JP5575371B2 - Liquid crystal display element - Google Patents

Liquid crystal display element Download PDF

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JP5575371B2
JP5575371B2 JP2008038587A JP2008038587A JP5575371B2 JP 5575371 B2 JP5575371 B2 JP 5575371B2 JP 2008038587 A JP2008038587 A JP 2008038587A JP 2008038587 A JP2008038587 A JP 2008038587A JP 5575371 B2 JP5575371 B2 JP 5575371B2
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wall
area
liquid crystal
substrate
crystal display
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JP2009198655A (en
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優一 桃井
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エルジー ディスプレイ カンパニー リミテッド
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • G02F1/13394—Gaskets; Spacers; Sealing of cells spacers regularly patterned on the cell subtrate, e.g. walls, pillars

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Description

この発明は液晶表示素子、特に携帯電話用等の小型の液晶表示素子に有効な、表示領域面積の拡張に関する。   The present invention relates to expansion of a display area area that is effective for a liquid crystal display element, particularly a small liquid crystal display element for a cellular phone or the like.

従来、液晶表示素子の一対の基板間の接着に関し、粘着性スペーサを使用したものが開示されている。その液晶表示素子では、フォトリソグラフィ(以下フォトリソ)工程によって形成されたカラムスペーサに粘着性を持たせることを特徴としており、重力ムラや指押しに対して効果がある。その際、表示領域の外側周縁の額縁領域には、接着シール材を塗布して粘着性を持たせている(例えば特許文献１参照)。   Conventionally, an adhesive using a sticky spacer has been disclosed for bonding between a pair of substrates of a liquid crystal display element. The liquid crystal display element is characterized in that a column spacer formed by a photolithography (hereinafter referred to as photolithography) process has an adhesive property, and is effective for uneven gravity and finger pressing. At that time, an adhesive sealant is applied to the frame region on the outer peripheral edge of the display region to provide adhesiveness (see, for example, Patent Document 1).

また従来、フォトリソ工程によってカラムスペーサと同時に表示領域の外側周縁の額縁領域にウォールを形成し、カラムスペーサとウォールに粘着性を持たせることで、接着シール材の代わりにウォールと対向基板(ガラス基板)を接着させたものがある(例えば特許文献２参照)。   Conventionally, a wall is formed in the frame region at the outer peripheral edge of the display region simultaneously with the column spacer by a photolithography process, and the column spacer and the wall are made sticky, so that the wall and the counter substrate (glass substrate) can be used instead of the adhesive sealant. ) Are bonded (for example, see Patent Document 2).

特開２００４−１２７７２号公報JP 2004-12772 A 特開２００６−３３７８２０号公報JP 2006-337820 A

従来の特許文献１の技術においては、液晶表示素子の表示領域の外側周縁に接着シール材を塗布することで一対の基板(ＴＦＴ基板とＣＦ基板)を接着させている。そのため、額縁領域を狭くして表示領域の面積を拡張させるには接着シール材の塗布精度を上げ、シール幅を狭くしなくてはならない。しかしながら接着シール材塗布は接着シール材がディスペンサを用いて塗布され、その後の張り合わせ工程で接着させているため、原理的に接着シール材の幅や塗布位置の制御を現行以上に大幅に改善することは難しい。   In the prior art of Patent Document 1, a pair of substrates (TFT substrate and CF substrate) are bonded by applying an adhesive seal material to the outer periphery of the display area of the liquid crystal display element. Therefore, in order to narrow the frame area and expand the area of the display area, it is necessary to increase the application accuracy of the adhesive seal material and to narrow the seal width. However, since the adhesive sealant is applied using a dispenser and bonded in the subsequent bonding process, in principle, the control of the width and application position of the adhesive sealant is greatly improved over the current level. Is difficult.

また、接着シール材が表示領域に近付き過ぎて、表示領域に入ってしまうと表示不良になってしまうため、接着シール材幅や塗布位置のバラツキまで考慮に入れて、額縁領域を余裕を持って広い幅で確保する必要がある。   In addition, if the adhesive sealant gets too close to the display area and enters the display area, it will cause a display failure.Therefore, the frame area should be taken into account, taking into account variations in the adhesive sealant width and application position. It is necessary to secure a wide width.

