WO2005096003A1 - Procede de test de defaut d'un panneau afficheur - Google Patents

Procede de test de defaut d'un panneau afficheur Download PDF

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Publication number
WO2005096003A1
WO2005096003A1 PCT/CN2004/000285 CN2004000285W WO2005096003A1 WO 2005096003 A1 WO2005096003 A1 WO 2005096003A1 CN 2004000285 W CN2004000285 W CN 2004000285W WO 2005096003 A1 WO2005096003 A1 WO 2005096003A1
Authority
WO
WIPO (PCT)
Prior art keywords
display panel
inspecting
liquid crystal
panel according
crystal display
Prior art date
Application number
PCT/CN2004/000285
Other languages
English (en)
Chinese (zh)
Inventor
Xindao Huang
Original Assignee
Quanta Display Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Quanta Display Inc. filed Critical Quanta Display Inc.
Priority to PCT/CN2004/000285 priority Critical patent/WO2005096003A1/fr
Publication of WO2005096003A1 publication Critical patent/WO2005096003A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing

Definitions

  • the present invention relates to a method for inspecting defects in a display panel, and in particular, to a method for inspecting defects in a liquid crystal display panel using a conductive adhesive having two different curing components. Background technique
  • a panel generally a glass panel
  • a driving element or the like In the field of thin film transistor liquid crystal displays (TFT-LCD), a panel (generally a glass panel) of a liquid crystal display is bonded to a driving element or the like.
  • Anisotropic Conductive Film (ACF) and anisotropic conductivity are generally used
  • An adhesive Adhesive, ACA
  • TFT-LCD glass panels Due to the electrical conductivity of this anisotropic conductive material, it is widely used for bonding TFT-LCD glass panels to drive circuit elements, such as Tape Automated Bonding (TAB), Chip on Film, COF), Chip on Glass (COG), Outer Lead Bonding (OLB) bonding technology.
  • TAB Tape Automated Bonding
  • COF Chip on Film
  • COG Chip on Glass
  • OLB Outer Lead Bonding
  • thermosetting polymers are mainly selected as the base to achieve high adhesion.
  • the use of polyester, epoxy resin, silicone resin, urethane resin, etc. can be subjected to condensation or cross-linking reaction after high temperature, pressure or catalysis, resulting in a three-dimensional network structure, corrosion, moisture attack, etc. Good resistance and suitable mechanical strength.
  • due to its three-dimensional network cross-linked structure it hardly reacts with any solvents or reagents. Therefore, it is not easy to perform a re-processing process in the joint application project of the TFT-LCD glass panel and the driving element.
  • the driving element is the bare wafer directly bonded to the glass substrate
  • the bare wafer is often damaged and left on the glass substrate during reprocessing, or the anisotropic conductive material is left on the glass substrate and cannot be effectively removed. , Resulting in scrapped glass panels Missed. The larger the size of the glass panel, the greater the loss due to failed reprocessing.
  • thermosetting conventional anisotropic conductive film The process of bonding and inspecting a TFT-LCD glass panel with a driving element using a thermosetting conventional anisotropic conductive film is shown in Figure 1.
  • an anisotropic conductive film is added to adhere the electrodes of the liquid crystal display panel and the driving circuit element (step 100).
  • a heating step step 101
  • An ultraviolet light sealing agent is coated on the liquid crystal display panel (step 102) and exposed to ultraviolet light (step 103) to cure the ultraviolet light sealing agent.
  • perform an inspection step (step 104) to inspect the liquid crystal display panel and the driving circuit components for defects. If there are no missing items, proceed directly to the next step (step 106). However, if any defects are found on the panel, the panel is discarded directly (step 105).
  • thermoplastic polymer for the purpose of repairability, another thermoplastic polymer is selected as the base agent to achieve the purpose of temporary bonding.
  • polyethylene, polyvinyl chloride, polymethyl methacrylate, polyimide, and other resins exhibit plasticity at high temperatures. Therefore: 3 ⁇ 4
  • TFT-LCD glass panel and driving element when the inspection process finds defects due to element alignment or poor bonding, driving element defects, etc., it can use the high temperature for re-processing. Eliminate driving elements and anisotropic conductive materials to avoid scrapping expensive glass panels.
  • thermoplastic resins may affect the reliability of the product in high-temperature environments encountered in subsequent use.
  • thermosetting polymers and thermoplastic polymers in different proportions as the above-mentioned discretionary adhesives.
  • thermoplastic and thermosetting polymer-based adhesives did not achieve the required reliability and reworkability as expected in actual use.
  • the main purpose of the present invention is to provide two fixing methods, so that it is easier to repair or reprocess after the f inspection step. Way to proceed.
  • These two types of fixing methods have different curing methods, one of which is thermal curing and the other is exposure to H.
