WO2001025844A1 - Panneau d'affichage a cristaux liquides, procedes de fabrication et d'utilisation associes - Google Patents

Panneau d'affichage a cristaux liquides, procedes de fabrication et d'utilisation associes Download PDF

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Publication number
WO2001025844A1
WO2001025844A1 PCT/JP2000/006970 JP0006970W WO0125844A1 WO 2001025844 A1 WO2001025844 A1 WO 2001025844A1 JP 0006970 W JP0006970 W JP 0006970W WO 0125844 A1 WO0125844 A1 WO 0125844A1
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WIPO (PCT)
Prior art keywords
liquid crystal
substrate
display panel
crystal display
crystal layer
Prior art date
Application number
PCT/JP2000/006970
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English (en)
Japanese (ja)
Inventor
Akinori Shiota
Katsuhiko Kumagawa
Hiroyuki Yamakita
Kazuo Inoue
Yoshinori Tanaka
Original Assignee
Matsushita Electric Industrial Co., Ltd.
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 Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to KR1020017006824A priority Critical patent/KR20010090855A/ko
Publication of WO2001025844A1 publication Critical patent/WO2001025844A1/fr

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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
    • G02F1/1341—Filling or closing of cells

Definitions

  • the present invention relates to a liquid crystal display panel used for a liquid crystal display device, an optical shutter, and the like, and particularly to an active matrix type liquid crystal display panel. More specifically, the present invention relates to an improvement to eliminate the display glare. Background technology
  • liquid crystal display panels have the advantages of thinner and lighter devices and low-voltage operation. It is widely used in personal computers, word processors, etc.
  • the operation modes of the liquid crystal panel are classified into a vertical type using a vertical electric field, v erti c a l 1 y ali g n m e n t type, and an In-p-lan e S w i c hi ng type using a horizontal electric field (hereinafter, referred to as an IPS type).
  • Fig. 12a and Fig. 12 show the configuration of the liquid crystal display panel of the vertical nematic type (hereinafter referred to as TN type) representing the vertical 1 ya 1 ignment type. Shown in b.
  • TN type liquid crystal display panel
  • an array substrate 1 provided with a source line 12, a gate line 11, a pixel electrode 14, and an active element 13.
  • the pixel electrode and the counter electrode are both made of indium tin oxide.
  • the array substrate 1 and the color filter substrate 2 are each provided with a directing film 17 made of polyimide on a surface in contact with the liquid crystal layer 7. ing .
  • the thickness of the liquid crystal layer 7 (hereinafter referred to as “cell gap”) is kept uniform by the spacers 22 disposed between the two substrates. ing .
  • FIGS 13a and 13b show the IPS-type liquid crystal display panel.
  • the IPS type liquid crystal display panel has a different electrode structure from the TN type one, in which a counter electrode 15 is disposed on an array substrate 1 on which a pixel electrode 14 is disposed. Yes. As a result, an electric field is formed in the liquid crystal layer 7 in the horizontal direction in the figure.
  • the present invention is not limited to the above-mentioned TN-type and IPS-type liquid crystal display cells, and the liquid crystal display cells include a pair of substrates and a liquid crystal layer 7 sandwiched therebetween.
  • a method for forming the liquid crystal layer 7 between these two substrates there are a vacuum injection method and a dropping method.
  • a pair of substrates (hereinafter referred to as an empty panel) which are superposed at a predetermined interval and whose peripheral edges are bonded to each other except for an opening as an injection port. ) Is brought into contact with the liquid crystal material under a reduced pressure atmosphere, and then the atmosphere is returned to normal pressure, whereby the liquid crystal material is injected between the two substrates.
  • the empty panel holds a cell gap on one of a pair of rubbed substrates, each of which has a direction-directing film formed on its surface. After spraying a spacer to spread the seal and applying a sealant to the periphery of the other substrate, the two substrates are pasted together and the seal is cured. It is produced.
  • the liquid crystal display cell can be obtained by attaching the liquid crystal display.
  • a substrate in which a spacer is dispersed on the upper surface and the other substrate on which several syringes and liquid crystal materials are dropped on the upper surface are placed under normal pressure or reduced pressure atmosphere. After bonding under ambient atmosphere, return the atmosphere to normal pressure.
  • the liquid crystal material radially diffuses from the inlet or the dropping position to the entire panel.
  • injection in the panel, in the above-described liquid crystal injection step, along the direction in which the liquid crystal material has flowed, the so-called “injection” is called “injection”.
  • the ionic impurities mixed during the injection of the liquid crystal material or the ionic impurities contained in the liquid crystal material itself may cause the liquid crystal layer to flow between the orientation film and the liquid crystal layer during the inflow. It is thought to be caused by trapping at the interface.
  • ionic impurities which are uncured components of the resin used for the sealing material, are eluted into the liquid crystal material near the injection port and are caused. There was some mulling. The portion where ions are trapped and ions are unevenly distributed due to a drop in the voltage holding ratio when the panel is driven, the display is the same as the other portions. What should I do?
