WO2010070960A1 - 液晶パネルおよび液晶表示装置 - Google Patents
液晶パネルおよび液晶表示装置 Download PDFInfo
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- WO2010070960A1 WO2010070960A1 PCT/JP2009/066393 JP2009066393W WO2010070960A1 WO 2010070960 A1 WO2010070960 A1 WO 2010070960A1 JP 2009066393 W JP2009066393 W JP 2009066393W WO 2010070960 A1 WO2010070960 A1 WO 2010070960A1
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- liquid crystal
- alignment film
- crystal panel
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- barrier
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
- G02F1/133723—Polyimide, polyamide-imide
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133388—Constructional arrangements; Manufacturing methods with constructional differences between the display region and the peripheral region
Definitions
- the present invention relates to a liquid crystal panel and a liquid crystal display device.
- liquid crystal display devices having a liquid crystal panel have been widely used as image display devices (displays) such as televisions and personal computers.
- a liquid crystal material is sealed between a pair of glass substrates (typically an array substrate and a color filter (CF) substrate) bonded to each other with a sealant at a predetermined interval.
- the sealing material is disposed on the periphery of the glass substrate so as to surround the active area (effective display area, that is, the display screen) in order to contain the liquid crystal material between the substrates, and constitutes a sealing portion of the liquid crystal panel.
- an alignment film made of a resin material typically polyimide
- the liquid crystal display device having such a configuration is placed under severe high temperature and high humidity conditions, for example, in a high temperature and high humidity atmosphere where the temperature is 40 ° C. to 50 ° C. and the relative humidity is almost 100%. Therefore, it is necessary to take measures to prevent moisture from entering the panel. That is, in the liquid crystal panel in the liquid crystal display device, moisture in the atmosphere enters the liquid crystal layer beyond the seal portion, and further, when the penetrated moisture reaches the active area, it is uncomfortable for the viewer. This is not preferable because it may cause spots (cloudiness) and lower the display quality. The occurrence of such a defect is presumed to be caused by a decrease in the orientation of the liquid crystal molecules in the moisture intrusion region due to the reaction between the infiltrated moisture and the constituent material of the alignment film.
- FIG. 6A is a schematic plan view of a conventional liquid crystal panel 210.
- 6B is a cross-sectional view taken along the line VI-VI of FIG. 6A, and shows the periphery of the conventional liquid crystal panel 210 (the periphery of the sealing material (seal part) 216 disposed between the pair of opposing glass substrates 211 and 212). It is a typical sectional view in area 210a.
- the glass substrate 211 is a color filter (CF) substrate
- the glass substrate 212 is an array substrate. As shown in FIGS.
- Patent Document 1 proposes a technique for forming an alignment film region pattern so as to be in contact with a peripheral sealing material (seal portion).
- a seal is provided between a convex portion provided on the surface of the alignment film formed on one of a pair of opposing substrates and a concave portion provided on the surface of the alignment film formed on the other of the substrates.
- Patent Documents 1 and 2 it is difficult to completely prevent moisture from entering between the substrates of the liquid crystal panel when exposed to the high temperature and high humidity atmosphere as described above.
- the present invention has been made in view of the above problems, and its main purpose is to generate stains (cloudiness) due to the ingress of moisture between a pair of substrates even in the high temperature and high humidity atmosphere as described above. It is an object of the present invention to provide a liquid crystal panel in which deterioration of display quality such as the above is prevented. Another object is to provide a liquid crystal display device including such a liquid crystal panel.
- a liquid crystal panel provided by the present invention includes a pair of opposing substrates, a liquid crystal layer disposed between the pair of substrates, and holding the liquid crystal layer between the pair of substrates. And a seal portion disposed at a peripheral portion between the substrates so as to surround the liquid crystal layer.
- an alignment film for aligning the liquid crystal molecules of the liquid crystal layer is formed on the surface facing the liquid crystal layer in at least one of the pair of substrates.
- a barrier portion made of a material constituting the alignment film is formed near the inner side of the seal portion so as to be thicker than the alignment film.
- the barrier portion is formed in the vicinity of the seal portion inside the seal portion, so that moisture in an external atmosphere passes between the seal portion and the substrate and the seal portion. Even if it enters the inside (that is, in the liquid crystal layer), the moisture (in other words, water molecules) can be trapped in the barrier portion. That is, it is possible to prevent the intrusion moisture (H 2 O molecules) from reacting with the alignment film constituent material molecules (polymer compound) constituting the barrier portion and to enter the moisture further inside the barrier portion.
- the barrier section having a volume capable of trapping all the moisture amount that can enter between the pair of substrates is provided.
