US20110032456A1 - Display device - Google Patents

Display device Download PDF

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Publication number
US20110032456A1
US20110032456A1 US12/849,100 US84910010A US2011032456A1 US 20110032456 A1 US20110032456 A1 US 20110032456A1 US 84910010 A US84910010 A US 84910010A US 2011032456 A1 US2011032456 A1 US 2011032456A1
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United States
Prior art keywords
display device
glass substrate
resin film
adhesive
attached
Prior art date
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Abandoned
Application number
US12/849,100
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English (en)
Inventor
Yasushi Nakano
Hitoshi Azuma
Tomio Yaguchi
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.)
Panasonic Liquid Crystal Display Co Ltd
Japan Display Inc
Original Assignee
Hitachi Displays Ltd
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Filing date
Publication date
Application filed by Hitachi Displays Ltd filed Critical Hitachi Displays Ltd
Assigned to HITACHI DISPLAYS, LTD. reassignment HITACHI DISPLAYS, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AZUMA, HITOSHI, NAKANO, YASUSHI, YAGUCHI, TOMIO
Publication of US20110032456A1 publication Critical patent/US20110032456A1/en
Assigned to IPS ALPHA SUPPORT CO., LTD. reassignment IPS ALPHA SUPPORT CO., LTD. COMPANY SPLIT PLAN TRANSFERRING FIFTY (50) PERCENT SHARE IN PATENT APPLICATIONS Assignors: HITACHI DISPLAYS, LTD.
Assigned to PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD. reassignment PANASONIC LIQUID CRYSTAL DISPLAY CO., LTD. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: IPS ALPHA SUPPORT CO., LTD.
Priority to US13/859,860 priority Critical patent/US8755012B2/en
Assigned to Japan Display East, inc. reassignment Japan Display East, inc. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: HITACHI DISPLAYS, LTD
Assigned to JAPAN DISPLAY INC. reassignment JAPAN DISPLAY INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: Japan Display East, inc.
Abandoned 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/50—Protective arrangements
    • G02F2201/503—Arrangements improving the resistance to shock
    • 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
    • G02F2202/02—Materials and properties organic material
    • G02F2202/022—Materials and properties organic material polymeric
    • G02F2202/023—Materials and properties organic material polymeric curable

Definitions

  • the present invention relates to a display device, and in particular, to a display device of which the mechanical strength of a display panel, being vulnerable to impact, and using a thin glass substrate, on which a thin film transistor and a color film are formed, and a transferred thin film transistor layer, has been improved.
  • a display device which deforms flexibly by, after forming a functional element, such as a thin film transistor (TFT), on a glass substrate, removing the glass or reducing it into a thin film, and reattaching the functional element to a plastic substrate.
  • a functional element such as a thin film transistor (TFT)
  • TFT thin film transistor
  • a display device such as a liquid crystal display device or an organic EL display device, is not only configured of one substrate but, for example, as shown in FIG. 1 , with a display panel of the liquid crystal display device, as well as a glass substrate (GS (CF)) on which a color filter is formed being disposed opposed to a glass substrate (GS (TFT)) on which a thin film transistor (TFT) is formed, a seal member SE is disposed on the perimeter of the substrates, thus sealing a liquid crystal LC. Furthermore, a structure is such that polarizing plates PP 1 and PP 2 are attached to surfaces of the substrates with adhesives AD 1 and AD 2 respectively. Also, in the organic EL display device too, as in JP-A-2007-335365, a configuration is employed wherein polarizing plates are attached to a display panel.
  • a display device it is necessary that a plurality of plate-like bodies are layered one on another, causing a further increase in the thickness of a display panel configuring the display device. For this reason, it is necessary to still further reduce the thickness of a glass substrate and a plastic substrate, further weakening the mechanical strength of the display panel.
  • a display device having this kind of display panel is weakened in impact strength, which has become a major problem in a case of using the display device in an instrument, such as a portable telephone or a portable information terminal, which is highly likely to suffer a variety of impacts.
