JP2011007830A - Display device - Google Patents
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- JP2011007830A JP2011007830A JP2009148304A JP2009148304A JP2011007830A JP 2011007830 A JP2011007830 A JP 2011007830A JP 2009148304 A JP2009148304 A JP 2009148304A JP 2009148304 A JP2009148304 A JP 2009148304A JP 2011007830 A JP2011007830 A JP 2011007830A
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Abstract
Description
本発明は表示装置に関し、特に携帯電話や携帯情報端末などに利用される表示装置に関する。 The present invention relates to a display device, and more particularly to a display device used for a mobile phone, a portable information terminal, and the like.
携帯電話や携帯情報端末には、表示装置として液晶表示デバイスを用いた表示装置が多用されている。これらの表示装置は、液晶シャッターをマトリクス状に配置し、画像を表示する液晶表示パネルと該液晶表示パネルに照明光を照射するバックライトから構成されている。 For mobile phones and portable information terminals, display devices using a liquid crystal display device as a display device are often used. These display devices include a liquid crystal display panel in which liquid crystal shutters are arranged in a matrix and display an image, and a backlight that irradiates the liquid crystal display panel with illumination light.
これらの表示装置のモジュール構造として、外光反射を低減するために、表示装置の画面保護カバー（フロントウィンドウ）を液晶表示パネルの前面に配置している。さらに、近年では、保護カバーを液晶表示パネルに一体化した構造（ハイブリッド構造）の表示装置も提案されている。 As a module structure of these display devices, a screen protection cover (front window) of the display device is arranged on the front surface of the liquid crystal display panel in order to reduce reflection of external light. In recent years, a display device having a structure (hybrid structure) in which a protective cover is integrated with a liquid crystal display panel has been proposed.
保護カバー（フロントウィンドウ）の表示パネル側には、保護カバーの飛散防止を目的として、ＰＥＴフィルムが貼り付けられている。 A PET film is affixed to the display panel side of the protective cover (front window) for the purpose of preventing the protective cover from scattering.
他方、保護カバーの表示パネル側の表面には、液晶表示パネルの表示領域を取り囲むように、黒枠のマスクが印刷されている。特に、バックライトからの照明光が、液晶表示パネルの周囲（液晶表示パネルとモールドとの間）から外部に漏れるのを防止するため、液晶表示パネルの周辺部分では、塗料を重ね塗りを行い、遮光性を高めたマスク印刷が形成されている。 On the other hand, a black frame mask is printed on the surface of the protective cover on the display panel side so as to surround the display area of the liquid crystal display panel. In particular, in order to prevent the illumination light from the backlight from leaking outside from the periphery of the liquid crystal display panel (between the liquid crystal display panel and the mold), the peripheral part of the liquid crystal display panel is overcoated, Mask printing with improved light shielding properties is formed.
マスク印刷を施した保護カバーにＰＥＴフィルムを貼り付けると、マスク印刷の近傍に気泡が残るという問題が生じていた。特に、マスク印刷は、表示パネルの表示領域を画定するものであるため、表示領域に気泡が掛かると、製品の品質が著しく低下する原因となる。 When a PET film was affixed to a protective cover that had been subjected to mask printing, there was a problem that air bubbles remained in the vicinity of the mask printing. In particular, since mask printing defines the display area of the display panel, if bubbles appear in the display area, the quality of the product is significantly reduced.
本発明が解決しようとする課題は、上記のような問題を解決し、保護カバーに印刷を施し、該印刷した面にＰＥＴフィルムを貼り付けた場合でも、印刷した領域の近傍に気泡が残ることを抑制することが可能な表示装置を提供することである。 The problem to be solved by the present invention is to solve the above problems, and even when printing is performed on the protective cover and a PET film is pasted on the printed surface, bubbles remain in the vicinity of the printed region. It is providing the display apparatus which can suppress this.
本発明の表示装置は、上述した課題を解決するため、以下のような特徴を有する。 In order to solve the above-described problems, the display device of the present invention has the following characteristics.