- the moisture that can enter reacts (consumes) in the barrier section, so that the entrance of the moisture is blocked by the barrier section, and it is effective to enter the active area inside the barrier section. Can be prevented. Therefore, according to the liquid crystal panel according to the present invention, even if moisture in the external atmosphere enters the gap between the pair of substrates of the liquid crystal panel, deterioration of display quality such as spots that may occur with the penetration into the active area Can be prevented at a high level.
- a groove portion is formed along the inside of the seal portion on the surface of the substrate facing the liquid crystal layer, and the alignment film constituent material is formed in the groove portion.
- the barrier portion is formed by being stored.
- the alignment film constituent material is stored in a groove formed along the inside of the seal portion (seal material) (preferably so as to be separated from the seal portion toward the inside by a predetermined distance).
- a barrier portion thicker than the alignment film can be easily formed. Therefore, according to the liquid crystal panel having such a configuration, moisture that has entered the inside of the seal portion can be sufficiently trapped by the thick barrier portion.
- the alignment film constituent material is polyimide. According to the liquid crystal panel having such a configuration, since the polyimide constituting the barrier portion can easily react with moisture (H 2 O molecules), the intruding moisture can be efficiently trapped in the barrier portion. Therefore, it is possible to prevent the display quality from being deteriorated due to the ingress of moisture.
- the alignment film and the barrier portion are continuously and integrally formed on at least one surface of the pair of substrates by the alignment film constituent material. It is characterized by.
- the alignment film and the barrier portion are integrally formed by applying the alignment film constituent material to the substrate surface by a conventional alignment film formation process (for example, an alignment film formation process by an ink jet method). The For this reason, it is possible to prevent the intrusion of water and maintain the display quality while suppressing the complexity of the manufacturing process and the increase in manufacturing cost accompanying the formation of the barrier portion.
- the outer boundary line of the barrier portion is formed in a straight line over substantially the entire periphery of the panel.
- the moisture intrusion prevention capability moisture trapping capability in the barrier portion
- this invention provides the liquid crystal display device provided with one of the liquid crystal panels disclosed here as another side surface. Since such a liquid crystal display device includes the liquid crystal panel as described above, even if moisture in the external atmosphere enters the gap between the pair of substrates of the liquid crystal panel, the display quality that can be deteriorated due to the penetration is reduced. It can be effectively prevented.
- FIG. 6B is a sectional view taken along line VI-VI in FIG. 6A.
- FIG. 1 is an exploded perspective view schematically showing a configuration of a liquid crystal display device 100 including a liquid crystal panel 10 according to the present embodiment.
- FIG. 2 is a cross-sectional view schematically showing the configuration of the liquid crystal display device 100 including the liquid crystal panel 10 according to the present embodiment.
- FIG. 3 is a cross-sectional view schematically showing the peripheral edge portion 10a of the liquid crystal panel 10 according to the present embodiment.
- members and parts having the same action are denoted by the same reference numerals, and redundant description may be omitted or simplified.
- front side refers to the side facing the viewer (ie, the liquid crystal panel side) in the liquid crystal display device 100
- back side refers to the side not facing the viewer (ie, the liquid crystal panel side).
- the backlight device side refers to the side not facing the viewer (ie, the liquid crystal panel side).
- the liquid crystal display device 100 includes a liquid crystal panel 10 and a backlight device 20 that is an external light source disposed on the back side (lower side in FIG. 1) of the liquid crystal panel 10.
- the liquid crystal panel 10 and the backlight device 20 are integrally held by being assembled by the bezel 30 or the like.
- the backlight device 20 includes a plurality of linear light sources (for example, fluorescent tubes, typically cold cathode tubes) 22 and a case (chassis) 24 that houses the light sources 22. It consists of and.
- the case 24 has a box shape opened to the front side, and the light sources 22 are arranged in parallel in the case 24, and the light of the light source 22 is efficiently used between the case 24 and the light source 22.
- a reflective member 23 for reflecting the viewer side is disposed.
- a plurality of sheet-like optical members 26 are stacked in the opening of the case 24 so as to cover the opening.
- the configuration of the optical member 26 includes, for example, a diffusion plate, a diffusion sheet, a lens sheet, and a brightness enhancement sheet in order from the backlight device 20 side, but is not limited to this combination and order.
- a substantially frame-like frame 28 is provided in the case 24.
- an inverter circuit board (not shown) for mounting the inverter circuit and an inverter transformer (not shown) as a booster circuit for supplying power to each light source 22 are provided on the back side of the case 24, which characterizes the present invention. Since it is not a thing, description is abbreviate
- the liquid crystal panel 10 generally has a rectangular shape as a whole, and is enclosed between a pair of light-transmitting glass substrates 11 and 12 facing each other and between them. It has a sandwich structure composed of the liquid crystal layer 13.
