CN103838023A - Display device and making method thereof - Google Patents
Display device and making method thereof Download PDFInfo
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- CN103838023A CN103838023A CN201310611465.6A CN201310611465A CN103838023A CN 103838023 A CN103838023 A CN 103838023A CN 201310611465 A CN201310611465 A CN 201310611465A CN 103838023 A CN103838023 A CN 103838023A
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Abstract
The invention provides a technology capable of stopping/preventing contraction damages of parts (polarization elements), and the damages are caused by light irradiation influence used for light solidification carried out for a light solidification bonding agent; in a making method of a display with a structure formed by attaching a display panel with a transparent cover through the light solidification bonding agent (8), the proportion of light absorbency based on wavelength of polymerization initiator (81) contained by the light solidification bonding agent (8) is listed in the following mode: when the light absorbency of wavelength 365nm is 1, the light absorbency of the wavelength 405nm=1: (0.25-0.5).
Description
Technical field
The present invention relates to the technology of display device and bonding agent etc.
Background technology
The display device forming as using bonding agent by parts laminatings, has much the display device that the surface label of transparency cover or touch panel (or also referred to as touch sensor etc.) etc. is combined in to the surface of display panel and form.For example there is liquid crystal indicator (referred to as LCD) comprising display panels etc.For example utilize bonding agent transparency cover to be fitted in to whole of viewing area of flat panel.
In observer's side (front face side) of LCD panel, mostly dispose the transparency cover being formed by such as tempered glass or acryl resin etc.This transparency cover is the layer with the effect of cover sheet etc.As other effects (function), can enumerate that optical filter (transmissivity adjustment and reflection suppress etc.), static prevent etc.
In addition, in recent years, be accompanied by the multifunction of portable telephone terminal and plate personal computer etc., above-mentioned transparency cover layer be replaced by touch panel (touch sensor) layer structure also a lot.The portable terminal that is much equipped with liquid crystal touch panel is for example provided.In addition,, as touch panel, there are resistive film mode, ultrasound wave mode, electrostatic capacitance mode etc.
As the bonding agent of the laminating use of above-mentioned parts, there are light-cured type bonding agent, transparent adhesive sheet, by silicon gel and silicon rubber lamination and sheet obtaining etc.Particularly, recently, be mostly used as the light-cured type bonding agent of the type that light such as utilizing ultraviolet ray (UV) is cured.
Above-mentioned transparency cover, according to the function of the regulation of this transparency cover, is configured in apart from the position of panel surface predetermined distance by bonding agent.Therefore, there is the situation that has air layer between transparency cover surface and panel surface.In this case, with the interface of air layer, due to its refringence, can produce unwanted boundary reflection, become the main cause of display comparison degree reduction etc.
Transparency cover being fitted in the structure of panel surface, as the means of the above-mentioned air layer of reply, use following structure: the refractive index of adjusting adhesive linkage with transparent adhesive linkages such as above-mentioned light-cured type bonding agent or transparent adhesive sheets.That is, adjust, make the refractive index of adhesive linkage identical with the refractive index of transparency cover.
As the means of the laminating of above-mentioned parts, in the case of the sheet components such as the sheet that uses transparent adhesive sheet, silicon gel and silicon rubber lamination are obtained, when bonding, only there is for example thickness of about 6 one-tenth of this sheet thickness to deform, therefore, have the situation that produces bubble in adhesive portion.For example, there is following situation: in the module of this display device, implemented the part (lid) of printing of thickness of hundreds of μ m left and right for the appearance design of periphery, have step in this Printing Department.In the case of utilize the parts of above-mentioned sheet carry out bonding, have the problem in the manufacture that can not absorb this step completely and produce bubble.Therefore, do not use above-mentioned transparent adhesive sheet etc. and use the manufacture method of light-cured type bonding agent becoming main flow.
Means at use light-cured type bonding agent for example, as the laminating of above-mentioned parts (LCD panel and transparency cover), the overview of manufacturing process (bonding process) for example becomes following.(1) at the surperficial adhesive-applying (light-cured type bonding agent) of panel or transparency cover.(2) configure relative with transparency cover panel towards the mode of inner side with the applicator surface of above-mentioned bonding agent, both are close gradually, carry out overlapping (lamination) and make to become the state that applicator surface contacts with another side.In addition,, in this moment, bonding agent is uncured state.(3) from transparency cover side, to the parts after above-mentioned lamination (panel, bonding agent, transparency cover), from light source irradiation light., by make bonding agent solidify to light-cured type bonding agent irradiation light, parts are bonded to each other.In this moment, bonding agent is for solidifying and pellucidity.
As light source and the irradiation unit of the curing use of above-mentioned light-cured type bonding agent, mostly use typically high-pressure mercury UV-lamp (being also suitably called below " Halogen lamp LED ") and ultraviolet lamp.Corresponding light-cured type bonding agent is also referred to as ultraviolet ray (UV) curing type bonding agent.
High-pressure mercury UV-lamp has predominant wavelength (aftermentioned Fig. 7) at wavelength 365nm.Therefore, light-cured type bonding agent preferably uses mainly and near wavelength 365nm, has the light-cured type bonding agent of high sensitivity or absorbance (being combined with near the light-cured type bonding agent of polymerization initiator wavelength 365nm with high sensitivity or absorbance).
In addition, state in the use in the operation of parts overlapping (lamination) of light-cured type bonding agent, need to prevent later abnormal of lamination, the sneaking into etc. of residual, the small foreign matter of such as bubble, abnormal for this, the in the situation that of discovery before bonding agent solidifies, can process.That is, panel and transparency cover can be peeled off, the bonding agent that comprises above-mentioned abnormal state is removed for the time being.Then, adhesive-applying between panel and transparency cover again, (rework) reforms.
About the display device that uses above-mentioned bonding agent that parts laminating is formed, as the example of prior art, there are TOHKEMY 2009-93200 communique (patent documentation 1), TOHKEMY 2008-216543 communique (patent documentation 2) etc.
