer of the first counter substrate 112 has a black matrix (black portion) and a color filter (colored portion). The black matrix is formed in, for example, a lattice shape or a stripe shape, and the black matrix is formed with a plurality of matrix-shaped openings forming pixels. A color filter is formed in each opening of the black matrix. That is, the black matrix surrounds the color filter. Each color filter is, for example, a red color filter, a green color filter, or a blue color filter. The color filter of each color corresponds to each pixel. An overcoat layer is formed so as to cover the pixel formation layer. Further, an alignment film is formed on the surface of the overcoat layer.

  The first liquid crystal layer 113 is sealed between the first TFT substrate 111 and the first counter substrate 112. Specifically, the first liquid crystal layer 113 is sealed between the alignment film formed on the first TFT substrate 111 and the alignment film formed on the first counter substrate 112. The liquid crystal material of the first liquid crystal layer 113 can be appropriately selected according to the driving method. The thickness (cell gap) of the first liquid crystal layer 113 is, for example, 2.5 μm to 6 μm, but is not limited to this.

  The pair of first polarizing plates 120 includes a bonding-side first polarizing plate 121 attached to the bonding member 500 side (second liquid crystal cell 210 side) surface of the first liquid crystal cell 110 and the first liquid crystal cell 110. The first polarizing plate 122 on the non-bonding side is attached to the surface opposite to the bonding member 500 side.

  Specifically, the first polarizing plate 121 on the bonding side is bonded to the surface of the first TFT substrate 111 of the first liquid crystal cell 110 and bonded to the bonding member 500. On the other hand, the first polarizing plate 122 on the non-bonding side is attached to the surface of the first counter substrate 112 of the first liquid crystal cell 110.

  The pair of first polarizing plates 120 (the first polarizing plate 121 on the bonding side and the first polarizing plate 122 on the non-bonding side) are arranged so that the polarization directions thereof are orthogonal to each other. That is, the pair of first polarizing plates 120 are arranged in crossed Nicols.

  Each of the pair of first polarizing plates 120 is, for example, a sheet-shaped polarizing film made of a resin material. In the present embodiment, the first polarizing plate 121 on the bonding side of the pair of first polarizing plates 120 that is bonded to the bonding member 500 is the polarizer 121a and the light disposed on the bonding member 500 side of the polarizer 121a. And a diffusion adhesive layer 121b. Each of the polarizer 121a and the light diffusion adhesive layer 121b is supported by, for example, a transparent resin film such as a TAC (Triacetyl cellulose) film. On the other hand, of the pair of first polarizing plates 120, the first polarizing plate 122 on the non-bonding side that is not bonded to the bonding member 500 has a polarizer, TAC, and the like, like the first polarizing plate 121 on the bonding side. However, it does not have a light diffusion adhesive layer.

  In addition, each of the pair of first polarizing plates 120 may include a transparent protective film as an outermost layer. Further, one of the pair of first polarizing plates 120 may include a retardation plate (retardation film).

  The second display panel 200 has a second liquid crystal cell 210 and a pair of second polarizing plates 220 that sandwich the second liquid crystal cell 210.

  The second liquid crystal cell 210 includes a second TFT substrate 211, a second counter substrate 212 facing the second TFT substrate 211, and a second liquid crystal layer 213 arranged between the second TFT substrate 211 and the second counter substrate 212. Prepare In the present embodiment, the second liquid crystal cell 210 is arranged such that the second TFT substrate 211 is located in front of the second counter substrate 212, but the second counter substrate 212 is located in front of the second TFT substrate 211. It may be arranged so as to be located at.

  The second TFT substrate 211 has the same configuration as the first TFT substrate 111, and is a substrate in which a TFT layer (not shown) is formed on a transparent substrate such as a glass substrate.

  The second counter substrate 212 is a substrate in which a pixel formation layer is formed on a transparent substrate such as a glass substrate. The pixel formation layer of the second counter substrate 212 has a black matrix in which a plurality of matrix-shaped openings that form pixels are formed. An overcoat layer is formed so as to cover the pixel formation layer of the second counter substrate 212. Further, an alignment film is formed on the surface of the overcoat layer. Further, in the present embodiment, since the second display panel 200 displays a monochrome image, no color filter is formed in the pixel forming layer of the second counter substrate 212. Therefore, the overcoat layer is filled in the openings of the black matrix of the pixel forming layer of the second counter substrate 212.

  The second liquid crystal layer 213 is sealed between the second TFT substrate 211 and the second counter substrate 212. Specifically, the second liquid crystal layer 213 is sealed between the alignment film formed on the second TFT substrate 211 and the alignment film formed on the second counter substrate 212. The liquid crystal material of the second liquid crystal layer 213 can be appropriately selected according to the driving method. The thickness (cell gap) of the second liquid crystal layer 213 is 2.5 μm to 6 μm, like the first liquid crystal layer 113, but is not limited to this.

  The pair of second polarizing plates 220 sandwiching the second liquid crystal cell 210 has the same configuration as the first polarizing plate 120, and is attached to the surface of the second liquid crystal cell 210 on the side of the bonding member 500 (the side of the first liquid crystal cell 110). The second polarizing plate 221 on the joining side is attached, and the second polarizing plate 222 on the non-joining side is attached to the surface of the second liquid crystal cell 210 opposite to the joining member 500 side.

  Specifically, the second polarizing plate 221 on the bonding side is bonded to the surface of the second TFT substrate 211 of the second liquid crystal cell 210 and bonded to the bonding member 500. On the other hand, the second polarizing plate 222 on the non-bonding side is attached to the surface of the second counter substrate 212 of the second liquid crystal cell 210.

  The pair of second polarizing plates 220 (the second polarizing plate 221 on the bonding side and the second polarizing plate 222 on the non-bonding side) are arranged so that the polarization directions thereof are orthogonal to each other. That is, the pair of second polarizing plates 220 are arranged in crossed Nicols.

  Each of the pair of second polarizing plates 220 is a sheet-shaped polarizing film made of, for example, a resin material. In the present embodiment, of the pair of second polarizing plates 220, the second polarizing plate 221 on the bonding side that is bonded to the bonding member 500 is the polarizer 221a and the light disposed on the bonding member 500 side of the polarizer 221a. And a diffusion adhesive layer 221b. Each of the polarizer 221a and the light diffusion adhesive layer 221b is supported by, for example, a transparent resin film such as a TAC film. On the other hand, of the pair of second polarizing plates 220, the non-bonding side second polarizing plate 222 that is not bonded to the bonding member 500 has a polarizer, TAC, and the like, like the bonding side second polarizing plate 221. However, it does not have a light diffusion adhesive layer.

  In addition, each of the pair of second polarizing plates 220 may include a transparent protective film as an outermost layer. Further, one of the pair of second polarizing plates 220 may include a retardation plate (retardation film).

  The joining member 500 joins the first display panel 100 and the second display panel 200. Specifically, the joining member 500 joins the first polarizing plate 121 on the joining side of the first display panel 100 and the second polarizing plate 221 on the joining side of the second display panel 200. In the present embodiment, the bonding member 500 is in contact with the light diffusion adhesive layer 121b of the first polarizing plate 121 on the bonding side and the light diffusion adhesive layer 221b of the second polarizing plate 221 on the bonding side.

  The joining member 500 functions as an adhesive layer for bonding the first display panel 100 and the second display panel 200 together. Specifically, the joining member 500 is a film-like joining sheet (laminating sheet) made of an optically transparent adhesive sheet (OCA).

  The joining member 500 is made of, for example, a photocurable resin such as an ultraviolet curable resin. Examples of the photocurable resin include acryl-based, silicone-based, urethane-based, polyester-based, and epoxy-based compounds. In the present embodiment, the joining member 500 is made of an acrylic ultraviolet curable resin. The “photocurable resin” means a resin composition that can be cured by exposure. Further, “exposure” means irradiation with light such as ultraviolet rays.