- the substrates 11 and 12 are each cut from a large base material called mother glass in the manufacturing process.
- the front side is the color filter substrate (CF substrate) 11, and the back side is the array substrate 12.
- the liquid crystal layer 13 is made of a liquid crystal material whose optical characteristics change with application of an electric field between the substrates 11 and 12.
- a sealing material made of a suitable material is applied to the peripheral portions of the substrates 11 and 12 (the peripheral portion 10a in the liquid crystal panel 10), and the sealing portion 16 causes the liquid crystal layer 13 to be formed.
- the liquid crystal layer 13 is sealed so as to surround the liquid crystal layer 13.
- a gap (gap) between the substrate 11 and the substrate 12 is ensured by the seal portion 16 and a grain-shaped spacer (not shown) (typically made of an elastically deformable resin, a large number of which are dispersedly arranged). Is done.
- polarizing plates 17 and 18 are attached to the non-opposing surfaces (outer sides) of both the substrates 11 and 12, respectively.
- the liquid crystal panel 10 has the same configuration as the conventional liquid crystal panel 210 shown in FIG. 6B except for alignment films 48 and 58 and barrier portions 49 and 59 described later. That is, although not shown in FIGS. 1 to 3, an array of pixels for displaying an image is formed on the inner surface side (side facing the liquid crystal layer 13) of the array substrate 12, and each pixel (sub-pixel) is displayed. A plurality of source wirings and gate wirings (corresponding to metal wirings 242 in FIG. 6B) are formed in a lattice pattern. Similarly, although not shown in FIGS.
- a switching element for example, a thin film transistor (TFT)
- a transparent electrode sub
- pixel electrode in FIG. 6B.
- the pixel electrode is typically made of ITO (Indium Tin Oxide) and has a vertically long rectangular shape. Both wirings are connected to an external circuit (driver IC) 14 (see FIG. 1) capable of supplying an image signal or the like.
- driver IC Driver IC
- an insulating film 44 (insulating film 244 in FIG. 6B) is formed on the surface of the array substrate 12 (specifically, the surface of a metal wiring not shown).
- the pixel electrode transparent electrode
- an alignment film 48 is formed on the transparent electrode.
- the CF substrate 11 has a color filter in which three colors R (red), G (green), and B (blue) are arranged at positions corresponding to the pixel electrodes on the array substrate 12 side.
- 52 (corresponding to the color filter 252 in FIG. 6B), a black matrix (light-shielding film) 54 that partitions the filters 52 of each color, and a transparent (not shown) that is uniformly formed on the surfaces of the black matrix 54 and the color filter 52
- a common electrode which is an electrode (corresponding to the common electrode 256 in FIG. 6B) is provided.
- the active area 10b corresponding to the area where the pixel electrode and the color filter 52 are disposed is an area where an image can be displayed (effective display area). Note that the pixel formation, electrode wiring, and the like described above may be the same as those in the case of manufacturing a conventional liquid crystal panel, and do not characterize the present invention.
- the alignment films 48 and 58 according to the present embodiment will be described with reference to FIG.
- the transparent electrode and the metal wiring (source wiring and gate wiring) arranged on the array substrate 12 are not shown in a simplified manner.
- the common electrode disposed on the CF substrate 11 is not shown.
- an insulating film 44 is formed on the array substrate 12 in the same manner as a general array substrate (for example, the array substrate 212 shown in FIG. 6B).
- a groove portion 45 (typically linear) is formed along the inner wall surface of the seal portion 16 and along the inner wall surface of the seal portion 16.
- An alignment film 48 having a predetermined thickness (typically several tens of nm) is formed on the insulating film 44, and the alignment film 48 faces the liquid crystal layer 13.
- An end portion of the alignment film 48 reaches the inside of the groove portion 45, and a barrier portion 49 thicker than the film thickness of the alignment film 48 is formed at the end portion. That is, the barrier portion 49 is formed thicker than the above-described thickness by storing the alignment film constituent material in the groove portion 45, and is integrated integrally with the alignment film 48.
- the CF substrate 11 includes three color filters 52 of R, G, and B, and a black matrix 54 surrounding the outer periphery thereof, as in a general CF substrate (for example, the CF substrate 211 shown in FIG. 6B). And are formed.
- the seal portion 16 is adjacent to the outer side of the black matrix 54 at the peripheral edge portion of the CF substrate 11.
- the black matrix 54 specifically, the black matrix 54 and the common electrode formed on the black matrix 54
- a (typically linear) groove 55 is formed.
- a predetermined thickness is provided on the color filter 52 and the black matrix 54 (strictly speaking, on the surface of the common electrode formed on the color filter 52 and the black matrix 54), like the alignment film 48 of the array substrate 12, a predetermined thickness is provided.
