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WO2017160025A1 - Dispositif d'alignement pour module d'affichage à cristaux liquides et verre de protection et procédé de fabrication de dispositif d'affichage à cristaux liquides utillisant un tel verre de protection - Google Patents

Dispositif d'alignement pour module d'affichage à cristaux liquides et verre de protection et procédé de fabrication de dispositif d'affichage à cristaux liquides utillisant un tel verre de protection Download PDF

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Publication number
WO2017160025A1
WO2017160025A1 PCT/KR2017/002590 KR2017002590W WO2017160025A1 WO 2017160025 A1 WO2017160025 A1 WO 2017160025A1 KR 2017002590 W KR2017002590 W KR 2017002590W WO 2017160025 A1 WO2017160025 A1 WO 2017160025A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover glass
liquid
crystal display
display module
filler
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2017/002590
Other languages
English (en)
Inventor
Heon Pil Lee
Young Sik Woo
Sang Hyun Lee
Jung Ho Yoon
Jung Dae Kim
Dae Yoel PARK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Display Co Ltd
Original Assignee
LG Display Co Ltd
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 LG Display Co Ltd filed Critical LG Display Co Ltd
Priority to CN201790000743.6U priority Critical patent/CN209343072U/zh
Publication of WO2017160025A1 publication Critical patent/WO2017160025A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
    • 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133331—Cover glasses
    • 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133354—Arrangements for aligning or assembling substrates

Definitions

  • the present disclosure relates to an alignment device for aligning a liquid-crystal display module with a cover glass, and a method of manufacturing an LCD device using the same. More particularly, the present disclosure relates to an alignment device for aligning a liquid-crystal display module with a cover glass, and a method of manufacturing an LCD device using the same, for manufacturing an LCD device capable of suppressing light leakage and improving durability.
  • a liquid-crystal display (LCD) device displays images in such a manner that a light source is disposed below a liquid-crystal layer and electric field is applied across the liquid-crystal layer to align the orientation of liquid-crystal molecules so that the light emitted from the light source is transmitted or blocked.
  • a liquid crystal display (LCD) device has a thinner thickness and a clearer image quality than a cathode ray tube (CRT) display device, and thus it is applied to a TV, a monitor, etc. Recently, an LCD device is widely used as a display device for a portable terminal such as a smart phone, a tablet PC, etc.
  • an LCD device represents images by controlling the orientation of liquid crystals, it is necessary to align the initial orientation of the liquid crystals. If the initial orientation of the liquid crystals is not aligned, the orientation of the liquid crystals cannot be controlled as desired, resulting in spots on the screen or light leakage between misaligned liquid crystals. Accordingly, researches for analyzing the cause of light leakage in an LCD device and reducing it are ongoing. In addition, since LCD devices are recently applied to a portable terminal such as a smart phone, a tablet PC, etc., the durability of the LCD devices becomes important. Accordingly, studies for improving the durability of LCD devices are underway.
  • FIG. 1A is a perspective view for illustrating light leakage and durability reduction occurring in an LCD device.
  • FIG. 1B is a cross-sectional view taken along line I - I 'of FIG. 1A for illustrating light leakage and durability reduction occurring in an LCD device.
  • an LCD device 100 includes a liquid-crystal display module 110, and a cover glass 130 that covers the liquid-crystal display module 110.
  • the liquid-crystal display module 110 is attached to the cover glass 130 using a transparent adhesive 121.
  • the liquid-crystal display module 110 includes an upper substrate 111 and a lower substrate 112.
  • the upper substrate 111 and the lower substrate 112 are attached together by a sealant 113, and liquid crystals LC are disposed between the upper substrate 111 and the lower substrate 112.
  • the liquid-crystal display module 110 receives a signal from a display printed circuit board 140 and represents an image based on the received signal.
  • the liquid-crystal display module 110 comes in contact with the display printed circuit board 140 in the pad area PA, and the display printed circuit board 140 in the pad area PA comes in contact with the lower substrate 111 of the liquid-crystal display module 110.
  • the liquid-crystal display module 110 includes a touch screen panel (TSP)
  • TSP touch screen panel
  • a touch print circuit board 150 for receiving a touch signal comes in contact with the lower substrate of the liquid-crystal display module 110 in the pad area PA.
  • the display printed circuit board 140 and the touch printed circuit board 150 has to be in contact with the lines disposed on the lower substrate 111 of the liquid-crystal display module 110.
  • the upper substrate 112 cannot be disposed above the lower substrate 111 in the pad area PA, and the lower substrate 111 is exposed alone in the pad area PA. Therefore, durability of the liquid-crystal display module 110 is weaker in the pad area PA than in the non-pad area NPA.
  • a filler 160 is disposed between the lower substrate 111 and the cover glass 130 the pad area PA.
  • the filler 160 is a rigid element for firmly attaching the cover glass 130 to the lower substrate 111, the filler 160 is not deformed easily.
  • the rigidity of the filler 160 there frequently arises the problem that the lower substrate 111 is curved during the process of attaching the cover glass 130 to the liquid-crystal display module 110, which results in light leakage in the LCD device 100.
  • the rigidity of the filler 160 is insufficient to buffer impact on the lower substrate 111, the lower substrate 111 may be easily damaged by the impact.
  • the liquid-crystal display module 110 and the cover glass 130 are attached together by a transparent adhesive 121 in a process as follows: First, a dam 122 is formed on the upper substrate 112, and then a composition for a transparent adhesive is applied on the upper substrate 112. In addition, a composition for a filler 160 is applied on the lower substrate 111 in the pad area PA. The dam 122 suppresses the composition for the transparent adhesive from overflowing when the composition is applied on the upper substrate 112, and is cured before the composition is applied.
  • the cover glass 130 is placed above and aligned with the liquid-crystal display module 110, and the cover glass 130 is pressed so that the lower surface of the cover glass 130 comes in contact with the composition for the filler. Since it is desired to make the contact surface between the composition for the filler and the cover glass 130 as large as possible, the cover glass 130 is excessively pressed, and the dam 122 is also partially compressed by the pressure.
  • the composition for the filler is cured while the cover glass 130 is pressed, to form the filler 160.
  • the filler 160 attaches the cover glass 130 and the liquid-crystal display module 110 together until the composition for the transparent adhesive is cured, and keeps the cover glass 130 aligned with the liquid-crystal display module 110.
  • the transparent adhesive 121 covers an display area where images are displayed in the non-pad area NPA. It is necessary to make sure that there is no bubble between the transparent adhesive 121 and the cover glass 130. A bubble between the transparent adhesive 121 and the cover glass 130 may deteriorate visibility. Therefore, it is essential to carry out a process of removing a bubble between the composition for transparent adhesive and the cover glass 130 prior to the composition is cured.
  • the filler 160 keeps the cover glass aligned with the liquid-crystal display module 110 during the process of removing the bubble.
  • the composition for the transparent adhesive has a weak adhesive force before it is cured. Without the filler 160, the cover glass 130 may not be aligned with the liquid-crystal display module 110 during the process of removing a bubble. Therefore, an element for keeping the cover glass 130 aligned with the liquid-crystal display module 110 during the process of removing a bubble is required, which is the filler 160.
