JP2006221187A - Display device - Google Patents

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JP2006221187A
JP2006221187A JP2006111512A JP2006111512A JP2006221187A JP 2006221187 A JP2006221187 A JP 2006221187A JP 2006111512 A JP2006111512 A JP 2006111512A JP 2006111512 A JP2006111512 A JP 2006111512A JP 2006221187 A JP2006221187 A JP 2006221187A
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transparent
liquid crystal
optical film
thickness
display device
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JP4227625B2 (en
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Tsutomu Matsudaira
努 松平
Mitsuyoshi Hara
光義 原
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Seiko Instruments Inc
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Seiko Instruments Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To eliminate uneven display on a display device, having a transparent touch switch. <P>SOLUTION: The transparent adhesive layer is made even in a display device, which has the rear side of the input of the transparent touch switch adhered to the display section of the display element by using a transparent adhesive. For example, a spacer is provided as thick as the polarizer plate at the level different area of the glass substrate and the polarizer of the display element. A stabilized display quality is realized with such a constitution. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ペン入力などの機能を有する携帯機器等に使用される表示装置に関する。   The present invention relates to a display device used for a portable device having a function such as pen input.

従来、液晶表示装置の上に透明タッチスイッチを配置する方法として、液晶表示装置の表示面と透明タッチスイッチ７の入力エリアの裏面を透明接着剤６で面接着していた。この従来の断面構造を図５〜７に示す。具体的には、図５は液晶表示装置の端子部が無い辺の接着構造の断面図であり、図６は液晶表示装置の端子部がある辺の断面図である。更に、図７には、アイコンシート１１を透明タッチスイッチと液晶表示装置の間に配置した辺の断面図を示した。   Conventionally, as a method of disposing a transparent touch switch on a liquid crystal display device, the display surface of the liquid crystal display device and the back surface of the input area of the transparent touch switch 7 are surface-bonded with a transparent adhesive 6. This conventional cross-sectional structure is shown in FIGS. Specifically, FIG. 5 is a cross-sectional view of the side of the liquid crystal display device without the terminal portion, and FIG. 6 is a cross-sectional view of the side of the liquid crystal display device with the terminal portion. Further, FIG. 7 shows a sectional view of a side where the icon sheet 11 is disposed between the transparent touch switch and the liquid crystal display device.

しかしながら、図５に示す構造において、液晶表示装置上に透明タッチスイッチ７を紫外線硬化型等の透明接着剤６により面接着する場合、透明接着剤６を透明タッチスイッチ７と液晶表示装置の間に充填し、透明タッチスイッチ７側から紫外線を照射することにより透明接着剤６を硬化したとき、透明接着剤６には硬化収縮が発生する。   However, in the structure shown in FIG. 5, when the transparent touch switch 7 is surface-bonded to the liquid crystal display device with a transparent adhesive 6 such as an ultraviolet curing type, the transparent adhesive 6 is interposed between the transparent touch switch 7 and the liquid crystal display device. When the transparent adhesive 6 is cured by filling and irradiating ultraviolet rays from the transparent touch switch 7 side, curing shrinkage occurs in the transparent adhesive 6.

透明接着剤６が充填された面の偏光板３の外形は、位置合わせのバラツキや公差を考慮して画面の可視エリアより大きく切断されて貼り付けられている。一般的には、偏光板３の外周にはおおよそ２．０ｍｍの段差部分Ｌがあり、その段差部分Ｌと偏光板３のある部分では透明接着剤６の層の厚みが異なることとなり、そのため、硬化収縮量に違いが生ずる。   The outer shape of the polarizing plate 3 on the surface filled with the transparent adhesive 6 is cut and pasted so as to be larger than the visible area of the screen in consideration of alignment variations and tolerances. In general, there is a stepped portion L of approximately 2.0 mm on the outer periphery of the polarizing plate 3, and the thickness of the layer of the transparent adhesive 6 is different between the stepped portion L and the portion where the polarizing plate 3 exists. Differences in cure shrinkage occur.

