WO2008156286A1

WO2008156286A1 - Method of repairing flat pannel display

Info

Publication number: WO2008156286A1
Application number: PCT/KR2008/003416
Authority: WO
Inventors: Il Ho Kim
Original assignee: Cowindst Co., Ltd.
Priority date: 2007-06-18
Filing date: 2008-06-17
Publication date: 2008-12-24

Abstract

Disclosed herein is a method of repairing a bright pixel defect of a display device that is capable of effectively repairing a bright pixel defect of a display device using laser. When the display device includes black matrices, the method includes forming a gap at a color filter having a bright pixel defect or between the color filter and a glass using laser, and decomposing black matrices neighboring to the color filter using laser.

Description

[DESCRIPTION] [Invention Tit Ie]

METHOD OF REPAIRING FLAT PANNEL DISPLAY [Technical Field]

<i> The present invention relates to a method of repairing a bright pixel defect of a display device, and, more particularly, to a method of repairing a bright pixel defect of a display device that is capable of effectively repairing a bright pixel defect of a display device using laser. [Background Art]

<2> In recent years, liquid crystal displays have been in the spotlight as a next-generation high-technology display device which has low power consumption and high portability, is technology-intensive, and is highly value-added. Among them, an active matrix type liquid crystal display including a switching device for switching voltage applied for each pixel has attracted the greatest attention because of its high resolution and excellent motion picture implementation.

<3> Referring to FIG. 1, a liquid crystal panel 500 is constructed in a structure in which a color filter substrate 530, which is an upper substrate, and a thin film transistor (TFT) array substrate 510, which is a lower substrate, are joined to each other while being opposite to each other, and a liquid crystal layer 520 is disposed between the substrates. The liquid crystal panel 500 is driven in a way in which TFTs attached to hundreds of thousands of pixels are switched, through address wires for pixel selection, to apply voltage to corresponding pixels. Here, the color filter substrate 530 includes a glass 531, red/green/blue (RGB) color filters 532, black matrices 533 formed between the color filters 532, an overcoat layer, an indium tin oxide (ITO) film 535 for a common electrode, and an alignment film 536. To the top of the glass is attached a polarizing plate 537.

<4> A thin film transistor array substrate process, a color filter substrate process, and a liquid crystal cell process are performed to manufacture such a liquid crystal pane. <5> The thin film transistor array substrate process is a process for repeatedly performing deposition, photolithography, and etching to form gate wires, data wires, thin film transistors, and pixel electrodes on the glass substrate.

<6> The color filter substrate process is a process for manufacturing RGB color filters which are arranged on a glass having black matrices in a predetermined sequence to implement colors and forming an ITO film for a common electrode.

<7> The liquid crystal cell process is a process for joining the thin film transistor array substrate and the color filter substrate, such that a predetermined gap is maintained between the thin film transistor array substrate and the color filter substrate, and injecting liquid crystal into the gap between the thin film transistor array substrate and the color filter substrate, to form a liquid crystal layer. Alternatively, in recent years, there has been used a one drop filling (ODF) process for uniformly applying liquid crystal to the thin film transistor array substrate and then joining the thin film transistor array substrate and the color filter substrate.

<8> At the time of inspecting such a liquid crystal display, a test pattern is displayed on a screen of the liquid crystal panel to detect whether a defective pixel exists. When the defective pixel is found, a process for repairing the defective pixel is carried out. Liquid crystal defects may include a spot defect, a line defect, and display nonuniformity. The spot defect may occur due to poor TFT devices, poor pixel electrodes, or poor color filter wires. The line defect may occur due to an open circuit between wires, a short circuit between wires, breakdown of TFTS by static electricity, or poor connection with a drive circuit. The display nonuniformity may occur due to nonuniform cell thickness, nonuniform liquid crystal alignment, TFT distribution at specific places, or relatively large wire time constant .

<9> Among them, the spot defect and the line defect generally occur due to poor wires. In the conventional art, when open-circuit wires are found, the open-circuit wires are merely connected to each other, and, when short- circuit wires are found, the short-circuit wires are merely separated from each other.

