WO2011118091A1 - Liquid crystal display device and method of forming light-shielding film - Google Patents

Liquid crystal display device and method of forming light-shielding film Download PDF

Info

Publication number
WO2011118091A1
WO2011118091A1 PCT/JP2010/071805 JP2010071805W WO2011118091A1 WO 2011118091 A1 WO2011118091 A1 WO 2011118091A1 JP 2010071805 W JP2010071805 W JP 2010071805W WO 2011118091 A1 WO2011118091 A1 WO 2011118091A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
shielding film
light
color filter
filter substrate
Prior art date
Application number
PCT/JP2010/071805
Other languages
French (fr)
Japanese (ja)
Inventor
吉澤　武徳
菊池　克浩
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2011118091A1 publication Critical patent/WO2011118091A1/en

Links

Images

Classifications

    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix

Definitions

  • the present invention relates to a liquid crystal display device including a liquid crystal display panel whose periphery is covered with a frame, and a method of forming a light shielding film provided on the liquid crystal display panel.
  • a liquid crystal display device that displays an image or the like using a liquid crystal display panel is used as various display devices such as a television, a mobile phone, and an electronic signboard.
  • This type of liquid crystal display device may display an image with only one sheet, or may display a single image with a plurality of liquid crystal display devices arranged.
  • FIG. 8 is an explanatory diagram schematically showing how one image is displayed by three liquid crystal display devices arranged in a line.
  • the liquid crystal display devices shown in FIG. 8 are of the same type, and are arranged with no gap therebetween.
  • Each liquid crystal display device includes a rectangular liquid crystal display panel having the same size and a frame that covers the periphery of the liquid crystal display panel.
  • One image (for example, a mountain) is displayed using each liquid crystal display panel in each liquid crystal display device.
  • the technique of displaying one image using a plurality of liquid crystal display devices is used in the fields of, for example, electronic signage (digital signage) and large monitors.
  • Narrow width is preferred.
  • a narrow frame may be preferred for various purposes such as weight reduction and design enhancement (for example, , See Patent Document 1).
  • Patent Document 2 can be cited.
  • FIG. 9 is an explanatory diagram schematically showing a cross-sectional structure taken along line A-A ′ of the liquid crystal display device 1P shown in FIG.
  • the liquid crystal display device 1P includes a liquid crystal display panel 2P and a frame (bezel) 3 that covers the periphery of the liquid crystal display panel 2P. Further, a backlight 4 from which light is emitted from the light exit surface 41 is provided on the back side of the liquid crystal display panel 2P.
  • the liquid crystal display panel 2P includes a liquid crystal layer 21, a thin film transistor array substrate 22 facing each other so as to sandwich the liquid crystal layer 21, and a color filter substrate 23.
  • a seal portion 24 that seals the liquid crystal layer 21 between the thin film transistor array substrate 22 and the color filter substrate 23 is provided.
  • the thin film transistor array substrate 22 and the color filter substrate 23 are bonded and bonded to each other through the seal portion 24.
  • the seal portion 24 is formed in a substantially frame shape on the peripheral side of the liquid crystal display panel so as to surround the liquid crystal layer 21.
  • a frame-shaped light shielding film 25 is provided on the inner surface of the color filter substrate 23 on the center side of the liquid crystal display panel 2P with respect to the seal portion 24.
  • the light shielding film 25 is made of a part of a black matrix (not shown) formed on the inner surface of the color filter substrate 23 and is adjacent to the color filter layer 26.
  • the frame 3 that covers the periphery of the liquid crystal display panel 2P is made of a light-shielding material, and is provided so as to cover the front, side, and back of the periphery of the liquid crystal display panel 2P.
  • the frame 3 has a flange 31 that covers the front surface at the periphery of the liquid crystal display panel 2 ⁇ / b> P, that is, the outer surface at the periphery of the color filter substrate 23.
  • the flange 31 is made of a plate-like member that extends straight along the peripheral shape of the color filter substrate 23 and is provided so as to cover the light shielding film 25.
  • the tip of the collar portion 31 is set so as not to exceed the position of the inner peripheral edge of the frame-shaped light shielding film 25 (the position indicated by the alternate long and short dash line B in FIG. 9). That is, the tip of the collar 31 is set so as not to enter the display area S described later.
  • the collar 31 is fixed and positioned with respect to the liquid crystal display panel 2P with the spacer 5 interposed between the collar 31 and the color filter substrate 23.
  • the frame 3 has another light-shielding collar 32 that covers the rear surface of the liquid crystal display panel 2P, that is, the outer surface of the thin film transistor array substrate 22.
  • the tip of the other flange 32 is also set so as not to exceed the position of the inner peripheral edge of the frame-shaped light shielding film 25.
  • polarizing plates 201 and 202 are laminated on the outer surface of the liquid crystal display panel 2P.
  • the light 6 when the light 6 is emitted from the light exit surface 41 of the backlight 4, the light 6 is mainly emitted from the back side of the liquid crystal display panel 2P (that is, outside the thin film transistor array substrate 22). The light is incident on the liquid crystal display panel 2P from the front surface side. Thereafter, the light 6 passes through the liquid crystal layer 21 and the like, and is emitted from the front side of the liquid crystal display panel 2P (that is, the outer surface side of the color filter substrate 23).
  • An image or the like is displayed in the display area S. Note that, on the front side of the liquid crystal display panel 2P (the outer surface side of the color filter substrate 23), the outer area surrounding the display area S is a non-display area where no image or the like is displayed.
  • the light shielding film 25 is not formed outside the seal portion 24 disposed on the inner surface of the color filter substrate 23. That is, there is a portion (region) where the light shielding film 25 is not formed at the periphery (periphery on the inner surface) of the color filter substrate 23. This portion that is not shielded from light is covered with a light-shielding frame 3 (the collar 31).
  • the collar portion 31 of the frame 3 has the light shielding film 25 of the liquid crystal display panel 2P.
  • the amount of covering may deviate from the design value (see FIG. 9). That is, due to the tolerance, the tip position of the collar portion 31 inevitably exceeds the position of the inner peripheral edge of the light shielding film 25 (the position of the dashed line B in FIG. 9). The position may be away from the position of the inner peripheral edge of the light shielding film 25 (the position of the dashed line B in FIG. 9).
  • the frame 3 is assembled to the liquid crystal display panel 2P with care so that the tip position of the collar portion 31 does not enter the display region S. Therefore, the tip position of the collar portion 31 is mainly designed. A problem arises when the value moves away from the value.
  • FIG. 10 is an explanatory view schematically showing a cross-sectional structure of a conventional liquid crystal display device 1P in which the frame 3 is assembled to the liquid crystal display panel 2P with a deviation from the design value.
  • the position of the frame 3 is shifted outward from that of the liquid crystal display device 1P shown in FIG. 9 due to the assembly tolerance. Therefore, the tip position of the collar part 31 shown in FIG. 10 is shifted to the outside from that shown in FIG. 9, and the light shielding film 25 is almost not covered by the collar part 31.
  • the liquid crystal display of the outer portion (for example, the seal portion 24) of the light shielding film 25 that is not covered with the light shielding film 25 As shown in FIG. 10, when the light shielding film 25 is exposed from the lower side of the flange portion 31, the liquid crystal display of the outer portion (for example, the seal portion 24) of the light shielding film 25 that is not covered with the light shielding film 25.
  • the light 7 that has passed through the panel 2P is not shielded by the collar 31 or the like, and may leak out from the gap between the liquid crystal display panel 2P and the frame 3 (the collar 31).
  • the width of the light shielding film 25 is usually set to be narrow (thin) so that the non-display area can be narrowed as much as possible.
  • the width of the light shielding film 25 is narrow, the light shielding film 25 is immediately exposed when the position of the frame 3 (the flange 31) is shifted due to the assembly tolerance or the like, and the liquid crystal display panel 2P and the frame The light 7 leaks out from the gap with 3 (the flange 31), which is a problem.
  • the light 7 as described above appears as streak-like light (bright lines) along the outer edge of the display area S (frame-shaped light shielding film 25).
  • this light 7 appears, the original image etc. displayed in the display area S by the light 7 interfere, and the quality of the image etc. may be impaired, which is a problem.
  • the problem to be solved by the present invention is to provide a liquid crystal display device in which streaky light is prevented from leaking to the display surface side between the liquid crystal display panel and a frame covering the periphery thereof.
  • Another problem to be solved by the present invention is to provide a method for efficiently forming a highly durable frame-shaped light-shielding film at a predetermined location on the outer surface of a liquid crystal display panel.
  • the liquid crystal display device is as follows. ⁇ 1> A thin film transistor array substrate bonded via a seal portion that encloses and seals the liquid crystal layer so as to face each other across the liquid crystal layer, and a color filter substrate, and the color filter substrate includes the seal portion An inner light shielding film having a frame shape on the inner surface on the center side, and when the outer surface side of the thin film transistor array substrate receives light, the inner peripheral edge of the inner light shielding film is formed on the outer surface side of the color filter substrate.
  • a liquid crystal display panel in which a display area whose outline is determined according to the shape appears, and a frame having a light-shielding collar that covers a peripheral edge on the outer surface side of the color filter substrate so as not to hide the display area
  • the color filter substrate is opposed to the frame-shaped inner light-shielding film on the outer surface thereof, and to the outside of the outer peripheral edge of the inner light-shielding film. It has a wide frame-shaped outer light shielding film.
  • an outer surface of the color filter substrate is a surface of a glass plate, and the outer light-shielding film is surfaced in a frame shape by an oxidation flame treatment and a silicic acid flame treatment.
  • the gist is that it is formed on the surface of the treated glass plate.
  • the gist is that a polarizing plate is laminated on an outer surface of the color filter substrate so as not to overlap with the surface-treated portion in the frame shape.
  • the frame-shaped inner light-shielding film is a part of a black matrix formed on an inner surface of the color filter substrate. It consists of the following.
  • the light shielding film forming method according to the present invention is as follows. ⁇ 5> A thin film transistor array substrate bonded via a seal portion surrounding the liquid crystal layer so as to face each other across the liquid crystal layer, and a color filter substrate, and the color filter substrate is located on the center side of the seal portion An inner light shielding film having a frame shape on the inner surface of the thin film transistor array. When light is incident from the outer surface side of the thin film transistor array substrate, the inner peripheral edge of the inner light shielding film is formed on the outer surface side of the color filter substrate.
  • the inner side of the seal portion on the inner surface of the color filter substrate In addition to having a light-shielding film on the outer surface, the outer surface also has an outer light-shielding film that faces the inner light-shielding film and spreads further outward. Leakage of streaky light is suppressed.
  • a highly durable frame-shaped light shielding film can be efficiently formed at a predetermined location on the outer surface of the liquid crystal display panel.
  • FIG. 9 is an explanatory diagram schematically showing a cross-sectional structure taken along line A-A ′ of the liquid crystal display device shown in FIG. 8. It is explanatory drawing which represented typically the cross-sectional structure of the conventional liquid crystal display device which shifted
  • FIG. 1 is an explanatory view schematically showing a cross-sectional structure of a liquid crystal display device 1 according to an embodiment.
  • the basic configuration of the liquid crystal display device 1 is the same as that of the conventional liquid crystal display device 1P shown in FIG. 9 and the like.
  • the liquid crystal display device 1 includes a liquid crystal display panel 2 and a peripheral edge of the liquid crystal display panel 2.
  • a covering frame (bezel) 3 is provided.
  • a backlight 4 from which light is emitted from the light exit surface 41 is provided on the back side of the liquid crystal display panel 2.
  • the liquid crystal display panel 2 of the present embodiment is of an active matrix type and is driven by a VA (Virtual Nematic) mode liquid crystal.
  • the liquid crystal display panel 2 includes a liquid crystal layer 21, a thin film transistor array substrate 22 bonded to the liquid crystal layer 21 so as to face each other, and a color filter substrate 23.
  • a seal portion 24 is formed so as to surround the liquid crystal layer 21 sandwiched between the thin film transistor array substrate 22 and the color filter substrate 23.
  • the seal portion 24 is interposed between the inner surface of the thin film transistor array substrate 22 and the inner surface of the color filter substrate 23 to bond these substrates 22 and 23 together.
  • a plurality of thin film transistors (not shown) as switching elements and a plurality of pixel electrodes (not shown) respectively corresponding to the thin film transistors are arranged in a matrix on a glass plate. It consists of things.
  • Each thin film transistor or the like corresponds to one pixel and is provided on the inner surface side of the thin film transistor array substrate 22 which is the side facing the liquid crystal layer 21.