したがって、その部分に内部応力が発生し、液晶層のギャップが変化する。結果的にシール剤５の内側の周辺に表示むらが発生した。   Therefore, an internal stress is generated in that portion, and the gap of the liquid crystal layer changes. As a result, display unevenness occurred around the inside of the sealant 5.

図６に示す液晶表示装置の端子部の設けられた辺においては、段差部分Ｌが更に大きくなり、同様にシール剤５の内側周辺に表示むらが発生した。   In the side where the terminal portion of the liquid crystal display device shown in FIG. 6 is provided, the stepped portion L is further increased, and display unevenness is similarly generated around the inner side of the sealant 5.

この表示むらは特にＳＴＮの場合厳しく、液晶層のギャップがおよそ０．１μｍ変化したときに目立つようになる。そのため、液晶層のギャップ変化を極力小さくする構造にする必要がある。   This display unevenness is particularly severe in the case of STN, and becomes noticeable when the gap of the liquid crystal layer changes by about 0.1 μm. Therefore, it is necessary to have a structure that minimizes the gap change of the liquid crystal layer.

更に液晶層のギャップ変化は使用する透明基板の厚みが薄いほど大きくなる。現状では０．７ｍｍ厚のガラス基板を使用しているが、薄型化に向けて０．５５ｍｍや、０．４ｍｍ厚のガラスが使用されはじめており、表示ムラに対しては、一段と厳しい条件となってきている。   Furthermore, the change in the gap of the liquid crystal layer increases as the thickness of the transparent substrate used decreases. At present, a 0.7 mm thick glass substrate is used, but 0.55 mm and 0.4 mm thick glass are beginning to be used for thinning, and it becomes a more severe condition for display unevenness. It is coming.

また、図７に示すマークを印刷したアイコンシート１１を液晶表示装置と透明タッチスイッチ７の間に配置した構造では、一般的には、アイコンシート１１を透明タッチスイッチ７または液晶表示装置の偏光板３に設け、紫外線硬化型の透明接着剤６によって透明タッチスイッチ７と液晶表示装置を貼り合わせることにより形成される。この場合、透明接着剤６を充填する際に、アイコンシート１１部分に気泡を抱き込んでしまう問題や、やはりアイコンシート１１部分と偏光板３部分の硬化収縮量が異なり、周辺に表示むらが発生した。   In the structure in which the icon sheet 11 on which the mark shown in FIG. 7 is printed is disposed between the liquid crystal display device and the transparent touch switch 7, generally, the icon sheet 11 is attached to the transparent touch switch 7 or the polarizing plate of the liquid crystal display device. 3, the transparent touch switch 7 and the liquid crystal display device are bonded together by an ultraviolet curable transparent adhesive 6. In this case, when the transparent adhesive 6 is filled, there is a problem that air bubbles are embraced in the icon sheet 11 part, and the amount of curing shrinkage between the icon sheet 11 part and the polarizing plate 3 part is different, and uneven display occurs in the periphery. did.

このように発生する表示むらを解決する手段のひとつとして、透明接着剤の硬化後の硬さをゲル状にすることで内部応力を拡散し、表示むらを解決することが可能である。しかしながらこの方法においては、透明接着剤の硬化後の硬さをゲル状にするに従い接着力が落ち、８０℃の高温または、-２０℃の低温での保存で透明タッチスイッチが剥がれる不良が発生するため、信頼性を保証することが困難であった。   As one means for solving the display unevenness that occurs in this way, it is possible to diffuse the internal stress by setting the hardness of the transparent adhesive after curing to a gel state, thereby solving the display unevenness. However, in this method, the adhesive strength decreases as the hardness of the transparent adhesive after curing becomes a gel, and the transparent touch switch is peeled off when stored at a high temperature of 80 ° C. or a low temperature of −20 ° C. Therefore, it has been difficult to guarantee reliability.

そこで、本発明は、透明タッチスイッチと液晶表示装置を透明接着剤で貼り合わせた構造において、透明接着剤の硬化後の硬さに関係なく、透明接着剤の硬化収縮により発生する内部応力が原因の表示むらを解決することにある。   Therefore, in the present invention, in a structure in which a transparent touch switch and a liquid crystal display device are bonded with a transparent adhesive, the internal stress generated by the curing shrinkage of the transparent adhesive is caused regardless of the hardness after the transparent adhesive is cured. It is to solve the display unevenness.