<io> In addition to above-described defects, impurities, including dust, organic matter, metal, etc., may be adsorbed to the liquid crystal panel, during the manufacture of the liquid crystal panel. When such impurities are adsorbed to the region near some color filters, pixels corresponding to the color filters emit much brighter light than the brightness of the remaining normal pixels, which is called a light-leakage phenomenon. A method of using laser to repair such a bright pixel defect is now under study.

<π> Japanese Patent Application Publication No. 2006-72229 discloses a technology for irradiating laser to an alignment film, such that the alignment film is damaged, to weaken an arrangement property of liquid crystal and thus lower light transmittance of the liquid crystal, thereby eliminating a light-leakage phenomenon. However, this technology has problems in that it is not possible to completely eliminate the arrangement property of liquid crystal, and a large amount of time is required to complete the process.

<i2> In order to solve the above-mentioned problems, Korean Patent Application No. 10-2006-86569 has been filed in the name of the applicant of the present application. This patent application discloses a method of blackening a defective pixel using femtosecond laser.

<i3> When the femtosecond laser is used, it is possible to efficiency blackening the defective pixel; however, there is a problem in that equipment for oscillating the femtosecond laser is very expensive. [Disclosure] [Technical Problem]

<i4> Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a method of repairing a bright pixel defect of a display device that is capable of effectively repairing a bright pixel defect of a display device using laser. [Technical Solution]

<15> In accordance with the present invention, the above and other objects can be accomplished by the provision of a method of repairing a bright pixel defect of a display device including black matrices, the method including forming a gap at a color filter having a bright pixel defect or between the color filter and a glass using laser, and decomposing black matrices neighboring to the color filter using laser.

<16> Preferably, when no polarizing plate is attached to the display device, and the color filter is a red (R) region, the gap forming step is carried out using laser having a wavelength of 270 to 550 nm. When no polarizing plate is attached to the display device, and the color filter is a green (G) region, the gap forming step is carried out using laser having a wavelength of 270 to 480 nm or 600 to 750 nm. Also, when no polarizing plate is attached to the display device, and the color filter is a blue (B) region, the gap forming step is carried out using laser having a wavelength of 270 to 390 nm or 520 to 750 nm.

<i7> Preferably, when a polarizing plate is attached to the display device, and the color filter is a red (R) region, the gap forming step is carried out using laser having a wavelength of 400 to 550 nm. When a polarizing plate is attached to the display device, and the color filter is a green (G) region, the gap forming step is carried out using laser having a wavelength of 400 to 480 nm or 600 to 750 nm. Also, when a polarizing plate is attached to the display device, and the color filter is a blue (B) region, the gap forming step is carried out using laser having a wavelength of 520 to 750 nm.

<18> Preferably, the laser has a pulse duration of 100 ns or less at the gap forming step, and the laser has a repetitive frequency of 1 Hz to 1 kHz at the gap forming step.

<i9> Preferably, when the display device has no overcoat layer, the laser has a pulse duration of 50 ns or less at the gap forming step. When the display device has no overcoat layer, the laser has a repetitive frequency of 1 Hz to 100 Hz at the gap forming step. Also, when the display device has no overcoat layer, the laser has a power of 10 mW or less at the gap forming step.

<20> Preferably, the method further includes adjusting the intensity of the laser at the gap forming step.

<2i> Preferably, the laser has a flat top profile at the gap forming step.

<22> Preferably, the gap has a thickness equivalent to 20 % to 90 % of the thickness of the color filter at the gap forming step.

<23> Preferably, at the gap forming step, the laser is created using at least one selected from a group consisting of Ytterbium laser, Ti-Sapphire laser, Nd:YLF laser, Nd:Glass laser, Nd:Vanadate (YV04) laser, Nd:YAG laser, Fiber laser, and Dye laser.

<24> Preferably, when the black matrices contain a metal ingredient, the laser has a pulse duration of 50 ns or less at the black matrices decomposing step.