  • the invention has been made to solve the above-described problem, and therefore an object of the invention is to provide a display device with an increased impact strength which improves the mechanical strength of a display panel configuring a display device.
  • a display device has a thin film transistor or a color filter formed on a glass substrate, and a polarizing plate attached to the glass substrate with an adhesive, wherein a resin film having no viscosity or adhesion is disposed on the polarizing plate side surface of the glass substrate.
  • the polarizing plate is attached to the resin film with an adhesive.
  • a plastic substrate is attached to the resin film with an adhesive, and furthermore, the polarizing plate is attached to the plastic substrate with an adhesive.
  • the display device includes a display panel in which a thin film transistor is formed on the glass substrate, a color filter is formed on a plastic substrate, and the glass substrate and plastic substrate are disposed opposed to each other, wherein another plastic substrate is attached to the resin film of the glass substrate with an adhesive, and furthermore, the polarizing plate is attached to the other plastic substrate with an adhesive.
  • the resin film is formed in only an area close to the perimeter of the glass substrate.
  • the resin film is such that an ultraviolet curable or heat curable resin is applied as a coating, and thereafter, cured.
  • the retardation of the resin film is 5 nm or less.
  • the thickness of the resin film is 100 ⁇ m or less.
  • a display device has a thin film transistor layer, including a thin film transistor, provided on a glass substrate, the glass substrate being removed from the thin film transistor layer, and a polarizing plate being attached to the thin film transistor layer with an adhesive, wherein a resin film having no viscosity or adhesion is disposed on the polarizing plate side surface of the thin film transistor layer, a plastic substrate is attached to the resin film with an adhesive, and furthermore, the polarizing plate is attached to the plastic substrate with an adhesive.
  • the thickness of the glass substrate is 0.15 mm or less.
  • the thickness of the glass substrate is 0.05 mm or less.
  • the display device according to any one of the heretofore described aspects 1 to 11 is a liquid crystal display device.
  • the display device according to any one of the heretofore described aspects 1 to 3 or 6 to 8 is an organic EL display device.
  • the resin film, having no viscosity or adhesion being disposed on the polarizing plate side surface of the glass substrate, or on the polarizing plate side surface of the transferred thin film transistor layer, it is possible to improve the mechanical strength of the display panel, and, in particular, provide the display device with an increased impact strength.
  • FIG. 1 is a sectional view illustrating a structure of a liquid crystal display panel used in a heretofore known display device
  • FIG. 2 is a sectional view illustrating a structure of a liquid crystal display panel used in a display device of the invention
  • FIGS. 3A to 3D show a first embodiment illustrating a process of manufacturing a display panel used in the display device of the invention
  • FIGS. 4A to 4E show a second embodiment illustrating a process of manufacturing a display panel used in the display device of the invention
  • FIGS. 5A to 5E show a third embodiment illustrating a process of manufacturing a display panel used in the display device of the invention
  • FIGS. 6A to 6E show a fourth embodiment illustrating a process of manufacturing a display panel used in the display device of the invention.
  • FIG. 7 is a sectional view illustrating a structure of an organic EL display panel used in the display device of the invention.
  • FIGS. 8A to 8D show a fifth embodiment illustrating a process of manufacturing a display panel used in the display device of the invention.
  • FIG. 2 is a diagram showing one example of the structure of a liquid crystal display panel used in the display device of the invention.
  • the structure of the liquid crystal display panel is such that a glass substrate (GS (TFT)), on which a thin film transistor (TFT) is formed, and a glass substrate (GS (CF)), on which a color filter is formed, are disposed opposed to each other, a seal member SE is disposed on the perimeter of both substrates, and a liquid crystal LC is sealed inside.
  • GS glass substrate
  • GS glass substrate
  • GS glass substrate
  • a seal member SE is disposed on the perimeter of both substrates
  • a liquid crystal LC is sealed inside.
  • an electrode for applying an electric field to the liquid crystal, an oriented film for controlling the molecular orientation of the liquid crystal, and the like are provided on the glass substrate.
