JP3203882B2 - Color filter for liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a black matrix pattern on a glass substrate.
d. It relates to a filter color pattern composed of each colored pattern and a color filter for a liquid crystal display device provided with a transparent conductive film or the like as appropriate.

[0002]

2. Description of the Related Art As shown in a side sectional view of FIG. 3, a conventional color filter of a liquid crystal display device or the like has an appropriate shape such as a regular parallel line or a grid on a glass substrate 11 for a color filter. A black matrix pattern 12 having a light-shielding (or light-absorbing) pattern is provided, and Blue, Green, Red is interposed between the black matrix patterns 12.
Filter color pattern 13 composed of each coloring pattern
A transparent protective layer 14 (transparent overcoat layer) is provided on the upper side of the black matrix pattern 12 and the filter color pattern 13 using an appropriate transparent resin such as an epoxy-based resin. Has a transparent conductive layer 15 such as an ITO thin film laminated in a wiring pattern.

In the above-mentioned color filter, the black matrix pattern 12 and the filter color pattern 13 need to be arranged so as to be in close contact with each other so that no air gap is formed between the black matrix pattern 12 and the filter color pattern 13. Therefore, the filter color pattern 13 is provided so as to overlap the black matrix pattern 12.

[0004] The black matrix pattern 12 is
When a pattern is formed on the glass substrate 11, a chromium-deposited thin film formed on the glass substrate 11 by a metal deposition method is patterned by a pattern etching method,
A pattern is formed by a photofabrication (photolithographic method) method using a pigment-dispersed photoresist in which a black or dark color pigment is dispersed in a photoresist, or a pattern is formed by an intaglio offset printing method using a printing ink.

In the conventional color filter for a liquid crystal display device shown in FIG. 3, a transparent glass substrate 18 for a counter electrode is disposed so as to be parallel and spaced apart from the transparent conductive layer 15 formed on the glass substrate 11. A transparent conductive layer 19 such as an ITO thin film is formed on the inner surface of the transparent glass substrate 18 in a wiring pattern.

The transparent glass substrate 1 and the transparent glass substrate 18 for the counter electrode are filled with a liquid crystal 17 in the space between the transparent glass substrate 1 and the epoxy resin adhesive or the like in which glass powder or the like also serving as a spacer is mixed as a compound. The peripheral end portions are joined in a hermetically sealed state by an adhesive sealing material 6 (joining sealing material). As shown in FIG. A transparent protective layer 14 made of an epoxy resin or the like having good adhesion to the transparent conductive layer 15, a transparent conductive layer 15 made of an ITO thin film having good adhesion to the transparent protective layer 14, and the transparent conductive layer 15 and a glass substrate. 18 is bonded and sealed by the adhesive sealing material 16 made of an epoxy resin adhesive having a good adhesive property, and its adhesive strength is well maintained.

[0007]

In recent years, techniques have been developed to simplify the process of manufacturing a color filter for a liquid crystal display device so that it can be manufactured efficiently and at a relatively low price. In the above color filter for a liquid crystal display device, the transparent protective layer 14 (transparent overcoat layer) for protecting the filter color pattern 13 is omitted.

[0008] However, when the transparent protective layer 14 is omitted in FIG. 3, the glass substrate 11 and the transparent conductive layer are connected to each other at the joint of the liquid crystal sealing seal ends of the filter glass substrate 11 and the counter electrode glass substrate 18. Layer 15 (ITO
A thin film) is formed by direct contact
Blue, Green is attached to the bonding surface of the glass substrate 11.
Fine processing residues that are occasionally generated in a step before bonding such as a forming processing step of each of the n and Red filter color patterns 13 are attached, and the bonding strength between the glass substrate 11 and the transparent conductive layer 15, and thus the glass substrate 11, This lowers the bonding strength (filter panel assembly strength) and the liquid crystal sealing strength of each other.

