TWI335451B - Method of repairing bright pixel defect of display device - Google Patents

Description

1335451

Nine, invention description: [Technical field to which the moon belongs] Related. detailed! The method of repairing the bright pixel defects on the display device is in the form of a system and a bright pixel on the repair display device, which can be used with respect to a color light film with bright pixel defects. A laser that absorbs the wavelength band of the spectrum, whereby the bright pixel defects of the color filter. [Prior Art] In recent years, liquid crystal displays have become the focus of the next generation of high-tech displays because of low power consumption, high portability and high added value. The active array type liquid crystal display includes a switching element for switching the potential applied to a pixel, which is highly concerned because of the advantages that the resolution can be used for the action sheet. Referring to FIG. 1 , a liquid crystal panel 5 〇 0 is constructed in which a color light substrate 530 (as an upper substrate) and a thin film transistor (TFT) array 510 (as a lower substrate) are bonded to each other in a substrate. Liquid crystal layer 520. The liquid crystal panel 5 驱动 is driven by switching the connections that have been connected to thousands of pixels, and the pixels are selected via the address lines to be applied to the corresponding pixels. Here, the color filter substrate 53 〇 the glass substrate 531, the red/green/blue (RGB) color filter 532, the black matrix 533 formed between the filters 532, and the indium compound for the common electrode ( ITO) film 535, and alignment film 536. A polarizing plate 537 is attached to the top of the glass. The method of trapping is to repair the secret device to each high and color filter column. Note that the TFT is charged. The color of the tin oxide is 1335451.

A thin film transistor array substrate process, a color filter base process, and a liquid crystal cell process are performed to fabricate the liquid crystal panel. The above-mentioned thin film transistor array substrate process is a process of repeatedly performing product, photolithography etching, and forming a gate line, a material line, a thin film transistor and a pixel electrode on a glass substrate. The above-described color filter substrate process is a process for manufacturing RGB color filters. The color filters are arranged on a glass having a black matrix in a predetermined order to perform color and form indium of a common electrode. Tin oxide (ITO) film. The liquid crystal cell process described above enables a process for bonding the thin film transistor array plate and the color filter substrate, so that the thin film transistor array substrate can be colored, a certain gap can be maintained between the light substrate, and liquid crystal is injected in the gap. 'To form a liquid crystal layer. Or, in recent years, a one-drop filling (〇DF) process has been used to uniformly apply a liquid crystal film on a transistor array substrate, and then the thin film transistor array substrate and the color filter substrate are connected to each other. _ from. When such a liquid crystal display is inspected, a test pattern is displayed on the liquid crystal panel to detect the presence or absence of defective pixels. When a defective element is found, a process for repairing defective pixels is implemented. Liquid crystal defects may include spot defects, Hne defects, and display nonuniformity. Point defects are usually caused by poor TFTs, poor image electrodes, or poor color filter wiring. Line defects are caused by open circuits, short circuits between lines, TFT breakdown due to static electricity, or poor connection to the drive circuit. The display unevenness is usually caused by the thickness of the liquid crystal cell. The sinking color is on the basis of the substrate and the image is taken into the board. The average line is not 6 1335451

Uniformity, uneven liquid crystal alignment, TFT distribution at a specific location or wiring is too direction. Defects and line defects are generally caused by poor wiring. When the system is found to be open, the open circuit is only connected to each other. When the field is found, the short circuit connection is only separated from each other. The above defects t, including dust, organic matter, metal, and the like, are adsorbed onto the liquid crystal panel during the manufacture of the liquid crystal panel. When these impurities are close to the area near the % color filter, the color filter corresponds to a brighter light than the rest of the pixels, so it is called a light-leakage phenomenon. A method of using this bright pixel defect is currently being developed. The patent application No. 2006.7229 discloses a technique for illuminating an alignment film to damage the alignment film to weaken the alignment property of the liquid crystal and to emit light due to the liquid crystal, thereby eliminating light leakage. However, the technical problem is that the alignment property of the liquid crystal cannot be completely ruled out, and it takes a lot of time to complete the treatment. In order to solve the above problem, Korean Patent Application No. 10-2006 proposes a femtosecond laser to make a defective pixel black. When femtosecond lasers are used, the defective pixels are effectively blackened; the equipment used to oscillate to generate femtosecond lasers is quite expensive. SUMMARY OF THE INVENTION Therefore, the present invention has been made in an effort to overcome the above problems. Therefore, the conventional constant connection between the hair and the hair is caused by the phenomenon of light incident on the image of the adsorbed sheet, which is required to be reduced by 8686. However, one of the objects 7 1335451 provides a method for repairing bright pixel defects on the device, which can be used with respect to individual stupidity. The wavelength of the laser 'is effectively repairing a bright pixel defect.

