WO2011043440A1 - 液晶表示装置およびその製造方法 - Google Patents
液晶表示装置およびその製造方法 Download PDFInfo
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- WO2011043440A1 WO2011043440A1 PCT/JP2010/067688 JP2010067688W WO2011043440A1 WO 2011043440 A1 WO2011043440 A1 WO 2011043440A1 JP 2010067688 W JP2010067688 W JP 2010067688W WO 2011043440 A1 WO2011043440 A1 WO 2011043440A1
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- active matrix
- liquid crystal
- matrix substrate
- substrate
- preventing member
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Definitions
- the present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a structure in which an active matrix substrate and a counter substrate are bonded together and liquid crystal is sealed therebetween, and a manufacturing method thereof.
- a so-called active matrix type liquid crystal display device having a structure in which an active matrix substrate and a counter substrate are bonded together and liquid crystal is sealed between the substrates has been widely used.
- semiconductor elements functioning as liquid crystal drive elements for example, thin film transistors abbreviated as TFTs
- wirings for controlling the semiconductor elements are formed on the active matrix substrate.
- a color filter or the like is formed on the counter substrate as necessary, and a common electrode is formed on the entire surface.
- a silver paste is provided between the active matrix substrate and the counter substrate (for example, refer to Patent Document 1), and (2) the active matrix substrate and the counter substrate are provided. It is known that a conductive bead is contained in a sealing material used when adhering (see, for example, Patent Document 2).
- the alignment film in the pixel region of the active matrix substrate is also extended on the wiring and electrode pattern outside the pixel region.
- the alignment film is generally very thin, about 100 nm, and pressure is applied.
- an object of the present invention is to provide a liquid crystal display device in which an active matrix substrate and a counter substrate are bonded to each other, and the liquid crystal display device is less likely to cause a short circuit between the substrates.
- a liquid crystal display device includes a pixel region in which a plurality of pixel electrodes are formed, a peripheral region located outside the pixel region, and an active matrix substrate and a counter substrate having a common electrode.
- the active matrix substrate includes a first wiring extending to the peripheral region, a first insulating layer formed on the first wiring, and extending on the insulating layer in the peripheral region.
- a conduction preventing member for preventing is arranged
- the method for manufacturing a liquid crystal display device includes a pixel region in which a plurality of pixel electrodes are formed and a peripheral region located outside the pixel region, and an active matrix substrate and a counter electrode having a common electrode.
- a method of manufacturing a liquid crystal display device comprising a substrate, wherein a first wiring extending to the peripheral region is formed on the active matrix substrate, and a first wiring is formed on the first wiring of the active matrix substrate.
- a step of forming an electrode film for electrically connecting a line and the second wiring; a step of forming a common electrode on the counter substrate; and the electrode film and the electrode on one of the active matrix substrate and the counter substrate A step of forming a conduction preventing member that prevents conduction with the common electrode, and at least a part of the electrode film overlaps the conduction preventing member when viewed from the normal direction of the substrate surface of the active matrix substrate. And bonding the active matrix substrate and the counter substrate with a sealing material.
- the present invention it is possible to provide a liquid crystal display device in which an active matrix substrate and a counter substrate are bonded to each other, and a liquid crystal display device in which a short circuit between the substrates hardly occurs.
- FIG. 2 is an enlarged plan view showing the vicinity of a region A indicated by a broken line in FIG. 1 in the liquid crystal display device according to the first embodiment.
- FIG. 3 is a cross-sectional view taken along line BB shown in FIG.
- FIG. 5 is a cross-sectional view taken along line BB shown in FIG.
- FIG. 5 is a sectional view taken along line CC shown in FIG. 4.
- 6 is a cross-sectional view illustrating a schematic configuration of a first modification of the liquid crystal module 101.
- FIG. 6 is a cross-sectional view illustrating a schematic configuration of a second modification of the liquid crystal module 101.
- FIG. 10 is a cross-sectional view illustrating a schematic configuration of a third modification of the liquid crystal module 101.
- FIG. 10 is a cross-sectional view illustrating a schematic configuration of a fourth modification of the liquid crystal module 101.
- FIG. 10 is a cross-sectional view illustrating a schematic configuration of a fifth modification of the liquid crystal module 101.
- FIG. 10 is a cross-sectional view illustrating a schematic configuration of a sixth modification of the liquid crystal module 101.
- FIG. It is sectional drawing which showed the structure of the conduction
- FIG. 2 illustrates a configuration of a DD cross section (a cross sectional configuration of a pixel) illustrated in FIG. 1.
- FIG. 2 is a cross-sectional view taken along line DD shown in FIG. 1 and shows a configuration in which an alignment control structure is formed in a pixel region.
- 4 is a plan view schematically showing the configuration of a TFT 30 and a contact portion 63 in the vicinity thereof in the gate driver 4a.
- a liquid crystal display includes a pixel region in which a plurality of pixel electrodes are formed, a peripheral region located outside the pixel region, an active matrix substrate, a counter substrate having a common electrode,
- the active matrix substrate includes: a first wiring extending to the peripheral region; a first insulating layer formed on the first wiring; and the insulating layer in the peripheral region.
- a second wiring extending upward; a second insulating layer formed on the second wiring; and disposed in a through hole formed in the first insulating layer and the second insulating layer in the peripheral region.
- the sealing material to be bonded to the counter substrate and the active matrix substrate, when viewed from the normal direction of the substrate surface, are arranged at a position at least partially overlapping with the electrode film, and the electrode film and the common electrode are electrically connected And a conduction preventing member for preventing the movement.
- the first wiring and the second wiring are connected through the through hole by the electrode film in the peripheral region outside the pixel region of the active matrix substrate. Further, in addition to the sealing material for bonding the active matrix substrate and the counter substrate between the active matrix substrate and the counter substrate in the peripheral region, the active matrix substrate is viewed from the normal direction of the substrate surface.
- a conduction preventing member is provided that is provided at a position at least partially overlapping with the electrode film and prevents the electrode film and the common electrode of the counter substrate from conducting.
- the conduction preventing member may be in contact with both the electrode film and the common electrode, or may be in contact with only one of the electrode film and the common electrode. According to the former aspect, there is less room for any conductive material to enter between the conduction preventing member and the electrode film or the common electrode, and a short circuit between the substrates can be prevented more reliably. Further, the conduction preventing member also serves as a spacer outside the pixel region, and the distance between the active matrix substrate and the counter substrate can be maintained even outside the pixel region.
- the height of the conduction preventing member is smaller than the cell gap, when something enters between the conduction preventing member and the electrode film or the common electrode facing the conduction preventing member, the location There is an advantage that the increase in the thickness of the substrate is small.
- the conduction preventing member has an end face that faces the active matrix substrate without being in contact with the active matrix substrate, and the end face of the conduction preventing member is formed with unevenness.
- the entering substance is absorbed into the gap of the recess, so that the thickness of the substrate at that location.
- the drive circuit disposed on the active matrix substrate in the peripheral region, the active matrix substrate disposed between the active matrix substrate and the counter substrate in the peripheral region, and the active matrix substrate
- a second conduction preventing member disposed at a position overlapping the drive circuit.
- the second conduction preventing member can suppress a short circuit between the wiring in the drive circuit and the electrode of the counter substrate.
- the second conduction preventing member is black, and when viewed from the normal direction of the substrate surface of the active matrix substrate, the channel region of the drive circuit and the second conduction preventing member are at least More preferably, the portions are arranged so as to overlap each other.
- the conduction preventing member functions as a light-shielding layer for the drive element in the drive circuit, and can suppress deterioration in characteristics of the drive element.
- the liquid crystal display device further includes a protruding structure provided between the active matrix substrate and the counter substrate in a pixel region, and the conduction preventing member is formed of the same material as the protruding structure. It is preferable that According to this configuration, since the conduction preventing member and the protruding structure can be formed from the same material, the manufacturing process can be simplified. Moreover, it is also preferable that the protruding structure is a spacer that defines a distance between the active matrix substrate and the counter substrate. Alternatively, it is also preferable that the protruding structure is an alignment control structure that defines the alignment state of the liquid crystal. At this time, it is preferable that the protruding structure and the conduction preventing member are provided in the same layer in the active matrix substrate. That is, the active matrix substrate is formed by sequentially laminating various layers made of metal, resin, or the like on a translucent substrate such as a glass substrate, for example. These laminated structures are preferably provided in the same layer.
- the sealing material may include a conductive granular material, and may be disposed between the electrode film and the common electrode of the counter substrate. According to this configuration, since the conduction preventing member prevents the conductive granular material from entering between the electrode film of the active matrix substrate and the common electrode of the counter substrate, the short circuit between the substrates can be effectively suppressed. Can do.
- a step portion is formed on the surface of the second insulating layer in the through hole, and an end portion of the electrode film is located on the step portion. According to this configuration, a sufficient distance between the electrode film and the common electrode of the counter substrate can be secured. Thereby, there is an advantage that a short circuit between the electrode film of the active matrix substrate and the common electrode of the counter substrate can be prevented more reliably.