（１） 表示パネルと、該表示パネルの前面に配置される保護カバーとを有する表示装置において、該保護カバーの該表示パネル側の一部領域には印刷が施され、さらに、ＰＥＴフィルムが、該印刷された領域に少なくとも掛かるように該保護カバーに貼り付けられており、該印刷は、重ね塗りで形成される印刷の厚さが異なる段差部を有し、該段差部の幅が０．５ｍｍ以上であることを特徴とする。 (1) In a display device having a display panel and a protective cover disposed on the front surface of the display panel, printing is performed on a partial region of the protective cover on the display panel side, and further, a PET film, It is affixed to the protective cover so as to be at least covered with the printed region, and the printing has step portions having different print thicknesses formed by overcoating. It is 5 mm or more.
（２） 上記（１）に記載の表示装置において、該印刷は、該表示パネルの表示領域を囲むマスク印刷であり、該段差部が該表示領域側に形成されていることを特徴とする。 (2) In the display device according to (1), the printing is mask printing surrounding a display area of the display panel, and the step portion is formed on the display area side.
（３） 上記（２）に記載の表示装置において、該ＰＥＴフィルムは、該保護カバーの飛散防止又は該表示パネルの偏光板から出た直線偏光を円偏光（楕円偏光も含む）にする位相差板の役割を有していることを特徴とする。 (3) In the display device according to (2), the PET film has a phase difference that prevents scattering of the protective cover or converts linearly polarized light emitted from the polarizing plate of the display panel into circularly polarized light (including elliptically polarized light). It has the role of a plate.
（４） 上記（３）に記載の表示装置において、該ＰＥＴフィルムの該表示パネル側にはタッチパネルが接合され、該ＰＥＴフィルムの厚みは、該タッチパネルに接続されるフレキシブル・プリント回路と同等の厚みであることを特徴とする。 (4) In the display device according to (3), a touch panel is bonded to the display panel side of the PET film, and the thickness of the PET film is equal to that of a flexible printed circuit connected to the touch panel. It is characterized by being.
本発明は、上記（１）のように、表示パネルと、該表示パネルの前面に配置される保護カバーとを有する表示装置において、該保護カバーの該表示パネル側の一部領域には印刷が施され、さらに、ＰＥＴフィルムが、該印刷された領域に少なくとも掛かるように該保護カバーに貼り付けられており、該印刷は、重ね塗りで形成される印刷の厚さが異なる段差部を有し、該段差部の幅が０．５ｍｍ以上であるため、保護カバーとＰＥＴフィルムとの間で、印刷した領域の近傍に気泡が残るのを容易に抑制することが可能となる。しかも、印刷でできる段差部の幅を調整するだけで問題を解消できるため、従来の製造工程を複雑化させることもない。 In the display device having the display panel and the protective cover disposed on the front surface of the display panel as described in the above (1), the printing is performed in a partial region of the protective cover on the display panel side. In addition, a PET film is attached to the protective cover so as to cover at least the printed region, and the printing has a step portion having different thicknesses of printing formed by overcoating. Since the stepped portion has a width of 0.5 mm or more, it is possible to easily suppress air bubbles from remaining in the vicinity of the printed region between the protective cover and the PET film. In addition, since the problem can be solved only by adjusting the width of the stepped portion that can be printed, the conventional manufacturing process is not complicated.
上記（２）のように、印刷は、表示パネルの表示領域を囲むマスク印刷であり、段差部が表示領域側に形成されているため、表示領域に掛かる気泡が残ることもないため、製品の品質の低下を抑制することができる。 As described in (2) above, printing is mask printing that surrounds the display area of the display panel, and since the stepped portion is formed on the display area side, no bubbles are left on the display area. A reduction in quality can be suppressed.
上記（３）のように、ＰＥＴフィルムは、保護カバーの飛散防止又は表示パネルの偏光板から出た直線偏光を円偏光にする位相差板の役割を有しているため、保護カバーにＰＥＴフィルムを貼り付ける利点が大きい上、貼り付けに伴い、気泡が残るのも抑制でき、より高品位の表示装置を提供することが可能となる。 As described in (3) above, the PET film has the role of a retardation plate for preventing the scattering of the protective cover or converting the linearly polarized light emitted from the polarizing plate of the display panel into circularly polarized light. In addition to having a great advantage of sticking, it is possible to prevent bubbles from being left along with the sticking, and it is possible to provide a display device of higher quality.