<25> Preferably, when no polarizing plate is attached to the display device, the black matrices decomposing step is carried out using laser having a wavelength of 270 to 750 nm. On the other hand, when a polarizing plate is attached to the display device, the black matrices decomposing step is carried out using laser having a wavelength of 400 to 750 nm.

<26> Preferably, the black matrices decomposing step is carried out using the laser used at the gap forming step.

<27> Preferably, the method further includes diffusing the decomposed black matrices in the gap. In this case, the decomposed black matrices diffusing step may include moving laser toward the color filter to guide the flow of the black matrices toward the color filter. Preferably, the decomposed black matrices diffusing step is carried out using the laser used at the black matrices decomposing step or laser having the same specification as the laser used at the black matrices decomposing step. In this case, the laser may be irradiated to the color filter or the black matrices by a scan type laser irradiation method, a block shot type laser irradiation method, or a multi block shot type laser irradiation method. <28> Preferably, the light transmittance of the color filter lowers during the execution of the gap forming step, the black matrices decomposing step, and the decomposed black matrices diffusing step.

<29>

[Advantageous Effects] <3i> According to the present invention, as apparent from the above description, it is possible to effectively repair a bright pixel defect of a display device using laser. <32> In particular, it is possible to form a gap at a color filter having a bright pixel defect, thereby effectively diffusing black matrices. <33> Also, the black matrices are decomposed and diffused at the defective region of the color filter along with the blackening of the color filter, whereby it is possible to more effectively repairing a bright pixel defect of a display device. <34> Furthermore, it is possible to very effectively form a gap depending upon whether or not a polarizing plate is provided, whether or not an overcoat layer is provided, and the properties of a color filter.

[Description of Drawings] <35> The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: <36> FIG. 1 is a sectional view illustrating a liquid crystal panel containing impurities; <37> FIG. 2 to 4 is a view illustrating a method of repairing a bright pixel defect according to an embodiment of the present invention! <38> FIG. 5 is a view illustrating a method of repairing a bright pixel defect according to another embodiment of the present invention; <39> FIG. 6 is a graph illustrating transmittance of a color filter according to its wavelength; <40> FIG. 7 is a graph illustrating transmittance of a polarizing plate according to its wavelength; <4i> FIGS. 8 to 10 are views illustrating various laser irradiation methods for forming a gap; <42> FIG. 11 is a view illustrating a process for irradiating laser while adjusting the focal distance; <43> FIG. 12 is a sectional view illustrating a liquid crystal panel having no overcoat layer; <44> FIG. 13 is a graph illustrating light absorption of an overcoat layer; and <45> FIG. 14 is a graph illustrating a laser beam profile (shape) according to the present invention.

<46>

[Best Mode]

<47> Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<48> Referring to FIG. 2, laser is wholly irradiated to a color filter 532 confirmed to have a bright pixel defect, while the laser is scanned on the color filter along an arrow in a zigzag fashion, to form a gap G between the color filter 532 and a glass 531 (see FIG. 1). Of course, the gap G may be formed in the thickness direction of the color filter 532 as well as between the color filter 532 and the glass.

<49> Subsequently, as shown in FIG. 3, laser is irradiated to black matrices 533, while the laser is scanned on the black matrices, to decompose the black matrices 533. The decomposed black matrices 533 are introduced into the gap G.

<50> Finally, as shown in FIG. 4, laser is irradiated to the black matrices 533 and the color filter 532, while the laser is scanned on the black matrices and the color filter in a zigzag fashion, to accelerate the decomposition of the black matrices 533 and the diffusion of the decomposed black matrices 533, with the result that the decomposed black matrices 533 are uniformly distributed in the gap G.

<5i> As a result of the uniform distribution of the black matrices 533 in the gap G, the light transmittance of the color filter 532 lowers, with the result that the color filter 532 does not transmit but absorbs light generated from a light source (a backlight unit) of a display device. In this way, the defective color filter is repaired such that the bright pixel of the defective color filter becomes a dark pixel.

