JP2005250236A - Liquid crystal display, manufacturing method of liquid crystal display, and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display wherein straight-line-shaped rubbing unevenness caused by rapid disorder of a rubbing cloth is hardly caused on a substrate when an alignment layer on the substrate is subjected to rubbing treatment. <P>SOLUTION: In the liquid crystal display wherein a liquid crystal is interposed between a pair of rectangular substrates, a chamfered part is formed at at least one of four corner parts 3c of at least one substrate 3 of the pair of substrates, the surface of the chamfered part is formed so as to be orthogonal to the direction of the rubbing treatment performed to the alignment layer formed on the substrate and the chamfered part has a curved shape. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device, a method for manufacturing a liquid crystal display device, and an electronic apparatus, and more particularly to a shape of a substrate used in the liquid crystal display device and a rubbing method for the substrate.

  As is well known, a liquid crystal display device is configured by enclosing a liquid crystal between two substrates made of a glass substrate, a quartz substrate, etc., and a thin film transistor (hereinafter referred to as TFT) is provided on one substrate, for example. Switching elements such as) are arranged in a matrix, the counter electrode is arranged on the other substrate, and the optical characteristics of the liquid crystal layer sealed between the two substrates are changed according to the image signal, thereby displaying an image. It is possible.

  At this time, the TFT substrate on which the TFT is disposed and the counter substrate disposed opposite to the TFT substrate are manufactured separately, and these two substrates are bonded together with high accuracy in the panel assembling process, and then the liquid crystal is It comes to be enclosed.

  In this panel assembling process, first, an alignment film for aligning liquid crystal molecules along the substrate surface is formed on the surfaces of the TFT substrate and the counter substrate, which are manufactured in the manufacturing process of each substrate, in contact with the liquid crystal layer. . This alignment film is formed, for example, by printing polyimide with a thickness of about several tens of nanometers.

  Thereafter, baking is performed, and a rubbing process is performed to determine the alignment of liquid crystal molecules when no voltage is applied. Next, a seal part as an adhesive is provided on the peripheral edge of one substrate, and the TFT substrate and the counter substrate are bonded together using this seal part, and are cured by pressure bonding while performing alignment, and then provided on a part of the seal part. A technique of enclosing liquid crystal through a notch is used.

  Here, the rubbing process refers to a rubbing roller having a surface formed of cloth or other cloth material, and the alignment film formed on the substrate surface is brought into contact with the rubbing roller and moved linearly to form fine grooves on the surface of the substrate alignment film. The alignment film is formed into an alignment anisotropic film. The alignment of the liquid crystal molecules can be defined by performing a rubbing process for forming grooves in a certain direction on the alignment film.

  In this rubbing treatment, an alignment film is formed on a substrate made of a large plate of, for example, 8 inches or more manufactured in each manufacturing process of the substrate, and the alignment film is rubbed, as shown in FIG. There is a method in which an alignment film is formed on a substrate made of a large plate of 8 inches or more in a predetermined size, and the cut substrate 120 is placed on a pallet 110 to be rubbed.

  By the way, in this rubbing treatment, as shown in FIG. 13, a rectangular substrate 120 is parallel to the relative traveling direction of the substrate 120 and the rubbing roller 100, and the substrate 120 is rubbed with a rubbing cloth 100. Generally, a method of abutting on the peripheral surface 100a is performed.

  Further, as shown in FIGS. 14 and 16, a method of bringing one side of the substrate 120 into contact with the rubbing roller 100 with a specific angle θ (for example, 2 ° or 3 °) is also generally performed. Yes. In this way, by performing the rubbing process on the substrate with a certain angle, the clear viewing angle of the liquid crystal display device constituted by the substrate after the rubbing process can be set in an optimum direction.

  However, in this case, due to the right-angled shape at the corners of the peripheral edge of the alignment film formed on the substrate with which the rubbing roller first comes into contact, the surface of the rubbing roller is locally fuzzed, fuzzed, etc. There may be a sudden disturbance in the hair flow of the cloth. As a result, linear rubbing unevenness may occur in the alignment film on the display region of the substrate.

