JP2008009189A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which allows the relative position of a display panel and a function panel to be highly precisely controlled and is excellent in display grade and reliability. <P>SOLUTION: The display device has such a structure that the display panel having a display element between a pair of substrates is stacked on the function panel having at least one substrate, wherein an adhesive layer is disposed between the display panel on a display region and the function panel, and the display and/or the function panel has an adhesive sump part of a groove part, an inclination part or the like on a non-display region. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a display device. More specifically, the present invention relates to a display device including a display panel and a functional panel such as a parallax barrier panel, a viewing angle variable panel, a 2D / 3D variable panel, and a touch panel.

2. Description of the Related Art In recent years, flat panel displays (hereinafter also referred to as “FPD”), which can be thinned, have become widespread as display devices such as televisions, personal computer displays, and mobile terminal displays. Examples of FPDs currently in practical use include liquid crystal display devices, plasma display panels (hereinafter also referred to as “PDP”), and the like. Further, as FPDs expected to be put to practical use in the future, organic electroluminescence display devices (hereinafter also referred to as “organic EL displays”), field emission displays (hereinafter also referred to as “FEDs”), and the like. Can be mentioned.

Among such FPDs, the liquid crystal display device can be easily reduced in thickness and power consumption, and can be applied to a wide range of screen sizes from small to large. Therefore, liquid crystal display devices are used in a wide range of applications such as televisions, personal computer displays, and portable terminal displays. In general, a liquid crystal display device performs display by electrically controlling the alignment direction of liquid crystal sandwiched between a pair of substrates and adjusting the amount of light supplied from a backlight.

In addition, a display device having various functions in addition to a normal image display function (hereinafter also referred to as “functionalized display”) has been developed. As a representative example of a functionalized display, a display device having a touch panel (hereinafter also referred to as “touch panel display”) has been put into practical use. Patent Document 1 discloses a technique for disposing a touch panel and a liquid crystal cell with a gap in a liquid crystal display device having a touch panel.

Furthermore, as a functionalized display, it is possible to switch between a narrow viewing angle display and a wide viewing angle display (hereinafter also referred to as “bale view display”), and a stereoscopic image display in addition to a planar image display. Some display devices (hereinafter also referred to as “3D displays”) have been put into practical use. More specifically, the bale view display includes a viewing angle variable element (hereinafter also referred to as “viewing angle variable panel”) in which a liquid crystal layer is sandwiched between a pair of substrates provided with a transparent electrode layer. A liquid crystal display device (see, for example, Patent Document 2) that switches between a wide viewing angle and a narrow viewing angle by electrically changing the layer state of the liquid crystal layer of the angle variable element or the alignment direction of the liquid crystal molecules is disclosed. . On the other hand, the 3D display includes an electronic barrier (hereinafter also referred to as “2D / 3D variable panel”) having the same configuration as that of the liquid crystal display panel, and generates a barrier stripe of any shape electrically in the electronic barrier. Accordingly, a liquid crystal display device (see, for example, Patent Document 3) that allows a planar image to be visually recognized as a stereoscopic image is disclosed.

A display device (hereinafter also referred to as “dual view display”) that can separate display light in different directions, for example, left and right directions, and display images having different contents depending on the position viewed on one screen has been put into practical use. The dual view display includes a parallax optics (hereinafter also referred to as “parallax barrier panel”) provided with a slit-shaped light shielding portion corresponding to a pixel, so that two or more images can be viewed from different directions. A liquid crystal display device (see, for example, Patent Document 4) that displays so as to be visible is disclosed.

Thus, a functionalized display normally exhibits various functions by stacking functional panels such as a touch panel, a viewing angle variable panel, a 2D / 3D variable panel, and a parallax barrier panel in addition to a display panel. Can do. Therefore, in the functionalized display, the panels need to be fixed in a state where the relative position between the display panel and the functional panel is controlled with high accuracy. More specifically, the horizontal position of the function panel relative to the display panel and the distance between the display panel and the function panel need to be controlled with high accuracy. In particular, in order to realize excellent display quality in a dual view display, the display panel and the parallax barrier panel need to be fixed with high accuracy and at a very narrow interval.

On the other hand, as a technique for fixing a functional panel to a display panel, a technique for bonding panels using a double-sided tape has been known. For example, the touch panel is usually bonded to the display panel with a double-sided tape in a non-display area not related to display. However, the method of partially bonding the display panel and the functional panel with an adhesive tape such as double-sided tape is not satisfactory from the viewpoint of controlling the relative position between the display panel and the functional panel with high accuracy. It was.
JP 2001-201741 A JP-A-9-105958 Japanese Patent Laid-Open No. 3-119889 Japanese Patent Laid-Open No. 2005-78094

Therefore, the inventors have focused on a method of bonding the entire surface of the display panel and the functional panel with an adhesive as a fixing method capable of controlling the relative position between the display panel and the functional panel with high accuracy. Here, with reference to FIG. 20, a method of bonding the display panel and the functional panel, which has been studied by the present inventors, will be described.

In order to adhere the entire surface of the display panel and the functional panel, first, as shown in FIG. 20A, the adhesive 631 made of a photo-curing resin is applied on the display panel 610 with a slit coater 671 (application process). ). Next, as illustrated in FIG. 20B, the functional panel 620 was placed on the display panel 610 via the adhesive 631 in a vacuum. Then, the space | interval of the display panel 610 and the function panel 620 was controlled to desired length by pressing the function panel 620 with a tool (not shown) (pressurization process). Next, as shown in FIG. 20C, the functional panel 620 is moved in the horizontal direction by the chuck 672 as a fixing member, and the horizontal position of the functional panel 620 with respect to the display panel 610 (hereinafter also referred to as “panel position”). Was controlled to a desired position (alignment step). Finally, as shown in FIG. 20D, light 673 such as ultraviolet rays is irradiated from above the functional panel 620 while the functional panel 620 is fixed by a chuck (not shown) to cure the adhesive (light Curing step). According to this method, the display panel and the functional panel can be fixed by the adhesive layer disposed on substantially the entire surface of the panel. Therefore, the relative position between the display panel and the function panel can be controlled with high accuracy.

However, in this case, the adhesive may leak from between the display panel and the functional panel. For this reason, the outer edge of the display panel, the terminal for connecting the driver provided in the outer peripheral area of the display panel, etc. are contaminated, and a process for cleaning the leaked adhesive is required. As described above, when the entire surface bonding method is used, there is room for improvement in that the manufacturing process becomes complicated. In addition, a connection failure may occur between the driver and the terminal, and the reliability of the module is lowered. Furthermore, there is room for improvement in that display unevenness occurs near the edge of the display area.

The present invention has been made in view of the above situation, and an object of the present invention is to provide a display device in which the relative position between the display panel and the functional panel is controlled with high accuracy and has excellent display quality and reliability. To do.