<52>

[Mode for Invention]

<53> When energy necessary to form the gap G and energy necessary to decompose the black matrices 533 are almost the same according to the characteristics of the display device, the gap forming process and the black matrices decomposing process may be carried out almost at the same time, unlike the above description. Referring to FIG. 5, laser is irradiated to the black matrices 533 and the color filter 532, which the laser is sequentially scanned on the black matrices 533 and the color filter 532, to repair a bright pixel defect. That is, the decomposition and diffusion of the black matrices 533 and the forming of the gap G are sequentially but almost simultaneously carried out.

<54> Meanwhile, as previously described, laser for forming the gap, laser for decomposing the black matrices, and laser for diffusing the decomposed black matrices into the gap are needed to repair a bright pixel defect according to the present invention.

<55> In particular, it is required for the gap forming laser to satisfy process conditions, such as kind of the color filter, whether or not the display device has a polarizing plate, whether or not the display device has an overcoat layer, etc. Laser satisfying such process conditions may decompose the black matrices and diffuse the decomposed black matrices in the gap. Consequently, the gap forming laser may be commonly used except in a particular case.

<56> Hereinafter, the specification of the gap forming laser will be described.

<57> When laser is irradiated to an organic film, such as a color filter, molecular coupling of organic matter constituting the film is broken, with the result that the organic film is ablated while emitting radicals, clusters, electrons, and photons, including plasma comprising neutral atoms, molecules, and positive and negative ions, whereby a gap is formed at the color filter.

<58> Ablation is a phenomenon in which organic matter is decomposed into molecules and ions due to the dissociation of the molecular coupling of the organic matter. In order to achieve such dissociation, however, it is required to absorb energy greater than the energy level of the organic matter.

<59> Consequently, it is required for laser to be irradiated with a wavelength having low transmittance, i.e., a wavelength having high absorptivity, of a color filter at which a gap is to be formed.

<60> This wavelength is selected with reference to FIG. 6. For example, when a color filter is a red (R) region, it can be seen that a wavelength having high absorptivity of the red region is 550 nm or less. When laser having a wavelength of more than 550 nm is irradiated to the red (R) region, the transmittance is high, and therefore, a larger amount of energy is needed, with the result that several film layers, such as an overcoat layer, an ITO film, and an alignment film, below the color filter may be seriously damaged. If the film layers below the color filter are damaged, liquid crystal comes up to the damaged regions, with the result that bubbles are generated, which leads to more serious defect of the color filter.

<6i> Meanwhile, laser having a wavelength of less than 270 nm is not transmitted through the glass, with the result that the laser does not reach the color filter. Laser having a wavelength of more than 750 nm is transmitted through the color filter, with the result that the laser does not react on the color filter.

<62> In conclusion, when a color filter at which a gap is to be formed is a red region, it is preferred for laser having a wavelength of 270 to 550 nm to be irradiated to the color filter, whereby it is possible to very effectively form a gap at the color filter without the damage to the film layers below the color filter.

<63> In this way, when such a gap is to be formed at the color filter, it is required to irradiate laser having a wavelength of low color filter transmittance. For a red (R) region, it is preferred to irradiate laser having a wavelength of 270 to 550 nm, as previously described. For a green (G) region, it is preferred to irradiate laser having a wavelength of 270 to 480 nm or 600 to 750 nm. For a blue (B) region, it is preferred to irradiate laser having a wavelength of 270 to 390 nm or 520 to 750 nm.

<64> In a structure in which a polarizing plate is attached to the display device, it is required to refer to the transmittance graph of FIG. 7, which illustrates transmittance of a polarizing plate according to its wavelength. As shown in FIG. 1, a polarizing plate is attached to the top of a color filter substrate. Laser irradiated must be transmitted through the polarizing plate.

<65> It can be seen from the transmittance graph of FIG. 7 that the polarizing plate has a transmittance of 50% or less at a visible ray region, the polarizing plate has no transmittance at an ultraviolet (UV) region, and the transmittance of the polarizing plate increases toward a near infrared region. For this reason, it is preferred to use laser having a wavelength of 400 nm or more when it is needed to form a gap at any one of the RGB filters of the panel to which the polarizing plate is attached.

