TWI335462B - Method of repairing bright pixel defect of display device - Google Patents

Description

1335462 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a repair of a bright pixel defect on a display device. In particular, it relates to a method for repairing a bright pixel on a display device, which can selectively use a laser having a wavelength band of a high absorption spectrum with respect to a color filter having a bright pixel defect, whereby the color is used. Bright pixel defects in the filter. [Prior Art] In recent years, liquid crystal displays have become the focus of next generation high-tech displays because of low power consumption, high portability technology, 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 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 face to face and on the substrate. Into the liquid crystal layer 520. The pixels are driven through the address lines by switching the connections that have been connected to the thousands of pixels to select the pixels to be applied to the corresponding pixels. Here, the color filter substrate 5 3 〇 glazing substrate 531 and the red/green/blue (rgb) color filter 5 3 2 ′ are formed in the black matrix 533 between the filters 532 for sharing. An indium (ITO) film 535 of an electrode, and an alignment film 536. A partial plate 5 3 7 is attached to the top of the glass. Method of trapping the repair of the secret device to each of the color and cross-column between the injection of TFT heating, glass, color, tin oxide, a 1335462

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-described thin film transistor array substrate process is a process of repeatedly performing deposition, photolithography etching, and etching on a glass substrate to form a gate line, a material line, a thin film transistor, and a pixel electrode. The above-described color filter substrate process is a process for fabricating RGB color filters which 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 a certain gap can be maintained between the color filter substrate of the thin film transistor array substrate, and liquid crystal is injected into the gap. To form a liquid crystal layer. Alternatively, in recent years, a one-drop filling (0DF) process has been used to uniformly apply a liquid crystal film transistor array substrate, and then the thin film transistor array substrate and the color light-emitting substrate are connected to each other. Start. When such a liquid crystal display is inspected, a measurement circle 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, 丨ine defects, and display nonuniformity. Point defects are usually caused by poor tft, poor image electrodes, or poor color filter connections. 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 due to the liquid crystal cell thickness of the board. The color of the board is required to be applied to the board and the board is sampled. The average line is not 6 1335462

The average alignment of the liquid crystals is uneven, and the TFTs are distributed at a specific position or too high. Point defects and line defects are generally caused by poor wiring. When the open circuit is found, the open circuit is connected only when a short circuit is found. The short circuit connection is only separated from each other. In addition to the above defects, dust, organic matter, and gold are adsorbed onto the liquid crystal panel during the manufacture of the liquid crystal panel. When adsorbed to an area near the color filter, the pixels of the corresponding slice emit brighter light than the rest of the pixels, due to the light-leakage phenomenon. It is currently being shot to fix this bright pixel defect. The patent application No. 2006-7229 discloses an alignment film which damages the alignment film to weaken the light of the liquid crystal alignment property, and the technical technique of eliminating the light leakage phenomenon is that the alignment property of the liquid crystal cannot be completely excluded. A lot of time can be done to complete this process. In order to solve the above problem, Korean Patent Application No. 1 __ proposes a femtosecond laser to make a defect image like a femt〇second laser, which can be blackened by pixels; It is used to oscillate the cost of producing femtosecond lasers. SUMMARY OF THE INVENTION Line time constant. In the conventional technology, the impurities are connected to each other, and these impurities are also used as color filters. This is called leak. R&D uses lightning to illuminate the laser and thus reduce it. However, this, and the need to consume the blackening of 2006-86569 effectively makes the lack of equipment quite high. 1 1335462 Therefore, the purpose of the present invention is to meet the above problems, so the object of the present invention is k is a method for repairing a bright pixel defect placed on a display of sylvestris. 'A laser with a wavelength band having two absorption spectra relative to an individual image (1) pixel can be used to effectively repair 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 that is spliced by a display with a polarizing plate attached thereto, the method comprising: m color pixel defective color light film is a red light (r) region, irradiating a laser with a wavelength between 400 and 55 〇nm. When a color filter having a bright pixel defect is a green (G) region, the illumination is at a wavelength between 400 and 480 nm or A laser between 600 and 75 〇 nm, and/or a laser having a wavelength between 520 and 750 nm when the color filter having a bright pixel defect is a blue (B) region. Preferably, the pulse period of the laser is 10 ns or less, and the laser has a repetition frequency between about 1 Hz and 1 kHz. Preferably, the method further comprises adjusting the intensity of the laser.