  The joining member 500 is obtained by inserting a sheet-shaped photocurable resin composition obtained by solidifying in advance between the first display panel 100 and the second display panel 200 and exposing it to cure. The liquid photocurable resin composition may be applied onto one of the first display panel 100 and the second display panel 200, and then the first display panel 100 and the second display panel 200 may be coated with the liquid photocurable resin composition. It may be cured by stacking the other and exposing it.

  Since the photocurable resin does not need to be heated to remove the solvent, the photocurable resin is preferably a solventless type. The term “solvent-free type” means that no solvent is contained or the content ratio of the solvent is 5% by weight or less based on the total weight (100% by weight) of the curable resin. Further, the “solvent” means a liquid (volatile diluent) having a boiling point of 150 ° C. or lower. Since the drying step can be omitted by using the photocurable resin containing no solvent, it is preferable that the photocurable resin does not contain a solvent.

  Further, the photocurable resin cures at a lower temperature and has a faster curing rate than the thermosetting resin. Therefore, by using the photocurable resin, the first display panel 100 and the second display panel 200 can be attached to each other at a low temperature and in a short time.

  A curable resin such as a photocurable resin typically contains a curable compound having a curable group and a polymerization initiator (reaction initiator). Further, the curable resin may contain a compound other than the polymerization initiator, if necessary. Examples of other compounds include additives such as plasticizers or stabilizers and chain transfer agents.

  The first display panel 100 and the second display panel 200 (liquid crystal module 2) joined by the joining member 500 are held together with the backlight 300 by a holding member such as a frame.

  Next, a method of manufacturing the liquid crystal display device 1 according to the first embodiment will be described with reference to FIGS. 3A and 3B. FIG. 3A is a diagram for explaining a joining process in the manufacturing method for the liquid crystal display device 1 according to the first embodiment, and FIG. 3B is a diagram for explaining an aging process in the manufacturing method.

  In the method for manufacturing the liquid crystal display device 1 according to the present embodiment, first, as shown in FIG. 3A, the liquid crystal module 2 is manufactured by joining the first display panel 100 and the second display panel 200 with the joining member 500. Do (joining process).

  For example, the second display panel 200 is prepared, the joining member 500 is attached on the second display panel 200, and then the first display panel 100 is attached on the joining member 500. Thereby, the liquid crystal module 2 in which the first display panel 100 and the second display panel 200 are bonded together by the bonding member 500 can be manufactured. The joining member 500 may be first attached to the first display panel 100, and then the second display panel 200 may be attached to the joining member 500.

  After the liquid crystal module 2 is produced, as shown in FIG. 3B, the liquid crystal module 2 is irradiated with visible light for aging (aging step). In the present embodiment, as shown in FIG. 3B, visible light is emitted using the backlight 300 included in the liquid crystal display device 1. Specifically, under a temperature environment of 30 ° C. to 50 ° C. (for example, a constant temperature environment of 45 ° C.) for about 3 to 20 days (eg, about 14 days), the light of the backlight 300 is applied to the liquid crystal module 2. Irradiate continuously.

  In this way, by irradiating the liquid crystal module 2 with visible light and performing aging, it is possible to positively promote the additional curing of the polymerization initiator remaining in the bonding member 500. This makes it possible to increase the curing reaction rate of the photocurable resin in the entire area of the joining member 500 and reduce the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500. be able to. Therefore, it is possible to suppress the occurrence of frame-shaped luminance unevenness on the display screen of the liquid crystal display device 1, and thus it is possible to suppress deterioration of the quality of the display image of the liquid crystal display device 1.

  In addition, in the aging step, the liquid crystal module 2 may be aged in an environment in which oxygen is less than atmospheric air. Examples of the environment with a small amount of oxygen include a nitrogen atmosphere or a reduced pressure atmosphere.

  As described above, by aging the liquid crystal module 2 in an environment in which oxygen is less than the atmosphere, oxygen is prevented from entering the inside of the joining member 500 from the edge (side end surface) of the joining member 500 during aging. It can be prevented. As a result, in the process in which the polymerization initiator remaining in the joining member 500 is additionally hardened in the aging step, after the oxygen existing in the joining member 500 before aging is consumed by the additional hardening, Since new oxygen does not invade, it is possible to suppress the inhibition of polymerization of the polymerization initiator by new oxygen. As a result, the polymerization initiator remaining in the end region of the joining member 500 can be efficiently post-cured, so that the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 is reduced. It can be made smaller. Therefore, it is possible to further suppress the occurrence of frame-shaped luminance unevenness.

  Here, a specific example of the aging step will be described with reference to FIG. FIG. 4 is a diagram schematically showing a specific example of the aging step in the method of manufacturing the liquid crystal display device 1 according to the first embodiment. Note that, in FIG. 4, the first display panel 100, the joining member 500, and the second display panel 200 are illustrated as separated for convenience of description, but actually, they are attached to each other as shown in FIG. 3B. ing. Further, in FIG. 4, the first image display area 101 is hatched for convenience, in order to show that the first display panel 100 is in the black display state.

  As shown in FIG. 4, when aging the liquid crystal module 2, visible light is emitted using the backlight 300 included in the liquid crystal display device 1. In the liquid crystal display device 1 according to the present embodiment, the liquid crystal module 2 is arranged so that the second display panel 200 of the first display panel 100 and the second display panel 200 is located on the side of the backlight 300. White light of the backlight 300 is emitted from the second display panel 200 side of the module 2. Specifically, the backlight 300 is fully illuminated and the liquid crystal module 2 is irradiated with white light emitted from the backlight 300. In this way, by using the backlight 300, the liquid crystal module 2 can be aged without using another light source such as a lighting device.

  In addition, in the present embodiment, the second display panel 200 includes the second liquid crystal cell 210 and the second polarizing plate 220 provided on the surface of the second liquid crystal cell 210 on the bonding member 500 side, In the aging process of the liquid crystal module 2, the second display panel 200 is controlled so that the peripheral area and the central area of the second image display area 201 of the second display panel 200 have approximately the same transmittance. Specifically, the second liquid crystal cell 210 is driven so that the peripheral areas and the central area of the second image display area 201 of the second display panel 200 have similar pixel gradations. For example, the gradation of pixels in the entire second image display area 201 of the second display panel 200 is the same, and the transmittance of the entire second image display area 201 is the same. In the present embodiment, by driving the second liquid crystal cell 210 of the second display panel 200, the gradation of the pixels in the entire second image display area 201 is increased, and the second image display of the second display panel 200 is performed. A white image is displayed on the entire area 201. That is, the second display panel 200 displays a white image.

  Accordingly, when the liquid crystal module 2 is aged, the light emitted from the backlight 300 arranged on the second display panel 200 side of the liquid crystal module 2 is entirely in the second image display area 201 of the second display panel 200. The light of the backlight 300 irradiates the entire surface of the bonding member 500 on the second display panel 200 side. Therefore, since the reaction of the additional curing of the polymerization initiator remaining in the joining member 500 is efficiently performed over the entire joining member 500, the curing reaction rate of the photocurable resin in the end region and the central region of the joining member 500. Can be further reduced. As a result, it is possible to further suppress the occurrence of frame-shaped luminance unevenness on the display screen of the liquid crystal display device 1.

  In addition, in the present embodiment, when the liquid crystal module 2 is aged, the first display panel 100 is in the black display state. Specifically, the first display panel 100 displays a black image. For example, by driving the first liquid crystal cell 110 of the first display panel 100, a black image is displayed on the entire first image display area 101 of the first display panel 100.