The inventors of the present invention conducted various studies on a display device in which the relative position between the display panel and the functional panel is controlled with high accuracy and has excellent display quality and reliability. It was found that leakage of adhesive occurs due to two patterns. That is, as shown in FIG. 21, the distance between the display panel 610 and the function panel 620 (hereinafter also referred to as “panel distance”) is small due to the pressure applied to the function panel 620 and the weight of the function panel 620. As a result, the adhesive 631 leaks through the gap between the chuck 672 and the display panel 610 due to capillary action as shown in FIG. Further, when the adhesive leaks, it has been found that even if the leakage of the adhesive is cleaned, poor connection between the driver and the terminal occurs due to the adhesive that cannot be removed. Furthermore, since the degree of shrinkage due to curing differs between the part where the adhesive leaks and the part where the adhesive does not leak, the panel spacing changes in the vicinity of the outer edge of the display panel and the functional panel, and display unevenness occurs.

Therefore, the inventors have further studied and focused attention on the form of the adhesive layer side of the display panel and the functional panel. The display panel and the functional panel are usually flat plates (planar plates), and when these flat plates are pressurized with the adhesive interposed, the adhesive (usually a viscous liquid) It is easy to spread between the flat plates, and as a result, it is found that excess adhesive leaks from between the flat plates (display panel and functional panel). By having an adhesive layer in between, the relative position between the display panel and the functional panel can be controlled with high accuracy. Further, the display panel and / or the functional panel has an adhesive reservoir in an area outside the display that is not related to display. By having an adhesive reservoir that has spread and having a function of preventing leakage, it has been found that the occurrence of defects and deterioration in quality due to adhesive leakage can be suppressed. Conceive that can be admirably solved the problem, it is the present invention has been completed.

That is, the present invention is a display device having a structure in which a display panel and a functional panel are laminated, and the display device includes an adhesive layer between the display panel and the functional panel in a display region, and the display The panel and / or the functional panel is a display device having an adhesive reservoir in a non-display area. As a result, it is possible to realize a display device in which the relative position between the display panel and the functional panel is controlled with high accuracy, and which has excellent display quality and reliability.

The display panel means an optical element that has a display element between a pair of substrates and electrically generates or controls light by the display element. For example, a liquid crystal display panel is usually an optical element that has a substrate with a liquid crystal layer sandwiched therebetween and electrically controls the amount of light transmitted and / or reflected by the liquid crystal layer.

The display element is an element having a light emitting function or a dimming function (light shutter function). For example, a liquid crystal display panel usually includes a display element having a dimming function between a pair of substrates. More specifically, a liquid crystal display panel usually exhibits a dimming function by changing a voltage applied to an electrode provided on a substrate and changing an alignment direction of liquid crystal sandwiched between the substrates. be able to.

Furthermore, the display device means a display module in which a display panel is integrated by combining circuits such as a drive circuit and a control circuit. For example, a transmissive liquid crystal display device usually includes various circuits, a backlight module, and the like.

The functional panel is a panel that has at least one substrate and adds a function to the display by the display panel, such as changing display characteristics or providing a touch input function.

The configuration of the display device of the present invention is not particularly limited as long as such components are formed as essential, and other components may or may not be included. .
A preferred embodiment of the display device of the present invention will be described in detail below.

Preferable forms of the adhesive reservoir part include a groove part and an inclined part. According to these forms, leakage of the adhesive can be easily and sufficiently prevented.

It is preferable that the groove has a depth such that the thickness of the panel constituting substrate in the portion where the groove is formed is greater than 50 μm. Thereby, the intensity | strength of the board | substrate of the display panel and / or functional panel in which the groove part was formed can fully be maintained.

It is preferable that the adhesive reservoir is disposed outside the light shielding layer provided on the outer periphery of the display panel. Thereby, the display device of the present invention having excellent display quality can be easily realized.

It should be noted that being arranged outside the light shielding layer means being arranged in an area including an area overlapping with the light shielding layer and an area outside thereof when viewed from the front direction of the display surface of the display device. To do.

It is preferable that the adhesive reservoir has a substantially straight planar shape. Thereby, generation | occurrence | production of the leakage of an adhesive agent can be suppressed more effectively.

It is preferable that the adhesive reservoir portion is disposed at other than the four corners of the display panel and / or the functional panel whose planar shape is substantially square. Thereby, the relative position of the display panel and the function panel can be controlled with higher accuracy.

The adhesive layer is preferably configured to include a photocurable resin. Accordingly, the display panel and the function panel can be easily fixed in a state where the relative position between the display panel and the function panel is controlled to a desired position.

The functional panel is not particularly limited, but is a panel for displaying different images depending on viewing directions such as left and right and up and down (parallax barrier panel), and a panel (viewing angle) that can change the wide viewing angle and the narrow viewing angle as appropriate. A variable panel), a panel for converting a planar image into a three-dimensional image (2D / 3D variable panel), and a panel (touch panel) that enables information input on a display screen are suitable.

Especially, as said functional panel, a parallax barrier panel or a 2D / 3D variable panel is more preferable. In the case of a dual view display including a parallax barrier panel, the panel interval needs to be set very narrow, and the relative position between the display panel and the parallax barrier panel is required to be controlled with particularly high accuracy. Therefore, by applying the present invention, which can control the relative position between the display panel and the functional panel with high accuracy, to the dual view display, it is possible to effectively suppress defects caused by adhesive leakage and achieve excellent display. Two images can be displayed in different directions with different quality. In the case of a 3D display including a 2D / 3D variable panel, the relative position between the display panel and the parallax barrier panel needs to be controlled with very high accuracy. Therefore, as in the case of a dual view display, by applying the present invention to a 3D display, it is possible to display a stereoscopic image with excellent display quality while effectively suppressing defects caused by adhesive leakage. .

According to the display device of the present invention, the relative position between the display panel and the functional panel can be controlled with high accuracy, and excellent display quality and reliability can be realized.

Embodiments and examples will be described below, and the present invention will be described in more detail with reference to the drawings. However, the present invention is not limited only to these embodiments and examples.

(Embodiment 1)
The display device of Embodiment 1 will be described. The display device of this embodiment is a dual view display using a transmissive liquid crystal display device having a groove.

1A and 1B are schematic diagrams illustrating a display device of Embodiment 1, FIG. 1A is a schematic front view, and FIG. 1B is a schematic cross-sectional view taken along line X1-Y1 in FIG. In the present embodiment, a liquid crystal display device will be described as an example of the display device. However, the display device of the present invention is not particularly limited to a liquid crystal display device, and may be a PDP, an organic EL display, an FED, or the like.

As shown in FIG. 1, the display device 100 according to the present embodiment includes a display panel 110, a parallax barrier panel 120 disposed on the display surface side of the display panel 110, and the display panel 110 and the parallax barrier panel 120. The provided adhesive layer 130, the polarizing plate 142 disposed on the rear side of the display panel 110, the polarizing plate 141 disposed on the display surface side of the parallax barrier panel 120, and the rear side of the display panel 110. A backlight unit (not shown) and a bezel (not shown) for holding these components. A retardation plate may be disposed inside the polarizing plates 141 and 142 (on the side of the substrate 111 and the parallax barrier panel 120 described later).

As a structure of a backlight unit, what is necessary is just to have general structures, such as a light source, a reflecting plate, and optical sheets. Further, the backlight unit may be a direct type or an edge light type. Furthermore, the display device 100 is not limited to the transmissive type, and may be a reflective type or a transflective type.

