JP2004069989A - Needle for correcting defect of color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle for correcting a defect of a color filter by which a coating diameter can be minimized and an increase in frequency of coating can be prevented. <P>SOLUTION: A composition for a color filter film is stuck to a tip of the needle for correcting the defect of the color filter, brought into contact with a defect removing part of the color filter, applied thereon and cured to correct the defect of the color filter. An angle formed by a tip flat surface and a tip side wall of the needle for correcting the defect of the color filter is specified to be in the range of 80 to 100°. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a color filter defect correction needle used for correcting a color filter defect.
[0002]
[Prior art]
In recent years, with the development of personal computers, especially portable personal computers, the demand for liquid crystal display devices, especially color liquid crystal display devices, tends to increase. The color liquid crystal display device is provided with a color filter having a coloring pattern of three primary colors of red (R), green (G), and blue (B), and R, G, and The liquid crystal operates as a shutter by turning on and off the electrode corresponding to each pixel of B, and light passes through each pixel of R, G, and B to perform color display.
[0003]
In such a color filter, a color filter film in which a pixel portion composed of R, G, and B is formed in a predetermined pattern on a transparent substrate is formed, and a liquid crystal is driven on the color filter film. A transparent electrode is formed.
[0004]
However, for example, when foreign matter such as dust of several μm to several tens of μm is mixed in the color filter film, and the foreign matter is conductive or has a high dielectric constant, Problems such as short-circuiting of the driving electrodes and deterioration of the display quality of the liquid crystal may occur. Therefore, it is desirable to prevent such foreign matter from being mixed during the manufacturing process. However, as a practical problem, even when the color filter is manufactured in an environment with a small amount of foreign material, such as a clean room, it is necessary to manufacture a color filter that is completely free of foreign matter and inclusion. Is impossible.
[0005]
In recent years, multiple color filters have been obtained. Therefore, if the color filter mixed with the foreign matter is disposed of, the problem in terms of cost is increased.
[0006]
From this point of view, as a correction method performed after removing the foreign matter attached to or included in the color filter, ink is attached to the tip of the needle, and the ink is brought into contact with the defect removing portion of the color filter, applied and cured. A method of correcting the above is described in JP-A-9-61296.
[0007]
In such a method, a needle having a tapered tip portion is generally used.Since the tapered needle has a large surface area at the tip portion, the ink is pulled up together with the needle when the needle is separated from the color filter. There is a problem that the amount of ink applied to the defect removal portion is small. That is, since the amount of ink applied in one process is small, it is necessary to perform the same process many times in order to obtain a desired film thickness, which is a factor requiring much labor and time. In addition, when the needle is pushed into the defect removal portion of the color filter, the ink spreads along the tip side wall of the needle in a wide range, so that the diameter of the applied coating is widened and the accuracy of correction is reduced.
[0008]
Therefore, in order to minimize the coating diameter, a method of minimizing the tip diameter of the needle can be considered. However, since this enables the coating diameter to be minimized, the film thickness decreases, so that a desired film thickness is reduced. In order to obtain a thickness, it is necessary to increase the number of coatings, and furthermore, it is difficult to perform the correction with high accuracy, for example, a desired film thickness may not be obtained even if the number of coatings is increased as described above.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and has as its main object to provide a color filter defect correction needle capable of minimizing the application diameter and preventing an increase in the number of application times. It is the purpose.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, as described in claim 1, a color filter film composition is adhered to the tip, and the composition is brought into contact with a defect removing portion of the color filter and applied and cured. In the color filter defect correction needle that corrects the color filter defect, the angle formed between the tip flat surface of the color filter defect correction needle and the tip side wall is in the range of 80 ° to 100 °. And a needle for correcting a defect of a color filter.
[0011]
In the present invention, by setting the angle formed between the distal end flat surface and the distal end side wall of the defect correcting needle of the color filter within the above range, the surface area at the distal end portion of the needle can be made smaller than before, so that the needle is When separated from the color filter, the amount of the composition for a color filter film that is pulled up together with the needle without being applied to the defect removing portion can be reduced. Therefore, the amount of the composition for a color filter film applied in one process increases, and the labor required for correction can be reduced. Further, when the needle is pushed into the defect removal portion, the range in which the color filter film composition spreads along the tip side wall of the needle is narrowed, so that the coating diameter can be minimized.