また、特許文献２のようにフォトリソ工程を用いてカラムスペーサとウォールを同時に形成してそれぞれに接着機能を持たせる場合、フォトリソ工程では寸法精度良くカラムスペーサやウォールが形成可能なため、ウォールの幅を狭くすればそれだけ表示領域の外側周縁の額縁領域を狭くすることが可能となるが、その分、ウォールでの基板との接着面積が減るため接着力が低下してしまう。もしウォールを形成する領域を表示に悪影響を与えることなく表示領域内に拡張させることができれば、表示領域を拡張してもウォールの機械的強度や接着力の低下は回避できる。   Further, when the column spacer and the wall are formed at the same time by using the photolithography process as in Patent Document 2 and each has an adhesion function, the column spacer and the wall can be formed with high dimensional accuracy in the photolithography process. However, the frame area at the outer peripheral edge of the display area can be narrowed accordingly. However, the adhesion area with the substrate on the wall is reduced accordingly, and the adhesive force is reduced. If the area in which the wall is formed can be expanded within the display area without adversely affecting the display, a reduction in the mechanical strength and adhesive strength of the wall can be avoided even if the display area is expanded.

この発明は上記のような状況を考慮して、面積が限られた基板上で、ウォールの機械的強度や接着力を維持しながら、表示領域を最大限に拡張可能にした液晶表示素子を提供することを目的とする。   In consideration of the above situation, the present invention provides a liquid crystal display element capable of maximizing the display area while maintaining the mechanical strength and adhesive strength of a wall on a substrate having a limited area. The purpose is to do.

この発明は、少なくとも一方が透明である一対の基板を有し、前記一対の基板の一方の基板上の表示領域に形成されたカラムスペーサ、一対の基板間に液晶を封止するために前記表示領域の外側周縁の額縁領域に沿って形成されたウォール、及び前記ウォ−ルの内側近傍の表示領域内に形成された前記ウォ−ルでの機械的強度及び接着力を補う少なくとも１つの補償ウォ−ルのそれぞれの上部面と、対向する基板とが接着剤により接着され、前記対向する基板が前記一方の基板に対応した各領域を有し、前記表示領域が面積が周囲に拡張され、前記額縁領域及びウォ−ルが、前記表示領域の面積を拡張しない場合に対して、表示領域の拡張分、周囲方向に沿った幅が狭くされており、前記各補償ウォ−ルが幅が狭くされた前記ウォ−ルの機械的強度及び接着力を補うことを特徴とする液晶表示素子にある。 The present invention includes a pair of substrates at least one of which is transparent, a column spacer formed in a display region on one of the pair of substrates, and the display for sealing liquid crystal between the pair of substrates. At least one compensation wall that compensates for the mechanical strength and adhesive strength of the wall formed along the frame region on the outer periphery of the region and the wall formed in the display region near the inside of the wall. -Each upper surface of the base plate and the opposing substrate are bonded with an adhesive, the opposing substrate has each region corresponding to the one substrate, and the display region has an area expanded to the periphery, In contrast to the case where the frame area and the wall do not expand the area of the display area, the width along the peripheral direction is narrowed by the expansion of the display area, and the width of each compensation wall is narrowed. The wall machine In the liquid crystal display element characterized by supplementing the strength and adhesion.

この発明では、面積が限られた基板上で、ウォールの機械的強度や接着力を維持しながら、表示領域を最大限に拡張可能にした液晶表示素子を提供できる。   According to the present invention, it is possible to provide a liquid crystal display element in which the display area can be expanded to the maximum while maintaining the mechanical strength and adhesive strength of the wall on a substrate having a limited area.