  • ions are generated by irradiating a knock light or the like. Was able to adversely affect the display.
  • the IPS-type liquid crystal display panel also has another display defect problem caused by its structure.
  • the problem of pinholes is one example.
  • the IPS type path, channel, pixel electrode, a counter counter electrode, source over scan lines, the wiring of Te Gate lines, etc. to base is covered with any insulating films of S i 0 2 and S i N x Yes. If the pinhole, that is, the insulating layer is destroyed and the electrode is directly exposed to the liquid crystal layer due to foreign matter or the like, the operation at high temperature may occur. Display glare occurs in that area. For example, if a pinhole is formed on the gate line, the potential of the gate line is negative for most of the period, so that the ion in the liquid crystal layer will be negative. It is considered that display impurities may be caused because sexual impurities gather at the pinhole.
  • IPS type liquid crystal display panels In a liquid crystal display panel, a good voltage holding ratio is a particularly important item for obtaining a display.
  • the IPS type liquid crystal display panel is a display mode in which the liquid crystal near the interface contributes greatly, so it is susceptible to the ions adsorbed near the interface. It is considered to be.
  • Japanese Patent Application Laid-Open No. 7-175073 proposes a method of disposing an impurity adsorbent in the vicinity of a sealing port.
  • aluminum oxide is coated on the substrate surface near the liquid crystal enclosure to prevent the ionizable substance or low molecular weight substance from entering the liquid crystal layer.
  • Proposals have been made to install an adsorbent consisting of a coating film, and to provide a columnar body that divides the encapsulation opening and place a similar adsorbent on its surface. Yes.
  • Japanese Unexamined Patent Publication No. Hei 6-111004 discloses an ion adsorbing substance for the purpose of removing ionizable impurities that have invaded the liquid crystal layer.
  • the present invention has been made to solve the above problems, and has as its object to provide a liquid crystal display panel having a small number of display blemishes caused by injection mura. . Furthermore, the present invention aims to provide a liquid crystal display panel capable of suppressing display glare due to other factors and providing a superior display. . In the present invention, when a liquid crystal layer is formed, a projection as an obstacle is provided to control the flow of the liquid crystal and suppress the injection mura.
  • the liquid crystal display device of the present invention is arranged such that a first substrate provided with a color filter and a surface of the first substrate are spaced apart from each other by a predetermined distance.
  • At least one of the second substrates is used to control the flow of the liquid crystal material supplied when the liquid crystal layer is formed on the surface facing the other substrate.
  • the projection is provided.
  • a projection is provided near the injection port.
  • the protrusions reduce the flow velocity of the injected liquid crystal material and reduce the flow velocity, and also generate so-called turbulent flow, thus causing the flow to flow. It can be distributed.
  • the ionic impurities contained in the liquid crystal material are more uniformly dispersed, so that the influence of display defects is reduced.
  • the trapping is caused by the orientation film before reaching the region where the electrode is formed, resulting in poor display. Can be prevented.
  • the projection has a wall surface perpendicular to the direction of travel.
  • a plurality of protrusions may be formed.
  • the height of the projection is at least 1 ⁇ m, and its length is at least 1 mm.
  • the projection is not limited to a rectangular parallelepiped, and may have other shapes such as a cylinder, a cone, a truncated cone, and a polygonal pyramid.
  • the protruding portion is provided on at least one of the array substrate and the opposing substrate.
  • a known method for example, photolithography, pigment dispersion, printing, or the like
  • the same material as the color filter is used. If it is formed simultaneously with the color filter by the ink jet method, electrodeposition method, dyeing method, etc., there is no need to add new processes. Is better.
  • two or three different color filler materials different from each other are superimposed on each other or a black mask is formed. The color (light-shielding layer) and the color filter are overlapped.
  • the same material as the insulating layer and the electrode it is preferable to use, for example, the same material as the insulating layer and the electrode, and to form the same at the same time.
  • the projection may be formed after the rubbing treatment on the orientation film. It is useful to provide a plurality of regions having different distribution densities of the protrusions.
  • the protrusions are arranged in a region near the injection port with a higher distribution density than in other regions.
  • the liquid crystal material is diffused radially from the point where the liquid is dropped.
  • the distribution density of the projections in the inner area of the circle with the smallest diameter is made even higher, and the distribution density of the projections is gradually increased as the area becomes outer. Lower it.