- the alignment film 58 is formed and faces the liquid crystal layer 13 so that the alignment film 58 faces the alignment film 48.
- An end portion of the alignment film 58 reaches the inside of the groove portion 55, and a barrier portion 59 thicker than the film thickness of the alignment film 58 is integrally formed at the end portion.
- FIG. 4A is a cross-sectional view schematically showing a peripheral portion (peripheral portion 10a of the liquid crystal panel 10) of the array substrate 12 according to the present embodiment.
- FIG. 4B is a plan view schematically showing a peripheral portion (peripheral portion 10a of the liquid crystal panel 10) of the array substrate 12 according to the present embodiment.
- FIG. 5A is a cross-sectional view schematically showing a peripheral portion of the array substrate 212 in the conventional liquid crystal panel 210.
- FIG. 5B is a plan view schematically showing a peripheral portion of the array substrate 212 in the conventional liquid crystal panel 210.
- the metal wiring and the pixel electrode (transparent electrode) are not shown.
- the metal wiring 242 and the pixel electrode (transparent electrode) 246 are not shown.
- photolithography is employed as a suitable method for forming the array substrate 12 by forming an array of TFTs on a glass substrate. In this method, first, a metal film for gate wiring (gate electrode) is formed on the surface of one glass substrate, and a photosensitive agent (resist) is applied thereon. Further, a mask patterned with an electronic circuit is placed thereon (mask alignment), and light (typically ultraviolet rays) is irradiated from above to perform exposure.
- gate electrode a metal film for gate wiring
- resist photosensitive agent
- a mask patterned with an electronic circuit is placed thereon (mask alignment), and light (typically ultraviolet rays) is irradiated from above to perform exposure.
- the exposed glass substrate is developed, and etching is performed along a pattern formed by the development, thereby forming a gate electrode.
- the insulating film 44 formed on the gate electrode includes a gate insulating film, a surface protective film (passivation film), and an organic insulating film), source wiring not shown, transparent electrodes, etc. Then, the same method as that for the gate electrode is repeated to sequentially form (stack) on the gate electrode.
- the insulating film 44 (strictly speaking, further, by further patterning so that a groove-like depression is formed at a predetermined position that can be near the inside of the seal portion 16. The groove 45 can be easily formed on the transparent electrode). As described above, the array substrate 12 before the alignment film 48 is formed is obtained.
- an inkjet method can be preferably used as a method of forming the alignment film 48 on the insulating film 44 in which the groove 45 is formed.
- an alignment film constituent material is prepared.
- Such a material may be the same as the conventional alignment film constituting material, and examples thereof include polymer materials such as polyvinyl alcohol (PVA), polyamide, polyimide, polyimide amide, and the like, and a polyimide material is preferable.
- PVA polyvinyl alcohol
- polyamide polyamide
- polyimide polyimide amide
- polyimide amide polyimide amide
- a polyimide material is preferable.
- a material having a high cross-linking structure, a linear structure and a highly symmetrical molecular structure and a high imidization rate is more preferable because it provides good orientation.
- the alignment film constituent material is mounted on an ink jet apparatus, and the alignment film constituent material is placed on the array substrate 12 from each nozzle while relatively moving, for example, an inkjet head having a plurality of nozzles arranged at a predetermined pitch.
- Apply discharge
- the alignment film constituent material discharged in the form of dots adheres to the array substrate 12, each dot spreads so that a part of adjacent dots overlap each other.
- the alignment film constituent material is deposited on the array substrate 12. It spreads in the same manner to form a film.
- the alignment film constituent material is discharged so as to be stored inside the groove 45. However, it is preferable to discharge the alignment film constituent material so as not to cross the outer edge of the groove 45 (that is, the seal portion 16 side).
- the surface of the film thus formed on the array substrate 12 is aligned by performing a rubbing process (for example, a process of rubbing the film along a predetermined direction with a cloth) for controlling the alignment of liquid crystal molecules.
- a film 48 is formed. Note that the necessity of performing the rubbing process is not particularly limited.
- the liquid crystal panel 10 according to the present embodiment is a panel classified into, for example, a VA (Vertical Alignment) method using a vertical alignment film, the rubbing process as described above may not be performed.
- the alignment film constituent material is stored in the groove portion 45 formed on the array substrate 12 and other regions are stored.
- a barrier portion 49 having a thickness greater than that of the alignment film 48 is formed continuously and integrally with the alignment film 48.
- the (outer) end portion of the barrier portion 49 that is, the outer boundary line, extends along the groove portion 45 without extending outside the groove portion 45 over almost the entire circumference of the panel 10. It fits in the groove part 45 so that it may become linear form.