上記（４）のように、ＰＥＴフィルムの表示パネル側にはタッチパネルが接合され、該ＰＥＴフィルムの厚みは、該タッチパネルに接続されるフレキシブル・プリント回路と同等の厚みであるため、ＰＥＴフィルムが、保護カバーとタッチパネルとの間を所定間隔に維持するスペーサの役割を担うことが可能となり、保護カバーにＰＥＴフィルムを貼り付ける利点が、より大きくなる。 As in (4) above, a touch panel is bonded to the display panel side of the PET film, and the thickness of the PET film is equivalent to the flexible printed circuit connected to the touch panel. It becomes possible to play the role of a spacer that maintains a predetermined distance between the protective cover and the touch panel, and the advantage of sticking the PET film to the protective cover becomes larger.
本発明に係る表示装置について、以下に詳細に説明する。図１は、本発明の表示装置の一例を示す断面図である。 The display device according to the present invention will be described in detail below. FIG. 1 is a cross-sectional view showing an example of the display device of the present invention.
本発明に係る表示装置の一例としては、図１に示すように、液晶表示パネルＬＣＤと該液晶表示パネルの背面に配置されるバックライトＢＬとを有している。液晶表示パネルＬＣＤとバックライトＢＬはモールドフレームＭＤの内部に収容されている。 As an example of the display device according to the present invention, as shown in FIG. 1, it has a liquid crystal display panel LCD and a backlight BL arranged on the back surface of the liquid crystal display panel. The liquid crystal display panel LCD and the backlight BL are accommodated in the mold frame MD.
また、液晶表示パネルＬＣＤの前面（図の上方）には、保護カバーＦＷが配置されている。保護カバーＦＷは、携帯電話や携帯情報端末を利用する際に、表示装置に外部から入射する外光が表示パネルの表面で反射し、表示パネルの画像表示が見え難くなるのを防止するため、外光の反射を低減する機能を有している。また、表示パネルＬＣＤに外圧や衝撃が加わるのを防止する機能もある。通常、保護カバーはガラス材料で形成される。 Further, a protective cover FW is disposed on the front surface (upper side of the drawing) of the liquid crystal display panel LCD. The protective cover FW prevents external light incident on the display device from being reflected on the surface of the display panel when the mobile phone or the portable information terminal is used, and prevents the image display on the display panel from becoming difficult to see. It has a function of reducing reflection of outside light. In addition, the display panel LCD has a function of preventing external pressure and impact from being applied. Usually, the protective cover is formed of a glass material.
保護カバーＦＷの表示パネルＬＣＤ側（保護カバーの下側）には、塗料を塗布することで、黒枠の印刷マスクＰＭが形成されている。印刷マスクは、後述のように重ね塗りされており、特にバックライトの照明光が表示パネルの周囲から漏出するのを抑制するため、表示パネルの周囲では遮光性が高くなるよう設定されている。 A black frame printing mask PM is formed on the display panel LCD side (the lower side of the protective cover) of the protective cover FW by applying paint. The print mask is overcoated as will be described later, and in particular, the light shielding property is set to be high around the display panel in order to prevent the illumination light of the backlight from leaking out from the periphery of the display panel.
さらに、保護カバーＦＷの表示パネルＬＣＤ側には、接着剤ＡＤ１によりＰＥＴフィルム（ＰＥＴ）が貼り付けられている。このＰＥＴフィルムを貼り付ける目的としては、（１）保護カバーの飛散防止、（２）表示パネルの偏光板から出た直線偏光を円偏光にする位相差板の役割、また、後述するように、（３）タッチパネルに接続されるフレキシブル・プリント回路の厚みを補うスペーサ機能などがある。 Further, a PET film (PET) is adhered to the display panel LCD side of the protective cover FW with an adhesive AD1. For the purpose of pasting this PET film, (1) prevention of scattering of the protective cover, (2) the role of the retardation plate that makes the linearly polarized light emitted from the polarizing plate of the display panel circularly polarized, and as described later, (3) There is a spacer function that compensates for the thickness of the flexible printed circuit connected to the touch panel.
