WO2007126281A1 - Lcd window laminated with reinforced glass sheet and method of mamufacturing the same - Google Patents

Lcd window laminated with reinforced glass sheet and method of mamufacturing the same Download PDF

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Publication number
WO2007126281A1
WO2007126281A1 PCT/KR2007/002118 KR2007002118W WO2007126281A1 WO 2007126281 A1 WO2007126281 A1 WO 2007126281A1 KR 2007002118 W KR2007002118 W KR 2007002118W WO 2007126281 A1 WO2007126281 A1 WO 2007126281A1
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WO
WIPO (PCT)
Prior art keywords
synthetic resin
coating layer
resin substrate
adhesive coating
thickness
Prior art date
Application number
PCT/KR2007/002118
Other languages
French (fr)
Inventor
Seung-Uk Lee
Original Assignee
Seung-Uk Lee
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 Seung-Uk Lee filed Critical Seung-Uk Lee
Publication of WO2007126281A1 publication Critical patent/WO2007126281A1/en

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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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10018—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising only one glass sheet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B32B17/10706—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer being photo-polymerized
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

Definitions

  • the present invention relates to an LCD window laminated with a reinforced glass sheet and method of manufacturing the same, and more particularly to, an LCD window in which a reinforced glass sheet is laminated on the outer surface of a typical synthetic resin substrate to thereby effectively protect an LCD panel from an external impact such as scratching, pressing or the like despite a great decrease in its thickness, and especially no micro-bubble remains in an adhesive layer formed between the synthetic resin substrate and the reinforced glass sheet, to thereby significantly improve transparency and adhesive strength, and a method of manufacturing the same.
  • an LCD stands for a liquid crystal display, and is configured such that a liquid crystal material is injected into a space between two glass substrates, i.e., two LCD panels.
  • a liquid crystal material is injected into a space between two glass substrates, i.e., two LCD panels.
  • arrangement of respective liquid crystal molecules is changed.
  • a variety of characters or images are displayed on the LCD panel depending on a variation of the optical refractive index. Since such an LCD is typically driven with a power source of 1.5 to 2 V and has a very lower power consumption, it is widely used in PDAs, MP3s, computer monitors, TV sets and so forth.
  • an LCD window refers to a transparent protective window that is mounted on the outer surface of the LCD panel so as to protect the LCD panel from an external impact.
  • This LCD window is mainly composed of a synthetic resin substrate containing a synthetic resin such as acryl resin, polycarbonate (PC), polyethylene terephthalate (PET), etc.
  • a synthetic resin such as acryl resin, polycarbonate (PC), polyethylene terephthalate (PET), etc.
  • the present invention has been made in an effort to solve the aforementioned problems occurring in the prior art, and it is an object of the present invention to provide an LCD window in which a reinforced glass sheet is laminated on the outer surface of a typical synthetic resin substrate to thereby effectively protect an LCD panel from an external impact such as scratching, pressing or the like despite a great decrease in its thickness, no moire phenomenon occurs and especially no micro- bubble remains in an adhesive layer formed between the synthetic resin substrate and the reinforced glass sheet, to thereby significantly improve transparency and adhesive strength, and a method of manufacturing the same.
  • an LCD window adapted to be mounted on the outer surface of an LCD panel to protect the LCD panel from an external impact
  • the LCD window comprising a synthetic resin substrate having a thickness of 20 to 500 D, a UV adhesive coating layer laminated on the synthetic resin substrate to a thickness of 5 to 100 D, and a reinforced glass sheet adhered to the UV adhesive coating layer to a thickness of 200 to 1000 D.
  • UV ultraviolet
  • the LCD window according to the present invention will contribute to slimness of various digital electronic devices such as PDAs, MP3s, computer monitors, TV sets and so forth as having a reinforced glass sheet coated on the outer surface of a typical synthetic resin substrate to thereby effectively protect an LCD panel from an external impact such as scratching, pressing or the like despite a great decrease in its thickness.
  • the LCD window according to the present invention has a merit that the
  • UV adhesive coating layer is distributed to a uniform thickness between the synthetic resin substrate and the reinforced glass sheet and no micro-bubbles remain within the UV adhesive coating layer to result in no change of the refractive index or transparency, and particularly no moire phenomenon occur.
  • the LCD window according to the present invention comprises a synthetic resin substrate having a thickness of 20 to 500 D, a UV adhesive coating layer laminated on the synthetic resin substrate to a thickness of 5 to 100 D, and a reinforced glass sheet adhered to the UV adhesive coating layer to a thickness of 200 to 1000 D.
  • the synthetic resin substrate can employ whichever synthetic resin material used to manufacture a conventional LCD window, but preferably employs acryl resin, polycarbonate (PC), polyethylene terephthalate (PET), etc.
  • the thickness of the synthetic resin substrate can be modified depending on the size of the LCD panel or the characteristics of an electronic device on which the LCD panel is mounted, but preferably is in a range between 20 to 500 D.
  • a UV adhesive is used as an adhesive for mutually adhering the synthetic resin substrate and the reinforced glass sheet to each other so as to effectively adhere the synthetic resin substrate and the reinforced glass sheet whose materials are different from each other and to prevent bubbles from being generated within the UV adhesive coating layer.