- the barrier portion 49 is separated from the seal portion 16 by a predetermined distance (that is, a distance between the inner wall of the seal portion 16 and the groove portion 45) over almost the entire periphery of the panel 10, and the barrier portion 49 is separated from the seal portion 16. Contact is reliably avoided.
- the dashed-two dotted line in FIG. 4B has shown the position where the seal
- a black matrix 54 serving as a frame surrounding each color filter 52 is first formed on a glass substrate in a lattice shape, typically by photolithography.
- an R (red) pigment dispersion resist resist material obtained by dispersing a red pigment in a transparent resin
- a mask is formed.
- the pattern of the R color filter is printed by aligning and exposing.
- development is performed to form R sub-pixels (color filters) in a predetermined pattern.
- the G (green) and B (blue) color filters are formed in the same manner. Thereafter, a conductive film (typically an ITO film) to be a transparent electrode (common electrode) is formed on the color filter 52 and the black matrix 54 by, for example, sputtering or photolithography.
- a conductive film typically an ITO film to be a transparent electrode (common electrode) is formed on the color filter 52 and the black matrix 54 by, for example, sputtering or photolithography.
- the CF substrate 11 before forming the alignment film 58 is obtained as described above.
- the groove part 55 is formed by forming a transparent electrode film by applying a conductive film material (typically ITO) to such an extent that the recess is not filled.
- a conductive film material typically ITO
- the method of forming the alignment film 58 on the CF substrate 11 in which the groove 55 is formed may be the same as the method of forming the alignment film 48 on the array substrate 12.
- the barrier portion 59 in which the alignment film constituent material is stored in the groove portion 55 and becomes thicker than the film thickness in the other regions is different from the alignment film 58. It is formed continuously and integrally. Further, the (outer) end portion of the barrier portion 59, that is, the outer boundary line, is formed in a straight line along the groove portion 55 so as not to extend outward from the groove portion 55 over almost the entire periphery of the panel 10. It is within. For this reason, the barrier portion 59 is separated from the seal portion 16 in the same manner as the barrier portion 49, and contact with the seal portion 16 is avoided.
- the array substrate 12 on which the alignment film 48 and the barrier portion 49 are formed is bonded to the CF substrate 11 on which the alignment film 58 and the barrier portion 59 are formed (see FIG. 3). That is, the seal portion 16 is formed by applying a seal material (for example, a seal adhesive made of a thermosetting resin or an ultraviolet curable resin) so as to surround the peripheral portion of the array substrate 12. Next, spacers (not shown) for creating a gap (gap) between the array substrate 12 and the CF substrate 11 are dispersed. Thereafter, the CF substrate 11 is laminated on the array substrate 12 so that the sides on which the alignment films 48 and 58 are formed face each other.
- a seal material for example, a seal adhesive made of a thermosetting resin or an ultraviolet curable resin
- the pair of substrates 11 and 12 bonded together is kept in vacuum, and a liquid crystal material is injected into the gap between the substrates by capillary action. Then, after filling the gap with a liquid crystal material, the inlet is sealed. Finally, polarizing plates 17 and 18 (see FIG. 2) are attached to the respective surfaces of the substrates 11 and 12 that are not opposed to each other. In this way, the liquid crystal panel 10 is completed.
- the barrier portions 49 and 59 formed integrally with the end portions of the alignment films 48 and 58 in the pair of substrates 11 and 12 exhibit the following effects.
- the size (thickness) of the barrier portions 49 and 59 is a volume corresponding to an amount at which all of the infiltrated moisture can be reacted (trapped).
- the groove portions 45 and 55 are formed by adjusting the width and depth of the groove portions 45 and 55 so that the barrier portions 49 and 59 are formed in a preferable size. Further, since the barrier portions 49 and 59 and the seal portion 16 are separated from each other, the moisture can be prevented from coming into direct contact with the barrier portions 49 and 59 through the seal portion 16. Thereby, since it can suppress that the said water
- the case of the conventional liquid crystal panel 210 will be described using the array substrate 212 shown in FIG. 5A.
- the array substrate 212 is not formed with a depression like the groove 45, and the panel 210 is not provided with a thick barrier portion made of an alignment film material.
- the liquid crystal panel 210 for example, there is no portion that traps moisture that has been exposed to a high-temperature and high-humidity atmosphere as described above and has entered the inside of the seal portion 216. It is impossible to prevent moisture from entering the alignment film 248).
- the film 248 since the depression like the groove 45 is not formed, when an alignment film constituent material for forming the alignment film 248 is applied on the array substrate 212 (typically by an ink jet method), the film It is difficult to separate the end portion of the panel from the seal portion 216 by controlling it linearly over the entire periphery of the panel. For this reason, as shown in FIG. 5B, a part of the applied alignment film 248 made of the alignment film constituent material (strictly, a coating film formed by applying the alignment film constituent material) contacts the seal portion 216. There is a fear. The contact between the alignment film 248 and the seal portion 216 is not preferable because it can promote the penetration of moisture in the external atmosphere.