According to the present invention, the bonding strength between a glass substrate for a color filter and a glass substrate for a counter electrode and the sealing of a liquid crystal seal are eliminated by omitting a transparent protective layer (transparent overcoat layer) for protecting a filter color pattern. An object of the present invention is to eliminate the reduction in strength and realize the omission of the transparent protective layer, thereby making it possible to manufacture a color filter for a liquid crystal display device efficiently and relatively inexpensively.

[0010]

According to the present invention, a black matrix pattern 2 having an insulating property or a current blocking property and a filter color pattern 5 composed of blue, green, and red coloring patterns are provided on a transparent glass substrate 1. A color filter for a liquid crystal display device having a transparent conductive layer on the black matrix pattern 2 and the filter color pattern 5; and a transparent conductive layer 4 provided directly on the black matrix pattern 2 and the filter color pattern 5. A color filter for a liquid crystal display device, wherein a bonding anchor layer 3 of a chromium film or a chromium oxide film is provided along a liquid crystal sealing portion of a transparent glass substrate 1.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A color filter for a liquid crystal display device of the present invention
This will be described in detail below according to one embodiment of FIGS.

As shown in the side sectional view of FIG. 1, a color filter for a liquid crystal display device according to the present invention is formed on a transparent glass substrate 1 for a color filter by forming an appropriately shaped pattern such as a regular parallel line or a grid. A light-shielding (or light-absorbing) black matrix pattern 2 is provided, and a metal thin film such as chromium or chromium oxide formed by a vapor deposition method, a sputtering method, or the like is formed around the black matrix pattern 2 outside the formation region. A bonding anchor layer 3 having a width (width of a bonding seal portion for a liquid crystal sealing seal described later) is provided.

A filter color pattern 5 composed of blue, green, and red coloring patterns is provided between the black matrix patterns 2. A black color is directly provided above the black matrix pattern 2 and the filter color pattern 5. A transparent conductive layer 4 such as an ITO thin film is laminated in a wiring pattern so as to contact the matrix pattern 2 and the filter color pattern 5.

In the above color filter, the black matrix pattern 2 and the filter color pattern 5 need to be arranged so as to be in close contact with each other so that no void is formed in the adjacent portion between the black matrix pattern 2 and the filter color pattern 5. Therefore, the filter color pattern 5 is provided so as to overlap the black matrix pattern 2.

When the black matrix pattern 2 is formed on the glass substrate 1, the glass substrate 1
A light-shielding (translucent to opaque) chromium-deposited thin film or a light-shielding chromium oxide-deposited thin film formed by a metal deposition method, a sputtering method, or the like,
This is for forming a pattern of a composite metal thin film (laminated film) such as chromium oxide by a pattern etching method, and the black matrix pattern 2 itself is a conductive material that can conduct electricity.

In the present invention, the black matrix pattern 2 having a current-blocking property means a pattern on the insulating glass substrate 1 in a state where the current is cut off with respect to the others.

In the present invention, the insulating black matrix pattern 2 is made of a material that is not electrically good, such as metal oxide, in addition to a simple metal material such as chromium, which is an electrically good material. It means the formed black matrix pattern.

As shown in FIG. 1, the color filter for a liquid crystal display device of the present invention comprises an ITO thin film formed on a black matrix pattern 2 and a filter color pattern 5 formed on a transparent glass substrate 1 for a color filter. A transparent conductive layer 4 (solid in the case of the TFT array liquid crystal display system) is formed by the above method.

As shown in FIG. 1, a color filter for a liquid crystal display device according to the present invention is used for a counter electrode so as to be parallel to and separate from the transparent conductive layer 4 formed on a transparent glass substrate 1. And a transparent conductive layer 9 for a counter electrode, such as an ITO thin film, is formed in a TFT array on the opposing inner surface of the transparent glass substrate 8.