<66> Consequently, it is necessary to exclude a wavelength of less than 400 nm from a wavelength derived from the graph of FIG. 6 to form a gap needed to repair the display device to which the polarizing plate is attached. In conclusion, when a color filter at which a gap is to be formed is a red (R) region, it is preferred for laser having a wavelength of 400 to 550 nm to be irradiated to the color filter. When a color filter at which a gap is to be formed is a green (G) region, it is preferred for laser having a wavelength of 400 to 480 nm or 600 to 750 nm to be irradiated to the color filter. When a color filter at which a gap is to be formed is a blue (B) region, it is preferred for laser having a wavelength of 520 to 750 nm to be irradiated to the color filter.

<67> FIGS. 8 to 10 are views illustrating various methods of irradiating laser to a color filter. Specifically, FIG. 8 illustrates a scan type laser irradiation method, FIG. 9 illustrates a block shot type laser irradiation method, and FIG. 10 illustrates a multi block shot type laser irradiation method.

<68> Here, the scan type laser irradiation method is to scan laser having a beam size corresponding to a portion of area of a color filter 532 to irradiate the laser to the entire area of the color filter 532. The block shot type laser irradiation method is to irradiate laser having a beam size corresponding to the entire area of the color filter 532 at once. The multi block shot type laser irradiation method is a combination of the scan type laser irradiation method and the block shot type laser irradiation method. That is, the multi block shot type laser irradiation method is to irradiate laser according to the block shot type laser irradiation method and, at the same time, continuously irradiate laser according to the scan type laser irradiation method.

<69> Meanwhile, when laser is irradiated according to the above-described methods, the light transmittance of the color filter lowers, irrespective of the diffusion of the black matrices, during the ablation of the color filter. Consequently, a bright pixel of the color filter becomes a dark pixel, with the result that that the color filter does not transmit but absorbs light generated from a light source (a backlight unit) of a display device, whereby it is possible to more effectively repair a bright pixel defect of the color filter along with the diffusion of the black matrices.

<70> Referring to FIG. 11, there is illustrated a process for irradiating laser several times to form a gap.

<7i> Specifically, when laser is firstly irradiated (Sl), a Z-axis moving scanner is used to locate a depth of focus (DOF) at a region corresponding to 10 % of the thickness of the color filter, and then a gap is formed at the color filter using an XY-axis moving scanner. When the state of the gap formed at the color filter is confirmed by a charge coupled device (CCD) camera, and it is determined that the gap is not sufficiently formed at the color filter, the Z-axis moving scanner is driven, such that the DOF is located at a region corresponding to 20 % of the thickness of the color filter, and then laser is secondly irradiated (S2) using the XY-axis moving scanner. When this process is repeatedly carried out 2 to 4 times, it is possible to form the gap at the color filter to a desired degree. <72> The depth of focus (DOF) is calculated by the focal distance between the Z-axis moving scanner and a scanning lens and the diameter of an incident beam within a range of 2 μm or less. <73> [Mathematical equation 1] <74> DOF = λ/2(NA)2 <75> [Mathematical equation 2] <76> NA = nsinθ <77> [Mathematical equation 3] <78> f/# = 1/2(NA) <79> [Mathematical equation 4] <80> f/# = efl/φ <8i> Mathematical equation 5 may be derived from a combination of

Mathematical equation 3 and Mathematical equation 4. <82> [Mathematical equation 5] <83> NA = φ/2(efl) <84> In the mathematical equations above, NA indicates an effective numerical aperture, λ (lambda) indicates a wavelength of laser, and efl indicates effective focal length. <85> It can be confirmed that the larger the diameter of an incident beam is and the shorter the wavelength of laser is, the shallower the depth of focus

(DOF) is. It can be also confirmed that the shorter the focal distance (efl) of the lens is, the larger the numerical aperture (NA) is, and therefore, the shallower the depth of focus (DOF) is. <86> It is preferred for the thickness of the gap to be less than 90 % to the maximum, preferably 20 to 40 %, of the thickness of the color filter.