  • one of the factors that cause mulling is leaching from a seal material arranged on the periphery of the panel. Therefore, the distribution density of the protrusions at the periphery of the substrate is made higher than that at the center of the substrate, so that when the liquid crystal material is injected, the liquid crystal material is shrunk. It reduces the speed of contact with the roll material and suppresses leaching.
  • the projection is made to correspond to the spacer. And then make it function.
  • Spherical or fibrous spacers that have been used in the past disperse to uncertain locations on the substrate, which may affect display contrast and other factors.
  • the projection provided at a preset location is used as a spacer, the display failure caused by the injection mura is eliminated. Not only that, it is also effective for improving the image quality, such as improving contrast.
  • the projection is provided with a function of removing ionic impurities contained in the liquid crystal layer, it is more effective to reduce display defects.
  • a material having a function of physically or chemically removing ion impurities such as aluminum oxide, titanium oxide, or porous glass, is formed on the protrusion.
  • Electro-adsorption of ionizable impurities by the projections is also effective.
  • a conductive protrusion is used, and this protrusion is electrically connected to a pixel electrode or a counter electrode.
  • the conductive protrusions are made of a resin in which a conductive material such as carbon particles is dispersed, a conductive resin such as a polyolefin, or a metal.
  • a projection made of a non-conductor whose surface is covered with a conductor.
  • Protrusions are formed directly on electrodes Alternatively, it may be formed on a directing film that covers the electrodes.
  • a charged portion may be provided in addition to the protrusion, and the ion adsorption capability as described above may be provided near the protrusion.
  • Protrusions may be provided.
  • the charged portion is formed, for example, by removing an insulating film covering a surface of a portion electrically connected to the electrode.
  • the protruding portion it is preferable to connect the protruding portion to the electrode directly or via an alignment film.
  • the protrusions disposed near the electrodes allow the ionizable impurities to be attracted when the voltage is applied to be adsorbed, so that the ionizable impurities can be more effectively removed. it can .
  • the distance between the projection and the electrode should preferably be 10 mm or less.
  • the difference between the heights of the concave and convex ranges from 0.0 l / m to 5 m, more preferably, 0.01 mm! ⁇ L m.
  • the projections as described above can be formed at predetermined locations by a known technique. Therefore, by providing the protrusion in the non-display area, the influence on the display can be eliminated.
  • any type of liquid crystal material such as a nematic liquid crystal, a ferroelectric liquid crystal, and an antiferroelectric liquid crystal can be used.
  • liquid crystal display cell in the operation mode of either the method of vertical orientation (vertical 1 ya 1 ignment) or the method of using horizontal electric field (in-p 1 ane-swiching). You can do it.
  • a three-terminal TFT, a two-terminal MIM (Metal-Insulator-Metal), and a ZnO noise are used as active elements. Evening, Sin x Diode, liquid crystal display panel using a_S i-Gide, etc., and TN or STN without active element formed It can be used for any type of liquid crystal display panel.
  • a glass plate As the substrate, a glass plate, a resin film, a resin plate, or the like can be used.
  • the present invention is used for a reflective liquid crystal display panel, it is permissible to use a colored film as the insulating film or the direction film. .
  • FIG. 1a is a plan view showing a liquid crystal display panel according to one embodiment of the present invention
  • FIG. Lb is a longitudinal section showing a main part of the same panel. It is a diagram.
  • FIG. 2A is a plan view showing a liquid crystal display panel according to another embodiment of the present invention
  • FIG. 2B is a longitudinal sectional view showing a main part of the panel.
  • FIG. 3 is a longitudinal sectional view showing a main part of a liquid crystal display panel according to still another embodiment of the present invention.
  • FIG. 4 is a longitudinal sectional view showing a main part of a liquid crystal display panel according to still another embodiment of the present invention.
  • FIG. 5 is a plan view showing a liquid crystal display panel according to still another embodiment of the present invention.
  • FIG. 6 is a plan view showing a liquid crystal display panel according to still another embodiment of the present invention.
  • FIG. 7 is a plan view showing a liquid crystal display panel according to still another embodiment of the present invention.
  • FIG. 8A is a plan view showing a main part of a liquid crystal display panel according to still another embodiment of the present invention, and
  • FIG. 8B is a sectional view taken along line A-A of FIG. 8A. It is.
  • FIG. 9 a is Ri Ah in the liquid crystal display Bruno 1? Ne shown to flat surfaces diagram mosquitoes La monounsaturated I le evening substrate had use Le et al in another embodiment of the present invention
  • FIG. 9 b is FIG. 3 is a plan view showing a main part of the liquid crystal display panel.
  • FIG. 10a is a plan view showing a main part of a liquid crystal display cell according to another embodiment of the present invention
  • FIG. 1013 is a plan view of FIG. A is a sectional view
  • FIG. 11 is a plan view showing a main part of a liquid crystal display panel according to still another embodiment of the present invention
  • FIG. 11b is a longitudinal sectional view of the same.
  • FIG. 12a is a plan view showing a main part of a conventional vertical electric field type liquid crystal display panel