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 10 mW or less. Preferably, the laser is irradiated by a scanning type laser irradiation method or a block shot type laser irradiation method or a multi block shot type laser irradiation method Irradiate onto the color filter. In this case, it is preferably 8 1335462

To irradiate the laser to the color filter. Preferably, the laser is created using at least one laser selected from the group consisting of: Ytterbium laser, Titanium-sapphire mine: YLF laser, Nd: glass laser, Nd: vanadate (YV04) Ray YAG laser, weave laser and dye laser. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention for repairing a bright image on a display device according to the present invention is to illuminate a pixel having a bright pixel defect (a color filter black matrix). The defective pixel is blackened. When the laser is irradiated on an organic film layer (for example, a color filter J breaks the coupling between the organic substances constituting the film layer, as a result, it is peeled off and emits free radicals, clusters, electrons, and the like. The organic film layer is blackened by a neutral atom, a molecule, and a positive ion and a negative ion. Ablation is a process in which an organic substance is decomposed into a component and an ion because of the consumption of an organic substance. However, such dissociation, It is necessary to absorb higher energy than the energy level of the organic material. The illuminating energy level of the blackened pixel is reduced, so that 'black is not transparent, but light absorbed from the display light source can be absorbed. Repair defective pixels to detect The defective pixel is a dark pixel. Therefore, when a blackened pixel is irradiated with a low transmittance, a light film of Nd: Nd: a defect, and 4), the organic film is irradiated. Layers and photons, slurries, so that the sub-dissociation, in order to achieve the deuterated pixels, can be bright pixel variable wavelength Ray 9 1335462 shot (that is, a has a wavelength of absorbance): Refer to Figure 2 to select Long-defective color 泸*^ I case to 1 - has - bright pixels, the first piece of 疋 红 红 红 红 红 红 11 11 11 11 11 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有 有smaller. When using a laser with a wavelength above | ς λ, the wavelength of the laser is used at 55〇nm, and when the red light region is shot, the penetration of the lure of Kuching is interposed. Therefore, a large layer, including the overlay, is required: It will seriously damage several kinds of film coverings, IT layers and alignment layers under the color light-emitting sheet. If under the color filter

When one is destroyed, the liquid crystal will run over the damaged area, resulting in bubbles that 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. As a result, the laser cannot reach the money: & A > u . c / color). A laser with a wavelength greater than 750 nm can penetrate a color aerator. The result is that the laser cannot react on a color light-emitting sheet.当 'When a color filter with a bright pixel defect is a red light (the field is preferably irradiated with a laser having a wavelength between 270 and 550 nm onto a color light-emitting sheet, thereby effectively The color filter is blackened so that the bright pixel defects of the color filter can be repaired without damaging the film under the color filter. Therefore, when it is desired to repair such bright pixel defects, it is necessary to illuminate the wavelength. A laser having a low color filter transmittance. For a red (R) region, it is preferred to irradiate a laser having a wavelength between 270 and 550 nm as described above to a color filter. The region is preferably a laser having a wavelength between 270 and 480 nm or between 600 and 700 nm. For the blue (B) region, the wavelength is between 270 and 390 nm or 520. Laser between ~750 nm. 10 1335462 Fig. 3 shows a light transmittance of a polarizing plate according to the present invention. As shown in Fig. 1, the polarizing plate is attached to the top of the color filter. The laser light used to repair bright pixel defects must penetrate the polarizer. Therefore, it is necessary to refer to the light transmittance of Figure 3.