- the dashed-two dotted line in FIG. 5B has shown the position where the seal
- the liquid crystal panel 10 can provide a liquid crystal panel that provides good quality by preventing deterioration in display quality due to generation of spots (clouding) in the active area 10b that may be caused by the reaction between the alignment film constituent material and moisture. .
- the groove portions 45 and 55 are provided in the vicinity of the inside of the seal portion 16 in order to form the barrier portions 49 and 59 that are thicker than the film thickness of the alignment films 48 and 58.
- the barrier portion is provided on at least one of the substrates and protrudes in a protruding shape (or wall shape) toward the opposite substrate. The structure which provided the barrier part thicker than an alignment film by this may be sufficient.
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Abstract
Description
また、上記ガラス基板には、上記液晶層における液晶分子をある一定の方向に配向させるために、樹脂材料(典型的にはポリイミド)からなる配向膜が形成されている。
しかしながら、特許文献1および2に記載の技術では、上記のような高温高湿雰囲気中に曝された状態での液晶パネルの基板間に浸入する水分を完全に防ぐことは困難である。
本発明に係る液晶パネルでは、上記シール部の内側においてそのシール部の近傍に上記バリア部が形成されることにより、外部雰囲気中の水分が上記シール部と基板との間を通って該シール部の内側(すなわち液晶層内)にたとえ浸入したとしても、該水分(換言すれば水の分子)をバリア部においてトラップすることができる。すなわち、かかる浸入水分(H2O分子)を上記バリア部を構成する配向膜構成材料分子(高分子化合物)と反応させ、バリア部よりさらに内側に水分が浸入することを防止することができる。好ましくは、上記一対の基板間に浸入し得る水分量の全てをトラップし得る体積の上記バリア部を設けておく。このことにより、浸入し得る水分が上記バリア部で反応する(消費される)ため、かかる水分の浸入を上記バリア部で阻止し、該バリア部よりも内側のアクティブエリアにまで浸入することを効果的に防止することができる。
したがって、本発明に係る液晶パネルによると、該液晶パネルの一対の基板の間隙内に外部雰囲気の水分が浸入しても、アクティブエリアへの浸入に伴って発生し得るシミ等の表示品位の低下を高い次元で防止することができる。
かかる構成の液晶パネルでは、上記シール部(シール材)の内側に沿って(好ましくは該シール部から所定距離だけ内側に向けて離隔するように)形成された溝部に配向膜構成材料を貯留することによって、配向膜よりも肉厚なバリア部を容易に形成することができる。したがって、かかる構成の液晶パネルによると、肉厚なバリア部によってシール部内側に浸入してきた水分を充分にトラップすることができる。
かかる構成の液晶パネルによると、バリア部を構成するポリイミドが容易に水分(H2O分子)と反応し得るため、効率よくバリア部で浸入水分をトラップさせることができる。したがって、上記水分の浸入による表示品位の低下をより一層高い次元で防止することができる。
かかる構成の液晶パネルでは、従来の配向膜形成プロセス(例えばインクジェット方式による配向膜形成プロセス)によって上記配向膜構成材料を上記基板表面に付与することにより、配向膜とバリア部とが一体に形成される。このため、バリア部の形成に伴う製造プロセスの煩雑化や製造コストの増大を抑えつつ水分浸入を防止して表示品位を維持することができる。
このようにバリア部の外側境界線(すなわちバリア部の幅方向のパネル外側の端部)をパネル全周にわたって直線状に形成することにより、水分浸入阻止能力(バリア部における水分トラップ能力)をパネルの全周にわたってほぼ均等にすることができる。このため、本構成の液晶パネルによると、むらが無くパネル全体で安定した水分浸入阻止を実現することができる。
かかる液晶表示装置は、上記のような液晶パネルを備えているので、該液晶パネルの一対の基板の間隙の内部に外部雰囲気の水分が浸入しても、該浸入により生じ得る表示品位の低下を効果的に防止することができる。
なお、以下の図面において、同じ作用を奏する部材、部位には同じ符号を付し、重複する説明は省略または簡略化することがある。また、各図における寸法関係(長さ、幅、厚さ等)は、必ずしも実際の寸法関係を正確に反映するものではない。また、以下の説明において、「表側」とは液晶表示装置100における視聴者に面する側(すなわち液晶パネル側)をいい、「裏側」とは液晶表示装置100における視聴者に面しない側(すなわちバックライト装置側)をいうこととする。