  • FIG. 12b is a sectional view taken along line AA of FIG. 12a.
  • FIG. 13a is a plan view showing a main part of a conventional lateral electric field type liquid crystal display panel, and FIG. 13b is a longitudinal sectional view of the same. (Explanation of sign)
  • the liquid crystal display panel of this embodiment is shown in FIGS. 1a and 1b.
  • the opposite substrate 2 has a protrusion 6 having a height of 3 Aim and a width of 6 mm at a position 3 mm from the inlet 10.
  • the projection 6 is formed by using the same material when a color filter (not shown) is formed on the opposite substrate 2.
  • each of the red, green, and blue color filters is a photo-curable resin using an acrylic-based photocurable resin in which pigments are dispersed. It was formed by lithography.
  • each of the projections 6 is formed when forming a color filter. It consists of two layers. By using the projection 6 made of the same material as the color filter, the projection 6 can be formed at the same time as the color filter. There is no need to add a new process to form 6.
  • a liquid crystal display panel was manufactured as follows using the opposing substrate 2 having the projections 6.
  • the surface of the array substrate 1 provided with electrodes, wiring, etc. (not shown) on the surface, and a color filter (not shown) formed as described above, and A solution-type polyimide (SE7992: Nissan Chemical Industries, Ltd.) was applied to the surface of the opposite substrate 2 having the protrusions 6 for temporary curing. After heat treatment at 80 ° C for 1 minute, a heat treatment was performed at 220 ° C for 1 hour to form a polyimide film.
  • SE7992 Nissan Chemical Industries, Ltd.
  • the formed polyimide film is subjected to a rubbing treatment in which the liquid crystal is oriented in a specific direction by rubbing in one direction with a cloth to obtain an orientation film. Then, the substrates 1 and 2 were washed with water.
  • seal material (Structobond: manufactured by Mitsui Toatsu Chemicals Co., Ltd.) 3 is left, except for the portion that becomes the inlet 10. It was applied to the periphery of the counter substrate 2 by a printing method. In addition, a 5.0-m glass glass fin (available from Nippon Electric Glass Co., Ltd., not shown) was used as a spacer in the seal material. First, it was mixed.
  • a spacer (not shown) is used as a spacer (not shown) in the display area to hold a resin ball having a diameter of 5.
  • a conductive paste 5 was applied to the edge of the base board to electrically connect the array board 1 and the opposing board 2, and then the boards 1 and 2 were bonded together. .
  • the seal material 3 was cured, and empty cells were obtained.
  • a liquid crystal material (MT 507: manufactured by Chitz Co., Ltd.) was injected into the obtained empty panel by a vacuum injection method. That is, after bringing the inlet 10 of the empty panel into contact with the liquid crystal material under a reduced-pressure atmosphere, the atmosphere is returned to normal pressure, and the liquid crystal material is exposed to the liquid. Injected inside.
  • a light-curing resin (Lock Tight 352 A: Lock Rock Japan) is used as a sealing material 4 in the injection port 10. (Manufactured by Tit Co., Ltd.) was applied to the entirety of the inlet 10 and irradiated with light at 1 OmW / cm 2 for 5 minutes to cure the sealing material 4.
  • a polarizing plate (NPF-HEG14425DU: manufactured by Nitto Denko Corporation) was attached to the outer surfaces of the substrates 1 and 2, respectively, to obtain a liquid crystal display panel.
  • NPF-HEG14425DU manufactured by Nitto Denko Corporation
  • a cell was also made.
  • This projection 6 joins the substrates 1 and 2 together. That is, the height of the protrusion 6 is equal to the cell gap.
  • This mirror modulates a liquid crystal display cell and drives it at a lower frequency (for example, 10 Hz) than the normal driving frequency (60 Hz). Remarkably observed.
  • this muller is a component contained in the seal material, for example, a component that evaporates during curing and remains in the empty panel. It is considered to be due to the uncured component of the above and the ionic impurities contained in the seal material and dissolved out into the liquid crystal. available . Therefore, in order to more effectively suppress the occurrence of display defects, as in the present embodiment, the substrate on which the protrusions are formed is joined in advance. It is preferable to make the panel by using Incidentally, as shown in FIG. 3 b, the projection 6 may be provided on the array substrate 1. In this case, when the protrusion 6 is formed by processing the metal film or the insulator film formed in the array forming step, a new process is required for forming the protrusion 6. There is no need to obtain it.
  • the projections 8 and 6 may be provided on the substrates 1 and 2 respectively.
  • the liquid crystal material flowing into the empty panel is more effective. Since the stirring is carried out at a high speed, a greater effect can be obtained by eliminating the injection mud.
  • liquid crystal display panel of the first embodiment is further provided with a function of removing ionic impurities penetrating the liquid crystal layer 2. .
  • the protruding portion 6 is formed in the same manner as in the first embodiment, using an acrylic photocurable resin in which aluminum oxide powder is dispersed. Since the aluminum oxide adsorbs ionic impurities such as Na +, the protrusions 6 form the liquid crystal material which is likely to flow into the cell. To remove the ionic impurities contained in.
  • Example 3 an example in which a TN liquid crystal display panel is manufactured by a vacuum injection method will be described.