  • the UV adhesive is an anaerobic adhesive which is so-called an ultraviolet (UV) curing adhesive. Since this UV adhesive typically maintains a liquid phase prior to curing and allows an optically responsive initiator contained in the adhesive to initiate a reaction at the time of irradiation of an ultraviolet ray to the UV adhesive coating layer so that it is solidified in a short time, it is very suitable for the adhesion between the synthetic resin substrate and the reinforced glass sheet.
  • the UV adhesive can use an acryl- based or epoxy-based UV adhesive.
  • the thickness of the UV adhesive coating layer is set to be in a range between 5 to
  • the thickness of the UV adhesive coating layer is less than 5 D, the adhesion strength may be weakened. On the contrary, if the thickness of the UV adhesive coating layer is more than 100 D, there is no increase in the adhesion strength and rather an over flow phenomenon occurs where the adhesive layer material forcibly flow out from the reinforced glass sheet or micro-bubbles remain in the adhesive layer to adversely affect the transparency and the refractive index of the entire LCD window.
  • the reinforced glass sheet laminated on the UV adhesive coating layer is formed of a thin sheet of glass having a thickness of 200 to 1000 D.
  • the thickness of the thin sheet of glass is less than 200 D, the strength is so weakened that the thin sheet of glass may fail to sufficiently perform an intrinsic function of a reinforced sheet.
  • the thickness of the thin sheet of glass is more than 1000 D, the thickness of the entire LCD window is increased very greatly, undesirably leading to go against a slimness trend of the LCD.
  • a synthetic resin substrate having a thickness of 20 to 500 D and a thin sheet of glass having a thickness of 200 to 1000 D that are cut into a predetermined shape are provided.
  • the synthetic resin substrate and the thin sheet of glass may be fabricated in the size and shape identical to each other, and the thin sheet of glass may be fabricated in the size and shape smaller than the synthetic resin substrate so that the thin sheet of glass can be adhered to only a part of the synthetic resin substrate.
  • a UV adhesive is coated on any one surface of the synthetic resin substrate or the thin sheet of glass, or both facing surfaces of the synthetic resin substrate and the thin sheet of glassto form a UV adhesive coating layer having a thickness of 5 to 100 D.
  • the coating method may be performed such that the synthetic resin substrate or the thin sheet of glass is fixed on a jig inside a clean room, and then the UV adhesive is coated on the synthetic resin substrate or the thin sheet of glass by means of any one of silk screen coating, roll coating, etc., but preferably the UV adhesive is evenly coated on the synthetic resin substrate or the thin sheet of glass by means of silk screen coating using a rubber blade. A special attention must be paid so that the UV adhesive is not exposed to an ultraviolet ray in the course of coating the UV adhesive.
  • the synthetic resin substrate and the thin sheet of glass are compressed to each other with the UV adhesive coating layer being sandwiched therebetween in a state where the inner pressure of a hermetically sealed space is reduced to 0.1 to 200 torr. If doing so, micro- bubbles are completely removed within the UV adhesive coating layer while the UV adhesive coating layer is diffused into a uniform thickness, and the synthetic resin substrate and the thin sheet of glass are closely adhered to each other. At this time, if the atmospheric pressure applied to the UV adhesive coating layer is more than 200 torr, there is a risk that the micro-bubbles may be completely not removed within the UV adhesive coating layer but residual bubbles may be generated in the UV adhesive coating layer.
  • an ultraviolet (UV) light is irradiated to the UV adhesive coating layer from which the micro-bubbles are completely removed to thereby cure the UV adhesive coating layer.
  • the illuminance or the amount of energy of the UV ray varies depending on the thickness of the UV adhesive coating layer.
  • the ultraviolet (UV) light is irradiated to the UV adhesive coating layer with an illuminance of 5 to 900 mW for one to five minutes. Then, the UV adhesive coating layer is completely cured to thereby finish the LCD window according to the present invention.
  • the LCD window according to the present invention will contribute to slimness of various digital electronic devices such as PDAs, MP3s, computer monitors, TV sets and so forth as having a reinforced glass sheet laminated on the outer surface of a typical synthetic resin substrate to thereby effectively protect an LCD panel from an external impact such as scratching, pressing or the like despite a great decrease in its thickness.
  • the LCD window according to the present invention has a merit that the
  • UV adhesive coating layer is distributed to a uniform thickness between the synthetic resin substrate and the reinforced glass sheet and no micro-bubbles remain within the UV adhesive coating layer to result in no change of the refractive index or transparency, and particularly no moirephenomenon occur.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)
  • Liquid Crystal (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The present invention provides an LCD window laminated with a reinforced glass sheet and method of manufacturing the same, and more particularly to, an LCD window in which a reinforced glass sheet is laminated on the outer surface of a typical synthetic resin substrate to thereby effectively protect an LCD panel from an external impact such as scratching, pressing or the like despite a great decrease in its thickness, and especially no micro-bubble remains in an adhesive layer formed between the synthetic resin substrate and the reinforced glass sheet, to thereby significantly improve transparency and adhesive strength, and a method of manufacturing the same.

