WO2002069033A1 - Unité d'affichage à cristaux liquides et procédé de production - Google Patents

Unité d'affichage à cristaux liquides et procédé de production Download PDF

Info

Publication number
WO2002069033A1
WO2002069033A1 PCT/JP2002/001752 JP0201752W WO02069033A1 WO 2002069033 A1 WO2002069033 A1 WO 2002069033A1 JP 0201752 W JP0201752 W JP 0201752W WO 02069033 A1 WO02069033 A1 WO 02069033A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
substrates
crystal display
pair
display device
Prior art date
Application number
PCT/JP2002/001752
Other languages
English (en)
Japanese (ja)
Inventor
Hiromi Fukumori
Hirohide Fukumoto
Hideaki Ishii
Tomonori Konya
Original Assignee
Sony Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Corporation filed Critical Sony Corporation
Publication of WO2002069033A1 publication Critical patent/WO2002069033A1/fr

Links

Classifications

    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
    • G02F1/133784—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by rubbing

Definitions

  • the present invention relates to a liquid crystal display device, and in particular, to a liquid crystal display device that realizes high-definition and high-contrast display by performing a rubbing process using a buff material having a specific size.
  • a liquid crystal display device that realizes high-definition and high-contrast display by performing a rubbing process using a buff material having a specific size.
  • a switching element such as a thin film transistor (TFT)
  • TFT thin film transistor
  • FIG. 2 is a schematic plan view of the liquid crystal cell 100
  • FIG. 3 is an enlarged plan view of the liquid crystal cell 100 as viewed from above.
  • the liquid crystal cell 100 is continuously twisted approximately 90 ° between the upper and lower substrates 1 and 2 between the upper substrate 1 and the lower substrate 2 composed of two transparent glass substrates disposed to face each other. Twisted nematic liquid crystal 3 is enclosed (TN-LCD). The outside of the liquid crystal cell 100 is sandwiched between two polarizers (not shown).
  • a transparent common electrode 4 is provided on the lower surface of the upper substrate 1, and its surface is covered with an alignment film 5.
  • a large number of pixel electrodes 6 are provided on the upper surface of the lower substrate 2, and the surface thereof is covered with an alignment film 7.
  • each pixel electrode 6 is connected to a switching element (not shown) such as TFT or the like, and scanning lines and signal lines (not shown) arranged in a matrix.
  • the alignment films 5 and 7 of the upper and lower substrates 1 and 2 are rubbed in directions perpendicular to each other. That is, the upper substrate 1 is rubbed in the direction of arrow A in FIG. 3, and the lower substrate 2 is rubbed in the direction of arrow B in FIG.
  • a buff cloth 21 is wound around the outer periphery of the roller 20 and fixed with an adhesive tape or the like.
  • the applied buff material 22 is moved along the orientation direction indicated by the arrow X in FIG. 4 while applying a predetermined pressure on the substrates 1 and 2 on which the alignment film is applied, and the buff material 22 itself is also rotated by a predetermined rotation. The rotation is performed in the direction indicated by the arrow Y in FIG.
  • the signal lines, the scanning lines, and the auxiliary capacitance electrodes as shown in Fig. 2 are used to maintain a predetermined interval between the alignment films of the upper and lower substrates 1 and 2 and improve the display quality.
  • a fixed spacer 9 is arranged on a light-shielding region 8 in which a light-shielding material and the like are arranged.
  • the rubbing strength is increased by increasing the rubbing press-in amount, or light leakage is reduced by providing a light shielding material according to the position where the white spots 10 are generated. ing.
  • the rubbing strength is increased to reduce the white spot 10
  • the alignment of the liquid crystal molecules is stabilized, and the position where the white spot 10 is generated moves to the peripheral area in the pixel, so that the contrast ratio is improved.
  • the rubbing strength is increased, a part of the fixed spacer 9 disappears, and it becomes impossible to maintain a predetermined interval between the alignment films of the liquid crystal cell 100, or the fixed spacer 9 remains in the pixel.
  • image quality defects such as point defects and display irregularities occur.
  • the rubbing strength cannot be made strong enough to eliminate white spots 10.
  • TN-LCD in which the light-shielding area is reduced in order to achieve a high definition and a high aperture ratio, poor image quality due to an increase in the rubbing intensity occurs remarkably.