  When the liquid crystal display device configured using the substrate having the rubbing unevenness in the alignment film is used for a projector such as a projector, the influence of the rubbing unevenness is exerted on the projected screen 200 as shown in FIG. Therefore, there is a problem that the alignment of the liquid crystal is disturbed and one streak 200 is projected.

In view of such problems, there has been proposed a technique for chamfering the corners of the peripheral edge portion of the alignment film formed on the substrate that first contacts the rubbing roller (see, for example, Patent Document 1).
JP 10-333150 A

  However, even if the corners of the alignment film are chamfered, as shown in FIGS. 14 and 16, the corner 120a of the peripheral edge of the substrate 120 that first contacts the rubbing roller 100 has a right-angled shape. When contacting the substrate 120, there is a problem that the cross hair flow of the peripheral surface 100a of the rubbing roller 100 is locally disturbed by the corner 120a. Specifically, there is a problem in that a rapid rubbing such as fluffing and cracking occurs in the cloth, and as a result, linear rubbing unevenness 115 occurs in the display area of the substrate 120.

  The present invention has been made paying attention to the above-mentioned problem, and its purpose is to provide a liquid crystal display in which linear rubbing unevenness due to a sudden cross disorder is hardly generated on the substrate when the alignment film on the substrate is rubbed. An apparatus, a manufacturing method of a liquid crystal display device for manufacturing the liquid crystal display device with a high yield, and an electronic device using the liquid crystal display device are provided.

  In order to achieve the above object, a liquid crystal display device according to the present invention is a liquid crystal display device in which liquid crystal is sandwiched between a pair of rectangular substrates, and corners of four corners of at least one of the pair of substrates. A chamfered portion is formed in at least one of the portions.

  According to the liquid crystal display device of the present invention, during the rubbing process, a sudden disturbance such as fluffing or fuzzing of the cloth on the peripheral surface of the rubbing roller due to the shape of the corner of the substrate with which the rubbing roller first contacts is prevented. In addition, there is an effect that it is possible to prevent occurrence of linear rubbing unevenness due to cross disturbance in the alignment film on the display region of the substrate.

  The surface of the chamfered portion is formed so as to be orthogonal to the direction of rubbing treatment performed on the alignment film formed on the substrate.

  According to the liquid crystal display device of the present invention, since the chamfered portion of the substrate is formed in a direction orthogonal to the rubbing direction of the substrate, the periphery of the substrate with which the rubbing roller first contacts during the rubbing process This can prevent sudden disturbance such as fluffing and fuzzing on the circumferential surface of the rubbing roller due to the shape of the corners of the part, and the cross disturbance on the alignment film on the display area of the substrate is linear rubbing unevenness. It has the effect that it can prevent generating.

  Further, the chamfered portion is formed to have a curved shape. The surface of the chamfered portion is formed to have a polygonal shape. Furthermore, the chamfered portion has a surface inclined in the plate thickness direction.

  According to the liquid crystal display device of the present invention, the chamfered portion of the substrate has a curved shape, a polygonal shape, and a surface inclined in the plate thickness direction. Thus, during the rubbing process, it is possible to further prevent sudden disturbance such as fluffing and fuzzing of the cloth on the peripheral surface of the rubbing roller due to the shape of the corner of the peripheral edge of the substrate with which the rubbing roller first contacts. In addition, there is an effect that it is possible to prevent occurrence of linear rubbing unevenness due to cross disturbance in the alignment film on the display region of the substrate.

  The method for manufacturing a liquid crystal display device according to the present invention is a method for manufacturing a liquid crystal display device in which liquid crystal is sandwiched between a pair of rectangular substrates, and corners at four corners of at least one of the pair of substrates. A step of chamfering at least one of the substrate, a step of forming an alignment film on the substrate chamfered at the corner, and a step of rubbing the alignment film, and the step of rubbing the substrate. The substrate is fixed so that one side of the rubbing roller is inclined at a specific angle with respect to the traveling direction of the rubbing roller with respect to the substrate, and the rubbing roller first contacts the chamfered portion of the substrate.