The display panel 110 includes a pair of substrates 111 and 112, a liquid crystal layer 113 sandwiched between the substrate 111 and the substrate 112, and a sealing material 114 and a light shielding layer 115 disposed along the outline of the substrate 112. As a material of the substrate 111 and the substrate 112, glass or light-transmitting resin excellent in light-transmitting property and workability is preferable.

On the liquid crystal layer 113 side of the substrate 111 and the substrate 112, a thin film transistor (TFT) which is a switching element, a pixel electrode, a bus wiring, an alignment film, a black matrix (BM), and the like are provided as display element components of the liquid crystal display panel. It has been. That is, the substrate 111 is a so-called TFT array substrate, while the substrate 112 is a so-called color filter substrate (CF substrate). The substrate 111 has a driver unit 117 for arranging a driver. As described above, the display panel 110 is an active matrix liquid crystal display panel in which pixels are arranged in a matrix.

The light shielding layer 115 is a member for shielding light, and is disposed on the liquid crystal layer 113 side of the substrate 112. Thus, the light shielding layer 115 is a so-called frame black portion. The light-transmitting area surrounded by the light shielding layer 115 becomes a display area 150 in which a plurality of pixels are arranged. On the other hand, the light shielding area outside the light shielding layer 115 is a display outside area 160.

The light shielding layer 115 is usually formed by the same process using the same material as that of the BM. Thereby, the display area 160 and the non-display area 170 can be partitioned without complicating the manufacturing process.

Thus, in this specification, the display area means an area where an image is displayed and the image is visually recognized by an observer. On the other hand, the non-display area means an area where an image is not visually recognized by an observer. It should be noted that no image is normally displayed in the non-display area. Further, as shown in FIG. 1, the display area is usually an area surrounded by a non-display area. Further, the non-display area is usually composed of a light shielding layer (frame black portion), a light shielding member such as a light shielding tape, and an area shielded by a bezel.

Therefore, in the present embodiment, the non-display area 160 may be formed using a light shielding tape, a bezel, or the like instead of the light shielding layer 115 including the frame black portion. Note that when a light shielding tape is used, the light shielding tape may be attached to the display panel 110, the parallax barrier panel 120, the backlight unit, or the like.

The sealing material 114 is a member for sealing the liquid crystal layer 113 between the substrates 111 and 112, and is disposed so as to overlap the light shielding layer 115. The materials for the sealing material 114 and the liquid crystal layer 113 are not particularly limited, and may be appropriately selected.

The liquid crystal mode of the display panel 110 is not particularly limited, and examples thereof include a TN (Twisted Nematic) mode, an IPS (In Plane Switching) mode, and a VATN (Vertical Alignment Twisted Nematic) mode. In addition, the display device of the present embodiment may be one obtained by orientation division.

The polarizing plates 141 and 142 are usually arranged so that the absorption axis direction thereof is substantially orthogonal or substantially parallel. Note that the polarizing plate 141 may be disposed on the display surface side of the display panel 110.

The parallax barrier panel 120 is a functional panel for separating transmitted light in the left-right direction. More specifically, the parallax barrier panel 120 includes a substrate 121 and a stripe-shaped parallax barrier 122 formed on the display panel 110 side of the substrate 121. The parallax barrier 122 is disposed along the pixel array of the display panel 110. On the other hand, the display panel 110 can display a right display image and a left display image for each column corresponding to the parallax barrier 122. Accordingly, the display device 100 can display two images in the left-right direction.

The adhesive layer 130 is a layer made of a translucent adhesive and is disposed between the display panel 110 and the functional panel 120 in the display area 150. That is, the adhesive layer 130 is provided so as to overlap at least the entire display region 150 when viewed from the front direction of the display surface of the display device 100. In this manner, the relative position between the parallax barrier panel 120 and the display panel 110 can be controlled with high accuracy by bonding the parallax barrier panel 120 and the display panel 110 over substantially the entire surface. Further, the outline of the adhesive layer 130 is not visually recognized in the display area. Note that the adhesive layer 130 may be disposed inside a groove portion 123 described later as illustrated in FIG. 1B, or may not be disposed inside the groove portion 123.

As a material of the adhesive layer 130, that is, an adhesive, a resin is preferable. The resin usually has a higher light transmittance than air. Therefore, a decrease in light transmittance of the display device can be suppressed by using a resin as the adhesive. Also, the resin can be made very thin compared to an adhesive tape such as a double-sided tape. Accordingly, it is particularly preferable to use a resin as an adhesive in a dual view display in which the panel interval needs to be set very narrow. Further, from the viewpoint of improving display quality, the refractive index of the adhesive layer 130 is preferably substantially the same as the refractive indexes of the substrates of the display panel 110 and the parallax barrier panel 120. That is, in the present invention, it is preferable that the adhesive layer has a refractive index substantially the same as the refractive index of the substrate of the display panel and the functional panel.

As the resin used for the adhesive, a photocurable resin is suitable. Accordingly, the resin can be cured by irradiating the resin with light, for example, ultraviolet rays, with the parallax barrier panel fixed by the chuck. That is, the display panel and the functional panel can be easily bonded in a state where the relative position between the display panel and the functional panel is controlled to a desired position.

The adhesive layer 130 preferably has a storage elastic modulus at 23 ° C. of 1.0 × 10 ^{3 to} 1.0 × 10 ⁶ Pa. When a resin is used as an adhesive, normally, as the adhesive is cured, non-uniform shrinkage occurs between the outer peripheral portion of the adhesive layer (the portion disposed overlapping with a groove portion described later) and the inner central portion thereof. As a result, an internal stress is generated in the adhesive layer 130. As a result, the cell thickness of the display panel 110 is affected, and display unevenness may occur near the edge of the display region 150. However, by using the adhesive layer 130 whose storage elastic modulus at 23 ° C. is 1.0 × 10 ^{3 to} 1.0 × 10 ⁶ Pa, the internal stress is effectively absorbed by the elasticity of the adhesive layer 130 itself. be able to. Accordingly, the display quality of the display device 100 can thereby be improved.

In the dual view display, as will be described later, the substrate 112 on the adhesive layer 130 side of the display panel 110 has a very thin thickness and a very low rigidity. Therefore, the display panel 110 is particularly sensitive to the influence of the internal stress of the adhesive layer 130, and display unevenness is likely to occur. Therefore, by applying the relatively soft adhesive layer 130 having the above storage elastic modulus to the dual view display, the occurrence of display unevenness due to the internal stress can be particularly effectively suppressed.

Here, the pitch between the pixel and the parallax barrier in the present embodiment will be described.
The pitch and width of pixels (not shown) of the display panel 110 are 65 μm and 40 μm. At this time, the pitch of the parallax barrier 122 may be 120 μm, and the width of the parallax barrier 122 may be about 80 μm. Further, the distance from the light emitting surface of the display panel 110 (the surface of the substrate 112 on the liquid crystal layer 113 side) to the surface of the parallax barrier panel 120 on the adhesive layer 130 side may be about 0.1 mm. On the other hand, the thickness of a general substrate used for a display device, for example, a glass substrate is usually about 0.7 mm. Therefore, the substrate of the display panel on the parallax barrier panel side usually needs to be thinned. From such a viewpoint, the substrate 112 is thinned so as to have a thickness of 0.1 mm or less by glass etching or the like. As a result, the thickness of the adhesive layer 130 (corresponding to the panel interval) is about several tens of μm, which is very thin. As described above, when the parallax barrier panel is arranged in the display device, the panel interval needs to be set very narrow.