  By displaying a white image on the second display panel 200 as described above, the light of the backlight 300 is transmitted through the second display panel 200 and the joining member 500, but a black image is displayed on the first display panel 100. By doing so, the light of the backlight 300 does not pass through the first display panel 100. Thereby, the light of the backlight 300 transmitted through the second display panel 200 can be efficiently incident on the joining member 500 between the first display panel 100 and the second display panel 200. Therefore, the additional curing reaction of the polymerization initiator remaining in the joining member 500 is performed more efficiently, and the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 is further reduced. be able to. As a result, it is possible to further suppress the occurrence of frame-shaped luminance unevenness on the display screen of the liquid crystal display device 1.

(Modification 1 of Embodiment 1)
Next, a first modification of the first embodiment will be described with reference to FIG. FIG. 5 is a diagram schematically showing a specific example of the aging step in the method for manufacturing the liquid crystal display device according to the first modification of the first embodiment.

  Note that, also in FIG. 5, as in FIG. 4, the first display panel 100, the joining member 500, and the second display panel 200 are illustrated separately for convenience of description. Also in FIG. 5, the first image display area 101 is hatched for the sake of convenience to show that the first display panel 100 is in the black display state.

  As shown in FIG. 5, in the present modification as well, in the aging process of the liquid crystal module 2, the light of the backlight 300 is applied to the liquid crystal module 2, but in the present modification, the end region of the joining member 500 is exposed. Is irradiated with the light of the backlight 300 with an intensity higher than that of the central region of the joining member 500.

  Specifically, in the first embodiment, the second display panel 200 is controlled so that the peripheral area and the central area of the second image display area 201 of the second display panel 200 have approximately the same transmittance. Although the liquid crystal module 2 is aged, in this modification, the transmittance of the peripheral area of the second image display area 201 of the second display panel 200 is set to the central area of the second image display area 201 of the second display panel 200. The liquid crystal module 2 is aged by making it higher than the transmittance. Specifically, the gradation of the pixels in the peripheral area of the second image display area 201 of the second display panel 200 is made higher than the gradation of the pixels in the central area of the second image display area 201 of the second display panel 200. The transmittance of the peripheral area of the second image display area 201 is made higher than the transmittance of the central area of the second image display area 201.

  In this case, the gradation of the pixels in the peripheral area of the second image display area 201 is preferably 1.5 times or more higher than the gradation of the pixels in the central area of the second image display area 201. Thereby, the light intensity of the visible light with which the end region of the joining member 500 is irradiated can be made 1.5 times or more stronger than the light intensity of the visible light with which the central region of the joining member 500 is irradiated.

  As described above, in the second display panel 200, the transmittance of the peripheral area of the second image display area 201 is made higher than the transmittance of the central area of the second image display area 201, so that the second display panel 200 is transparent. The intensity of the light of the backlight 300 with which the joining member 500 is irradiated is higher in the end region of the joining member 500 than in the central region of the joining member 500.

  In this modification, the peripheral area (area having higher transmittance than the central area) of the second image display area 201 of the second display panel 200 is, as shown in FIG. The outer area A1 is a rectangular frame-shaped peripheral area in the two-image display area 201. Further, in the second image display area 201, the area other than the outer area A1 is the inner area A2 which is an area inner than the outer area A1. The central area of the second image display area 201 is the central area of the second image display area 201 and the peripheral area thereof. Specifically, the central region of the second image display region 201 is the central region of the inner region A2 and its peripheral region.

  As an example, when the length of the long side of the second display panel 200 is L1 and the length of the short side of the second display panel 200 is L2, a rectangular frame shape in the second image display area 201 of the second display panel 200 is formed. The outer region A1 (that is, the peripheral region of the second image display region 201 of the second display panel 200) on the short side of the second display panel 200 is the edge of the short side as a reference. The second display panel 200 is located in a region between the position of L1 × 2% along the long axis direction and the position of L1 × 20% along the long axis direction with reference to the edge of the short side. On the long side, the position of L2 × 3% along the short axis direction of the second display panel 200 based on the edge of the long side and L2 along the short axis direction based on the edge of the long side. It is located in the region between the position of x30%.

  In this case, in this modified example, as shown in FIG. 5, the gradation of the pixels in the outer area A1 of the second display panel 200 is set to be about twice higher than the gradation of the pixels in the inner area A2 of the second display panel 200. There is. As a result, the transmittance of the outer area A1 of the second display panel 200 can be made about twice higher than the transmittance of the inner area A2 of the second display panel 200. As a result, the light of the backlight 300 emitted to the end region of the joining member 500 facing the outer region A1 of the second display panel 200 is inside the joining member 500 facing the inner region A2 of the second display panel 200. It is about twice as strong as the light of the backlight 300 with which the area is irradiated.

  In addition, in the aging step of the liquid crystal module 2, the central region of the joining member 500 may not be irradiated with the light of the backlight 300. Specifically, the area of the joining member 500 facing the inner area A2 of the second display panel 200 may not be irradiated with the light of the backlight 300. That is, the light of the backlight 300 may be emitted only to the end region of the joining member 500 facing the outer region A1 of the second display panel 200.

  In this case, for example, the second liquid crystal cell 210 of the second display panel 200 is driven to display white on the outer area A1 of the second display panel 200, and the area other than the outer area A1 of the second display panel 200 is displayed. Even if the transmittance of the peripheral area of the second image display area 201 in the second display panel 200 is made higher than the transmittance of the central area of the second image display area 201 by displaying black in the (inner area A2). Good. Accordingly, the light of the backlight 300 can be emitted only to the end region of the joining member 500.

  As described above, according to the method of manufacturing the liquid crystal display device of the present modification, as in the first embodiment, the additional curing of the polymerization initiator remaining in the joining member 500 can be actively promoted, and thus the joining member The curing reaction rate of the entire region of 500 can be increased, and the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be reduced. Therefore, it is possible to suppress the occurrence of frame-shaped luminance unevenness on the display screen of the liquid crystal display device.

  In particular, in the present modification, when the liquid crystal module 2 is aged, the transmittance of the peripheral area of the second image display area 201 in the second display panel 200 is higher than the transmittance of the central area of the second image display area 201. It's high.

  As a result, the intensity of the light of the backlight 300 transmitted through the second display panel 200 and applied to the joining member 500 is higher in the end region of the joining member 500 than in the central region of the joining member 500. As a result, the additional curing reaction of the polymerization initiator can be efficiently carried out in the end region of the joining member 500 where the polymerization inhibition of the polymerization initiator is likely to occur due to oxygen. Therefore, since the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be appropriately reduced, frame-shaped luminance unevenness may occur on the display screen of the liquid crystal display device. Can be further suppressed.

  In this modification, when the liquid crystal module 2 is aged, a black image is displayed on the first display panel 100 and the backlight 300 is fully illuminated.

(Modification 2 of Embodiment 1)
Next, a second modification of the first embodiment will be described with reference to FIG. FIG. 6 is a diagram schematically showing a specific example of the aging step in the method of manufacturing the liquid crystal display device according to the second modification of the first embodiment.

  Note that, also in FIG. 6, as in FIG. 4, the first display panel 100, the joining member 500, and the second display panel 200 are illustrated separately for convenience of description. Also in FIG. 6, the first image display area 101 is hatched for the sake of convenience in order to show that the first display panel 100 is in the black display state.

  In this modified example, as in the modified example 1, when the liquid crystal module 2 is aged, the backlight 300 included in the liquid crystal display device 1 is used to irradiate the liquid crystal module 2 with visible light. In this case, also in this modification, the light of the backlight 300 is irradiated to the end region of the joining member 500 with a higher intensity than that of the central region of the joining member 500, as in the case of the first modification.

  However, in the first modification, the second display panel 200 is controlled so that the transmittance of the peripheral area of the second image display area 201 of the second display panel 200 is lower than the transmittance of the central area of the second image display area 201. By increasing the height, the end region of the joining member 500 is irradiated with the light of the backlight 300 with a higher intensity than the central region of the joining member 500. However, in this modification, the LEDs of the backlight 300 are partially driven. By making the light emission intensity of the peripheral region of the backlight 300 higher than the light emission intensity of the central region of the backlight 300, the light of the backlight 300 is emitted to the end region of the joining member 500 with higher intensity than the central region of the joining member 500. Is being irradiated.