  According to the method for manufacturing a liquid crystal display device of the present invention, a substrate having a chamfered portion formed at least at a corner portion of the substrate that first contacts the rubbing roller among the four corner portions of the substrate used in the liquid crystal display device. Since the rubbing process is performed, it is possible to prevent sudden disturbance such as fluffing and fuzzing on the circumferential surface of the rubbing roller due to the shape of the corner of the substrate with which the rubbing roller first comes into contact. Since the rubbing process can be performed while preventing the occurrence of linear rubbing unevenness in the alignment film, the liquid crystal display device can be manufactured with a high yield.

  Further, the rubbing process is performed by placing a plurality of the rectangular substrates on a pallet.

  According to the method for manufacturing a liquid crystal display device of the present invention, the yield can be increased and the substrate can be rubbed.

  In the rubbing process, the rubbing roller travel direction relative to the substrate is different from the rubbing direction.

  According to the method for manufacturing a liquid crystal display device of the present invention, even if the substrate is rubbed by bias rubbing, the rubbing is caused by the shape of the corner of the peripheral edge of the substrate that the rubbing roller first contacts during the rubbing treatment. Abrupt disturbances such as fluffing and fuzzing of the cloth on the roller peripheral surface can be prevented, and further, it is possible to prevent occurrence of linear rubbing unevenness in the alignment film on the display area of the substrate. It has the effect of being able to.

  An electronic apparatus according to the present invention uses the liquid crystal display device according to claims 1 to 6.

  According to the electronic device of the present invention, the chamfered portion is formed at least at the corner of the substrate that first contacts the rubbing roller among the four corners of the substrate of the liquid crystal display device used in the electronic device. When assembling a liquid crystal display device used for electronic equipment, there is an effect that the assembly direction of the substrate is not mistaken.

  Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the liquid crystal display device includes a substrate on which an active element (active element) such as a TFT (thin film transistor) is formed (hereinafter referred to as a TFT substrate) and a substrate (see FIG. Hereinafter, an active matrix liquid crystal display device using a counter substrate) will be described as an example.

  First, the configuration of the liquid crystal display device will be described with reference to FIG. FIG. 1 is a cross-sectional view of a liquid crystal display device showing an embodiment of the present invention.

  As shown in the figure, the liquid crystal display device 70 is configured by enclosing a liquid crystal 50 between a TFT substrate 9 and a counter substrate 3 provided facing the TFT substrate 9. On the surface of the TFT substrate 9 in contact with the liquid crystal 50, an alignment film 9h for aligning liquid crystal molecules along the TFT substrate surface is formed. In addition, an alignment film 3h for aligning liquid crystal molecules along the surface of the counter substrate is formed on the surface of the counter substrate 20 in contact with the liquid crystal 50.

  A sealing material 41 that encloses the liquid crystal 50 is formed between the TFT substrate 9 and the counter substrate 3. The sealing material 41 is disposed, for example, so as to substantially match the contour shape of the counter substrate 3, and fixes the TFT substrate 9 and the counter substrate 3 to each other.

  Next, the configuration of a rubbing apparatus for rubbing the alignment film formed on the substrate of the thus configured liquid crystal display device 70 will be described with reference to FIG. In the following description, the rubbing process is described by taking the counter substrate 3 as an example, and the counter substrate made of a large plate of, for example, 8 inches or more manufactured in the substrate manufacturing process is defined. An example will be described in which an alignment film is formed on what is cut into a size, and the cut counter substrate is placed on a pallet and a rubbing process is performed.

FIG. 2 is a schematic perspective view showing an example of a configuration of a main part of a rubbing apparatus for rubbing an alignment film formed on the counter substrate of the liquid crystal display device of FIG.
As shown in FIG. 2, the rubbing apparatus 1 includes a rubbing roller 2 fixed to an upper surface (hereinafter referred to as a reference plane) 4a of a base 4, and a plurality of rectangular counter substrates (hereinafter referred to as a rubbing process). (Hereinafter simply referred to as a substrate) 3 and a pallet 5 that moves on a reference plane 4a. Each alignment film 3h on the plurality of substrates 3 placed on the pallet 5 is a peripheral surface 2b of the rubbing roller 2. The guide 6 that guides the pallet 5 on the reference plane 4a and the motor 7 that supplies the rotational driving force to the rotating shaft 2c of the rubbing roller 2 constitute the main part.