The parallax barrier panel 120 has a groove 123 in the outside display area 160. That is, in the present invention, the display panel and / or the functional panel has an adhesive reservoir in a region overlapping with a non-display region when viewed from the front direction of the display surface of the display device. Further, the adhesive reservoir is usually formed on the adhesive layer side of the display panel and / or the functional panel. Thus, the parallax barrier panel 120 has the groove part 123 formed along the outline, and thereby the groove part 123 functions to store an adhesive. Therefore, it is possible to effectively prevent the adhesive from leaking out between the display panel 110 and the parallax barrier panel 120 in the manufacturing process.

Regarding the form of the groove, first, the arrangement location and the cross-sectional shape of the groove will be further described below. 2A and 2B are schematic cross-sectional views showing modifications of the display device according to the first embodiment. FIG. 3 is a schematic cross-sectional view of the display device according to the first comparative example. FIGS. 4A and 4B are schematic cross-sectional views showing another modification of the display device according to the first embodiment.

In the present invention, the groove may be formed in the non-display area. Therefore, the groove 123 may be disposed outside the light shielding layer 115 as shown in FIG. In addition, the grooves 123 may be arranged in a plurality of rows as shown in FIG. On the other hand, as shown in FIG. 3, the configuration in which the groove portion 123 is disposed so as to overlap the display region 160 inside the light shielding layer 115 is included in the present invention because the display quality around the groove portion 123 is significantly reduced. Make it not exist.

As a cross-sectional shape of the groove portion, in addition to the substantially U-shape shown in FIG. 1B, a substantially U-shape as shown in FIG. 4A, and a substantially V-shape as shown in FIG. However, from the viewpoint of ease of implementation in manufacturing, a substantially U-shape is preferable. Here, the cross-sectional shape is a cross-sectional shape taken along line X1-Y1 in FIG.

Next, the planar shape of the groove will be described. 5A to 5C are schematic front views showing other planar shapes of the groove portions in the display device of Embodiment 1. FIG. In the present specification, the planar shape is a shape when viewed from the front direction of the display surface of the display device.

As shown in FIG. 5A, the groove 123 may be formed so that the planar shape is a curved shape, for example, a wave shape. Moreover, the groove part 123 may be arrange | positioned so that a planar shape may become dot shape, as shown in FIG.5 (b). However, as shown in FIG. 1A, the groove 123 is preferably formed so that the planar shape is substantially straight. As a result, the adhesive easily flows in the groove portion 123 and easily expands in the groove portion 123, so that the occurrence of adhesive leakage can be more effectively suppressed.

Further, as shown in FIG. 5C, the groove portion 123 may be arranged so that the planar shape is a substantially square shape (substantially square donut shape). That is, the groove 123 may be disposed on the entire outer periphery of the parallax barrier panel 120. However, it is preferable that the groove portions 123 are arranged at other than the four corners of the parallax barrier panel 120, and more preferably at four sides other than the four corners of the parallax barrier panel 120 as shown in FIG. Thereby, the alignment marks 124 can be arranged at the four corners of the parallax barrier panel 120.

Here, the arrangement form of the alignment marks in this embodiment will be described. 6A is an enlarged schematic view of a region surrounded by a two-dot chain line in FIG. 1A, and FIG. 6B is a schematic cross-sectional view taken along line X2-Y2 in FIG. 6A. is there.

The alignment mark 124 is a mark provided on the parallax barrier panel 120 to align the horizontal position (panel position) of the parallax barrier panel 120 with respect to the display panel 110. The alignment mark 124 is formed by the same process using the same material as the parallax barrier 122. Then, as shown in FIGS. 6A and 6B, the alignment mark 124 is provided in an area where the four corner grooves 123 of the parallax barrier panel 120 are not disposed. On the other hand, the light shielding layer 115 of the display panel 110 has an opening 116 in a region corresponding to the alignment mark 124. By aligning the alignment marks 124 and the openings 116, the panel position can be adjusted to a desired position. Further, since the alignment marks 124 are arranged at the four corners (on the diagonal lines) of the parallax barrier panel 120, the alignment marks 124 are arranged far apart in the parallax barrier panel 120. Therefore, the occurrence of the shift of the panel position can be more effectively suppressed.

The size of the groove 123 is not particularly limited, and may be set as appropriate according to the amount of adhesive applied. However, the depth of the groove 123 is set so that the thickness of the substrate (the substrate 121 in the first embodiment) in the region where the groove 123 is formed is larger than 50 μm from the viewpoint of maintaining the strength of the substrate on which the groove is formed. It is preferable to do. In addition, there exists a possibility that the board | substrate consisting of glass, a plastics, etc. may crack that the thickness of a board | substrate is 50 micrometers or less. Therefore, as in the present embodiment, when the display panel substrate on the functional panel side is thinned (in the case of a dual view display), the groove is preferably provided in the functional panel.

Below, the manufacturing method of the display apparatus of this embodiment is demonstrated.
First, the display panel 110 and the parallax barrier panel 120 are manufactured by a general method. Next, the substrate 112 of the display panel 110 is thinned by glass etching or the like so that the thickness becomes about 50 μm. Next, a groove is formed in the outside display area 160 of the parallax barrier panel 120.

In addition, it does not specifically limit as a formation method of a groove part, A chemical method may be sufficient and a physical method may be sufficient. The chemical method includes etching, and more specifically, when glass is used as the substrate material, glass etching using hydrogen fluoride is used. Moreover, dicing is mentioned as a physical method.

Next, as shown in FIG. 20, an adhesive application process on the display panel, a parallax barrier panel pressurizing process, a parallax barrier panel alignment process, and a photocuring process are sequentially performed. Thereby, the parallax barrier panel 120 can be fixed on the display panel 110 in a state where the relative position between the display panel 110 and the parallax barrier panel 120 is controlled with high accuracy. However, in the application process and the pressurization process, it is preferable that the application amount of the adhesive and the pressurization pressure and pressurization time of the parallax barrier panel are appropriately set, and thereby the panel interval is set to a desired size. Can be controlled. In addition, what is necessary is just to set the viscosity of an adhesive agent suitably, for example, it may be about 1000-2000 mPa * s (= CentiPoise) in 25 degreeC. Then, the display apparatus 100 can be produced by performing a module assembly process by a general method.

Here, how the groove portion stores the adhesive will be briefly described. FIG. 7 is a schematic cross-sectional view of the display device according to the first embodiment in the pressurizing step, where (a) is a state before the parallax barrier panel is placed on the display panel, and (b) is parallax. In this state, the barrier panel is pressed against the display panel.

As shown in FIG. 7A, from the state before the parallax barrier panel 120 is placed on the display panel 110 to which the adhesive 131 is applied, as shown in FIG. When 120 is pressed against the display panel 110, the adhesive 131 spreads to the outer peripheral side of the substrate and flows into the groove 123. As described above, from the viewpoint of effectively preventing leakage of the adhesive, the adhesive is preferably applied in a region surrounded by the groove (adhesive reservoir).