  • a power supply line for supplying power to the electrode, a signal line for applying a signal to a transistor which drives the electrode, and the like, are provided on the glass substrate on which the
  • a feature of the display device of the invention is that a resin film (RF 2 or RF 1 ) having no viscosity or adhesion is disposed on at least one glass substrate (GS (TFT) or GS (CF)).
  • GS glass substrate
  • CF GS
  • the resin film having no viscosity or adhesion, on the glass substrate, it is possible to easily form the resin film by coating the surface of the glass substrate with an ultraviolet curable or heat curable resin, and subsequently, carrying out an ultraviolet irradiation or an application of heat, thus curing the resin applied as a coating.
  • the resin film formed in this way covers the surface of the glass substrate, and is integrated with the glass substrate, but the surface of the resin film has no viscosity or adhesion. Also, as the thickness of the resin film is normally extremely small, on the order of several micrometers to several tens of micrometers, it will hardly cause an increase in thickness of the display panel but, as it is possible to adjust the thickness of the resin film by applying a thicker or additional coating of the resin, or the like, it is preferable to set the thickness of the resin film to 100 ⁇ m or less from the viewpoint of limiting the thickness of the display panel.
  • the resin film As a characteristic of the resin film is such that the resin film is disposed in the vicinity of pixels configuring the display panel, on the surface of the glass substrate, it is preferable that the retardation of the resin film is 5 nm or less. Because of this, it is possible to suppress any adverse effect such as image distortion.
  • the resin film (RF 1 or RF 2 ) shown in FIG. 2 is disposed over the entire surface of the glass substrate but, even when the resin film is disposed only in an area close to the perimeter of the glass substrate, a certain increase in mechanical strength can be expected.
  • a polarizing plate, another substrate (a plastic substrate), or the like is attached to the surface of the resin film using an adhesive, as will be described hereafter, even by simply disposing the resin film in a peripheral area, it is possible to increase the mechanical strength of the glass substrate to a strength close to a case in which the resin film is disposed over the entire surface of the glass substrate.
  • a polarizing plate (PP 1 or PP 2 ; the thickness of the polarizing plate is about 100 ⁇ m) is attached to the glass substrate (GS (CF) or GS (TFT)) by means of an adhesive (AD 1 or AD 2 ; the thickness of the adhesive is around 20 ⁇ m).
  • the display panel is configured by attaching a multilayer plate-like body in this way, as the resin film (RF 1 or RF 2 ) is thus disposed, it is possible to reduce the thickness of the glass substrate to 0.15 mm or less, and even to 0.05 mm or less, and it is possible to reduce the thickness of the whole of the display panel.
  • FIGS. 3A to 3D being a first embodiment relating to a display panel manufacturing process, illustrate steps of fabricating the display panel shown in FIG. 2 .
  • Step 1 a liquid crystal display cell (an LCD cell) using glass substrates is fabricated by a heretofore known method.
  • the thickness of the glass substrates is 0.5 mm, and the layer thickness of a liquid crystal LC between the substrates is around 4 ⁇ m.
  • a color filter and the like are formed on the glass substrate (GS (CF)), and a thin film transistor and the like are formed on the glass substrate (GS (TFT)).
  • Step 2 the thickness of the glass substrates is reduced to 0.15 mm by a mechanical polishing and/or an HF etching. Naturally, it is also possible to reduce the thickness of the glass substrates to 0.05 mm.
  • the thickness-reduced glass substrates are coated with an ultraviolet curable resin by a spin coat method, a slit coat method, or the like, and furthermore, the resin applied as a coating is cured by being irradiated with ultraviolet (UV).
  • UV ultraviolet
  • the thickness of the resin film can be set arbitrarily, it is possible to set it to a range of 0.5 ⁇ m to 100 ⁇ m. It is also possible to employ a heat curable resin in place of the ultraviolet curable resin.
  • Step 4 a polarizing plate (PP 1 or PP 2 ) with an adhesive (AD 1 or AD 2 ) is attached to a surface of the resin film (RF 1 or RF 2 ).