  • Another object of the present invention is to provide a new conductive adhesive, which can fix objects in different curing modes.
  • Yet another object of the present invention is to improve the yield of products through a convenient repair or reprocessing process.
  • the present invention provides a method for inspecting a display panel, comprising the steps of temporarily fixing the display panel and a driving circuit element in a pet, inspecting the defects of the display panel, and permanently fixing the display panel and Drive circuit elements. After a defect is found in the inspection step, a step of repairing the display panel is performed.
  • the display panel in the invention can be a liquid crystal display panel or a plasma display panel.
  • the temporary fixing can be achieved by heating a conductive adhesive located between the display panel and the wafer, wherein the conductive adhesive includes a thermosetting resin, a photocurable polymer, a photoinitiator, and conductive particles. Permanent fixation can be achieved by a conductive adhesive between the illuminated display panel and the wafer.
  • FIG. 1 is a flowchart of combining a liquid crystal display with a driving circuit element in a conventional manner
  • FIG. 2 is a method according to the present invention using two different fixed steps Flowchart of simple repair or rework of the display panel;
  • FIG. 3 is a flowchart of a method for fixing a liquid crystal display panel and a driving circuit element using a conductive adhesive according to the method of the present invention. detailed description
  • the invention provides a method for inspecting a display panel, which includes the steps of temporarily fixing the display panel and a driving circuit element, inspecting defects of the display panel, and permanently fixing the display panel and the driving circuit element. After a defect is found in the inspection step, a step of repairing the display panel is performed.
  • the display panel may be a liquid crystal display panel or a plasma display panel in the present invention.
  • Temporary fixing can be achieved by heating a conductive adhesive located between the display panel and the wafer.
  • the conductive adhesive includes a thermosetting resin, a photocurable polymer, a photoinitiator, and conductive particles. Permanent fixing can be achieved by irradiating a conductive adhesive located between the display panel and the wafer.
  • the weight ratio of the above-mentioned thermosetting resin to photo-curable polymer is 50:50 to 90:10, and the above-mentioned photoinitiator accounts for 0.1 to 5% by weight of the composition.
  • the conductive particles are uniformly dispersed in the binder, and may be conductive metal particles or plastic particles with metal deposited on the surface.
  • thermosetting resin may be polyester, epoxide, silicone resin or urethane resin.
  • the photo-curable polymer may be an ultraviolet (W) curable polymer, an electron beam (EB) curable polymer, an infrared (IR) curable polymer, or a visible light (VL) curable polymer.
  • the aforementioned photo-curable polymers may be epoxy resins, bisphenol resins, unsaturated polyesters, and acrylate resins. Examples include urethane diacrylates and epoxy diacrylates.
  • the photoinitiator may be a benzoin monomethyl ether, a higher fluorenyl benzoin ether, benzophenone, etc. The type of the photoinitiator may be fixed according to the light used. Depending on the type of polymer.
  • the visible light (VL) curable polymer may be a combination of non-aromatic amines such as N, N-dimethylaminoethyl methacrylate and ketones or dimers that can absorb visible light in the 400-500 nm range.
  • non-aromatic amines such as N, N-dimethylaminoethyl methacrylate and ketones or dimers that can absorb visible light in the 400-500 nm range.
  • the thermosetting resin is used to provide the bonding strength to maintain the temporary bonding of the driving element and the glass panel for subsequent inspection procedures. Therefore, its weight should account for the 50 to 90% by weight of the total weight of the photocurable polymer. Based on the need for reworkability, photocurable polymers are preferred! ⁇
  • the total weight of the thermosetting resin and the photo-curable polymer is more than 10% by weight but not more than 50% by weight. The higher the proportion of the thermosetting resin, the stronger the adhesive strength.
  • it is confirmed in the inspection procedure that due to poor alignment of the glass panel and the driving element electrodes, or poor COG connection, defective glass panel or defective driving element it is necessary to perform heavy processing. .
  • the sealing step includes applying or coating a light-curable sealant to the display panel and the wafer, and then irradiating the light-curable sealant with light.
  • the photocurable sealant may be epoxy-based lipid, bisphenol resin, unsaturated polyester or acrylate resin.
  • One preferred method is that the photocurable sealer is selected the same as the photocurable polymer in the conductive adhesive, so that the sealing step and the permanent fixing step can be combined together or performed in the same step.
  • the ultraviolet light curable sealant may be epoxy resin, bisphenol resin, unsaturated polyester or acrylate resin.