本問題を解決するために、この発明は、液晶表示装置の表示面と透明タッチスイッチの入力領域の裏面との間に透明接着剤を充填して紫外線などの光により硬化して接着してなる表示装置において、光学フイルムの外形寸法は、光学フイルムを貼り付けている透明基板より小さく、その光学フイルムの外周の段差寸法を１．０ｍｍ以下にすることで、透明接着剤層の光学フイルム外周の硬化収縮による内部応力を低減し、その結果、表示むらを解消した。   In order to solve this problem, the present invention is formed by filling a transparent adhesive between the display surface of the liquid crystal display device and the back surface of the input area of the transparent touch switch, and curing and bonding with light such as ultraviolet rays. In the display device, the outer dimension of the optical film is smaller than that of the transparent substrate to which the optical film is attached, and the step size of the outer periphery of the optical film is set to 1.0 mm or less, so that the outer periphery of the optical film of the transparent adhesive layer is reduced. The internal stress due to curing shrinkage was reduced. As a result, display unevenness was eliminated.

または、光学フイルムの外形を変えず、その光学フイルム外周の同等の位置にスペーサーを配設する構造にすることで、接着剤層の厚みを均一にし、硬化収縮量を違いにより発生する内部応力を解消した。   Or, by changing the outer shape of the optical film and using a structure in which spacers are arranged at the same position on the outer periphery of the optical film, the thickness of the adhesive layer is made uniform, and the internal stress caused by differences in the amount of cure shrinkage is reduced. It was solved.

また、文字やアイコン等の絵を表示面に配置する場合は、光学フイルムが貼り付けられている透明基板上か、もしくはその光学フイルム上にインクにより印刷することで接着剤層を均一にすることができる。このようにアイコンシートを無くした構成では、透明接着剤の充填工程において接着剤の流れる速度が安定し、気泡の抱き込みが発生しない。さらに、接着剤層の厚みが均一なので、硬化収縮量の差により発生する内部応力が発生することがなく、そのため表示むらが発生しない。   Also, when placing pictures such as letters and icons on the display surface, make the adhesive layer uniform by printing with ink on the transparent substrate on which the optical film is affixed or on the optical film. Can do. In the configuration without the icon sheet in this way, the flow rate of the adhesive is stabilized in the transparent adhesive filling process, and bubbles are not embraced. In addition, since the thickness of the adhesive layer is uniform, internal stress generated due to the difference in curing shrinkage does not occur, and therefore display unevenness does not occur.

本発明は透明タッチスイッチを液晶表示装置に面接着して配置した時に発生する表示むらを解消でき、安定した表示品質の表示装置を提供できるようになった。   The present invention can eliminate display unevenness that occurs when a transparent touch switch is disposed on a liquid crystal display device and is provided with a display device with stable display quality.

また、アイコンシートを削減したことにより気泡抱き込みなどの不良が減少し、歩留まりが向上した。その結果、コストダウンができ、安価な表示装置を提供できるようになった。   In addition, by reducing the number of icon sheets, defects such as entrapment of bubbles have been reduced and yield has been improved. As a result, the cost can be reduced and an inexpensive display device can be provided.

表示素子とタッチスイッチを接合する接着層の厚みが均一になるように表示装置を構成する。例えば、偏光板とガラス基板の段差部分を小さくする、または、この段差部分に偏光板厚と同等厚のスペーサーを設置する。このような構成により、透明接着の層の厚みをほぼ均一にすることができるので、透明接着剤の硬化時に発生する硬化収縮量がほぼ一定となり、透明接着剤の内部応力が低減され、表示むらは発生しない。   The display device is configured such that the thickness of the adhesive layer that joins the display element and the touch switch is uniform. For example, the step portion between the polarizing plate and the glass substrate is made small, or a spacer having a thickness equal to the thickness of the polarizing plate is installed at the step portion. With such a configuration, the thickness of the transparent adhesive layer can be made substantially uniform, so that the amount of curing shrinkage that occurs when the transparent adhesive is cured becomes substantially constant, the internal stress of the transparent adhesive is reduced, and display unevenness Does not occur.