Description

Description
LCD WINDOW LAMINATED WITH REINFORCED GLASS SHEET AND METHOD OF MAMUFACTURING THE SAME
Technical Field
[1] The present invention relates to an LCD window laminated with a reinforced glass sheet and method of manufacturing the same, and more particularly to, an LCD window in which a reinforced glass sheet is laminated on the outer surface of a typical synthetic resin substrate to thereby effectively protect an LCD panel from an external impact such as scratching, pressing or the like despite a great decrease in its thickness, and especially no micro-bubble remains in an adhesive layer formed between the synthetic resin substrate and the reinforced glass sheet, to thereby significantly improve transparency and adhesive strength, and a method of manufacturing the same. Background Art
[2] In general, as is well known in the art, an LCD stands for a liquid crystal display, and is configured such that a liquid crystal material is injected into a space between two glass substrates, i.e., two LCD panels. Thus, when an electrical pressure is applied between the liquid crystal material, arrangement of respective liquid crystal molecules is changed. At this time, a variety of characters or images are displayed on the LCD panel depending on a variation of the optical refractive index. Since such an LCD is typically driven with a power source of 1.5 to 2 V and has a very lower power consumption, it is widely used in PDAs, MP3s, computer monitors, TV sets and so forth.
[3] Meanwhile, an LCD window refers to a transparent protective window that is mounted on the outer surface of the LCD panel so as to protect the LCD panel from an external impact. This LCD window is mainly composed of a synthetic resin substrate containing a synthetic resin such as acryl resin, polycarbonate (PC), polyethylene terephthalate (PET), etc. Currently, along with the development of a digital industry, the technology relating to the LCD panel and the LCD window follow a trend toward slimness while various digital electronic devices are made more compact and slimmer.
[4] In line with this trend, conventionally, various researches have been attempted on development of an LCD window having a desired strength while the thickness of the substrate is made as thin as possible. For example, there has been developed an LCD window in which a sheet made of non-ferrous metal such as Al, Ni, Cu, Ti and the like is deposited on a synthetic resin substrate with a predetermined thickness to thereby reinforce a surface intensity of the substrate. However, such conventional LCD windows entail a problem in that when an external impact such as scratching, pressing or the like is applied thereto, there is a high risk that the surface of the LCD window may be impaired or marred. Particularly, there has been caused a problem in that a flexure is formed on the LCD window surface to cause a moir phenomenon to occur in which an interference fringe is created at the time of overlapping of two or periodic patterns.
[5]
Disclosure of Invention Technical Problem
[6] Accordingly, the present invention has been made in an effort to solve the aforementioned problems occurring in the prior art, and it is an object of the present invention to provide an LCD window in which a reinforced glass sheet is laminated on the outer surface of a typical synthetic resin substrate to thereby effectively protect an LCD panel from an external impact such as scratching, pressing or the like despite a great decrease in its thickness, no moire phenomenon occurs and especially no micro- bubble remains in an adhesive layer formed between the synthetic resin substrate and the reinforced glass sheet, to thereby significantly improve transparency and adhesive strength, and a method of manufacturing the same. Technical Solution
[7] To accomplish the above object, in one aspect of the present invention, there is provided an LCD window adapted to be mounted on the outer surface of an LCD panel to protect the LCD panel from an external impact, the LCD window comprising a synthetic resin substrate having a thickness of 20 to 500 D, a UV adhesive coating layer laminated on the synthetic resin substrate to a thickness of 5 to 100 D, and a reinforced glass sheet adhered to the UV adhesive coating layer to a thickness of 200 to 1000 D.
[8] Also, in another aspect of the present invention, there is provided a method of manufacturing an LCD window, comprising the steps of:
[9] providing a synthetic resin substrate having a thickness of 20 to 500 D and a thin sheet of glass having a thickness of 200 to 1000 D;
[10] coating a UV adhesive on at least one surface of the synthetic resin substrate or the thin sheet of glass to form a UV adhesive coating layer having a thickness of 5 to 100