The conductive wiring pattern of the transparent conductive layer 4 on the color filter glass substrate 1 side and the conductive wiring pattern of the transparent conductive layer 9 on the counter electrode glass substrate 8 side are appropriately set according to the display format of the liquid crystal display device. (Design change) is possible, for example, in the case of the XY drive display method, the wiring pattern is a striped wiring pattern spaced apart in a direction perpendicular to each other, and each filter color pattern is provided immediately below the mutually orthogonal point portion. In the case of a TFT display system, the transparent conductive layer 4 formed on the color filter glass substrate 1 is solid, and the transparent conductive layer 9 on the counter electrode glass substrate 8 is a TFT array. It is a shape pattern. In the present invention, when the seal portion is made of a conductive film such as a chromium film, the XY drive display method may cause a short circuit between lines and display may not be possible. It is.

As shown in FIG. 1, a transparent glass substrate 1 for the color filter and a transparent glass substrate 8 for the counter electrode are provided.
The liquid crystal 7 is filled in the space facing the space, and the outside of the area where the black matrix pattern 2 and the filter color pattern 5 are formed is mutually separated by an adhesive sealing material 6 (joining sealing material) such as an epoxy resin adhesive. Glass substrate 1,
The liquid crystal is hermetically sealed along the bonding seal portion 8.

The ends of the liquid crystal sealing seals of the glass substrates 1 and 8 are bonded to one of the color filter glass substrates 1 by a thin metal film such as chromium or chromium oxide formed by a vacuum deposition method or the like. Anchor layer 3
Transparent conductive layer 4 made of ITO thin film with good adhesion to
And the transparent conductive layer 4 and the glass substrate 8 for the opposing electrode are bonded and sealed by an adhesive sealing material 6 (bonding sealing material) such as an epoxy resin adhesive having good adhesiveness. The interlayer adhesion strength of is maintained well.

The color filter according to the present invention, as shown in FIG.
A filter color pattern 5 composed of each of a ue, green, and red color pattern is provided, and a transparent conductive film or the like (for example, a wiring pattern in which tin is doped with indium or the like) is provided above the black matrix pattern 2 and the filter color pattern 5. A transparent conductive film 4 such as a solid ITO film is laminated.

In the color filter according to the present invention, as in the prior art, the black matrix pattern 2 and the filter color pattern 5 are in close contact with each other so that no air gap is formed between the black matrix pattern 2 and the filter color pattern 5. The edges of the black matrix pattern 2 and the filter color pattern 5 are adjacent to each other, or the filter color pattern 5 is overlapped on the black matrix pattern 2 so that the edges overlap. Is provided.

In the color filter for a liquid crystal display device of the present invention, the bonding anchor layer 3 is formed in a suitable bonding shape such as a rectangular shape or a circular shape, and in an appropriate width around the outer edge of the arrangement region of the black matrix pattern 2. The adjacent arrangement of the bonding anchor layer 3 is, for example, as shown in the side sectional view of FIG. 1 and the plan view of FIG. Can be continuously arranged without providing an interval between the part and the seal joint part by the adhesive sealing material 6. In addition, m indicates each line width (image line width) of the black matrix pattern 2, s indicates the bonding width of the seal bonding portion by the adhesive sealing material 6, and w
₁ and below the transverse seal joint length, w ₂ are the left and right sides of the longitudinal sealing joint indicates the length, a is the black matrix pattern 2 and connecting anchor in the black matrix pattern area outer ends The line width including the layer 3 is shown.

In the color filter for a liquid crystal display device of the present invention, the adjacent arrangement of the joint anchor layer 3 is such that the outer end of the black matrix pattern 2 and the end of the joint anchor layer 3 are not necessarily continuous as patterns. The distance between the outer end of the black matrix pattern 2 and the end of the joint anchor layer 3 is, for example, 0.1 mm.
It is also possible to provide a small interval of about 1 mm and to be adjacently arranged at a distance.