[0012]
In the first aspect of the invention, as described in the second aspect, it is preferable that the angle of the defect correcting needle of the color filter is in a range of 90 ° to 95 °. If the angle is smaller than the above range, the tip of the needle becomes reversely tapered, but it is difficult to process the tip of the needle into such a shape, and there is a problem in processing. On the other hand, if the angle is larger than the above range, the surface area of the tip portion of the needle becomes large, and there is a possibility that the film thickness obtained by one processing may be reduced. This is because the range in which the composition for a color filter film spreads along the front end side wall is widened, and minimization of the application diameter is prevented.
[0013]
In the present invention, as described in claim 3, a defect detecting step of detecting a defect present in the color filter, and irradiating a laser beam to a region where the defect detected by the defect detecting step is present, A defect removing step of removing defects together with the color filter film, and a color filter manufacturing method having a repairing step of applying and curing a composition for a color filter film to correct white spot defects caused by the defect removing step, In the correcting step, the color filter film composition is attached to the tip of the needle for correcting a defect of the color filter according to claim 1 or 2, and is applied by contacting the defect removing portion of the color filter. And a method of manufacturing a color filter, which is a step of correcting defects by curing.
[0014]
In the present invention, by using the above-described color filter defect correction needle for the color filter manufacturing method, the labor required for the correction process is reduced, and the manufacturing efficiency can be improved.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
The defect correcting needle of the color filter of the present invention and a method of manufacturing a color filter using the needle will be described.
[0016]
A. First, a needle for correcting a defect of a color filter will be described.
[0017]
The needle for correcting a color filter defect of the present invention corrects a color filter defect by adhering a color filter film composition to the tip, applying the composition in contact with a defect removing portion of the color filter, and curing. In the needle for correcting a defect of a color filter, an angle formed between a plane of the tip of the needle for correcting a defect of the color filter and a side wall of the tip is within a range of 80 ° to 100 °.
[0018]
Such a needle for correcting a defect of the color filter of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 shows an example of a cross-sectional view of a needle for defect correction of a color filter of the present invention. The tip 3 of the defect correction needle 3 of the color filter of the present invention is formed by the tip flat surface 1 and the tip side wall 2, and the angle a formed by the tip flat surface 1 and the tip side wall 2 is formed by them. The angle is an angle formed on the member side of the defect correction needle 3 of the color filter as shown in FIG.
[0020]
Here, the tip plane of the defect correcting needle means the plane of the tip part of the needle, and the tip side wall means the side wall part of the tip part of the needle.
[0021]
FIG. 2 shows an example of a cross-sectional view of a conventional needle for correcting a defect of a color filter. As shown in FIG. 2, in the conventional color filter defect correction needle 6, the distal end portion is formed by the distal end flat surface 4 and the distal end side wall 5. It is larger than the angle formed by the distal end flat surface and the distal end side wall of the defect correcting needle of the filter, that is, the angle a shown in FIG.
[0022]
In such a conventional defect correcting needle, when the needle is pushed into the defect removing portion of the color filter and the color filter film composition adhering to the tip portion of the needle is applied to the defect removing portion, the tip flat surface is used. Because the angle formed between the color filter film and the tip side wall is large, the color filter film composition spreads widely along the tip side wall, and the surface area of the tip portion is large, so that the color filter film composition Lots of things. Therefore, when the needle is pulled up from the defect removing portion, the amount of the color filter film composition that is pulled up together with the needle without being applied to the defect removing portion and attached to the tip side wall etc. of the needle increases. No proper coating amount was obtained.