Patent documentation 1(" display device " etc.) record " raising of the intensity that can realize touch panel is provided and can realizes the display device of the slimming of display device ... " etc.In patent documentation 1, record and utilize resin filling materials (the transparent resin packing material that polymer resin composition irradiation ultraviolet radiation is cured) by display panels and touch panel laminating.
Patent documentation 2(" with the Organnic electroluminescent device of input function ") record " organic El device with input function that can obtain high accuracy of detection, high-performance and high reliability is provided ... " etc.In addition, in patent documentation 2, record that " device substrate 11 and hermetic sealing substrate 12 are fitted by sealing resin 13.Above-mentioned sealing resin 13 is formed by heat reactive resin or ultraviolet curable resin etc.. " etc.In patent documentation 2, also record touch panel and ultraviolet curable resin etc.
Prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2009-93200 communique
Patent documentation 2: TOHKEMY 2008-216543 communique
Summary of the invention
The technical matters that invention will solve
As mentioned above, for the display device of utilizing light-cured type bonding agent that the surface laminating of the layer of surface and transparency cover or the touch panel etc. of the panel of LCD etc. is formed, in the solidifying of light-cured type bonding agent after parts overlapping (lamination), use high-pressure mercury UV-lamp etc. as light source and irradiation unit.Above-mentioned Halogen lamp LED has predominant wavelength at wavelength 365nm.
On the other hand, in the situation that display device is LCD, at the front-back of LCD panel, be provided with the polarization plates as light polarization plate.Polarization plates is for example following structure: the polaroid of polyvinyl alcohol (PVA) (PVA) the film formation that will be stretched by absorption iodine (I), utilize triacetyl cellulose (Triafol T) (TAC) film protect from two sides.That is, be provided with TAC film as protective seam, the PVA film as polaroid that protection is easily shunk due to the ultraviolet ray from outside or humidity.
Use UV curing type bonding agent by the module of the structure that comprises the laminating such as LCD panel and transparency cover of above-mentioned polarization plates and form in the case of manufacturing, due to the irradiation of the light that comprises UV solidifying for bonding agent, this light is also irradiated to polarization plates by bonding agent.Thus, polarization plates self absorbs UV and shrinks.Particularly PVA layer absorbs (transmission) the UV composition of failing to be absorbed/covered by TAC layer and shrinks.,, as the damage being caused by the contraction of this polarization plates (being mainly PVA layer), produce the skew of the polarization axle of polaroid.Thus, the technical matters that has the display quality that causes LCD to reduce.
About above-mentioned technical matters, Fig. 8 represents the absorbance by wavelength of the LCD polarization plates of structure in the past to measure and the figure that obtains.Absorbance is herein the value of whole polarization plates.As shown in the figure, known polarization plates is near wavelength 400nm, (the line a) degree of the absorption of following light is high.
In addition, absorbance is the characteristic of the degree of weakened while representing that light passes through object, is to get the common logarithm of transmissivity and give negative sign and the value that obtains.Absorbance: A=-log(I/Io), I: transmitted intensity, Io: incident intensity.
In view of above situation, fundamental purpose of the present invention is to provide following technology: the display device forming about using bonding agent by parts (display panel and transparency cover etc.) laminatings, contraction equivalent damage that can prevent from/suppress being caused by the light-struck impact for photocuring that light-cured type bonding agent is carried out, component side elements such as () polarization plates.
For the means of technical solution problem
In order to achieve the above object, in the present invention, representational mode is display device, its manufacture method and the bonding agent etc. that use bonding agent that parts (display panel and transparency cover etc.) laminating is formed, and it is characterized in that having formation shown below.
(1) the manner is to use bonding agent that display panel and transparency cover are fitted and the display device of formation, above-mentioned bonding agent is the light-cured type bonding agent that comprises polymerization initiator, in the case of near the first wavelength of the light irradiation of the photocuring for above-mentioned bonding agent is 365nm and second wave length be near 405nm, above-mentioned polymerization initiator is the absorbance of the first wavelength in the ratio of the absorbance of wavelength: absorbance=1:(0.25～0.5 of second wave length).
(2) further, in the case of near the three-wavelength of the light irradiation of the photocuring for above-mentioned bonding agent is 435nm, above-mentioned polymerization initiator is the absorbance of the first wavelength in the ratio of the absorbance of wavelength: absorbance=1:(0～0.1 of three-wavelength).
(3) above-mentioned bonding agent comprises by above-mentioned polymerization initiator and causes and the monomer of polymerization and oligomer energetically.
Invention effect
Representational mode according to the present invention, the display device forming about using bonding agent by parts (display panel and transparency cover etc.) laminatings, contraction equivalent damage that can prevent from/suppress being caused by the light-struck impact for photocuring that light-cured type bonding agent is carried out, component side elements such as () polarization plates.Thus, for example can prevent/suppress the deteriorated of display quality that skew by the polarization axle of the elements such as polarization plates etc. causes.
Brief description of the drawings
Fig. 1 is the figure of the cross section structure of the major part of the display device (LCD module) that represents an embodiment of the invention.
Fig. 2 is the figure of the structure of (separation) before each parts bonding of the display device of presentation graphs 1.
Fig. 3 is the figure of the irradiation of the light (UV) that roughly represents that light-cured type bonding agent to present embodiment and polarization plates (amplification) carry out.
Fig. 4 is the figure that represents the manufacturing process of the manufacture method of the display device of an embodiment of the invention.
Fig. 5 is the figure that represents constituent and properties of the light-cured type bonding agent of present embodiment etc.
Fig. 6 is the figure that represents near relation of each wavelength of of the borderline region of visible ray and UV etc.
Fig. 7 is the key diagram of the summary situation (predominant wavelength etc.) of the spectral distribution of the example (high-pressure mercury UV-lamp) that represents light source.
Fig. 8 represents the figure of the determination data of the absorbance of the LCD polarization plates of structure in the past.
Fig. 9 is the figure that roughly represents the example of the light-struck mode in the manufacture method of display device of embodiment 2.