  • the composition for the filler is cured before the composition for the transparent adhesive is cured, and the filler 160 attaches the cover glass 130 to the lower substrate 111 of the liquid-crystal display module 110, such that the cover glass 130 can be aligned with the liquid-crystal display module 110 by the filler 160.
  • the filler 160 is required to have a large elastic modulus and a small elongation. That is, the filler 160 is required to having a small elongation to keep the cover glass 130 aligned with the liquid-crystal display module 110 and maintains the distance between the cover glass 130 and the liquid-crystal display module 110.
  • the filler 160 is required to have a large elastic modulus such that the cover glass 130 and the liquid-crystal display module 110 are returned to the initial alignment if they deviate from one another. That is, the filler 160 is required to have a sufficient rigidity.
  • the cover glass 130 When the pressure applied to the cover glass 130 to remove the bubble between the cover glass 130 and the composition for the transparent adhesive is released, the cover glass 130 may be raised due to the elastic force of the compressed dam 122.
  • the filler 160 attached to the cover glass 130 and the lower substrate 111 has rigidity, it has a fixed thickness. Accordingly, when the cover glass 130 is raised, the filler 160 is also raised, that the lower substrate 111 attached to the filler 160 is also raised with the cover glass 130, as shown in FIG. 1B. As a result, the lower substrate 111 is curved in the pad area PA.
  • the orientation of some liquid crystals LC in the non-pad area NPA may be changed. That is, a part of the lower substrate 111 in the non-pad area NPA may also be curved, such that the distance between the upper substrate 112 and the lower substrate 111 in the non-pad area NPA may become ununiform. As the distance between the upper substrate 112 and the lower substrate 111 becomes ununiform in the non-pad area NPA, the orientation of some liquid crystals LC' may be changed. Particularly, the orientation of the liquid crystals LC' closer to the pad area PA is more likely to be changed. As light leakage occurs between the tilted liquid crystals LC', the brightness of the LCD device 100 become ununiform.
  • the filler 160 is a rigid element having a large elastic modulus and a small elongation, and thus it may not be suitable for absorbing an external impact and may fail to buffer the impact applied to the lower substrate 111 in the pad area PA.
  • stress is applied to the inside of the lower substrate 111 as it is curved, such that the durability of the lower substrate 111 may be reduced in the pad area PA. That is, the lower substrate 111 of the pad area PA may be easily cracked even with a small impact, thereby reducing the durability of the liquid-crystal display module 110.
  • the durability of the LCD device can be lowered.
  • light leakage frequently occurs at the periphery of the display area adjacent to the pad area of the LCD device, and the lower substrate is frequently broken in the pad area of the LCD device.
  • the inventors of the application have recognized that the lower substrate in the pad area may be curved due to the rigidity of the filler, thereby causing light leakage and reducing the durability of the LCD device. Accordingly, the inventors have developed a method of attaching a liquid-crystal display module and a cover glass until a composition for a transparent adhesive is cured using a soft filler. The inventors of the application also have recognized that the soft filler may fail to keep the liquid-crystal display module aligned with the cover glass, and the thickness between the cover glass and the liquid-crystal display module may be ununiform. In view of the above, the inventors have devised an alignment device for aligning a liquid-crystal display module with a cover glass, which can overcome the disadvantage of a soft filler used to attach the liquid-crystal display module to the cover glass.
  • an object of the present disclosure is to provide an alignment device for a liquid-crystal display module and a cover glass, that is capable of suppressing a lower substrate from being curved possibly occurring during a process of attaching a cover glass to a liquid-crystal display module by employing a soft filler, thereby reducing light leakage while improving the durability of an LCD device by absorbing impact possibly exerted on the lower substrate.
  • a method of manufacturing an LCD device using the same is also provided.
  • An object of the present disclosure is to provide an alignment device for a liquid-crystal display module and a cover glass, that is capable of solving problems caused by employing the soft filler in that the alignment between the cover glass and the liquid-crystal display module is distorted, and that the thickness of the composition for a transparent adhesive between the liquid-crystal display module and the cover glass become ununiform, thereby improving the productivity and durability of an LCD device.
  • a method of manufacturing an LCD device using the same is also provided.
  • an alignment device for a liquid-crystal display module and a cover glass includes a supporting unit, a camera unit and a pressing unit.
  • the supporting unit supports the liquid-crystal display module and is movable.
  • the camera unit captures an image of the cover glass to inspect the alignment between the cover glass and the liquid-crystal display module attached together by a filler.
  • the pressing unit presses a specific portion of the cover glass corresponding to a periphery of the upper substrate of the liquid-crystal display module.
  • a method of manufacturing a liquid-crystal display (LCD) device includes: applying a composition for a filler on a lower substrate of a liquid-crystal display module; perform first curing to cure the composition for a filler; applying a composition for a transparent adhesive along a periphery of an upper substrate of the liquid-crystal display module opposed to the lower substrate; forming a dam by curing the composition for the transparent adhesive on the periphery of the upper substrate; applying the composition for the transparent adhesive such that it covers the upper surface of the upper substrate on an inner side of the dam; disposing a cover glass so that it cover the liquid-crystal display module; forming a filler attached to the cover glass by performing second curing to cure the composition for a filler cured by the first curing; removing a bubble between the upper substrate and the cover glass so that the composition for a transparent adhesive fills between the upper substrate and the cover glass; aligning the cover glass with the liquid-crystal display module
  • light leakage caused when a lower substrate is deformed can be suppressed by using a filler having a low elastic modulus and a high elongation, thereby improving the durability of an LCD device.
  • an alignment error caused by the low modulus of the filler can be reduced by aligning the liquid-crystal display module with the cover glass using the alignment device after removing a bubble of the composition for the transparent adhesive.
  • the thickness of the unevenly thickened dam in the process of removing a bubble in the composition for a transparent adhesive can be corrected by pressing a specific portion of the cover glass using the alignment device, thereby making the thickness between the liquid-crystal display module and the cover glass uniform.
  • FIG. 1A is a perspective view for illustrating light leakage and durability reduction occurring in an LCD device
  • FIG. 1B is a cross-sectional view taken along line I - I 'of FIG. 1A for illustrating light leakage and durability reduction occurring in an LCD device;
  • FIG. 2A is a plan view for illustrating an LCD device according to an exemplary embodiment of the present disclosure
  • FIG. 2B is a cross-sectional view of the LCD device according to the exemplary embodiment of the present disclosure, taken along line II - II' of FIG. 2A;
  • FIG. 3 is a flowchart for illustrating a method of manufacturing LCD device according to an exemplary embodiment of the present disclosure
  • FIGS. 4A to 4E are cross-sectional views for illustrating a method of manufacturing an LCD device according to an exemplary embodiment of the present disclosure
  • FIGS. 5A to 5F are perspective views illustrating an alignment device for aligning a liquid-crystal display module and a cover glass according to an exemplary embodiment of the present disclosure
  • FIGS. 6A to 6C are a cross-sectional view and graphs for illustrating improved alignment accuracy of an LCD device according to an exemplary embodiment of the present disclosure, respectively.