- a method for manufacturing a liquid crystal display device includes a pixel region in which a plurality of pixel electrodes are formed, a peripheral region located outside the pixel region, an active matrix substrate, and a common electrode.
- steps (a) to (i) do not need to be executed in alphabetical order.
- the conduction preventing member prevents the electrode film and the common electrode of the counter substrate from conducting, so that when pressure is applied from the outside of the substrate, the active matrix substrate When some kind of conductive material is interposed between the electrode film and the common electrode of the counter substrate, it is possible to effectively suppress a short circuit between the substrates due to these.
- a liquid crystal display device in which an active matrix substrate and a counter substrate are bonded to each other, and a liquid crystal display device that does not easily cause a short circuit between the substrates is realized.
- the above method may further include a step of forming a projecting structure in a pixel region in at least one of the active matrix substrate and the counter substrate.
- the material of the conduction preventing member and the material of the protruding structure are the same, and the step of forming the protruding structure and the step of forming the conduction blocking member are performed simultaneously. According to this method, since the conduction preventing member is formed of the same material as the protruding structure in the pixel region and is formed at the same time as the protruding structure, there is an advantage that the manufacturing process can be prevented from becoming complicated. is there.
- FIG. 1 is a plan view schematically showing a schematic configuration of a liquid crystal module (liquid crystal display device) according to a first embodiment of the present invention.
- the liquid crystal module 100 of the first embodiment includes an active matrix substrate 1 and a counter substrate 2.
- the active matrix substrate 1 and the counter substrate 2 are bonded to each other with a sealing material (not shown) while maintaining a predetermined interval by a photo spacer (projection structure) provided in the pixel region.
- Liquid crystal is sealed in a space formed by the active matrix substrate 1, the counter substrate 2, and the sealing material.
- the active matrix substrate 1 includes a pixel region 3 in which pixel electrodes 43 are arranged in a matrix, and gate drivers 4a disposed on both sides of the pixel region 3 (in the horizontal direction (longitudinal direction) in the example shown in FIG. 1). 4b.
- the source line 5 and the gate line 6 are arranged so as to be orthogonal to each other.
- a thin film transistor (TFT) 7 is formed near the intersection of the source wiring 5 and the gate wiring 6.
- the gate drivers 4a and 4b have switching elements (TFT 30 shown in FIG. 3) that are formed simultaneously with the manufacturing process of the TFT 7 in the pixel region 3. . That is, the gate drivers 4 a and 4 b are monolithically formed on the active matrix substrate 1.
- the TFT 7 has a gate electrode connected to the gate wiring 6, a source electrode connected to the source wiring 5, and a drain electrode connected to the pixel electrode 43. Then, a gate signal is applied from the gate drivers 4a and 4b to the gate electrode of the TFT 7 via the gate wiring 6, whereby the ON / OFF of the TFT 7 is controlled. A data signal is applied to the source electrode of the TFT 7 from a source driver (not shown) via the source wiring 5.
- the active matrix substrate 1 is formed so that the length of the short side is larger than the length of the short side of the counter substrate 2.
- a terminal region 8 for inputting / outputting various signals between the active matrix substrate 1 and an external circuit is formed at a portion of the active matrix substrate 1 that is not covered by the counter substrate 2.
- each of the source lines 5 is connected to a source driver (not shown) provided outside the active matrix substrate 1 via a source driver connection terminal formed in the terminal region 8.
- the terminals in the terminal region 8 are omitted, but one or two or more terminals may be formed in the terminal region 8.
- the main wiring 14 is routed outside the gate drivers 4a and 4b (outside of the substrate).
- FIG. 1 shows an example of the form of the main wiring 14, and other forms in which the number of main wirings are different can be adopted.
- the main wiring 14 is connected to the terminals in the terminal region 8.
- the main wiring 14 is formed simultaneously with the source wiring 5 or the gate wiring 6 by using the same material as the source wiring 5 or the gate wiring 6 in the pixel region 3.
- the sealing material is laid outside the gate driver 4a (on the outer peripheral side of the substrate) so as to cover one or several of the main wirings 14.
- An area where the gate drivers 4a and 4b, the main wiring 14, the terminal area 8, and the like are located outside the pixel area is referred to as a peripheral area in this specification.
- FIG. 2 is an enlarged plan view showing the vicinity of the area A indicated by a broken line in FIG.
- a plurality of main wirings 14a to 14d are arranged outside the gate driver 4a (outside of the substrate).
- a contact portion 42 is provided on the main line 14 c with the gate line 12 connected to the gate driver 4 a (a line for supplying power supply voltage and signals to the gate driver 4 a: a first line). Yes.
- FIG. 3 is a cross-sectional view taken along the line BB shown in FIG. 2 and shows a cross-sectional structure of the contact portion 42.
- FIG. 3 shows a simplified cross-sectional structure of the contact portion 42.
- the main wiring 14 preferably has a laminated structure of a plurality of types of metal layers, but is omitted from FIG. 3 as a single metal layer.
- illustration of a passivation film or the like is omitted.
- the flatness of the various films shown in FIG. 3 and the dimensional ratios of the constituent members do not necessarily represent actual modes.
- the liquid crystal module 100 of this embodiment has a configuration in which the active matrix substrate 1 and the counter substrate 2 are bonded together with a sealing material 40, and the liquid crystal 34 is sealed in the gap.
- the distance between the active matrix substrate 1 and the counter substrate 2 is kept constant by columnar or wall-like photo spacers (projecting structures) provided in the pixel region 3 and having a uniform height.
- the photo spacer is formed of resin or the like so as to overlap the source wiring 5 or the gate wiring 6 while avoiding the opening of the pixel. A detailed example of the photospacer will be described later with reference to FIG.
- the sealing material 40 As the material of the sealing material 40, a thermosetting resin can be used. It is preferable that the sealing material 40 has photocurability. This is because, after the active matrix substrate 1 and the counter substrate 2 are positioned and bonded together, the sealing material 40 is temporarily cured by exposure to light, and the sealing material 40 can be fully cured by further heating. As the resin having such characteristics, a mixed resin of an epoxy resin and an acrylic resin can be used. A photo-curing resin may be used for the sealing material 40.
- the active matrix substrate 1 includes a glass substrate 11 and a gate wiring 12 (first wiring) formed on the surface of the glass substrate 11.
- the gate wiring 12 is connected to the gate electrode of the TFT 30 in the gate driver 4a.
- the gate wiring 12 is formed at the same time as the gate wiring 6 by the process of forming the gate wiring 6 with the same material as the gate wiring 6 in the pixel region 3.
- the gate wirings 6 and 12 preferably have, for example, a three-layer structure of a titanium layer, an aluminum layer, and a titanium layer.
- the gate wirings 6 and 12 are not limited to this, and may be a single-layer metal layer or a metal having two or four layers or more. It may be a layer.
- the gate wiring 12 is covered with an interlayer insulating film 13 (first insulating layer).
- the interlayer insulating film 13 is also referred to as a gate insulating film, and for example, a silicon nitride film can be preferably used.
- a main wiring 14 (14 a to 14 c: second wiring) is provided on the interlayer insulating film 13.
- the main wirings 14 a to 14 c are formed simultaneously with the source wiring 5 by the process of forming the source wiring 5 by using the same material as the source wiring 5 in the pixel region 3.
- the source wiring 5 and the main wirings 14a to 14c preferably have a two-layer structure in which an aluminum layer is stacked on a titanium layer.
- the present invention is not limited to this, and a single-layer metal layer or a metal having three or more layers may be used. It may be a layer. Further, for example, molybdenum or the like can be used instead of aluminum.
- the main wiring 14d of the active matrix substrate 1 is electrically connected to a common electrode (described later) of the counter substrate 2 through a silver paste (not shown) provided at an appropriate location. Has been.
- An interlayer insulating film 18 (second insulating layer) is provided on the main wiring 14 and the TFT 30.
- a pixel electrode 43 made of a transparent electrode film such as indium tin oxide (ITO) and an alignment film (not shown) for controlling the alignment of the liquid crystal 34 are formed on the surface of the interlayer insulating film 18.
- ITO indium tin oxide
- an alignment film (not shown) for controlling the alignment of the liquid crystal 34 are formed on the surface of the interlayer insulating film 18.
- the counter substrate 2 includes a color filter (not shown in FIG. 3) disposed on the glass substrate 21, and further includes an overcoat film 22 that covers the color filter, and a transparent electrode film 23.
- the electrode film 23 covers the entire surface of the counter substrate 2 and functions as a common electrode.
- an alignment film (not shown) for controlling the alignment of the liquid crystal 34 is provided on the surface of the electrode film 23 of the counter substrate 2.
- a light shielding layer (black matrix) 24 is provided in a region facing the gate driver 4 a in order to prevent the characteristics of the TFT 30 in the gate driver 4 a from being deteriorated by light.
- a through hole (contact hole) 20 that penetrates the interlayer insulating film 18 and the interlayer insulating film 13 on the main wiring 14 c is provided, and the through hole 20 and the electrode film 19 are provided.