Embodiment
Below, with reference to the accompanying drawings embodiments of the present invention are elaborated.In addition,, at the institute's drawings attached for embodiment is described, for same section, mark in principle same-sign and omit its repeat specification.In addition, in the accompanying drawings, to represent in order holding intelligibly, suitably to omit cross section shade etc., emphasize that major part represents, comprise the situation that actual size, ratio etc. are different.In addition, in this manual, term " operation " not only comprises the independently situation of operation, and in the situation that this operation can not be distinguished clearly with other operations, as long as can reach the set goal of this operation, is just also contained in this term " operation ".In addition, in explanation, direction in the face corresponding with panel picture is made as to X-Y direction, perpendicular direction is made as to Z direction.
The > such as < summary
The display device of the manner is following structure: use light-cured type bonding agent, using the face of panel, for example, as the face of face and the transparency cover etc. of the polarization plates of the inscape (or the key element being connected with panel) of panel fit (bonding).In addition, in the manufacture method of the display device of the manner, there is following manufacturing process: use light-cured type bonding agent, using the face of panel, for example, as the face laminating of face and the transparency cover etc. of the polarization plates of the inscape of panel.In addition, above-mentioned transparency cover can be transparent panel or the hyaline layer mainly being formed by glass or organic glass etc., can be also transparent touch panel or touch sensor layer etc.In the situation that being touch panel layer, for example, comprise transparency electrode being formed by ITO etc. etc.
In said structure and manufacturing process, bonding agent (light-cured type bonding agent) comprises: polymerization initiator, about the absorbance of this polymerization initiator, in the time establishing the first wavelength (w1)=365nm and second wave length (w2)=405nm, the ratio of the absorbance of the first wavelength and second wave length or ratio are w1(365nm) absorbance: w2(405nm) absorbance=1:(0.25～0.5); The monomer of polymerization and oligomer energetically with being caused by this polymerization initiator.
For example, above-mentioned bonding agent comprises: the ratio of absorbance is wavelength 365nm(w1) absorbance: wavelength 405nm(w2) the polymerization initiator of absorbance=1:0.5; The monomer of polymerization and oligomer energetically with being caused by this polymerization initiator.
In addition, in this manual, the numerical range that above-mentioned use "～" represents as " a～b ", represents that the numerical value (a, b) of the front and back record that is included in "～" is as minimum value and peaked scope (a≤X≤b) (arbitrary value that X is this scope).For example, in the absorbance of w1: absorbance=1:0.5 of w2, represent that the degree of the extinction of w2=405nm is 1/2 with respect to the degree of the extinction of w1=365nm.
The meaning of the numerical value of the condition of above-mentioned bonding agent as described below.In the past, in the absorbance of absorbance at w1: w2, the absorbance of w1 is large, the absorbance little (absorbance=1:(0～0.1 of the absorbance of w1: w2) of w2), but in the present invention and embodiment, with respect to the absorbance of w1, make the absorbance of w2 increase (absorbance=1:(of the absorbance of w1: w2 is than 0.1 large value)).Thus, the curing needed irradiation time of bonding agent or exposure reduce.Thus, (total) irradiation time or the exposure that are irradiated to polarization plates reduce, and can suppress the damage of shrinking.
Above-mentioned the first wavelength (w1)=365nm, corresponding to this fundamental purpose of photocuring of bonding agent, select corresponding to the characteristic of the predominant wavelength of Halogen lamp LED as light-struck light source etc.In addition, the polarization plates as mentioned above absorbance below the about 400nm of wavelength is high, therefore, by the layer that utilizes bonding agent, the composition below the about 400nm of wavelength is carried out to extinction, can prevent/suppress the impact on elements such as polarization plates.
Above-mentioned second wave length (w2)=405nm, the affecting this purpose, select corresponding to the characteristic of the commplementary wave length of light source elements such as polarization plates of promptly carrying out preventing/suppress being caused by the irradiation composition that sees through bonding agent corresponding to the photocuring that makes bonding agent.
With regard to the lower limit 0.25 of the scope of the absorbance of the w2 of aforementioned proportion, as the absorbance that occurs photocuring reaction by the light of illumination wavelength w2, bottom line needs more than 0.2, therefore, consider nargin, selects 0.25 as lower limit.
The higher limit 0.5 of the scope of the absorbance of the w2 of aforementioned proportion, corresponding to manufacturing at present/higher limit of the absorbance of the w2 of commercially available light-cured type bonding agent/polymerization initiator selects.
In addition, in said structure and manufacturing process, with regard to bonding agent (light-cured type bonding agent), about its absorbance, in the time establishing the first wavelength (w1)=365nm, second wave length (w2)=405nm and three-wavelength (w3)=435nm, the absorbance that makes the more than three-wavelength wavelength is abundant little value.The ratio or the ratio that for example comprise the absorbance of the first wavelength and three-wavelength are w1(365nm) absorbance: w3(435nm) absorbance=1:(0～0.1) polymerization initiator.Thus, bonding agent is reduced in the degree of visible region reaction (extinction), the easiness of manufacturing process and the transparency are improved.
In addition, especially, the manufacture method of above-mentioned display device has following operation: under the state of overlapping (laminations) such as above-mentioned panel (polarization plates), light-cured type bonding agent and transparency covers, above-mentioned bonding agent irradiation is comprised to ultraviolet light and fit.Thus, bonding agent (its polymerization initiator) absorbs the light of the first wavelength (w1) in light irradiation efficiently, causes/promote the reaction of photocuring.And bonding agent (its polymerization initiator) absorbs the light of the second wave length (w2) in light irradiation with the ratio that is in a ratio of 1/4～1/2 left and right with the light of the first wavelength (w1).Thus, the reaction of the photocuring of bonding agent is further promoted (carrying out rapidly), solidifies needed time shorten, for bonding compared with the past the tailing off of total irradiation time/exposure.Total irradiation time/exposure that (transmission) light irradiation of thus, failing to be absorbed/covered by bonding agent is irradiated to the polarization plates of panel etc. reduces.Thus, can suppress the impact (damage being caused by contraction) of the polarization plates etc. of counter plate.That is, the deteriorated of skew of the polarization axle of polarization plates etc. can be prevented/suppress, display quality can be guaranteed.
< embodiment 1 >
Use Fig. 1～Fig. 8, display device and the manufacture method etc. thereof of embodiments of the present invention 1 are described.