As described above, the groove functions as an adhesive reservoir that suppresses the spread of the adhesive. Therefore, the display device of this embodiment can effectively suppress leakage of the adhesive from between the display panel and the functional panel. And generation | occurrence | production of the display nonuniformity resulting from hardening shrinkage | contraction of the leaked adhesive agent can be suppressed, As a result, display quality can be improved.

In addition, the display device according to the present embodiment can effectively suppress the terminal of the driver portion of the substrate from becoming dirty with the adhesive. Therefore, the occurrence of poor connection between the driver and the terminal can be suppressed, and as a result, the reliability can be improved.

Furthermore, since the display panel and the parallax barrier panel are bonded on substantially the entire surface using an adhesive, the panel interval can be very narrow and the relative position of the display panel and the parallax barrier panel can be controlled with high accuracy. it can. Therefore, the display device of the present embodiment can effectively suppress the occurrence of display unevenness due to the positional deviation and thickness unevenness between the display panel and the parallax barrier panel, and as a result, has excellent display quality. A dual view display can be realized.

In the case where the PDP is applied to the display panel of the present embodiment, the present embodiment uses a display element composed of an electrode, a dielectric, a rare gas, a phosphor and the like instead of the display element using liquid crystal. The display panel may be manufactured.

Further, when an organic EL display is applied to the display panel of the present embodiment, the present embodiment uses a display element composed of an electrode, an organic thin film containing a light emitting material, etc., instead of a display element using liquid crystal. The display panel may be manufactured.

Further, when the FED is applied to the display panel of the present embodiment, the display panel of the present embodiment uses a display element composed of a microchip, a gate electrode, a phosphor and the like instead of the display element using liquid crystal. Can be produced.

As described above, the display panel of the present embodiment is not particularly limited as long as it is a display panel in which a display region is configured by pixels arranged in a matrix. Therefore, when the display panel of this embodiment is a liquid crystal display panel, the driving method may be a simple matrix type.

In the present embodiment, the parallax barrier panel is disposed on the display surface side of the display panel. However, in the case of a transmissive liquid crystal display device, the parallax barrier panel may be disposed on the rear side of the display panel. On the other hand, when the display device of the present embodiment is a self-luminous or reflective display device such as a reflective or transflective liquid crystal display device, PDP, organic EL display, FED, etc., a parallax barrier panel Needs to be arranged on the display surface side of the display panel.

(Embodiment 2)
Below, the display apparatus of Embodiment 2 is demonstrated. The display device of this embodiment is a dual view display using a transmissive liquid crystal display device having an inclined portion.

In addition, since the display apparatus of this embodiment differs only in the form of the display apparatus of Embodiment 1, and the form of a parallax barrier panel, description is abbreviate | omitted about the content which overlaps in Embodiment 1 and Embodiment 2. FIG. Moreover, in this embodiment, the same code | symbol was attached | subjected about the structural member similar to the liquid crystal display device of Embodiment 1. FIG.

FIG. 8 is a schematic diagram illustrating the display device according to the second embodiment, (a) is a schematic front view, and (b) is a schematic cross-sectional view taken along line X3-Y3 in (a).

As shown in FIG. 8, the display device 200 of the present embodiment has a structure in which a display panel 110, an adhesive layer 130, and a parallax barrier panel 220 similar to those of the first embodiment are stacked. In addition, the parallax barrier panel 220 includes an inclined portion 223 on the adhesive layer 130 side of the outside display area 160. Since the inclined portion 223 functions to store the adhesive, the display device 200 can effectively suppress the leakage of the adhesive as in the first embodiment. Thus, in this specification, the inclined portion is a portion whose cross-sectional shape formed at the substrate end of the display panel and / or the functional panel is substantially oblique. Here, the cross-sectional shape is a cross-sectional shape taken along line X3-Y3 in FIG. Further, the inclined portion is usually formed on the adhesive layer side of the display panel and / or the functional panel.

Regarding the form of the inclined portion, first, the arrangement location and the cross-sectional shape of the inclined portion will be further described below. FIG. 9 is a schematic cross-sectional view illustrating a modification of the display device according to the second embodiment. FIG. 10 is a schematic cross-sectional view of a display device according to comparative example 2. FIGS. 11A and 11B are schematic cross-sectional views showing another modification of the display device according to the second embodiment.

In the present invention, the inclined portion may be arranged in the outside display area. Therefore, the inclined portion 223 may be disposed outside the light shielding layer 115 as shown in FIG. On the other hand, as shown in FIG. 10, since the inclined portion 223 is formed so as to overlap the display area 160 inside the light shielding layer 115, the display quality around the inclined portion is remarkably lowered. Shall not be included.

Further, the cross-sectional shape of the inclined portion may be a substantially oblique shape. In addition to the substantially tapered shape shown in FIG. 8B, a substantially arc shape as shown in FIG. 11A, FIG. However, from the viewpoint of ease of processing, a substantially tapered shape is preferable. Here, the cross-sectional shape is a cross-sectional shape taken along line X3-Y3 in FIG.

Next, the planar shape of the inclined portion will be described. 12A and 12B are schematic front views showing another planar shape of the inclined portion in the display device according to the second embodiment.

As shown in FIG. 12A, the inclined portion 223 may be arranged so that the planar shape is a dot shape. However, as shown in FIG. 8A, the inclined portion 223 is preferably arranged so that the planar shape is substantially straight. As a result, the adhesive easily flows in the inclined portion 223 and spreads easily in the inclined portion 223, so that the occurrence of adhesive leakage can be more effectively suppressed.

Further, as shown in FIG. 12B, the inclined portion 223 may be arranged so that the planar shape is substantially a square shape. That is, the inclined portion 223 may be disposed on the entire outer periphery of the parallax barrier panel 220. However, it is preferable that the inclined portions 223 are arranged at the corners other than the four corners of the parallax barrier panel 220, and as shown in FIG. . Thereby, the alignment marks 124 can be arranged at the four corners (on the diagonal lines) of the parallax barrier panel 220. As a result, the horizontal positions of the parallax barrier panel 220 and the display panel 110 can be adjusted with higher accuracy in the same manner as in the first embodiment.

In addition, it does not specifically limit as a formation method of an inclination part, A physical method is mentioned. Examples of the physical method include chamfering with a glass shaving machine.

Here, how the inclined portion accumulates the adhesive will be briefly described. FIG. 13 is a schematic cross-sectional view of the display device according to the second embodiment in the pressurizing step, where (a) is a state before the parallax barrier panel is placed on the display panel, and (b) is parallax. In this state, the barrier panel is pressed against the display panel.

As shown in FIG. 13A, from the state before the parallax barrier panel 220 is placed on the display panel 110 to which the adhesive 131 is applied, as shown in FIG. By pressing 120 on the display panel 110, the adhesive 131 spreads to the outer peripheral side of the substrate and flows into the inclined portion 223.

As described above, the inclined portion functions as an adhesive reservoir that suppresses the spread of the adhesive. Therefore, the display device of this embodiment can effectively suppress the leakage of the adhesive. As a result, the display device of this embodiment can improve display quality and reliability in the same manner as in the first embodiment.

(Embodiment 3)
Below, the display apparatus of Embodiment 3 is demonstrated. The display device of the present embodiment is a bale view display having a groove.