  • FIGS. 7A to 7C are a cross-sectional view and graphs for illustrating the improved uniformity of the thickness between a cover glass and a liquid-crystal display module in an LCD device according to an exemplary embodiment of the present disclosure, respectively.
  • an element A on an element B refers to that the element A may be disposed directly on the element B and/or the element A may be disposed indirectly on the element B via another element C.
  • first, second and the like in the descriptions and in the claims are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. Theses terms are used to merely distinguish one element from another. Accordingly, as used herein, a first element may be a second element within the technical idea of the present disclosure.
  • FIG. 2A is a plan view for illustrating an LCD device according to an exemplary embodiment of the present disclosure.
  • FIG. 2B is a cross-sectional view of the LCD device according to the exemplary embodiment of the present disclosure, taken along line II - II' of FIG. 2A.
  • an LCD device 200 includes a liquid-crystal display module 210, a filler 260, a transparent adhesive 221, a dam 222, and a cover glass 230.
  • an upper substrate 212 of the liquid-crystal display module 210 and the cover glass 230 are not shown in FIG. 2.
  • Display elements disposed in a non-pad area NPA are omitted.
  • the liquid-crystal display module 210 includes a lower substrate 211, the upper substrate 212, a sealant 213, liquid crystals LC, a drive chip DI, a touch pad TP, a display printed circuit board 240, and a touch printed circuit board 250.
  • the lower substrate 211 supports various components of the LCD device 200 and may be a glass substrate or a plastic substrate.
  • the lower substrate 211 has a larger area than the upper substrate 230.
  • a side surface of the lower substrate 211 protrudes from a side surface of the upper substrate 212 corresponding thereto. Accordingly, a part of the upper surface of the lower substrate 211 is exposed.
  • the area where the part of the lower substrate 211 is exposed is defined as a pad area PA, while the area where the lower substrate 211 and the upper substrate 212 overlap with each other is defined as a non-pad area NPA.
  • the drive chip DI, the touch pad TP and the adhesive element 260 are disposed.
  • the non-pad area NPA display elements of pixels of the LCD device 200 and lines for delivering various signals to the display elements are disposed.
  • the non-pad area NPA is divided into a display area where a display element is arranged and an image is displayed, and a non-display area where lines connected to the display element are arranged and an image is not displayed.
  • the display device may include a thin film transistor (TFT), a pixel electrode connected to the thin film transistor, and a common electrode separated from the pixel electrode.
  • the lines transfer a voltage to drive the display element, and may be constituted by, for example, a gate line for transferring a gate voltage, a data line for transferring a data voltage, and a touch line for transferring a touch signal.
  • the non-pad area NPA is divided into a display area where display elements are disposed such that an image is displayed, and an non-display area where lines connected to the display elements are arranged and no image is displayed.
  • the display device may include a thin film transistor (TFT), a pixel electrode connected to the thin-film transistor, and a common electrode separated from the pixel electrode.
  • the lines transfer voltage to drive the display elements and may include, for example, a gate line for transferring a gate voltage, a data line for transferring a data voltage, and a touch line for transferring a touch signal.
  • the drive chip DI is connected to the display printed circuit board 240 and receives a signal from the display printed circuit board 240 to provide a driving voltage to the display elements.
  • the drive chip DI is not specifically shown in FIG. 2A, and instead the driving chip area in which the drive chip DI is disposed is indicated by a dotted line.
  • the drive chip DI may include a data driver for providing a data voltage to the display elements and/or a gate driver for providing a gate voltage to the display elements.
  • the drive chip DI may be mounted on the lower substrate 211 by using COG (Chip On Glass) technology.
  • the touch pad TP is connected to the touch print circuit board 250 and receives a touch signal from the touch line to transfer it to the touch print circuit board 250.
  • the touch pad TP is disposed on either side of the pad area PA so that it does not overlap with the drive chip DI.
  • the touch printed circuit board 250 is connected to the touch lines via the touch pad TP. In FIG. 2A, the touch pad TP is not specifically shown, and the touch pad area where the touch pad TP is disposed is indicated by a dotted line.
  • the filler 260 is disposed on either side of the pad area PA so that it partially overlaps with the touch pad TP.
  • the scope of the present disclosure is not limited thereto.
  • the filler 260 may be disposed on either side of the pad area PA so that it does not overlap with the touch pad TP.
  • the filler 260 has a rectangular shape in FIG. 2A, the shape of the filler 260 is not limited thereto.
  • the filler 260 may be formed in a polygonal shape, a circular shape, or an elliptic shape other than a rectangular shape.
  • the filler 260 is used to attach the lower substrate 211 to the cover glass 230 in the pad area PA, so that the deformation of the lower substrate 211 is suppressed even if the distance between the cover glass 230 and the lower substrate 211 varies. A detailed description on the filler 260 will be made below.
  • the upper substrate 212 overlaps with the lower substrate 211 in the non-pad area NPA.
  • the upper substrate 212 may be made of glass or transparent plastic having excellent light transmittance so that the image realized by the display elements can be displayed well.
  • the sealant 213 attaches the upper substrate 212 to the lower substrate 211.
  • the liquid crystals LC fill the space formed by the upper substrate 212, the lower substrate 211 and the sealant 213.
  • the sealant 213 seals between the upper substrate 212 and the lower substrate 211 to protect the display elements and the lines from the external environment.
  • the cover glass 230 covers the liquid-crystal display module 210 and may be made of glass having excellent rigidity or plastic having thermoformability and good processibility so as to protect the components of the liquid-crystal display module 210 from external impact, foreign matter or moisture.
  • the transparent adhesive 221 attaches the cover glass 230 and the liquid-crystal display module 210 between the upper substrate 212 of the liquid-crystal display module 210 and the cover glass 230.
  • the transparent adhesive 221 may be formed of an acrylate-based composition for a transparent adhesive that is cured by ultraviolet (UV) ray.
  • the composition for the transparent adhesive may comprise, for example, an acrylate-based monomer, an acrylate-based oligomer and an UV-sensitive initiator.
  • the dam 222 prevents the composition for the transparent adhesive 221 from overflowing when the composition is applied on the upper substrate 212.
  • the dam is made of the same composition as the transparent adjacent element 221.
  • the dam 222 is formed by applying the composition for the transparent adhesive so that it surrounds the periphery of the upper substrate 212, and then curing it. The dam 222 is cured before the transparent adhesive 221 is formed.
  • the filler 260 attaches the lower substrate 211 to the cover glass 230 and buffers an impact exerted on the lower substrate 211 in the pad area PA. Accordingly, the filler 260 may also be referred to as a buffer.
  • the lower substrate 211 overlaps with the upper substrate 212, and thus the liquid-crystal display module 210 has a double-substrate structure.
  • the pad area PA the lower substrate 211 is exposed alone. That is, as shown in FIG. 2A, in the pad area PA, the display printed circuit board 240 and the touch printed circuit board 250 comes in contact with the lower substrate 211 such that they are connected to the drive chip DI and the touch pad TP on the lower substrate 211. Accordingly, the upper surface of the lower substrate 211 is exposed in the pad area PA, and one side surface of the lower substrate 211 protrudes from the side surface of the upper substrate 230 corresponding thereto.