  In this case, the light emission intensity of the peripheral region of the backlight 300 is preferably 1.5 times or more stronger than the light emission intensity of the central region of the backlight 300. Thereby, the light intensity of the visible light with which the end region of the joining member 500 is irradiated can be made 1.5 times or more stronger than the light intensity of the visible light with which the central region of the joining member 500 is irradiated.

  In this way, by making the light emission intensity of the peripheral region of the backlight 300 higher than the light emission intensity of the central region of the backlight 300, the backlight 300 is transmitted through the second display panel 200 and irradiated to the joining member 500. The intensity of light is higher in the end region of the joining member 500 than in the central region of the joining member 500.

  In this modification, the peripheral area of the backlight 300 (the area where the emission intensity is higher than the central area) is an outer area that is a rectangular frame-shaped peripheral area of the backlight 300, as shown in FIG. It is B1. In addition, in the entire light emitting region of the backlight 300, the region other than the outer region B1 is the inner region B2 which is the region inner than the outer region B1. The central region of the backlight 300 is the central region of the backlight 300 and its peripheral region. Specifically, the central region of the backlight 300 is the central region of the inner region B2 and its peripheral region.

  Note that, also in this modification, in the aging step of the liquid crystal module 2, the central region of the joining member 500 may not be irradiated with the light of the backlight 300. Specifically, the area of the joining member 500 facing the inner area A2 of the second display panel 200 may not be irradiated with the light of the backlight 300. That is, the light of the backlight 300 may be emitted only to the end region of the joining member 500 facing the outer region A1 of the second display panel 200.

  In this case, for example, by partially driving the backlight 300, the LEDs in the outer region B1 of the backlight 300 (for example, only the outermost LED) are turned on, and the LEDs in the inner region B2 of the backlight 300 are turned off. The light of the backlight 300 can be applied only to the end region of the joining member 500.

  As described above, according to the method of manufacturing the liquid crystal display device of the present modification, as in the first embodiment, the additional curing of the polymerization initiator remaining in the joining member 500 can be actively promoted, and thus the joining member The curing reaction rate of the entire region of 500 can be increased, and the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be reduced. Therefore, it is possible to suppress the occurrence of frame-shaped luminance unevenness on the display screen of the liquid crystal display device.

  In particular, in this modification, when the liquid crystal module 2 is aged, the light emission intensity of the peripheral region of the backlight 300 is set higher than the light emission intensity of the central region of the backlight 300.

  As a result, similarly to the first modification, the intensity of the light of the backlight 300 transmitted through the second display panel 200 and applied to the joining member 500 is higher than that of the central region of the joining member 500 at the end portion of the joining member 500. The area is higher. As a result, the additional curing reaction of the polymerization initiator can be efficiently carried out in the end region of the joining member 500 where the polymerization inhibition of the polymerization initiator is likely to occur due to oxygen. Therefore, since the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be appropriately reduced, frame-shaped luminance unevenness may occur on the display screen of the liquid crystal display device. Can be further suppressed.

  In this modification, when the liquid crystal module 2 is aged, a black image is displayed on the first display panel 100 and a white image is displayed on the second display panel 200.

(Embodiment 2)
Next, the second embodiment will be described with reference to FIGS. 7A and 7B. 7A and 7B are diagrams schematically showing a specific example of the aging step in the method for manufacturing a liquid crystal display device according to the second embodiment, and FIG. 7A is a diagram showing a first aging step in the aging step. 7B has shown the 2nd aging process in the same aging process.

  7A and 7B, similarly to FIG. 4, the first display panel 100, the joining member 500, and the second display panel 200 are illustrated separately for convenience of description. In addition, also in FIGS. 7A and 7B, the first image display area 101 is hatched for the sake of convenience to show that the first display panel 100 is in the black display state.

  As shown in FIGS. 7A and 7B, also in the present embodiment, when the liquid crystal module 2 is aged, the backlight 300 included in the liquid crystal display device 1 is used in the same manner as in the first embodiment. 2 is irradiated with visible light.

  The difference between the present embodiment and the first embodiment is the step of aging the liquid crystal module 2. Specifically, in the first embodiment, the first display panel 100, the second display panel 200, and the backlight 300 remain in the same state while the liquid crystal module 2 is being aged. In the present embodiment, any one of the states of the second display panel 200 and the backlight 300 is changed during the aging of the liquid crystal module 2. That is, the aging process of the liquid crystal module 2 is performed in two stages of the first aging process and the second aging process. Specifically, the display mode of the second display panel 200 is changed during the aging.

  In the aging step in the present embodiment, first, as shown in FIG. 7A, as the first aging step, the transmittance of the peripheral area and the central area of the second image display area 201 of the second display panel 200 is made the same. The step of irradiating the liquid crystal module 2 with the light of the backlight 300 is performed.

  As an example, in the first aging step, the backlight 300 is fully illuminated, the first display panel 100 displays a black image, and the second display panel 200 displays a white image. The light of the backlight 300 is applied to the module 2. In this case, for example, under a temperature environment of 30 ° C. to 50 ° C. (for example, a constant temperature environment of 45 ° C.) for about 2 days to 10 days (eg, about 7 days), the light of the backlight 300 is transmitted to the liquid crystal module 2. Irradiate continuously. In the first aging step, the entire surface of the joining member 500 is irradiated with the light of the backlight 300. That is, the first aging step is a whole surface irradiation step in which the entire surface of the joining member 500 is irradiated with visible light.

  In the first aging step, the liquid crystal module 2 may be aged under an environment in which oxygen is less than that in the atmosphere (such as a nitrogen atmosphere or a reduced pressure atmosphere).

  Next, as shown in FIG. 7B, after the first aging step, as a second aging step, the transmittance of the peripheral area of the second image display area 201 in the second display panel 200 is changed to the second image display area 201. Then, a step of irradiating the liquid crystal module 2 with the light of the backlight 300 is performed by making the transmittance higher than the central region. The second aging step is continuously performed with the first aging step.

  As an example, in the second aging step, the backlight 300 is set to all lights, and the gradation of the pixels in the peripheral area of the second image display area 201 in the second display panel 200 is adjusted to the central area of the second image display area 201. By making it higher than the gradation of pixels, the transmittance of the peripheral area of the second image display area 201 in the second display panel 200 is made higher than the transmittance of the central area of the second image display area 201, and the liquid crystal module 2 is provided. The light of the backlight 300 is emitted. In this case, for example, under a temperature environment of 30 ° C. to 50 ° C. (for example, a constant temperature environment of 45 ° C.) for about 2 days to 10 days (eg, about 7 days), the light of the backlight 300 is transmitted to the liquid crystal module 2. Irradiate continuously. Also in the second aging step, the liquid crystal module 2 may be aged in an environment where oxygen is less than that in the atmosphere (such as a nitrogen atmosphere or a reduced pressure atmosphere).

  In this way, by making the transmittance of the peripheral area of the second image display area 201 in the second display panel 200 higher than the transmittance of the central area of the second image display area 201, the light is transmitted through the second display panel 200. The intensity of the light of the backlight 300 with which the joining member 500 is irradiated is higher in the end region of the joining member 500 than in the central region of the joining member 500.

  In the present embodiment, in the second image display area 201 of the second display panel 200, the gradation of the pixels in the outer area A1 is made higher than the gradation of the pixels in the inner area A2. In this case, the gradation of the pixels in the outer area A1 is preferably 1.5 times or more (for example, about twice) higher than the gradation of the pixels in the inner area A2.