実施の形態１．
図１はこの発明の一実施の形態による液晶表示素子の構成を示す断面図、図２は図１の上側の基板２を取り外した状態の下側の基板１の基板端部の部分上面図(図１の上方から見た図)である。図１は図２のＸ−Ｘ線に沿った断面図である。両図において、基板１，２は少なくとも一方が透明である液晶表示素子の両主面を形成する一対の基板であり、例えば複数の表示素子パターンが形成されたＴＦＴ(Thin Film Transistor)ガラス基板とＣＦ(カラーフィルタ)基板からなる。基板１の基板上の多数の画素領域Ｃがマトリックス状に形成されている表示領域Ａには、多数のカラムスペーサ３が画素領域Ｃと画素領域Ｃの間の画素間領域Ｄに形成されている。 Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a configuration of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a partial top view of a substrate end portion of a lower substrate 1 with the upper substrate 2 of FIG. It is the figure seen from the upper part of FIG. FIG. 1 is a cross-sectional view taken along line XX in FIG. In both figures, substrates 1 and 2 are a pair of substrates that form both main surfaces of a liquid crystal display element, at least one of which is transparent, such as a TFT (Thin Film Transistor) glass substrate on which a plurality of display element patterns are formed, and It consists of a CF (color filter) substrate. In the display area A in which a large number of pixel areas C on the substrate 1 are formed in a matrix, a large number of column spacers 3 are formed in the inter-pixel area D between the pixel areas C. .

また一対の基板１，２間に液晶５を封止するために表示領域Ａの外側周縁の額縁領域Ｂに沿ってウォール４、及びウォ−ル４の内側近傍の表示領域Ａ内にウォ−ル４での機械的強度及び接着力を補う少なくとも１つの補償(補助)ウォ−ル４ａが形成されている。これらの各補償ウォ−ル４ａは、表示不良が発生しないように、基板１の表示領域Ａの画素間領域Ｄに沿ってそれぞれ形成され、かつ図１，２で示す例ではウォ−ル４と一体に形成されている。なお補償ウォ−ル４ａは実質的にはウォ−ル４の全長に沿って所望の数の画素間領域Ｄおきに形成されることが望ましい。   Further, in order to seal the liquid crystal 5 between the pair of substrates 1 and 2, the wall 4 along the frame region B on the outer peripheral edge of the display region A and the wall 4 in the display region A near the inner side of the wall 4. 4, at least one compensating (auxiliary) wall 4a is formed which compensates for the mechanical strength and the adhesive strength. Each of these compensation walls 4a is formed along the inter-pixel region D of the display region A of the substrate 1 so that display defects do not occur, and in the example shown in FIGS. It is integrally formed. It is desirable that the compensation wall 4a is formed every other desired number of inter-pixel regions D along the entire length of the wall 4.

そして、各カラムスペーサ３、ウォ−ル４、及び各補償ウォ−ル４ａのそれぞれの上部面と、対向する基板２とが接着剤１３により接着されている。基板２は基板１に対応した各領域を有する。   The upper surfaces of the column spacers 3, the walls 4, and the compensation walls 4 a and the opposing substrate 2 are bonded by an adhesive 13. The substrate 2 has areas corresponding to the substrate 1.