  • the part of the lower substrate 211 exposed in the pad area PA has a thickness smaller than that of the cover glass 230, such that the lower substrate 211 is vulnerable to external impact and is easily curved compared with the cover glass 230.
  • the filler 260 has a thickness corresponding to the distance between the cover glass 230 and the lower substrate 211 so as to minimize bending of the lower substrate 211 and keep the lower substrate 211 in a plat . That is, the thickness of the filler 260 may vary corresponding to the distance between the cover glass 230 and the lower substrate 211 when the distance between the cover glass 230 and the lower substrate 211 changes.
  • the filler 260 is a soft element having an elongation capable of adapting to a change in distance between the cover glass 230 and the lower substrate 211.
  • the filler 260 has a thickness equal to the distance between the cover glass 230 and the lower substrate 211 so that it can suppress the lower substrate 211 from being curved and keep the lower substrate 211 flat. If the distance between the cover glass 230 and the lower substrate 211 varies, the thickness of the filler 260 may vary so that it is equal to the distance between the cover glass 230 and the lower substrate 211. That is, the filler 260 is a soft element having an elongation that is adaptively changed with a change in distance between the cover glass 230 and the lower substrate 211.
  • the elongation of the filler 260 may be 300% or higher.
  • the elongation refers to a ratio of the deformed length to the original length of a specific material when a tensile force is applied to the specific material.
  • the elongation of the filler 260 is 300% or higher, even if the distance between the lower substrate 211 and the cover glass 230 changes during the manufacturing process of the LCD device 200, the lower substrate 211 and the cover glass 230 can keep being attached together due to the high elongation of the filler 260.
  • the filler may fail to adaptively change with the change in distance between the cover glass and the lower substrate, which may occur during the manufacturing process of the LCD device. That is, even though the distance between the cover glass and the lower substrate changes, the thickness of the filler element does not change. When this happens, the lower substrate may be curved toward the cover glass by the reduced length of the distance between the cover glass and the lower substrate.
  • the upper limit value of the elongation of the filler 260 is not particularly limited. That is, the filler is required to firmly attach the cover glass 230 and the lower substrate 211 to each other even if the distance between the cover glass 230 and the lower substrate 211 changes, and thus a higher elongation of the filler 260 is better.
  • the filler 260 has an elastic modulus suitable to absorb impact applied to the lower substrate 211. That is, the filler 260 is a soft element that can restore the deformed lower substrate 211 to its original shape even if the lower substrate 211 is deformed by an impact.
  • the filler 260 has an elastic modulus of 9 ⁇ 10 6 Pa or less.
  • the elastic modulus refers to the degree of resistance of a specific material against tensile stress or compressive stress and is defined as the ratio of the strain of the particular material to the stress.
  • the elastic modulus of the filler 260 refers to one measured at room temperature (25°C). If the elastic modulus of the filler 260 is 9 ⁇ 10 6 Pa or less, the filler 260 can absorb external impact between the cover glass 230 and the lower substrate 211, like a rubber does.
  • the lower limit value of the elastic modulus of the filler 260 is not particularly limited. That is, as the modulus of the filler 260 is lower, the filler 260 can absorb the external impact well and the durability of the LCD device can be improved. Therefore, a lower elastic modulus of the filler 260 is better.
  • the filler 260 is formed of a composition for a filler.
  • the filler 260 may be formed of an acrylate-based resin composition that is cured by ultraviolet (UV) irradiation.
  • UV ultraviolet
  • FIG. 3 is a flowchart for illustrating a method of manufacturing LCD device according to an exemplary embodiment of the present disclosure.
  • FIGS. 4A to 4E are cross-sectional views for illustrating the method of manufacturing an LCD device according to the exemplary embodiment of the present disclosure.
  • the method includes applying a composition for a filler 461 onto the lower substrate 211 of the liquid-crystal display module 210 (step S301).
  • the composition 461 may be applied in the pad area PA where a part of the upper surface of the lower substrate 211 is exposed.
  • the composition 461 may be applied on two corners of the pad area PA.
  • composition 461 is cured (S302). This is referred to as first curing.
  • the composition 461 may spread out to where the composition 461 is not applied.
  • the composition 461 may be subject to the first curing after being applied so that the composition 461 is not spread out to where it is not applied.
  • the first curing refers to pre-curing the composition 461 to the extent that the composition 461 is not completely cured. By performing the first curing, the viscosity of the composition 461 is improved, such that the composition 461 does not spread out to undesired area.
  • a composition for a transparent adhesive is applied along the periphery of the upper substrate 212 of the liquid-crystal display module 210 opposed to the lower substrate 211 (step S303).
  • the composition for the transparent adhesive may be applied to a predetermined thickness along the periphery of the upper substrate 212.
  • the thickness and the width of the composition for the transparent adhesive are not particularly limited, and may be applied at appropriate thickness and width so that the composition 423 for the transparent adhesive applied to the center portion of the upper substrate 212 does not overflow.
  • step S304 the composition for the transparent adhesive on the periphery of the upper substrate 212 is cured to form a dam 222.
  • the dam 222 suppresses the composition 423 for the transparent adhesive, which is applied to the central portion of the upper substrate 212, from overflowing. Therefore, the dam 222 is formed before the composition 423 is applied.
  • the dam 222 is not completely cured since it is to be attached to the cover glass 230 in a later process.
  • the dam 222 may be pre-cured to increase its viscosity in the same manner as the composition 461.
  • the composition 423 is applied so that it covers the upper surface of the upper substrate 212 on the inner side of the dam 222 (step S305).
  • the composition 423 may be applied such that it covers the entire surface of the upper substrate 212, but may be applied such that it covers only a part of the upper surface of the upper substrate 212, as shown in FIG. 4A. Since the applied composition 423 is not yet cured, the adhesive force is weak and has a very low viscosity. The composition 423 may spread out on the upper surface of the upper substrate 212, but the dam 222 formed along the periphery of the upper substrate 212 suppresses the composition 423 from overflowing.
  • the cover glass 230 is disposed such that it covers the liquid-crystal display module 210 (step S306).
  • the cover glass 230 may be moved to above the liquid-crystal display module 210 by a vacuum adsorber for vacuum-absorbing the upper surface of the cover glass 230.
  • the cover glass 230 may be aligned so that the edges of the cover glass 230 and the edges of the liquid-crystal display module 210 are parallel to each other.
  • the cured composition 461 is secondarily cured to form a filler 260 attached to the cover glass 230 (step S307). This is referred to as second curing.
  • the cover glass 230 is pressed so that the composition for the filler is brought into contact with the lower surface of the cover glass 230.
  • the cover glass 230 in order to increase the contact area between the cover glass 230 and the composition for the filler as large as possible, the cover glass 230 is excessively pressed, and the distance between the lower surface of the cover glass 230 and the upper surface of the lower substrate 211 may be reduced to be smaller than the thickness of the composition for the filler when it was first cured. Since the cover glass 230 is excessively pressed, the dam 222 may be compressed by the cover glass 230, such that the thickness of the dam 222 may be reduced.
  • UV ray is irradiated onto the composition for the filler to perform the second curing of the composition for the filler.