  • An object of the present invention is to solve the above-described problems of the conventional technology and to provide a novel liquid crystal display device.
  • Another object of the present invention is to provide a liquid crystal display device capable of reducing image quality defects due to rubbing even when the pixel pitch is reduced in order to achieve high definition and a high aperture ratio.
  • a liquid crystal display device proposed to achieve the above object includes a pair of substrates arranged to face each other, an alignment film formed on each of opposing surfaces of the pair of substrates, and a pair of substrates. And a liquid crystal sandwiched between the alignment films of a pair of substrates, and a buff material having a diameter equal to or less than the pixel pitch is provided on at least one of the alignment films. The rubbing treatment used was performed.
  • the present invention provides a pair of substrates disposed to face each other, an alignment film formed on each of the opposing surfaces of the pair of substrates, and a fixed space holding the alignment films of the pair of substrates at a predetermined interval.
  • a method for manufacturing a liquid crystal display device comprising: a liquid crystal sandwiched between alignment films of a pair of substrates, the method comprising: using a buffer material having a diameter equal to or less than a pixel pitch for at least one of the substrates. A rubbing process is performed.
  • FIG. 1 is a sectional view showing a liquid crystal cell constituting a conventional liquid crystal display device
  • FIG. 2 is a schematic plan view of the liquid crystal cell
  • FIG. FIG. 1 is a sectional view showing a liquid crystal cell constituting a conventional liquid crystal display device
  • FIG. 2 is a schematic plan view of the liquid crystal cell
  • FIG. FIG. 1 is a sectional view showing a liquid crystal cell constituting a conventional liquid crystal display device
  • FIG. 4 is a perspective view showing a general rubbing method.
  • FIG. 5 is an enlarged plan view of a liquid crystal cell included in the liquid crystal display device according to the present invention as viewed from above.
  • FIG. 6 is a sectional view showing a liquid crystal cell constituting the liquid crystal display device according to the present invention.
  • FIG. 7 shows a buffing material used to form examples and comparative examples according to the present invention. It is sectional drawing.
  • FIG. 8 is a characteristic diagram showing the relationship between the rubbing depression amount and the white spot length in the example according to the present invention and the comparative example.
  • FIG. 1 shows that the liquid crystal cell used in the liquid crystal display device according to the present invention has a configuration as shown in FIGS.
  • the liquid crystal cell 100 A used in the present invention is a TN-LCD similar to the conventional liquid crystal cell 100 shown in FIGS. 1 to 3, and two transparent glass plates arranged opposite to each other. Between the upper substrate 1 and the lower substrate 2 composed of substrates, a twisted nematic liquid crystal 3 twisted approximately 90 ° continuously between the upper and lower substrates 1 and 2 is sealed (TN-LCD).
  • the upper and lower substrates 1 and 2 constituting the liquid crystal cell 100A are provided with alignment films 5A and 7A, respectively. These alignment films 5A and 7A are rubbed in directions perpendicular to each other, as in the above-described conventional liquid crystal cell 100. That is, the upper substrate 1 is rubbed in the direction of arrow A in FIG.
  • the characteristic point is that the rubbing process for each of the alignment films 5A and 7A is performed using a buff material 22 having a diameter L equal to or less than the pixel pitch (see FIG. 4).
  • the rubbing treatment using a buff material having a diameter of less than the pixel pitch L i is performed on at least one of the alignment films on the upper and lower substrates, but a fixed spacer is formed. It is preferable to perform this rubbing treatment on the alignment film on the substrate.
  • the substrate on which rubbing treatment is performed in the active matrix type liquid crystal display device is usually a drive substrate on which a switching element such as TFT is formed.
  • the diameter of the buff material used in the present invention is preferably smaller than both the vertical pixel pitch P i and the horizontal pixel pitch P 2 , especially when the pixel pitch is 15 / zm or less. Preferably has a diameter of 5 to 15 / m.