□;
[11] disposing the synthetic resin substrate and the thin sheet of glass with the UV adhesive coating layer being sandwiched therebetween and compressing the synthetic resin substrate and the thin sheet of glass to each other so as to remove micro-bubbles within the UV adhesive coating layer; and
[12] irradiating an ultraviolet (UV) light of 5 to 900 mW onto the UV adhesive coating layer for 1 to 5 minutes to thereby cure the UV adhesive coating layer. Advantageous Effects
[13] It is expected that the LCD window according to the present invention will contribute to slimness of various digital electronic devices such as PDAs, MP3s, computer monitors, TV sets and so forth as having a reinforced glass sheet coated on the outer surface of a typical synthetic resin substrate to thereby effectively protect an LCD panel from an external impact such as scratching, pressing or the like despite a great decrease in its thickness.
[14] In addition, the LCD window according to the present invention has a merit that the
UV adhesive coating layer is distributed to a uniform thickness between the synthetic resin substrate and the reinforced glass sheet and no micro-bubbles remain within the UV adhesive coating layer to result in no change of the refractive index or transparency, and particularly no moire phenomenon occur.
[15]
Best Mode for Carrying Out the Invention
[16] Now, the present invention will be described hereinafter in more detail.
[17] The LCD window according to the present invention comprises a synthetic resin substrate having a thickness of 20 to 500 D, a UV adhesive coating layer laminated on the synthetic resin substrate to a thickness of 5 to 100 D, and a reinforced glass sheet adhered to the UV adhesive coating layer to a thickness of 200 to 1000 D.
[18] In the present invention, the synthetic resin substrate can employ whichever synthetic resin material used to manufacture a conventional LCD window, but preferably employs acryl resin, polycarbonate (PC), polyethylene terephthalate (PET), etc. The thickness of the synthetic resin substrate can be modified depending on the size of the LCD panel or the characteristics of an electronic device on which the LCD panel is mounted, but preferably is in a range between 20 to 500 D.
[19] In the present invention, a UV adhesive is used as an adhesive for mutually adhering the synthetic resin substrate and the reinforced glass sheet to each other so as to effectively adhere the synthetic resin substrate and the reinforced glass sheet whose materials are different from each other and to prevent bubbles from being generated within the UV adhesive coating layer. The UV adhesive is an anaerobic adhesive which is so-called an ultraviolet (UV) curing adhesive. Since this UV adhesive typically maintains a liquid phase prior to curing and allows an optically responsive initiator contained in the adhesive to initiate a reaction at the time of irradiation of an ultraviolet ray to the UV adhesive coating layer so that it is solidified in a short time, it is very suitable for the adhesion between the synthetic resin substrate and the reinforced glass sheet. In the present invention, the UV adhesive can use an acryl- based or epoxy-based UV adhesive. [20] The thickness of the UV adhesive coating layer is set to be in a range between 5 to
10OD. If the thickness of the UV adhesive coating layer is less than 5 D, the adhesion strength may be weakened. On the contrary, if the thickness of the UV adhesive coating layer is more than 100 D, there is no increase in the adhesion strength and rather an over flow phenomenon occurs where the adhesive layer material forcibly flow out from the reinforced glass sheet or micro-bubbles remain in the adhesive layer to adversely affect the transparency and the refractive index of the entire LCD window.
[21] Lastly, the reinforced glass sheet laminated on the UV adhesive coating layer is formed of a thin sheet of glass having a thickness of 200 to 1000 D. At this time, if the thickness of the thin sheet of glass is less than 200 D, the strength is so weakened that the thin sheet of glass may fail to sufficiently perform an intrinsic function of a reinforced sheet. On the contrary, if the thickness of the thin sheet of glass is more than 1000 D, the thickness of the entire LCD window is increased very greatly, undesirably leading to go against a slimness trend of the LCD.
[22] In the meantime, a method of manufacturing the LCD window according to the present invention will be described hereinafter in detail.