  Note that, also in the present embodiment, the outer area A1 and the inner area A2 in the second image display area 201 of the second display panel 200 are the same as in the first modification of the first embodiment. Specifically, as shown in FIG. 7B, when the long side length of the second display panel 200 is L1 and the short side length of the second display panel 200 is L2, the second display panel 200 is The rectangular frame-shaped outer area A1 in the two-image display area 201 (that is, the peripheral area of the second image display area 201 of the second display panel 200) is an edge of the short side on the short side of the second display panel 200. Positioned in a region between the position of L1 × 2% along the long axis direction of the second display panel 200 and the position of L1 × 20% along the long axis direction with reference to the edge of the short side. On the long side of the second display panel 200, the L2 × 3% position and the edge of the long side are arranged along the minor axis direction of the second display panel 200 with the edge of the long side as a reference. It is located in the region between the position of L2 × 30% along the minor axis direction with respect to the reference.

  In the second aging step, white is displayed in the peripheral area of the second image display area 201 of the second display panel 200, and the area other than the peripheral area of the second image display area 201 of the second display panel 200 is displayed. By displaying black in the area, the transmittance of the peripheral area of the second image display area 201 in the second display panel 200 may be higher than the transmittance of the central area of the second image display area 201. That is, the area of the joining member 500 facing the area other than the peripheral area of the second image display area 201 of the second display panel 200 may not be irradiated with the light of the backlight 300. For example, white may be displayed in the outer area A1 of the second display panel 200 and black may be displayed in the inner area A2 of the second display panel 200. Accordingly, the area of the joining member 500 facing the inner area A2 of the second display panel 200 is not irradiated with the light of the backlight 300, and the end of the joining member 500 facing the outer area A1 of the second display panel 200. The light of the backlight 300 is applied only to the partial area. In this case, the second aging step is a partial irradiation step in which only the end region of the joining member 500 is partially irradiated with visible light.

  As described above, according to the method of manufacturing the liquid crystal display device of the present embodiment, as in the case of the above-described first embodiment, the additional curing of the polymerization initiator remaining in the joining member 500 can be positively promoted. The curing reaction rate of the entire area of the member 500 can be increased, and the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be reduced. Therefore, it is possible to suppress the occurrence of frame-shaped luminance unevenness on the display screen of the liquid crystal display device.

  Particularly, in the method for manufacturing the liquid crystal display device according to the present embodiment, the aging process is performed so that the light transmittance of the backlight 300 is made equal by setting the transmittance of the peripheral area and the central area of the second image display area 201 of the second display panel 200 to be the same. The first aging step of irradiating the liquid crystal module 2 and the transmittance of the end area of the second image display area 201 in the second display panel 200 are made higher than the transmittance of the central area of the second image display area 201. The second aging step of irradiating the liquid crystal module 2 with the light of the backlight 300 is performed in two stages.

  As a result, in the second aging step, the intensity of the light of the backlight 300 that is transmitted through the second display panel 200 and applied to the joining member 500 is higher than that of the central region of the joining member 500 in the end region. Will be higher. As a result, the additional curing reaction of the polymerization initiator can be efficiently carried out in the end region of the joining member 500 where the polymerization inhibition of the polymerization initiator is likely to occur due to oxygen. Therefore, since the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be appropriately reduced, frame-shaped luminance unevenness may occur on the display screen of the liquid crystal display device. Can be further suppressed.

  Although the second aging step is performed after the first aging step in the present embodiment, the present invention is not limited to this. Specifically, the transmittance of the peripheral area of the second image display area 201 in the second display panel 200 is made higher than the transmittance of the central area of the second image display area 201 so that the light of the backlight 300 is transmitted. The step of irradiating the liquid crystal module 2 is performed first, and thereafter, the liquid crystal module 2 is irradiated with the light of the backlight 300 with the same transmittance in the peripheral area and the central area of the second image display area 201 of the second display panel 200. You may perform a process.

(Modification of Embodiment 2)
Next, a modified example of the second embodiment will be described with reference to FIGS. 8A and 8B. 8A and 8B are diagrams schematically showing a specific example of the aging step in the method of manufacturing the liquid crystal display device according to the modification of the second embodiment. FIG. 8A shows the first aging step of the aging step, and FIG. 8B shows the second aging step of the aging step.

  8A and 8B, similarly to FIG. 4, the first display panel 100, the joining member 500, and the second display panel 200 are illustrated separately for convenience of description. In addition, also in FIGS. 8A and 8B, the first image display area 101 is hatched for the sake of convenience to show that the first display panel 100 is in the black display state.

  Also in this modification, when aging the liquid crystal module 2, the backlight 300 included in the liquid crystal display device 1 is used to irradiate the liquid crystal module 2 with visible light, as in the second embodiment. In this case, also in this modification, as in the second embodiment, the aging process is performed so that the transmittance of the peripheral area and the central area of the second image display area 201 in the second display panel 200 is the same. In the first aging step of irradiating the liquid crystal module 2 with light, the transmittance of the second image display area 201 in the second display panel 200 is made higher than the transmittance of the central area of the second image display area 201, and the backlight 300. The second aging step of irradiating the liquid crystal module 2 with the above light is performed in two steps.

  However, in the second embodiment, the display mode of the second display panel 200 is changed during aging, but in the present modification, the light emission mode of the backlight 300 is changed during aging.

  Specifically, as shown in FIG. 8A, first, as in the second embodiment, as the first aging step, the transmission of the peripheral area and the central area in the second image display area 201 of the second display panel 200 is performed. A step of irradiating the liquid crystal module 2 with the light of the backlight 300 is performed at the same rate. The first aging step in this modification is the same as the first aging step in the second embodiment.

  Next, as shown in FIG. 8B, as a second aging step, the LEDs of the backlight 300 are partially driven so that the emission intensity of the peripheral region of the backlight 300 is made higher than the emission intensity of the central region of the backlight 300. Then, the step of irradiating the liquid crystal module 2 with the light of the backlight 300 is performed.

  As an example, in the second aging step, a white image is displayed on the second display panel 200, and a black image is displayed on the first display panel 100, so that the light emission intensity in the peripheral area is higher than that in the central area. The light of the light 300 is applied to the liquid crystal module 2. In this case, for example, under a temperature environment of 30 ° C. to 50 ° C. (for example, a constant temperature environment of 45 ° C.) for about 2 days to 10 days (eg, about 7 days), the light of the backlight 300 is transmitted to the liquid crystal module 2. Irradiate continuously. In addition, in the second aging step, the liquid crystal module 2 may be aged under an environment in which oxygen is less than that in the atmosphere (such as a nitrogen atmosphere or a reduced pressure atmosphere).

  In this way, by making the light emission intensity of the peripheral region of the backlight 300 higher than the light emission intensity of the central region of the backlight 300, the backlight 300 is transmitted through the second display panel 200 and irradiated to the joining member 500. The intensity of light is higher in the end region of the joining member 500 than in the central region of the joining member 500.

  In this modification, as shown in FIG. 8B, the emission intensity of the outer region B1 of the backlight 300 is set higher than the emission intensity of the inner region B2 of the backlight 300. In this case, the light emission intensity of the outer region B1 of the backlight 300 is 1.5 times or more, preferably 2 times or more higher than the light emission intensity of the inner region B2 of the backlight 300.

  Also in this modification, the outer region B1 and the inner region B2 of the backlight 300 are the same as those of the second modification of the first embodiment. Specifically, as shown in FIG. 8B, the peripheral region of the backlight 300 (the region where the emission intensity is higher than the central region) is an outer region which is a rectangular frame-shaped peripheral region of the backlight 300. It is B1. In addition, in the entire light emitting region of the backlight 300, the region other than the outer region B1 is the inner region B2 which is the region inner than the outer region B1. The central region of the backlight 300 is the central region of the backlight 300 and its peripheral region. Specifically, the central region of the backlight 300 is the central region of the inner region B2 and its peripheral region.