さらに、文字やアイコン等のシンボルを表示面に設ける場合は、光学フイルムが貼り付けられている透明基板上や光学フイルム上にインクにより印刷することで接着剤層を均一にすることができる。そのために、透明接着剤の気泡の抱き込みや、表示むらを解消することができる。   Furthermore, when symbols such as characters and icons are provided on the display surface, the adhesive layer can be made uniform by printing with ink on a transparent substrate on which the optical film is attached or on the optical film. Therefore, it is possible to eliminate the inclusion of bubbles in the transparent adhesive and display unevenness.

以下に本発明の実施例を図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は本発明の表示装置の実施例１の断面図である。液晶表示装置は０．７ｍｍのガラス基板１と２の間に６．３μｍの液晶層を形成するように保持され、０．３２ｍｍの厚みの偏向板３と０．２５ｍｍの厚みの反射板付き偏向板４が貼り付けられている。   FIG. 1 is a cross-sectional view of Embodiment 1 of the display device of the present invention. The liquid crystal display device is held so as to form a 6.3 μm liquid crystal layer between the 0.7 mm glass substrates 1 and 2, and has a deflection plate 3 having a thickness of 0.32 mm and a deflection plate having a reflection plate having a thickness of 0.25 mm. A plate 4 is affixed.

偏光板３は、ガラス基板１の外形に対し、０．８ｍｍの位置に貼り付けられており、その表面に０．７ｍｍのガラス基板を用いた透明タッチスイッチ７が透明接着剤６により接着されている。   The polarizing plate 3 is attached to a position of 0.8 mm with respect to the outer shape of the glass substrate 1, and a transparent touch switch 7 using a 0.7 mm glass substrate is adhered to the surface by a transparent adhesive 6. Yes.

ここで用いた透明接着剤６の硬化後のショアＡによる硬度は１０である。接着剤層は、偏光板３上で約０．１ｍｍとなり、偏光板３の外周の段差部分Ｌは、偏光板厚を含むため約０．４２ｍｍとなる。接着剤の硬化収縮率が５％のため、偏光板３上で５μｍの収縮、段差部分では２１μｍの収縮となるが、段差部分Ｌを０．８ｍｍとしたことで内部応力が減少し、液晶層に対し０．１μｍ以下のギャップ変化しか与えない。そのため、表示むらは発生しない。   The hardness of Shore A after curing of the transparent adhesive 6 used here is 10. The adhesive layer is about 0.1 mm on the polarizing plate 3, and the stepped portion L on the outer periphery of the polarizing plate 3 is about 0.42 mm because it includes the thickness of the polarizing plate. Since the cure shrinkage rate of the adhesive is 5%, the shrinkage is 5 μm on the polarizing plate 3 and the shrinkage is 21 μm at the step portion. However, when the step portion L is 0.8 mm, the internal stress is reduced and the liquid crystal layer is reduced. On the other hand, only a gap change of 0.1 μm or less is given. Therefore, display unevenness does not occur.

図２は、本発明による表示装置の実施例２を示し、偏光板３の段差部分Ｌにスペーサー８を設置した構成の表示装置である。すなわち、実施例１のように偏光板３の段差部分Ｌを偏光板３の外形を大きくすることで削減するのではなく、スペーサー８を設置することで削減した。スペーサー８は、粘着剤付きのポリエステルフイルムで総厚が０．３ｍｍで偏光板３とほぼ同一の厚みである。スペーサーは、透明タッチスイッチ７を透明接着剤６で接着する前に段差部分Ｌに設置されても、透明タッチスイッチ７側に設置されておいてもよい。また、透明接着剤を硬化する前に、隙間に挿入してもよい。但し、接着剤硬化前に挿入する場合には、接着剤の層の厚みに影響する場合があり、表示むらが出ることがある。   FIG. 2 shows a second embodiment of the display device according to the present invention, which is a display device having a configuration in which a spacer 8 is provided at the stepped portion L of the polarizing plate 3. That is, the stepped portion L of the polarizing plate 3 was not reduced by increasing the outer shape of the polarizing plate 3 as in Example 1, but was reduced by installing the spacer 8. The spacer 8 is a polyester film with an adhesive and has a total thickness of 0.3 mm and is almost the same thickness as the polarizing plate 3. The spacer may be installed on the stepped portion L before the transparent touch switch 7 is bonded with the transparent adhesive 6 or may be installed on the transparent touch switch 7 side. Moreover, you may insert in a clearance gap before hardening a transparent adhesive agent. However, when inserted before the adhesive is cured, the thickness of the adhesive layer may be affected, and display unevenness may occur.