[23] First, a synthetic resin substrate having a thickness of 20 to 500 D and a thin sheet of glass having a thickness of 200 to 1000 D that are cut into a predetermined shape are provided. In this case, the synthetic resin substrate and the thin sheet of glass may be fabricated in the size and shape identical to each other, and the thin sheet of glass may be fabricated in the size and shape smaller than the synthetic resin substrate so that the thin sheet of glass can be adhered to only a part of the synthetic resin substrate.
[24] Next, a UV adhesive is coated on any one surface of the synthetic resin substrate or the thin sheet of glass, or both facing surfaces of the synthetic resin substrate and the thin sheet of glassto form a UV adhesive coating layer having a thickness of 5 to 100 D. At this time, the coating method may be performed such that the synthetic resin substrate or the thin sheet of glass is fixed on a jig inside a clean room, and then the UV adhesive is coated on the synthetic resin substrate or the thin sheet of glass by means of any one of silk screen coating, roll coating, etc., but preferably the UV adhesive is evenly coated on the synthetic resin substrate or the thin sheet of glass by means of silk screen coating using a rubber blade. A special attention must be paid so that the UV adhesive is not exposed to an ultraviolet ray in the course of coating the UV adhesive.
[25] Subsequently, after the synthetic resin substrate and the thin sheet of glass are disposed with the UV adhesive coating layer being sandwiched therebetween, the synthetic resin substrate and the thin sheet of glass are compressed to each other. At this time, an attention must be paid so that no micro-bubbles remain in the UV adhesive coating layer. If any micro-bubble remains in the UV adhesive coating layer, the UV adhesive is not coated and cured to a uniform thickness, thus causing the refractive index to be varied or a moir phenomenon to be occur in which an interference fringe is created at the time of overlapping of two or periodic patterns due to the constructive interference and the destructive interference of light. In addition, bubbles may be generated in the UV adhesive coating layer between the synthetic resin substrate and the thin sheet of glass to thereby deteriorate the adhesion strength or make an outer appearance defective.
[26] In the present invention, in order to address and solve such problems, the synthetic resin substrate and the thin sheet of glass are compressed to each other with the UV adhesive coating layer being sandwiched therebetween in a state where the inner pressure of a hermetically sealed space is reduced to 0.1 to 200 torr. If doing so, micro- bubbles are completely removed within the UV adhesive coating layer while the UV adhesive coating layer is diffused into a uniform thickness, and the synthetic resin substrate and the thin sheet of glass are closely adhered to each other. At this time, if the atmospheric pressure applied to the UV adhesive coating layer is more than 200 torr, there is a risk that the micro-bubbles may be completely not removed within the UV adhesive coating layer but residual bubbles may be generated in the UV adhesive coating layer.
[27] Lastly, an ultraviolet (UV) light is irradiated to the UV adhesive coating layer from which the micro-bubbles are completely removed to thereby cure the UV adhesive coating layer. At this time, the illuminance or the amount of energy of the UV ray varies depending on the thickness of the UV adhesive coating layer. Preferably, the ultraviolet (UV) light is irradiated to the UV adhesive coating layer with an illuminance of 5 to 900 mW for one to five minutes. Then, the UV adhesive coating layer is completely cured to thereby finish the LCD window according to the present invention.
Industrial Applicability
[28] It is expected that the LCD window according to the present invention will contribute to slimness of various digital electronic devices such as PDAs, MP3s, computer monitors, TV sets and so forth as having a reinforced glass sheet laminated on the outer surface of a typical synthetic resin substrate to thereby effectively protect an LCD panel from an external impact such as scratching, pressing or the like despite a great decrease in its thickness.
[29] In addition, the LCD window according to the present invention has a merit that the
UV adhesive coating layer is distributed to a uniform thickness between the synthetic resin substrate and the reinforced glass sheet and no micro-bubbles remain within the UV adhesive coating layer to result in no change of the refractive index or transparency, and particularly no moirephenomenon occur. [30] While the invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