  • FIGS. 4A to 4E being a second embodiment relating to the display panel manufacturing process, illustrate steps of fabricating a liquid crystal display panel with a plastic substrate attached on either side of the liquid crystal display cell.
  • Steps 1 to 3 of FIG. 4A to 4C are the same as Steps 1 to 3 of FIG. 3A to 3C .
  • Step 4 a surface of the resin film (RF 1 or RF 2 ) is coated with an adhesive (AD 1 or AD 2 ), and a plastic substrate (0.1 mm thick; PL 1 or PL 2 ) is attached thereto.
  • Step 5 a polarizing plate (PP 1 or PP 2 ) with an adhesive (AD 3 or AD 4 ) is attached to a surface of the plastic substrate (PL 1 or PL 2 ).
  • FIGS. 5A to 5E being a third embodiment relating to a display panel manufacturing process, illustrate steps of fabricating a liquid crystal display panel in which a liquid crystal display cell is configured of substrates of different materials, a glass substrate and a plastic substrate, wherein another plastic substrate is attached on the glass substrate side.
  • Step 1 a color filter is formed on a 0.1 mm thick plastic substrate (PL (CF)), a thin film transistor (TFT) is formed on a 0.5 mm thick glass substrate (GS (TFT)) and, as well as both of them being attached to each other, a seal member SE is disposed between both substrates, and a liquid crystal LC is sealed inside, fabricating a liquid crystal display cell.
  • the layer thickness of the liquid crystal LC between the substrate is around 4 ⁇ m.
  • Step 2 the thickness of the glass substrate on which the TFT is formed is reduced to 0.15 mm by a mechanical polishing and/or an HF etching. Naturally, it is also possible to reduce the thickness of the glass substrate to 0.05 mm.
  • the thickness-reduced glass substrate (GS (TFT)) is coated with an ultraviolet curable resin by a spin coat method, a slit coat method, or the like, and furthermore, the resin film (RF 3 ) applied as a coating is cured by being irradiated with ultraviolet (UV).
  • UV ultraviolet
  • the thickness of the resin film can be set arbitrarily, it is possible to set it to a range of 0.5 ⁇ m to 100 ⁇ m.
  • a heat curable resin in place of the ultraviolet curable resin, but a resin is used which has a range of curing temperature in which it does not happen that the plastic substrate (PL (CF)) is deformed, or that the light transmittivity thereof deteriorates, due to the application of heat during the curing.
  • Step 4 a surface of a resin film (RF 3 ) is coated with an adhesive (AD 5 ), and a plastic substrate (0.1 mm thick; PL 3 ) is attached thereto.
  • Step 5 a polarizing plate (PP 1 or PP 2 ) with an adhesive (AD 6 or AD 7 ) is attached to a surface of the plastic substrate (PL (CF) or PL 3 ).
  • FIGS. 6A to 6E being a fourth embodiment relating to a display panel manufacturing process, illustrate steps of fabricating a liquid crystal display panel, being a liquid crystal display cell having a liquid crystal layer between a thin film transistor layer (TFTL) remaining after a glass substrate has been removed partway through and a plastic substrate, in which another plastic substrate is attached to the thin film transistor layer.
  • TFTL thin film transistor layer
  • Step 1 a color filter is formed on a 0.1 mm thick plastic substrate (PL (CF)), a thin film transistor layer (TFTL) is formed on a 0.5 mm thick glass substrate (GS) and, as well as both of them being attached to each other, a seal member SE is disposed between both substrates, and a liquid crystal LC is sealed inside, fabricating the liquid crystal display cell.
  • the layer thickness of the liquid crystal LC between the substrate is around 4 ⁇ m.
  • Step 2 the glass substrate holding the TFT layer is removed by a mechanical polishing and/or an HF etching, or a transfer method.
  • a surface of the TFT layer (TFTL) is coated with an ultraviolet curable resin by a spin coat method, a slit coat method, or the like, and furthermore, the resin film (RF 4 ) applied as a coating is cured by being irradiated with ultraviolet (UV).