  The rubbing roller 2 includes a roller portion 2a having a roller peripheral surface 2b formed of a cloth material such as cloth, a rotating shaft 2c, and a pair of bearings 2d. The main portion of the rubbing roller 2 is A pair of bearings 2d are rotatably supported on a plane parallel to the reference plane 4a. The pair of bearings 2d have a height adjusting mechanism (not shown) with respect to the reference plane 4a so that the height of the roller 2 can be arbitrarily adjusted.

  The rubbing roller 2 configured in this manner is supplied with a rotational force by the motor 7 via the rotating shaft 2c supported by the bearing 2d, so that the peripheral surface 2b of the roller portion 2a rotates in one direction. Each of the substrates 3 is in contact with the alignment film 3h formed on the surface, and a fine groove is formed on the surface of the alignment film 3h of each substrate 3 to make the alignment film 3h an alignment anisotropic film.

  In the rubbing process, the pallet 5 places a plurality of substrates 3 on the pallet 5 and moves by a guide 6 on the reference plane 4a, and rubs the plurality of substrates 3 placed on the pallet 5. Each of them is brought into contact with the roller 2.

  The guide 6 has a pallet angle adjusting mechanism 6a, and the pallet angle adjusting mechanism 6a is configured so that a plurality of substrates 3 placed on the pallet 5 guided by the guide 6 are rubbed with each substrate 3 and the rubbing roller 2 during the rubbing process. A predetermined angle is set so that one side of each substrate 3 is brought into contact with the rubbing roller 2 at a predetermined angle θ (for example, 2 ° or 3 °) with respect to the relative traveling direction of the pallet 5. It is fixed at a predetermined angle.

  In the rubbing process, the horizontal or vertical direction of each substrate 3 is brought into contact with the rubbing roller 2 with a predetermined angle θ by performing the rubbing process with a specific angle. This is because the clear viewing angle of the liquid crystal display device constituted by the substrate 3 after the rubbing process can be set in an optimum direction.

  Next, the shape of the substrate 3 to be rubbed using the rubbing apparatus 1 configured as described above will be described with reference to FIGS. 3 is a schematic plan view of a principal part showing that chamfered portions are formed at four corners of the substrate 3 used in the liquid crystal display device of FIG. 1, and FIG. 4 is a plan view of the substrate 3 used in the liquid crystal display device of FIG. It is a principal part part schematic plan view which shows having formed the chamfering part only in the corner | angular part of the board | substrate 3 which contact | abuts the rubbing roller 2 first among four corners.

  5 is a schematic plan view of a main part of the substrate 3 showing that the surface of the chamfered portion of the substrate 3 of FIG. 4 that first contacts the rubbing roller 2 is formed in a direction perpendicular to the rubbing direction of the substrate 3. FIG. 6 is a fragmentary schematic plan view of a main part showing that the chamfered portion of the substrate 3 of FIG. 3 or FIG. 4 has a polygonal shape.

  Further, FIG. 7 is a main part partial schematic perspective view showing that the chamfered portion of the substrate 3 of FIG. 3 or FIG. 4 is formed of a plurality of surfaces, and FIG. 8 is taken along the line VIII-VIII of FIG. FIG. 9 is a fragmentary schematic perspective view showing that the chamfered portion is curved, and FIG. 10 is a longitudinal sectional view taken along line XX of FIG.

  Details will be described below with reference to the drawings.

  As shown in FIG. 3, chamfered portions 3c having a curved shape, for example, are formed at four corners of each rectangular substrate 3 placed on the pallet 5 (see FIG. 2).

  When chamfered portions having curved shapes are formed in the corners 3c at the four corners of the substrate 3, the rubbing process is performed in parallel with the rubbing direction of the pallet 5 in the horizontal or vertical direction of the substrate 3. Is brought into contact with the rubbing roller 2 at a predetermined angle θ, the chamfered portion 3c does not have a right-angled shape, so that the chamfered portion 3c Does not cause disturbance in the cross hair flow such as cracks.

  Therefore, when the substrate 3 comes into contact with the rubbing roller 2 due to the shape of the corner portion 3c of the substrate 3, the corner portion 3c is caused to flow on the peripheral surface 2b of the rubbing roller 2 with cross hairs such as fluffing and cracking. Does not cause sudden disturbance. As a result, there is no problem that linear rubbing unevenness occurs in the alignment film on the display region of the substrate 3.