In accordance with the present invention, the above and other features can be accomplished by providing a method of repairing a bright pixel defect of a display device having no polarizing plate, the method comprising: when a color filter having a bright pixel defect is a red In the light (R) region, a laser having a wavelength between 27 〇 and 55 〇 nm is irradiated. When the color filter having a bright pixel defect is a green (G) region, the illumination is at a wavelength of 270 to 480 nm. Laser between 600~75〇nm, and/or when a color filter with a bright pixel defect is a blue (B) region, the illumination wavelength is between 270~390 nm or 520~750 nm The laser. Preferably, the laser has a pulse period of 100 ns or less and the laser has a repetition rate between about 1 Hz and 1 kHz. Preferably, the method further comprises adjusting the intensity of the laser. Preferably, the laser has a flat top waveform.

Preferably, the method further comprises adjusting the intensity and focus distance of the laser such that 20% to 90% of the thickness of the color filter can be blackened by the laser. Preferably, 'when the display has no overcoat layer, the pulse period of the laser is 50 ns or less, and the laser has a repetition frequency between about 1 Hz and 100 Hz, and the laser power is about i〇 mW or smaller. Preferably, the laser is irradiated onto the color filter by scanning laser irradiation. Alternatively, the laser shot 8 1335451 is preferably used by a block shot type laser irradiation method or a multi block shot type laser irradiation method. At least - a laser selected from the following to create the desired laser, Nd: N, laser, including · · u, (erblum) laser, titanium sapphire W; YLF laser, Nd: glass private Laser, Nd, Syrian salt (γν〇4) Ray YAG laser, fiber laser and dye laser. In the following, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. According to the present invention, a method for repairing bright pixel defects on a display device according to the present invention is to illuminate a brightly-supplemented element. The defective pixel (a color filter, that is, a black matrix around it) causes the defective pixel to be blackened. When the laser is irradiated on a film layer (for example, a color filter), the organic matter that constitutes the film layer is interrupted, and the organic film layer is formed. The free radical 'cluster', electrons, and photons are stripped and emitted, including an electrical device containing neutral atoms, molecules, and positive ions and negative ions, such that the organic film layer is blackened. • Peeling is the process by which an organic substance is decomposed into ions and ions because of the dissociation of organic molecules. However, in order to achieve such dissociation, it is necessary to absorb higher energy than the energy level of organic matter. The emitted light of the blackened pixel is lowered, so that the blackened pixel has no light transmission, but absorbs light generated from the display light source. Thereby, the defective pixel can be repaired so that the bright pixel of the detected defective pixel becomes a dark pixel. Therefore, Ray 9 1335451 (i.e., a wavelength having a high absorbance) having a low transmittance is irradiated on a pixel which is required to be blackened.

Refer to Figure 2 to select the wavelength. For example, when a color filter having a bright pixel defect is a red (R) region, it can be seen that the wavelength of high absorbance in the red region is 550 nm or less. When a laser with a wavelength above 550 nm is used to illuminate the red region, the penetration is high, so a large amount of energy is required. The result will seriously damage several layers under the color filter, including the overlay layer, ITO. Layer and alignment layer. If the film under the color fascia is destroyed, the liquid crystal will run over the damaged area, resulting in bubbles, which will cause more serious defects in the color filter. At the same time, a laser with a wavelength of less than 270 nm cannot penetrate the glass, and as a result, the laser cannot reach the color filter. Lasers with wavelengths greater than 750 nm can penetrate color filters' as a result of the inability of the laser to react on the color filters.

The conclusion is that when a color filter having a bright pixel defect is a red (R) region, it is preferable to irradiate a laser having a wavelength between 270 and 550 to the color filter, thereby effectively The color filter is blackened so that the bright pixel defects of the color filter can be repaired without damaging the film layer under the color filter. Accordingly, when it is desired to repair such bright pixel defects, it is necessary to irradiate a laser having a wavelength of low color filter transmittance. For the red (R) region, it is preferred to irradiate a laser having a wavelength between 270 and 550 as described above to the color filter. For the green (G) region, preferably the wavelength is 270 to 480. A laser between 600~700 nm is applied to the color filter. For the blue (B) region, a laser with a wavelength between 27 0-3 90 nm or 520 to 7 50 nm is illuminated. Figures 3A to 3C show various methods of illuminating a laser to a pixel with bright pixel defects ί S1 10 1335451. Specifically, Fig. 3A shows a scanning laser irradiation method, Fig. 3B shows a barrier irradiation type laser irradiation method, and Fig. 3C shows a multi-barrier irradiation type laser irradiation method.