It can be seen from Fig. 3 that the polarizing plate has a light transmittance of about 50% in the visible light range, and is opaque in the ultraviolet light range, and its light transmittance is also close to the near-infrared light field. It will increase. For this reason, when it is desired to blacken any of the RGB calenders on the panel to which the polarizing plate is attached, it is preferable to use laser light having a wavelength of 400 nm or more.

Therefore, it is necessary to exclude the wavelength obtained in Fig. 2 below 400 nm in order to effectively blacken the display to which the polarizing plate is attached. [Conclusion] When the color filter having a bright pixel defect is a red light ( In the R) region, the color filter can be illuminated using a laser having a wavelength between 400 and 500 nm. When a color filter having a bright pixel defect is a green (G) region, a laser having a wavelength between 400 and 480 nm or between 600 and 750 nm is irradiated to illuminate the color filter. When a color filter having a bright pixel defect is a blue light (B) region, a laser having a wavelength between 520 and 750 nm can be used to illuminate the color filter. Figures 4A to 4C show various methods of illuminating a laser onto a pixel having a bright pixel defect. Specifically, Fig. 4A shows a scanning laser irradiation method, Fig. 4B shows a barrier irradiation type laser irradiation method, and Fig. 4C 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. 4A) and a laser corresponding to a portion of the pixel region having a bright pixel defect 1] 1335462, so that the laser beam is irradiated On the 'full pixel area. The barrier laser irradiation method is to irradiate 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 is to irradiate the laser according to the barrier-illuminated laser irradiation method while continuing 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 Fig. 5', it is preferable to perform laser irradiation several times to blacken the color filter. In detail, 'When the first laser is irradiated (S1)', the z•axis movement scan is used to find the depth of focus (d〇f) corresponding to the area of the color filter 10〇/〇 thickness. Then, the color filter is blackened by moving the scan with the χγ_axis. 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 (d〇f) of the region of the filter 20% thick, followed by a second laser scan (S2) with an XY-axis shift scan. By repeating this step 2 to 4 times, the color filter can be satisfactorily blackened to the desired degree of blackening. Fig. 6 shows a method for blackening a color filter while moving the depth of focus according to the above method. As shown on the sixth lap, first illuminate the color filter (S 1 0) with a laser to make approximately 12 1335462

The 10% color filter is blackened (S20), and then the degree of confirmation (S3 0) is determined to determine whether or not the color filter has been (S40). When it is confirmed that the color filter has been blackened to the desired processing (S50). Conversely, if it is determined that the color is not sufficient, then move the focus distance again (86 (^, laser onto the color filter, so that it can be moved further from the Z-axis to scan between the scanning lens and the scanning lens). Incident light diameter in the range of $μm or less·5J* _ (DOP) [Math. 1] DOF = λ!2{ΝΑ)2 [Math 2] NA = nsin 0 Blackening of the color filter After the extent of the degree of desire, the blackening process of the filter is finished, and then the blackening is again irradiated. The distance of the point, and 2 the depth of focus is calculated.

[Math 3] //# = 1/2_ [Math 4] //# = efl/φ Mathematical formula 5 can be derived from Mathematical Formula 3 and Mathematical Formula [Mathematical Formula 5] ΝΑ = φ/2{ βΑ) In the above mathematical formula, ΝΑ represents a child's aperature, λ represents the wavelength of the laser, and e//# t indicates that the larger the diameter of the incident beam, the lighter the charged wave. It can also be confirmed that the focal length eA of the lens is shorter - the diameter value (the focal length of the numerical effect. The shorter the length, the DOF, the larger the aperture value (NA) will be 13 1335462, and therefore, the shallower the DOF will be.