In the production of the color filter for a liquid crystal display device of the present invention, first, a color filter glass substrate 1 is
Depending on the vacuum deposition method, the sputtering method, etc., for example, the film thickness is 300 to 2000 ° or more (preferably 600 °).
A light-shielding (semi-transparent to opaque) chromium layer or chromium oxide layer having an optical density of 1.5 or more (preferably 2.0 or more) or a composite thin film of these is formed.

Subsequently, a positive photosensitive photoresist (for example, a novolak type phenol resin, an alkali-soluble polymer such as a methyl methacrylate-maleic anhydride copolymer) and an alkali-soluble polymer by light irradiation are formed on the metal thin film. A positive photoresist containing an alkali dissolution inhibitor such as quinonediazide to be increased is applied over the entire surface and dried to provide a photosensitive resin layer serving as an etching resist.

Specifically, for example, a positive photoresist containing a novolak type phenol resin and an alkali dissolution inhibitor such as quinonediazide is applied over the entire surface and dried,
A photosensitive resin layer (for example, a coating thickness; 0.5 μm to 1 μm) serving as an etching resist is provided.

Next, the photosensitive resin layer is irradiated with ultraviolet rays by a photofabrication (photolithographic method) to form a black matrix pattern 2 having an appropriate shape as shown in FIG. Then, the exposed portion of the photosensitive resin layer is made alkali-soluble (photodecomposed) by pattern exposure (exposure using an original such as a photomask or electron beam exposure), and a black matrix pattern 2 is formed on an unexposed portion. Then, an alkali-insoluble region in the shape of the bonding anchor layer 3 is formed.

Subsequently, the photosensitive resin layer in the exposed portion (photodecomposition region) is washed with an alkaline solution (sodium hydroxide, eg, pH
(Value = about 10) to form a resist pattern (resist pattern for etching) having a shape equivalent to the black matrix pattern 2 and a shape equivalent to the bonding anchor layer 3.

Thereafter, using the resist pattern as an etching mask, the lower metal thin film (chromium film, chromium oxide film) is appropriately etched with an etching solution (cerium nitrate etching solution or the like).

Thereafter, the resist pattern is stripped with a stripping solution that is more alkaline than the alkaline solution used for the development (eg, an alkaline solution having a pH of 11 or more) or an organic solvent (eg, acetone or methyl ethyl ketone) as appropriate. By doing so, a black matrix pattern 2 of a light-shielding metal thin film and a bonding anchor layer 3 are formed on the glass substrate 1 of FIG. 1 in a pattern shape as shown in the plan view of FIG.

As shown in FIG. 1, a color filter for a liquid crystal display device according to the present invention is provided on a glass substrate 1 after a black matrix pattern 2 is formed.
A filter color pattern 5 composed of blue, green, and red coloring patterns is formed, and the transparent conductive film 4 is applied directly from above.

Blue, Gr, and the like are provided on the glass substrate 1 except for the region where the black matrix pattern 2 is formed.
In the case of forming the filter color pattern 5 composed of each of the colored patterns of “en” and “Red”, for example, a transparent photosensitive solution having good dyeing properties such as gelatin and a blue and green color are used.
A relief dyeing method similar to the method of forming a filter color pattern of a conventionally known color filter using each of the n and Red dyes is used for the adhesion of the residue component generated in the filter color pattern forming process to the ITO thin film. Appropriate because the decrease is small.

In addition, as a method of forming the filter color pattern 5, besides the method of the above-mentioned dyeing method, other than the method of Blue,
e, Green, Red, and the like.
1. An organic filter color pattern forming method by a printing method such as an intaglio offset printing method using colored printing inks of reen and Red, or titanium oxide (TiO ₂ , light refractive index;
40) or a dielectric film such as silicon oxide (SiO ₂ , light refractive index: 1.46) is deposited and laminated in multiple layers, and the interference color filters (polarizing filters) of Blue, Green, and Red are selected according to the thickness and combination of the layers. It is possible to form the black matrix pattern 2 and the filter color pattern 5 with their edges closely adjacent to each other, or the filter color pattern 5 The filter color pattern 5 is formed on the black matrix pattern 2 so that its edges overlap.