  • Fig. 7 shows the liquid crystal display panel of this example.
  • the same panel has a projection 6 inside the empty panel inlet 10 as in the first and second embodiments.
  • the protrusions 6 are formed at the same time as the seal material 3, and are similar to those in the liquid crystal display panels of Examples 1 and 2. Has a function.
  • a plurality of truncated cone-shaped columnar projections are provided in the non-display area.
  • This columnar projection has a height of 4.0 ⁇ m and a diameter of 20 / m.
  • the columnar protrusions are distributed at different densities in a region A in contact with the injection port 10, a region B in contact with the region A, and a region C which is another non-display region.
  • the area A one for the area corresponding to one pixel, in the area B, one for four pixels, and in the area C, one for six pixels.
  • Columnar projections are provided.
  • the columnar protrusions are arranged more densely as they approach the inlet.
  • the columnar protrusions arranged in the non-display area increase the inflow resistance when the liquid crystal material is injected, and the liquid crystal material injected further reaches the display area 8 when the liquid crystal material is injected. Make the route longer. After the injected liquid crystal material passes through the region A where the columnar protrusions are densely arranged, as shown by the arrow in the figure, the protrusion is hindered from proceeding in the ingress direction. Pass through region B and region C. Thus, the ionizable impurities contained in the liquid crystal material at the time of the injection are trapped in the orientation film in the non-display area.
  • the columnar projections are arranged at a ratio of one to nine pixels.
  • the columnar projections 8 in the display area and the columnar projections in the non-display area both have the same height as the cell gap. in this way , By disposing the columnar projections over the entire area, these columnar projections can function as a spacer.
  • the columnar projections are formed using, for example, a material for a color filter similarly to the projections in the above embodiment.
  • the columnar projections 18 in the display area are formed at positions corresponding to the gate lines 11 on the array substrate 1, for example.
  • the array substrate 1 is composed of a glass substrate 9 provided with an active element 13 and a transparent pixel electrode 14. On the surface facing the liquid crystal layer, a orientation film made of polyimide is formed.
  • the color filter substrate 2 includes a red, blue, and green color filter (not shown) as a pixel portion, and a black matrix as a light shielding portion. It consists of a glass substrate 9 provided with 16 and a transparent counter electrode 15. On the surface facing the liquid crystal layer 7, an alignment film 17 made of polyimide is formed. The counter electrode 15 is disposed so as to face the pixel electrode on the array substrate 1 with the alignment film 17 and the liquid crystal layer 7 interposed therebetween. The columnar projections 18 are formed on a black matrix 16 serving as a light-shielding portion of the power filter substrate 2.
  • the liquid crystal display panel of this embodiment is manufactured, for example, by the following method.
  • a red, green, and blue color filter 1 is provided on one side of the glass plate 9. 9 and a black matrix 16.
  • a film is formed on the color filter substrate 2 by a spin coating method. A film about 4 ⁇ m thick is formed. After pre-baking, only the portion of the obtained film where the columnar projection 18 is to be formed is exposed, and the exposed portion is exposed. The photocurable resin is cured. After the post beta, the color filter substrate 2 is etched, so that the notch of the columnar protrusion is removed from the color filter substrate 2. Leave on. Further, heat treatment is performed in an oven to form columnar projections 18.
  • the diameter of the formed columnar protrusion was set to be less than 20 ⁇ m, which is smaller than the width (25 m) of the black matrix 16.
  • a liquid crystal display panel is formed by a common method. It was made.
  • Example 4 a liquid crystal display panel having no projections and no columnar projections as described above was produced and evaluated in the same manner. As a result, display glare was observed in the panel of the comparative example, but in the case of the panel of the present example, good display was achieved without display glare.
  • Example 4 a liquid crystal display panel having no projections and no columnar projections as described above was produced and evaluated in the same manner. As a result, display glare was observed in the panel of the comparative example, but in the case of the panel of the present example, good display was achieved without display glare.
  • Example 5 a paste obtained by dispersing fine particles of aluminum oxide carrying nickel into the photocurable resin used in Example 3 was used.
  • a columnar projection 18 was formed.
  • the nickel-supported aluminum oxide used here was dried at 230 ° C after drying the aluminum oxide powder immersed in an aqueous nickel acetate solution. It was oxidized and further reduced by hydrogen.
  • Aluminum oxide is not ionizable such as Na + Absorbs pure substances.
  • Nickel promotes the adsorption of aluminum oxide by the action of a catalyst. Accordingly, the columnar projections 18 can remove ionizable impurities contained in the liquid crystal material that is likely to flow into the voids and the cells. . Therefore, display defects can be more effectively reduced as compared with the liquid crystal display panel of the third embodiment.
  • Example 5 Example 5
  • the circular areas A, B, and C of the color filter substrate 2 are arranged around the point where the liquid crystal material is dripped.