  • the composition for the filler is cured, and the filler 260 attached to the cover glass 230 and the lower substrate 211 is formed.
  • the filler element 260 after the second curing has the elastic modulus of 9 ⁇ 10 6 Pa or less, and has the elongation of 300% or higher.
  • step S308 air bubbles between the upper substrate 212 and the cover glass 230 are removed so that the composition 423 completely fill between the upper substrate 212 and the cover glass 230.
  • the pressure exerted to the cover glass 230 is released, and the process pressure is increased.
  • the sudden change in the pressure may cause the composition 423 to spread throughout the entire surface of the upper substrate 121.
  • the composition 423 may cover a part of the upper surface of the upper substrate 212 instead of the entire surface of the upper substrate 212. Since the transparent adhesive continuously attaches the cover glass 230 and the liquid-crystal display module 210 in the completed LCD device 200, it is necessary to increase the adhesive area of the transparent adhesive as much as possible. Therefore, it is necessary to spread the composition 423 for the transparent adhesive so that it covers the entire surface of the upper substrate 212 before the composition 423 is cured. When the pressure applied to the cover glass 230 is released and the process pressure suddenly rises, the composition 423 spreads out on the upper substrate 212 due to the sudden pressure change.
  • the thickness of the compressed dam 222 may be returned to the original thickness due to the resilience force of the dam 222.
  • the cover glass 230 can rise upward as the thickness of the dam 222 increases, and tensile stress is generated in the filler 260 attached to the cover glass 230.
  • the filler 260 since the filler 260 has a high elongation, it can continuously fill between the cover glass 230 and the lower substrate 211 even if the cover glass 230 is raised upwardly, such that the adhesion between the cover glass 230 and the lower substrate 211 can be maintained.
  • the filler has a low elongation
  • the filler also rises with the cover glass. Since the thickness of the filler is kept constant due to the low elongation of the filler, a part of the lower substrate attached to the filler may be raised and curved as the filler is raised. When this happens, the lower substrate may be curved such that the orientations of some liquid crystals may be tilted. As a result, light may leak from the tilted liquid crystals.
  • the filler 260 of the LCD device 200 has a high elongation of 300% or more, even if the cover glass 230 is raised due to the resilience force of the dam 222, the thickness of the filler 260 can be increased and the distance between the cover glass 230 and the lower substrate 211 can be maintained. Accordingly, it is possible to suppress the lower substrate 211 from being curved and reduce light leakage.
  • the composition 423 may fail to sufficiently fill between the upper substrate 212 and the cover glass 230, such that a bubble VO may be created. If the composition 423 is cured with the bubble VO, the cover glass 230 and the liquid-crystal display module 210 may not be firmly attached together. In addition, if the bubble VO exists in the display area, the visibility of the LCD device 200 may deteriorate due to the bubble VO. Therefore, it is essential to carry out a process of removing the bubble VO between the composition 423 and the cover glass 230 prior to the composition 423 is cured. The process of removing the bubble VO may be carried out by exposing the LCD device 200 to a high temperature for a predetermined period of time.
  • the filler 260 and the dam 222 are exposed to a high-temperature environment for a predetermined period of time and thus they may be expanded.
  • the corners of the dam 222 may be likely to be expanded. This is because a relatively large amount of the composition for the transparent adhesive is applied to the corners during the process of forming the dam 222.
  • the dam 222 is formed by applying a composition for a transparent adhesive along the periphery of the upper substrate 212 and curing it. However, during the process of applying the composition for the transparent adhesive, the composition may be applied to the corners of the upper substrate 212 more than necessary. When this happens, the thickness of the corners of the dam 222 may be larger than the other portions. Further, as the dam 222 is expanded in the high temperature environment, the corners of the dam 222 may be expanded more than the other portions. As a result, the thickness of the dam 222 may becomes uneven during the process of removing the bubble VO.
  • the liquid-crystal display module 210 may be inclined with respect to the flat upper surface of the cover glass 230, such that the touch performance of the LCD device 200 may be deteriorated.
  • three-dimensional touch sensing technology that detects the coordinates of a touch input as well as the intensity of a touch input is being studied.
  • the intensity of a touch input may be sensed by a pressure sensor, which senses the intensity of the touch input by sensing a change in an air gap above the pressure sensor.
  • the pressure sensor may be disposed below the liquid-crystal display module 210.
  • the pressure sensor may be disposed under a backlight unit coupled with the liquid-crystal display module 210.
  • the distance between the cover glass 230 and the liquid-crystal display module 210 may becomes uneven, such that the lower surface of the liquid-crystal display module 210 may be inclined with respect to the flat upper surface of the cover glass 230.
  • the backlight unit disposed under the liquid-crystal display module 210 is also inclined, such that the gap between the backlight unit and the pressure sensor may become uneven.
  • the gap between the backlight unit and the pressure sensor becomes ununiform, the air gap above the pressure sensor may also be changed. As a result, the pressure sensor cannot accurately measure the intensity of a touch input, and the touch performance of the LCD device 200 may be deteriorated.
  • the alignment between the cover glass 230 and the liquid-crystal display module 210 may be distorted. That is, as the composition for the transparent adhesive 423 has a weak adhesive force before it is cured, it cannot attach the cover glass 230 to the upper substrate 212. Meanwhile, the cover glass 230 is attached to the upper substrate 212 by the filler 260. However, since the elastic modulus of the filler 260 is low, the filler 260 may not effectively maintain the alignment between the cover glass 230 and the lower substrate 211. That is, when the cover glass 230 deviates from the alignment with the lower substrate 211 during the movement of the LCD device 200, the resilience force of the filler 260 may not strong enough to recover the alignment between the cover glass 230 and the lower substrate 211.
  • a method of manufacturing an LCD device re-aligns the liquid-crystal display module 210 with the cover glass 230.
  • the alignment between the cover glass 230 and the upper substrate 212 is adjusted while pressing the cover glass 230 so that the dam 222 is compressed (step S309).
  • the re-alignment between the cover glass 230 and the upper substrate 212 may be performed by an alignment device for aligning a liquid-crystal display module with the cover glass according to an exemplary embodiment of the present disclosure.
  • the configurations of the liquid-crystal display module and the alignment device will be described below with reference to FIGS. 5A to 5F.
  • a process of re-aligning the cover glass 230 with the liquid-crystal display module 210 will be described in detail.
  • the cover glass 230 and the liquid-crystal display module 210 are disposed on a supporting unit 490.
  • the supporting unit 490 is configured to vacuum-adsorb the lower substrate 211 of the liquid-crystal display module 210 and to move the liquid-crystal display module 210 in the x-y plane.
  • portions of the cover glass 230 corresponding to the corners of the dam 222 are pressed by a pressing unit 470 so that the corners of the dam 222 are compressed.
  • the pressing unit 470 presses the corners of the excessively expanded corners of the dam 222 to maintain the thickness of the dam 222 substantially uniform.
  • the pressing unit 470 presses the portions of the cover glass 230 corresponding to the corners of the dam 222 at a force from 40 to 200 gf so that the thickness of the dam 222 is maintained substantially uniform. If the pressing force of the pressing unit 470 is less than 40 gf, the corners of the dam 222 may be thicker than the other portions, which is undesirable. If the pressing force of the pressing unit 470 is greater than 200 gf, on the other hand, the corners of the dam 222 may be thinner than the other portions, which is also undesirable.