[0023]
Therefore, in the present invention, by setting the angle formed by the distal end flat surface and the distal end side wall of the defect correcting needle of the color filter within the above range, when the needle is pushed into the defect removing portion, along the distal end side wall of the needle. Since the range in which the composition for a color filter film spreads can be reduced, and the surface area at the tip of the needle can be made smaller than before, the amount of the composition for a color filter film adhered to the tip side wall is reduced. be able to. Therefore, when the needle is separated from the color filter, the amount of the color filter film composition that is lifted together with the needle without being applied to the defect removing portion is reduced, so that the coating amount of the color filter film composition obtained in one process is reduced. This increases the amount of work required for correction. Further, since the range in which the composition for a color filter film spreads along the tip side wall of the needle is narrow, it is possible to minimize the application diameter.
[0024]
In the present invention having such advantages, the angle formed between the tip flat surface and the tip side wall of the defect correcting needle of the color filter is set in the range of 80 ° to 100 °, and among them, the range of 90 ° to 95 °. It is preferable to be within.
[0025]
If the angle is larger than the above range, the surface area of the tip portion of the needle becomes large, and the amount of the composition for a color filter film that can be applied in a single treatment decreases, which is not preferable. Further, when the needle is pushed into the defect-removed portion of the color filter, the range in which the composition for a color filter film spreads along the tip side wall of the needle is widened, which may hinder miniaturization. On the other hand, if the angle is smaller than the above range, the tip portion of the needle becomes reversely tapered, but it is difficult to process it into such a shape.
[0026]
Further, it is particularly preferable that the angle is 90 °. The angle of 90 ° can minimize the surface area, and when the needle is pushed into the defect removal portion of the color filter, the range in which the composition for the color filter film spreads along the tip side wall of the needle is narrow. This is because the application diameter can be easily minimized.
[0027]
In addition, the diameter of the tip flat of the needle for correcting a defect of the color filter of the present invention is such a diameter that when the tip of the needle is pushed into the defect removal portion of the color filter, the pushing can be easily performed. There is no particular limitation. Specifically, it is preferably in the range of 5 μm to 100 μm, and more preferably in the range of 10 μm to 70 μm. The amount of the composition for a color filter film to be applied varies depending on the diameter of the tip end plane of the needle. However, a defect-correcting needle having a diameter within the above range can provide a suitable application amount. Because.
[0028]
Furthermore, the material used for the defect correction needle of the color filter of the present invention is not particularly limited as long as it is a material that is easy to process and has rigidity. Specific examples include metals such as iron and aluminum.
(Color filter defect repair device)
Next, an apparatus for correcting a defect of a color filter using the needle for correcting a defect of the color filter described above will be described.
[0029]
The color filter defect correcting device according to the present invention uses the above-described color filter defect correcting needle, attaches the color filter film composition to the tip of the defect correcting needle, and removes the color filter film composition from the color filter defect removing portion. A color filter defect correction device for correcting a color filter defect by contacting the color filter with a plurality of color filter defect correction needles having different diameters at the tip end flats. is there.
[0030]
In the above-described needle for correcting a defect of the color filter, by changing the diameter of the tip plane, it is possible to change the amount of the composition for the color filter film applied to the defect removal portion of the color filter, It is also possible to change the application diameter. In the present invention, an apparatus for correcting a defect of a color filter in which a plurality of needles for correcting defects having different diameters in the plane of the tip of the needle are mounted, so that an optimum coating diameter can be adjusted according to a state of a defect removal portion of the color filter. In addition, it is possible to select a defect correction needle that realizes the amount of application, so that a highly accurate correction can be performed efficiently. Further, when the defect removal portion is corrected by repeating the application a plurality of times, it is possible to use not only one but also a plurality of defect correction needles having different diameters at the tip flat surface in combination. Thereby, the efficiency of correction is improved, which is advantageous in manufacturing efficiency.
[0031]
Further, in such a color filter defect correction device, a defect correction needle having a different angle between the tip plane and the tip side wall of the needle and a defect correction needle having a different tip plane diameter are combined to form a color filter. It may be a case where a plurality of film composition applying means are mounted. By mounting a plurality of defect correction needles having both different angles and diameters in this manner, it is possible to more precisely adjust the film thickness, and to perform more accurate correction. . Further, the range of selection of usable color filter film compositions can be further expanded.