  • the structure of the buffing material itself can be the same as the known buffing material used in the rubbing method, and a roller in which a puff cloth made of rayon fiber, filament structure or the like is wound can be used.
  • the rubbing treatment is performed by pressing the buff material against the substrate coated with the alignment film at a predetermined pressure and moving the buff material in the alignment direction while driving the buff material to rotate. Good.
  • the fixed spacer 9 may be formed on the substrate.
  • the alignment films 5A and 7A to be rubbed can be formed by coating a known alignment film material such as polyimide or polyamic acid, and the pretilt angle is not particularly limited.
  • the height of the fixed spacer 9 may be determined according to the distance between the upper and lower alignment films 5A and 7A, and is set to 4 / m or less when performing high-definition display. Is also good.
  • the fixed spacer 9 has a distribution density of 1 piece / 200 mm 2 or more! The number is preferably set to 400 m ⁇ 2 .
  • Such a fixed spacer 9 can be formed by patterning by a photolithography method using a photosensitive resin such as a photosensitive epoxy resin, a photosensitive polyimide, or a photosensitive acrylic resin.
  • the liquid crystal display device can be manufactured in the same manner as a known liquid crystal display device, except that a buff material having a diameter equal to or less than a pixel pitch is used as a buff material during the rubbing process as described above. It can be applied to a display device.
  • the present invention is not limited to a matrix type liquid crystal display device having a TFT as a switching element, but a non-linear element such as a MIM (metal-insulating film-metal) as a switching element.
  • MIM metal-insulating film-metal
  • the present invention can also be applied to a liquid crystal display device having the same.
  • the liquid crystal is not limited to the twisted nematic liquid crystal, and can be suitably applied to a liquid crystal display device using a smectic liquid crystal or the like.
  • a liquid crystal cell 100 A shown in FIG. 5 according to the present invention was manufactured as Example 1, and a conventional liquid crystal cell 100 shown in FIG. 1 described above was manufactured as Comparative Example 1.
  • a transparent common electrode 4 was formed on the upper substrate 1
  • a pixel electrode 6 having a TFT element as a switching element was formed on the lower substrate 2.
  • the pixel pitch was 15 z m for the top, bottom, and left.
  • a fixed spacer having a diameter of 3 zm is provided at the intersection of each row and every other column in the matrix-shaped light-shielding region 8, with a photosensitive resin (Optopma NN 7 100, manufactured by JSR) by patterning using photolithography (see Fig. 2).
  • Example 1 polyimide alignment films having a pretilt angle of about 5 ° were formed as the alignment films 5A and 7A of the upper and lower substrates.
  • the rubbing treatment of the alignment films 5A and 7A is as follows. Using a buff material (diameter: 10 zm) 22 wound around the roller 20 as shown in Fig. 4, adjust the rubbing strength so that the rubbing push-in amount becomes the specified value. went.
  • Comparative Example 1 For comparison, as Comparative Example 1, a similar rubbing treatment was performed using a buff material having a diameter of 18 ⁇ . As the rubbing amount, the amount of overlap of the total thickness of the buff material 22 with respect to the substrate was measured.
  • a liquid crystal cell 10OA corresponding to Example 1 was obtained by bonding the upper substrate 1 and the lower substrate 2 to face each other and sealing a left-handed nematic liquid crystal between the alignment films.
  • This liquid crystal cell 100 ⁇ is driven by a line inversion driving method in which the pixel electrodes are inverted for each row, and the length L 2 (see FIG. 3) of a white spot in the pixel section 11 is measured with a microscope. Measure with a micrometer and create a diagram of the relationship between the rubbing press-in amount and the white spot length. Was. Figure 8 shows the results.
  • Example 1 shown in FIG. 8A in which rubbing was performed using a buff material having a diameter equal to or less than the pixel pitch, in Example 1 shown in FIG. It can be seen that the white spot length is significantly shorter than that of Comparative Example 1 indicated by. INDUSTRIAL APPLICABILITY
  • the liquid crystal display device according to the present invention can significantly reduce image quality defects due to rubbing even when the pixel pitch is reduced in order to achieve high definition and high aperture ratio.