  • a plurality of gate lines (not shown) and a plurality of source lines (not shown) are further arranged on the inner surface side of the thin film transistor array substrate 22 so as to cross each other.
  • a terminal (not shown) connected to the line is provided at the end of the thin film transistor array substrate 22.
  • a liquid crystal driver (not shown) is connected to this terminal.
  • the color filter substrate 23 includes a plurality of color filter layers 26 corresponding to each pixel, a grid-like black matrix (not shown) surrounding these color filter layers, a color filter layer 26 and a black matrix on a glass plate. And a transparent common electrode (not shown) is provided.
  • the color filter layer 26 and the like are provided on the inner surface side of the color filter substrate 23 that is the side facing the liquid crystal layer 21.
  • a frame-shaped light shielding film (inner light shielding film) 25 surrounding the display region S composed of a plurality of pixels is formed.
  • the light shielding film 25 is formed together with the black matrix. That is, it is manufactured by the same light-shielding material and manufacturing method as the black matrix.
  • the light shielding film 25 is provided on the inner side of the color filter substrate 23 on the center side of the seal portion 24 along the inner peripheral edge of the frame-shaped seal portion 24.
  • the width of the light shielding film 25 is set to be substantially constant.
  • the material and manufacturing method of the light-shielding film 25 may be different from the black matrix that divides each color filter layer in a lattice pattern.
  • a frame-shaped light shielding film (outer light shielding film) 8 is formed on the outer surface of the color filter substrate 23 .
  • the light shielding film 8 faces the frame-shaped light shielding film (inner light shielding film) 25 provided on the inner surface of the color filter substrate 23 via the color filter substrate (glass plate) 23, and It is set to spread to the outside from the outer peripheral edge.
  • FIG. 2 is an explanatory view schematically showing a state where the light shielding film 8 is formed on the outer surface of the color filter substrate 23.
  • the light shielding film 8 has a frame shape that surrounds the display region S when the color filter substrate (glass plate) 23 is viewed in plan from the outer surface side.
  • the light shielding film 8 is preferably provided on the color filter substrate 23 so that the inner peripheral edge 81 does not enter the display region S.
  • the position of the outer peripheral edge 82 of the light shielding film 8 is outside the position of the outer peripheral edge of the light shielding film 25. As shown in FIG.
  • the width of the light shielding film (outer light shielding film) 8 is set to be substantially constant.
  • the thickness of the light shielding film 8 is not particularly limited as long as the object of the present invention can be achieved.
  • the light-shielding film (outer light-shielding film) 8 is not particularly limited as long as it has a light-shielding property capable of achieving the object of the present invention and is fixed on the outer surface of the color filter substrate (glass plate).
  • the light-shielding film 8 is made of, for example, a light-shielding ink based on an ultraviolet curable epoxy resin in a predetermined shape (frame shape) at a predetermined location on the outer surface of the color filter substrate 23 using a screen printing method. It is obtained by printing and irradiating the printed matter (coating film) with ultraviolet rays to cure the printed matter.
  • a light shielding film forming method described later in which the light shielding film 8 is formed after the surface treatment of the color filter substrate 23 is preferable.
  • the color of the light shielding film 8 is not particularly limited, and may be set according to the color of the frame 3 (the collar part 31), for example.
  • the light shielding film 8 of the present embodiment is formed on the outer surface of the color filter substrate 23 as a continuous and continuous frame shape.
  • the continuous light-blocking light-shielding film 8 is not necessarily required depending on the required degree of light leakage suppression.
  • a spacer (not shown) is interposed between the thin film transistor array substrate 22 and the color filter substrate 23, and the substrates 22 and 23 are kept at a constant interval.
  • polarizing plates 201 and 202 are laminated on the outer surface of the thin film transistor array substrate 22 and the outer surface of the color filter substrate 23, respectively. These polarizing plates 201 and 202 are arranged so as to be crossed Nicols. The end of the polarizing plate 202 on the color filter substrate 23 side is adjacent to the inner peripheral edge of the light shielding film (outer light shielding film) 8. Although not shown, these polarizing plates 201 and 202 are further laminated with an optical film for adjusting the phase difference.
  • the frame 3 is made of a light-shielding member made of plastic, metal, or the like, and is provided on the periphery of the liquid crystal display panel 2 so as to surround the display area S included in the substantially rectangular liquid crystal display panel 2.
  • the frame 3 according to the present embodiment includes a long flange 31 that covers the front surface of the liquid crystal display panel 2, a long side wall 33 that covers the side surface, and another long flange 32 that covers the rear surface. It consists of.
  • the flange portion 31 and the flange portion 32 are provided so as to extend in a substantially vertical direction from a side wall 33 disposed substantially parallel to the side surface of the liquid crystal display panel 2.
  • the position of the tip of the collar 31 is set so as not to enter the display area S (so as not to hide the display area S).
  • the flange 31 is positioned and fixed with respect to the front surface of the liquid crystal display panel 2 (the outer surface of the color filter substrate 23) via the spacer 5.
  • the positions of the tips of the other collars 32 are also set so as not to enter the display area S.
  • the flange portion 32 is positioned and fixed with respect to the back surface (thin film transistor array substrate 22) of the liquid crystal display panel 2 via the spacer 51.
  • the backlight 4 is fixed to the collar portion 32 of the frame 3.
  • the light 6 When the light 6 is emitted from the light exit surface 41 of the backlight 4, the light 6 is mainly transmitted from the back side of the liquid crystal display panel 2 (the outer surface side of the thin film transistor array substrate 22) in the liquid crystal display panel 2 as in the conventional case. Is incident on. Thereafter, the light 6 is emitted from the front side of the liquid crystal display panel 2 (the outer surface side of the color filter substrate 23) as in the conventional case.
  • the tip position of the collar 31 is shifted outside the design value, and the collar 31 does not cover the light shielding film (inner light shielding film) 25.
  • the conventional light leakage does not occur. This is because even if the light 71 passes through a portion (for example, the seal portion 24) of the liquid crystal display panel 2 outside the light shielding film 25, the light shielding film 8 blocks the light 71.
  • the outer peripheral edge 82 of the light shielding film 8 is disposed outside the outer peripheral edge of the light shielding film 25. That is, the light shielding film 8 extends outward from the light shielding film 25.
  • the light shielding film 8 can block the light 71.
  • the position of the inner peripheral edge 81 of the light shielding film 81 is preferably the same as the position of the inner peripheral edge of the light shielding film 25 (the position of the alternate long and short dash line B) or outside of it. As described above, in the liquid crystal display device 1 of this embodiment, light is prevented from leaking from the gap between the liquid crystal display panel 2 and the frame 3.
  • FIG. 3 is an explanatory view schematically showing a cross-sectional structure of a liquid crystal display device 1A according to another embodiment.
  • the outer peripheral edge 82 of the light shielding film (outer light shielding film) 8 formed on the outer surface of the color filter substrate 23 reaches the peripheral edge of the color filter substrate 23.
  • a spacer 5 is disposed on the light shielding film 8, and the collar portion 31 of the frame 8 is positioned and fixed to the color filter substrate 23 using the spacer 5.
  • the other basic configuration of the liquid crystal display device 1A is the same as that of the liquid crystal display difference 1 shown in FIG.
  • the position of the outer peripheral edge 82 of the light shielding film (outer light shielding film) 8 may be adjusted as appropriate as long as the object of the present invention is achieved. Good.
  • This light shielding film forming method forms the light shielding film 8 on the outer surface of the color filter substrate 23 in the liquid crystal display panel 2 shown in FIG.
  • the light shielding film formation method of this embodiment has a surface treatment process, a coating-film formation process, and a shaping process.
  • FIG. 4 is an explanatory view schematically showing a part of the outer surface of the color filter substrate 23 before the light shielding film 8 is formed.
  • a belt-like region L where the light shielding film 8 (see FIG. 1) is to be formed is virtually shown by a broken line.
  • the outer surface of the color filter substrate 23 of this embodiment consists of the surface of a glass plate.
  • FIG. 5 is an explanatory view schematically showing a part of the outer surface of the color filter substrate 23 subjected to the surface treatment. Here, the contents of the surface treatment will be described.
  • the surface treatment is a step of subjecting the outer surface region L of the color filter substrate 23 to an oxidation flame treatment and a silicic acid flame treatment.
  • This surface treatment is intended to modify the outer surface (region L) of the color filter substrate 23 to increase the adhesion between the light shielding film 8 and the outer surface of the color filter substrate 23, and the like.
  • This surface treatment is generally referred to as itro treatment or the like, and its technical content is shown in Patent Document 2 and the like.
  • an oxidation flame treatment is performed on the region L, and then a silicic acid flame treatment is further performed on the region L subjected to the oxidation flame treatment.
  • a burner (not shown) that burns while injecting a mixed gas composed of flammable gas and air from an injection port.
  • a burner (not shown) is used that burns while injecting a mixed gas composed of flammable gas and air from an injection port.
  • organic impurities existing on the surface of the color filter substrate (glass plate) 23 in the region L are oxidized and eliminated. Also, moisture present on the surface is removed.
  • the region L can be appropriately subjected to oxidation flame treatment by, for example, scanning the burner with respect to the color filter substrate 23.
  • a burner (not shown) that burns an air combustion mixed gas containing tetramethoxysilane while being injected from an injection port. Tetramethoxysilane is used by being added to a mixed gas composed of flammable gas and air. A silicic acid flame is injected from the burner used in the silicidation process.
  • silicon oxide is deposited on the region L, and a coating 9 containing silicon is formed. Reactive hydroxyl groups (OH groups) are present on the surface of the film 9.
  • the region L can be appropriately subjected to silicidation treatment by scanning the burner with respect to the color filter substrate 23 or the like.
  • the surface treatment is selectively performed only on the region L where the light shielding film is to be formed on the outer surface of the color filter substrate 23.
  • the polarizing plate 202 (see FIG. 1) once pasted on the outer surface of the color filter substrate 23 may be reworked or the like.
  • the polarizing plate 202 may not be peeled off from the outer surface of the color filter substrate 23 subjected to the surface treatment. Therefore, it is preferable to selectively surface-treat only the region L using the burner or the like.
  • FIG. 6 is an explanatory view schematically showing a part of the outer surface of the color filter substrate 23 on which the coating film 80 that forms the basis of the light shielding film (outer light shielding film) 8 is formed.
  • the coating film 80 is obtained, for example, by applying a coating material that is a base of the light shielding film 8 to the region L using a known coating device such as a knife coater or an ink jet device, and curing the coated material.
  • a coating material that is a base of the light shielding film 8
  • a known coating device such as a knife coater or an ink jet device
  • the paint include an ultraviolet curable resin liquid to which a black pigment such as titanium black or carbon black is added.
  • the paint may be applied only to the region L.
  • the coating film 80 is formed so as to cover at least the surface-treated region L.
  • the coating film 80 shown in FIG. 6 includes a portion that protrudes outside the region L (region M) and a portion that protrudes inside the region L (display region S side).
  • the extra portion can be easily removed for the following reason.
  • the coating film 80 in the region L shown in FIG. 6 has a much higher adhesion to the outer surface of the color filter substrate 23 than the coating films 80 in the other regions M and N.
  • the coating film 80 present in the regions M and N is present on the outer surface of the color filter substrate 23 where the surface treatment is not performed. Therefore, the adhesion force of the coating film 80 existing in these regions M and N to the outer surface of the color filter substrate 23 is smaller than the adhesion force of the coating film 80 in the region L.
  • the excess coating film 80 (the coating film 80 in the regions M and N) is removed by utilizing the difference in adhesion between the coating films 80.
  • a specific method using the difference in adhesion is not particularly limited as long as the coating film in the region L remains and the excess coating film 80 (the coating film 80 in the regions M and N) can be removed.
  • an adhesive tape having an adhesive force that remains in the coating film 80 in the region L is applied so as to cover the cured coating film 80 shown in FIG. 6, and then the adhesive tape is removed and the region is removed.
  • the method of removing the excess coating film 80 which exists in M and N is mentioned.
  • FIG. 7 is an explanatory view schematically showing a part of the outer surface of the color filter substrate 23 on which the light shielding film (outer light shielding film) 8 is formed.
  • the light shielding film 8 obtained through the surface treatment process, the coating film formation process, and the shaping process as described above is efficiently and selectively formed at a desired portion of the color filter substrate 23. Further, the light shielding film 8 has high adhesion to the color filter substrate 23 and is excellent in durability.