[0032]
B. Next, a method for manufacturing a color filter will be described.
[0033]
The method for manufacturing a color filter according to the present invention includes a defect detection step of detecting a defect present in the color filter, and irradiating a laser beam to a region where the defect detected in the defect detection step is present, to remove the defect from the color filter film. A defect removal step of removing together, and a defect of white spots caused by the defect removal step, a correction step of applying and curing a composition for a color filter film, and a correction step of correcting the defect, wherein the correction step, Using the above-described color filter defect correction needle, a color filter film composition is adhered to the needle tip of the defect correction needle, and the color filter film is brought into contact with the defect removal portion of the color filter, and is applied and cured to cure the defect. Is a step of correcting
[0034]
According to the color filter manufacturing method of the present invention, the use of the above-described color filter defect correction needle reduces the time and effort required for the repair process, thereby improving the color filter manufacturing efficiency.
[0035]
A method for manufacturing such a color filter of the present invention will be described with reference to FIG. First, during the color filter manufacturing process, as shown in FIG. 3A, a defect detection for detecting a defect such as a foreign substance 13 inside the color filter film 12 or on the surface thereof formed on the transparent substrate 11. Perform the process.
[0036]
Here, the color filter film means a pixel portion or a black matrix. FIG. 3 shows a case where a defect such as a foreign substance 13 exists in the pixel portion 12a even in the color filter film 12, but in the present invention, a defect such as the foreign substance 13 is present inside or on the surface of the black matrix 12b. This includes the case where it exists.
[0037]
Next, a defect removing step of irradiating the foreign matter 13 detected in the defect detecting step and the color filter film 12 existing in the vicinity thereof with laser light to remove the foreign matter 13 and the color filter film 12 in the vicinity thereof is performed. As shown in FIG. 3B, a color filter film removing part 14 is formed. Next, as shown in FIG. 3 (c), a color filter film composition is applied to the color filter film removing portion 14 using the above-described color filter defect correcting needle, and a repairing step of curing is performed.
[0038]
Hereinafter, each step will be described.
[0039]
a. Defect Detection Step First, the defect detection step in the present invention will be described. The defect detection step is a step of detecting a defect existing in the color filter. For example, as shown in FIG. 3A, the defect detection step is performed in the color filter film 12 formed on the transparent substrate 11 of the color filter or on the surface thereof. This is a step of detecting a defect such as an existing foreign matter 13.
[0040]
Here, the defect means a defect of the color filter film, specifically, a foreign substance present in or on the color filter film, or a color filter film itself that deteriorates display quality. And the like.
[0041]
Here, the defect detection step of the present invention is performed after the step of forming the color filter film on the transparent substrate and before the step of forming the protective layer or the like, among the steps of the color filter manufacturing method. Therefore, the color filter in the present invention refers to a color filter having a transparent substrate and a color filter film formed on the transparent substrate, for example, a pixel portion or a black matrix.
[0042]
The transparent substrate used in the present invention is not particularly limited as long as it is generally used as a transparent substrate. For example, a flexible substrate such as quartz glass, Pyrex (registered trademark), or a synthetic quartz plate may be used. Transparent rigid materials, or flexible transparent flexible materials such as transparent resin films and optical resin plates.
[0043]
Further, the pixel portion used in the present invention may be a case of a single color or a case of a plurality of colors such as three colors of red (R), green (G), and blue (B). It is formed in various patterns, for example, mosaic, triangle, stripe, etc. In the method of manufacturing the color filter of the present invention, as the method of forming the pixel portion, a conventional pigment dispersion method, a printing method using an inkjet method, or the like can be used, and the present invention is not particularly limited. Not something.
[0044]
Further, the black matrix used in the present invention is disposed between pixel portions and formed to block light. The method of producing the black matrix on the transparent substrate is not particularly limited, and for example, a metal thin film of chromium or the like having a thickness of about 1000 to 2000 ° is formed by, for example, a sputtering method or a vacuum evaporation method, and the thin film is formed. A method of forming by patterning and the like can be given.