また、ケース24の裏側には、インバータ回路を搭載するための図示しないインバータ回路基板と、各光源22に電力を供給する昇圧回路としての図示しないインバータトランスが設けられているが、本発明を特徴付けるものではないため説明は省略する。
図1~図3に示されるように、液晶パネル10は、概して、全体として矩形の形状を有しており、互いに対向する一対の透光性のガラス基板11,12と、その間に封入された液晶層13とから構成されるサンドイッチ構造を有している。かかる基板11,12には、製造工程でそれぞれマザーガラスと称される大型の母材から切り出されたものを使用している。上記一対の基板11,12のうち、表側がカラーフィルタ基板(CF基板)11であり、裏側がアレイ基板12である。液晶層13は、基板11,12の間の電界印加に伴って光学特性が変化する液晶材料から構成される。基板11および12の周縁部(液晶パネル10における周縁部10a)には、適当な材質(例えば熱硬化性樹脂や光硬化性樹脂)からなるシール材が付与されてシール部16が液晶層13を包囲するように形成されており、該液晶層13を封止している。基板11と基板12との間隙(ギャップ)は、シール部16と図示しない粒形状のスペーサ(典型的には弾性変形可能な樹脂製であって、多数個が分散配置されている)とによって確保される。また、両基板11,12における対向しない側(外側)の面には、それぞれ偏光板17および18が貼り付けられている。
上記両配線は画像信号等を供給可能な外部回路(ドライバーIC)14(図1参照)に接続されている。
図3に示されるように、アレイ基板12には、一般的なアレイ基板(例えば図6Bに示されるアレイ基板212)と同様に絶縁膜44が形成されている。この絶縁膜44には、シール部16の内側近傍であって該シール部16の内側の壁面に沿うように(典型的には直線状の)溝部45が形成されている。
上記絶縁膜44の上には所定厚(典型的には数十nm)の配向膜48が形成されており、該配向膜48が液晶層13に臨んでいる。配向膜48の端部は上記溝部45の内部に至っており、該端部には上記配向膜48の膜厚よりも肉厚なバリア部49が形成されている。すなわち、バリア部49は上記溝部45に配向膜構成材料が貯留されることによって上記膜厚よりも肉厚に形成されており、配向膜48と連続して一体となっている。
上記カラーフィルタ52およびブラックマトリックス54の上(厳密には、カラーフィルタ52およびブラックマトリックス54上に形成された共通電極の表面上)には、上記アレイ基板12の配向膜48と同様に、所定厚の配向膜58が形成されており、該配向膜58が上記配向膜48と対向するように液晶層13に臨んでいる。配向膜58の端部は上記溝部55の内部に至っており、該端部には上記配向膜58の膜厚よりも肉厚なバリア部59が一体的に形成されている。
ガラス基板上にTFTの配列を形成してアレイ基板12を作製する好適な一方法として、フォトリソグラフィが採用される。かかる方法では、まず、1枚のガラス基板の表面にゲート配線(ゲート電極)用の金属膜を形成し、その上に感光剤(レジスト)を塗布する。さらにその上に電子回路をパターニングしたマスクを載せて(マスク合わせ)、その上から光(典型的には紫外線)を照射して露光する。この後、露光された上記ガラス基板を現像して、現像により形成されたパターンに沿ってエッチングを行うことにより、ゲート電極が形成される。このゲート電極上に形成される絶縁膜44(ここで絶縁膜44は、ゲート絶縁膜、表面保護膜(Passivation膜)および有機絶縁膜を含む。)や、図示しないソース配線、透明電極等については、上記ゲート電極と同様の方法を繰り返すことによりゲート電極上に順次形成(積層)する。
かかる方法を用いてアレイ基板12を作製する際に、上記シール部16の内側近傍となり得る所定位置に溝状の窪みが形成されるようにパターニングすることにより、絶縁膜44(厳密には、さらにその上の透明電極)上に溝部45を容易に形成することができる。
以上のようにして、配向膜48形成前のアレイ基板12を得る。
次いで、上記配向膜構成材料をインクジェット装置に搭載し、例えば所定のピッチで配列される複数のノズルを備えたインクジェットヘッドを相対移動させながら各ノズルから上記配向膜構成材料を上記アレイ基板12上に付与(吐出)する。ドット状に吐出された配向膜構成材料は、上記アレイ基板12に付着すると、隣り合うドット同士の一部が重なるように各ドットが拡がり、結果、上記配向膜構成材料はアレイ基板12上に一様に拡がって膜を形成する。ここで、上記配向膜構成材料が上記溝部45の内部に貯留するように吐出する。ただし、該溝部45の外側(すなわちシール部16側)の縁部を越えないように上記配向膜構成材料を吐出することが好ましい。このようにして上記アレイ基板12上に形成された膜の表面に対して、液晶分子の配向を制御するためのラビング処理(例えば布で所定方向に沿って膜を擦る処理)を行うことにより配向膜48を形成する。なお、かかるラビング処理の実施の要否については特に限定されない。本実施形態に係る液晶パネル10が、例えば垂直配向膜を用いたVA(Vertical Alignment)方式に分類されるパネルである場合には、上記のようなラビング処理を実施しなくてもよい。