Alternatively, it is possible to form a plurality of gaps at different thickness parts of the color filter. <87> Referring to FIG. 12, there is illustrated a display device having no overcoat layer to reduce the manufacturing costs and simplify the manufacturing process.

<88> Meanwhile, an overcoat layer has a light absorptivity as shown in FIG. 13. It can be seen from FIG. 13 that transmission is little achieved at a region below an ultraviolet (UV) region, and approximately 80 % of absorption and approximately 20 % of transmission are achieved at the UV region.

<89> Consequently, when a gap is to be formed at a display device having no overcoat layer, it is required to use laser having a specification different from that of laser used for a display device having an overcoat layer. This is because energy generated from laser irradiated is absorbed by the overcoat layer. For a display device having no overcoat layer, therefore, energy, transmitted through a color filter, reaches a liquid crystal layer, with the result that the liquid crystal layer may be damaged.

<90> For this reason, it may be possible to use laser having low energy to prevent the damage to the liquid crystal layer; however, in this case, no reaction can occur.

<9i> Consequently, in consideration of the above problem, conditions in which laser has low energy and energy application time is short must be satisfied. Experiment results revealed that a gap was satisfactorily formed when laser having a plus duration of 50 ns or less, a repetitive frequency of 1 Hz to 100 Hz, and a power of 10 mW or less was used.

<92> The specification of laser may be selected, according to the above- described process conditions, to form the gap.

<93> Also, it is possible to decompose black matrices and diffuse the decomposed black matrices in the gap using the gap forming laser.

<94> In a case in which a metal ingredient, such as titanium, is contained in the black matrices, however, it is particularly preferred to use laser having a pulse duration of 50 ns or less to effectively decompose the black matrices.

<95> FIG. 14 is a graph illustrating a laser beam profile according to the IO

present invention.

<96> Laser oscillated from a laser oscillator is a Gaussian type laser beam of which energy concentrates on a central region. When this laser beam passes through a beam shaper or a beam homogenizer, the intensity of the laser beam is uniformalized at a specific range, with the result that the laser beam is converted into a flat top profile of an expanded size. At this time, the area of the laser irradiated is also changed along with the change of the beam profile. The flat top profile may be changed into the shape of a rectangular flat top 300 or a circular flat top 301.

<97> It is possible to change the magnitude and intensity of the laser beam irradiated using the beam shaper and a beam adjustor. The smaller the area of the laser beam irradiated is, the more time is required to form gaps at a plurality of color filters. The magnitude of the laser beam may be uniformly converted to increase gap forming speed, whereby the present invention is applicable to a production line to mass-produce products. The laser converted into the rectangular flat top 300 or the circular flat top 301 having appropriate intensity can form gaps at color filters to a desired thickness and at a thickness-direction position by the Z-axis moving scanner.

<98> Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

<99>

Claims

[CLAIMS] [Claim 1] <ioi> A method of repairing a bright pixel defect of a display device including black matrices, the method comprising: <iO2> forming a gap at a color filter having a bright pixel defect or between the color filter and a glass using laser; and <iO3> decomposing black matrices neighboring to the color filter using laser.

<104>

[Claim 2]

<iO5> The method according to claim 1, wherein, when no polarizing plate is attached to the display device, and the color filter is a red (R) region, the gap forming step is carried out using laser having a wavelength of 270 to 550 nm.

[Claim 3]

<iO6> The method according to claim 1, wherein, when no polarizing plate is attached to the display device, and the color filter is a green (G) region, the gap forming step is carried out using laser having a wavelength of 270 to 480 nm or 600 to 750 nm.

[Claim 4]

<iO7> The method according to claim 1, wherein, when no polarizing plate is attached to the display device, and the color filter is a blue (B) region, the gap forming step is carried out using laser having a wavelength of 270 to 390 nm or 520 to 750 nm.