  • UV ultraviolet
  • the thickness of the resin film can be set arbitrarily, it is possible to set it to a range of 0.5 ⁇ m to 100 ⁇ m.
  • a heat curable resin in place of the ultraviolet curable resin, but a resin is used which has a range of curing temperature in which it does not happen that the plastic substrate (PL (CF)) is deformed, or that the light transmittivity thereof deteriorates, due to the application of heat during the curing.
  • Step 4 a surface of the resin film (RF 4 ) is coated with an adhesive (AD 8 ), and a plastic substrate ( 0 . 1 mm thick; PL 4 ) is attached thereto.
  • Step 5 a polarizing plate (PP 1 or PP 2 ) with an adhesive (AD 9 or AD 10 ) is attached to a surface of the plastic substrate (PL (CF) or PL 4 ).
  • a display panel of the organic EL display device shown in FIG. 7 is such that a TFT layer (0.5 to 3 ⁇ m in layer thickness; TFTL) provided with a thin film transistor (TFT) circuit and the like, an organic EL layer (0.5 to 3 ⁇ m in layer thickness; OELL) forming a light emitting layer, and the like, are formed and disposed on a surface of a glass substrate (GS 2 ). Then, a light emitting portion including the light emitting layer is hermetically sealed with a glass substrate (GS 1 ), which is an opposed substrate, and a seal member SE. Also, a space between the two glass substrates (GS 1 and GS 2 ) is filled with an adhesive AD, more closely attaching both of them to each other.
  • Step 1 an organic EL cell using glass substrates (each of which has a thickness of 0.5 mm) is fabricated by a heretofore known method.
  • a thin film transistor which carries out a drive control of the light emitting portion, a light emitting layer, and the like, are formed on the lower glass substrate (GS (TFT)).
  • the thickness of the organic EL layer (OELL) formed between the two glass substrates is on the order of about 10 ⁇ m.
  • Step 2 the thickness of the two glass substrates is reduced to 0.15 mm by a mechanical polishing and/or an HF etching. It is also possible to reduce the thickness to, more preferably, 0.05 mm or less.
  • Step 3 a surface of each glass substrate is coated with an ultraviolet curable resin by a spin coat method, a slit coat method, or the like, and furthermore, the resin film (RF 1 , RF 2 ) applied as a coating is cured by being irradiated with ultraviolet (UV).
  • UV ultraviolet
  • the thickness of the resin film can be set arbitrarily, it is possible to set it to a range of 0.5 ⁇ m to 100 ⁇ m. It is also possible to employ a heat curable resin in place of the ultraviolet curable resin, but a resin is used which has a range of curing temperature in which the application of heat during the curing does not cause thermal damage to the organic EL layer, and the like.
  • Step 4 a polarizing plate PP with an adhesive (AD) is attached to a surface of one resin film (RF 1 ), thereby completing the display panel of the organic EL display device.
  • resin films (RF 1 and RF 2 ) function effectively.
  • the invention it is possible to improve the mechanical strength of the display panel configuring the display device, and provide a display device with an increased impact strength.

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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)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
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JP2009181247A JP5399805B2 (ja) 2009-08-04 2009-08-04 表示装置

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US20120104938A1 (en) * 2010-10-29 2012-05-03 Chang-Woong Chu Organic light emitting diode display
CN103682156A (zh) * 2013-12-10 2014-03-26 京东方科技集团股份有限公司 一种有机电致发光显示器件及显示装置
US20140267974A1 (en) * 2013-03-12 2014-09-18 Mitsubishi Electric Corporation Display apparatus
CN104662075A (zh) * 2012-09-28 2015-05-27 富士胶片株式会社 纤维素酰化物膜、偏振片及液晶显示装置

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JP2013104969A (ja) * 2011-11-11 2013-05-30 Japan Display West Co Ltd 表示装置
KR20150102133A (ko) 2014-02-27 2015-09-07 삼성디스플레이 주식회사 표시 패널, 이를 포함하는 표시 장치 및 이의 제조 방법

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