[display device (LCD)]
Fig. 1 represents that LCD(as the display device of present embodiment is also referred to as LCD module) 10 cross section structure, represent the state after parts laminating.In addition, as cross sectional shape, substantially same with LCD in the past, each size and the ratio etc. of actual installation can suitably design.
Display device (LCD) 10 is that LCD panel 9 and transparency cover 7 pass through the bonding structure of bonding agent (light-cured type bonding agent) 8, and this LCD panel 9 comprises polarization plates 4,5.The basic structure of LCD panel 9 is: have first substrate 1 and the second substrate 2 of relative configuration, the structure of fitting by seal 3 in the mode of clamping, sealing liquid crystal layer 6 between these substrates (1,2).First substrate 1 and second substrate 2 for example comprise the transparent substrate assembly of the insulativity being made up of glass or organic glass (acryl resin or polycarbonate) etc.The first substrate 1 of rear side is to be formed with TFT(thin film transistor (TFT)) etc. tft array substrate.The second substrate 2 of front face side is observer's side, is the CF substrate that is formed with colored filter (CF) etc.Seal 3 is formed on the periphery (or frame portion) in the outside of the viewing area (picture) of LCD panel 9 in plan view (X-Y) to surround the mode of liquid crystal layer 6.
Lateral surface at the substrate (1,2) of the front and back of LCD panel 9 is provided with polarization plates (4,5).That is, on the first substrate 1 of side, be connected with the first polarization plates 4 overleaf, on the second substrate 2 of front face side, be connected with the second polarization plates 5.The face of transparency cover 7 is fitted in by bonding agent 8 on the face of polarization plates 5 of the front face side of LCD panel 9.
Fig. 2 represents the structure of the separation (before bonding) of each portion (LCD panel 9, transparency cover 7, bonding agent 8) of display device corresponding with Fig. 1, present embodiment (LCD) 10.The face f1 of the polarization plates 5 of LCD panel 9 and the face f4 of transparency cover 7 are by bonding agent 8(joint face f2, f3) bonding.It is for example whole corresponding with viewing area by face f1, the f4 of bonding (laminating).
[transparency cover]
The material that transparency cover 7 for example has a transparency (visible light transmission) by glass or acryl resin etc. forms, and performance is as the effect of the damaged over cap for preventing LCD panel 9 with as the effect of the tint correction plate (optical filter) of whole display device 10 etc.In addition, can make it have the function of the regulations such as static preventing layer.The thickness of the Z direction of transparency cover 7 is not particularly limited, for example, be preferably 0.5～2.5mm, is 1.6mm in the present example.
As other embodiments, also can be for above-mentioned transparency cover 7 being replaced with to the mode of transparent touch panel (or touch sensor) layer etc.
[to the irradiation of bonding agent and polarization plates]
Fig. 3 roughly represents irradiation (UV irradiation) and the structure example of polarization plates 5 etc. of the light-cured type bonding agent 8 of the display device 10 to present embodiment.Irradiation unit 300 comprises that for example high-pressure mercury UV-lamp is as light source.During fabrication, the bonding agent 8 of the state of the each several part lamination of the bonding agent 8(Fig. 2 to LCD10 from irradiation unit 300) irradiate comprise UV light.Bonding agent 8 utilizes the light irradiation that comprises UV to carry out photocuring and bonding.The light irradiation that comprises UV is not only irradiated to bonding agent 8, is also irradiated to polarization plates 5 through bonding agent 8.
Polarization plates 5 is for example following structure: taking the PVA(polyvinyl alcohol (PVA) as polaroid) layer (PVA layer 52) of film is as main body, at its front-back lamination/be fitted with TAC(triacetyl cellulose as protective seam) film etc. layer (TAC layer 51,53).
TAC layer (51,53) is as the protective seam setting that the above-mentioned PVA layer 52 easily shrinking due to UV or humidity is protected., TAC layer (51,53), has following about UV(wavelength 400nm matchingly with the characteristic of PVA layer 52) absorb or the character of blocking etc.TAC layer (51,53), the thickness of Z direction is larger, higher to the protective value of PVA layer 52.On the other hand, have the requirement/trend of module slimming, in the case of correspondingly making the thickness of Z direction of polarization plates 5 or its TAC layer (51,53) reduces, above-mentioned protective value reduces.
In addition, also have in LCD panel 9 as the protective seam of the outermost of polarization plates 5 PET(polyethylene terephthalate be set) situation of layer etc., but do not arrange in the present embodiment.
[manufacture method of display device]
Fig. 4 represents the technique summary of the manufacture method of the display device (LCD) 10 of embodiment 1.S1 etc. represent step or operation.In addition, about the formation of the bonding agent 8 using, will be explained below.
In S1, the part except polarization plates 4,5 (1,2,3) of the LCD panel 9 of manufacture or set-up dirgram 2.
In S2, manufacture or prepare polarization plates 4,5.Polarization plates 5 is for example the structure of Fig. 3.
In S3, the polarization plates 4,5 of S2 is installed at the front-back of the LCD of S1 panel 9.Obtain the LCD panel 9 of for example Fig. 2.
In S4, the transparency cover 7 of manufacture or set-up dirgram 2.In the situation that replacing transparency cover 7 to connect touch panel layer, manufacture or prepare touch panel layer.
In S5, manufacture or prepare light-cured type bonding agent 8.Details as shown in Figure 5.In addition, can be by the mixing such as bonding agent of more than two kinds and polymerization initiator etc. be made to this bonding agent 8 in S5.
In S10, use the LCD panel 9(of S3 with polarization plates 4,5), the transparency cover 7 of S4 and the light-cured type bonding agent 8 of S5, as shown in Figure 2, utilize light-cured type bonding agent 8 by the face f4 laminating of the face f1 of the polarization plates of LCD panel 95 and transparency cover 7/bonding.The operation of S10 for example has the second operation of the first operation shown below, S11, S12 and the 3rd operation of S13.