[0045]
The black matrix may be a layer in which light-shielding particles such as carbon fine particles, metal oxides, inorganic pigments, and organic pigments are contained in a resin binder.The resin binder used may be a polyimide resin, An acrylic resin, an epoxy resin, polyacrylamide, polyvinyl alcohol, gelatin, casein, a mixture of two or more resins such as cellulose, a photosensitive resin, and a resin composition of an O / W emulsion type, for example, Emulsified reactive silicone can be used. As a method for patterning such a resinous black matrix, a generally used method such as a photolithography method and a printing method can be used.
[0046]
The color filter finally obtained by the method for manufacturing a color filter of the present invention includes a color filter film on the transparent substrate described above, for example, not only a pixel portion or a black matrix, but also a protective layer, a transparent electrode, or an alignment layer. Etc. are also included.
[0047]
Here, the defect detection method in the present invention is not particularly limited as long as it is a method capable of detecting the above-mentioned defect. For example, a halogen lamp light is irradiated, and the reflected light or the transmitted light is subjected to CCD. A method using an inspection device that receives light with a licensor and performs image processing of the received light to extract a defective portion can be used. In this step, if the presence of a defect is confirmed, the position of the defect in the color filter is measured.
[0048]
b. Defect Removal Step Next, the defect removal step in the present invention will be described. The defect removing step in the present invention is a step of irradiating a laser beam to a region where the defect detected in the defect detecting step exists, and removing the defect together with the color filter film. For example, as shown in FIG. 3A, defects such as the foreign matter 13 existing in or on the surface of the color filter film 12 detected in the defect detecting step and the color filter film 12 existing in the vicinity of the foreign matter 13 are detected. This is a step of irradiating a laser beam to form the color filter film removing section 14 from which the foreign matter and the color filter film 12 in the vicinity thereof have been removed as shown in FIG.
[0049]
The laser beam used in the defect removing step in the present invention is not particularly limited as long as the laser beam can remove the defect together with the color filter film. For example, a laser such as an excimer or a YAG can be used. As the YAG, not only the second harmonic, but also a YAG fundamental wave, a YAG third harmonic, a YAG fourth harmonic, or the like may be used.
[0050]
c. Correction Step Next, the correction step in the present invention will be described. The repairing step in the present invention refers to the removal of the color filter film near the defect together with the defect in the above-described defect removing step, so that, for example, as shown in FIG. The color filter film is whitened, and the color filter film composition is applied to the color filter film removing portion 14 using the above-described needle for correcting the color filter defect, and the color filter film is cured. This is a step of correcting the removing unit.
[0051]
The correction method in this step will be specifically described with reference to FIG.
[0052]
FIG. 4 shows an example of a repairing process using the above-described color filter defect repair needle. First, as shown in FIG. 4 (a), a color filter film composition 7 is adhered to the tip of the defect correction needle 3 of the color filter of the present invention, and the color filter film removing portion 14 is formed. Contact color filter. Thus, the color filter film composition 7 is applied to the color filter film removing section 14 (see FIG. 4B). Next, the defect correcting needle 3 is separated from the color filter, and the applied color filter film composition 7 is cured, so that the color filter film removing unit 14 is corrected (see FIG. 4C).
[0053]
In this step, since the defect correction needle of the color filter described above is used, when the defect correction needle is separated from the color filter, the color that is pulled up with the needle without being applied to the color filter film removing portion is removed. The amount of the composition for a filter membrane can be reduced. Therefore, since the amount of the composition for a color filter film that can be applied to the color filter film removal portion in one process increases, the number of times of application can be reduced. In addition, when the needle is pushed into the color filter film removal part, the range of the color filter film composition spreads along the tip side wall of the needle is narrow, so the application diameter can be minimized and accurate correction is possible. It is.
[0054]
Note that the defect correction needles of the color filter used here are the same as those described above, and thus description thereof will be omitted.
[0055]
Further, the composition for a color filter film used in the present invention may be, for example, a paint used for a normal pixel portion or a black matrix, or a dedicated paint or the like whose viscosity is adjusted to improve applicability. It may be used, or a special restoration agent may be used, but it is particularly preferable to use an ultraviolet curable paint. By using an ultraviolet-curable coating material, the coating material can be quickly cured by irradiating ultraviolet light after applying the coating material to the color filter film, and can be immediately sent to the next step. Therefore, a color filter can be efficiently manufactured. Further, the ultraviolet light used for curing the ultraviolet curable paint is also affected by the curing sensitivity of the ink, but usually, the integrated path light amount of ultraviolet light is preferably 0.1 J / cm ² to 50 / cm ^2. it is preferably Among them ^{0.5J / cm 2 ~2J / cm 2} .