また、図３は液晶をドライブするＩＣ９が実装された端子部にスペーサー８を配置した断面で、基本的な構成は上記と同様である。ここでは、表示素子の端子部にＩＣを実装した後、段差部にスペーサー８を配置し透明タッチスイッチ７を接着して製作した。   FIG. 3 is a cross section in which a spacer 8 is arranged at a terminal portion where an IC 9 for driving liquid crystal is mounted, and the basic configuration is the same as described above. Here, after the IC was mounted on the terminal portion of the display element, the spacer 8 was disposed in the step portion, and the transparent touch switch 7 was bonded.

ガラス基板の端子部の裏面に偏光板が配置されていると端子部にＩＣを実装することが困難になり、一方、端子部にＩＣを実装した後に偏光板３をガラス基板１に貼り合わせたり、段差部に偏光板３を延長して配置したりすることも障害がある。そのため、ガラス基板の端子部にＩＣが実装された表示素子の場合には、前述したような、端子部にＩＣを実装した後で段差部にスペーサー８を配置し透明タッチスイッチ７を接着する方法が好ましい。   When a polarizing plate is disposed on the back surface of the terminal portion of the glass substrate, it becomes difficult to mount an IC on the terminal portion. On the other hand, after mounting the IC on the terminal portion, the polarizing plate 3 is bonded to the glass substrate 1. In addition, there is an obstacle to extending the polarizing plate 3 at the stepped portion. Therefore, in the case of a display element in which an IC is mounted on the terminal portion of the glass substrate, as described above, after mounting the IC on the terminal portion, the spacer 8 is disposed on the step portion and the transparent touch switch 7 is bonded. Is preferred.

このような方法で形成された表示装置の構成によれば、接着剤層の厚みが均一になり、液晶層への影響も実施例１同様に低減する。さらに、ＩＣが実装された部分のガラス基板面がそることにより実装接続部に発生する接続不良を防ぐことができる。   According to the structure of the display device formed by such a method, the thickness of the adhesive layer becomes uniform, and the influence on the liquid crystal layer is reduced as in the first embodiment. Further, it is possible to prevent a connection failure occurring in the mounting connection portion due to the glass substrate surface of the portion where the IC is mounted being warped.

図４は、アイコンシートを削減した実施例である。構成は、実施例１と同様に偏光板３を透明基板３の外形から０．８ｍｍの位置に貼り付けている。アイコンマークは、偏光板３を貼り付ける前に、タコ印刷法により任意の形状のインクをガラス基板1に転写する。転写されたインク１０の厚みは、約５μｍでその上から偏光板３を貼り付けても、気泡を挟み込んで外観を損ねることはない。   FIG. 4 shows an embodiment in which icon sheets are reduced. The configuration is the same as in Example 1, in which the polarizing plate 3 is pasted at a position 0.8 mm from the outer shape of the transparent substrate 3. The icon mark transfers ink having an arbitrary shape to the glass substrate 1 by an octopus printing method before the polarizing plate 3 is attached. The thickness of the transferred ink 10 is about 5 μm, and even if the polarizing plate 3 is pasted thereon, air bubbles are not sandwiched and the appearance is not impaired.

但し、アイコンシートを使わないことにより、液晶表示装置の外形を大きくする必要があり、外形形状、および重量面でのデメリットはある。印刷する面はこの他に、下側の透明基板２の表面または、偏光板３の表面でもよい。   However, by not using an icon sheet, it is necessary to enlarge the outer shape of the liquid crystal display device, and there are demerits in the outer shape and weight. In addition to this, the surface to be printed may be the surface of the lower transparent substrate 2 or the surface of the polarizing plate 3.

本発明による実施例１の表示装置の断面図。Sectional drawing of the display apparatus of Example 1 by this invention. 本発明による実施例２の表示装置の断面図。Sectional drawing of the display apparatus of Example 2 by this invention. 本発明による実施例３の表示装置の断面図。Sectional drawing of the display apparatus of Example 3 by this invention. 本発明による実施例４の表示装置の断面図。Sectional drawing of the display apparatus of Example 4 by this invention. 従来技術の表示装置の断面図。Sectional drawing of the display apparatus of a prior art. 従来技術の表示装置の断面図。Sectional drawing of the display apparatus of a prior art. 従来技術の表示装置の断面図。Sectional drawing of the display apparatus of a prior art.

符号の説明Explanation of symbols

１，２ ガラス基板
３ 偏光板
６ 透明接着剤
７ 透明タッチスイッチ
８ スペーサー
９ ドライバＩＣ
１０ インク
１１ アイコンシート
Ｌ 段差部分 1, 2 Glass substrate 3 Polarizing plate
6 Transparent adhesive 7 Transparent touch switch 8 Spacer 9 Driver IC
10 Ink 11 Icon sheet L Stepped part

Claims (2)

対向基板と透明基板の間に液晶が保持された液晶表示素子と、前記透明基板に設けられ、前記透明基板より外形寸法の小さい光学フイルムと、を備え、
前記透明基板と前記光学フイルムの段差部分には、前記光学フイルムとほぼ同じ厚みのスペーサーを、前記液晶表示素子か透明板に設けて、光硬化型透明接着剤を介して前記透明板と接着していることを特徴とする表示装置。
A liquid crystal display element in which liquid crystal is held between a counter substrate and a transparent substrate, and an optical film provided on the transparent substrate and having an outer dimension smaller than that of the transparent substrate,
At the step portion of the transparent substrate and the optical film, a spacer having the same thickness as the optical film is provided on the liquid crystal display element or the transparent plate, and is adhered to the transparent plate via a photo-curing transparent adhesive. A display device.
対向基板と透明基板の間に液晶が保持された液晶表示素子と、前記液晶表示素子の前記透明基板に設けられ、前記透明基板より外形寸法の小さい光学フイルムと、前記光学フイルムの外周にある前記透明基板の表面に光硬化型透明接着剤を介して接着された透明板と、前記光硬化型透明接着剤の接着界面に形成した印刷物を備え、
前記光硬化型透明接着剤は、前記光学フイルムと前記透明板の間で形成する第二の厚みと、前記光学フイルムと前記透明板のどちらかの表面と前記印刷物の間で形成する第三の厚みと、前記光学フイルムの外周にある前記透明基板の表面と前記透明基板の間で形成し前記第二の厚みもしくは前記第三の厚みと前記光学フイルムの厚みの和に相当する第一の厚みと、を持ち、前記第一の厚みで接着される接着幅である前記光学フイルムの外周の段差部分が１．０ｍｍ以下である表示装置。
A liquid crystal display element in which liquid crystal is held between a counter substrate and a transparent substrate; an optical film provided on the transparent substrate of the liquid crystal display element; and having an outer dimension smaller than the transparent substrate; A transparent plate adhered to the surface of the transparent substrate via a photocurable transparent adhesive, and a printed matter formed on the adhesive interface of the photocurable transparent adhesive,
The photocurable transparent adhesive has a second thickness formed between the optical film and the transparent plate, and a third thickness formed between the surface of the optical film and the transparent plate and the printed matter. A first thickness corresponding to the sum of the second thickness or the third thickness and the thickness of the optical film formed between the surface of the transparent substrate on the outer periphery of the optical film and the transparent substrate; The display device has a step portion on the outer periphery of the optical film, which is an adhesive width bonded with the first thickness.
JP2006111512A 2006-04-14 2006-04-14 Display device Expired - Lifetime JP4227625B2 (en)

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