Abstract

Provided is a liquid crystal display device which prevents leakage of light in streaks to the display side. The liquid crystal display device (1) includes a liquid crystal display panel (2) and a frame (3). The display panel (2) has a thin-film-transistor array substrate (22) and a color filter substrate (23), which are sealed together by a sealing portion (24) so as to oppose each other with a liquid crystal layer (21) interposed therebetween. The substrate (23) includes a frame-shaped inner light-shielding film (25) which is located on the inner surface to be closer to the center than the sealing portion (24) is. Light impinging upon the outer surface of the substrate (22) can cause a display area (S), the outline of which is defined according to the shape of the inner circumference edge of the inner light-shielding film (25), to appear on the outer surface of the substrate (23). The frame (3) has a light-shielding canopy portion (31) which covers the circumference edge on the outer surface of the substrate (23) so as not to mask the display area (S). The substrate (23) has on the outer surface thereof a frame-shaped outer light-shielding film (8) which opposes the inner light-shielding film (25) and extends more outwardly than the outer circumference edge of the inner light-shielding film (25).

Description

液晶表示装置及び遮光膜形成方法Liquid crystal display device and light shielding film forming method
　本発明は、額縁で周縁が覆われた液晶表示パネルを備える液晶表示装置、及び前記液晶表示パネルに設けられる遮光膜の形成方法に関する。 The present invention relates to a liquid crystal display device including a liquid crystal display panel whose periphery is covered with a frame, and a method of forming a light shielding film provided on the liquid crystal display panel.
　液晶表示パネルを利用して画像等を表示させる液晶表示装置は、テレビ、携帯電話、電子看板等の種々の表示装置として利用されている。この種の液晶表示装置は、それ１枚のみで画像を表示させる場合もあれば、複数枚の液晶表示装置を並べたもので、１つの画像を表示させる場合もある。 A liquid crystal display device that displays an image or the like using a liquid crystal display panel is used as various display devices such as a television, a mobile phone, and an electronic signboard. This type of liquid crystal display device may display an image with only one sheet, or may display a single image with a plurality of liquid crystal display devices arranged.
　図８は、一列に並べられた３枚の液晶表示装置によって１つの画像が表示される様子を模式的に表した説明図である。図８に示される各液晶表示装置は、それぞれ同種のものからなり、互いに隙間無く並べられている。各液晶表示装置は、同じ大きさの矩形状の液晶表示パネルと、この液晶表示パネルの周縁を覆う額縁とを備える。各液晶表示装置における各液晶表示パネルを利用して、１つの画像（例えば、山）が表示されている。このように複数枚の液晶表示装置を利用して１つの画像を表示させる技術は、例えば、電子看板（デジタルサイネージ）、大型モニタ等の分野で利用されている。 FIG. 8 is an explanatory diagram schematically showing how one image is displayed by three liquid crystal display devices arranged in a line. The liquid crystal display devices shown in FIG. 8 are of the same type, and are arranged with no gap therebetween. Each liquid crystal display device includes a rectangular liquid crystal display panel having the same size and a frame that covers the periphery of the liquid crystal display panel. One image (for example, a mountain) is displayed using each liquid crystal display panel in each liquid crystal display device. Thus, the technique of displaying one image using a plurality of liquid crystal display devices is used in the fields of, for example, electronic signage (digital signage) and large monitors.
　ところで、図８等に示されるように、複数枚の液晶表示装置を並べて１つの画像を表示させる場合、各液晶表示装置の額縁としては、画像の繋ぎ目を目立たなくするため等の理由により、幅が細いものが好まれる。 By the way, as shown in FIG. 8 and the like, when displaying one image by arranging a plurality of liquid crystal display devices, as a frame of each liquid crystal display device, for reasons such as making the joint of the images inconspicuous, Narrow width is preferred.
　また、１枚のみで１つの画像を表示させる液晶表示装置においても、軽量化、デザイン性を高める等の種々の目的で、幅の狭い額縁（所謂、狭額縁）が好まれる場合がある（例えば、特許文献１参照）。 Also, in a liquid crystal display device that displays one image with only one sheet, a narrow frame (so-called narrow frame) may be preferred for various purposes such as weight reduction and design enhancement (for example, , See Patent Document 1).
　なお、本願の内容と関連する技術を開示する他の文献としては、例えば、特許文献２が挙げられる。 In addition, as another document disclosing the technique relevant to the content of the present application, for example, Patent Document 2 can be cited.
特開２００９－２９４３７７号公報JP 2009-294377 A 特開２００２－５３９８２号公報JP 2002-53982 A
　液晶表示装置の額縁幅を細く設定した場合等に、液晶表示パネルと、額縁との間からスジ状の光が、液晶表示装置の表示面側に漏れ出すことがあり、問題となっている。以下、図９及び図１０を参照しつつ、スジ状に光が漏れ出す現象について説明する。 When the frame width of the liquid crystal display device is set to be narrow, for example, streaky light may leak from the liquid crystal display panel and the frame to the display surface side of the liquid crystal display device, which is a problem. Hereinafter, a phenomenon in which light leaks in a streak shape will be described with reference to FIGS. 9 and 10.
　図９は、図８に示される液晶表示装置１ＰのＡ－Ａ’線における断面構造を模式的に表した説明図である。図９に示されるように、液晶表示装置１Ｐは、液晶表示パネル２Ｐと、この液晶表示パネル２Ｐの周縁を覆う額縁（ベゼル）３とを備える。また、液晶表示パネル２Ｐの背面側には、出光面４１から光が出射されるバックライト４が備えられている。 FIG. 9 is an explanatory diagram schematically showing a cross-sectional structure taken along line A-A ′ of the liquid crystal display device 1P shown in FIG. As shown in FIG. 9, the liquid crystal display device 1P includes a liquid crystal display panel 2P and a frame (bezel) 3 that covers the periphery of the liquid crystal display panel 2P. Further, a backlight 4 from which light is emitted from the light exit surface 41 is provided on the back side of the liquid crystal display panel 2P.
　液晶表示パネル２Ｐは、液晶層２１と、この液晶層２１を挟むように互いに向かい合う薄膜トランジスタアレイ基板２２と、カラーフィルタ基板２３とを備える。液晶層２１の周囲には、液晶層２１を、薄膜トランジスタアレイ基板２２と、カラーフィルタ基板２３との間で封止するシール部２４が設けられている。また、薄膜トランジスタアレイ基板２２と、カラーフィルタ基板２３とは、このシール部２４を介して互いに接着され、貼り合わせられている。シール部２４は、液晶層２１の回りを囲むように、液晶表示パネルの周縁側において略枠状に形成されている。このシール部２４よりも、液晶表示パネル２Ｐの中央側のカラーフィルタ基板２３の内表面上に、枠状の遮光膜２５が設けられている。なお、この遮光膜２５は、カラーフィルタ基板２３の内表面上に形成されるブラックマトリックス（不図示）の一部からなり、カラーフィルタ層２６と隣接している。 The liquid crystal display panel 2P includes a liquid crystal layer 21, a thin film transistor array substrate 22 facing each other so as to sandwich the liquid crystal layer 21, and a color filter substrate 23. Around the liquid crystal layer 21, a seal portion 24 that seals the liquid crystal layer 21 between the thin film transistor array substrate 22 and the color filter substrate 23 is provided. In addition, the thin film transistor array substrate 22 and the color filter substrate 23 are bonded and bonded to each other through the seal portion 24. The seal portion 24 is formed in a substantially frame shape on the peripheral side of the liquid crystal display panel so as to surround the liquid crystal layer 21. A frame-shaped light shielding film 25 is provided on the inner surface of the color filter substrate 23 on the center side of the liquid crystal display panel 2P with respect to the seal portion 24. The light shielding film 25 is made of a part of a black matrix (not shown) formed on the inner surface of the color filter substrate 23 and is adjacent to the color filter layer 26.
　図９に示されるように、液晶表示パネル２Ｐの周縁を覆う額縁３は、遮光性の材料からなり、液晶表示パネル２Ｐの周縁における前面、側面及び背面を覆うように設けられている。額縁３は、液晶表示パネル２Ｐの周縁における前面、つまりカラーフィルタ基板２３の周縁における外表面を覆う庇部３１を有する。この庇部３１は、カラーフィルタ基板２３の周縁形状に沿うような真っ直ぐに延びた板状の部材からなり、前記遮光膜２５を覆うように設けられている。ただし、庇部３１の先端は、前記枠状の遮光膜２５の内周縁の位置（図９において一点鎖線Ｂによって示される位置）を越えないように設定されている。つまり、庇部３１の先端が、後述する表示領域Ｓ内に入り込まないように設定されている。なお、庇部３１は、カラーフィルタ基板２３との間にスペーサ５を介在させて前記液晶表示パネル２Ｐに対して固定され、位置決めされる。なお、額縁３は、液晶表示パネル２Ｐの周縁における裏面、つまり薄膜トランジスタアレイ基板２２の周縁における外表面を覆う遮光性の他の庇部３２を有する。この他の庇部３２の先端も、前記枠状の遮光膜２５の内周縁の位置を越えないように設定されている。なお、図９には、液晶表示パネル２Ｐの外表面上には、偏光板２０１，２０２が積層されている。 As shown in FIG. 9, the frame 3 that covers the periphery of the liquid crystal display panel 2P is made of a light-shielding material, and is provided so as to cover the front, side, and back of the periphery of the liquid crystal display panel 2P. The frame 3 has a flange 31 that covers the front surface at the periphery of the liquid crystal display panel 2 </ b> P, that is, the outer surface at the periphery of the color filter substrate 23. The flange 31 is made of a plate-like member that extends straight along the peripheral shape of the color filter substrate 23 and is provided so as to cover the light shielding film 25. However, the tip of the collar portion 31 is set so as not to exceed the position of the inner peripheral edge of the frame-shaped light shielding film 25 (the position indicated by the alternate long and short dash line B in FIG. 9). That is, the tip of the collar 31 is set so as not to enter the display area S described later. The collar 31 is fixed and positioned with respect to the liquid crystal display panel 2P with the spacer 5 interposed between the collar 31 and the color filter substrate 23. The frame 3 has another light-shielding collar 32 that covers the rear surface of the liquid crystal display panel 2P, that is, the outer surface of the thin film transistor array substrate 22. The tip of the other flange 32 is also set so as not to exceed the position of the inner peripheral edge of the frame-shaped light shielding film 25. In FIG. 9, polarizing plates 201 and 202 are laminated on the outer surface of the liquid crystal display panel 2P.
　図９に示される液晶表示装置１Ｐにおいて、バックライト４の出光面４１から光６が出射されると、その光６は、主として、液晶表示パネル２Ｐの背面側（つまり、薄膜トランジスタアレイ基板２２の外表面側）から、液晶表示パネル２Ｐ内に入射される。その後、その光６は液晶層２１等を通過して、液晶表示パネル２Ｐの前面側（つまり、カラーフィルタ基板２３の外表面側）から、出射される。すると、その光６によって、液晶表示パネル２Ｐの前面側（つまり、カラーフィルタ基板２３の外表面側）に、前記枠状の遮光膜２５の内周縁形状に応じて輪郭が定まる表示領域Ｓが現れる。この表示領域Ｓ中に画像等が表示されことになる。なお、液晶表示パネル２Ｐの前面側（カラーフィルタ基板２３の外表面側）において、この表示領域Ｓを囲む外側の領域は、画像等が表示されない非表示領域となっている。 In the liquid crystal display device 1P shown in FIG. 9, when the light 6 is emitted from the light exit surface 41 of the backlight 4, the light 6 is mainly emitted from the back side of the liquid crystal display panel 2P (that is, outside the thin film transistor array substrate 22). The light is incident on the liquid crystal display panel 2P from the front surface side. Thereafter, the light 6 passes through the liquid crystal layer 21 and the like, and is emitted from the front side of the liquid crystal display panel 2P (that is, the outer surface side of the color filter substrate 23). Then, a display region S whose contour is determined by the light 6 on the front side of the liquid crystal display panel 2P (that is, the outer surface side of the color filter substrate 23) according to the inner peripheral shape of the frame-shaped light shielding film 25 appears. . An image or the like is displayed in the display area S. Note that, on the front side of the liquid crystal display panel 2P (the outer surface side of the color filter substrate 23), the outer area surrounding the display area S is a non-display area where no image or the like is displayed.
　図９に示されるように、遮光膜２５は、カラーフィルタ基板２３の内表面上に配置するシール部２４よりも外側には形成されていない。つまり、カラーフィルタ基板２３の周縁（内表面上の周縁）には、遮光膜２５が形成されていない部分（領域）がある。この遮光されていない部分は、遮光性の額縁３（庇部３１）によって覆われている。 As shown in FIG. 9, the light shielding film 25 is not formed outside the seal portion 24 disposed on the inner surface of the color filter substrate 23. That is, there is a portion (region) where the light shielding film 25 is not formed at the periphery (periphery on the inner surface) of the color filter substrate 23. This portion that is not shielded from light is covered with a light-shielding frame 3 (the collar 31).
　ところで、液晶表示パネル２Ｐの外形寸法公差、額縁（ベゼル）３の外形寸法公差、液晶表示パネル２Ｐと額縁３との組み付け公差等によって、額縁３の庇部３１が液晶表示パネル２Ｐの遮光膜２５を覆い隠す量（オーバーラップ量）が、設計値（図９参照）よりもずれてしまうことがある。つまり、前記公差等によって、庇部３１の先端位置が、前記遮光膜２５の内周縁の位置（図９の一点鎖線Ｂの位置）をやむを得ず越えてしまう場合や、反対に、庇部３１の先端位置が、前記遮光膜２５の内周縁の位置（図９の一点鎖線Ｂの位置）から離れてしまう場合もある。なお、通常、庇部３１の先端位置が表示領域Ｓ内に入り込まないように注意して、額縁３は液晶表示パネル２Ｐに対して組み付けられるため、主に、庇部３１の先端位置が、設計値よりも外側に離れてしまう場合が問題となる。 By the way, due to the outer dimension tolerance of the liquid crystal display panel 2P, the outer dimension tolerance of the frame (bezel) 3, the assembling tolerance of the liquid crystal display panel 2P and the frame 3, etc., the collar portion 31 of the frame 3 has the light shielding film 25 of the liquid crystal display panel 2P. The amount of covering (overlap amount) may deviate from the design value (see FIG. 9). That is, due to the tolerance, the tip position of the collar portion 31 inevitably exceeds the position of the inner peripheral edge of the light shielding film 25 (the position of the dashed line B in FIG. 9). The position may be away from the position of the inner peripheral edge of the light shielding film 25 (the position of the dashed line B in FIG. 9). Note that, usually, the frame 3 is assembled to the liquid crystal display panel 2P with care so that the tip position of the collar portion 31 does not enter the display region S. Therefore, the tip position of the collar portion 31 is mainly designed. A problem arises when the value moves away from the value.