Claims
[1] An LCD window adapted to be mounted on the outer surface of an LCD panel to protect the LCD panel from an external impact, the LCD window comprising a synthetic resin substrate having a thickness of 20 to 500 D, a UV adhesive coating layer laminated on the synthetic resin substrate to a thickness of 5 to 100 D, and a reinforced glass sheet adhered to the UV adhesive coating layer to a thickness of 200 to 1000 D.
[2] An LCD window of claim 1, wherein the UV adhesive coating layer is formed of an acryl-based or epoxy-based UV adhesive.
[3] A method of manufacturing an LCD window, comprising the steps of: providing a synthetic resin substrate having a thickness of 20 to 500 D and a thin sheet of glass having a thickness of 200 to 1000 D; coating a UV adhesive on at least one surface of the synthetic resin substrate or the thin sheet of glass to form a UV adhesive coating layer having a thickness of
5 to 100 D; disposing the synthetic resin substrate and the thin sheet of glass with the UV adhesive coating layer being sandwiched therebetween andcompressing the synthetic resin substrate and the thin sheet of glass to each other so as to remove micro-bubbles within the UV adhesive coating layer; and irradiating an ultraviolet (UV) light of 5 to 900 mW onto the UV adhesive coating layer for 1 to 5 minutes to thereby cure the UV adhesive coating layer.
[4] The method of claim 3, wherein the synthetic resin substrate and the thin sheet of glass are compressed to each other in a state where the inner pressure of a hermetically sealed space has been reduced to 0.1 to 200 torr so as to completely remove micro-bubbles within the UV adhesive coating layer.
PCT/KR2007/002118 2006-05-03 2007-04-30 Lcd window laminated with reinforced glass sheet and method of mamufacturing the same WO2007126281A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2006-0040097 2006-05-03
KR1020060040097A KR100643186B1 (en) 2006-05-03 2006-05-03 A lcd window covered with glass sheet and its preparation

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WO2007126281A1 true WO2007126281A1 (en) 2007-11-08

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Cited By (1)

* Cited by examiner, † Cited by third party
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WO2010076903A1 (en) * 2008-12-29 2010-07-08 Dug-Kyu Kim Touch screen window for applying to display panel such as lcd panel and method for preparing the same

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