[0037]

The color filter for a liquid crystal display device of the present invention includes a transparent conductive layer 4 so as to be in direct contact with the black matrix pattern 2 and the filter color pattern 5 on the transparent glass substrate 1. Since the bonding anchor layer 3 made of a metal thin film is provided along the portion, the bonding end portions of the liquid crystal sealing seals of the glass substrates 1 and 8 are attached to one of the color filter glass substrates 1 by a vacuum deposition method or the like. The transparent conductive layer 4 made of an ITO thin film having good adhesion to the bonding anchor layer 3 made of a metal thin film such as chromium or chromium oxide formed by the method described above, and the transparent conductive layer 4 and the glass substrate 8 for the counter electrode. In order to maintain the facing and separating distance by an epoxy resin adhesive or the like having good adhesive properties, an adhesive seal material 6 (bonding seal material) such as an epoxy resin adhesive is used. Are joined sealed by interlayer adhesion strength between the glass substrate 1 and 8 has the effect to be better retained.

[0038]

The color filter for a liquid crystal display device according to the present invention comprises a color filter glass substrate 1 and a counter electrode electrode glass substrate, and a color filter glass substrate and a transparent conductive layer formed at the joint of the liquid crystal sealing seal ends. It does not adopt the direct bonding form with the glass substrate, but is bonded while maintaining good strength via the bonding anchor layer, so that the glass substrates in the case where the transparent protective layer for protecting the color filter color pattern is omitted are omitted. This can prevent the reduction of the bonding seal strength and the sealing strength of the liquid crystal encapsulation, and the omission of the transparent protective layer makes it possible to manufacture a color filter for a liquid crystal display device efficiently and at a relatively low price. is there.

[Brief description of the drawings]

FIG. 1 is a side sectional view of one embodiment of a color filter for a liquid crystal display device of the present invention.

FIG. 2 is a plan view of a black matrix pattern and a bonding anchor layer formed on a glass substrate for a color filter used in an embodiment of the color filter for a liquid crystal display device of the present invention.

FIG. 3 is a side sectional view of a conventional color filter for a liquid crystal display device.

FIG. 4 is a plan view of a black matrix pattern formed on a color filter glass substrate used for a conventional color filter for a liquid crystal display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Glass substrate for color filter 2 ... Black matrix pattern 3 ... Anchor layer for joining 4 ... Transparent conductive film 5 ... Filter color pattern 6 ... Adhesive sealing material 7 ... Liquid crystal 8 ... Glass substrate for counter electrode 9 ... Transparent for counter electrode Conductive layer a: Pattern line width including the anchor layer for bonding and the black matrix pattern s: Bonding seal width m: Black matrix pattern width 11: Glass substrate for color filter 12: Black matrix pattern 13: Filter color pattern 14: Transparent protection Layer 15 ...
Transparent conductive layer 16 Adhesive sealing material 17 Liquid crystal 18 Glass substrate for counter electrode 19 Transparent conductive layer for counter electrode

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-273743 (JP, A) JP-A-4-324423 (JP, A) JP-A-4-310902 (JP, A) JP-A-5-305 11107 (JP, A) JP-A-6-230365 (JP, A) JP-A-4-307518 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 5/20 101 G02F 1/1335 505 G02F 1/1343

Claims (1)

(57) [Claims] An insulating or current blocking black matrix pattern on a transparent glass substrate;
And a filter color pattern 5 including green and red color patterns. The color filter for a liquid crystal display device having a transparent conductive layer on the black matrix pattern 2 and the filter color pattern 5 includes a black matrix pattern 2 and a filter. A liquid crystal display comprising a transparent conductive layer (4) so as to be in direct contact with a color pattern (5), and a bonding anchor layer (3) made of a chromium film or a chromium oxide film along a liquid crystal sealing portion of a transparent glass substrate (1). Color filter for device.