　図１０は、設計値よりも外側にずれて額縁３が液晶表示パネル２Ｐに組み付けられている従来の液晶表示装置１Ｐの断面構造を模式的に表した説明図である。この図１０に示されている液晶表示装置１Ｐは、組み付け公差によって、額縁３の位置が、図９に示される液晶表示装置１Ｐのものよりも外側にずれている。その為、図１０に示される庇部３１の先端位置は、図９に示されるものよりも外側にずれており、前記遮光膜２５が庇部３１によって殆ど覆われていない状態となっている。 FIG. 10 is an explanatory view schematically showing a cross-sectional structure of a conventional liquid crystal display device 1P in which the frame 3 is assembled to the liquid crystal display panel 2P with a deviation from the design value. In the liquid crystal display device 1P shown in FIG. 10, the position of the frame 3 is shifted outward from that of the liquid crystal display device 1P shown in FIG. 9 due to the assembly tolerance. Therefore, the tip position of the collar part 31 shown in FIG. 10 is shifted to the outside from that shown in FIG. 9, and the light shielding film 25 is almost not covered by the collar part 31.
　図１０に示されるように、庇部３１の下側から前記遮光膜２５が露出すると、前記遮光膜２５で覆われていない、前記遮光膜２５の外側部分（例えば、シール部２４）の液晶表示パネル２Ｐを通過してきた光７が、庇部３１等で遮光されず、液晶表示パネル２Ｐと、額縁３（庇部３１）との隙間から漏れ出すことがあった。 As shown in FIG. 10, when the light shielding film 25 is exposed from the lower side of the flange portion 31, the liquid crystal display of the outer portion (for example, the seal portion 24) of the light shielding film 25 that is not covered with the light shielding film 25. The light 7 that has passed through the panel 2P is not shielded by the collar 31 or the like, and may leak out from the gap between the liquid crystal display panel 2P and the frame 3 (the collar 31).
　液晶表示装置１Ｐの額縁３の幅を狭く（細く）設定した場合、なるべく非表示領域を狭くできるように、通常、前記遮光膜２５の幅も狭く（細く）設定される。このように、遮光膜２５の幅が狭い場合は、特に、前記組み付け公差等により、額縁３（庇部３１）の位置がずれると前記遮光膜２５が直ぐに露出し、液晶表示パネル２Ｐと、額縁３（庇部３１）との隙間から光７が漏れ出てしまい、問題となっている。 When the width of the frame 3 of the liquid crystal display device 1P is set to be narrow (thin), the width of the light shielding film 25 is usually set to be narrow (thin) so that the non-display area can be narrowed as much as possible. As described above, when the width of the light shielding film 25 is narrow, the light shielding film 25 is immediately exposed when the position of the frame 3 (the flange 31) is shifted due to the assembly tolerance or the like, and the liquid crystal display panel 2P and the frame The light 7 leaks out from the gap with 3 (the flange 31), which is a problem.
　上記のような光７は、表示領域Ｓの外側（枠状の遮光膜２５）の外縁に沿った、スジ状の光（輝線）として現れる。この光７が現れると、その光７によって表示領域Ｓ内に表示される本来の画像等が干渉され、その画像等の品質が損なわれることがあり、問題となっている。 The light 7 as described above appears as streak-like light (bright lines) along the outer edge of the display area S (frame-shaped light shielding film 25). When this light 7 appears, the original image etc. displayed in the display area S by the light 7 interfere, and the quality of the image etc. may be impaired, which is a problem.
　本発明の解決しようとする課題は、液晶表示パネルと、その周縁を覆う額縁との間から、表示面側にスジ状の光が漏れ出すのを抑制した液晶表示装置を提供することである。 The problem to be solved by the present invention is to provide a liquid crystal display device in which streaky light is prevented from leaking to the display surface side between the liquid crystal display panel and a frame covering the periphery thereof.
　本発明の他の解決しようとする課題は、液晶表示パネルの外表面上における所定個所に、耐久性の高い、枠状の遮光膜を効率よく形成する方法を提供することである。 Another problem to be solved by the present invention is to provide a method for efficiently forming a highly durable frame-shaped light-shielding film at a predetermined location on the outer surface of a liquid crystal display panel.
　本発明に係る液晶表示装置は、以下の通りである。
　＜１＞　液晶層を挟んで互いに向かい合うように前記液晶層を囲み封止するシール部を介して貼り合わせられる薄膜トランジスタアレイ基板と、カラーフィルタ基板とを有し、前記カラーフィルタ基板が、前記シール部よりも中央側の内表面上に、枠状の内側遮光膜を含み、前記薄膜トランジスタアレイ基板の外表面側が光を受けると、前記カラーフィルタ基板の外表面側に、前記内側遮光膜の内周縁の形状に応じて輪郭が定まる表示領域が現れる液晶表示パネルと、前記表示領域を隠さないように、前記カラーフィルタ基板の外表面側の周縁を覆う遮光性の庇部を有する額縁と、を備える液晶表示装置であって、前記カラーフィルタ基板が、その外表面上に、前記枠状の内側遮光膜と向かい合い、かつ前記内側遮光膜の外周縁よりも外側まで広がった枠状の外側遮光膜を有することを特徴とする。 The liquid crystal display device according to the present invention is as follows.
<1> A thin film transistor array substrate bonded via a seal portion that encloses and seals the liquid crystal layer so as to face each other across the liquid crystal layer, and a color filter substrate, and the color filter substrate includes the seal portion An inner light shielding film having a frame shape on the inner surface on the center side, and when the outer surface side of the thin film transistor array substrate receives light, the inner peripheral edge of the inner light shielding film is formed on the outer surface side of the color filter substrate. A liquid crystal display panel in which a display area whose outline is determined according to the shape appears, and a frame having a light-shielding collar that covers a peripheral edge on the outer surface side of the color filter substrate so as not to hide the display area In the display device, the color filter substrate is opposed to the frame-shaped inner light-shielding film on the outer surface thereof, and to the outside of the outer peripheral edge of the inner light-shielding film. It has a wide frame-shaped outer light shielding film.
　＜２＞　前記＜１＞に記載の液晶表示装置において、前記カラーフィルタ基板の外表面が、ガラス板の表面からなり、前記外側遮光膜が、酸化炎処理及びケイ酸化炎処理によって枠状に表面処理された部分の前記ガラス板の表面上に形成されることを要旨とする。 <2> In the liquid crystal display device according to <1>, an outer surface of the color filter substrate is a surface of a glass plate, and the outer light-shielding film is surfaced in a frame shape by an oxidation flame treatment and a silicic acid flame treatment. The gist is that it is formed on the surface of the treated glass plate.
　＜３＞　前記＜２＞に記載の液晶表示装置において、前記枠状に表面処理された部分と重ならないように、前記カラーフィルタ基板の外表面上に偏光板が積層されることを要旨とする。 <3> In the liquid crystal display device according to <2>, the gist is that a polarizing plate is laminated on an outer surface of the color filter substrate so as not to overlap with the surface-treated portion in the frame shape. .
　＜４＞　前記＜１＞～＜３＞の何れか１つに記載の液晶表示装置において、前記枠状の内側遮光膜が、前記カラーフィルタ基板の内表面上に形成されるブラックマトリックスの一部からなることを要旨とする。 <4> In the liquid crystal display device according to any one of <1> to <3>, the frame-shaped inner light-shielding film is a part of a black matrix formed on an inner surface of the color filter substrate. It consists of the following.
　本発明に係る遮光膜形成方法は、以下の通りである。
　＜５＞　液晶層を挟んで互いに向かい合うように前記液晶層を囲むシール部を介して貼り合わせられる薄膜トランジスタアレイ基板と、カラーフィルタ基板とを備え、前記カラーフィルタ基板が、前記シール部よりも中央側の内表面上に、枠状の内側遮光膜を有し、前記薄膜トランジスタアレイ基板の外表面側から光が入射されると、前記カラーフィルタ基板の外表面側に、前記内側遮光膜の内周縁の形状に応じて輪郭が定まる表示領域が現れる液晶表示パネルの前記カラーフィルタ基板の外表面上に、前記枠状の内側遮光膜と向かい合い、かつ前記内側遮光膜の外周縁よりも外側まで広がった枠状の外側遮光膜を形成する遮光膜形成方法であって、前記カラーフィルタ基板の外表面を、酸化炎処理及びケイ酸化炎処理によって枠状に表面処理する工程と、前記表面処理された部分を少なくとも覆うように前記外側遮光膜の元となる塗膜を形成する工程と、前記表面処理された部分における前記塗膜の密着力と、前記表面処理されていない部分における前記表面処理された部分からはみ出した前記塗膜の密着力との差を利用して、前記はみ出した前記塗膜を除去して、前記カラーフィルタ基板の外表面上に前記外側遮光膜を形成する工程と、を備える。 The light shielding film forming method according to the present invention is as follows.
<5> A thin film transistor array substrate bonded via a seal portion surrounding the liquid crystal layer so as to face each other across the liquid crystal layer, and a color filter substrate, and the color filter substrate is located on the center side of the seal portion An inner light shielding film having a frame shape on the inner surface of the thin film transistor array. When light is incident from the outer surface side of the thin film transistor array substrate, the inner peripheral edge of the inner light shielding film is formed on the outer surface side of the color filter substrate. A frame extending on the outer surface of the color filter substrate of the liquid crystal display panel in which a display area whose outline is determined according to the shape is opposed to the frame-shaped inner light-shielding film and extending outside the outer peripheral edge of the inner light-shielding film A light shielding film forming method for forming a shaped outer light shielding film, wherein the outer surface of the color filter substrate is surface-treated in a frame shape by an oxidation flame treatment and a silicidation flame treatment A step of forming a coating film as a base of the outer light-shielding film so as to cover at least the surface-treated portion, an adhesion force of the coating film in the surface-treated portion, and the surface treatment Using the difference between the adhesive strength of the coating film protruding from the surface-treated portion in the non-treated portion, the protruding coating film is removed, and the outer light shielding is performed on the outer surface of the color filter substrate. Forming a film.
　本発明の液晶表示装置によれば、薄膜トランジスタアレイ基板とカラーフィルタ基板とが液晶層を囲み封止するシール部を介して貼り合わされた液晶表示パネルにおいて、カラーフィルタ基板の内表面のシール部より内側に遮光膜を有するほか、外表面側にもその内側遮光膜と向かい合い、かつ更に外側に広がる外側遮光膜を有するので、液晶表示パネルと、その周縁を覆う額縁との間から、表示面側にスジ状の光が漏れ出すのが抑制される。 According to the liquid crystal display device of the present invention, in the liquid crystal display panel in which the thin film transistor array substrate and the color filter substrate are bonded together via the seal portion that surrounds and seals the liquid crystal layer, the inner side of the seal portion on the inner surface of the color filter substrate In addition to having a light-shielding film on the outer surface, the outer surface also has an outer light-shielding film that faces the inner light-shielding film and spreads further outward. Leakage of streaky light is suppressed.
　本発明の遮光膜形成方法によれば、液晶表示パネルの外表面上における所定個所に、耐久性の高い、枠状の遮光膜を効率よく形成できる。 According to the light shielding film forming method of the present invention, a highly durable frame-shaped light shielding film can be efficiently formed at a predetermined location on the outer surface of the liquid crystal display panel.
本発明の一実施形態に係る液晶表示装置の断面構造を模式的に表した説明図である。It is explanatory drawing which represented typically the cross-section of the liquid crystal display device which concerns on one Embodiment of this invention. カラーフィルタ基板の外表面上に、遮光膜が形成された状態を模式的に表した説明図である。It is explanatory drawing which represented typically the state by which the light shielding film was formed on the outer surface of a color filter substrate. 本発明の他の実施形態に係る液晶表示装置の断面構造を模式的に表した説明図である。It is explanatory drawing which represented typically the cross-section of the liquid crystal display device which concerns on other embodiment of this invention. 遮光膜を形成する前のカラーフィルタ基板の外表面の一部を、模式的に表した説明図である。It is explanatory drawing which represented typically a part of outer surface of the color filter substrate before forming a light shielding film. 表面処理されたカラーフィルタ基板の外表面の一部を、模式的に表した説明図である。It is explanatory drawing which represented typically a part of outer surface of the color filter board | substrate surface-treated. 遮光膜（外側遮光膜）の元となる塗膜が形成されたカラーフィルタ基板の外表面の一部を、模式的に表した説明図である。It is explanatory drawing which represented typically a part of outer surface of the color filter substrate in which the coating film used as the origin of a light shielding film (outside light shielding film) was formed. 遮光膜（外側遮光膜）が形成されたカラーフィルタ基板の外表面の一部を、模式的に表した説明図である。It is explanatory drawing which represented typically a part of outer surface of the color filter substrate in which the light shielding film (outer light shielding film) was formed. 一列に並べられた３枚の液晶表示装置によって１つの画像が表示される様子を模式的に表した説明図である。It is explanatory drawing which represented typically a mode that one image was displayed by three liquid crystal display devices arranged in a line. 図８に示される液晶表示装置のＡ－Ａ’線における断面構造を模式的に表した説明図である。FIG. 9 is an explanatory diagram schematically showing a cross-sectional structure taken along line A-A ′ of the liquid crystal display device shown in FIG. 8. 設計値よりも外側にずれて額縁が液晶表示パネルに組み付けられている従来の液晶表示装置の断面構造を模式的に表した説明図である。It is explanatory drawing which represented typically the cross-sectional structure of the conventional liquid crystal display device which shifted | deviated outside from the design value and the frame was assembled | attached to the liquid crystal display panel.
　以下、図面を参照しつつ、本発明に係る液晶表示装置の実施形態、及び遮光膜形成方法の実施形態を説明する。なお、本発明は、本明細書に例示する実施形態に限定されるものではない。 Hereinafter, embodiments of a liquid crystal display device and a light shielding film forming method according to the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments exemplified in this specification.
　図１は、一実施形態に係る液晶表示装置１の断面構造を模式的に表した説明図である。液晶表示装置１の基本的な構成は、図９等に示される従来の液晶表示装置１Ｐのものと同様であり、液晶表示装置１は、液晶表示パネル２と、この液晶表示パネル２の周縁を覆う額縁（ベゼル）３とを備える。また、液晶表示パネル２の背面側には、出光面４１から光が出射されるバックライト４が備えられている。 FIG. 1 is an explanatory view schematically showing a cross-sectional structure of a liquid crystal display device 1 according to an embodiment. The basic configuration of the liquid crystal display device 1 is the same as that of the conventional liquid crystal display device 1P shown in FIG. 9 and the like. The liquid crystal display device 1 includes a liquid crystal display panel 2 and a peripheral edge of the liquid crystal display panel 2. A covering frame (bezel) 3 is provided. Further, a backlight 4 from which light is emitted from the light exit surface 41 is provided on the back side of the liquid crystal display panel 2.