また、図１では、ＰＥＴフィルムの表示パネルＬＣＤ側に、タッチパネルＴＰが接着剤ＡＤ２により貼り付けられている。タッチパネルＴＰは、表示装置を組み込む携帯電話や携帯情報端末を操作する入力手段として機能する。 In FIG. 1, the touch panel TP is attached to the display panel LCD side of the PET film with an adhesive AD2. The touch panel TP functions as an input means for operating a mobile phone or a portable information terminal incorporating the display device.
本発明に係る表示装置の主な目的は、図２に示すような気泡１の発生を効果的に抑制することである。図２は、図１の点線で示した領域Ａの一部を拡大して示す図であり、タッチパネルＴＰの構成は、省略されている。 The main purpose of the display device according to the present invention is to effectively suppress the generation of bubbles 1 as shown in FIG. FIG. 2 is an enlarged view of a part of the region A indicated by the dotted line in FIG. 1, and the configuration of the touch panel TP is omitted.
印刷マスクＰＭなどの保護カバーに印刷された領域の周辺部には、ＰＥＴフィルム（ＰＥＴ）を貼り付けると、図２のような気泡１が発生しやすい。これは、印刷を重ね塗りした場合に段差部が形成されるのが原因であること、さらに、この段差部の幅Ｓを調整することで、この気泡が抑制できることを、本発明者は見出した。 When a PET film (PET) is attached to the periphery of a region printed on a protective cover such as the printing mask PM, bubbles 1 as shown in FIG. 2 are likely to be generated. The present inventor has found that this is caused by the formation of a step when the printing is overcoated, and that the bubbles can be suppressed by adjusting the width S of the step. .
一例として、約５０μｍの厚みを有するＰＥＴフィルムを、ガラス材料で構成された保護カバーに接着剤で貼り付けた場合、気泡の発生状況は表１のように変化する。ただし、接着剤の厚みを約５０μｍとし、印刷の厚みも１回毎に約１０μｍの厚みが形成され、２回の重ね塗りを行った。気泡の発生状態は目視で観察し、気泡が観察されるものを×、気泡が観察されないものを○で評価した。 As an example, when a PET film having a thickness of about 50 μm is attached to a protective cover made of a glass material with an adhesive, the state of generation of bubbles changes as shown in Table 1. However, the thickness of the adhesive was about 50 μm, and the thickness of the printing was about 10 μm each time, and two times of overcoating were performed. The bubble generation state was visually observed, and the case where bubbles were observed was evaluated as x, and the case where bubbles were not observed was evaluated as ◯.
表１に示すように、幅Ｓが大きくなるに従い、気泡の発生が抑制されていることが容易に理解できる。特に、印刷による段差部の幅Ｓが０．５ｍｍ以上とした場合には、気泡が全く残らなかった。この技術を用いて、印刷マスクを形成し、段差部の幅Ｓを０．５ｍｍ以上とした場合には、表示パネルの表示領域を画定する印刷マスクの近傍に気泡が観察されず、表示領域の周囲には印刷マスク（黒枠）のみが存在し、極めて高品質な表示装置を提供することができた。 As shown in Table 1, it can be easily understood that the generation of bubbles is suppressed as the width S increases. In particular, when the width S of the stepped portion by printing was 0.5 mm or more, no bubbles remained. When a print mask is formed using this technique and the width S of the stepped portion is 0.5 mm or more, bubbles are not observed in the vicinity of the print mask that defines the display area of the display panel, and the display area Only a printing mask (black frame) is present in the surrounding area, and an extremely high quality display device can be provided.