  Therefore, when the liquid crystal display device 70 configured using the substrate 3 after the rubbing process is used for a projector such as a projector, the influence of the rubbing unevenness is exerted on the projected screen 200 as shown in FIG. There is no possibility that one streak 200 is projected due to the disorder of the orientation of the liquid crystal.

  Note that the chamfered portions 3c formed at the four corners of the peripheral portion of the substrate 3 are not limited to a shape having a curve, and may be a shape having a polygon formed by an obtuse angle as shown in FIG. good. Since the shape having a polygon does not have a right-angle shape, the same effect as in the case where the chamfered portion 3c is a shape having a curve can be obtained.

  Further, the shape of the chamfered portion 3c is not limited to that described above, and when contacting the peripheral surface 2b of the rubbing roller 2, cross hairs such as fluffing and fuzzing on the peripheral surface 2b of the rubbing roller 2 are obtained. Any shape may be used as long as it does not cause a sudden turbulence in the flow.

  Further, the chamfered portions 3c formed at the corners of the peripheral portion of the substrate 3 are formed at the four corners, so that from which direction the horizontal or vertical direction of the substrate 3 is a predetermined angle θ (for example, 2 ° or 3 °). Even when the substrate 3 is brought into contact with the rubbing roller 2 with the angle (°), the chamfered portion 3c does not disturb the flow of the cross hairs such as fluffing of the cloth and cracks on the peripheral surface 2b of the rubbing roller 2. .

  Further, when the rubbing direction is determined, the chamfered portion 3c of the substrate 3 does not have to be formed in all four corners. As shown in FIG. When the direction is brought into contact with the rubbing roller 2 with a predetermined angle θ, a chamfered portion 3cf having a curved shape may be formed only at the corner portion of the substrate 3 that first comes into contact with the rubbing roller 2. .

  In this case, a sudden disturbance occurs in the cross hair flow such as fluffing and fuzzing on the peripheral surface 2b of the rubbing roller 2 due to the shape of the chamfered portion 3cf of the substrate 3 to which the rubbing roller 2 first contacts. Can be prevented. As a result, there is no problem that the alignment film on the display area of the substrate 3 is disturbed and rubbing unevenness occurs.

  When the chamfered portion 3cf is formed only at the corner portion of the substrate 3 that first contacts the rubbing roller 2, the chamfered portion 3cf of the substrate 3 is orthogonal to the rubbing processing direction of the substrate 3, as shown in FIG. In detail, it may be formed in a direction perpendicular to the advancing direction of the rubbing roller 2 or the pallet 5.

  As a result, since the surface orthogonal to the advancing direction of the rubbing roller 2 or the pallet 5 does not have a right-angled shape, the chamfered portion 3cf is formed on the peripheral surface 2b of the rubbing roller 2 with which the chamfered portion 3cf first contacts. Does not cause any disturbance in the hair flow of the cloth, such as fuzzing and cracking of the cloth.

  Further, if the chamfered portion 3cf is formed only in the corner portion of the substrate 3 that first contacts the rubbing roller 2, the chamfered portion 3cf is used when assembling a liquid crystal display device used in an electronic apparatus using the substrate 3 after the rubbing process. Since this serves as a mark at the time of assembly, the board assembly direction is not mistaken.

  Further, the chamfered portion 3cf of the substrate 3 that first contacts the rubbing roller 2 may have a polygonal shape having an obtuse angle as shown in FIG.

  The chamfered portions 3c formed at the four corners of each substrate 3 or the chamfered portions 3cf formed at the corners that first contact the rubbing roller 2 are formed on surfaces that are inclined in the plate thickness direction. Also good. For example, a chamfered portion 3cf may be formed in the upper half of the corner portion in the thickness direction.

  Specifically, the chamfered portions 3c formed at the four corners of each substrate 3 or the chamfered portions 3cf formed at the corners that first contact the rubbing roller 2 are replaced with the corners as shown in FIGS. In the upper half 3u in the thickness direction, two surfaces 3c and 3d are formed on the chamfered portion. Of course, the number of faces may be two or more. Or you may form so that a chamfering part may have a curved-surface shape as shown in FIG. 9, FIG.