  • the position of the supporting unit 490 may be moved so as to align the cover glass 230 with the liquid-crystal display module 210. Since the supporting unit 490 vacuum-adsorbs the lower substrate 211 of the liquid-crystal display module 210, the position of the liquid-crystal display module 210 can be moved with the supporting unit 490. As the cover glass 230 and the liquid-crystal display module 210 are attached together by the filler 260 having a low elastic modulus, the position of the liquid-crystal display module 210 relative to the cover glass 230 may be changed.
  • ultraviolet ray is irradiated onto the cover glass 230 so that a part of the composition 423 between the cover glass 230 and the upper substrate 212 is cured.
  • the ultraviolet ray is irradiated to the composition 423 through the transparent cover glass 230.
  • the composition 423 is partially cured, such that the upper substrate 212 and the cover glass 230 are attached together in some areas.
  • the composition 423 filling between the cover glass 230 and the upper substrate 212 is cured, such that the cover glass 230 and the liquid-crystal display module 210 are attached together (step S310).
  • the pressing unit is separated from the cover glass 230, and the cover glass 230 is irradiated with the ultraviolet ray to cure the composition for the transparent adhesive.
  • the cover glass 230 and the upper substrate 212 are attached together by curing the composition in some areas, the cover glass 230 can be aligned with the liquid-crystal display module 210 even after the pressing unit is removed.
  • the thickness of the corners of the dam 22 can also be maintained being compressed. Accordingly, the composition for the transparent adhesive can be cured while the alignment between the cover glass 230 and the liquid-crystal display module 210 is maintained, and the thickness of the dam 222 is maintained substantially uniform.
  • the composition for the transparent adhesive is cured to form a transparent adhesive 221.
  • the dam 222 and the transparent adhesive 221 are shown as different elements in FIG. 4E, the dam 222 and the transparent adhesive 221 are formed of the same composition for the transparent adhesive, and thus the transparent adhesive 221 and the dam 222 are formed as a single adhesive element as the composition for the transparent adhesive is cured.
  • the filler 260 has a low elastic modulus, and thus the impact exerted to the LCD device 200 can be absorbed by the filler 260.
  • the filler 260 having a low elastic modulus is disposed between the cover glass 230 and the lower substrate 211, and thus the impact exerted in the pad area PA can be absorbed by the filler 260. Accordingly, the durability of the LCD device 200 can be improved.
  • the filler 260 since the filler 260 has a high elongation, it is possible to suppress the lower substrate 211 from being curved during the process of attaching the cover glass 230 to the liquid-crystal display module 210. That is, even if the distance between the lower substrate 211 and the cover glass 230 changes, the filler 260 may be changed to have the thickness equal to the distance, such that the cover glass 230 can be continuously attached to the lower substrate 211.
  • the alignment between the cover glass 230 and the liquid-crystal display module 210 may be distorted again due to the low modulus and high elongation of the filler 260.
  • the alignment between the cover glass 230 and the liquid-crystal display module 210 is re-adjusted to thereby suppress the alignment between the cover glass 230 and the liquid-crystal display module 210 from being distorted.
  • the corners of the dam 222 may be excessively expanded during the process of removing the bubble in the composition 423, thereby causing a problem that the thickness of the dam 222 becomes uneven.
  • the corners of the dam 222 are pressed by using the pressing unit 470 and a part of the composition 423 is cured, such that the thickness of the dam 222 can be uniformly maintained. In this manner, it is possible to reduce the defects that may occur during the process of manufacturing the LCD device 200 including the pressure sensor for sensing the intensity of a touch input.
  • FIGS. 5A to 5F are perspective views illustrating an alignment device for aligning a liquid-crystal display module with a cover glass according to an exemplary embodiment of the present disclosure.
  • the durability of the LCD device is improved, and the light leakage caused when the lower substrate of the liquid-crystal display module is curved can be reduced.
  • the alignment between the cover glass and the liquid-crystal display module may be distorted, or the thickness between the cover glass and the liquid-crystal display module may become ununiform.
  • the liquid-crystal display module and the cover glass alignment device (hereinafter, referred to as an alignment device) includes a supporting unit 490, a camera unit 480, a pressing unit 470 and a curing unit 495.
  • the supporting unit 490 supports the LCD device 200 including the liquid-crystal display module and the cover glass.
  • the supporting unit 490 includes a support 493, a first moving part 491, and a second moving part 492.
  • the support 493 supports the liquid-crystal display module of the LCD device 200.
  • the support 493 may include a plurality of holes and a vacuum pump connected with the holes to vacuum-adsorb the liquid-crystal display module.
  • the first moving part 491 and the second moving part 492 are connected to the support 493 and are configured to move the support 493 on the x-y plane.
  • the first moving part 491 moves the support 493 in the x-axis direction while the second moving part 492 moves the support 493 in the y-axis direction.
  • the camera unit 480 is disposed above the supporting unit 490 and captures an image of a specific point of the cover glass to inspect the alignment between the cover glass and the liquid-crystal display module.
  • the camera unit 480 includes at least one camera 481 and an illumination device 482.
  • the camera unit 480 includes four cameras 481 and four illumination devices 482.
  • the four cameras 481 may capture images of four corners of the LCD device 200, and the four illumination devices 482 may irradiate light to the four corners of the LCD device 200.
  • the pressuring unit 470 is disposed above the supporting unit 490 and is configured to press the cover glass.
  • the pressing unit 470 is configured to press a specific portion of the periphery of the upper substrate of the liquid-crystal display module.
  • the pressing unit 470 includes a moving part 471, a frame 472, protruding bodies 473, and protrusions 474.
  • the moving part 471 moves the pressing unit 470 in the z-axis direction and is connected to the frame 472.
  • the frame 472 is connected to the protruding bodies 473 and supports them.
  • the frame 472 has an open center portion, and the cover glass is exposed via the open center portion of the frame.
  • the protruding body 473 protrudes toward the central portion of the frame 472 to overlap with the cover glass and is connected to the protruding portion 474.
  • the protrusion 474 protrudes from the bottom surface of the protrusion body 473 to press a specific portion of the cover glass and overlaps with the specific portion of the cover glass.
  • the pressing unit 470 will be described in more detail with reference to FIGS. 5D and 5E.
  • FIGS. 5D and 5E show the LCD device 200 pressed by the protrusion 474 of the pressing unit 470.
  • the protruding body 473 is connected to the bottom surface of the frame 472 and extends inward of the frame 472 so that the protrusions 474 overlap with specific portions of the cover glass.
  • the protruding body 473 includes a body portion 473a, a ball slider 473b, a guide shaft 473c, and a spring 473d.
  • the guide shaft 473c is a cylinder disposed in the body portion 473a
  • the ball slider 473b is disposed in the guide shaft 473c to press the spring 473d.
  • the spring 473d is disposed between the ball slider 473b and the protrusions 474 and transfers the pressure of the ball slider 473b to the protrusions 474.