図３には図２に対応する従来の液晶表示素子の場合の下側の基板１の基板端部の部分上面図を示す。図３の額縁領域Ｂ及びウォ−ル４の基板中心から外側に向かう周囲方向(基板面の縦又は横方向)の幅Ｗ１に比べ、図２のウォ−ル４及び額縁領域Ｂの周囲方向の幅Ｗ２は狭く(短く)されている。これにより同一の基板であれば、ウォ−ル４及び額縁領域Ｂの幅が狭くされた分、表示領域Ａの面積を周囲方向に拡張することができる。言い換えれば、表示領域Ａの面積が周囲方向に拡張され、ウォ−ル４及び額縁領域Ｂが表示領域Ａの拡張に従って周囲方向に沿った幅が狭くされている。しかしながら、各補償ウォ−ル４ａにより幅が狭くされたウォ−ル４の機械的強度及び接着力が補われており、液晶表示素子の機械的強度は保たれている。すなわち各補償ウォ−ル４ａは、幅が狭くされたウォ−ル４の機械的強度及び接着力を補うための寸法を有する。   FIG. 3 shows a partial top view of the substrate end portion of the lower substrate 1 in the case of the conventional liquid crystal display element corresponding to FIG. Compared to the width W1 in the peripheral direction (vertical or horizontal direction of the substrate surface) of the frame region B and the wall 4 in FIG. 3 outward from the substrate center, the peripheral direction of the wall 4 and the frame region B in FIG. The width W2 is narrow (short). Thus, if the same substrate is used, the area of the display area A can be expanded in the peripheral direction by the width of the wall 4 and the frame area B being narrowed. In other words, the area of the display area A is expanded in the peripheral direction, and the width of the wall 4 and the frame area B along the peripheral direction is reduced according to the expansion of the display area A. However, the mechanical strength and adhesive strength of the wall 4 whose width is narrowed by each compensation wall 4a are supplemented, and the mechanical strength of the liquid crystal display element is maintained. That is, each compensation wall 4a has dimensions for compensating for the mechanical strength and adhesive force of the wall 4 having a narrow width.

なお、図１，２では、各補償ウォ−ル４ａがウォ−ル４に一体に形成されている例を示したが、図４に示すように、各補償ウォ−ル４ａをウォ−ル４と分離して基板１上に形成されていてもよい。また、各補償ウォ−ル４ａは更にそれぞれに幾つかに分割された形状のものであってもよい。   1 and 2 show an example in which each compensation wall 4a is formed integrally with the wall 4. However, as shown in FIG. 4, each compensation wall 4a is connected to the wall 4 as shown in FIG. And may be formed on the substrate 1 separately. Each compensation wall 4a may be further divided into several parts.

また、液晶表示素子の製造方法について簡単に説明すると、まず、上述のように表示領域の面積が拡張され、その分、幅が狭くされた額縁領域が形成された一対の基板１，２を準備する。次に一方の基板、例えばＴＦＴ基板である基板１にフォトリソによりカラムスペーサ３，ウォール４，及び補償ウォール４ａをそれぞれの領域に形成する。次に、セル工程にてラビング終了後に、カラムスペーサ３，ウォール４，及び補償ウォール４ａのそれぞれの上部面に接着性を持たせて、すなわち接着剤１３を付けて対向する基板２を重ね合わせ、お互いの基板１，２を接着させる。   A method for manufacturing a liquid crystal display element will be briefly described. First, a pair of substrates 1 and 2 are prepared in which the area of the display region is expanded as described above and a frame region with a correspondingly narrow width is formed. To do. Next, the column spacer 3, the wall 4, and the compensation wall 4a are formed in each region by photolithography on one substrate, for example, the substrate 1 which is a TFT substrate. Next, after completion of the rubbing in the cell process, the upper surfaces of the column spacer 3, the wall 4, and the compensation wall 4a are made to have adhesiveness, that is, the opposite substrates 2 with the adhesive 13 attached are overlapped, The substrates 1 and 2 are bonded together.

フォトリソ工程は数十μｍ程度の精度でパターン形成する能力をもっているため、シール塗布工程による接着エリアの制御より遙かに高い精度で幅や位置を制御できる。そのために、ウォール４を表示領域Ａに近づけて形成することも可能となり、ウォール４及び額縁領域を狭く形成し、その分、表示領域の面積を拡張させられる。また、表示領域の画素パターン、すなわち表示領域の画素間領域に合わせて補償ウォール４ａを表示に影響を与えることなく形成することが可能となる。これにより、補償ウォール４ａを配置、個数、寸法を選択して形成することで、幅の狭くされたウォール４の機械的強度、接着力を構造上の自由度を持って補うことができる。   Since the photolithography process has the ability to form a pattern with an accuracy of about several tens of μm, the width and position can be controlled with much higher accuracy than the control of the bonding area by the seal coating process. For this reason, the wall 4 can be formed close to the display area A, and the wall 4 and the frame area are formed narrow, and the area of the display area can be expanded correspondingly. Also, the compensation wall 4a can be formed without affecting the display in accordance with the pixel pattern of the display area, that is, the inter-pixel area of the display area. Thus, by forming the compensation wall 4a by selecting the arrangement, number, and dimensions, the mechanical strength and adhesive strength of the narrowed wall 4 can be compensated with a degree of structural freedom.