　本実施形態の液晶表示パネル２は、アクティブマトリックス方式で、ＶＡ（Ｖｉｒｔｉｃａｌ　Ｎｅｍａｔｉｃ）モードの液晶が駆動されるものからなる。液晶表示パネル２は、液晶層２１と、この液晶層２１を挟んで互いに向かい合うように貼り合わせられる薄膜トランジスタアレイ基板２２と、カラーフィルタ基板２３とを備える。薄膜トランジスタアレイ基板２２とカラーフィルタ基板２３との間で挟まれる液晶層２１の回りを囲むようにシール部２４が形成されている。シール部２４は、薄膜トランジスタアレイ基板２２の内表面と、カラーフィルタ基板２３の内表面との間に介在して、これらの基板２２，２３を互いに接着させている。 The liquid crystal display panel 2 of the present embodiment is of an active matrix type and is driven by a VA (Virtual Nematic) mode liquid crystal. The liquid crystal display panel 2 includes a liquid crystal layer 21, a thin film transistor array substrate 22 bonded to the liquid crystal layer 21 so as to face each other, and a color filter substrate 23. A seal portion 24 is formed so as to surround the liquid crystal layer 21 sandwiched between the thin film transistor array substrate 22 and the color filter substrate 23. The seal portion 24 is interposed between the inner surface of the thin film transistor array substrate 22 and the inner surface of the color filter substrate 23 to bond these substrates 22 and 23 together.
　薄膜トランジスタアレイ基板２２は、ガラス板上に、スイッチング素子としての複数個の薄膜トランジスタ（不図示）と、各薄膜トランジスタにそれぞれ対応させた複数個の画素電極（不図示）とが、それぞれマトリックス状に配置されたものからなる。各薄膜トランジスタ等は、それぞれ１つの画素に対応し、液晶層２１に面する側である薄膜トランジスタアレイ基板２２の内表面側に設けられている。薄膜トランジスタアレイ基板２２の内表面側には、更に、複数本のゲートライン（不図示）と、複数本のソースライン（不図示）とが互いに交差するように配置されている。薄膜トランジスタアレイ基板２２の端部には、前記ラインと接続する端子（不図示）が設けられている。この端子には、液晶ドライバ（不図示）が接続されている。 In the thin film transistor array substrate 22, a plurality of thin film transistors (not shown) as switching elements and a plurality of pixel electrodes (not shown) respectively corresponding to the thin film transistors are arranged in a matrix on a glass plate. It consists of things. Each thin film transistor or the like corresponds to one pixel and is provided on the inner surface side of the thin film transistor array substrate 22 which is the side facing the liquid crystal layer 21. A plurality of gate lines (not shown) and a plurality of source lines (not shown) are further arranged on the inner surface side of the thin film transistor array substrate 22 so as to cross each other. A terminal (not shown) connected to the line is provided at the end of the thin film transistor array substrate 22. A liquid crystal driver (not shown) is connected to this terminal.
　カラーフィルタ基板２３は、ガラス板上に、各画素に対応した複数個のカラーフィルタ層２６と、これらのカラーフィルタ層を囲む格子状のブラックマトリックス（不図示）と、カラーフィルタ層２６及びブラックマトリックスを覆う透明な共通電極（不図示）とが設けられたものからなる。カラーフィルタ層２６等は、液晶層２１に面する側であるカラーフィルタ基板２３の内表面側に設けられている。 The color filter substrate 23 includes a plurality of color filter layers 26 corresponding to each pixel, a grid-like black matrix (not shown) surrounding these color filter layers, a color filter layer 26 and a black matrix on a glass plate. And a transparent common electrode (not shown) is provided. The color filter layer 26 and the like are provided on the inner surface side of the color filter substrate 23 that is the side facing the liquid crystal layer 21.
　カラーフィルタ基板２３の内表面上には、複数個の画素からなる表示領域Ｓを囲む枠状の遮光膜（内側遮光膜）２５が形成されている。本実施形態において、この遮光膜２５は、前記ブラックマトリックスと共に形成されるものである。つまり、ブラックマトリックスと同じ遮光性材料、及び製造方法で製造されるものである。遮光膜２５は、カラーフィルタ基板２３の内表面上において、枠状のシール部２４の内周縁に沿うように、シール部２４よりも中央側に設けられている。本実施形態において、遮光膜２５の幅は、略一定になるように設定されている。他の実施形態においては、遮光膜２５の材料及び製造方法が、各カラーフィルタ層を格子状に区切るブラックマトリックスとは異なっていてもよい。 On the inner surface of the color filter substrate 23, a frame-shaped light shielding film (inner light shielding film) 25 surrounding the display region S composed of a plurality of pixels is formed. In the present embodiment, the light shielding film 25 is formed together with the black matrix. That is, it is manufactured by the same light-shielding material and manufacturing method as the black matrix. The light shielding film 25 is provided on the inner side of the color filter substrate 23 on the center side of the seal portion 24 along the inner peripheral edge of the frame-shaped seal portion 24. In the present embodiment, the width of the light shielding film 25 is set to be substantially constant. In other embodiments, the material and manufacturing method of the light-shielding film 25 may be different from the black matrix that divides each color filter layer in a lattice pattern.
　カラーフィルタ基板２３の外表面上には、枠状の遮光膜（外側遮光膜）８が形成されている。この遮光膜８は、カラーフィルタ基板２３の内表面上に設けられている枠状の遮光膜（内側遮光膜）２５と、カラーフィルタ基板（ガラス板）２３を介して向かい合い、かつ遮光膜２５の外周縁よりも外側まで広がるように設定されている。 On the outer surface of the color filter substrate 23, a frame-shaped light shielding film (outer light shielding film) 8 is formed. The light shielding film 8 faces the frame-shaped light shielding film (inner light shielding film) 25 provided on the inner surface of the color filter substrate 23 via the color filter substrate (glass plate) 23, and It is set to spread to the outside from the outer peripheral edge.
　図２は、カラーフィルタ基板２３の外表面上に、遮光膜８が形成された状態を模式的に表した説明図である。図２に示されるように、遮光膜８は、カラーフィルタ基板（ガラス板）２３を、外表面側から平面視した際、表示領域Ｓを囲むような枠状となっている。この遮光膜８は、その内周縁８１が、表示領域Ｓ内に入り込まないようにカラーフィルタ基板２３上に設けられることが好ましい。なお、図１に示されるように、遮光膜８の外周縁８２の位置は、遮光膜２５の外周縁の位置よりも外側にある。図２に示されるように、遮光膜８の外周縁８２と、カラーフィルタ基板２３の周端部との間には、遮光膜８が形成されていない領域２３１がある。本実施形態において、遮光膜（外側遮光膜）８の幅は、略一定となるように設定されている。遮光膜８の厚みは、本発明の目的が達成できるのであれば、特に制限はない。 FIG. 2 is an explanatory view schematically showing a state where the light shielding film 8 is formed on the outer surface of the color filter substrate 23. As shown in FIG. 2, the light shielding film 8 has a frame shape that surrounds the display region S when the color filter substrate (glass plate) 23 is viewed in plan from the outer surface side. The light shielding film 8 is preferably provided on the color filter substrate 23 so that the inner peripheral edge 81 does not enter the display region S. As shown in FIG. 1, the position of the outer peripheral edge 82 of the light shielding film 8 is outside the position of the outer peripheral edge of the light shielding film 25. As shown in FIG. 2, there is a region 231 where the light shielding film 8 is not formed between the outer peripheral edge 82 of the light shielding film 8 and the peripheral edge of the color filter substrate 23. In the present embodiment, the width of the light shielding film (outer light shielding film) 8 is set to be substantially constant. The thickness of the light shielding film 8 is not particularly limited as long as the object of the present invention can be achieved.
　遮光膜（外側遮光膜）８は、本発明の目的を達成できる遮光性を有し、かつカラーフィルタ基板（ガラス板）の外表面上に固定されるものであれば、特に制限ない。遮光膜８は、例えば、紫外線硬化型のエポキシ樹脂をベースとした遮光性のインクを、スクリーン印刷法を用いて、カラーフィルタ基板２３の外表面上の所定個所において、所定形状（枠状）に印刷し、その印刷物（塗膜）に紫外線を照射して、その印刷物を硬化させることによって得られる。 The light-shielding film (outer light-shielding film) 8 is not particularly limited as long as it has a light-shielding property capable of achieving the object of the present invention and is fixed on the outer surface of the color filter substrate (glass plate). The light-shielding film 8 is made of, for example, a light-shielding ink based on an ultraviolet curable epoxy resin in a predetermined shape (frame shape) at a predetermined location on the outer surface of the color filter substrate 23 using a screen printing method. It is obtained by printing and irradiating the printed matter (coating film) with ultraviolet rays to cure the printed matter.
　なお、遮光膜８を形成する方法としては、カラーフィルタ基板２３を表面処理した後に遮光膜８を形成する後述の遮光膜形成方法が好ましい。遮光膜８の色は、特に制限はなく、例えば、額縁３（庇部３１）の色に合わせて、設定してもよい。 As a method for forming the light shielding film 8, a light shielding film forming method described later in which the light shielding film 8 is formed after the surface treatment of the color filter substrate 23 is preferable. The color of the light shielding film 8 is not particularly limited, and may be set according to the color of the frame 3 (the collar part 31), for example.
　本実施形態の遮光膜８は、カラーフィルタ基板２３の外表面上に、連続した途切れのない枠状のものとして形成されている。なお、要求される光漏れの抑制の程度等によっては、必ずしも連続した途切れのない枠状の遮光膜８である必要はない。 The light shielding film 8 of the present embodiment is formed on the outer surface of the color filter substrate 23 as a continuous and continuous frame shape. The continuous light-blocking light-shielding film 8 is not necessarily required depending on the required degree of light leakage suppression.
　なお、薄膜トランジスタアレイ基板２２と、カラーフィルタ基板２３との間には、図示されないスペーサが介在されており、これらの基板２２，２３間が一定の間隔で保たれている。 A spacer (not shown) is interposed between the thin film transistor array substrate 22 and the color filter substrate 23, and the substrates 22 and 23 are kept at a constant interval.
　図１に示されるように、薄膜トランジスタアレイ基板２２の外表面上と、カラーフィルタ基板２３の外表面上とには、それぞれ偏光板２０１，２０２が積層されている。これらの偏光板２０１，２０２は、クロスニコルとなるように配置されている。カラーフィルタ基板２３側の偏光板２０２は、その端部が遮光膜（外側遮光膜）８の内周縁と隣接している。なお、図示されないが、これらの偏光板２０１，２０２には、位相差を調節するため等の光学フィルムが更に積層されている。 As shown in FIG. 1, polarizing plates 201 and 202 are laminated on the outer surface of the thin film transistor array substrate 22 and the outer surface of the color filter substrate 23, respectively. These polarizing plates 201 and 202 are arranged so as to be crossed Nicols. The end of the polarizing plate 202 on the color filter substrate 23 side is adjacent to the inner peripheral edge of the light shielding film (outer light shielding film) 8. Although not shown, these polarizing plates 201 and 202 are further laminated with an optical film for adjusting the phase difference.
　図１に示されるように液晶表示パネル２の周縁は、額縁３によって覆われている。額縁３は、プラスチック、金属等からなる遮光性の部材からなり、略矩形状の液晶表示パネル２が備える表示領域Ｓの回りを囲むように、液晶表示パネル２の周縁に設けられている。本実施形態の額縁３は、液晶表示パネル２の前面を覆う長尺状の庇部３１と、その側面を覆う長尺状の側壁３３と、その背面を覆う他の長尺状の庇部３２とからなる。庇部３１及び庇部３２は、液晶表示パネル２の側面に対して略平行に配置する側壁３３から略垂直方向に延びるように設けられている。庇部３１の先端の位置は、表示領域Ｓ内に入り込まないように（表示領域Ｓを隠さないように）設定されている。庇部３１は、スペーサ５を介して液晶表示パネル２の前面（カラーフィルタ基板２３の外表面）に対して位置決めされ、固定されている。他の庇部３２の先端の位置も、表示領域Ｓ内に入り込まないように設定されている。庇部３２は、スペーサ５１を介して液晶表示パネル２の背面（薄膜トランジスタアレイ基板２２）に対して位置決めされ、固定されている。なお、額縁３の庇部３２に、バックライト４が固定されている。 As shown in FIG. 1, the periphery of the liquid crystal display panel 2 is covered with a frame 3. The frame 3 is made of a light-shielding member made of plastic, metal, or the like, and is provided on the periphery of the liquid crystal display panel 2 so as to surround the display area S included in the substantially rectangular liquid crystal display panel 2. The frame 3 according to the present embodiment includes a long flange 31 that covers the front surface of the liquid crystal display panel 2, a long side wall 33 that covers the side surface, and another long flange 32 that covers the rear surface. It consists of. The flange portion 31 and the flange portion 32 are provided so as to extend in a substantially vertical direction from a side wall 33 disposed substantially parallel to the side surface of the liquid crystal display panel 2. The position of the tip of the collar 31 is set so as not to enter the display area S (so as not to hide the display area S). The flange 31 is positioned and fixed with respect to the front surface of the liquid crystal display panel 2 (the outer surface of the color filter substrate 23) via the spacer 5. The positions of the tips of the other collars 32 are also set so as not to enter the display area S. The flange portion 32 is positioned and fixed with respect to the back surface (thin film transistor array substrate 22) of the liquid crystal display panel 2 via the spacer 51. The backlight 4 is fixed to the collar portion 32 of the frame 3.
　バックライト４の出光面４１から光６が出射されると、その光６は、従来と同様、主として液晶表示パネル２の背面側（薄膜トランジスタアレイ基板２２の外表面側）から、液晶表示パネル２内に入射される。その後、その光６は、従来と同様、液晶表示パネル２の前面側（カラーフィルタ基板２３の外表面側）から出射される。 When the light 6 is emitted from the light exit surface 41 of the backlight 4, the light 6 is mainly transmitted from the back side of the liquid crystal display panel 2 (the outer surface side of the thin film transistor array substrate 22) in the liquid crystal display panel 2 as in the conventional case. Is incident on. Thereafter, the light 6 is emitted from the front side of the liquid crystal display panel 2 (the outer surface side of the color filter substrate 23) as in the conventional case.