  • the spring 473d works as a buffer between the ball slider 473b and the protrusions 474 so that the protrusion 474 does not excessively press the cover glass 230.
  • a pressurizing pump 475 is connected to the frame 472 to apply a hydraulic pressure to the upper surface of the ball slider 473b.
  • the hydraulic pressure by the pressurizing pump 475 is transferred to the protrusions 474 through the ball slider 473b and the spring 473d.
  • the pressurizing pump 475 can provide an appropriate hydraulic pressure to the ball slider 473b so that the protrusions 474 press the cover glass 230 at a force of 40 gf to 200 gf.
  • the protrusions 474 protrudes from the protruding body 473 and presses a specific portion of the cover glass 230 with a uniform pressure.
  • the protrusions 474 are disposed along the periphery of the upper substrate to press the corners of the dam.
  • the protrusions 474 have a thickness such that the thickness of the corners of the dam remains equal to the thickness of the other portion.
  • the protrusions 474 has the thickness of 60 ⁇ m.
  • the protrusions 474 may be formed of, but is not limited to, a rubber material to prevent damage to the cover glass 230.
  • the curing unit 495 is disposed above the supporting unit 490 and is configured to irradiate the cover glass 230 with ultraviolet ray while the pressing unit 470 presses the cover glass 230.
  • the curing unit 495 includes a light-emitting lamp (LED) for irradiating ultraviolet ray.
  • the light-emitting lamp (LED) is disposed such that it is in line with the open center portion of the frame 472 of the pressing unit 470.
  • the ultraviolet ray emitted from the light-emitting lamp (LED) pass through the frame 472 of the pressing unit 470 to be irradiated to the cover glass 230, such that the composition for the transparent adhesive between the cover glass 230 and the liquid-crystal display module 210 is partially cured.
  • the alignment device includes the supporting unit 490 that supports a liquid-crystal display module 210 and the cover glass 230, the camera unit 480 that captures an image of a specific portion of the cover glass 230, and a pressing unit 470 that presses a specific portion of the cover glass 230.
  • the alignment device may rearrange the alignment of the liquid-crystal display module 210 by moving the supporting unit 490 while pressing a specific portion of the cover glass 230. Therefore, the issue on the alignment between the cover glass 230 and the liquid-crystal display module 210 possibly caused by the low modulus of the filler 260 can be suppressed, and the productivity of the LCD device 200 can be improved.
  • the alignment device includes the protrusions 474 to press the respective corners of the dam 222 disposed along the periphery of the upper substrate 212 of the liquid-crystal display module 210, and the curing unit 495 to partially cure the composition 423 for the transparent adhesive while the dam 222 is pressed. Accordingly, the thickness of the dam 222 can be uniformly maintained and the reliability of the LCD device including the pressure sensor can be improved.
  • the protrusions 474 of the pressurizing unit 470 press the corners of the dam 222, and the composition 423 can be partially cured by the curing unit 495 while the dam 222 is pressed. Accordingly, the thickness of the dam 222 can be maintained substantially uniform, and the air gap in the LCD device 200 can be maintained. Accordingly, the pressure sensor included in the LCD device 200 can accurately detect the intensity of a touch input by a user.
  • FIGS. 6A to 6C are a cross-sectional view and graphs for illustrating improved alignment accuracy of an LCD device according to an exemplary embodiment of the present disclosure, respectively.
  • FIG. 6A is a plan view for illustrating a method of measuring alignment accuracy of an LCD device.
  • FIG. 6B is a graph showing alignment accuracy of a LCD device according to Comparative Example.
  • FIG. 6C is a graph showing alignment accuracy of an LCD device according to an exemplary embodiment of the present disclosure.
  • the screen of a LCD device includes a display area DA where images are displayed, and a non-display area NDA where no image is displayed.
  • the non-display area NDA refers to the area between the boundary of the display area DA and the boundary of the case or cover of the LCD device where no image is displayed.
  • the accurately of the alignment between the cover glass and the liquid-crystal display module can be obtained by measuring the width of the non-display area NDA.
  • the width of the non-display area NDA was measured at two points on each of upper, lower, left, and right sides of the LCD device.
  • the width of the non-display area NDA was measured at two points y1 and y2 of the upper end portion, two points y3 and y4 of the lower end portion, two points x1 and x4 of the left portion and two points x2 and x3 of the right portion of the LCD device.
  • the width of the non-display area NDA is all 0.5 mm.
  • the LCD device shown in FIG. 6B was manufactured according to Comparative Example without using the alignment device according to an exemplary embodiment of the present disclosure.
  • the LCD device shown in FIG. 6C was manufactured by using an alignment device according to an exemplary embodiment of the present disclosure. Both of the LCD devices have the same configuration. Specifically, each of the LCD devices includes a filler having a low modulus of 7.3 ⁇ 10 4 Pa, and a dam and a transparent adhesive formed of the same material by the same process.
  • the graphs shown in FIGS. 6B and 6C were obtained by measuring thirty-two samples of LCD devices, respectively. In the graphs shown in FIGS. 6B and 6C, the rectangular boxes mean deviations of the measurements of thirty-two samples, and the dots mean averages of the measurements.
  • the width of the non-display area NDA of the LCD device according to Comparative Example has been changed without using the alignment device according to the embodiment of the present disclosure. That is, it can be seen that the width of the non-display area NDA deviated by 0.2 mm or more from the ideal width of 0.5 mm at the points x3 and x4.
  • the width of the non-display area NDA of the LCD device according to the exemplary embodiment of the present disclosure is kept constant by using the alignment device. That is, it can be seen that the widths of the non-display area NDA approximates to 0.5 mm at all points of the LCD device.
  • the non-display area NDA of the LCD device can have a uniform width, and the defective rate of the LCD device due to misalignment can be remarkably reduced.
  • FIGS. 7A to 7C are a cross-sectional view and graphs for illustrating the improved uniformity of the thickness between a cover glass and a liquid-crystal display module in an LCD device according to an exemplary embodiment of the present disclosure.
  • FIG. 7A is a plan view for illustrating a method of measuring uniformity of the thickness between the cover glass and the liquid-crystal display module.
  • FIG. 7B is a graph showing the uniformity of the thickness between the cover glass and the liquid-crystal display module of an LCD device according to Comparative Example.
  • FIG. 7C is a graph showing the uniformity of the thickness between the cover glass and the liquid-crystal display module of an LCD device according to an exemplary embodiment of the present disclosure.
  • the uniformity of the thickness between the cover glass and the liquid-crystal display module of the LCD device can be calculated by measuring the thickness between the cover glass and the liquid-crystal display module at randomly selected points. The total of twenty-five points are shown in FIG. 7A. Ideally, the thickness between the cover glass and the liquid-crystal display module of the LCD device is 150 ⁇ m at all points.
  • the LCD device according to Comparative Example shown in FIG. 7B was manufactured without using the alignment device according to an exemplary embodiment of the present disclosure.
  • the LCD device shown in FIG. 7C was manufactured by using an alignment device according to an exemplary embodiment of the present disclosure. Both of the LCD devices have the same configuration. Specifically, each of the LCD devices includes a filler having a low modulus of 7.3 ⁇ 10 4 Pa, and a dam and a transparent adhesive formed of the same material by the same process.