この発明の一実施の形態による液晶表示素子の構成を示す断面図である。It is sectional drawing which shows the structure of the liquid crystal display element by one Embodiment of this invention. 図１の上側の基板を取り外した状態の下側の基板の基板端部の部分上面図である。It is a partial top view of the board | substrate edge part of the lower board | substrate of the state which removed the upper board | substrate of FIG. 従来の液晶表示素子の図２に相当する図である。It is a figure equivalent to FIG. 2 of the conventional liquid crystal display element. この発明による液晶表示素子の変形例を示す図１の上側の基板を取り外した状態の下側の基板の基板端部の部分上面図である。FIG. 7 is a partial top view of the substrate end portion of the lower substrate with the upper substrate of FIG. 1 removed showing a modification of the liquid crystal display element according to the present invention.

符号の説明Explanation of symbols

１，２ 基板、３ カラムスペーサ、４ ウォール、４ａ 補償(補助)ウォール、５ 液晶、１３ 接着剤、Ａ 表示領域、Ｂ 額縁領域、Ｃ 画素領域、Ｄ 画素間領域。   1, 2 substrate, 3 column spacer, 4 wall, 4a compensation (auxiliary) wall, 5 liquid crystal, 13 adhesive, A display area, B frame area, C pixel area, D inter pixel area.

Claims (4)

少なくとも一方が透明である一対の基板を有し、前記一対の基板の一方の基板上の表示領域に形成されたカラムスペーサ、一対の基板間に液晶を封止するために前記表示領域の外側周縁の額縁領域に沿って形成されたウォール、及び前記ウォ−ルの内側近傍の表示領域内に形成された前記ウォ−ルでの機械的強度及び接着力を補う少なくとも１つの補償ウォ−ルのそれぞれの上部面と、対向する基板とが接着剤により接着され、前記対向する基板が前記一方の基板に対応した各領域を有し、前記表示領域が面積が周囲に拡張され、前記額縁領域及びウォ−ルが、前記表示領域の面積を拡張しない場合に対して、表示領域の拡張分、周囲方向に沿った幅が狭くされており、前記各補償ウォ−ルが幅が狭くされた前記ウォ−ルの機械的強度及び接着力を補うことを特徴とする液晶表示素子。 A pair of substrates at least one of which is transparent, a column spacer formed in a display region on one of the pair of substrates, and an outer peripheral edge of the display region for sealing liquid crystal between the pair of substrates Each of at least one compensation wall that compensates for the mechanical strength and adhesive strength of the wall formed along the frame region of the wall and the wall formed in the display region near the inside of the wall. And the opposing substrate has an area corresponding to the one substrate, the display area is expanded to the periphery, and the frame area and the wall are opposed to each other. In contrast to the case where the display area does not expand the area of the display area, the width along the peripheral direction is narrowed by the expansion of the display area, and each of the compensation walls is narrowed. Mechanical strength and contact The liquid crystal display element characterized by supplementing the force. 前記各補償ウォ−ル部が、前記基板の表示領域の画素間領域に沿って形成されていることを特徴とする請求項１に記載の液晶表示素子。   2. The liquid crystal display element according to claim 1, wherein each of the compensation wall portions is formed along an inter-pixel region of a display region of the substrate. 前記各補償ウォ−ル部が、前記ウォ−ルに一体に形成されていることを特徴とする請求項１または２に記載の液晶表示素子。   3. The liquid crystal display element according to claim 1, wherein each of the compensation wall portions is formed integrally with the wall. 前記各補償ウォ−ル部が、前記ウォ−ルと分離して形成されていることを特徴とする請求項１または２に記載の液晶表示素子。   3. The liquid crystal display element according to claim 1, wherein each of the compensation wall portions is formed separately from the wall.
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