- the main line 14c and the gate line 12 are electrically connected via the. That is, the electrode film 19 is exposed on the interlayer insulating film 18 in the contact portion 42, on the interlayer insulating film 13, the main wiring 14 c, and the interlayer insulating film 18 in the through hole 20, and on the bottom of the through hole 20. It is continuously stacked on the gate wiring 12.
- the electrode film 19 shown in FIG. 3 is formed simultaneously with the pixel electrode 43 by using the same material (for example, ITO) as the pixel electrode 43 in the pixel region 3.
- the component denoted by reference numeral 27 is a lower semiconductor layer
- the component denoted by reference numeral 28 is an upper semiconductor layer.
- the lower semiconductor layer 27 and the upper semiconductor layer 28 can be formed simultaneously with the formation of the semiconductor layer of the TFT 30, for example.
- the electrode film 19 is also formed on the wall surfaces of these layers.
- the conduction preventing member 31 a made of an insulating resin is formed on the electrode film 23 of the counter substrate 2, and the inside of the contact portion 42 (the side close to the TFT 30). ) Is formed with a conductive blocking member 31b.
- the reference numerals 31a and 31b are used.
- the reference numerals are used.
- the conduction preventing member 31 is a separate structure from the sealing material 40.
- An alignment film (not shown) extending from the pixel region 3 may be interposed between the electrode film 23 and the conduction preventing member 31.
- the conduction preventing member 31 is arranged such that at least a part thereof overlaps the electrode film 19 of the active matrix substrate 1 in the normal direction of the substrate surface (direction perpendicular to the substrate surface) (when viewed from the normal direction of the substrate surface). Must be provided.
- the conduction preventing member 31 a is provided so as to overlap the entire electrode film 19 in the normal direction of the substrate surface, and the conduction preventing member 31 b is provided at a position not overlapping the electrode film 19. Yes.
- the conduction preventing member 31b in a position not overlapping with the electrode film 19 may not be provided, and the conduction preventing member 31a does not necessarily overlap the entire electrode film 19.
- the conduction preventing member 31 is formed in a columnar shape or a wall shape by using the same material as a protruding structure (here, a photo spacer) provided in the pixel region 3.
- the conduction preventing member 31 and the photo spacer can be simultaneously formed by a photolithography process using, for example, a transparent photosensitive acrylic resin as a material.
- the end surface on the active matrix substrate 1 side of the conduction preventing member 31a has a width and a length sufficient to cover at least the electrode film 19 of the contact portion.
- the conduction preventing member 31a is provided so as to protrude from the surface of the electrode film 23 of the counter substrate 2, and when the active matrix substrate 1 and the counter substrate 2 are bonded together, There is no gap between them. This prevents the electrode film 19 of the active matrix substrate 1 from contacting the common electrode (electrode film 23) of the counter substrate 2 even when pressure is applied to the substrate. Therefore, according to this configuration, it is possible to prevent the active matrix substrate 1 and the counter substrate 2 from being short-circuited at the contact portion 42.
- the conduction preventing member 31 has an effect of performing the same function as a photo spacer that defines a cell gap in the pixel region 3. Therefore, when the conduction preventing member 31 is formed of the same material as that of the photospacer that defines the cell gap, the conduction preventing member 31b is provided at a location other than the contact portion 42 outside the pixel region 3 as shown in FIG. A configuration is preferable. According to this configuration, it is possible to obtain an effect that the conduction preventing member 31b keeps the distance between the active matrix substrate 1 and the counter substrate 2 outside the pixel region 3 uniform.
- the conduction preventing member 31 is preferably formed at the same time as the photo spacer by the same material as the photo spacer for keeping the active matrix substrate 1 and the counter substrate 2 at a predetermined interval in the pixel region 3. In this case, there is an advantage that the conduction preventing member 31 can be formed without increasing the number of manufacturing steps.
- the protruding structure provided in the pixel region 3 may have an alignment control structure that defines the alignment state of the liquid crystal in addition to the photo spacer that defines the substrate interval.
- the alignment control structure is used in, for example, a vertical alignment type liquid crystal module, and is generally formed in a wall shape having a predetermined height using a transparent resin. A detailed example of the orientation control structure will be described later with reference to FIG.
- the conduction preventing member 31 is formed of the same material as the alignment control material, not a photo spacer that defines the substrate interval. It is also possible.
- the conduction preventing member 31 may be formed of a material different from that of the photo spacer, or may be formed in a step different from that of the photo spacer. Further, the conduction preventing member 31 may be formed of a material different from that of the alignment control structure, or may be formed in a process different from that of the alignment control structure.
- the electrode film 19 outside the pixel region 3 of the active matrix substrate 1 is at least partially overlapped in the normal direction of the substrate surface.
- a conduction preventing member 31 is provided on the common electrode (electrode film 23) of the counter substrate 2. This prevents the electrode film 19 of the active matrix substrate 1 and the electrode film 23 of the counter substrate 2 from contacting each other even when pressure is applied to the substrate outside the pixel region 3. As a result, it is possible to prevent the active matrix substrate 1 and the counter substrate 2 from being short-circuited at the contact portion 42.
- FIG. 4 is an enlarged plan view showing the vicinity of a region corresponding to the region A indicated by a broken line in FIG. 1 in the liquid crystal display device (liquid crystal module) 101 according to the second embodiment.
- the overall configuration of the liquid crystal display device 101 is basically the same as that of the liquid crystal display device 100 shown in FIG.
- a conductive portion 41 is provided on the main wiring 14 d to connect the active matrix substrate 1 and the counter substrate 2.
- the sealing material 40 includes a conductive granular material (described later), and the sealing material 40 is disposed in the conduction portion 41, whereby the conductive granular material is interposed.
- the active matrix substrate 1 and the counter substrate 2 are electrically connected. Therefore, the silver paste which the structure concerning 1st Embodiment has becomes unnecessary, and there exists an advantage that the area of a frame area
- the conductive portion 41 may also be provided on the frame portion near the terminal region 8 or on the frame portion on the opposite side to the terminal region 8 on the main wiring 14 d. Further, as in the first embodiment, a contact portion 42 with the gate wiring 12 connected to the gate driver 4a is provided on the main wiring 14c.
- FIG. 5 is a cross-sectional view taken along line BB shown in FIG. 6 is a cross-sectional view taken along the line CC shown in FIG. 5 and 6 show a simplified cross-sectional structure of the conductive portion 41 and the contact portion 42.
- the main wiring 14 preferably has a laminated structure of a plurality of types of metal layers, but is omitted from FIGS. 5 and 6 as a single metal layer.
- a passivation film or the like is not shown.
- the flatness of the various films shown in FIGS. 5 and 6, the dimensional ratio of the constituent members, and the like do not necessarily represent actual aspects.
- the active matrix substrate 1 and the counter substrate 2 are bonded together with a sealing material 40, and the liquid crystal 34 is sealed in the gap. It is a configuration.
- the distance between the active matrix substrate 1 and the counter substrate 2 is kept constant by a photo spacer (projection structure) provided in the pixel region 3.
- a photo spacer projection structure
- the sealing material 40 is obtained by containing the conductive granular material 32 in a thermosetting resin 33 as a base material.
- the thermosetting resin 33 preferably has both photocurability. This is because, after the active matrix substrate 1 and the counter substrate 2 are positioned and bonded together, the sealing material 40 is temporarily cured by exposure to light, and the sealing material 40 can be fully cured by further heating.
- a mixed resin of an epoxy resin and an acrylic resin can be used.
- a transparent resin may be used, but it may be preferable to use a black resin as described in a later modification (fifth modification).
- the conductive granular material 32 is obtained, for example, by applying conductive metal plating (for example, gold plating) to plastic beads.
- the conductive granule 32 is substantially spherical before being mixed into the thermosetting resin 33, but is not damaged and is somewhat crushed in the bonding process between the active matrix substrate 1 and the counter substrate 2. It is preferable to have the following plasticity. Further, it is also preferable to use a thermoplastic resin such as an epoxy resin as the plastic bead serving as the core of the conductive granular material 32. This is because the conductive granular material 32 can be interposed between the active matrix substrate 1 and the counter substrate 2 without damaging the conductive granular material 32 in the main curing step in bonding the active matrix substrate 1 and the counter substrate 2 together. It is.
- the shape of the conductive granule 32 is not limited to a substantially spherical shape, but may be an oval shape (a cross section is substantially an ellipse) or a cylindrical shape.
- the conductive granular material 32 may be a granular material having a square shape, a polygonal shape, or a complicated irregular shape.
- the main wiring 14 (14 a to 14 c) is provided on the interlayer insulating film 13.
- the main wirings 14 a to 14 c are formed simultaneously with the source wiring 5 by the process of forming the source wiring 5 by using the same material as the source wiring 5 in the pixel region 3.
- the main wiring 14 d is formed simultaneously with the gate wiring 6 by a process of forming the gate wiring 6 under the interlayer insulating film 13 with the same material as the gate wiring 6 in the pixel region 3.
- a through hole (contact hole) 20 is provided in the interlayer insulating film 13 and the interlayer insulating film 18 on the main wiring 14 d, and through this through hole 20,
- the main wiring 14d and the electrode film 19 on the interlayer insulating film 18 are electrically connected. That is, the electrode film 19 is continuously formed on the interlayer insulating film 18 in the conductive portion 41, on the wall surfaces of the interlayer insulating films 13 and 18 in the through hole 20, and on the main wiring 14 d exposed at the bottom of the through hole 20.
- the electrode film 19 is continuously formed on the interlayer insulating film 18 in the conductive portion 41, on the wall surfaces of the interlayer insulating films 13 and 18 in the through hole 20, and on the main wiring 14 d exposed at the bottom of the through hole 20.
- the sealing material 40 is provided at a position covering the main wirings 14a to 14d or above a part or all of the main wirings 14a to 14d.
- the electrode film 19 of the conduction part 41 is electrically connected to the electrode film 23 of the counter substrate 2 by the conductive granular material 32 in the sealing material 40.
- a signal input from the terminal in the terminal region 8 to the main wiring 14 d is supplied to the common electrode of the counter substrate 2 through the electrode film 19 and the conductive granular material 32.
- the contact hole 42 is provided with a through hole 20 that penetrates the interlayer insulating film 18 and the interlayer insulating film 13 on the main wiring 14 c, and the through hole 20 and the electrode film 19 are connected to each other.
- the main wiring 14c and the gate wiring 12 are electrically connected to each other. That is, the electrode film 19 is exposed on the interlayer insulating film 18 in the contact portion 42, on the interlayer insulating film 13, the main wiring 14 c, and the interlayer insulating film 18 in the through hole 20, and on the bottom of the through hole 20. It is continuously stacked on the gate wiring 12.
- the electrode film 19 is also formed on the wall surfaces of these layers.
- the electrode film 19 shown in FIGS. 5 and 6 is formed simultaneously with the pixel electrode 43 by using the same material (for example, ITO) as the pixel electrode 43 in the pixel region 3.
- a conduction preventing member 31 (31a, 31b) made of an insulating resin is provided on the electrode film 23 of the counter substrate 2. Yes.
- the conduction preventing member 31 is embedded (or surrounded) in the sealing material 40, but is a separate structure from the sealing material 40.
- An alignment film (not shown) extending from the pixel region 3 may be interposed between the electrode film 23 and the conduction preventing member 31.
- the conduction preventing member 31 needs to be provided so as to at least partially overlap the electrode film 19 of the active matrix substrate 1 in the normal direction of the substrate surface.
- the conduction preventing member 31 a is provided so as to overlap the entire electrode film 19 in the normal direction of the substrate surface, and the conduction preventing member 31 b is provided at a position not overlapping the electrode film 19. Yes.
- the conduction preventing member 31b may not be provided, and the conduction preventing member 31a does not necessarily need to overlap the entire electrode film 19.
- the conduction preventing member 31 is formed in a columnar shape or a wall shape by using the same material as a protruding structure (here, a photo spacer) provided in the pixel region 3.
- the conduction preventing member 31 and the photo spacer can be simultaneously formed by a photolithography process using, for example, a transparent photosensitive acrylic resin as a material.
- the end surface on the active matrix substrate 1 side of the conduction preventing member 31a has a width and a length sufficient to cover at least the electrode film 19 of the contact portion.
- the conduction preventing member 31a is provided so as to protrude from the surface of the electrode film 23 of the counter substrate 2, and when the active matrix substrate 1 and the counter substrate 2 are bonded together, There is no gap between them. Thereby, in the contact part 42, there is no room for the sealing material 40 to enter between the electrode film 19 of the active matrix substrate 1 and the common electrode (electrode film 23) of the counter substrate 2. Therefore, according to this configuration, it is possible to prevent the conductive granular material 32 in the sealing material 40 from short-circuiting the active matrix substrate 1 and the counter substrate 2 at the contact portion 42.
- FIG. 19 shows a configuration (liquid crystal module 901) in which the conduction preventing member 31 is omitted from the liquid crystal module 101 according to the present embodiment.
- the liquid crystal module 901 according to the comparative example has the same structure as the liquid crystal module 101 according to the present embodiment except that the conduction preventing member 31 is not provided.
- the conductive granular material 32 included in the sealing material 40 is between the electrode film of the active matrix substrate 1 and the electrode film 23 of the counter substrate 2.
- the active matrix substrate 1 and the counter substrate 2 may be short-circuited.
- the problem that the active matrix substrate 1 and the counter substrate 2 are caused by the conductive granular material 32 can be solved by the conduction preventing member 31. it can.
- the conduction preventing member 31 has an effect of performing the same function as a photo spacer that defines a cell gap in the pixel region 3. Therefore, when the conduction preventing member 31 is formed of the same material as that of the photospacer that defines the cell gap, the conduction preventing member 31b is provided at a location other than the contact portion 42 outside the pixel region 3 as shown in FIG. A configuration is preferable. According to this configuration, it is possible to obtain an effect that the conduction preventing member 31b keeps the distance between the active matrix substrate 1 and the counter substrate 2 outside the pixel region 3 uniform.
- the conduction preventing member 31 is preferably formed at the same time as the photo spacer by the same material as the photo spacer for keeping the active matrix substrate 1 and the counter substrate 2 at a predetermined interval in the pixel region 3. In this case, there is an advantage that the conduction preventing member 31 can be formed without increasing the number of manufacturing steps.
- the protruding structure provided in the pixel region 3 may have an alignment control structure that defines the alignment state of the liquid crystal in addition to the photo spacer that defines the substrate interval.
- a detailed example of the orientation control structure will be described later with reference to FIG.
- the conduction preventing member 31 is formed of the same material as the alignment control structure, not a photo spacer that defines the substrate interval. It is also possible to do.
- the conduction preventing member 31 may be formed of a material different from that of the photo spacer, or may be formed in a step different from that of the photo spacer. Furthermore, the conduction preventing member 31 may be formed of a material different from that of the alignment control structure, or may be formed in a process different from that of the alignment control structure.
- the counter substrate in the normal direction of the substrate surface, is overlapped at least partially with the electrode film 19 outside the pixel region of the active matrix substrate 1.
- a conduction blocking member 31 is provided on the two common electrodes (electrode film 23).
- FIG. 7 is a cross-sectional view illustrating a schematic configuration of a first modification of the liquid crystal module 101 according to the second embodiment.
- a short cut glass fiber (in-seal spacer) 35 is mixed in the sealing material 40 together with the conductive granules 32.
- the glass fiber 35 has a cylindrical shape, and its cross-sectional diameter is smaller than that of the conductive granular material 32. Unlike the conductive granular material 32, the glass fiber 35 is not deformed when the active matrix substrate 1 and the counter substrate 2 are bonded together. Alternatively, the glass fiber 35 is harder than the conductive granules 32 and has a high elastic modulus.
- the cross-sectional diameter of the glass fiber 35 defines the minimum distance between the active matrix substrate 1 and the counter substrate 2 at the place where the sealing material 40 is disposed.
- the diameter of the conductive granule 32 (at least the diameter before the deformation is applied or the diameter of the widest portion after the deformation) is preferably slightly larger than the minimum distance (that is, the cross-sectional diameter of the glass fiber 35).
- the diameter before deformation of the conductive granular material 32 or the diameter of the longest portion is in the range of about 4 to 5 ⁇ m. Is preferably larger.
- the diameter of the conductive granular material 32 is preferably about 4 ⁇ m.
- the glass fiber 35 is mixed with the sealing material 40, so that the glass fiber 35 has a function equivalent to a photo spacer that defines a cell gap in the pixel region 3. Fulfill.
- the effect that the distance between the active matrix substrate 1 and the counter electrode 2 outside the pixel region 3 can be kept uniform can be obtained.
- the columnar glass fiber 35 is used as the spacer in the seal, but a spherical hard plastic bead can be used instead of the glass fiber.
- the plastic beads in this case are preferably slightly smaller in diameter than the conductive granules 32 and harder than the conductive granules 32.
- FIG. 8 is a cross-sectional view illustrating a schematic configuration of a second modification of the liquid crystal module 101.
- the second modification of the liquid crystal module 101 includes a conduction blocking member 36 (36 a, 36 b) instead of the above-described conduction blocking member 31.
- the reference numerals 36a and 36b are used.
- the reference numerals are used.
- the conduction blocking member 36 is provided so as to protrude from the counter substrate 2, but the height of the conduction blocking member 36 is the cell gap between the active matrix substrate 1 and the counter substrate 2. It is smaller than the size (that is, the height of the photo spacer in the pixel region 3).
- the height of the conduction preventing member 36 is that (a) the end face of the conduction preventing member 36 does not contact the electrode film 19 when the active matrix substrate 1 and the counter substrate 2 are bonded together by the sealing material 40. It is preferable to satisfy the conditions. By satisfying the condition (a), the end face of the conduction preventing member 36 does not come into strong contact with the electrode film 19 when the substrates are bonded together. As a result, contact failure due to the tearing of the electrode film 19 can be prevented.
- the height of the conduction preventing member 36 is such that, in addition to the condition (a), the conductive granular material 32 enters between the electrode film 19 and the end face on the active matrix substrate 1 side in the conduction preventing member 36 (b).
- the second condition that the distance between the active matrix substrate 1 and the counter substrate 2 is not affected is satisfied. This is because the distance between the active matrix substrate 1 and the counter substrate 2 can be kept uniform by satisfying the condition (b).
- the height of the photo spacer (or cell gap) in the pixel region 3 and the conduction preventing member 36 are different.
- the conduction preventing member 36 can be simultaneously formed using the same material as the photo spacer in the pixel region 3.
- a positive type photosensitive acrylic resin has a property that an exposed portion melts in a developmental manner, so that the depth of a concave shape formed by etching differs depending on the exposure amount. Utilizing this property, a photomask (so-called so-called photomask) in which a positive photosensitive acrylic resin is applied on the electrode film 23 of the counter substrate 2 and films having different transmittances are partially arranged or slits are provided. If the half-tone mask) is used, both the conduction preventing member 36 and the photo spacer can be simultaneously formed in different thicknesses with a single mask, and the manufacturing efficiency is improved.
- the liquid crystal An alignment control structure for defining the alignment state of the pixel region 3 may be provided.
- the height of the alignment control structure is generally lower than the height of the photo spacer for defining the cell gap.
- the conduction preventing member 36a provided in the contact part 42 and the conduction preventing member 36b provided in a place other than the contact part 42 are both formed to be lower than the cell gap. Illustrated. However, the heights of the conduction preventing member 36a and the conduction preventing member 36b do not have to be the same. For example, in the case where the photo spacer and the alignment control structure are provided in the pixel region 3 as described above, the conduction preventing member 36b is formed using the same material as the photo spacer and having the same height. Then, the conduction preventing member 36a may be formed of the same material as the orientation control structure and having the same height.
- the conduction preventing member 36 may be formed of a material different from that of the photo spacer, or may be formed in a step different from that of the photo spacer. Furthermore, the conduction preventing member 36 may be formed of a material different from that of the alignment control structure, or may be formed in a process different from that of the alignment control structure.
- the glass fiber 35 is not essential in the 2nd modification.
- the liquid crystal module 100 according to the first embodiment includes a conduction blocking member 36 instead of the conduction blocking member 31. It is possible to achieve the same effect.
- FIG. 9 is a cross-sectional view illustrating a schematic configuration of a third modification of the liquid crystal module 101.
- the third modification of the liquid crystal module 101 has a configuration in which unevenness is provided on the end surface on the active matrix substrate 1 side of the conduction preventing member 36 according to the second modification.
- Such unevenness on the end face of the conduction preventing member 36 is caused by a plurality of small regions having different light transmittances on the photomask corresponding to the end face when the conduction preventing member 36 is patterned by a photolithography process. It can be realized by providing.
- the conduction preventing member 36 is formed of a body-type photosensitive resin, a mask portion having a low light transmittance is made to correspond to the convex portion on the end face of the conduction preventing member 36, and the cylindrical portion to be the concave portion.
- a mask portion having a high transmittance may be associated with.
- the unevenness on the end face of the conduction preventing member 36 be as rough and deep as possible. According to this configuration, if the active matrix substrate 1 and the counter substrate 2 are bonded together, the thermosetting resin 33 or the conductive material of the sealing material 40 is interposed between the end surface of the conduction preventing member 36 and the active matrix substrate 1. Even if the granular material 32 enters, these entering objects can be absorbed by the recesses. As a result, even if the sealing material 40 enters between the end face of the conduction preventing member 36 and the active matrix substrate 1, the change between the active matrix substrate 1 and the counter substrate 2 hardly occurs, and the distance between the two substrates Can be maintained at a desired value.
- FIG. 9 shows an example in which the glass fiber 35 is mixed with the sealing material 40, the glass fiber 35 is not essential in the third modified example.
- irregularities are formed on the end surface (the end surface on the active matrix substrate 1 side or the counter substrate 2 side) in the normal direction of the substrate surface of the conduction preventing member 31 (see the first modification) having substantially the same height as the cell gap. You may do it.
- FIG. 10 is a cross-sectional view illustrating a schematic configuration of a fourth modification of the liquid crystal module 101.
- the conduction preventing member 31 is provided with a conduction preventing member 37 (37a to 37c) colored in black so as not to transmit light.
- the reference numerals 37a to 37c are used, and when the explanation common to the conduction preventing members 37a to 37c is performed, the reference numerals are used. 37 is used.
- the conduction preventing member 37 can be made of a photosensitive acrylic resin colored in black.
- the conduction preventing member 37 can be formed in the same process using the same material as the photo spacer in the pixel region 3.
- the conduction preventing member 37 may be formed of a material different from that of the photo spacer, or may be formed in a step different from that of the photo spacer.
- the conduction blocking member 37c (second conduction blocking member) is provided also on the TFT 30 of the gate driver 4a, the light shielding layer 24 (see FIG. 3) of the counter substrate 2 is not necessary. Note that the conduction preventing member 37c does not need to cover the entire TFT 30, and only needs to act so that light does not enter at least the channel region.
- the glass fiber 35 may be mixed into the sealing material 40.
- the conduction preventing member 37 may be used instead of the conduction preventing member 31 of the liquid crystal module 100 according to the first embodiment, thereby obtaining the same effect.
- FIG. 11 is a cross-sectional view illustrating a schematic configuration of a fifth modification of the liquid crystal module 101.
- a thermosetting resin 38 colored in black is used as the base material of the sealing material 40 instead of the transparent thermosetting resin 33. This is different from the fourth modification.
- the black conduction preventing member 37c is provided above the TFT 30 of the gate driver 4a, so that the light shielding layer 24 (see FIG. 3) on the counter substrate 2 side becomes unnecessary. ing.
- the conduction preventing member 37c does not need to cover the entire TFT 30, and may be arranged so that light does not enter at least the channel region.
- the sealing material 40 may be extended to above the TFT 30.
- the channel region of the TFT 30 is covered with the black thermosetting resin 38, the deterioration of the characteristics of the TFT 30 can be prevented even without the light shielding layer 24 of the counter substrate 2.
- the sealing material 40 is not formed outside the main wiring region but is formed above the gate driver 4a.
- the glass fiber 35 may be mixed into the sealing material 40.
- FIG. 12 is a cross-sectional view illustrating a schematic configuration of a sixth modification of the liquid crystal module 101.
- the sixth modification of the liquid crystal module 101 is characterized in that the conduction preventing member 39 (39a, 39b) is provided not on the counter substrate 2 but on the active matrix substrate 1 side. . That is, the conduction preventing member 39 is formed on the active matrix substrate 1 side before the active matrix substrate 1 and the counter substrate 2 are bonded to each other.
- the photo spacer in the pixel region 3 is also provided on the active matrix substrate 1 side, and the conduction preventing member 39 may be formed simultaneously using the same material as the photo spacer in the pixel region 3. preferable.
- the conduction preventing member 39 may be formed of a material different from that of the photo spacer, or may be formed in a process different from that of the photo spacer.
- the glass fiber 35 may be mixed into the sealing material 40 (see the first modified example). Moreover, you may form the height of the conduction
- the conduction preventing member 39 may be used in place of the conduction preventing member 31 of the liquid crystal module 100 according to the first embodiment, and the same effect can be obtained.
- the description will be given by taking the liquid crystal display device 101 of the second modification of the second embodiment shown in FIG. 8 as an example. That is, in the example described below, the conduction preventing member 36 having a height smaller than the cell gap is provided on the counter substrate 2 side, and the glass fiber 35 is mixed with the sealing material 40 although it is not essential. It has a configuration (see FIG. 8).
- FIG. 13 is a cross-sectional view showing in more detail the configuration in the vicinity of the conduction portion 41 (see FIG. 4) in the liquid crystal display device 101 of the second modification.
- FIG. 14 is a cross-sectional view showing in more detail the configuration in the vicinity of the contact portion 42 in the second modification.
- FIG. 15 shows the configuration of the DD cross section (cross sectional configuration of the pixel) shown in FIG.
- the main wiring 14d in this embodiment has a three-layer structure in which the lower layer is a titanium layer 141d, the middle layer is an aluminum layer 142d, and the upper layer is a titanium layer 143d.
- the gate wiring 6 of the pixel region 3 formed simultaneously with the main wiring 14d has the same structure as the main wiring 14d.
- the electrode film 19 is made of ITO, like the pixel electrode 43 in the pixel region 3.
- the active matrix substrate 1 is provided with an interlayer insulating film 13 and a passivation film 143 formed on the interlayer insulating film 13 as shown in FIG. Yes.
- the passivation film 143 is a silicon nitride film, and has an effect of preventing deterioration of characteristics of the active element. Further, an interlayer insulating film 18 made of a photosensitive acrylic resin is provided above the passivation film 143. The thickness of the interlayer insulating film 18 is about 2 to 4 ⁇ m at the thickest portion.
- the gate wiring 12 has a three-layer structure in which a titanium layer, an aluminum layer, and a titanium layer are sequentially stacked.
- the gate wiring 6 in the pixel region 3 formed simultaneously with the gate wiring 12 has the same structure as the gate wiring 12.
- a silicon nitride film can be used for the interlayer insulating film 13.
- the main wiring 14c has a two-layer structure in which the lower layer is a titanium layer 141c and the upper layer is an aluminum layer 142c, and is formed by the same process as the source wiring 5 in the pixel region 3.
- the contact portion 42 has a region in which the gate wiring 12, the interlayer insulating film 13, and the amorphous silicon film 146 are laminated between the glass substrate 11 and the electrode film 19.
- the contact portion 42 includes a region where the gate wiring 12, the interlayer insulating film 13, the amorphous silicon film 146, and the titanium layer 141c are stacked between the glass substrate 11 and the electrode film 19, and the glass substrate 11 and the electrode film.
- 19 includes a region in which the gate wiring 12, the interlayer insulating film 13, the titanium layer 141c, the aluminum layer 142c, the passivation film 143, and the interlayer insulating film 18 are stacked.
- the upper layer of the main wiring 14 c (that is, the aluminum layer 142 c) is removed by etching at the location where the main wiring 14 c is connected, and the titanium layer 141 c and the electrode film 19 are in contact Yes.
- a passivation film 143 that covers the interlayer insulating film 13 and the main wiring 14 is preferably provided.
- the passivation film 143 is a silicon nitride film.
- an interlayer insulating film 18 made of a photosensitive acrylic resin is provided on the passivation film 143.
- the thickness of the thickest portion of the interlayer insulating film 18 is about 2 to 4 ⁇ m.
- the electrode film 19 is in electrical contact with the titanium layer 141 c of the main wiring 14 c and the gate wiring 12 in the through hole 20 (hereinafter also referred to as a contact hole 20).
- a stepped portion 144 is provided in the contact hole 20 of the interlayer insulating film 18, and a gentle slope is formed between the opening end of the contact hole 20 and the stepped portion 144. 145 is formed.
- the stepped portion 144 is a portion formed lower than the uppermost surface of the interlayer insulating film 18.
- the electrode film 19 extends from the bottom of the contact hole 20 to the middle of the stepped portion 144. As described above, the end portion of the electrode film 19 is located on the stepped portion 144 and does not reach the slope 145 and the surface of the interlayer insulating film 18, so that the distance between the electrode film 19 and the electrode film 23 of the counter substrate is sufficiently large. Can be secured.
- the thickness of the conduction preventing member 36 is the same as that of the active matrix substrate 1 and the opposing substrate even if the conductive granular material 32 enters between the end surface of the conduction preventing member 36 on the counter substrate 2 side and the electrode film 19.
- the thickness is determined so as not to substantially change the distance from 2.
- the thickness of the interlayer insulating film 18 is about 2.5 ⁇ m at the thickest portion
- the cross-sectional diameter of the glass fiber 35 is about 3 ⁇ m
- the diameter of the conductive granular material 32 is about 4 ⁇ m.
- the sum of the thickness of the film 18 and the cross-sectional diameter of the glass fiber 35 is about 5.5 ⁇ m.
- the height of 36 is preferably less than about 1.5 ⁇ m. In this example, the height of the conduction preventing member 36 is about 1.0 ⁇ m.
- FIG. 15 is a sectional view taken along line DD shown in FIG.
- a photo spacer 53 for controlling the cell gap is formed above the source wiring 5.
- a black matrix (BM) 149 is provided above the photo spacer 53.
- the black matrix 149 is provided at the boundary of the red color filter 150R, the green color filter 150G, and the blue color filter 150B. It is arranged so as to overlap with the lower source wiring 5.
- Each of the red color filter 150R, the green color filter 150G, and the blue color filter 150B is disposed so as to overlap an area (pixel opening) where the pixel electrode 43 is provided.
- the thickness of the black matrix 149 is about 1 ⁇ m
- the thickness of each of the red color filter 150R, the green color filter 150G, and the blue color filter 150B is about 2 ⁇ m
- the thickness of the overcoat film 22 on the color filter is about 0. .5 ⁇ m.
- the source wiring 5 in the pixel region 3 has a laminated structure of a titanium layer 51 and an aluminum layer 52, similarly to the basic wiring 14 described above.
- a passivation film 143 is laminated on the interlayer insulating film 13 and the source wiring 5.
- an interlayer insulating film 18 made of a photosensitive acrylic resin is laminated on the passivation film 143.
- the thickness of the interlayer insulating film 18 is about 2.5 ⁇ m at the thickest portion.
- the surface of the interlayer insulating film 18 is substantially flat.
- a plurality of pixel electrodes 43 are arranged in a matrix on the interlayer insulating film 18.
- An alignment film 147 is formed on the pixel electrode 43.
- the counter substrate 2 includes a glass substrate 21, color filters 150R, 150G, and 105B for each color, a black matrix 149, an overcoat film 22, and an electrode film 23 stacked in this order.
- the electrode film 23 is a common electrode made of ITO.
- the thickness of the electrode film 23 is about 0.1 ⁇ m.
- a photo spacer 53 of a photosensitive acrylic resin is formed on the electrode film 23, a photo spacer 53 of a photosensitive acrylic resin is formed.
- An alignment film 148 is formed so as to cover the electrode film 23 and the photo spacer 53.
- Each of the alignment films 147 and 148 has a thickness of about 100 nm.
- the line width of one source line 5 is about 2 to 3 ⁇ m, and the line width of the photo spacer 53 and the black matrix 149 overlapping the source line 5 is also about 2 to 3 ⁇ m.
- the height of the photo spacer 53 is about 3 ⁇ m. This is approximately equal to the cross-sectional diameter of the glass fiber 35 that defines the thickness of the sealing material 40.
- the alignment control that defines the alignment state of the liquid crystal in addition to the photo spacer that defines the substrate interval.
- a structure may be formed.
- This alignment control structure is used in, for example, a vertical alignment type liquid crystal module.
- a specific configuration example of the orientation control structure will be described with reference to FIG.
- the alignment control structure 81 is formed as a protrusion structure lower than the photo spacer 53 in the pixel region of the vertical alignment type liquid crystal module.
- the alignment films 147 and 148 are vertical alignment films for aligning liquid crystal molecules perpendicular to the substrate surface.
- the alignment control structure 81 is provided on the counter substrate 2 side near the center of each pixel, and the surrounding liquid crystal molecules 341 are radially inclined and aligned.
- the alignment control structure 81 is formed on the electrode film 23 in the same manner as the photo spacer 53. Therefore, the surface of the alignment control structure 81 is covered with the vertical alignment film 148. According to this configuration, the liquid crystal molecules 341 are aligned substantially perpendicular to the inclined surface 81 s by the anchoring effect of the vertical alignment film 48 provided on the inclined surface 81 s of the alignment control structure 81.
- the liquid crystal molecules 341 are radially inclined with the alignment control structure 81 as a center.
- the orientation control structure 81 is formed in a truncated cone shape, the shape may be various shapes such as a cone shape and a triangular pyramid shape.
- the conduction preventing member 31 can be formed of the same material as the orientation control structure 81 in the same process. This provides the advantage that the manufacturing process can be simplified.
- FIG. 17 is a plan view schematically showing the configuration of the TFT 30 in the gate driver 4a and the contact portion 63 disposed in the vicinity thereof.
- 18 is a cross-sectional view taken along line EE shown in FIG.
- the gate driver 4b may have the same configuration.
- the TFT 30 is a comb-shaped TFT, but the switching element in the gate driver 4a is not limited to this.
- an interlayer insulating film 13 is provided above the gate wiring 12, and a silicon layer 15, a drain wiring 61, and a source wiring 62 made of n + silicon or the like are further formed thereon. Etc. are formed.
- the drain wiring 61 and the source wiring 62 are wirings formed in the gate driver 4 a simultaneously with the source wiring 5 by using the same material as the main wiring 14 and the source wiring 5 in the pixel region 3.
- the main wiring 14, the drain wiring 61, and the source wiring 62 have, for example, a two-layer structure of a titanium layer 141c and an aluminum layer 142c.
- a passivation film 143 is stacked on the drain wiring 61 and the source wiring 62.
- An interlayer insulating film 18 is stacked on the passivation film 143.
- a through hole 20 is provided in the interlayer insulating film 18 and the interlayer insulating film 13.
- An electrode film 19 is continuously laminated on the wall surfaces of the interlayer insulating film 13 and the interlayer insulating film 18 in the through hole 20, on the exposed portion of the main wiring 14, and on the gate wiring 12 exposed at the bottom of the through hole 20. ing. With such a structure, the gate wiring 12 and the main wiring 14 are electrically connected in the contact portion 63. When the silicon layer 15 and the passivation layer 143 are exposed in the through hole 20, the electrode film 19 is also formed on these exposed surfaces.
- the sealing material 40 includes a photosensitive resin as a base material, and the sealing material 40 is temporarily cured by irradiating the photosensitive resin with light in the manufacturing process.
- the TFT 30 is irradiated with light
- the channel characteristics deteriorate. Therefore, when the sealing material 40 is formed on the TFT 30, the TFT 30 is irradiated with light in the manufacturing process, and the characteristics of the TFT 30 deteriorate. Arise.
- the sealing material 40 since the sealing material 40 does not exist above the TFT 30, deterioration of the characteristics of the TFT 30 is prevented.
- the TFT 30 is irradiated with external light even after the liquid crystal display device is completed. Therefore, in this embodiment, the light shielding layer 24 is provided above the gate drivers 4a and 4b.
- a conduction blocking member (corresponding to the above-described conduction blocking member 31a) having the same height as the photo spacer that defines the alignment state of the cell gap or the liquid crystal may be provided. Further, as described in the fourth modification, a black conduction preventing member may be provided. Alternatively, as described in the sixth modification, the conduction preventing member 36 may be provided on the active matrix substrate 1 side.
- the conduction preventing member 36 may be formed of a material different from that of the photo spacer, or may be formed in a step different from that of the photo spacer. Furthermore, the conduction preventing member 36 may be formed of a material different from that of the alignment control structure, or may be formed in a process different from that of the alignment control structure.
- the manufacturing process of the active matrix substrate 1 will be described. First, after the glass substrate 11 is washed and dried, a titanium layer, an aluminum layer, and a titanium layer are sequentially laminated on the surface of the glass substrate 11 by sputtering. Next, the three layers are shaped using a photolithography method and a dry etching method to form a gate wiring 12 (first wiring).
- a silicon nitride film that becomes an interlayer insulating film 13 (first insulating layer), an amorphous silicon film that becomes a semiconductor layer of the TFT 7 in the pixel region 3, and an n + amorphous A silicon film is continuously formed by plasma CVD.
- the amorphous silicon film and the n + amorphous silicon film are patterned by using a photolithography method and a dry etching method to obtain a semiconductor layer arranged in an island shape of the TFTs 7 and 30.
- a titanium layer and an aluminum layer are sequentially deposited by sputtering. Thereafter, these two layers are patterned using a photolithography method, a wet etching method, and a dry etching method, and the source wiring 5, source electrode, and drain electrode of the pixel region 3, the main wiring 14, and the gate drivers 4a, 4b.
- the drain wiring 61, the source wiring 62, and the drain electrodes 61a and 61b and the source electrode 62a of the TFT 30 are formed.
- the main wiring 14, the drain wiring 61, and the source wiring 62 are referred to as a second wiring.
- an acrylic resin to be the interlayer insulating film 18 is applied.
- the layers from the interlayer insulating film 18 to the interlayer insulating film 13 are selectively removed by using a photolithography method and a dry etching method, and the contact holes (through holes) 20 shown in FIGS. 5 to 14 and FIG. Form.
- the aluminum layer of the source wiring 5 and the main wiring 14 located in the contact hole 20 may be removed by wet etching. Thereby, the electrolytic corrosion which may arise between the aluminum layer of these wiring and ITO of the electrode film 19 is prevented.
- ITO is formed by sputtering and etched to form the pixel electrode 43 and the electrode film 19 in the pixel region 3.
- an alignment film 147 is formed in the pixel region 3 to complete the active matrix substrate 1.
- a step of forming a conduction preventing member may be added at the end of the manufacturing process of the active matrix substrate.
- the color filters 150R, 150G, and 150B are formed in the portion that becomes the pixel region 3.
- a black matrix 149 is formed at a location above the source wiring 5 and a location above the gate drivers 4a and 4b.
- an overcoat film 22 is formed on the substrate.
- an ITO film is formed on the surface of the overcoat film 22 by sputtering to obtain an electrode film 23 (common electrode).
- a photosensitive acrylic resin is applied to the surface of the electrode film 23, and the conduction preventing member 36 and the photo spacer 53 (see FIGS. 15 and 16) are simultaneously formed using a photolithography method and a dry etching method.
- the photomasks having different transmittances from the cylindrical portion corresponding to the conduction preventing member 36 and the portion corresponding to the photo spacer 53 are used. Should be used.
- the counter substrate 2 is completed by forming an alignment film 148 so as to cover the electrode film 23 and the photo spacer 53 in the pixel region 3.
- the orientation control material 81 shown in FIG. 16 may be formed of the same acrylic resin as that of the conduction preventing member 36 at the same time.
- the sealing material 40 is applied to a predetermined portion including a part of the peripheral area of the counter substrate 2, and after the liquid crystal is dropped on the area surrounded by the sealing material 40, the counter substrate 2 and the active matrix substrate 1 are bonded. to paste together.
- the sealing material 40 may include the thermosetting resin 33 and one or both of the conductive granular material 32 and the glass fiber 35.
- the sealing material 40 is irradiated with ultraviolet rays to temporarily cure the sealing material 40.
- the sealing material 40 is fully cured by heating to a predetermined temperature. The bonding is performed such that at least a part of the electrode film 19 of the active matrix substrate and the conduction preventing member 36 overlap when viewed from the normal direction of the substrate surface of the active matrix substrate.
- the liquid crystal module (bonded substrate) 101 of this embodiment is completed.
- the final form of the liquid crystal display device is completed by incorporating the liquid crystal module 101 into an appropriate housing and attaching necessary drive circuits, power supply circuits, and the like.
- the liquid crystal module 101 is referred to as a liquid crystal display device according to the present invention.
- the final form of the liquid crystal display device may be referred to as a liquid crystal display device according to the present invention.
- the glass substrate is used as the base substrate of the active matrix substrate 1 and the counter substrate 2, but a substrate other than the glass substrate may be used as long as it is a translucent insulating substrate.
- 1 illustrates the configuration in which the two gate drivers 4a and 4b are arranged on both sides of the pixel region 3, the number of gate drivers is not limited to two, and the positions are different from those described above. It is also possible to arrange them.
- 1 shows an example in which the terminal region 8 is formed near one long side of the active matrix substrate 1, the terminal region 8 may be formed near the short side of the active matrix substrate 1.
- a source driver can be monolithically incorporated on the active matrix substrate 1. It is.
- a material for the semiconductor layer of the TFT it is preferable to use microcrystalline silicon (microcrystal silicon), an oxide semiconductor (IZO, IGZO, or the like) that has higher mobility than amorphous silicon.
- the microcrystalline silicon film is generally manufactured using a method similar to the method for forming an amorphous silicon film, such as a plasma CVD method.
- a plasma CVD method As the source gas, silane gas diluted with hydrogen gas is generally used.
- the grain size of crystal grains contained in microcrystalline silicon is as small as several nm to several hundred nm, and microcrystalline silicon is often formed as a mixed state of crystal grains and amorphous silicon.
- finely-structured silicon TFTs can be manufactured with fewer steps than the number of steps required to create a low-temperature crystallized silicon TFT, and are manufactured with the same number of steps and cost as amorphous silicon TFTs. obtain.
- the present invention is suitably used for a liquid crystal cell and a liquid crystal display device including an active matrix substrate having a thin film transistor.
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Abstract
Description
図1は、本発明の第1の実施形態による液晶モジュール(液晶表示装置)の概略構成を模式的に示す平面図である。図1に示すように、第1の実施形態の液晶モジュール100は、アクティブマトリクス基板1と対向基板2とを有する。アクティブマトリクス基板1と対向基板2とは、画素領域内に設けられたフォトスペーサ(突起状構造物)によって所定の間隔を保ちつつ、シール材(図示せず)により貼り合わされている。そして、アクティブマトリクス基板1と対向基板2とシール材とによって形成される空間に液晶が封止されている。
本発明の第2の実施形態について、図4~6を参照して、以下に説明する。なお、以下の説明において、第1の実施形態で説明した構成と同様の機能を有する構成については同じ参照符号を付記し、その詳細な説明を省略する。
図7は、第2の実施形態による液晶モジュール101の第1の変形例の概略構成を示す断面図である。図7に示すように、液晶モジュール101の第1の変形例では、シール材40中に、導電性粒状体32と共に、短く切断されたガラスファイバ(シール内スペーサ)35が混合されている。ガラスファイバ35は円柱状であり、その断面直径は導電性粒状体32よりも小さい。ガラスファイバ35は、導電性粒状体32とは異なり、アクティブマトリクス基板1と対向基板2との貼り合わせ時に変形しない。あるいは、ガラスファイバ35は導電性粒状体32よりも硬く、高い弾性率を有している。したがって、ガラスファイバ35の断面直径が、シール材40が配置された箇所における、アクティブマトリクス基板1と対向基板2との最小間隔を規定することとなる。導電性粒状体32の直径(少なくとも変形が加えられる前の直径、あるいは変形後の最も幅の広い部分の直径)は、この最小間隔(すなわちガラスファイバ35の断面直径)よりも若干大きいことが好ましい。
図8は、液晶モジュール101の第2の変形例の概略構成を示す断面図である。図8に示すように、液晶モジュール101の第2の変形例は、上述の導通阻止部材31の代わりに、導通阻止部材36(36a、36b)を備えている。以下の説明においては、導通阻止部材36a、36bを区別して説明する必要がある場合は、参照符号として36a、36bを用い、導通阻止部材36a、36bに共通した説明を行う場合は、参照符号として36を用いる。
図9は、液晶モジュール101の第3の変形例の概略構成を示す断面図である。図9に示すように、液晶モジュール101の第3の変形例は、第2の変形例にかかる導通阻止部材36のアクティブマトリクス基板1側の端面に凹凸を設けた構成である。
図10は、液晶モジュール101の第4の変形例の概略構成を示す断面図である。図10に示すように、液晶モジュール101の第4の変形例においては、導通阻止部材31として、光を通さないように黒色に着色された導通阻止部材37(37a~37c)が設けられている。以下の説明においては、導通阻止部材37a~31cを区別して説明する必要がある場合は、参照符号として37a~37cを用い、導通阻止部材37a~37cに共通した説明を行う場合は、参照符号として37を用いる。導通阻止部材37は、黒く着色された感光性アクリル樹脂によって作成可能である。
図11は、液晶モジュール101の第5の変形例の概略構成を示す断面図である。図11に示すように、液晶モジュール101の第5の変形例は、シール材40の基材として、透明な熱硬化性樹脂33の代わりに、黒色に着色された熱硬化性樹脂38を用いた点で、第4の変形例と異なっている。
図12は、液晶モジュール101の第6の変形例の概略構成を示す断面図である。図12に示すように、液晶モジュール101の第6の変形例は、導通阻止部材39(39a、39b)が、対向基板2ではなく、アクティブマトリクス基板1側に設けられていることが特徴である。つまり、アクティブマトリクス基板1と対向基板2との貼り合わせ前に、導通阻止部材39がアクティブマトリクス基板1側に形成される。なお、この変形例においては、画素領域3のフォトスペーサもアクティブマトリクス基板1側に設けられており、導通阻止部材39は、画素領域3のフォトスペーサと同じ材料を用いて同時に形成されることが好ましい。ただし、導通阻止部材39は、上記フォトスペーサと異なる材料で形成してもよく、また、上記フォトスペーサと異なる工程で、形成してもよい。
2 対向基板
3 画素領域
4 ゲートドライバ
5 ソース配線
6 ゲート配線
7 TFT
8 端子領域
11 ガラス基板
12 ゲート配線
14 基幹配線
19 電極膜
20 貫通孔
31 導通阻止部材
36 導通阻止部材
37 導通阻止部材
39 導通阻止部材
53 フォトスペーサ
81 配向制御構造物
100 液晶モジュール
101 液晶モジュール
Claims (16)
- 複数の画素電極が形成された画素領域と、前記画素領域の外側に位置する周辺領域とを有し、アクティブマトリクス基板と、共通電極を有する対向基板とを備えた液晶表示装置であって、
前記アクティブマトリクス基板が、
前記周辺領域に延びる第1配線と、
前記第1配線の上に形成された第1絶縁層と、
前記周辺領域において前記絶縁層の上に延びる第2配線と、
前記第2配線の上に形成された第2絶縁層と、
前記周辺領域において、前記第1絶縁層および前記第2絶縁層に形成された貫通孔の中に配置され、前記第1配線と前記第2配線とを電気的に接続する電極膜と、を備え、
前記周辺領域における前記アクティブマトリクス基板と前記対向基板との間に、
前記アクティブマトリクス基板と前記対向基板とを貼り合わせるシール材と、
前記アクティブマトリクス基板の基板面法線方向から見た場合、前記電極膜と少なくとも一部が重なる位置に配置され、前記電極膜と前記共通電極とが導通することを妨げる導通阻止部材と、が配置されていることを特徴とする液晶表示装置。 - 前記導通阻止部材が前記電極膜と前記共通電極との両方に接する、請求項1に記載の液晶表示装置。
- 前記導通阻止部材が前記電極膜と前記共通電極との一方のみに接する、請求項1に記載の液晶表示装置。
- 前記導通阻止部材が、前記アクティブマトリクス基板に接することなく前記アクティブマトリクス基板に対面する端面を有し、
前記導通阻止部材の前記端面に凹凸が形成されている、請求項1または3に記載の液晶表示装置。 - 前記周辺領域における前記アクティブマトリクス基板の上に配置された駆動回路と、
前記周辺領域における前記アクティブマトリクス基板と前記対向基板との間に配置され、かつ、前記アクティブマトリクス基板の基板面法線方向から見た場合、前記駆動回路と重なる位置に配置された第2の導通阻止部材を備える、請求項1から4のいずれかに記載の液晶表示装置。 - 前記第2の導通阻止部材が黒色であり、
前記アクティブマトリクス基板の基板面法線方向から見た場合、前記駆動回路のチャネル領域と前記第2の導通阻止部材とが少なくとも一部が重なるように配置されている、請求項5に記載の液晶表示装置。 - 前記画素領域内で前記アクティブマトリクス基板と前記対向基板との間に設けられた突起状構造物を備え、
前記導通阻止部材が、前記突起状構造物と同じ材料で形成されている、請求項1から6のいずれかに記載の液晶表示装置。 - 前記突起状構造物が、前記アクティブマトリクス基板と前記対向基板との間隔を規定するスペーサである、請求項7に記載の液晶表示装置。
- 前記突起状構造物が、液晶の配向状態を規定する配向制御構造物である、請求項7に記載の液晶表示装置。
- 前記シール材が、導電性粒状体を含み、
前記シール材が、前記電極膜と前記対向基板の共通電極との間に配置されている、請求項1から9のいずれかに記載の液晶表示装置。 - 前記貫通孔における前記第2絶縁層の表面に段差部が形成されており、
前記電極膜の端部が前記段差部の上に位置する、請求項1から10のいずれかに記載の液晶表示装置。 - 複数の画素電極が形成された画素領域と、前記画素領域の外側に位置する周辺領域とを有し、アクティブマトリクス基板と、共通電極を有する対向基板とを備えた液晶表示装置の製造方法であって、
前記アクティブマトリクス基板に、前記周辺領域に延びる第1配線を形成する工程と、
前記アクティブマトリクス基板の前記第1配線の上に、第1絶縁層を形成する工程と、
前記アクティブマトリクス基板の前記第1絶縁層の上に、前記周辺領域に延びる第2配線を形成する工程と、
前記アクティブマトリクス基板の前記第2配線の上に、第2絶縁層を形成する工程と、
前記周辺領域において、前記第1絶縁層および前記第2絶縁層前に貫通孔を設ける工程と、
前記貫通孔のなかに、前記第1配線と前記第2配線とを電気的に接続する電極膜を形成する工程と、
前記対向基板に共通電極を形成する工程と、
前記アクティブマトリクス基板および前記対向基板の少なくとも一方に、前記電極膜と前記共通電極とが導通することを妨げる導通阻止部材を形成する工程と、
前記アクティブマトリクス基板の基板面法線方向から見た場合、前記電極膜の少なくとも一部と前記導通阻止部材とが重なるように、前記アクティブマトリクス基板と前記対向基板とを、シール材で貼り合わせる工程と、を含むことを特徴とする、液晶表示装置の製造方法。 - 前記アクティブマトリクス基板および前記対向基板の少なくとも一方の前記画素領域内に、前記導通阻止部材の材料と同じ材料によって、突起状構造物を形成する工程を含み、
前記突起状構造物を形成する工程と前記導通阻止部材を形成する工程とが同時に行われる、請求項12に記載の液晶表示装置の製造方法。 - 前記突起状構造物が、前記アクティブマトリクス基板と前記対向基板との間隔を規定するスペーサである、請求項13に記載の液晶表示装置の製造方法。
- 前記突起状構造物が、液晶の配向状態を規定する配向制御構造物である、請求項13に記載の液晶表示装置の製造方法。
- 前記シール材として、導電性粒状体を含むシール材を用い、
前記シール材を、前記電極膜と前記対向基板の前記共通電極との間に配置する、請求項12から15のいずれかに記載の液晶表示装置の製造方法。
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US13/499,705 US20120194772A1 (en) | 2009-10-08 | 2010-10-07 | Liquid crystal display device and method for manufacturing same |
BR112012008252A BR112012008252A2 (pt) | 2009-10-08 | 2010-10-07 | dispositivo de exibição de cristal líquido e método para a produção do mesmo. |
RU2012118652/28A RU2497169C1 (ru) | 2009-10-08 | 2010-10-07 | Жидкокристаллическое устройство отображения и способ его изготовления |
EP10822110A EP2487539A1 (en) | 2009-10-08 | 2010-10-07 | Liquid crystal display device and method for manufacturing same |
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CN102576173A (zh) | 2012-07-11 |
EP2487539A1 (en) | 2012-08-15 |
KR20120064722A (ko) | 2012-06-19 |
KR101232988B1 (ko) | 2013-02-13 |
BR112012008252A2 (pt) | 2016-03-08 |
US20120194772A1 (en) | 2012-08-02 |
JPWO2011043440A1 (ja) | 2013-03-04 |
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