Here, the scanning laser irradiation method is to scan a beam shape (see "S" in FIG. 3A) and a laser corresponding to a portion of a pixel region having a bright pixel defect so that the laser can be irradiated over the entire pixel. On the area. The barrier laser irradiation method immediately irradiates a laser beam corresponding to the entire area of a pixel having a bright pixel defect to the entire pixel area once. The multi-blocking laser irradiation method combines both a scanning laser irradiation method and a barrier irradiation laser irradiation method. That is, the multi-blocking laser irradiation method irradiates the laser according to the barrier-illuminated laser irradiation method, and continues to irradiate the laser according to the scanning laser irradiation method. While any of the above illumination methods can be used, it is preferred to irradiate the laser onto a portion of each of the black matrices surrounding the color filter and on the color filter. Referring to Figure 4, it is preferred to use a laser several times to color the color filter black.

Chemical. In detail, when the laser is irradiated for the first time (S1), the Z-axis movement scan is used to find the depth of focus (DOF) corresponding to the 10% thickness of the color filter, and then The XY-axis moves the scan to black out the color filter. When the degree of blackening of the color filter has been confirmed by a charge coupled device (CCD) camera, if it is determined that the degree of blackening of the color filter is not sufficient, the Z-axis is scanned for scanning, and the corresponding color is found again. The depth of focus (D0F) of the 20% thick region of the filter is then scanned for the second laser scan (S 2) with the XY-axis shift sweep 1335451. By repeating this step 2 to 4 times, the color filter can be satisfactorily blackened to the desired degree of blackening. Figure 5 is a flow chart showing a method for blackening a color filter while moving the depth of focus in accordance with the above method.

As shown in Fig. 5, about 10% of the color filters are blackened by laser irradiation of the color filter (S 10) (S20), and then the degree of blackening of the color filters is confirmed (S 3 0) to determine whether the color filter has been blackened to the desired level (S4 0). When it is confirmed that the color filter has been blackened to the desired degree, the processing is ended (S50). On the other hand, if it is determined that the degree of blackening of the color filter is not sufficient, the focal length is moved again (S60), and then the laser is irradiated again onto the color filter to be further blackened. The depth of focus (DOP) can be calculated by moving the focus distance between the scanning and scanning lenses from the Z-axis and the incident light diameter in the range of 2 microns or less. [Math 1]

DOF = λ/2{ΝΑ)2 [Math 2] NA = nsin Θ [Math 3] f/# = l/2(NA) [Math 4] //# = efl/φ Math 5 can be Both Mathematical Formula 3 and Mathematical Formula 4 are derived. [Math 5] 12 1335451 . ΝΑ = φ ΐ 2, φ • In the above mathematical expression, να represents a valid aperture value (numerical aPerature), which also represents the wavelength of the laser, and e// represents an effective focal length. It can be confirmed that the larger the diameter of the incident beam, the shorter the laser wavelength and the shallower. It can also be confirmed that the shorter the focal length e// of the lens, the larger the aperture value (na), and therefore, the shallower the DOF will be. The degree of blackening is preferably less than 90% of the maximum value, preferably the thickness of the color filter. Between 20% and 40% to prevent light leakage in the viewing angle range of the LCD panel. When the range of 20% or less of the thickness of the color filter is blackened, (100%) light leakage can be completely prevented. Conversely, when 9〇0/. When the thickness of the above color stencil is blackened, the film layer stacked under the color filter may be damaged. In addition, laser energy plays a very important role in causing an organic film layer to be blackened to an appropriate thickness. In other words, the degree of blackening can be adjusted depending on the energy of the output laser. Referring to Fig. 6', a display without a cover layer is shown to reduce the manufacturing cost and simplify the process β ^ while a cover layer has absorbance as shown in Fig. 7. It can be seen from the seventh , that there is almost no light transmission below the ultraviolet (υν) range, and about 80% of the light is absorbed in the uv range, and only about 2% of the light is permeable. - Therefore, the repair of the display without the overlay will be different from the repair of the overlay with the overlay. This is because the energy generated by the laser used to repair the missing pixels is absorbed by the cover layer. Therefore, color is penetrated when repairing bright pixel defects on a display without a cover layer. [ 13 1335451 泸 The energy of the light sheet reaches the liquid crystal layer, resulting in damage to the liquid crystal layer. For this reason, a low-energy laser can be used to avoid damage to the liquid crystal layer, but no reaction occurs at this time.

Therefore, in consideration of the above problems, it is necessary to satisfy the conditions of low energy laser and short energy application time. The experimental results show that when a laser pulse is used for 50 ns or less, and the repetition frequency is between 1 Hz and 100 Hz, and the power is 10 mW or less, the display without the cover layer can be satisfactorily repaired. Bright pixel defects on. Figure 8 shows the shape of a laser beam in accordance with the present invention. The laser emitted from the laser oscillator is a Gaussian laser beam whose energy is concentrated in the central region. When the laser beam passes through a beam shaper or a beam homogenizer, the intensity of the laser beam within a particular range is normalized, with the result that the laser beam is converted into a flat top shape of an enlarged size. At this time, the laser irradiation area also changes as the shape of the beam changes. This flat top shape can also become a rectangular flat top 300 or a round flat top 3 0 1 . A beam shaper or beam homogenizer can also be used to vary the size and intensity of the illuminated laser. The smaller the area of the laser that is illuminated, the longer it takes to completely blacken the pixel. The size of the laser beam can be uniformly converted to increase the speed of blackening, whereby the present invention can be applied to a production line to mass-produce a product. In the organic film layer constituting the liquid crystal panel, the RGB pixel can be blackened by Z-axis moving scanning so as to be appropriately converted into a laser intensity having a rectangular flat top 300 or a circular flat top 301. In accordance with the present invention, in addition to the above description, a wave having a high absorption spectrum (relative to a color filter) with a long band of waves 14 1335451 can be selectively used to effectively repair bright pixels of a color filter. defect. In particular, when a polarizing plate is attached to the display device, the transmittance of the polarizing plate is considered, and the color filter can be effectively blackened depending on the wavelength thereof.

The present invention has been described in detail with reference to the particular embodiments thereof. It is to be understood that those skilled in the art can change or modify the embodiment without departing from the scope and spirit of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial schematic view showing a liquid crystal panel containing impurities; FIG. 2 is a view showing a light transmittance of a color filter according to the wavelength of the color filter; FIGS. 3A to 3C A detailed description of various laser irradiation methods; FIG. 4 shows a method of adjusting the focal length and simultaneously irradiating the laser; FIG. 5 is a flow chart of the blackening process; and FIG. 6 is a cross-sectional view of the liquid crystal panel without the cover layer; Fig. 7 is a light absorption diagram of a cover layer; Fig. 8 is a diagram showing the shape of a laser beam according to the present invention. [Main component symbol description] 300 Rectangular flat top 301 Round flat top 500 Liquid crystal panel 510 Thin film transistor array substrate 520 Liquid crystal layer 530 Color filter substrate 15 1335451 53 1 Glass substrate 532 Color filter 533 Black matrix 535 Indium tin Oxide (ITO) film 536 alignment film 537 polarizing plate

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Claims (1)

1335451 曰 曰 revised version "· 3. 2 3 10, the scope of application for patents: 1. A method for repairing bright pixel defects of a display without a polarizing plate, comprising the following steps: When the light sheet is a red (R) region, a laser having a wavelength between 270 mm and 550 nm is irradiated; When a color filter having a bright pixel defect is a green (G) region, irradiating a laser having a wavelength between 270 and 480 nm or between 600 and 750 nm; and/or when having a bright pixel defect When the color filter is a blue (B) region, a laser having a wavelength between 270 and 3 90 nm or between 520 and 750 nm is irradiated; wherein when the display has no overcoat layer, the laser pulse The period is 50 ns or less; and the laser has a repetition frequency between about 1 Hz and 100 Hz. 2. The method described in the first paragraph of the patent application includes the following Adjust the intensity of the laser. 3. The method of claim 1, wherein the laser has a flat top waveform. 4. The method of claim 1, further comprising the steps of: r r- -I *_ i 17 1335451 adjusting the intensity and focus distance of the laser such that the thickness of the color filter is 20% to 90 % can be blackened by the laser. 5. The method of claim 1, wherein the laser power is about 10 mW or less. 6. The method of claim 1, wherein the laser is irradiated onto the color filter by a scanning laser irradiation method. 7. The method of claim 1, wherein the method comprises a block shot type laser irradiation method or a multi block shot type laser (a multi block shot type laser) The laser is irradiated onto the color filter. 8. The method of claim 6 or claim 7, wherein the laser is incident on the color filter and on a black matrix around the color filter. 9. The method of claim 1, wherein the laser is produced by at least one laser selected from the group consisting of: Ytterbium laser, Chin-sapphire laser, Nd: YLF Laser, Nd: glass laser, Nd: vanadate (YV04) laser, Nd: YAG laser, fiber 18 1335451 dimensional laser and dye laser. 19 1335451 VII. Designated representative figure: Picture (2). Brief description of the symbol: (1) The representative representative figure in this case is (2), the component generation of the representative figure, no component symbol Please reveal the best display. 8. If there is a chemical formula in this case, the chemical formula: 4