Note that the display device according to the present embodiment is different from the display device according to the first embodiment only in the form of the function panel, and therefore, the description of the contents overlapping between the first embodiment and the third embodiment is omitted. Moreover, in this embodiment, the same code | symbol was attached | subjected about the structural member similar to the liquid crystal display device of Embodiment 1. FIG.

FIG. 14 is a schematic cross-sectional view illustrating the display device according to the third embodiment. As shown in FIG. 14, the display device 300 of the present embodiment includes a viewing angle variable panel 320 as a functional panel instead of the parallax barrier panel.

The viewing angle variable panel 320 is a functional panel for narrowing the viewing angle so that the display screen can be viewed only in a desired direction (usually the front direction of the display surface). More specifically, the viewing angle variable panel 320 is formed on a pair of substrates 321 and 322, a liquid crystal layer 313 sandwiched between the substrates 321 and 322, and a liquid crystal layer side of the substrates 321 and 322. It has a transparent electrode layer (not shown), an alignment film (not shown) formed on the surface of the substrates 321 and 322 on the liquid crystal layer side, and a sealing material 314 provided between the substrates 321 and 322.

On the other hand, the display panel 310 has the same configuration as the display panel 110 of the first embodiment, and can display a normal image. Thereby, the viewing angle variable panel 320 can electrically change the layer state of the liquid crystal layer 313 or the alignment direction of the liquid crystal molecules included in the liquid crystal layer 313. As a result, the display device 300 can switch between wide viewing angle display and narrow viewing angle display.

And the board | substrate 321 arrange | positioned at the adhesive layer 130 side of the viewing angle variable panel 320 has the groove part 123 formed in the adhesive layer 130 side along the outline similarly to Embodiment 1. FIG. Therefore, the display device 300 can effectively suppress the leakage of the adhesive as in the first embodiment. Thereby, also in the display device of the present embodiment in which the viewing angle variable panel is arranged as a functional panel, display quality and reliability can be improved as in the first embodiment.

Note that the substrate 112 on the adhesive layer 130 side (viewing angle variable panel 320 side) of the display panel 110 does not need to be thinned in the bail view display. Therefore, in this embodiment, the groove part 123 may be disposed on the adhesive layer 130 side of the display panel 110.

(Embodiment 4)
Below, the display apparatus of Embodiment 4 is demonstrated. The display device of the present embodiment is a 3D display having a groove.

Note that the display device according to the present embodiment is different from the display device according to the first embodiment only in the form of the functional panel, and therefore, the description of the contents overlapping between the first embodiment and the fourth embodiment is omitted. Moreover, in this embodiment, the same code | symbol was attached | subjected about the structural member similar to the liquid crystal display device of Embodiment 1. FIG.

FIG. 15 is a schematic cross-sectional view illustrating the display device according to the fourth embodiment. As shown in FIG. 15, the display device 400 of this embodiment includes a 2D / 3D variable panel 420 as a functional panel instead of the parallax barrier panel.

The 2D / 3D variable panel 420 is a functional panel for visually recognizing a planar image as a stereoscopic image. More specifically, the 2D / 3D variable panel 420 includes a pair of substrates 421 and 422, a liquid crystal layer 413 sandwiched between the substrates 421 and 422, and a common formed on the liquid crystal layer side of the substrate 422. An electrode (not shown), a pixel electrode (not shown) formed on the liquid crystal layer side of the substrate 421, an alignment film (not shown) formed on the surface of the substrates 421 and 422 on the liquid crystal layer side, A sealant 414 provided between the substrates 421 and 422; and polarizing plates 441 and 442 disposed on the outside of the substrates 421 and 422 (on the opposite side to the liquid crystal layer 413). Accordingly, the 2D / 3D variable panel 420 can electrically generate a barrier stripe having an arbitrary shape.

On the other hand, the display panel 110 has the same configuration as the display panel 110 of the first embodiment, and each pixel can display a right display image and a left display image corresponding to the barrier stripe. In the first embodiment, the polarizing plate 141 disposed on the display surface side of the parallax barrier panel 120 is disposed on the display surface side of the display panel 110 in the present embodiment. Thus, by stacking the 2D / 3D variable panel 420 and the display panel 110, the display device 400 can display a planar image and a stereoscopic image.

And the board | substrate 421 and the polarizing plate 442 arrange | positioned at the adhesive layer 130 side of the 2D / 3D variable panel 420 have the groove part 123 formed in the adhesive layer 130 side along the outline similarly to Embodiment 1. FIG. Have. Therefore, the display device 400 can effectively suppress the leakage of the adhesive as in the first embodiment. Thereby, also in the display device of this embodiment in which the 2D / 3D variable panel is arranged as a functional panel, display quality and reliability can be improved as in the first embodiment.

In addition, when forming a groove part by processing a member other than the substrate such as a polarizing plate and the substrate, the groove part may be processed and formed by a physical method such as dicing from the viewpoint of ease of processing. preferable.

In the present invention, the adhesive reservoir may be disposed on the surface of the display panel and / or the functional panel on the adhesive layer side, and the member processed to form the adhesive reservoir is not particularly limited. .

Therefore, when the groove portion is provided in the display panel and / or the functional panel to which the polarizing plate is attached as in the present embodiment, the groove portion 123 is not polarized as shown in FIG. It may be formed by processing the plate 442.

Further, the substrate 112 on the adhesive layer 130 side (2D / 3D variable panel 420 side) of the display panel 110 does not need to be thinned in the 3D display. Therefore, in this embodiment, the groove part 123 may be disposed on the adhesive layer 130 side of the display panel 110.

(Embodiment 5)
Below, the display apparatus of Embodiment 5 is demonstrated. The display device of this embodiment is a touch panel display using a transmissive liquid crystal display device having a groove.

Note that the display device according to the present embodiment is different from the display device according to the first embodiment only in the form of the function panel. Moreover, in this embodiment, the same code | symbol was attached | subjected about the structural member similar to the liquid crystal display device of Embodiment 1. FIG.

FIG. 17 is a schematic cross-sectional view illustrating the display device according to the fifth embodiment. As shown in FIG. 17, the display device 100 of this embodiment includes a touch panel 520 as a functional panel instead of the parallax barrier panel.

Touch panel 520 is a functional panel for enabling information input on the display screen. More specifically, the touch panel 520 is a resistive touch panel, and includes a substrate 511 on which a solid electrode (not shown) is formed, and a flexible substrate 512 on which a solid electrode (not shown) is formed. , And an adhesive 531 provided between the substrate 511 and the flexible substrate 512. On the other hand, the display panel 110 has the same configuration as that of the first embodiment, and can display a normal image. In the first embodiment, the polarizing plate 141 disposed on the display surface side of the viewing angle variable panel 120 is disposed on the rear side of the touch panel 520 in the fifth embodiment. As described above, by disposing the touch panel 520 on the display screen side of the display panel 110, the display device 500 can input information on the image display.

Note that the type of touch panel is not particularly limited, and may be an ultrasonic method using one substrate, a capacitive coupling method, an optical method, or the like.

And the board | substrate 511 and the polarizing plate 141 arrange | positioned at the adhesive bond layer 130 side of the touchscreen 520 have the groove part 123 arrange | positioned at the adhesive bond layer 130 side along the outline similarly to Embodiment 1. FIG. Therefore, the display device 500 can effectively suppress the leakage of the adhesive as in the first embodiment. Thereby, also in the display device of this embodiment in which a touch panel is arranged as a functional panel, display quality and reliability can be improved as in the first embodiment.

Note that the substrate 112 on the adhesive layer 130 side (touch panel 520 side) of the display panel 110 does not need to be thinned in the touch panel display. Therefore, in this embodiment, the groove part 123 may be disposed on the adhesive layer 130 side of the display panel 110.

The results of an evaluation test using an actually produced panel will be described below.

(Example 1)
The panel of Example 1 has the same configuration as the display device of Embodiment 1 shown in FIG. Therefore, first, an active matrix type liquid crystal display panel having a general configuration and a parallax barrier panel in which grooves are linearly formed on four sides as an adhesive reservoir are prepared. Glass substrates were used as the substrates 111, 112, and 121. The thickness of the substrates 111 and 121 was 0.7 mm, while the substrate 112 was thinned by glass etching to have a thickness of 0.05 mm.

FIG. 18 is a schematic cross-sectional view of a display device for explaining an arrangement form of an adhesive reservoir and a light shielding layer in each example and comparative example, and (a) is an arrangement form of a groove part in Examples 1 to 3. (B) is a figure explaining the arrangement | positioning form of the inclination part of Example 4, (a) is a figure explaining the arrangement | positioning form of the groove part of the comparative example 1, (d) () Is a figure explaining the arrangement | positioning form of the inclination part of the comparative example 2. FIG.

As shown in FIG. 18A, in Example 1, the width W1 of the groove 123 was 1.0 mm, and the depth d of the groove 123 was 0.30 mm. The light shielding layer 115 has a width W2 of 2.0 mm, and the groove 123 is formed in a region overlapping with the light shielding layer 115.

Next, as shown in FIG. 20A, an acrylic ultraviolet curable resin as an adhesive was applied onto the substrate 112 by a slit coater. Note that the adhesive was applied so as to be approximately the same size as the substantially rectangular region surrounded by the groove when the display panel and the parallax barrier panel were bonded together. Moreover, the thickness of the adhesive at the time of application and the viscosity at 25 ° C. were 100 μm and 1500 mPa · s, respectively.

Next, as shown in FIG. 20B, the parallax barrier panel was pressurized so that the thickness of the adhesive (panel spacing) was approximately 50 μm. Then, as shown in FIGS. 20C and 20D, in a state where the panel position is controlled by the chuck 672, an ultraviolet ray having a light amount of 1000 mJ is irradiated by an ultraviolet irradiator (metal halide lamp), and an ultraviolet curable resin is applied. Cured. As described above, the parallax barrier panel was fixed to the display panel, and the test panel of Example 1 (Sample 1) was completed.

(Example 2)
The test panel of Example 2 (Sample 2) was produced in the same manner as the panel of Example 1 except that the depth d of the groove 123 was 0.65 mm. Therefore, in this example, the thickness of the substrate where the groove portion of the parallax barrier panel was formed was 0.05 mm.

(Example 3)
The test panel of Example 3 (Sample 3) was produced in the same manner as the panel of Example 1 except that the width W1 of the groove 123 was 2.0 mm. Therefore, in this embodiment, the groove is formed so as to almost completely overlap the light shielding layer having a width of 2.0 mm.

Example 4
The test panel of Example 4 (Sample 4) is different from the panel of Example 1 only in the form of the adhesive reservoir, so that the description of the contents overlapping in Example 1 and Example 4 is omitted.

The test panel of Example 4 has an inclined portion 223 as shown in FIG. 8 instead of the groove as an adhesive reservoir. 18B, in Example 4, the width W3 of the inclined portion 223 was 2.0 mm, and the inclined portion 223 was formed in the outer region including the light shielding layer 115.

(Comparative Example 1)
The test panel of Comparative Example 1 (Comparative Sample 1) was formed so that the groove 123 was positioned 0.1 mm inside (display area side) from the light shielding layer 115 as shown in FIG. Other than that, it was produced in the same manner as the panel of Example 1.

(Comparative Example 2)
The test panel of Comparative Example 2 (Comparative Sample 2) was produced in the same manner as the panel of Example 4 except that the width W3 of the inclined portion 223 was set to 3.0 mm as shown in FIG. . Thereby, in this comparative example, a part of inclined part 223 is arrange | positioned inside the light shielding layer (display area side).

(Comparative Example 3)
The test panel of Comparative Example 3 (Comparative Sample 3) was produced in the same manner as the panel of Example 1 using a display panel and a parallax barrier panel that did not have a groove portion or an inclined portion as an adhesive reservoir.

(Leakage evaluation)
With respect to Samples 1 to 4 and Comparative Samples 1 to 3, the occurrence of leakage of the adhesive was visually observed immediately after the parallax barrier panels were bonded and at the time of alignment of the panel position by the chuck.

(Grade evaluation)
The display unevenness level was evaluated for samples 1 to 4 and comparative samples 1 to 3. FIG. 19 is a schematic perspective view showing an arrangement form of panels and polarizing plates in a quality evaluation test. As shown in FIG. 19, the quality evaluation is performed by lighting the backlight 170 in a state where the polarizing plate 141, the test panel 101, and the polarizing plate 142 are laminated on the backlight 170, and visually checking the outer peripheral portion of the display area. Display unevenness level was evaluated. Further, the polarizing plate 142 is arranged so that an angle formed by the absorption axis direction of the polarizing plate 141 and the absorption axis direction of the polarizing plate 141 is 45 °. At this time, variation in the cell thickness of the display panel appears as display unevenness.

Further, the quality evaluation was performed immediately after curing of the adhesive and after being kept in a dry atmosphere at 120 ° C. for 240 hours (after aging). Here, the display unevenness level was evaluated in five stages of S level, A level, B level, C level, and D level in order of excellent display quality. That is, the S level is a state in which there is no display unevenness, and the D level is the most remarkable level of display unevenness. From the viewpoint of practicality, the S level and A level are acceptable levels.

(Evaluation results)
Table 1 shows the results of the leakage evaluation test and the quality evaluation test.

As shown in Table 1, with respect to Samples 1 to 4 and Comparative Samples 1 to 3 having a groove portion or an inclined portion, no leakage of the adhesive occurred immediately after bonding and during alignment. On the other hand, the leakage of the adhesive occurred in the test panel of Comparative Example 3 having no adhesive reservoir. Therefore, it has been found that the groove and the inclined portion suppress the occurrence of leakage of the adhesive regardless of the size.

In addition, regarding the quality evaluation immediately after curing, Comparative Samples 1 and 2 in which the adhesive reservoir portion was formed on the inner side of the light shielding layer had a display quality of a practical level or less. This is considered to be caused by a difference in shrinkage due to curing between the adhesive layer (peripheral adhesive layer) in the adhesive reservoir and the other adhesive layer (central adhesive layer) in the vicinity of the center. That is, since the peripheral adhesive layer is thicker than the central adhesive layer, the shrinkage due to curing is larger than that of the central adhesive layer. Then, after the adhesive is cured, an internal stress is generated in the adhesive layer, and the substrate of the display panel is distorted due to the stress. As a result, the cell thickness of the display panel is changed, and it is considered that display unevenness occurs around the groove.