Landscapes

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

Abstract

L'invention concerne une unité d'affichage à cristaux liquides utilisant une cellule liquide (100A), qui comprend une paire de substrats (1, 2) situés l'un en face de l'autre, des films d'orientation (5A, 7A) respectivement formés sur la surface opposée de la paire de substrats, un espaceur de fixation (9) servant à retenir l'espace entre les films d'orientation de la paire de substrats à une distance spécifiée, et un cristal liquide (3) maintenu entre les films d'orientation de la paire de substrats, au moins un des films (5A, 7A) étant frotté à l'aide d'un matériau polissant (22) ayant des pas de pixel atteignant P1, P2 et un diamètre L1.
PCT/JP2002/001752 2001-02-28 2002-02-26 Unité d'affichage à cristaux liquides et procédé de production WO2002069033A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001053241A JP2002258285A (ja) 2001-02-28 2001-02-28 液晶表示装置
JP2001-53241 2001-02-28

Publications (1)

Publication Number Publication Date
WO2002069033A1 true WO2002069033A1 (fr) 2002-09-06

Family

ID=18913734

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2002/001752 WO2002069033A1 (fr) 2001-02-28 2002-02-26 Unité d'affichage à cristaux liquides et procédé de production

Country Status (2)

Country Link
JP (1) JP2002258285A (fr)
WO (1) WO2002069033A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020071371A1 (fr) * 2018-10-01 2020-04-09 大日本印刷株式会社 Substrat transparent et élément de réglage de lumière

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10333151A (ja) * 1997-05-28 1998-12-18 Matsushita Electric Ind Co Ltd アクティブマトリクス型液晶表示素子の製造方法
JP2001075114A (ja) * 1999-09-07 2001-03-23 Seiko Epson Corp 液晶装置及びその製造方法ならびにそれを用いた電子機器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10333151A (ja) * 1997-05-28 1998-12-18 Matsushita Electric Ind Co Ltd アクティブマトリクス型液晶表示素子の製造方法
JP2001075114A (ja) * 1999-09-07 2001-03-23 Seiko Epson Corp 液晶装置及びその製造方法ならびにそれを用いた電子機器

Also Published As

Publication number Publication date
JP2002258285A (ja) 2002-09-11

Similar Documents

Publication Publication Date Title
US7486366B2 (en) Liquid crystal display device and method for fabricating the same
US6829028B2 (en) Wide-viewing angle display device and fabrication method for thereof
US7880855B2 (en) LCD device and method having a ball spacer in an alignment film groove having a groove width greater than the spacer diameter and curing a seal pattern and the spacer at the same time after bonding the substrates
US8237907B2 (en) Liquid crystal display device and method of manufacturing the same
JPH11142863A (ja) 液晶表示パネルおよびその製造方法
US7414687B2 (en) Method of forming alignment layer in LCD
WO2002056103A1 (fr) Affichage a cristaux liquides et son procede de fabrication
US7916254B2 (en) Liquid crystal display apparatus for performing alignment process by irradiating light
US7714967B2 (en) Multi-domain liquid crystal display device and method for fabricating the same
US6642982B2 (en) Liquid crystal display device with orientation film having projecting edge portions and manufacturing method of the same
KR101146985B1 (ko) 표시 장치 및 이의 제조 방법
JP2002214613A (ja) 液晶表示装置
JPH11264968A (ja) 液晶表示装置
JP2000137229A (ja) 液晶表示装置
JPH09179123A (ja) 液晶表示素子及び液晶表示素子の製造方法
US7106406B2 (en) Liquid crystal displays with multi-domain effect formed by surface undulations
JP4383825B2 (ja) 液晶表示装置
WO2002069033A1 (fr) Unité d'affichage à cristaux liquides et procédé de production
JP4103207B2 (ja) 液晶表示装置
JPH0829790A (ja) 液晶表示装置
JP5852865B2 (ja) 液晶表示装置
JP4930959B2 (ja) 垂直配向型ｅｃｂ−ｌｃｄ
JP3131508B2 (ja) 液晶表示装置
US20070291218A1 (en) LCD panel and method for manufacturing the same
JP2006039069A (ja) 液晶表示装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN KR US