[0056]
The ultraviolet irradiation device having the ultraviolet light source is not particularly limited as long as it is an ultraviolet irradiation device that can irradiate ultraviolet light capable of curing the composition for an ultraviolet-curable color filter film. For example, a spot UV irradiation device, a device using a shutter in a lamp house, and the like can be given.
[0057]
Note that the present invention is not limited to the above embodiment. The above embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and has the same effect. Within the technical scope of
[0058]
【Example】
Hereinafter, the present invention will be further described with reference to Examples.
[0059]
[Example]
A foreign substance included on the surface of a color filter in which an acrylic color filter film was formed on a glass substrate by photolithography using a halogen lamp as a light source, and the foreign substance was detected by reflected light. Next, a YAG laser (second harmonic) is used to irradiate a few pulses with a slit diameter of □ 30 μm to remove the resist part, and then to correct a defect in which the angle between the tip flat surface and the tip side wall is 90 °. The composition for a color filter film was applied using a needle until a desired film thickness was obtained.
[0060]
When the defect correcting needle was used, the coating was performed twice to obtain a film thickness of 2.0 μm and a coating diameter of 49 μm.
[0061]
[Comparative example]
The correction was performed in the same manner as in the above example, except that a defect correction needle in which the angle formed by the needle tip plane and the tip side wall was 105 ° was used. In this case, a film thickness of 2.0 μm and a coating diameter of 53 μm could be obtained by three applications.
[0062]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the surface area in the front-end | tip part of a needle | hook is made smaller than before by making the angle which the front-end | tip surface of the needle | hook for defect correction of a color filter and the front-end | tip side wall make in the range of 80-100 degree. Therefore, when the needle is separated from the color filter, the amount of the composition for a color filter film that is not applied to the defect removing portion and lifted together with the needle can be reduced. Therefore, the amount of the composition for a color filter film applied in one process increases, and the labor required for correction can be reduced. Further, when the needle is pushed into the defect removing portion, the range in which the composition for a color filter film spreads along the tip side wall of the needle is narrowed, so that the effect of minimizing the coating diameter is also achieved.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing an example of a tip portion of a defect correction needle of a color filter of the present invention.
FIG. 2 is a schematic sectional view showing an example of a tip portion of a conventional needle for defect correction of a color filter.
FIG. 3 is a process chart showing an example of a method for manufacturing a color filter of the present invention.
FIG. 4 is a process chart showing an example of a correction process of the present invention.
[Explanation of symbols]
Reference numeral 1 denotes a tip flat surface of the color filter defect correction needle 2... A tip side wall 3 of the color filter defect correction needle 3... Angle formed

Claims (3)

Attach the color filter film composition to the tip, apply it in contact with the color filter defect removal location, apply and cure the color filter defect correction needle to correct the color filter defect,
A defect correcting needle for a color filter, characterized in that an angle formed by a tip flat surface and a tip side wall of the defect correcting needle of the color filter is within a range of 80 ° to 100 °. The needle for correcting a defect of a color filter according to claim 1, wherein the angle of the needle for correcting a defect of the color filter is in a range of 90 ° to 95 °. A defect detecting step of detecting a defect present in the color filter; a defect removing step of irradiating a laser beam to a region where the defect detected in the defect detecting step is present to remove the defect together with a color filter film; 3. A method for manufacturing a color filter, comprising: a correction step of applying and curing a composition for a color filter film to correct a defect of white spots generated by the removal step, wherein the correction step is performed according to claim 1 or 2. A step of attaching a color filter film composition to the tip of a needle for defect correction of the color filter, applying the color filter film in contact with a defect removal portion of the color filter, and curing the color filter to correct the defect. A method of manufacturing a color filter.

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