  Further, in the second aging step, only the peripheral area of the backlight 300 is turned on and the areas other than the peripheral area of the backlight 300 are extinguished, so that the light emission intensity of the peripheral area of the backlight 300 is increased. It may be higher than the emission intensity of the central region of 300. That is, the central region of the joining member 500 may not be irradiated with the light of the backlight 300, and only the end region of the joining member 500 may be irradiated with the light of the backlight 300. In this case, the second aging step is a partial irradiation step in which only the end region of the joining member 500 is partially irradiated with visible light.

  As described above, according to the method of manufacturing the liquid crystal display device of the present modification, as in the first embodiment, the additional curing of the polymerization initiator remaining in the joining member 500 can be actively promoted, and thus the joining member The curing reaction rate of the entire region of 500 can be increased, and the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be reduced. Therefore, it is possible to suppress the occurrence of frame-shaped luminance unevenness on the display screen of the liquid crystal display device.

  In particular, in the present modification, the aging process includes a first aging process in which the backlight 300 is fully illuminated and the light of the backlight 300 is applied to the liquid crystal module 2, and the light emission intensity in the peripheral region of the backlight 300 is set to the backlight. This is performed in two steps, that is, a second aging step in which the liquid crystal module 2 is irradiated with the light of the backlight 300 by increasing the light emission intensity in the central region of 300.

  As a result, in the second aging step, the intensity of the light of the backlight 300 that is transmitted through the second display panel 200 and applied to the joining member 500 is higher than that of the central region of the joining member 500 in the end region. Will be higher. As a result, the additional curing reaction of the polymerization initiator can be efficiently carried out in the end region of the joining member 500 where the polymerization inhibition of the polymerization initiator is likely to occur due to oxygen. Therefore, since the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be appropriately reduced, frame-shaped luminance unevenness may occur on the display screen of the liquid crystal display device. Can be further suppressed.

  Although the second aging step is performed after the first aging step in the present embodiment, the present invention is not limited to this. Specifically, the step of irradiating the liquid crystal module 2 with the light of the backlight 300 by making the light emission intensity of the peripheral area of the backlight 300 higher than the light emission intensity of the central area of the backlight 300 is performed first, and thereafter. Alternatively, the step of setting all the backlights 300 to irradiate the liquid crystal module 2 with the light of the backlights 300 may be performed.

(Embodiment 3)
Next, a third embodiment will be described with reference to FIG. FIG. 9 is a diagram schematically showing a specific example of the aging step in the method of manufacturing the liquid crystal display device according to the third embodiment. Note that, also in FIG. 9, as in FIG. 4, the first display panel 100, the joining member 500, and the second display panel 200 are illustrated separately for convenience of description.

  As shown in FIG. 9, also in the present embodiment, as in Embodiments 1 and 2, when the liquid crystal module 2 is aged, the backlight 300 included in the liquid crystal display device 1 is used. It irradiates visible light.

  However, in the present embodiment, not only the visible light is emitted from the second display panel 200 side of the liquid crystal module 2, but also the visible light is emitted from the first display panel 100 side of the liquid crystal module 2. Aging.

  Specifically, on the first display panel 100 side of the liquid crystal module 2, an illumination device 301 that emits visible light is arranged. As the lighting device 301, for example, a backlight having the same configuration as the backlight 300 can be used, but the lighting device 301 is not limited to this. Note that in this embodiment, the backlight 300 and the lighting device 301 are all lit.

  As an example, under a temperature environment of 30 ° C. to 50 ° C. (for example, a constant temperature environment of 45 ° C.) for about 3 to 20 days (for example, about 14 days), the light of the backlight 300 and the illumination device 301 is supplied to the liquid crystal module. Irradiate 2 continuously. In this case, the liquid crystal module 2 may be irradiated with light from the backlight 300 and the lighting device 301 in an environment where oxygen is less than that in the atmosphere (such as a nitrogen atmosphere or a reduced pressure atmosphere).

  Further, in the present embodiment, when the liquid crystal module 2 is aged, a white image is displayed on both the first display panel 100 and the second display panel 200.

  Thereby, the light emitted from the backlight 300 arranged on the second display panel 200 side of the liquid crystal module 2 is transmitted through the entire second image display area 201 of the second display panel 200, and thus the bonding member 500 is 2 The light of the backlight 300 irradiates the entire surface of the display panel 200 side.

  Further, the light emitted from the illumination device 301 arranged on the first display panel 100 side of the liquid crystal module 2 is transmitted through the entire first image display area 101 of the first display panel 100, and thus the first joining member 500 The light of the illumination device 301 irradiates the entire surface of the display panel 100 side.

  Thus, in the present embodiment, both surfaces of the joining member 500 are irradiated with visible light. That is, visible light enters the joining member 500 from both sides of the joining member 500. Thereby, the additional curing of the polymerization initiator remaining in the joining member 500 can be further promoted, and the additional curing reaction can be efficiently performed. Therefore, the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be effectively reduced in a short time.

  Although the liquid crystal module 2 is aged by performing the aging process once in this embodiment, the aging process may be performed in two steps as in the second embodiment.

(Modification of Embodiment 3)
Next, a modified example of the third embodiment will be described with reference to FIG. FIG. 10 is a diagram schematically showing a specific example of the aging step in the method of manufacturing the liquid crystal display device according to the modification of the third embodiment. In FIG. 10, the first display panel 100, the joining member 500, and the second display panel 200 are illustrated separately for convenience of description, as in FIG. 4.

  As shown in FIG. 9, in this modification as well, in the aging step of the liquid crystal module 2, the backlight 300 and the lighting device 301 irradiate the liquid crystal module 2 with visible light. The light of the backlight 300 is applied to the end region of the joining member 500 with a higher intensity than the central region of the joining member 500.

  Specifically, in the third embodiment, a white image is displayed on the second display panel 200, and the peripheral area and the central area of the second image display area 201 on the second display panel 200 have the same transmittance. Although the second display panel 200 was controlled so that the liquid crystal module 2 was aged, in the present modification, the transmittance of the peripheral area of the second image display area 201 in the second display panel 200 is changed to the second image display. The liquid crystal module 2 is aged by making the transmittance higher than the central region of the region 201. Specifically, by making the gradation of the pixels in the peripheral area of the second image display area 201 higher than the gradation of the pixels in the central area of the second image display area 201, the transparency of the peripheral area of the second image display area 201 is increased. The transmittance is set higher than the transmittance of the central area of the second image display area 201. In this way, by making the transmittance of the peripheral area of the second image display area 201 in the second display panel 200 higher than the transmittance of the central area of the second image display area 201, the visible light radiated to the joining member 500 is visible. The intensity of light is higher in the end region of the joining member 500 than in the central region of the joining member 500.

  In this modification, the gradation of the pixels in the outer area A1 of the second display panel 200 is set higher than the gradation of the pixels in the inner area A2 of the second display panel 200. In this case, the gradation of the pixels in the outer area A1 of the second display panel 200 is preferably 1.5 times or more (for example, about twice) higher than the gradation of the pixels in the inner area A2 of the second display panel 200. .. In addition, also in the present embodiment, the outer area A1 and the inner area A2 of the second display panel 200 are the same as those in the first modification of the first embodiment.

  In this case, by displaying white in the peripheral area of the second image display area 201 in the second display panel 200 and displaying black in areas other than the peripheral area in the second image display area 201, the second display panel The transmittance of the peripheral area of the second image display area 201 in 200 may be higher than the transmittance of the central area of the second image display area 201. That is, the area of the joining member 500 facing the area other than the peripheral area of the second image display area 201 of the second display panel 200 may not be irradiated with the light of the backlight 300. For example, white may be displayed in the outer area A1 of the second display panel 200 and black may be displayed in the inner area A2 of the second display panel 200. Accordingly, the area of the joining member 500 facing the inner area A2 of the second display panel 200 is not irradiated with the light of the backlight 300, and the end of the joining member 500 facing the outer area A1 of the second display panel 200. The light of the backlight 300 is applied only to the partial area.

  As described above, in this modification, when the liquid crystal module 2 is aged, the transmittance of the peripheral area of the second image display area 201 in the second display panel 200 is set to the transmittance of the central area of the second image display area 201. Is higher than.

  As a result, the intensity of the light of the backlight 300 transmitted through the second display panel 200 and applied to the joining member 500 is higher in the end region of the joining member 500 than in the central region of the joining member 500. As a result, the additional curing reaction of the polymerization initiator can be efficiently carried out in the end region of the joining member 500 where the polymerization inhibition of the polymerization initiator is likely to occur due to oxygen. Therefore, since the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be appropriately reduced, frame-shaped luminance unevenness may occur on the display screen of the liquid crystal display device. Can be further suppressed.

  In the present modification, the transmittance of the peripheral area of the second image display area 201 on the second display panel 200 is set to the central area of the second image display area 201 while the white image is displayed on the first display panel 100. Although the liquid crystal module 2 was aged with a higher transmittance than the above, the invention is not limited to this. For example, with the white image displayed on the second display panel 200, the transmittance of the peripheral area of the first image display area 101 in the first display panel 100 is set to the transmittance of the central area of the first image display area 101. The liquid crystal module 2 may be aged at a higher rate than the rate. That is, when the liquid crystal module 2 is aged, a white image is displayed on one of the first display panel 100 and the second display panel 200, and an image is displayed on the other of the first display panel 100 and the second display panel 200. The transmittance of the peripheral area of the display area may be set higher than the transmittance of the central area.

  Further, in this modification, the transmittance of the peripheral area of the image display area of the first display panel 100 or the second display panel 200 is made higher than the transmittance of the central area, so that it is stronger than the central area of the joining member 500. Although the light of the backlight 300 is irradiated to the end region of the joining member 500 with high intensity, the backlight of the backlight 300 or the lighting device 301 is partially driven similarly to the first modification of the first embodiment. By making the light emission intensity of the peripheral region of the lighting device 300 or the lighting device 301 higher than the light emission intensity of the central region of the backlight 300 or the lighting device 301, the end region of the bonding member 500 is stronger than the central region of the bonding member 500. Alternatively, the light of the backlight 300 or the lighting device 301 may be emitted.

  Also, in this modification, the aging of the liquid crystal module 2 is performed by one aging step, but the aging step may be performed in two stages as in the second embodiment.

(Embodiment 4)
Next, a fourth embodiment will be described with reference to FIG. FIG. 11 is a sectional view schematically showing a specific example of the aging step in the method of manufacturing the liquid crystal display device according to the fourth embodiment.

  As shown in FIG. 11, in the present embodiment, when aging the liquid crystal module 2, visible light is emitted toward the end surface (side surface) of the joining member 500. Specifically, the illuminating device 302 that radiates visible light such as white light is used to radiate visible light toward the end surface of the joining member 500.

  In this case, the liquid crystal module 2 may be aged by displaying a black image on both the first display panel 100 and the second display panel 200. That is, the end surface of the joining member 500 may be irradiated with visible light only by the light from the lighting device 302.

  Thereby, when accelerating the additional curing of the polymerization initiator in the entire joining member 500, in the end region of the joining member 500 in which polymerization inhibition of the polymerization initiator is likely to occur due to oxygen, the additional curing reaction of the polymerization initiator is performed. It can be done efficiently. Therefore, since the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be appropriately reduced, frame-shaped luminance unevenness may occur on the display screen of the liquid crystal display device. Can be effectively suppressed.

  Note that the lighting device 302 that irradiates the end surface of the joining member 500 with visible light is preferably arranged over the entire circumference of the joining member 500. That is, it is preferable that visible light be emitted over the entire circumference of the end surface of the bonding member 500.

  Further, in the present embodiment, the black image is displayed on both the first display panel 100 and the second display panel 200, but the present invention is not limited to this. For example, with the black image displayed on the first display panel 100 and the white image displayed on the second display panel 200, the second display of the liquid crystal module 2 is performed using the backlight 300 included in the liquid crystal display device 1. Visible light may be emitted from the panel 200 side. In this case, the surface of the joining member 500 on the second display panel 200 side is illuminated with the light of the backlight 300, and the end surface of the joining member 500 is illuminated with the light of the illumination device 302.

  As a result, in the end region of the joining member 500 where the polymerization inhibition of the polymerization initiator is likely to occur due to oxygen, the additional curing reaction of the polymerization initiator can be efficiently performed. Therefore, since the difference in the curing reaction rate of the photocurable resin between the end region and the central region of the joining member 500 can be appropriately reduced, frame-shaped luminance unevenness may occur on the display screen of the liquid crystal display device. Can be further suppressed.

(Other modifications)
Although the liquid crystal display device according to the present disclosure has been described above based on the embodiment, the present disclosure is not limited to the above embodiment.

  For example, the curable resin includes a thermosetting resin and a photocurable resin, but the joining member 500 in the above-described embodiment is composed of only the photocurable resin of the thermosetting resin and the photocurable resin. However, it is not limited to this. Specifically, the joining member 500 may be made of both a thermosetting resin and a photocurable resin.

  In addition, in the above-described first to fourth embodiments, the joining member 500 is composed of one layer, but it may be composed of a plurality of layers. For example, the joining member 500 may be composed of a plurality of adhesive layers stacked in the thickness direction.

  In addition, in the above-described first to fourth embodiments, the first display panel 100 displays the color image and the second display panel 200 displays the monochrome image, but the present invention is not limited to this. For example, the first display panel 100 may display a monochrome image and the second display panel 200 may display a color image.

  Further, although two display panels are used in the first to fourth embodiments, the number of display panels is not limited to this. For example, three or more display panels may be used. In this case, the joining member may be inserted between every two adjacent display panels.

  In addition, in the above-described first to fourth embodiments, the joining member 500 joins the first display panel 100 and the second display panel 200, but the present invention is not limited to this. Specifically, as shown in FIG. 12, the joining member 500 may join the first display panel 100 and the transparent substrate 600. The transparent substrate 600 is a protective substrate made of, for example, a glass substrate or a transparent resin substrate. In this case, the liquid crystal display device including the first display panel 100 and the transparent substrate 600 bonded by the joining member 500 and the backlight 300 can be used as a display device such as a digital signage or a touch panel.

  Further, the technique of the present disclosure can be applied not only to the method of manufacturing a liquid crystal display device but also to the liquid crystal display device itself.

  In this case, the liquid crystal display device of the present disclosure is arranged, for example, on the liquid crystal module 2 having the first display panel 100 and the second display panel 200 joined by the joining member 500, and on the second display panel 200 side of the liquid crystal module 2. The liquid crystal module 2 has a function of performing a aging process of displaying a black image on the first display panel 100 and irradiating the liquid crystal module 2 with the light of the backlight 300. That is, after the liquid crystal display device is shipped (for example, in the state where the display incorporating the liquid crystal display device is installed), the liquid crystal display device itself performs the aging process. In this case, since the first display panel 100 located on the user side displays black, the light of the backlight 300 does not reach the user even if the light of the backlight 300 is emitted due to the aging process. That is, the aging process can be performed without the user's notice. This aging process can be performed, for example, when an image is not displayed on the screen of a display having a liquid crystal display device (for example, when the light is off). Further, the aging process can be performed by a circuit incorporated in the liquid crystal display device or the display, for example. That is, the liquid crystal display device or the display may have a circuit for automatically performing the aging process at a predetermined time. Further, the first to fourth embodiments described above can be applied to this aging process. For example, when performing the aging process, the light emission intensity of the peripheral area of the backlight 300 is set to be higher than the light emission intensity of the central area of the backlight 300, or the peripheral area of the second image display area 201 of the second display panel 200 is changed. The transmittance may be higher than the transmittance of the central area of the second image display area 201. The aging time when the aging process is performed may be determined based on the display usage time (the backlight lighting time when displaying an image), the temperature history, and the like.

