KR101133072B1 - Method for repairing color filter - Google Patents

Abstract

A repair method of a color filter is disclosed. The repair method of the color filter according to the present invention comprises the steps of: (a) providing a substrate (100); (b) forming a plurality of black matrices 200 on the substrate 100; (c) forming a color filter 300 between every black matrix 200 on the substrate 100; (d) irradiating laser to the protrusions 310 and the pinholes 320 formed on the color filter 300 to form grooves 330; And (e) forming the repair material 340 in the groove 330.

Protrusion, pinhole, laser mask, repair, color filter

Description

Repair method of color filter {METHOD FOR REPAIRING COLOR FILTER}

The present invention relates to a repair method of a color filter. More particularly, the present invention relates to a color filter repair method capable of repairing protrusions and pin hole defects in a single process.

Recently, as the demand for displays such as mobile phones, laptops, personal digital assistants (PDAs), and large TVs increases, thin and light flat panel display technologies are rapidly developing.

Such flat panel displays include a liquid crystal display (LCD) and an organic light emitting diode display (OLED). Among these, a manufacturing process of a liquid crystal display (LCD) is large. And a substrate cleaning process, a substrate manufacturing process, a substrate bonding / liquid crystal injection process, and a mounting process.

In the manufacturing process of such a liquid crystal display device, a substrate manufacturing process is further divided into a manufacturing process of a color filter substrate which is an upper substrate, and a manufacturing process of a thin film transistor substrate which is a lower substrate.

1A to 1C are cross-sectional views of a color filter showing a manufacturing step of a conventional color filter substrate.

1A to 1C, a method of manufacturing a color filter substrate includes forming a black matrix 20 having a predetermined pattern on a substrate 10, and forming a red (red) on the substrate 10 between the black matrices 20. 30a), forming color filters 30 of green 30b and blue 30c, forming a common electrode 40 over the entire substrate 10, and forming an alignment layer 50 on the common electrode 40. Forming a step).

At this time, the color filter 30 transmits light of a specific wavelength band, thereby displaying red, green, and blue. In a conventional color filter substrate manufacturing process, a thin film defect such as pinholes and / or protrusions is formed when the color filter 30 is formed. It was the biggest problem that occurred.

Referring to the reason why pinholes and / or protrusion defects occur in the process of forming the color filter 30 as described above, in order to form the R, G, and B color filters 30, the third process (R, G) is performed independently. It is because the color filter formation process of (B) is needed. In other words, after the R color filter 30a is formed, the G color filter forming step 30b and the B color filter forming step 30c are respectively performed. Therefore, the foreign matter generated in each color filter forming step affects the color filter 30 in other processes. In particular, since the dyeing method and the pigment dispersion method are formed by a photolithography process using a photoresist, residues of the photoresist may cause pinholes and / or protrusion defects in the color filter 30 of the next process.

In general, a method of removing the protrusions is a method of polishing the protrusions using a polishing apparatus, and a method of removing the pinholes uses a method of filling a predetermined ink after removing a predetermined region with a laser apparatus. It is becoming.

However, in the related art, it is difficult to repair the color filter in a single process because both the polishing apparatus and the laser apparatus must be used according to the defect as described above, thereby increasing the time and cost of the repair process.

In particular, the method of polishing and removing the projections with a polishing apparatus is not possible to determine the alignment of the projections and the polishing apparatus in the first place due to the structure of the polishing apparatus, and at the same time, it is not possible to determine the status of the projections during the polishing process. After measuring the height of the process, the process of polishing the protrusions to a certain depth and measuring the height of the protrusions again with a measuring instrument were repeated. Therefore, the polishing process of the projections has a problem in that the accuracy of polishing decreases due to the repetitive process and the processing time increases dramatically, resulting in a decrease in productivity of the repair process.

The present invention is to solve the above problems of the prior art, it is an object of the present invention to provide a repair method of the color filter to repair the pinhole and projection defects in a single process.

In addition, another object of the present invention is to provide a repair method of a color filter that rotates one laser mask so as to easily control the irradiation range of the laser.

The object of the present invention is to provide a substrate comprising: (a) providing a substrate; (b) forming a plurality of black matrices on the substrate; (c) forming a color filter between every black matrix on the substrate; (d) forming a groove by irradiating a laser to the protrusion and the pinhole formed on the color filter; And (e) forming a repair material in the groove.

First, the irradiation range of the laser is a repair method of a color filter, characterized in that a plurality of openings having different sizes through which the laser passes are formed and controlled by a rotating laser mask.

The irradiation range of the laser is a repair method of a color filter, characterized in that as the laser mask rotates.

The repair material is a method of repairing a color filter, characterized in that the injection or transfer.

Finally, the repair material is a repair method of a color filter, characterized in that the same as the color filter.

According to the present invention, since pinholes and protrusion defects can be repaired in a single process, process time and cost can be saved, and further, reliability of the color filter can be improved.

In addition, according to the present invention, since the laser can be irradiated to a suitable range for each pinhole and protrusion defect using one laser mask, there is an effect that the repair process can be efficiently performed.

DETAILED DESCRIPTION The following detailed description of the invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled. In the drawings, like reference numerals refer to the same or similar functions throughout the several aspects, and length, area, thickness, and the like may be exaggerated for convenience.

In the following preferred embodiment of the present invention, for convenience of description, an example in which a protrusion is formed in the red color filter and a pinhole is formed in the green color filter in the color filter forming process will be described as a repair method of the color filter of the present invention. The present invention is not limited thereto.