  • columnar projections 18 were formed at different densities.
  • a circular area A having a radius of 3 cm including the liquid crystal material dropping position columnar projections 18 were formed at a rate of one per pixel.
  • a region B having an outer radius of 6 cm surrounding the region A a columnar projection 18 is formed at a rate of one for every three pixels, and a radius of the outer periphery surrounding the columnar projection 18 is formed.
  • columnar projections 18 were formed at a rate of one per six pixels.
  • columnar projections 18 were formed at a ratio of one for every nine pixels. That is, the columnar projections 18 are arranged such that the arrangement density of the columnar projections 18 is the highest at the center position, and gradually decreases as going outward. 8 was arranged on the color filter substrate 2. Each of the columnar projections 18 was also formed on the black matrix 16 which is a light shielding part, as shown in FIG. 9B.
  • the liquid crystal material supplied onto the color filter substrate 2 spreads over the entire cell centering on the dropping position and gradually decreasing the speed.
  • the columnar projections 18 serve as obstacles in the path of the liquid crystal material that diffuses radially.
  • the direction of movement of the liquid crystal material can be changed around the columnar projection 18. That is, while the liquid crystal material diffuses on the color filter substrate 2, ionizable impurities contained in the liquid crystal material diffuse in the liquid crystal material. Display defects are suppressed.
  • a display panel was produced by a dropping method as described below.
  • columnar projections 18 as described above were formed using the same photocurable resin as in Example 3, and an alignment film (not shown) was provided on the surface thereof.
  • the seal material 3 is applied to the peripheral portion of the color filter substrate 2 by screen printing.
  • the liquid crystal material is directed toward the center of the triple circle on the left side in FIG. 9a. Drop each one.
  • the array substrate on which the electrodes and the like are formed by a predetermined method is separated by a distance of 10 mm. Then, the alignment of the two substrates is performed so as to face the color filter substrate 2. After that, depressurize the inside of the chan- no and bond the two substrates together.
  • the liquid crystal display panel obtained as described above was driven together with a conventional liquid crystal display panel having no columnar projection 18.
  • the liquid crystal display panel of the present embodiment provided good display. I was able to get it.
  • the ionic impurities in the liquid crystal layer are removed by using the electric action.
  • the electric action is an example of how to remove it effectively.
  • the liquid crystal display panel of this embodiment is shown in FIGS. 10a and 10b.
  • the column-shaped projections 18 provided on the color filter substrate 2 correspond to the facing electrodes. It is electrically connected to 15.
  • the columnar projections 18 are provided in the light shielding portion.
  • the above liquid crystal display panel is manufactured by the following method.
  • a counter electrode 15 made of a transparent conductive material such as ITO is formed on the glass plate 9.
  • the counter electrode 15 using a paste obtained by dispersing force-bon powder in a photocurable resin (manufactured by JSR: Optoma NN700), the counter electrode 15 Then, a film having a thickness of about 4 ⁇ m is formed by the spin coating method. After the pre-baking, only a portion of the obtained film where a columnar projection is to be formed is exposed, and the photocurable resin in that portion is cured. After the postbaking, the cured resin is left on the glass plate 9 by etching the film. Further, heat treatment is performed in an open state to form columnar projections 18. Here, the curing shrinkage of the columnar projections can be controlled by controlling the temperature of the heat treatment.
  • Drying at a high temperature increases the surface area of the projection due to the occurrence of cracks due to the difference in shrinkage between the surface and the interior of the projection. The effect can be enhanced.
  • the diameter of the formed columnar projections 18 was set to 20 m or less, which was smaller than the width (25 ⁇ m) of the black matrix 16.
  • a color filter 19 and a black matrix 16 are formed on the counter electrode 15 to obtain a color filter substrate 2. .
  • a panel is prepared by a predetermined method.
  • the array side of the columnar projection 18 was made thinner than that of the force filter on the evening side. . Since the columnar projections 18 are conductive, if the alignment accuracy between the array substrate 1 and the color filter substrate 2 is poor, the electrodes between adjacent pixels are short-circuited. May be lost. Therefore, by reducing the portion of the columnar projection 18 that comes into contact with the array side, the rigorous joining accuracy between the array substrate 1 and the color filter substrate 2 is reduced. This can prevent a shot from occurring in adjacent pixels.
  • the obtained non-cells were placed in a 70 ° C. constant temperature bath, driven for 120 hours, and evaluated by displaying the halftone. As a result, with the liquid crystal display panel of this example, no display blur was observed, and good display could be performed.
  • FIGS. 11a and 11b show the liquid crystal display cells of this example.
  • This panel is a so-called IPS type, in which a pixel electrode 14 and a counter electrode 15 are both provided on an array substrate 1.