As the first operation of S11, the face coating light-cured type bonding agent 8 that becomes inner side in the time of LCD panel 9 configuration relative with transparency cover 7.In the present example, there is the whole face at the face f4(of transparency cover 7) operation of adhesive-applying 8.As the mode of coating, use divider (dispenser), the coating of slit-type squash type (slot die coating), slit coating (slit coating), serigraphy etc.Use in the present example slit coating mode, the face f4 of transparency cover 7 with the even thickness of for example 200 μ m be stratiform adhesive-applying 8.The operation of the face f1 adhesive-applying 8 that in addition, S11 also can replace at LCD panel 9.
As the second operation of S12, in vacuo (being in vacuum plant), mode with the applicator surface (f2) of the bonding agent 8 of the transparency cover 7 of S11 towards inner side, the face f1 relative configuration spaced apart by the applicator surface of the bonding agent of transparency cover 78 (f2) with the polarization plates 5 of LCD panel 9.Regulation vacuum tightness, make they Z direction gradually near and approach, carry out overlapping (lamination) and make both faces (f1, f2) become the state of contact.In addition,, in this moment, bonding agent 8 is uncured state.Keep certain hour at this layer-by-layer state, then remove hold mode, carry out atmosphere opening.In addition,, by atmosphere opening, there is the effect that prevents/eliminate bubble.Overlapping/lamination there is is the LCD panel 9 of the state of transparency cover 7 take out.
As the 3rd operation of S13, use above-mentioned irradiation unit 300(light source: high-pressure mercury UV-lamp), to S12 overlapping/lamination has the LCD panel 9 of the state of transparency cover 7, irradiates from the Z direction of the front face side of transparency cover 7 light that comprises UV, makes thus bonding agent 8 photocurings.Light quantity (for example 3000mJ/cm specifying by irradiation
2), make bonding agent 8 solidify (bonding) completely.Under the condition of this light quantity, stop irradiating.Obtain thus comprising the LCD10 of transparency cover 7.
[characteristic of light source]
Fig. 7 represents the summary situation of the spectral distribution (characteristic of the light irradiation that comprises UV) in the example of light source (high-pressure mercury UV-lamp) of the irradiation unit 300 of present embodiment.The light source (high-pressure mercury UV-lamp) of this irradiation unit 300 has main output (spectral component) more than wavelength 365nm.For example, there is 365nm(w1 as predominant wavelength), there is 405nm(w2 as commplementary wave length), 435nm(w3).
Corresponding with the characteristic of above-mentioned light source, light-cured type bonding agent 8 preferably uses mainly at 365(w1 substantially) near there is the light-cured type bonding agent of high sensitivity, be for example combined with the light-cured type bonding agent of the polymerization initiator high in the ratio of the absorbance of wavelength 365nm etc.
[light-cured type bonding agent]
Fig. 5 represents as at the above-mentioned S5 of present embodiment 1() in the constituent and properties etc. of light-cured type bonding agent 8 of the bonding agent that uses.As shown in Fig. 5 (a), light-cured type bonding agent 8, as main constituent, has oligomer (oligomer) 83 and the polymkeric substance (polymer) 84 such as the monomers such as polymerization initiator 81, acrylate monomer 82, acrylate oligomer.The characteristic of the absorbance of light-cured type bonding agent 8 is mainly determined by the characteristic of polymerization initiator 81.Polymerization initiator 81 reacts (extinction) with the light that comprises UV, causes/promote the polymerization of monomer 82 and oligomer 83.In addition, the object that contains polymkeric substance 84 is in order to obtain suitable viscosity in the time applying/be coated with this bonding agent 8.
(b) of Fig. 5 represents the characteristic (ratio of the absorbance of each extinction wavelength) of the absorbance of polymerization initiator 81.W1: the first extinction wavelength is 365nm; W2: the second extinction wavelength is 405nm; W3: the 3rd extinction wavelength is 435nm.They are to select accordingly with the characteristic of the wavelength of the light source of Fig. 7.In addition, Fig. 6 represents the relation of each wavelength etc., therefore, wishes suitable reference.
In the past, general light-cured type bonding agent, for the predominant wavelength 365nm(w1 improving at light source) photo-curable, large more options are for example by 365nm(w1) absorbance be made as at 1 o'clock, 405nm(w2) above absorbance is the polymerization initiator of 0～0.1 left and right.That is, as the characteristic of the polymerization initiator of example in the past, absorbance=1:(0～0.1 of the absorbance for w1: w2).
On the other hand, the light-cured type bonding agent 8 of present embodiment, by improving below the about 400nm of UV() the predominant wavelength 365nm(w1 of the light source in region) photo-curable and be positioned at non-UV(visible ray) near the wavelength 405nm(w2 border of region or UV and visible ray) photo-curable, the UV(w1 of inhibition to polarization plates 5) irradiation time.For this reason, the polymerization initiator 81 containing in this light-cured type bonding agent 8 is for meeting the formation of following condition A etc.
As condition A, in the ratio of the absorbance of wavelength (ratio), by 365nm(w1) absorbance be made as at 1 o'clock, absorbance=1:(0.25～0.5 of the absorbance for w1: w2).The absorbance of w2, adopts the ratio large value of example (0～0.1) in the past, is above-mentioned (0.25～0.5).; with respect to example (absorbance=1:(0～0.1 of the absorbance of w1: w2) in the past); in condition A; for following structure: suppress a little the w1(365nm as UV) the degree of extinction, make the w2(405nm on the border (wavelength almost not absorbing at the PVA of polarization plates 5 layer 52) as non-UV or UV and visible ray) more than the degree of extinction of wavelength further increase.
As above-mentioned condition A, use and contain 405nm(w2) the dulling luminosity ratio bonding agent 8 of large polymerization initiator 81 in the past.Thus, can shorten utilize the bonding agent 8 that carries out of light irradiation that comprises UV solidify (bonding) needed irradiation time (can make the operation of above-mentioned S13 promptly complete).Thus, can prevent/impact on polarization plates 5 (damage being caused by contraction) that suppresses to be caused by light irradiation, can guarantee display quality.