　なお、額縁３と液層表示パネル２との組み付け公差等により、庇部３１の先端位置が設計値よりも外側にずれて、庇部３１が、遮光膜（内側遮光膜）２５を覆わなくなっても、従来のような光漏れは発生しない。何故ならば、遮光膜２５よりも外側の液晶表示パネル２の部分（例えば、シール部２４）を光７１が通過してきても、遮光膜８がその光７１を遮るからである。遮光膜８の外周縁８２は、遮光膜２５の外周縁よりも外側に配置している。つまり、遮光膜８は、遮光膜２５よりも外側に広がっている。その為、上記のように遮光膜２５の外側を光７１が通過してきても、遮光膜８はその光７１を遮ることができる。なお、遮光膜８１の内周縁８１の位置は、遮光膜２５の内周縁の位置と同じ（一点鎖線Ｂの位置）か、それよりも外側であることが好ましい。以上のようにして、本実施形態の液晶表示装置１は、液晶表示パネル２と額縁３との隙間から光が漏れ出ることが抑制される。 It should be noted that due to the assembly tolerance between the frame 3 and the liquid layer display panel 2, the tip position of the collar 31 is shifted outside the design value, and the collar 31 does not cover the light shielding film (inner light shielding film) 25. However, the conventional light leakage does not occur. This is because even if the light 71 passes through a portion (for example, the seal portion 24) of the liquid crystal display panel 2 outside the light shielding film 25, the light shielding film 8 blocks the light 71. The outer peripheral edge 82 of the light shielding film 8 is disposed outside the outer peripheral edge of the light shielding film 25. That is, the light shielding film 8 extends outward from the light shielding film 25. Therefore, even if the light 71 passes outside the light shielding film 25 as described above, the light shielding film 8 can block the light 71. The position of the inner peripheral edge 81 of the light shielding film 81 is preferably the same as the position of the inner peripheral edge of the light shielding film 25 (the position of the alternate long and short dash line B) or outside of it. As described above, in the liquid crystal display device 1 of this embodiment, light is prevented from leaking from the gap between the liquid crystal display panel 2 and the frame 3.
　図３は、他の実施形態に係る液晶表示装置１Ａの断面構造を模式的に表した説明図である。液晶表示装置１Ａは、カラーフィルタ基板２３の外表面上に形成されている遮光膜（外側遮光膜）８の外周縁８２が、カラーフィルタ基板２３の周端部まで達している。そして、遮光膜８上に、スペーサ５が配置され、このスペーサ５を利用して、額縁８の庇部３１がカラーフィルタ基板２３に位置決めされ、固定されている。液晶表示装置１Ａのその他の基本的な構成は、図１に示される液晶表示相違１のものと同様である。この液晶表示装置１Ａのように、遮光膜（外側遮光膜）８の外周縁８２の位置（遮光膜８の幅）は、本発明の目的が達成されるのであれば、適宜、調節されてもよい。 FIG. 3 is an explanatory view schematically showing a cross-sectional structure of a liquid crystal display device 1A according to another embodiment. In the liquid crystal display device 1 </ b> A, the outer peripheral edge 82 of the light shielding film (outer light shielding film) 8 formed on the outer surface of the color filter substrate 23 reaches the peripheral edge of the color filter substrate 23. A spacer 5 is disposed on the light shielding film 8, and the collar portion 31 of the frame 8 is positioned and fixed to the color filter substrate 23 using the spacer 5. The other basic configuration of the liquid crystal display device 1A is the same as that of the liquid crystal display difference 1 shown in FIG. As in the liquid crystal display device 1A, the position of the outer peripheral edge 82 of the light shielding film (outer light shielding film) 8 (the width of the light shielding film 8) may be adjusted as appropriate as long as the object of the present invention is achieved. Good.
　以下、図１と共に、図４～図７を参照しつつ、一実施形態に係る遮光膜形成方法について説明する。 Hereinafter, a method for forming a light shielding film according to an embodiment will be described with reference to FIGS. 4 to 7 together with FIG.
　この遮光膜形成方法は、図１等に示される液晶表示パネル２におけるカラーフィルタ基板２３の外表面上に、遮光膜８を形成するものである。本実施形態の遮光膜形成方法は、表面処理工程、塗膜形成工程、及び整形工程を有する。 This light shielding film forming method forms the light shielding film 8 on the outer surface of the color filter substrate 23 in the liquid crystal display panel 2 shown in FIG. The light shielding film formation method of this embodiment has a surface treatment process, a coating-film formation process, and a shaping process.
　図４は、遮光膜８を形成する前のカラーフィルタ基板２３の外表面の一部を、模式的に表した説明図である。図４には、遮光膜８（図１参照）が形成されるべき帯状の領域Ｌが破線で仮想的に示されている。なお、本実施形態のカラーフィルタ基板２３の外表面は、ガラス板の表面からなる。 FIG. 4 is an explanatory view schematically showing a part of the outer surface of the color filter substrate 23 before the light shielding film 8 is formed. In FIG. 4, a belt-like region L where the light shielding film 8 (see FIG. 1) is to be formed is virtually shown by a broken line. In addition, the outer surface of the color filter substrate 23 of this embodiment consists of the surface of a glass plate.
＜表面処理工程＞
　図５は、表面処理されたカラーフィルタ基板２３の外表面の一部を、模式的に表した説明図である。ここで、表面処理の内容について説明する。 <Surface treatment process>
FIG. 5 is an explanatory view schematically showing a part of the outer surface of the color filter substrate 23 subjected to the surface treatment. Here, the contents of the surface treatment will be described.
　前記表面処理とは、カラーフィルタ基板２３の外表面の領域Ｌを、酸化炎処理及びケイ酸化炎処理する工程である。この表面処理は、カラーフィルタ基板２３の外表面（領域Ｌ）を変性して、遮光膜８と、カラーフィルタ基板２３の外表面との密着力を高めること等を目的とするものである。この表面処理は、一般的には、イトロ処理等と称されており、特許文献２等にその技術内容が示されている。 The surface treatment is a step of subjecting the outer surface region L of the color filter substrate 23 to an oxidation flame treatment and a silicic acid flame treatment. This surface treatment is intended to modify the outer surface (region L) of the color filter substrate 23 to increase the adhesion between the light shielding film 8 and the outer surface of the color filter substrate 23, and the like. This surface treatment is generally referred to as itro treatment or the like, and its technical content is shown in Patent Document 2 and the like.
　前記表面処理では、先ず酸化炎処理が前記領域Ｌに対して施され、その後、酸化炎処理された領域Ｌに対して更に、ケイ酸化炎処理が施される。 In the surface treatment, first, an oxidation flame treatment is performed on the region L, and then a silicic acid flame treatment is further performed on the region L subjected to the oxidation flame treatment.
　前記酸化炎処理には、例えば、引火性ガス及び空気からなる混合ガスを噴射口から噴射させながら燃焼させるバーナ（不図示）が用いられる。カラーフィルタ基板２３の領域Ｌが酸化炎処理されると、その領域Ｌのカラーフィルタ基板（ガラス板）２３の表面上に存在する有機不純物が酸化され、排除される。また、前記表面上に存在する湿気も除去される。前記バーナを、カラーフィルタ基板２３に対して走査させること等によって、前記領域Ｌを適宜、酸化炎処理できる。 For the oxidation flame treatment, for example, a burner (not shown) is used that burns while injecting a mixed gas composed of flammable gas and air from an injection port. When the region L of the color filter substrate 23 is subjected to the oxidation flame treatment, organic impurities existing on the surface of the color filter substrate (glass plate) 23 in the region L are oxidized and eliminated. Also, moisture present on the surface is removed. The region L can be appropriately subjected to oxidation flame treatment by, for example, scanning the burner with respect to the color filter substrate 23.
　前記ケイ酸化処理には、例えば、テトラメトキシシランを含む空気燃焼混合ガスを噴射口から噴射させながら燃焼させるバーナ（不図示）が用いられる。テトラメトキシシランは、引火性ガス及び空気からなる混合ガスに添加されて使用される。ケイ酸化処理で利用される前記バーナからは、ケイ酸化炎が噴射される。酸化炎処理された領域Ｌをケイ酸化処理すると、その領域Ｌ上に酸化ケイ素が堆積し、ケイ素を含む被膜９が形成される。この被膜９の表面には、反応性水酸基（ＯＨ基）が存在している。なお、前記バーナを、カラーフィルタ基板２３に対して走査させること等によって、前記領域Ｌを適宜、ケイ酸化処理できる。 For the silicidation treatment, for example, a burner (not shown) is used that burns an air combustion mixed gas containing tetramethoxysilane while being injected from an injection port. Tetramethoxysilane is used by being added to a mixed gas composed of flammable gas and air. A silicic acid flame is injected from the burner used in the silicidation process. When the region L subjected to the oxidation flame treatment is subjected to silicidation treatment, silicon oxide is deposited on the region L, and a coating 9 containing silicon is formed. Reactive hydroxyl groups (OH groups) are present on the surface of the film 9. The region L can be appropriately subjected to silicidation treatment by scanning the burner with respect to the color filter substrate 23 or the like.
　前記表面処理は、カラーフィルタ基板２３の外表面において、遮光膜を形成したい個所である領域Ｌのみを選択的に、行うことが好ましい。例えば、液晶表示パネル２の表示領域Ｓ内が不必要に表面処理されてしまうと、一旦、カラーフィルタ基板２３の外表面上に貼り付けられた偏光板２０２（図１参照）を、リワーク等の目的で剥がしたい場合に、偏光板２０２を表面処理されたカラーフィルタ基板２３の外表面上から剥がせなくなる場合がある。その為、前記バーナ等を利用して、前記領域Ｌのみを選択的に表面処理することが好ましい。 It is preferable that the surface treatment is selectively performed only on the region L where the light shielding film is to be formed on the outer surface of the color filter substrate 23. For example, if the inside of the display area S of the liquid crystal display panel 2 is unnecessarily surface-treated, the polarizing plate 202 (see FIG. 1) once pasted on the outer surface of the color filter substrate 23 may be reworked or the like. When peeling off for the purpose, the polarizing plate 202 may not be peeled off from the outer surface of the color filter substrate 23 subjected to the surface treatment. Therefore, it is preferable to selectively surface-treat only the region L using the burner or the like.
　以上のように、酸化炎処理及びケイ酸炎処理が施されると、図５に示されるように領域Ｌのみが表面処理され、領域Ｌのみに前記被膜９が形成される。 As described above, when the oxidation flame treatment and the silicate flame treatment are performed, only the region L is surface-treated as shown in FIG.
＜塗膜形成工程＞
　図６は、遮光膜（外側遮光膜）８の元となる塗膜８０が形成されたカラーフィルタ基板２３の外表面の一部を、模式的に表した説明図である。 <Coating film formation process>
FIG. 6 is an explanatory view schematically showing a part of the outer surface of the color filter substrate 23 on which the coating film 80 that forms the basis of the light shielding film (outer light shielding film) 8 is formed.
　前記塗膜８０は、例えば、遮光膜８の元となる塗料を、ナイフコータ、インクジェット装置等の公知の塗布装置を利用して、前記領域Ｌに塗布し、その塗布物を硬化させることによって得られる。前記塗料としては、例えば、チタンブラック、カーボンブラック等の黒色顔料が添加された紫外線硬化型の樹脂液からなる。 The coating film 80 is obtained, for example, by applying a coating material that is a base of the light shielding film 8 to the region L using a known coating device such as a knife coater or an ink jet device, and curing the coated material. . Examples of the paint include an ultraviolet curable resin liquid to which a black pigment such as titanium black or carbon black is added.
　前記領域Ｌのみに前記塗料を塗布することが可能であれば、その領域Ｌのみに塗料を塗布しても良いが、例えば、前記領域Ｌ（の幅）が非常に狭い（細い）場合、その領域Ｌのみに塗料を塗布することは一般的に、困難である。このような場合、図６に示されるように、塗膜８０は、少なくとも前記表面処理された領域Ｌを覆うように形成される。図６に示される塗膜８０は、前記領域Ｌよりも外側にはみ出した部分（領域Ｍ）と、前記領域Ｌよりも内側（表示領域Ｓ側）にはみ出した部分とを含む。このように塗膜８０が余分な部分を含んでいても、本実施形態においては、以下に示す理由によって容易に、余分な部分を除去できる。 If the paint can be applied only to the region L, the paint may be applied only to the region L. For example, when the region L (width) is very narrow (thin) It is generally difficult to apply a paint only to the region L. In such a case, as shown in FIG. 6, the coating film 80 is formed so as to cover at least the surface-treated region L. The coating film 80 shown in FIG. 6 includes a portion that protrudes outside the region L (region M) and a portion that protrudes inside the region L (display region S side). Thus, even if the coating film 80 includes an extra portion, in the present embodiment, the extra portion can be easily removed for the following reason.
＜整形工程＞
　図６に示される領域Ｌ内の塗膜８０は、カラーフィルタ基板２３の外表面に対する密着力が、その他の領域Ｍ及びＮの塗膜８０よりも、非常に高くなっている。領域Ｍ及びＮ内に存在する塗膜８０は、表面処理されていない部分のカラーフィルタ基板２３の外表面上に存在している。その為、これらの領域Ｍ及びＮ内に存在する塗膜８０の、カラーフィルタ基板２３の外表面に対する密着力は、領域Ｌ内における塗膜８０の密着力よりも、小さくなっている。本実施形態においては、この塗膜８０の有する密着力の差を利用して、余分な塗膜８０（領域Ｍ及びＮ内の塗膜８０）を除去する。 <Shaping process>
The coating film 80 in the region L shown in FIG. 6 has a much higher adhesion to the outer surface of the color filter substrate 23 than the coating films 80 in the other regions M and N. The coating film 80 present in the regions M and N is present on the outer surface of the color filter substrate 23 where the surface treatment is not performed. Therefore, the adhesion force of the coating film 80 existing in these regions M and N to the outer surface of the color filter substrate 23 is smaller than the adhesion force of the coating film 80 in the region L. In the present embodiment, the excess coating film 80 (the coating film 80 in the regions M and N) is removed by utilizing the difference in adhesion between the coating films 80.
　前記密着力の差を利用する具体的な方法としては、領域Ｌ内の塗膜が残り、かつ余分な塗膜８０（領域Ｍ及びＮ内の塗膜８０）が除去できれば特に制限はない。
例えば、図６に示される硬化後の塗膜８０を覆うように、領域Ｌ内の塗膜８０は残るような粘着力を備えた粘着テープを貼り付け、その後、その粘着テープを剥がすと共に、領域Ｍ及びＮに存在する余分な塗膜８０を除去する方法が挙げられる。他の方法としては、領域Ｍ及びＮに存在する余分な塗膜８０を、ヘラ等で剥がしとる方法が挙げられる。 A specific method using the difference in adhesion is not particularly limited as long as the coating film in the region L remains and the excess coating film 80 (the coating film 80 in the regions M and N) can be removed.
For example, an adhesive tape having an adhesive force that remains in the coating film 80 in the region L is applied so as to cover the cured coating film 80 shown in FIG. 6, and then the adhesive tape is removed and the region is removed. The method of removing the excess coating film 80 which exists in M and N is mentioned. As another method, there is a method in which the excess coating film 80 existing in the regions M and N is removed with a spatula or the like.
　図７は、遮光膜（外側遮光膜）８が形成されたカラーフィルタ基板２３の外表面の一部を、模式的に表した説明図である。上記のような、表面処理工程、塗膜形成工程、及び整形工程を経て得られる遮光膜８は、カラーフィルタ基板２３の所望の個所に、効率よく選択的に形成される。また、前記遮光膜８は、カラーフィルタ基板２３に対する密着力が高く、耐久性に優れる。 FIG. 7 is an explanatory view schematically showing a part of the outer surface of the color filter substrate 23 on which the light shielding film (outer light shielding film) 8 is formed. The light shielding film 8 obtained through the surface treatment process, the coating film formation process, and the shaping process as described above is efficiently and selectively formed at a desired portion of the color filter substrate 23. Further, the light shielding film 8 has high adhesion to the color filter substrate 23 and is excellent in durability.