  • the graphs shown in FIGS. 7B and 7C were obtained by measuring thirty-two samples of LCD devices, respectively. In the graphs shown in FIGS. 7B and 7C, the rectangular boxes mean deviations of the measurements of thirty-two samples, and the dots mean averages of the measurements.
  • the thickness between the cover glass and the liquid-crystal display module is not uniform. Specifically, it can be seen that the thickness between the cover glass and the liquid-crystal display module is larger than the ideal thickness of 150 ⁇ m by 23 ⁇ m or more at point A18. That is, since the thickness of the dam disposed along the periphery of the upper substrate is not uniform, the thickness between the cover glass and the liquid-crystal display module becomes ununiform.
  • the thickness between the cover glass and the liquid-crystal display module is uniform. Specifically, it can be seen that the thickness between the cover glass and the liquid-crystal display module of the LCD device according to an exemplary embodiment of the present disclosure is within 150 ⁇ m ⁇ 23 ⁇ m at all points.
  • the LCD device includes a filler having a low modulus and a high elongation, so that it is possible to suppress the lower substrate from being curved possibly occurring during the manufacturing process. Accordingly, the light leakage possibly occurring when the lower substrate is curved can be suppressed, and the number of rejected LCD devices due to light leakage can be reduced. Accordingly, the productivity of the LCD devices can be improved.
  • the filler with a low modulus can effectively absorb impact applied to the LCD device, there is an advantage that the durability of the LCD device can be improved.
  • the LCD device according to an exemplary embodiment of the present disclosure is manufactured using the alignment device according to an exemplary embodiment of the present disclosure, and thus the alignment between the cover glass and the liquid-crystal display module can be rearranged, thereby solving the above-described problem.
  • the dam may be expanded ununiformly, resulting in a problem that the thickness between the cover glass and the liquid-crystal display module becomes ununiform.
  • an LCD device including a pressure sensor for detecting the intensity of a user's touch input may not accurately detect the intensity of a touch input when the thickness between the cover glass and the liquid-crystal display module is not uniform.
  • the LCD device according to an exemplary embodiment of the present disclosure is manufactured using the alignment device according to an exemplary embodiment of the present disclosure, and thus the thickness of the dam can be uniformly corrected, and the thickness between the cover glass and the liquid-crystal display module can be maintained uniformly.
  • an alignment device for a liquid-crystal display module and a cover glass includes a supporting unit, a camera unit and a pressing unit.
  • the supporting unit supports the liquid-crystal display module and is movable.
  • the camera unit captures an image of the cover glass to inspect the alignment between the cover glass and the liquid-crystal display module attached together by a filler.
  • the pressing unit presses the cover glass, and is configured to press a specific portion of the cover glass corresponding to the periphery of the upper substrate of the liquid-crystal display module.
  • the pressing unit may include a protrusion pressing the specific portion of the cover glass corresponding to a specific portion of a dam disposed along the periphery of the upper substrate.
  • the protrusion may have a thickness so that a thickness of the specific portion of the dam is equal to that of other portions of the dam.
  • the pressing unit may include a moving part moving the protrusion up and down, and a spring supporting the protrusion.
  • the pressing unit may press the cover glass at a force from 40 to 200 gf.
  • the device may further include: a curing unit configured to irradiate ultraviolet (UV) ray onto the cover glass while the pressing unit presses the cover glass.
  • a curing unit configured to irradiate ultraviolet (UV) ray onto the cover glass while the pressing unit presses the cover glass.
  • the supporting unit may include a support vacuum-adsorbing the liquid-crystal display module to support it, and a moving part moving the support on a x-y plane.
  • a method of manufacturing a liquid-crystal display (LCD) device includes: applying a composition for a filler on a lower substrate of a liquid-crystal display module; perform first curing to cure the composition for a filler; applying a composition for a transparent adhesive along a periphery of an upper substrate of the liquid-crystal display module opposed to the lower substrate; forming a dam by curing the composition for the transparent adhesive on the periphery of the upper substrate; applying the composition for the transparent adhesive such that it covers the upper surface of the upper substrate on an inner side of the dam; disposing a cover glass so that it cover the liquid-crystal display module; forming a filler attached to the cover glass by performing second curing to cure the composition for a filler cured by the first curing; removing a bubble between the upper substrate and the cover glass so that the composition for a transparent adhesive fills between the upper substrate and the cover glass; aligning the cover glass with the liquid-crystal display module while pressing
  • the aligning may include: disposing the cover glass and the liquid-crystal display module on the supporting unit; pressing a portion of the cover glass corresponding to a corner of the dam so that the corner of the dam is compressed; moving a location of the support so that the cover glass is aligned with the liquid-crystal display module; and curing a part of the composition for a transparent adhesive between the cover glass and the upper substrate by irradiating ultraviolet ray onto the cover glass.
  • the pressing a portion of the cover glass may include pressing the portion of the cover glass at a force from 40 to 200 gf.
  • the forming the filler attached to the cover glass may include curing the filler so as to has an elastic modulus of 9 ⁇ 10 6 Pa or less.
  • the forming a filler attached to the cover glass may include curing the filler so as to has an elongation of 300% or higher.

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  • Liquid Crystal (AREA)

Abstract

La présente invention concerne un dispositif d'alignement pour un module d'affichage à cristaux liquides et un verre de protection, et un procédé de fabrication d'un dispositif d'affichage à cristaux liquides utilisant un tel verre de protection. Le dispositif d'alignement comporte une unité de support, une unité de caméra et une unité de pressage. L'unité de support assure le support du module d'affichage à cristaux liquides et est mobile. L'unité de caméra capture une image du verre de protection pour inspecter l'alignement entre le verre de protection et le module d'affichage à cristaux liquides assemblés par une charge. L'unité de pressage presse le verre de protection, et est configurée pour presser une partie spécifique de la périphérie du substrat supérieur du module d'affichage à cristaux liquides.
PCT/KR2017/002590 2016-03-15 2017-03-09 Dispositif d'alignement pour module d'affichage à cristaux liquides et verre de protection et procédé de fabrication de dispositif d'affichage à cristaux liquides utillisant un tel verre de protection Ceased WO2017160025A1 (fr)

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CN201790000743.6U CN209343072U (zh) 2016-03-15 2017-03-09 用于液晶显示模块和盖玻璃的对准装置

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KR1020160030750A KR102653288B1 (ko) 2016-03-15 2016-03-15 액정 표시 모듈과 커버 글래스의 얼라인 장치 및 이를 이용한 액정 표시 장치의 제조 방법
KR10-2016-0030750 2016-03-15

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WO2017160025A1 true WO2017160025A1 (fr) 2017-09-21

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EP4020947A4 (fr) * 2019-12-24 2022-11-02 Honor Device Co., Ltd. Terminal mobile

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CN115044328A (zh) * 2022-07-21 2022-09-13 京东方科技集团股份有限公司 显示装置和填充胶水

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CN209343072U (zh) 2019-09-03
KR20170107170A (ko) 2017-09-25
KR102653288B1 (ko) 2024-03-29

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