In addition, w1=365nm, as also represented at Fig. 7, is to select accordingly with the predominant wavelength of light source.In addition, w2=405nm be corresponding with the commplementary wave length of light source and with compare the polarization plates 5 longer wavelength (or wavelength of the upper limit of borderline region (for example 360～405nm)) of the UV of (contraction being caused by extinction) that exerts an influence and select accordingly.In addition, w3=435nm selects accordingly with the commplementary wave length of the light source longer than w2.
The lower limit 0.25 of the scope of the absorbance of the w2 of above-mentioned condition A, has selected value fully large compared with value (0～0.1) in the past.The higher limit 0.5 of the scope of the absorbance of the w2 of above-mentioned condition A is to select accordingly with the higher limit of the light-cured type bonding agent (polymerization initiator) that can manufacture/obtain at present.
As the embodiment a of the A that satisfies condition, for example, absorbance=1:0.25 of the absorbance that the ratio of the absorbance of polymerization initiator 81 is w1: w2.As another embodiment b, absorbance=1:0.3 of the absorbance for w1: w2.As another embodiment c, absorbance=1:0.4 of the absorbance for w1: w2.As another embodiment d, absorbance=1:0.5 of the absorbance for w1: w2.In any embodiment, all obtained the above-mentioned effect of guaranteeing display quality.Particularly, when the absorbance of the absorbance selecting w1: w2=1:0.5 manufactures display device 10 and display quality is evaluated, can't see the deteriorated of display quality, confirmed good result.
Then, as condition B, as described below.The large polymerization initiator 81 of ratio that more uses the absorbance of the w2 as above-mentioned condition A, more can obtain higher effect (shortening).But, as non-UV(visible ray) w2(405nm) more than wavelength there is the polymerization initiator of large absorbance, it is light yellow that material self is mostly.The shortcoming that the transparency of the material that has light-cured type bonding agent and contain this light-cured type bonding agent reduces therefrom.In addition, the in the situation that of above-mentioned polymerization initiator, react in visible region, therefore, even under the illumination of general fluorescent light etc., solidifying of this bonding agent also accelerates significantly.Therefore, transparency cover 7 is during fabrication with the bonding process of LCD panel 9 and in operating, and this bonding agent solidifies immediately, therefore, manufactures and becomes difficulty.The for example module after above-mentioned lamination occurred foreign matter sneak into etc. abnormal, be difficult to peel off and reform.
Due to above-mentioned reason, as condition B(taking condition A as prerequisite), with regard to the ratio of the absorbance of polymerization initiator 81, the ratio of the absorbance of the wavelength of visible region is reduced.Particularly, making w3(435nm) ratio of the absorbance of above wavelength reduces.Particularly preferably use and absorb hardly 435nm(w3) polymerization initiator of the light of above wavelength.As condition B, for example, be absorbance=1:(0～0.1 of the absorbance of w1: w3).W3=435nm is the wavelength 435nm(Fig. 7 occurring with the commplementary wave length as light source) select accordingly.Thus, be suppressed at the extinction of the wavelength of the visible region (particularly w3) of illumination light, improve the transparency after bonding agent 8 solidifies.
As the polymerization initiator that presents the characteristic that meets above-mentioned condition A, B 81 containing in light-cured type bonding agent 8, for example, can use following material (being BASF Amada Co., Ltd. (BASF Japan Ltd.) manufactures):
2-benzyl-2-dimethylamino-1-(4-morpholinyl phenyl)-butanone-1(trade name: Irgacure369),
2-(dimethylamino)-2-[(4-aminomethyl phenyl) methyl]-1-[4-(4-morpholinyl) phenyl]-1-butanone (trade name: Irgacure379),
Two (2,6-dimethoxy benzoyl) (2,4,4-tri-methyl-amyl) phosphine oxides (trade name: Irgacure1700),
By two (2,6-dimethoxy benzoyls)-2,4, the polymerization initiator (trade name: Irgacure1800) that 4-tri-methyl-amyl phosphine oxide and 1-hydroxy-cyclohexyl phenyl ketone are obtained by mixing with 1:3,
By two (2,6-dimethoxy benzoyls)-2,4, the polymerization initiator (trade name: Irgacure1850) that 4-tri-methyl-amyl phosphine oxide and 1-hydroxy-cyclohexyl phenyl ketone are obtained by mixing with 1:1,
The polymerization initiator (trade name: Darocur4265) that 2-hydroxy-2-methyl-1-phenyl-propane-1-ketone and 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide are obtained by mixing with 1:1.
In addition, as mentioned above, the light-cured type bonding agent 8 of manufacturing in S5/preparing, can make of a kind of polymerization initiator, also polymerization initiator of more than two kinds can be mixed to make.
In addition, as the acrylate monomer 82 containing in light-cured type bonding agent 8, acrylate oligomer 83, preferably select easily to be promoted by above-mentioned polymerization initiator 81 monomer, the oligomer of the initiation/development of polymerization.
In order to keep high display quality, after light-cured type bonding agent 8(solidifies) refractive index to be preferably adjusted into the refringence of transparency cover 7 be below 0.03.More preferably this refringence is below 0.02.
In addition, under these conditions, the little error of to w1=365nm, w2=405nm, w3=435nm, allow ± a.In addition, above-mentioned wavelength w1, w2, w3 select accordingly with the characteristic (Fig. 7) of light source (high-pressure mercury UV-lamp), still, and according to the use of different light sources, in the different situation of the characteristic of light source, can adjust matchingly with it value of above-mentioned condition w1, w2, w3.
[relation of each wavelength]
Fig. 6 represents the relation of each wavelength in present embodiment, visible ray-UV region etc. in order to understand/to supplement.Transverse axis is light wavelength [nm].Visible region is about 400～800nm, and UV(is near ultraviolet ray particularly) region is about 200～400nm.As their borderline region, for example, be 365nm～405nm.
UV region below the about 400nm of wavelength is to the PVA layer 52 of polarization plates 5 exert an influence (contraction being caused by extinction).Accordingly, TAC layer (51,53) has the character that protection PVA layer 52 is avoided the impact of the light below the about 400nm of wavelength.