図３は、ＰＥＴフィルム（ＰＥＴ）にタッチパネルＴＰを貼り付けた様子を示す図である。タッチパネルＴＰには、電気接続部ＡＤ３を介してフレキシブル・プリント回路ＦＰＣが接続されている。このようなタッチパネルＴＰを保護カバーＦＷに直接貼り付けると、フレキシブル・プリント回路ＦＰＣの厚みで、タッチパネルと保護カバーとの間隔を平行に保持できず、両者の間隔を所定の距離に保持することができない。これは、タッチパネルＴＰの操作性（感度）が低下したり、表示パネルが表示する画像の劣化の原因ともなる。 FIG. 3 is a diagram illustrating a state in which the touch panel TP is attached to a PET film (PET). A flexible printed circuit FPC is connected to the touch panel TP via an electrical connection part AD3. When such a touch panel TP is directly attached to the protective cover FW, the distance between the touch panel and the protective cover cannot be maintained in parallel with the thickness of the flexible printed circuit FPC, and the distance between the two can be maintained at a predetermined distance. Can not. This causes a decrease in operability (sensitivity) of the touch panel TP and deterioration of an image displayed on the display panel.
このため、ＰＥＴフィルム（ＰＥＴ）の厚みをフレキシブル・プリント回路ＦＰＣと同等とすることで、フレキシブル・プリント回路ＦＰＣが存在してもＰＥＴフィルムがスペーサの役割を果たし、保護カバーＦＷとタッチパネルＴＰとの間を所定距離に保持することができる。 For this reason, by making the thickness of the PET film (PET) equivalent to that of the flexible printed circuit FPC, even if the flexible printed circuit FPC exists, the PET film serves as a spacer, and the protective cover FW and the touch panel TP The gap can be kept at a predetermined distance.
図３のようにタッチパネルＴＰを保護カバーＦＷに貼り付ける場合でも、図２と同様に、重ね塗りで形成される印刷の厚さを調整し、印刷の段差部の幅Ｓを０．５ｍｍ以上とすることで、ＰＥＴフィルムを接着剤ＡＤ１で貼り付けた際の気泡発生を効果的に抑制することが可能となる。 Even when the touch panel TP is affixed to the protective cover FW as shown in FIG. 3, the thickness of printing formed by overcoating is adjusted and the width S of the stepped portion of printing is set to 0.5 mm or more as in FIG. 2. By doing so, it becomes possible to effectively suppress the generation of bubbles when the PET film is attached with the adhesive AD1.
以上のように、本発明によれば、保護カバーに印刷を施し、該印刷した面にＰＥＴフィルムを貼り付けた場合でも、印刷した領域の近傍に気泡が残ることを抑制することが可能な表示装置を提供することが可能となる。 As described above, according to the present invention, even when printing is performed on the protective cover and a PET film is pasted on the printed surface, it is possible to prevent bubbles from remaining in the vicinity of the printed region. An apparatus can be provided.
ＡＤ１，ＡＤ２ 接着剤
ＡＤ３ 電気接続部
ＢＬ バックライト
ＦＰＣ フレキシブル・プリント回路
ＦＷ 保護カバー
ＬＣＤ 液晶表示パネル
ＭＤ モールド
ＰＥＴ ＰＥＴフィルム
ＰＭ 印刷マスク
ＴＰ タッチパネル
AD1, AD2 Adhesive AD3 Electrical connection part BL Backlight FPC Flexible printed circuit FW Protective cover LCD Liquid crystal display panel MD Mold PET PET film PM Print mask TP Touch panel
Claims (4)
該保護カバーの該表示パネル側の一部領域には印刷が施され、
さらに、ＰＥＴフィルムが、該印刷された領域に少なくとも掛かるように該保護カバーに貼り付けられており、
該印刷は、重ね塗りで形成される印刷の厚さが異なる段差部を有し、該段差部の幅が０．５ｍｍ以上であることを特徴とする表示装置。 In a display device having a display panel and a protective cover disposed on the front surface of the display panel,
Printing is performed on a part of the protective cover on the display panel side,
Further, a PET film is affixed to the protective cover so as to at least cover the printed area,
The printing device has a stepped portion having a different thickness of printing formed by overcoating, and the width of the stepped portion is 0.5 mm or more.
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Cited By (39)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011022523A (en) * | 2009-07-21 | 2011-02-03 | Nippon Seiki Co Ltd | Display device |
| JP2011138099A (en) * | 2009-12-03 | 2011-07-14 | Sony Corp | Liquid crystal display device |
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