  • the inspection program includes two procedures of an optical instrument inspection and an electrical inspection.
  • the optical instrument inspection is used to check the alignment and adhesion of the panel and components, while the electrical inspection is sent by the test control system to confirm the Whether the assembly of the fixing panel and the driving element is defective.
  • defects means any quality control tester in a liquid crystal display that cannot pass the liquid crystal display device, including the optical instruments and electrical tests described above. These defects include, for example, poor alignment or bonding between the panel and the driving element, poor electrical connection, defects in the manufacture of the panel, or defects in the manufacturing of the driving element, or any defects that cause poor quality when the liquid crystal display element is driven, etc. .
  • the panel and components are found to be misaligned or bonded to each other by optical instrument inspection, the panel and the drive components are peeled off and the panel and components are rechecked to see if they are still usable. If it is still usable, the conductive adhesive of the present invention is used again to adhere to other components.
  • a test screen is sent by the test control system, and the sent screen can detect whether the test panel and the driving element themselves are defective. If the panel or the driving element is found to be defective from the test picture, check whether the panel or the driving element can be repaired, and if it can be repaired, perform laser repair and then send it to the downstream process. If it cannot be repaired, remove it and check if other components are still available. If it is still usable, the conductive adhesive of the present invention is used again for adhesion to other components. Scrap if it cannot be repaired.
  • the conductive adhesive composition used in the method for inspecting a liquid crystal display of the present invention can be formulated into a liquid and applied through a syringe or the like, or can be prepared in a dry film state and used in the form of an adhesive tape.
  • a display panel may be provided, which may be a liquid crystal display panel or other such as a plasma display panel, and is temporarily fixed to a wafer (step 10), where the wafer is usually a driving circuit element.
  • a mixed adhesive wherein the mixed adhesive includes a thermosetting resin and a photo-curable polymer, a temporary fixing step may be performed after the thermosetting resin is heated.
  • the display panel can be directly inspected for defects (step 12). If the display panel or driver circuit element Defects found in parts can be easily repaired or reprocessed (steps
  • step 16 performs a permanent fixation step (step 16) to expose the photocurable polymer in the hybrid adhesive to light of the corresponding wavelength.
  • FIG. 3 A flowchart of another inspection method of the present invention is shown in FIG. 3.
  • a conductive adhesive is applied to the display panel or the driving circuit element.
  • the conductive adhesive may be a mixture including a thermosetting resin and a photo-curable polymer, and conductive particles. The conductive particles are uniformly distributed in the conductive adhesive.
  • a photoinitiator may be added to the conductive adhesive, and initiated when light of a corresponding wavelength is irradiated to the conductive adhesive.
  • the conductive adhesive is heated (step 22) to temporarily fix the display panel and the driving circuit components, because the thermosetting resin is cured due to the heating. You can then inspect the display panel directly for defects (step 24). If there are no defects in the display panel and the drive circuit components, the panel needs to be sealed by adding a sealant (step 28). Sealers are photocurable and can be cured by exposure. When irradiated with a corresponding wavelength, the sealant is cured. The photocurable sealant may be the same as the main component of the photocurable polymer. Therefore, the step of illuminating can be omitted or incorporated into a subsequent fixed step.
  • the conductive adhesive in the panel is irradiated with light of a corresponding wavelength to permanently fix the driving circuit element (step 30). If the composition of the sealing agent is the same as that of the photocurable polymer, the sealing step can be completed at the same time. After the panel and drive circuit components are inspected and fixed, they will be sent to the next process.
  • the main advantage of the present invention is to provide two fixing methods to make it easier to repair or reprocess after the inspection step. These two fixing methods have different curing methods, one of which is thermal curing and the other is curing by exposure.
  • the invention also provides a new conductive adhesive, which can fix the object through two different curing methods. After a defect is found, the panel in question need not be discarded in the present invention.
  • the present invention improves the qualification rate of the product through a convenient repair or reprocessing process.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