[Claim 5]

<i08> The method according to claim 1, wherein, when a polarizing plate is attached to the display device, and the color filter is a red (R) region, the gap forming step is carried out using laser having a wavelength of 400 to 550 nm.

[Claim 6]

<iO9> The method according to claim 1, wherein, when a polarizing plate is attached to the display device, and the color filter is a green (G) region, the gap forming step is carried out using laser having a wavelength of 400 to 480 nm or 600 to 750 run.

[Claim 7]

<πo> The method according to claim 1, wherein, when a polarizing plate is attached to the display device, and the color filter is a blue (B) region, the gap forming step is carried out using laser having a wavelength of 520 to 750 nm.

[Claim 8]

<iii> The method according to claim 1, wherein the laser has a pulse duration of 100 ns or less at the gap forming step.

[Claim 9]

<ii2> The method according to claim 1, wherein the laser has a repetitive frequency of 1 Hz to 1 kHz at the gap forming step.

[Claim 10]

<ii3> The method according to claim 1, wherein, when the display device has no overcoat layer, the laser has a pulse duration of 50 ns or less at the gap forming step.

[Claim 11]

<ii4> The method according to claim 1, wherein, when the display device has no overcoat layer, the laser has a repetitive frequency of 1 Hz to 100 Hz at the gap forming step.

[Claim 12]

<ii5> The method according to claim 1, wherein, when the display device has no overcoat layer, the laser has a power of 10 mW or less at the gap forming step.

[Claim 13]

<ii6> The method according to claim 1, further comprising: <ii7> adjusting the intensity of the laser at the gap forming step.

[Claim 14]

<118> The method according to claim 1, wherein the laser has a flat top profile at the gap forming step. Io

[Claim 15]

<ii9> The method according to claim 1, wherein the gap has a thickness equivalent to 20 % to 90 % of the thickness of the color filter at the gap forming step.

[Claim 16]

<i20> The method according to claim 1, wherein, at the gap forming step, the laser is created using at least one selected from a group consisting of Ytterbium laser, Ti-Sapphire laser, Nd:YLF laser, Nd:Glass laser, Nd:Vanadate (YV04) laser, Nd:YAG laser, Fiber laser, and Dye laser.

[Claim 17]

<i2i> The method according to claim 1, wherein, when the black matrices contain a metal ingredient, the laser has a pulse duration of 50 ns or less at the black matrices decomposing step.

[Claim 18]

<122> The method according to claim 1, wherein, when no polarizing plate is attached to the display device, the black matrices decomposing step is carried out using laser having a wavelength of 270 to 750 nm.

[Claim 19]

<123> The method according to claim 1, wherein, when a polarizing plate is attached to the display device, the black matrices decomposing step is carried out using laser having a wavelength of 400 to 750 nm.

[Claim 20]

<124> The method according to claim 18 or 19, wherein the black matrices decomposing step is carried out using the laser used at the gap forming step.

[Claim 21]

<125> The method according to claim 1, further comprising: <i26> diffusing the decomposed black matrices in the gap.

[Claim 22]

<127> The method according to claim 21, wherein the decomposed black matrices diffusing step includes moving laser toward the color filter to guide the flow of the black matrices toward the color filter.

[Claim 23]

<i28> The method according to claim 22, wherein the decomposed black matrices diffusing step is carried out using the laser used at the black matrices decomposing step or laser having the same specification as the laser used at the black matrices decomposing step.

[Claim 24]

<129> The method according to claim 22, wherein the laser is irradiated to the color filter or the black matrices by a scan type laser irradiation method.

[Claim 25]

<13O> The method according to claim 22, wherein the laser is irradiated to the color filter or the black matrices by a block shot type laser irradiation method or a multi block shot type laser irradiation method.

[Claim 26]

<i3i> The method according to claim 22, wherein the light transmittance of the color filter lowers during the execution of the gap forming step, the black matrices decomposing step, and the decomposed black matrices diffusing step.

<132>