次いで、上記貼り合わせた一対の上記基板11,12を真空に保ち毛細管現象により液晶材を上記基板間のギャップに注入する。そして、該ギャップ内に液晶材を充填した後に注入口を封止する。最後に、両基板11,12の対向しない側の各面に偏光板17,18(図2参照)を貼る。このようにして液晶パネル10が完成する。
また、バリア部49,59とシール部16とが互いに離隔しているため、上記水分がシール部16を介してバリア部49,59に直接的に接触するのを防ぐことができる。これにより、上記水分がバリア部49,59と反応することが抑制され得るので、より一層効果的に水分の浸入を防止することができる。
10a 周縁部
10b アクティブエリア
11 カラーフィルタ(CF)基板
12 アレイ基板
13 液晶層
14 外部回路
16 シール部
17,18 偏光板
20 バックライト装置
22 光源
24 ケース
26 光学部材
28 フレーム
30 ベゼル
44 絶縁膜
45 溝部
48 配向膜
49 バリア部
52 カラーフィルタ
54 ブラックマトリックス
55 溝部
58 配向膜
59 バリア部
100 液晶表示装置
Claims (6)
- 対向する一対の基板と、
該一対の基板間に配置された液晶層と、
該液晶層を前記一対の基板間に保持するために該液晶層を包囲するように前記基板間の周縁部に配置されたシール部と、
を備える液晶パネルであって、
前記一対の基板の少なくとも一方における前記液晶層に臨む側の表面には、前記液晶層の液晶分子を配向させるための配向膜が形成されており、
ここで、前記シール部の内側近傍に、前記配向膜を構成する材料からなるバリア部が前記配向膜よりも肉厚に形成されていることを特徴とする、液晶パネル。 - 前記基板の液晶層に臨む側の表面には、前記シール部の内側に沿って溝部が形成されており、
該溝部に前記配向膜構成材料が貯留されることによって前記バリア部が形成されていることを特徴とする、請求項1に記載の液晶パネル。 - 前記配向膜構成材料は、ポリイミドであることを特徴とする、請求項1または2に記載の液晶パネル。
- 前記配向膜とバリア部とは、前記配向膜構成材料により前記一対の基板の少なくとも一方の表面に連続して一体的に形成されていることを特徴とする、請求項1~3のいずれかに記載の液晶パネル。
- 前記バリア部の外側境界線はパネルのほぼ全周にわたって直線状に形成されていることを特徴とする、請求項1~4のいずれかに記載の液晶パネル。
- 請求項1~5のいずれかに記載の液晶パネルを備えた液晶表示装置。
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- 2009-09-18 JP JP2010542904A patent/JPWO2010070960A1/ja active Pending
- 2009-09-18 US US13/140,696 patent/US20110255041A1/en not_active Abandoned
- 2009-09-18 CN CN2009801505602A patent/CN102246088A/zh active Pending
- 2009-09-18 EP EP09833265A patent/EP2360513A4/en not_active Withdrawn
- 2009-09-18 RU RU2011129667/28A patent/RU2474852C1/ru not_active IP Right Cessation
- 2009-09-18 BR BRPI0923038A patent/BRPI0923038A2/pt not_active IP Right Cessation
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CN102193254A (zh) * | 2010-06-25 | 2011-09-21 | 友达光电股份有限公司 | 液晶显示面板 |
US20130141677A1 (en) * | 2011-12-02 | 2013-06-06 | Hongjie Wu | LCD, LCD Substrate and LCD Manufacturing Method |
US20130141688A1 (en) * | 2011-12-02 | 2013-06-06 | Jun Wang | LCD, LCD Substrate and LCD Manufacturing Method |
TWI485493B (zh) * | 2012-10-31 | 2015-05-21 | Innocom Tech Shenzhen Co Ltd | 顯示裝置以及顯示器 |
Also Published As
Publication number | Publication date |
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BRPI0923038A2 (pt) | 2015-12-15 |
EP2360513A4 (en) | 2012-07-18 |
JPWO2010070960A1 (ja) | 2012-05-24 |
EP2360513A1 (en) | 2011-08-24 |
RU2011129667A (ru) | 2013-01-27 |
RU2474852C1 (ru) | 2013-02-10 |
US20110255041A1 (en) | 2011-10-20 |
CN102246088A (zh) | 2011-11-16 |
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