On the other hand, Samples 1 to 4 showed very good display quality. The cause is considered as follows. That is, in Samples 1 to 4, the adhesive reservoir is disposed overlapping the light shielding layer. Therefore, even if the display panel substrate is distorted in the vicinity of the adhesive reservoir, it is considered that the distortion is not visually recognized as display unevenness because it is located in the non-display area.

Moreover, although the comparative sample 3 which does not have an adhesive reservoir part showed the display quality of the practical use level, the display quality was inferior compared with the samples 1-4. This is because, in the comparative sample 3, the leakage of the adhesive is significant, and the degree of cure shrinkage is greatly different between the leaked portion and the non-leaked portion of the adhesive layer. As a result, the substrate generated near the outer periphery of the display panel This is considered to be due to the fact that the distortion of the image affected the display area.

Furthermore, regarding the quality evaluation after aging, it was found that the display unevenness level deteriorated in each of the examples and comparative examples. This is considered to be because the adhesive layer hardens with aging and the elasticity of the adhesive layer is lost, so that the internal stress distorts the display panel substrate more significantly. However, Samples 1, 3, and 4 maintained a display quality at a practical level even after aging.

In Sample 2, cracking occurred in the parallax barrier panel near the groove after aging. This is presumably because the thickness of the substrate in the portion of the sample 2 where the groove was formed was as thin as 0.05 mm and could not withstand the internal stress. Thereby, it turns out that it is preferable to set the thickness of a groove part in the range in which the thickness of the board | substrate with which the groove part was formed becomes larger than 0.05 mm.

It is a schematic diagram which shows the display apparatus of Embodiment 1, (a) is a front schematic diagram, (b) is a cross-sectional schematic diagram in the X1-Y1 line | wire of (a). (A) And (b) is a cross-sectional schematic diagram which shows the deformation | transformation form of the display apparatus of Embodiment 1. FIG. It is a cross-sectional schematic diagram of the display apparatus of the comparative form 1. (A) And (b) is a cross-sectional schematic diagram which shows another modification of the display apparatus of Embodiment 1. FIG. (A)-(c) is a front schematic diagram which shows another planar shape of the groove part in the display apparatus of Embodiment 1. FIG. (A) is an expansion schematic diagram of the area | region enclosed with the dashed-two dotted line in Fig.1 (a), (b) is a cross-sectional schematic diagram in the X2-Y2 line | wire in Fig.6 (a). The cross-sectional schematic diagram of the display apparatus of Embodiment 1 in a pressurization process is shown, (a) is a state before mounting a parallax barrier panel on a display panel, (b) is a parallax barrier panel displaying. The panel is under pressure. It is a schematic diagram which shows the display apparatus of Embodiment 2, (a) is a front schematic diagram, (b) is a cross-sectional schematic diagram in the X3-Y3 line | wire of (a). FIG. 10 is a schematic cross-sectional view illustrating a modification of the display device according to the second embodiment. It is a cross-sectional schematic diagram of the display apparatus of the comparative form 2. (A) And (b) is a cross-sectional schematic diagram which shows another modification of the display apparatus of Embodiment 2. FIG. (A) And (b) is a front schematic diagram which shows another planar shape of the inclination part in the display apparatus of Embodiment 2. FIG. The cross-sectional schematic diagram of the display apparatus of Embodiment 2 in a pressurization process is shown, (a) is a state before a parallax barrier panel is mounted on a display panel, (b) is a parallax barrier panel displaying. The panel is under pressure. 10 is a schematic cross-sectional view showing a display device of Embodiment 3. FIG. 6 is a schematic cross-sectional view showing a display device of Embodiment 4. FIG. FIG. 10 is a schematic cross-sectional view illustrating a modification of the display device according to the fourth embodiment. 10 is a schematic cross-sectional view showing a display device of Embodiment 5. FIG. It is a cross-sectional schematic diagram of the display apparatus for demonstrating the arrangement | positioning form of the adhesive reservoir part and light shielding layer in each Example and a comparative example, (a) is a figure explaining the arrangement | positioning form of the groove part of Examples 1-3. (B) is a figure explaining the arrangement | positioning form of the inclination part of Example 4, (a) is a figure explaining the arrangement | positioning form of the groove part of the comparative example 1, (d) is a comparison. It is a figure explaining the arrangement | positioning form of the inclination part of Example 2. FIG. It is a perspective schematic diagram which shows the arrangement | positioning form of the panel and polarizing plate in a quality evaluation test. (A)-(d) is a perspective schematic diagram of the display panel and function panel for demonstrating the manufacturing process (whole surface adhesion process) with the conventional display apparatus and the display apparatus of this invention. It is a cross-sectional schematic diagram of a conventional display device, (a) shows the state immediately after bonding the display panel and the functional panel, (b) shows the state during the pressurizing step. It is a cross-sectional schematic diagram of a conventional display device, (a) shows the state immediately after bonding the display panel and the functional panel, (b) shows the state during the alignment step.

Explanation of symbols

100, 200, 300, 400, 500: Display device 101: Test panel 110, 610: Display panel 111, 112, 121, 321, 322, 421, 422, 511: Substrate 113, 313: Liquid crystal layer 114, 314, 414: Sealing material 115: Light shielding layer 116: Opening 117: Driver 120, 220: Parallax barrier panel (functional panel)
122: Parallax barrier 123: Groove (region surrounded by a dotted line in FIGS. 1A, 5 and 6A)
124: Alignment mark 130: Adhesive layers 131, 631: Adhesives 141, 142, 441, 442: Polarizing plate 150: Display area 160: Non-display area 170: Backlight 223: Inclined portion (FIG. 8A and FIG. (Area surrounded by a dotted line in 12)
320: Variable viewing angle panel (functional panel)
420: 2D / 3D variable panel (functional panel)
512: Flexible substrate 520: Touch panel (functional panel)
531: Adhesive 620: Function panel 671: Slit coater 672: Chuck 673: Light

Claims (9)

A display device having a structure in which a display panel and a functional panel are laminated,
The display device has an adhesive layer between the display panel and the functional panel in the display area,
The display panel and / or the functional panel has an adhesive reservoir in a non-display area. The display device according to claim 1, wherein the adhesive reservoir is a groove. The display device according to claim 2, wherein the groove portion has a depth such that a thickness of the panel constituting substrate in a portion where the groove portion is formed is larger than 50 μm. The display device according to claim 1, wherein the adhesive reservoir is an inclined portion. The display device according to claim 1, wherein the adhesive reservoir is disposed outside a light shielding layer provided on an outer periphery of the display panel. The display device according to claim 1, wherein the adhesive reservoir has a substantially straight planar shape. 2. The display device according to claim 1, wherein the adhesive reservoir is disposed at a position other than the four corners of the display panel and / or the functional panel having a substantially square planar shape. The display device according to claim 1, wherein the adhesive layer includes a photocurable resin. The display device according to claim 1, wherein the functional panel is a parallax barrier panel or a 2D / 3D variable panel.

Images