On produit une combinaison d'adhésifs conducteurs en mélangeant des types de composés de traitement. Cette combinaison d'adhésifs permet de fixer temporairement un panneau afficheur sur une puce de façon à tester ses défauts. Si on trouve un défaut, des produits à demi manufacturés peuvent être réparés ou retraités facilement. Si on ne trouve aucun défaut, le panneau afficheur peut-être fixé sur la puce de manière permanente..
PCT/CN2004/000285 2004-03-30 2004-03-30 Procede de test de defaut d'un panneau afficheur WO2005096003A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2004/000285 WO2005096003A1 (fr) 2004-03-30 2004-03-30 Procede de test de defaut d'un panneau afficheur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2004/000285 WO2005096003A1 (fr) 2004-03-30 2004-03-30 Procede de test de defaut d'un panneau afficheur

Publications (1)

Publication Number Publication Date
WO2005096003A1 true WO2005096003A1 (fr) 2005-10-13

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Application Number Title Priority Date Filing Date
PCT/CN2004/000285 WO2005096003A1 (fr) 2004-03-30 2004-03-30 Procede de test de defaut d'un panneau afficheur

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04352340A (ja) * 1991-05-29 1992-12-07 Koudo Eizou Gijutsu Kenkyusho:Kk 断線検査修正装置
US5375003A (en) * 1991-03-29 1994-12-20 Rohm Co., Ltd. Method of connecting a tab film and a liquid crystal display panel
CN1160864A (zh) * 1995-03-01 1997-10-01 松下电器产业株式会社 液晶显示板的制造方法，液晶元件的封材以及液晶显示器
US6404476B1 (en) * 1989-09-01 2002-06-11 Semiconductor Energy Laboratory Co., Ltd. Device having an improved connective structure between two electrodes
CN1473354A (zh) * 2001-09-10 2004-02-04 ������������ʽ���� 基片缺陷修补装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6404476B1 (en) * 1989-09-01 2002-06-11 Semiconductor Energy Laboratory Co., Ltd. Device having an improved connective structure between two electrodes
US5375003A (en) * 1991-03-29 1994-12-20 Rohm Co., Ltd. Method of connecting a tab film and a liquid crystal display panel
JPH04352340A (ja) * 1991-05-29 1992-12-07 Koudo Eizou Gijutsu Kenkyusho:Kk 断線検査修正装置
CN1160864A (zh) * 1995-03-01 1997-10-01 松下电器产业株式会社 液晶显示板的制造方法，液晶元件的封材以及液晶显示器
CN1473354A (zh) * 2001-09-10 2004-02-04 ������������ʽ���� 基片缺陷修补装置

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