The degree of blackening is preferably less than 90% of the maximum value, preferably 20% to 40 Å/〇 of the thickness of the color filter to prevent light leakage in the viewing angle range of the liquid crystal panel. When the range of 2% or less of the thickness of the color reticle is blackened, (100%) light leakage can be completely prevented. Conversely, when more than 90% of the color filters are blackened, the layers stacked under the color filters 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. 7, there is shown a display having no cover layer ("ver verc" Uyer) for reducing manufacturing cost and simplifying process β while a cover layer has absorbance as shown by the eighth circle. It can be seen from Fig. 8 that there is almost no light transmission below the ultraviolet (UV) range, and about 80% of the light is absorbed in the U V range, and only about 20% of the light is permeable.

Therefore, the repair of a display without a cover layer will be different from that of a display with a cover layer. This is because the energy generated by the laser used to repair the defect of the bright pixel is absorbed by the cover layer. Therefore, when repairing the bright pixel defect on the display without the cover layer, the color filter is penetrated. The energy reaches the liquid crystal layer, and as a result, the liquid crystal layer is damaged. For this reason, a low-energy laser can be used to prevent the liquid crystal layer from being damaged, but at this time, no reaction occurs. 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 using a laser pulse for 14 1335462 for 50 ns or less, and repeating the frequency between 1 Hz and 100 Hz, the power of 10 mW or less can be satisfactorily repaired without Bright pixel defects on the display of the overlay layer. Figure 9 shows the shape of the 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 laser being illuminated. 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 pixels 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 laser having a high absorption spectrum (relative to a color filter) of a wavelength band can be selectively used to effectively repair a bright pixel defect of a color filter. 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. Although the spirit of the present invention has been described in detail with reference to the specific embodiments, the embodiments of the present invention are only intended to be illustrative of the present invention. 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. [FIG. 1 shows a partial schematic diagram of a liquid crystal panel containing impurities; A light transmittance diagram of a color filter according to the wavelength of the color filter is shown; Φ FIG. 3 shows a light transmittance diagram of the polarizing plate according to the wavelength of a polarizing plate; FIG. 4A-4C A detailed description of various laser irradiation methods; FIG. 5 shows a method of adjusting the focal length and simultaneously irradiating the laser; FIG. 6 is a flow chart of the blackening process; and FIG. 7 is a cross-sectional view of the liquid crystal panel without the cover layer; Figure 8 is a light absorption diagram of a cover layer; Figure 9 is a schematic view of the shape of a laser beam in accordance with the present invention.

[Main component symbol description] 300 Rectangular flat top 301 Round flat top 500 Liquid crystal panel 5 10 Thin film transistor array substrate 520 Liquid crystal layer 530 Color filter - Light substrate 53 1 Glass substrate 532 Color base sheet 533 Black matrix 535 Indium tin Oxide (ITO) film 536 alignment film 537 polarizing plate 16

Claims (1)

1335462 _ Year Month Day Amendment 99. 3. 2 3 X. Patent Application Scope 1. A method for repairing bright pixel defects of a display with a polarizing plate attached, comprising the following steps: When a color filter with a bright pixel defect When the light sheet is a red (R) region, a laser having a wavelength between 400 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 400 and 480 nm or between 600 and 750 nm; and/or having a bright pixel defect The color filter is a laser that emits a wavelength between 5 2 0 and 75 nm when in a blue (B) region; wherein the laser has a pulse period of 50 when the display has no overcoat layer Ns or less; and wherein the laser has a repetition rate between about 1 Hz and 100 Hz. 2. The method described in claim 1 further includes the following steps: Adjusting the intensity of the laser. 3. The method of claim 1, wherein the laser has a flat top waveform. 4. The method described in claim 1 further includes the following steps: [S] 17 1335462 Adjusting the intensity and focus of the laser so that the thickness of the color filter is 20% to 90% The shooting is blackened. 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 1335462 Dire shot and dye laser. 19 4 4Γ335462 VII. Designated representative map: (1) 'The representative representative figure of this case is: (2). (B), the representative symbol of the representative figure is a simple description: no component symbol 8. If there is a chemical formula in this case, please reveal the chemical formula that best shows the characteristics of the invention: 4