  In addition, forms obtained by applying various modifications to those skilled in the art to the above-described embodiments and modifications, and any combination of components and functions in the embodiments and modifications without departing from the gist of the present disclosure A form realized by that is also included in the present disclosure.

1 Liquid Crystal Display Device 2 Liquid Crystal Module 100 First Display Panel 101 First Image Display Area 102 First Source Driver 103 First Gate Driver 104 First Source FPC
105 1st gate FPC
106 first circuit board 110 first liquid crystal cell 111 first TFT substrate 112 first counter substrate 113 first liquid crystal layer 120 first polarizing plate 121 first polarizing plate 121a, 221a polarizer 121b, 221b light diffusion adhesive layer 122 on the bonding side Non-bonding side first polarizing plate 200 Second display panel 201 Second image display area 202 Second source driver 203 Second gate driver 204 Second source FPC
205 2nd gate FPC
206 Second Circuit Board 210 Second Liquid Crystal Cell 211 Second TFT Substrate 212 Second Counter Substrate 213 Second Liquid Crystal Layer 220 Second Polarizing Plate 221 Second Polarizing Plate on Bonding Side 222 Second Polarizing Plate on Non-bonding Side 300 Backlight 301 , 302 Lighting device 410 First timing controller 420 Second timing controller 430 Image processing unit 500 Joining member 600 Transparent substrate

Claims (28)

A joining step of producing a liquid crystal module by joining the first display panel and the second display panel or the transparent substrate with a joining member made of a photocurable resin;
An aging step of performing aging by irradiating the liquid crystal module with visible light,
Liquid crystal display device manufacturing method. In the aging step, visible light is emitted using a backlight included in the liquid crystal display device.
The method for manufacturing a liquid crystal display device according to claim 1. The first display panel is joined to the second display panel by the joining member,
In the aging step, visible light is emitted from the second display panel side of the liquid crystal module,
The method for manufacturing a liquid crystal display device according to claim 2. In the aging step, the second display panel displays a white image,
The method for manufacturing the liquid crystal display device according to claim 3. The second display panel has a liquid crystal cell and a polarizing plate provided on a surface of the liquid crystal cell on the side of the bonding member.
The method for manufacturing a liquid crystal display device according to claim 4. In the aging step, the first display panel displays a black image,
A method for manufacturing the liquid crystal display device according to claim 4. In the aging step, the transmittance of the peripheral area of the image display area of the second display panel is made higher than the transmittance of the central area of the image display area of the second display panel,
A method for manufacturing the liquid crystal display device according to claim 3. In the aging step, the gradation of the pixels in the peripheral area of the image display area of the second display panel is made higher than the gradation of the pixels in the central area of the image display area of the second display panel, whereby the second display panel The transmittance of the peripheral area of the image display area is higher than the transmittance of the central area of the image display area of the second display panel,
A method for manufacturing a liquid crystal display device according to claim 7. In the aging step, the gradation of the pixels in the peripheral area of the image display area of the second display panel is 1.5 times or more higher than the gradation of the pixels in the central area of the image display area of the second display panel. Is
The method for manufacturing a liquid crystal display device according to claim 8. In the aging step, white is displayed in a peripheral area of the image display area of the second display panel, and black is displayed in an area other than the peripheral area in the image display area of the second display panel, The transmittance of the peripheral area of the image display area of the second display panel is made higher than the transmittance of the central area of the image display area of the second display panel,
A method for manufacturing a liquid crystal display device according to claim 7. When the length of the long side of the second display panel is L1 and the length of the short side of the second display panel is L2,
On the short side of the second display panel, the peripheral area of the image display area of the second display panel is L1 × 2 along the long axis direction of the second display panel with reference to the edge of the short side. % Position and the position of L1 × 20% position along the long axis direction with reference to the edge of the short side, and the long side of the second display panel is the long side. A position of L2 × 3% along the minor axis direction of the second display panel based on the edge of the side and a position of L2 × 30% along the minor axis direction of the edge of the long side. Located in the area between,
The method for manufacturing a liquid crystal display device according to claim 7. In the aging step, the emission intensity of the peripheral region of the backlight is made higher than the emission intensity of the central region of the backlight,
A method for manufacturing the liquid crystal display device according to claim 3. The aging step,
A first aging step of irradiating the liquid crystal module with the light of the backlight by making the peripheral area and the central area of the image display area of the second display panel have the same transmittance;
A second aspect of illuminating the liquid crystal module with light of the backlight by increasing a transmittance of a peripheral area of an image display area of the second display panel higher than a transmittance of a central area of an image display area of the second display panel. Including the aging step of
A method for manufacturing the liquid crystal display device according to claim 3. In the first aging step, while the backlight is all lights, a white image is displayed on the second display panel,
In the second aging step, the backlight is fully illuminated and the gradation of pixels in the peripheral area of the image display area of the second display panel is adjusted to that of pixels in the central area of the image display area of the second display panel. By making it higher than the gradation, the transmittance of the peripheral area of the image display area of the second display panel is made higher than the transmittance of the central area of the image display area of the second display panel,
The method for manufacturing a liquid crystal display device according to claim 13. In the first aging step, while the backlight is all lights, a white image is displayed on the second display panel,
In the second aging step, white is displayed in a peripheral area of the image display area of the second display panel, and black is displayed in an area other than the peripheral area of the image display area of the second display panel. The transmittance of the peripheral area of the image display area of the second display panel is higher than the transmittance of the central area of the image display area of the second display panel.
The method for manufacturing a liquid crystal display device according to claim 13. The aging step,
A first aging step of making all the backlights and irradiating the liquid crystal module with the light of the backlights;
A second aging step of irradiating the liquid crystal module with the light of the backlight by making the light emission intensity of the peripheral region of the backlight higher than the light emission intensity of the central region of the backlight.
A method for manufacturing the liquid crystal display device according to claim 3. In the second aging step, only the peripheral area of the backlight is turned on,
The method for manufacturing a liquid crystal display device according to claim 16. In the aging step, visible light is also emitted from the first display panel side of the liquid crystal module,
The method for manufacturing the liquid crystal display device according to claim 3. In the aging step, the first display panel and the second display panel both display white.
The method for manufacturing a liquid crystal display device according to claim 18. In the aging step, a white image is displayed on one of the first display panel and the second display panel, and the transmittance of the peripheral area in the image display area is displayed on the other of the first display panel and the second display panel. Is higher than the transmittance of the central area in the image display area,
The method for manufacturing a liquid crystal display device according to claim 18. In the aging step, irradiating visible light toward the end surface of the joining member,
The method for manufacturing a liquid crystal display device according to claim 1. The first display panel is joined to the second display panel by the joining member,
In the aging step, the first display panel and the second display panel both display black.
A method of manufacturing a liquid crystal display device according to claim 21. In the aging step, a white image is displayed on the second display panel, and visible light is emitted from the second display panel side of the liquid crystal module using a backlight included in the liquid crystal display device.
A method of manufacturing a liquid crystal display device according to claim 21. In the aging step, the liquid crystal module is aged under an environment where oxygen is less than the atmosphere,
The method for manufacturing the liquid crystal display device according to claim 1. The environment with less oxygen is under a nitrogen atmosphere or a reduced pressure atmosphere,
The method for manufacturing a liquid crystal display device according to claim 24. A liquid crystal module having a first display panel and a second display panel joined by a joining member;
A backlight disposed on the second display panel side of the liquid crystal module,
An aging process of displaying a black image on the first display panel and irradiating the liquid crystal module with light of the backlight is performed.
Liquid crystal display device. When performing the aging treatment, the emission intensity of the peripheral region of the backlight is higher than the emission intensity of the central region of the backlight,
The liquid crystal display device according to claim 26. When performing the aging process, the transmittance of the peripheral area of the image display area of the second display panel is higher than the transmittance of the central area of the image display area of the first display panel,
The liquid crystal display device according to claim 26.