Claims (5)

  1. 　液晶層を挟んで互いに向かい合うように前記液晶層を囲み封止するシール部を介して貼り合わせられる薄膜トランジスタアレイ基板と、カラーフィルタ基板とを有し、前記カラーフィルタ基板が、前記シール部よりも中央側の内表面上に、枠状の内側遮光膜を含み、前記薄膜トランジスタアレイ基板の外表面側が光を受けると、前記カラーフィルタ基板の外表面側に、前記内側遮光膜の内周縁の形状に応じて輪郭が定まる表示領域が現れる液晶表示パネルと、
    　前記表示領域を隠さないように、前記カラーフィルタ基板の外表面側の周縁を覆う遮光性の庇部を有する額縁と、を備える液晶表示装置であって、
    　前記カラーフィルタ基板が、その外表面上に、前記枠状の内側遮光膜と向かい合い、かつ前記内側遮光膜の外周縁よりも外側まで広がった枠状の外側遮光膜を有することを特徴とする液晶表示装置。     A thin film transistor array substrate bonded via a seal portion that surrounds and seals the liquid crystal layer so as to face each other across the liquid crystal layer; and a color filter substrate, and the color filter substrate is in the center of the seal portion When the outer surface side of the thin film transistor array substrate receives light, the outer surface side of the color filter substrate has a shape corresponding to the shape of the inner peripheral edge of the inner light shielding film. A liquid crystal display panel in which a display area whose outline is determined is displayed,
    A frame having a light-shielding collar that covers a peripheral edge on the outer surface side of the color filter substrate so as not to hide the display area, and a liquid crystal display device comprising:
    The color filter substrate has, on its outer surface, a frame-shaped outer light-shielding film that faces the frame-shaped inner light-shielding film and extends outward from the outer peripheral edge of the inner light-shielding film. Display device.
  2. 　前記カラーフィルタ基板の外表面が、ガラス板の表面からなり、
    　前記外側遮光膜が、酸化炎処理及びケイ酸化炎処理によって枠状に表面処理された部分の前記ガラス板の表面上に形成される請求項１に記載の液晶表示装置。     The outer surface of the color filter substrate consists of the surface of a glass plate,
    The liquid crystal display device according to claim 1, wherein the outer light-shielding film is formed on a surface of the glass plate at a portion surface-treated in a frame shape by an oxidation flame treatment and a silicidation flame treatment.
  3. 　前記枠状に表面処理された部分と重ならないように、前記カラーフィルタ基板の外表面上に偏光板が積層される請求項２に記載の液晶表示装置。 3. A liquid crystal display device according to claim 2, wherein a polarizing plate is laminated on the outer surface of the color filter substrate so as not to overlap with the surface-treated portion in the frame shape.
  4. 　前記枠状の内側遮光膜が、前記カラーフィルタ基板の内表面上に形成されるブラックマトリックスの一部からなる請求項１～３の何れか１項に記載の液晶表示装置。 4. The liquid crystal display device according to claim 1, wherein the frame-shaped inner light-shielding film is formed of a part of a black matrix formed on an inner surface of the color filter substrate.
  5. 　液晶層を挟んで互いに向かい合うように前記液晶層を囲むシール部を介して貼り合わせられる薄膜トランジスタアレイ基板と、カラーフィルタ基板とを備え、前記カラーフィルタ基板が、前記シール部よりも中央側の内表面上に、枠状の内側遮光膜を有し、前記薄膜トランジスタアレイ基板の外表面側から光が入射されると、前記カラーフィルタ基板の外表面側に、前記内側遮光膜の内周縁の形状に応じて輪郭が定まる表示領域が現れる液晶表示パネルの前記カラーフィルタ基板の外表面上に、前記枠状の内側遮光膜と向かい合い、かつ前記内側遮光膜の外周縁よりも外側まで広がった枠状の外側遮光膜を形成する遮光膜形成方法であって、
    　前記カラーフィルタ基板の外表面を、酸化炎処理及びケイ酸化炎処理によって枠状に表面処理する工程と、
    　前記表面処理された部分を少なくとも覆うように前記外側遮光膜の元となる塗膜を形成する工程と、
    　前記表面処理された部分における前記塗膜の密着力と、前記表面処理されていない部分における前記表面処理された部分からはみ出した前記塗膜の密着力との差を利用して、前記はみ出した前記塗膜を除去して、前記カラーフィルタ基板の外表面上に前記外側遮光膜を形成する工程と、を備える遮光膜形成方法。     A thin film transistor array substrate bonded via a seal portion surrounding the liquid crystal layer so as to face each other across the liquid crystal layer, and a color filter substrate, the color filter substrate being an inner surface on the center side of the seal portion A frame-shaped inner light-shielding film on the top, and when light is incident from the outer surface side of the thin film transistor array substrate, according to the shape of the inner peripheral edge of the inner light-shielding film on the outer surface side of the color filter substrate A frame-shaped outer surface that faces the frame-shaped inner light-shielding film and extends to the outside of the outer peripheral edge of the inner light-shielding film on the outer surface of the color filter substrate of the liquid crystal display panel in which a display area with a contour is defined A light shielding film forming method for forming a light shielding film,
    A step of surface-treating the outer surface of the color filter substrate into a frame shape by oxidation flame treatment and silicidation flame treatment;
    Forming a coating film that is the basis of the outer light-shielding film so as to cover at least the surface-treated portion;
    Using the difference between the adhesion force of the coating film in the surface-treated portion and the adhesion force of the coating film protruding from the surface-treated portion in the non-surface-treated portion, the protrusion Removing the coating film, and forming the outer light-shielding film on the outer surface of the color filter substrate.
PCT/JP2010/071805 2010-03-26 2010-12-06 Liquid crystal display device and method of forming light-shielding film WO2011118091A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-072271 2010-03-26
JP2010072271 2010-03-26