Above-mentioned w1=wavelength 365nm is the predominant wavelength (Fig. 7) of light source, correspondingly selects bonding agent 8(polymerization initiator 81) main extinction wavelength.Above-mentioned w2=wavelength 405nm is the commplementary wave length (Fig. 7) of light source, is the higher limit of the borderline region of UV and visible ray, is that the PVA layer 52 of polarization plates 5 is not almost had to influential wavelength.Correspondingly select bonding agent 8(polymerization initiator 81) less important extinction wavelength.
[absorbance of polarization plates]
Fig. 8 represents the figure that the absorbance by wavelength of the LCD polarization plates to above-mentioned structure is in the past measured.Absorbance is herein the value of whole polarization plates.As shown in the figure, near known polarization plates absorbing wavelength 400nm (the line a) degree of following light is high.
In addition, absorbance is the characteristic of the degree of weakened while representing that light passes through object, is to get the common logarithm of transmissivity and give negative sign and the value that obtains.The absorbance A of wavelength X
λ=-log(I/Io), I: transmitted intensity, Io: incident intensity.
[effect etc.]
As with respect to embodiment 1(bonding agent 8) comparative example, use commercially available UV curing type bonding agent SVR1100(Sony Chemical and information equipment company (Sony Chemical & Information Device Corporation)), make same LCD module., by LCD panel and the transparency cover same with embodiment 1, under the state after utilizing above-mentioned UV curing type bonding agent SVR1100 overlapping, irradiate and comprise ultraviolet light it is solidified from same light source.In this case, as the irradiation light quantity of solidifying (bonding completely) for this bonding agent SVR1100, need 5000mJ/cm
2accumulative total light quantity.On the other hand, in present embodiment 1, use light-cured type bonding agent 8, with 3000mJ/cm
2accumulative total light quantity realized solidify (bonding).Thus, with respect to comparative example, the polarization plates 5 that can shorten LCD panel 9 is exposed to the approximately time of the UV light below 400nm that comprises wavelength 365nm.By this time shorten, can prevent/reduce the damage being caused by contraction of the PVA layer 52 of polarization plates 5, do not observe in fact the deteriorated of display quality that skew by polarization axle etc. causes., can in the time of the manufacture of LCD10, guarantee display quality.
< embodiment 2 >
Then, use Fig. 9 to describe embodiment 2.In the display device 10 and manufacture method thereof of embodiment 2, the content difference of the 3rd operation of the S13 of the manufacture method (Fig. 4) of the display device 10 of embodiment 1.In the 3rd operation of the S13 of embodiment 2, as from irradiation unit 300(light source) the structure of the irradiation that comprises ultraviolet light, use for using the optical filter (UV interdicts optical filter) 901 as the approximately light below the 400nm blocking of the absorbing wavelength of the polarization plates 5 of LCD panel 9.This optical filter 901 is arranged on to light source and object LCD(10) between.Make the light that comprises UV from light source via optical filter 901 LCD(10 to the layer-by-layer state of above-mentioned S12) irradiate.Thus, to bonding agent 8 illumination wavelength 405nm(w2) above light irradiation solidifies bonding agent 8.Implement this irradiation until accumulative total light quantity becomes 5000mJ/cm
2.By utilizing optical filter 901 by the UV blocking of about wavelength 400nm following (comprising w1=365nm), although the curing irradiation time (accumulative total light quantity) that needs of bonding agent 8, but, about the damage of the contraction being caused by extinction that prevents/suppress polarization plates 5, obtain higher effect.
Fig. 9 roughly represents the example of light-struck mode of the 3rd operation of above-mentioned S13.UV irradiation unit 300 is at light source and object LCD(10) between be provided with the structure of optical filter 901.The LCD panel (10) of the layer-by-layer state of S12 is fixed on platform or conveyance machinery 900 in X, Y-direction conveyance, from the light source of the UV irradiation unit 300 of the upside of Z direction, irradiates via above-mentioned optical filter 901 downward directions the light that comprises UV.Thus, to object LCD(10) bonding agent 8 irradiate by optical filter 901 light after the light blocking below wavelength 400nm, this bonding agent 8 is solidified.In addition,, as other modes, also can adopt and LCD panel (10) side fixedly be made to mode that light source side moves etc.
[mensuration of the state of cure of bonding agent]
In addition, as supplementing of above-mentioned embodiment, for the state of cure of light-cured type bonding agent 8, will increase by 100 times of above states with the bonding agent 8 state resilience in comparison modulus that is liquid, be judged as curing state, i.e. bonding state (the accumulative total light quantity in this moment is above-mentioned value).In addition, for above-mentioned elastic modulus, utilize Measurement of Dynamic Viscoelasticity device (RS6000, Haake (HAAKE) company), irradiation ultraviolet radiation makes accumulative total light quantity change and measure.
The > such as < effect
As described above, according to each embodiment, in the manufacturing process that utilizes bonding agent 8 that transparency cover 7 and LCD panel 9 are fitted, use that to contain in the ratio of the absorbance of wavelength be 365nm(w1) absorbance: 405nm(w2) absorbance=1:(0.25～0.5) the light-cured type bonding agent 8 of polymerization initiator 81.Thus, can suppress the damage by UV-induced contraction of polarization plates 5, guarantee the display quality of display device (LCD) 10.In the present embodiment, the balance of the ratio of the absorbance by the each wavelength to bonding agent 8 (w1, w2, w3) suitably designs, and has realized and has suppressed the texts that affects on polarization plates 5.
Above, based on embodiment, the invention being completed by the inventor has been carried out to specific description, but the present invention is not limited to above-mentioned embodiment, can in the scope that does not depart from its purport, carries out various changes, this is self-evident.For example, be not limited to the LCD panel 9 of above-mentioned embodiment, also can be applied to its display panel in addition, for example, use the organic EL display of organic EL panel etc.In addition, be not limited to polarization plates, can apply too for the functional layer with the characteristic deteriorated because of UV.In addition, for example, also can apply for the organic protective films such as the PET film using in the situation that touch sensor layer etc. is sticked on panel etc.
Symbol description
1 first substrate (tft array substrate)
2 second substrates (colored filter substrate)
3 seals
4,5 polarization plates
6 liquid crystal layers
7 transparency covers
8 bonding agents (light-cured type bonding agent)
9 display panels (LCD panel)
10 display device (LCD)
81 polymerization initiators
82 monomers
83 oligomer
84 polymkeric substance
Claims (11)
1. a display device, it is to use bonding agent that display panel and transparency cover are fitted and the display device of formation, it is characterized in that:
Described bonding agent is the light-cured type bonding agent that comprises polymerization initiator,
In the case of near the first wavelength of the light irradiation of the photocuring for described bonding agent is 365nm and second wave length be near 405nm,
Described polymerization initiator is the absorbance of the first wavelength in the ratio of the absorbance of wavelength: absorbance=1:(0.25～0.5 of second wave length).
2. display device as claimed in claim 1, is characterized in that:
In the case of near the three-wavelength of the light irradiation of the photocuring for described bonding agent is 435nm,
Described polymerization initiator is the absorbance of the first wavelength in the ratio of the absorbance of wavelength: absorbance=1:(0～0.1 of three-wavelength).
3. display device as claimed in claim 1 or 2, is characterized in that:
Described bonding agent comprises by described polymerization initiator and causes and monomer and the oligomer of polymerization.
4. display device as claimed in claim 1, is characterized in that:
Described transparency cover is mainly made up of glass or organic glass.
5. display device as claimed in claim 1, is characterized in that:
Described transparency cover is touch panel layer.
6. display device as claimed in claim 1, is characterized in that:
Described display panel is using a fit side of described transparency cover of described bonding agent to have polarization plates,
Described polarization plates and described transparency cover use described bonding agent laminating.
7. display device as claimed in claim 6, is characterized in that:
Described polarization plates comprises: layer of polarizer, and this layer of polarizer is subject to comprising the ultraviolet impact of described the first wavelength; And protective seam, this protective seam protects described layer of polarizer to avoid comprising the ultraviolet impact of described the first wavelength.
8. a manufacture method for display device, it is the manufacture method that uses the display device that bonding agent forms the laminating of display panel and transparency cover, it is characterized in that:
, have in the operation of described display panel and the laminating of described transparency cover at the described bonding agent of use:
The first operation, applies described bonding agent at the face of described display panel or the face of described transparency cover;
The second operation, makes the face that is coated with bonding agent of described display panel or transparency cover and the described display panel of this bonding agent of uncoated or the face of transparency cover, overlapping in the mode relatively contacting; With
The 3rd operation, is used the irradiation unit that comprises light source, and the face of described overlap condition is irradiated to the light for the photocuring of described bonding agent, makes thus this bonding agent photocuring,
Described bonding agent is the light-cured type bonding agent that comprises polymerization initiator,
In the case of near the first wavelength of the light irradiation of the photocuring for described bonding agent is 365nm and second wave length be near 405nm,
Described polymerization initiator is the absorbance of the first wavelength in the ratio of the absorbance of wavelength: absorbance=1:(0.25～0.5 of second wave length).
9. the manufacture method of display device as claimed in claim 8, is characterized in that:
In the case of near the three-wavelength of the light irradiation of the photocuring for described bonding agent is 435nm,
Described polymerization initiator is the absorbance of the first wavelength in the ratio of the absorbance of wavelength: absorbance=1:(0～0.1 of three-wavelength).
10. the manufacture method of display device as claimed in claim 8, is characterized in that:
In described the 3rd operation, as the characteristic of described light source, described the first wavelength is predominant wavelength, and described second wave length is commplementary wave length.
The manufacture method of 11. display device as claimed in claim 8, is characterized in that:
In described the 3rd operation,, between described light source and the face of described overlap condition, disposing the optical filter of the light blocking below about wavelength 400nm during to the face light irradiation of described overlap condition from described light source.
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| JP2012258017A JP2014106305A (en) | 2012-11-26 | 2012-11-26 | Display device, and manufacturing method of display device |
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| CN111791559A (en) * | 2020-07-27 | 2020-10-20 | 广州视源电子科技股份有限公司 | Protective cover plate, display device and manufacturing method of protective cover plate |
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| EP3532538A1 (en) | 2016-10-27 | 2019-09-04 | 3M Innovative Properties Company | Crosslinkable composition including a (meth)acrylic polymer and methods of making a crosslinked composition |
| JP6360605B1 (en) * | 2017-08-30 | 2018-07-18 | リンテック株式会社 | Manufacturing method of display body |
| JP6438165B1 (en) * | 2018-06-22 | 2018-12-12 | リンテック株式会社 | Adhesive sheet and display |
| JP2023013533A (en) * | 2021-07-16 | 2023-01-26 | 住友化学株式会社 | Polarizing plate and laminate |
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| JP5310417B2 (en) * | 2009-09-10 | 2013-10-09 | ソニー株式会社 | Liquid crystal display device and electronic device |
| US20120327345A1 (en) * | 2010-03-12 | 2012-12-27 | Sharp Kabushiki Kaisha | Display panel and process for production thereof |
| JP2012145751A (en) * | 2011-01-12 | 2012-08-02 | Nippon Shokubai Co Ltd | Ultraviolet curable resin composition for optical use, hardened material, and display device |
| JP2012144634A (en) * | 2011-01-12 | 2012-08-02 | Jsr Corp | Optical resin and method for producing optical resin layer, composition for optical resin, and image display device |
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| US20030090616A1 (en) * | 2001-09-27 | 2003-05-15 | Yoshihiro Hirakawa | Method of and apparatus for producing liquid crystal display unit |
| JP2009093200A (en) * | 2002-06-18 | 2009-04-30 | Sony Corp | Display device, electronic device having display device, and method for manufacturing display device |
| CN101663602A (en) * | 2007-03-16 | 2010-03-03 | 东亚合成株式会社 | Optical film layered body, its manufacturing method, and display device using the same |
| CN102445798A (en) * | 2010-10-13 | 2012-05-09 | 索尼公司 | Display device |
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| CN111791559A (en) * | 2020-07-27 | 2020-10-20 | 广州视源电子科技股份有限公司 | Protective cover plate, display device and manufacturing method of protective cover plate |
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