  • a storage capacitor section 20 is provided so as to face the gate line 11. Yes.
  • the storage capacitor section 20 is electrically connected to the pixel electrode 14.
  • an opening 20a is formed by removing a portion of the transparent insulating layer 21 formed on the upper surface of the storage capacitor portion 20.
  • the opening 20 a and the columnar projection 1 are provided. 8 and are electrically connected. Since a negative potential is applied to the gate line 11 here, a relatively positive potential is applied to the pixel electrode 14. Accordingly, the columnar projection 18 electrically connected to the pixel electrode 14 acts as a positive electrode, and can accumulate anions.
  • the obtained liquid crystal display panel was placed in a thermostat at 70 ° C., driven for 120 hours, and evaluated by displaying the halftone. As a result, in the panel of this example, good display could be observed without display blur.
  • columnar projections may be formed on the orientation film after the orientation film is formed.
  • an opening is provided on the upper surface of the storage capacitor unit in the same manner as in the seventh embodiment.
  • a paste made of a photocurable resin in which nickel-supported aluminum oxide was dispersed was used for the array substrate 1 as in Example 4.
  • Columnar projections 18 were formed at the locations on the color filter substrate 2 corresponding to the provided openings 20a.
  • a liquid crystal display panel was manufactured using the color filter substrate 2 having the columnar projections 18 formed on the surface thereof.
  • ion-impurities electrically attracted to the opening 20 a provided on the array 1 substrate are formed on the columnar projections 18. It is trapped.
  • the obtained liquid crystal display panel was placed in a constant temperature bath at 70 ° C., driven for 120 hours, and evaluated by displaying a halftone. As a result, in the panel of the present embodiment, good display was obtained without display blur.
  • the columnar projection does not necessarily need to be provided so as to abut the opening, and is provided near the opening so as to be attracted to the opening. The same effect can be obtained by trapping the ionic impurities.
  • an array substrate having an opening on the upper surface of the storage capacitor is used as in the seventh embodiment.
  • a paste was prepared by dispersing a powder containing an anion-exchange resin having ion adsorption properties in the same photocurable resin as described above. By using the obtained base, half of the above-mentioned examples were applied to half of the locations on the color filter substrate corresponding to the openings provided in the array substrate. And similar technique with high A columnar projection of 4 m was formed.
  • a paste was prepared by dispersing a powder containing a cation exchange resin in the same photocurable resin.
  • the obtained paste is used to form a columnar projection on the color filter substrate, corresponding to the opening provided on the array substrate, and forming the columnar projection first.
  • a column-shaped projection with a height of 4 m was formed in the uncut portion.
  • the substrates on which the columnar protrusions were formed as described above were sequentially provided with sulfuric acid, pure water, alcohol, alcohol, pure water, and alcohol.
  • a deionization treatment was performed to clean the substrate.
  • a liquid crystal display panel was fabricated using the color filter substrate obtained in this manner.
  • the obtained cell was placed in a constant temperature bath at 70 ° C., driven for 120 hours, and evaluated by displaying the halftone.
  • a good display could be obtained. This is considered to be because ion impurities accumulated on the negative electrode could be trapped at the columnar protrusions.
  • the columnar projection does not necessarily need to be provided so as to abut the opening, and the same effect can be obtained by providing the columnar projection near the opening. .
  • a method of charging the protrusion and electrically adsorbing the ionic impurity to the protrusion, or a method of removing the ionic impurity as in the above-described embodiment is carried out under severe conditions. In this case, a greater effect can be obtained.
  • the conditions for applying a voltage to the projections and the charged parts are limited by the conditions for using the liquid crystal display panel. Therefore, the above-mentioned ionic impurities are removed under severe conditions in advance in the production stage of the product.
  • a high voltage of ⁇ 30 V and a high voltage of ⁇ 30 V are applied to the entire screen as the ion adsorption drive at a frequency of 60 Hz. Apply to the suction part. It is desirable that this ion adsorption drive be performed at the same time as the lighting inspection that is performed before the IC is mounted.
  • ion suction drive as in the above-described embodiment is also useful to be performed at the time of starting up the device.
  • a voltage of +20 V and --10 V is applied to the gate electrode at 60 Hz for a certain time. Do not light the nozzle during the ion adsorption drive. After that, display is performed by normal driving.
  • This drive absorbs the ion every time the equipment is started up, so that a good display without any defects can be obtained for a long period of time. .
  • INDUSTRIAL APPLICABILITY According to the present invention, it is possible to suppress a display defect of a liquid crystal display cell caused by so-called injection mura.
  • the present invention can be used to eliminate other causes of display defects caused by ionizable impurities mixed in the liquid crystal. It is very useful for providing a liquid crystal display panel with excellent display characteristics.