Publications (1)

Publication Number Publication Date
WO2011118091A1 true WO2011118091A1 (en) 2011-09-29

Family

ID=44672674

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2010/071805 WO2011118091A1 (en) 2010-03-26 2010-12-06 Liquid crystal display device and method of forming light-shielding film

Country Status (1)

Country Link
WO (1) WO2011118091A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108107624A (en) * 2017-12-26 2018-06-01 江西合力泰科技有限公司 A kind of display module and assemble method for preventing light leak
CN113311612A (en) * 2021-04-30 2021-08-27 惠科股份有限公司 Display panel and display device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2531930Y2 (en) * 1989-09-14 1997-04-09 カシオ計算機株式会社 Liquid crystal display
JPH11295683A (en) * 1997-09-11 1999-10-29 Seiko Epson Corp Electro-optical device, production thereof and projection display device
JPH11295712A (en) * 1998-04-09 1999-10-29 Hitachi Ltd Liquid crystal display device
JP2002053982A (en) * 2000-04-20 2002-02-19 Isimat Gmbh Siebdruckmaschinen Modifying method and printing method for surface of solid substrate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2531930Y2 (en) * 1989-09-14 1997-04-09 カシオ計算機株式会社 Liquid crystal display
JPH11295683A (en) * 1997-09-11 1999-10-29 Seiko Epson Corp Electro-optical device, production thereof and projection display device
JPH11295712A (en) * 1998-04-09 1999-10-29 Hitachi Ltd Liquid crystal display device
JP2002053982A (en) * 2000-04-20 2002-02-19 Isimat Gmbh Siebdruckmaschinen Modifying method and printing method for surface of solid substrate

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108107624A (en) * 2017-12-26 2018-06-01 江西合力泰科技有限公司 A kind of display module and assemble method for preventing light leak
CN113311612A (en) * 2021-04-30 2021-08-27 惠科股份有限公司 Display panel and display device

Similar Documents

Publication Publication Date Title
TWI470321B (en) Liquid crystal display device
JP5710302B2 (en) Liquid crystal display
JP4801671B2 (en) Display device
WO2011062009A1 (en) Liquid crystal panel and liquid crystal display device
JP2008107488A (en) Display device and its manufacturing method
JP2014235185A (en) Display device
JP2008203875A (en) Liquid crystal panel, manufacturing method thereof and liquid crystal display device
JP2019082523A (en) Liquid crystal display device
JP2008139555A (en) Liquid crystal display device and its manufacturing method
WO2011118091A1 (en) Liquid crystal display device and method of forming light-shielding film
JP4594943B2 (en) Liquid crystal display panel combination method
JP4912643B2 (en) Method for manufacturing panel for light modulation device
US10962824B2 (en) Color filter substrate, method of producing the same, and display panel
JP2017181821A (en) On-vehicle device including curved display
JPH08328023A (en) Production of liquid crystal display device
CN106501991A (en) Black matrix&#34;, the curing of display panels frame adhesive and display panels
CN209911726U (en) Display panel and display device
JP2004245916A (en) Liquid crystal panel and method for manufacturing the same, and liquid crystal display device
KR200242865Y1 (en) Liquid crystal display having black silk layer for light shielding means
KR101087328B1 (en) Liquid crystal display device and polarizing plate structure
KR20160121393A (en) Display panel
JP2001281677A (en) Liquid crystal display device
JPH112822A (en) Liquid crystal display device and its manufacture
JP2007264102A (en) Liquid crystal display panel and method of manufacturing same
JP2005115056A (en) Liquid crystal display and manufacturing method of liquid crystal display

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10848483

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10848483

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP