JP2004184701A - Liquid crystal display panel and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display panel with excellent display characteristics. <P>SOLUTION: The liquid crystal display panel is provided with a first substrate such as a TFT array substrate and a second substrate such as a color filter substrate and is constructed together with a sealing material which is present on peripheral parts of the first and second substrates and surrounds a region where a liquid crystal layer is present on the outside of a display region, and fixes both the substrates. Additionally in the liquid crystal display panel, a black matrix region on the second substrate on the non-terminal side, vertical to a running into direction of the substrate in rubbing and with no alignment layer formed thereon is formed so as to be longer than the travelling distance of the substrate while a rubbing roll makes one rotation. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid crystal display panel and a method for manufacturing the same. More specifically, the present invention relates to a liquid crystal display panel having good display characteristics and a method for manufacturing the same.
[0002]
[Prior art]
A conventional liquid crystal display device includes a lower transparent insulating substrate (array substrate) on which thin film transistors and an alignment film are stacked and an upper transparent insulating substrate (color filter substrate) on which color filters and an alignment film are stacked. After being superimposed at predetermined intervals using the scattered spacers and bonded by a sealing material provided on the peripheral edge, liquid crystal is injected from a liquid crystal injection port formed in a part of the sealing material, and then sealed. , A polarizing plate attached to the outside of both substrates of the liquid crystal display panel, a backlight disposed on one of the substrates, and the like.
[0003]
An example of a liquid crystal display panel in a conventional liquid crystal display device is shown in FIGS. As shown in FIG. 3, in the liquid crystal display panel, a black matrix 24 for light shielding is formed on an outer peripheral portion of the effective display area 26. The dimension from the edge of the black matrix 24 to the edge of the display area 26 is shorter than the dimension from the edge of the panel outer shape 22 to the edge of the display area 26 (for example, see Patent Document 1). In FIG. 3, 21 is a color filter substrate, 23 is a color filter, 25 is an alignment film, and 31 is a rubbing roller.
[0004]
[Patent Document 1]
JP-A-8-234190
[Problems to be solved by the invention]
Conventionally, as shown in FIGS. 3 and 4, when the alignment film 25 applied to the color filter substrate 21 in the liquid crystal display panel is rubbed, the display region 26 forms the alignment film 25 around the alignment film 25. The pattern of the black matrix 27 that has not been dragged may be visually recognized as unevenness 41 perpendicular to the direction S in which the pattern enters the rubbing roller 31 (rotation direction R) of the color filter substrate 21. In particular, there is a problem that the display is visually recognized as a display defect near the rubbing entry direction.
[0006]
The present invention has been made in view of the above circumstances, and has as its object to provide a liquid crystal display panel having good display characteristics and a method of manufacturing the same.
[0007]
[Means for Solving the Problems]
The liquid crystal display panel of the present invention includes a transparent insulating substrate, a plurality of scanning lines formed of a metal layer provided on the transparent insulating substrate, and a plurality of signal lines arranged in a matrix via the scanning lines and the insulating layer. A first substrate comprising a plurality of pixel electrodes provided for forming a display region corresponding to each intersection of the plurality of scanning lines and the plurality of signal lines, and a coated alignment film; A transparent insulating substrate, a black matrix which is a light-shielding layer formed on the surface on the first substrate side, a colored layer, a transparent electrode, and a coated orientation, which are superimposed on the substrate while being held by a spacer via a liquid crystal layer. A liquid crystal display panel comprising: a second substrate made of a film; and a sealing material that surrounds a region where the liquid crystal layer is present outside the display region around the periphery of the first substrate and the second substrate and fixes the two substrates. And the laser on the second substrate A black matrix region where the alignment film is not formed in the substrate entry direction perpendicular anti terminal side of the ring, characterized in that the rubbing roller made is formed longer than the distance traveled in between one revolution.
[0008]
Further, in the method of manufacturing a liquid crystal display element of the present invention, a transparent insulating substrate, a plurality of scanning lines made of a metal layer provided on the transparent insulating substrate, and arranged in a matrix with the scanning lines and an insulating layer interposed therebetween. A first substrate including a plurality of signal lines, a plurality of pixel electrodes provided for forming a display region corresponding to each intersection of the plurality of scanning lines and the plurality of signal lines, and a coated alignment film; A transparent insulating substrate, a black matrix as a light-shielding layer formed on the surface on the first substrate side, a colored layer, a transparent electrode, A second substrate comprising an applied alignment film; and a sealant surrounding the first substrate and the second substrate at a peripheral portion of the liquid crystal layer outside the display region and fixing the two substrates. A method for manufacturing a liquid crystal display element, Substrate entry direction perpendicular anti terminal side rubbing roller a region of the black matrix alignment layer is not formed in the rubbing on the second substrate is characterized by longer than the distance proceeding during one revolution.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
In the liquid crystal display device according to the present invention, a driving circuit is connected to a liquid crystal display panel having a liquid crystal layer sandwiched by holding a spacer between a first substrate as a TFT array substrate and a second substrate as a color filter substrate. The liquid crystal display panel is configured to overlap a backlight (illumination device) arranged on one substrate side. Generally, the driving circuit includes a tape-shaped film carrier (TCP: Tape Carrier Package) on which an LSI for driving a TFT is mounted, and a printed circuit board (PCB: Printed Circuit) for transmitting power and image signals to the film carrier. Circuit Board).
[0010]
The first substrate includes a transparent insulating substrate, a plurality of scanning lines formed of a metal layer provided on the transparent insulating substrate, and a plurality of signal lines arranged in a matrix via the scanning lines and the insulating layer. And a plurality of pixel electrodes provided corresponding to the intersections of the plurality of scanning lines and the plurality of signal lines, and an alignment film applied to the surface. The second substrate includes a transparent insulating substrate, a black matrix which is a light shielding layer formed on the transparent insulating substrate, a coloring layer, a transparent electrode, and an alignment film. A seal material surrounding the area where the liquid crystal layer exists outside the display area is disposed between the first substrate and the peripheral edge of the second substrate, and the two are fixed.
[0011]
In the present invention, the black matrix region having no alignment film on the side opposite to the terminal perpendicular to the direction in which the rubbing enters the substrate on the second substrate is longer than the distance traveled during one rotation of the rubbing roller.
[0012]
Hereinafter, a liquid crystal display panel of the present invention and a method for manufacturing the same will be described with reference to the accompanying drawings.
[0013]
Embodiment 1
FIG. 1 is a plan view illustrating Embodiment 1 of a liquid crystal display panel of the present invention.
[0014]
The liquid crystal display panel according to the first embodiment has a structure in which a liquid crystal layer is held between a first substrate, which is a TFT array substrate, and a second substrate, which is a color filter substrate, by holding with a spacer. Hereinafter, the main part of the present invention will be described in detail with reference to the color filter substrate 10 shown in FIG.
[0015]
In FIG. 1, reference numeral 1 denotes an upper transparent insulating substrate such as a glass substrate, 2 denotes a panel outer shape (that is, an outer shape of a liquid crystal panel), 3 denotes a color filter formed on the upper transparent insulating substrate 1, and 4 denotes an upper transparent insulating substrate. A black matrix which is a light-shielding layer formed on the substrate 1, 5 is an alignment film, 6 is a display region of a liquid crystal display panel, 7 is a black matrix region where no alignment film is formed, and 11 is a rubbing roller.
[0016]
The color filter substrate 10 includes a color filter 3 formed on the transparent insulating substrate 1, a black matrix 4 made of multi-layer chromium and the like, colored layers of three colors RED, GREEN, BLUE, ITO (Indium Tin Oxide), and the like. And the alignment film 5 and the like. For example, the black matrix 4 is patterned by exposing and developing after forming a multilayer chromium film by sputtering or the like. The coloring layer is formed by a pigment dispersion method, a dyeing method, an electrodeposition method, or the like. The transparent electrode is formed of a transparent electrode material such as ITO by using a mask sputtering method or the like.
[0017]
The array substrate includes a pixel electrode, a transistor, a scanning line, a signal line, an alignment film, and the like formed on a transparent insulating substrate such as a glass substrate. This array substrate can be manufactured by stacking (patterning) while repeating steps such as film formation, resist coating, exposure, development, etching and resist peeling.
[0018]
Further, the alignment film 5 applied to the color filter substrate 10 and the array substrate is rubbed in a predetermined direction.
[0019]
In the liquid crystal display panel, a spacer in a seal made of, for example, glass fiber or the like is mixed into a sealing material made of a thermosetting epoxy resin, and applied to the periphery of the color filter substrate 10 or the array substrate by screen printing or using a dispenser. I do. Next, the upper and lower substrates are held by an in-plane spacer or the like, and are superposed at a predetermined interval, and a curing process is performed. Then, after the substrate is cut in the same way as the empty cell, liquid crystal is injected from the injection port, and then the injection port is sealed.
[0020]
In the color filter substrate 10 according to the first embodiment, as shown in FIG. 1, the black matrix region 7 without the alignment film 5 on the non-terminal side T perpendicular to the substrate entry direction S of the rubbing on the color filter 3. The width is longer than the distance that the color filter substrate 10 travels while the rubbing roller 11 makes one rotation in the direction of arrow R. That is, in the first embodiment, rubbing is started from the opposite terminal side T.
[0021]
For example, when the rubbing roller 11 rotates at A (rpm) during rubbing, the time required for one rotation is 60 / A (sec). Assuming that the stage speed during rubbing is B (mm / sec), the distance traveled by the stage, that is, the transparent insulating substrate 10 during one rotation of rubbing is B × 60 / A (mm). When the distance from the edge of the display area 6 to the edge of the alignment film 5 is C (mm) and the distance from the edge of the display area 6 to the edge of the black matrix 4 is D (mm), an alignment film is formed. The area 7 of the non-existing black matrix 4 becomes DC (mm). The width DC (mm) of the black matrix 4 on the anti-terminal side T where the alignment film 5 is not formed is B × 60 / A (mm) or more, and the width of the black matrix 4 where the alignment film 5 is not formed is set. Is made longer than the distance that the transparent insulating substrate 10 travels while the rubbing roller 11 makes one rotation.
[0022]
Thereby, the region of the black matrix where the alignment film is not formed can be rubbed over the entire surface of the rubbing cloth, so that the damage of the rubbing cloth can be made uniform over the entire circumference. Thereby, it is possible to suppress the occurrence of display unevenness caused by drawing in the pattern of the black matrix.
[0023]
In recent years, there has been a demand for a reduction in the size of the panel frame, and there is a possibility that the dimension from the edge of the black matrix to the edge of the display area is longer than the dimension from the panel edge on the opposite terminal side to the edge of the display area . However, since there is no terminal on the side opposite to the terminal, even if the black matrix is enlarged and cut on a line of the black matrix, no short circuit or the like occurs. Therefore, the dimension from the edge of the black matrix to the edge of the display area can be made longer than the dimension of the edge of the display area from the outer shape of the panel on the opposite terminal side. On the terminal side, rubbing is performed outside the display area after rubbing the black matrix portion. During this time, since the rubbing cloth is used, the display unevenness in the direction perpendicular to the direction in which the color filter substrate enters the rubbing roller does not occur.
[0024]
Next, the present invention will be described based on examples, but the present invention is not limited to only these examples.
[0025]
Example First, the roller rotation speed A of the rubbing roller is set to 1000 rpm, and the stage speed B is set to 100 mm / sec. The dimension from the end of the display area on the side opposite to the terminal to the outer shape of the panel is 9 mm. At this time, the distance traveled by the stage during one rotation of the rubbing is 6 mm. The distance C from the edge of the display area to the edge of the alignment film is 1 mm. The distance D from the edge of the display area to the edge of the black matrix is 8 mm. The area (D-C) of the black matrix where the alignment film is not formed is 7 mm.
[0026]
Next, rubbing is performed from the opposite terminal side. As a result, the area of the black matrix where the alignment film is not formed is longer than the distance that the stage travels during one rotation of the rubbing. Therefore, the entire area of the black matrix where the alignment film is not formed over the entire circumference of the rubbing cloth. Was rubbed, so that the damage of the rubbing cloth became uniform and no display unevenness occurred.
[0027]
Embodiment 2
Next, a second embodiment of the present invention will be described. To reduce the size of the liquid crystal display device, it is necessary to narrow the frame. Therefore, in the second embodiment of the present invention, as shown in FIG. 2, only the dimension from the end of the display area 6 on the opposite terminal side T to the panel outer shape 2 is 4 mm from the conditions of the example in the first embodiment. Change to The cutting line of the panel outer shape 2 on the opposite terminal side T enters the region of the black matrix 4. In the case of the non-terminal side T, there is no possibility of short-circuiting even when cutting is performed at the region of the black matrix 4, so that a narrow frame panel can be achieved.
[0028]
【The invention's effect】
As described above, according to the present invention, it is possible to eliminate display unevenness in the alignment film process by making the region of the black matrix where the alignment film is not formed longer than the distance the stage advances during one rotation of rubbing. it can. Thus, a liquid crystal display panel and a liquid crystal display device having good display characteristics can be obtained.
[Brief description of the drawings]
FIG. 1 is a plan view illustrating Embodiment 1 of a liquid crystal display panel according to the present invention.
FIG. 2 is a plan view illustrating a liquid crystal display panel according to a second embodiment of the present invention.
FIG. 3 is a plan view showing an example of a conventional color filter substrate.
FIG. 4 is a diagram showing display unevenness in a conventional color filter substrate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transparent insulating substrate 2 Panel outline 3 Color filter 4 Black matrix 5 Alignment film 6 Display area 7 Black matrix area where no alignment film is formed 10 Color filter substrate 11 Rubbing roller

Claims (4)

A transparent insulating substrate, a plurality of scanning lines formed of a metal layer provided on the transparent insulating substrate, a plurality of signal lines arranged in a matrix via the scanning lines and the insulating layer, the plurality of scanning lines and a plurality of A plurality of pixel electrodes provided to form a display region corresponding to each intersection of the signal lines of the first and second lines, and a first substrate made of a coated alignment film;
A transparent insulating substrate, a black matrix as a light-shielding layer formed on the surface on the first substrate side, a colored layer, a transparent electrode, and a coating, which are superposed on the first substrate while being held by a spacer via a liquid crystal layer. A second substrate made of an oriented film,
A liquid crystal display panel comprising a sealing material that surrounds a region where the liquid crystal layer is present outside the display region at a peripheral portion of the first substrate and the second substrate, and fixes both substrates.
A liquid crystal display panel in which a region of the black matrix on the second substrate, on the side opposite to the terminal perpendicular to the direction in which the rubbing enters the substrate, on which the alignment film is not formed, is formed longer than the distance traveled during one rotation of the rubbing roller. . A transparent insulating substrate, a plurality of scanning lines formed of a metal layer provided on the transparent insulating substrate, a plurality of signal lines arranged in a matrix via the scanning lines and the insulating layer, the plurality of scanning lines and a plurality of A plurality of pixel electrodes provided to form a display region corresponding to each intersection of the signal lines of the first and second lines, and a first substrate made of a coated alignment film;
A transparent insulating substrate, a black matrix as a light-shielding layer formed on the surface on the first substrate side, a colored layer, a transparent electrode, and a coating, which are superposed on the first substrate while being held by a spacer via a liquid crystal layer. A second substrate made of an oriented film,
A method of manufacturing a liquid crystal display element, comprising: a periphery of the first substrate and a second substrate, surrounding a region where the liquid crystal layer exists outside the display region, and a sealing material for fixing the two substrates;
A method of manufacturing a liquid crystal display panel, wherein a region of a black matrix in which an orientation film is not formed on a side opposite to a terminal of a rubbing substrate perpendicular to a direction in which the rubbing enters the second substrate is longer than a distance traveled during one rotation of a rubbing roller. . 3. The second substrate is cut at a region of the black matrix on the side opposite to the terminal perpendicular to the direction of entry of the rubbing into the substrate, and an end of the liquid crystal display panel on the side of the terminal opposite to the region of the black matrix. Liquid crystal display panel manufacturing method. 4. The method for manufacturing a liquid crystal display panel according to claim 2, wherein the rubbing direction of the second substrate is set from a side opposite to the terminal.

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