 [Preferred Embodiments of the Invention]

2A to 2E are cross-sectional views of a color filter illustrating a repair step of a color filter according to an embodiment of the present invention.

First, referring to FIGS. 2A through 2E, first, a plurality of black matrices 200 are formed in a predetermined pattern on a substrate 100, and red (300a) and green (between black matrices 200 on the substrate 100 are formed. 300b) and the blue color filter 300c are formed. At this time, in one embodiment of the present invention, the projection 310 is formed on the red color filter 300a due to foreign matter or process defect (for example, equipment operation failure, material defect, etc.), and on the green color filter 300b. The pinhole 320 may be formed.

Subsequently, an inspection process for detecting the protrusion 310 and the pinhole 320 is performed. As the inspection method, a technique for determining a defective position by analyzing image information, which is a known technique, may be used. The detailed description is omitted.

Subsequently, when the defective position is identified, the laser mask 600 according to the embodiment of the present invention is aligned to the corresponding position, and then the projection 310 and the pinhole 320 are removed by irradiating a predetermined laser. At this time, the grooves 330 are formed by removing a predetermined region of the R and G color filters 300a and 300b including the protrusions 310 and the pinholes 320 with a laser, and preferably the protrusions than the pinholes 320. The first opening 610 in which the laser irradiation area is smaller than the second opening 620 may be aligned with the 310. This is because it is more efficient to focus the laser in a narrower irradiation range than the pinhole 320 in order to remove the protrusion 310, a more detailed description will be clearly understood by the following detailed description with reference to FIG. 3.

Subsequently, the color filter 300 may be planarized by filling the groove 330 with the repair material 340. In this case, the repair material 340 may be a curable material that may be completely fixed to the color filter 300 through an additional curing process (not shown) after being injected by a nozzle (not shown) in the form of ink. However, when the general curable material is used as the repair material 340, the inherent color of the color filter 300 may be lowered. In one embodiment of the present invention, a technique known as a film of the same material as the color filter 300 may be used. It can also be formed by transferring by a lamination method.

Subsequently, the common electrode 400 is formed on the entire upper portion of the substrate 100, and the alignment layer 500 is formed on the entire upper portion of the common electrode 400, thereby repairing the color filter according to an embodiment of the present invention. The process can be carried out.

Laser mask

3 is a plan view of a laser mask according to an embodiment of the present invention.

Referring to FIG. 3, a plurality of openings 610 to 640 are formed in the laser mask 600 according to an embodiment of the present invention, and the irradiation range of the laser to be irradiated is determined according to the sizes of these openings. For example, when the first opening 610 is used, defects in the protruding shape such as the protrusion 310 of FIG. 2A may be easily removed. In addition, when the second opening 620 having a larger size than the first opening 610 is used as an example, a defect in the shape of a groove such as the pinhole 320 of FIG. 2A may be easily removed.

Therefore, the laser mask 600 may be rotated according to the type and size of the defects to align the appropriate openings 610 to 640 to perform an effective repair process, and the irradiation range of the laser may be sequentially applied to the same defects (protrusions and pinholes). You can also control the removal rate and range by irradiating with.

As described above, the repair method of the color filter according to the present invention can repair pinholes and protrusion defects in a single process, thereby saving process time and cost.

Particularly, according to the present invention, since the process of repairing protrusion defects can be omitted through the polishing process when the color filter is repaired, the productivity of the repair process caused by the structure of the conventional polishing apparatus described above can be solved. have. That is, according to the present invention, since the process of polishing the process which requires the most time for repairing the color filter is unnecessary, the productivity of the repair process is greatly improved, that is, the tact time of the repair process is significantly reduced. You can.

In the present invention, on the other hand, protrusion repair may be performed only for protrusions whose height exceeds a predetermined reference value. This is because protrusions having a predetermined size or less among protrusions generated in the color filter may not cause process defects during the bonding process of the upper and lower plates of the liquid crystal display panel in the future even without repair. Therefore, in the present invention, it is possible to further reduce the tact time of the repair process by setting a reference value for the height of the projection to perform the projection repair and omitting the projection repair for the projection having a height below the reference value. have.

Although the present invention has been shown and described with reference to preferred embodiments as described above, it is not limited to the above embodiments and various modifications made by those skilled in the art without departing from the spirit of the present invention. Modifications and variations are possible. Such modifications and variations are intended to fall within the scope of the invention and the appended claims.

1A to 1C are cross-sectional views of a color filter showing a manufacturing step of a conventional color filter substrate.

2A to 2E are cross-sectional views of a color filter illustrating a repair step of a color filter according to an embodiment of the present invention.

3 is a plan view of a laser mask according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: substrate

200: black matrix

300: color filter

310: turning

320: pinhole

330: home

340: repair material

400: common electrode

500: alignment layer

600: laser mask

Claims (5)

(a) providing a substrate; (b) forming a plurality of black matrices on the substrate; (c) forming a color filter between every black matrix on the substrate; (d) forming a groove by irradiating a laser to the protrusion and the pinhole formed on the color filter; And (e) forming a repair material in the groove Including, In the step (d), the laser is irradiated using a rotating laser mask having a plurality of openings having different sizes through which the laser passes. When irradiating a laser to the pinhole, the laser is irradiated to the protrusion. Use larger openings than usual, In the step (e), the repair material is formed by being injected into the groove by an inkjet method using a nozzle, The projection method of the color filter, characterized in that for repairing the projection and the pinhole in a single process. delete delete delete The method of claim 1, And the repair material is the same as the color filter.

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