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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)

Abstract

L'invention concerne un panneau d'affichage à cristaux liquides dans lequel on a éliminé le défaut d'affichage causé par une injection irrégulière. L'injection irrégulière est supprimée par régulation du flux d'une matière à cristaux liquides fournie par une couche de cristaux liquides, au moyen d'une protubérance ménagée en guise d'obstacle. Le panneau d'affichage à cristaux liquides comprend un premier substrat pourvu d'un filtre coloré, un second substrat présentant une surface placée face à la surface du premier substrat et disposée à un intervalle spécifique, une couche de cristaux liquides ménagée entre le premier substrat et le second substrat, et une pluralité d'électrodes permettant d'appliquer une tension à la couche de cristaux liquides. Au moins l'un des deux substrats est pourvu, sur la surface placée face au substrat opposé, d'une protubérance qui est destinée à réguler le flux d'une matière à cristaux liquides fournie par la couche de cristaux liquides.
PCT/JP2000/006970 1999-10-05 2000-10-05 Panneau d'affichage a cristaux liquides, procedes de fabrication et d'utilisation associes WO2001025844A1 (fr)

Priority Applications (1)

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KR1020017006824A KR20010090855A (ko) 1999-10-05 2000-10-05 액정표시패널 및 그 제조방법 및 구동방법

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JP28436599 1999-10-05
JP28436499 1999-10-05
JP11/284366 1999-10-05
JP11/284364 1999-10-05
JP11/284365 1999-10-05
JP28436699 1999-10-05

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KR100652050B1 (ko) * 2002-03-20 2006-11-30 엘지.필립스 엘시디 주식회사 액정표시소자 및 그 제조방법
KR100859470B1 (ko) * 2002-06-08 2008-09-23 엘지디스플레이 주식회사 액정표시소자 및 그 제조방법
KR100920347B1 (ko) * 2002-12-04 2009-10-07 삼성전자주식회사 액정 표시 장치의 제조 방법
KR100919899B1 (ko) * 2002-12-31 2009-10-06 하이디스 테크놀로지 주식회사 액정표시장치의 주입구 구조
KR102260871B1 (ko) * 2015-01-19 2021-06-04 삼성디스플레이 주식회사 액정 표시 장치 및 그 제조 방법

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01200334A (ja) * 1988-02-05 1989-08-11 Seiko Epson Corp 液晶表示装置
JPH03274025A (ja) * 1990-03-23 1991-12-05 Seiko Epson Corp 液晶表示パネル
JPH05127180A (ja) * 1991-11-08 1993-05-25 Ricoh Co Ltd 液晶表示素子
JPH05232482A (ja) * 1992-02-21 1993-09-10 Canon Inc 液晶表示装置
EP0740184A2 (fr) * 1995-04-28 1996-10-30 Canon Kabushiki Kaisha Dispositif à cristal liquide, procédé pour sa fabrication, et appareil à cristal liquide
JPH10177177A (ja) * 1996-12-17 1998-06-30 Advanced Display:Kk 液晶表示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01200334A (ja) * 1988-02-05 1989-08-11 Seiko Epson Corp 液晶表示装置
JPH03274025A (ja) * 1990-03-23 1991-12-05 Seiko Epson Corp 液晶表示パネル
JPH05127180A (ja) * 1991-11-08 1993-05-25 Ricoh Co Ltd 液晶表示素子
JPH05232482A (ja) * 1992-02-21 1993-09-10 Canon Inc 液晶表示装置
EP0740184A2 (fr) * 1995-04-28 1996-10-30 Canon Kabushiki Kaisha Dispositif à cristal liquide, procédé pour sa fabrication, et appareil à cristal liquide
JPH10177177A (ja) * 1996-12-17 1998-06-30 Advanced Display:Kk 液晶表示装置

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TW578027B (en) 2004-03-01

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