  Also in this case, when the rubbing process is performed with the traveling direction of the pallet 5 parallel to the rubbing direction, the horizontal or vertical direction of the substrate 3 is brought into contact with the rubbing roller 2 with a predetermined angle θ. Since the chamfered portion does not have a right-angled shape, the chamfered portion 3c does not disturb the flow of the cross, such as fluffing of the cross and fuzzing on the peripheral surface 2b of the rubbing roller 2.

  Even when the chamfered portion of the substrate 3 is formed in a stepped shape, the chamfered portion 3cf of the substrate 3 is orthogonal to the advancing direction of the rubbing roller 2 or the pallet 5, as shown in FIG. If it is formed in the direction, the chamfered portion 3c will not cause any disturbance in the flow of the cross, such as fluffing of the cloth and cracking, on the peripheral surface 2b of the rubbing roller 2.

  Next, a method for rubbing the substrate thus configured will be described with reference to FIG. FIG. 11 is a flowchart showing a method for manufacturing the substrate of the liquid crystal display device of FIG. 1, more specifically, a rubbing method.

  First, as shown in FIG. 11, in step S1, four corner portions of the peripheral portion of each substrate 3 obtained by cutting out a substrate made of a large plate of, for example, 8 inches or more manufactured in each manufacturing process into a predetermined size. Alternatively, the chamfered portion is formed in the shape described above at the corner portion that first contacts the rubbing roller 2 during the rubbing process. Thereafter, the process proceeds to step S2.

  In step S2, the alignment film 3h is formed on each substrate 3 on which the four chamfered portions 3c at the peripheral edge or the chamfered portion 4cf with which the rubbing roller 2 first comes into contact during the rubbing process is formed. The process proceeds to S3.

  Finally, in step S3, each substrate 3 on which the alignment film 3h is formed is placed on the pallet, and one side of the substrate 3 is inclined at a specific angle with respect to the relative traveling direction of the substrate 3 and the rubbing roller 2, A rubbing process is performed on the alignment film 3h on the substrate 3 so that the traveling direction of the pallet 5 is parallel to the rubbing direction so that the rubbing roller 2 first contacts the chamfered portion 3c or the chamfered portion 3cf.

  Since the substrate 3 is rubbed by such a method, when the rubbing process is performed with the traveling direction of the pallet 5 parallel to the rubbing direction, the horizontal or vertical direction of the substrate 3 is set at a predetermined angle θ. Therefore, when the chamfered portion 3c or the chamfered portion 3cf does not have a right-angled shape when being brought into contact with the rubbing roller 2, the chamfered portion 3c or the chamfered portion 3cf is formed on the peripheral surface 2b of the rubbing roller 2 with fluff of cloth. Does not cause disturbance in the hair flow of the cloth, such as cracks.

  Therefore, depending on the shape of the chamfered portion 3c or the chamfered portion 3cf formed at the corner of the substrate 3 in contact with the rubbing roller 2, the cross hair flow such as fluffing of the cloth, fuzzing, etc. is generated on the peripheral surface 2b of the rubbing roller 2. It is possible to prevent sudden disturbance.

  As a result, it is possible to prevent the occurrence of such a problem that linear rubbing unevenness occurs in the alignment film on the display region of the substrate 3.

  Further, when the liquid crystal display device 70 configured using the substrate 3 after the rubbing process is used in a projector such as a projector, as shown in FIG. The streak 200 is not projected. Therefore, the liquid crystal display device can be manufactured with a high yield.

  In the present embodiment, the rubbing process for the substrate 3 is shown to be performed with the traveling direction of the pallet 5 and the rubbing direction parallel to each other. However, as shown in FIG. Even if the rubbing process is performed using bias rubbing whose direction does not match, the same effect as in the present embodiment can be obtained.

  The bias rubbing is a technique for preventing the unevenness of rubbing due to foreign matter on the rubbing roller 2 from being localized by making the traveling direction and the rotating direction (= rubbing direction) of the substrate 3 different. Further, the chamfered portion of the corner portion of the substrate 3 has been shown to be formed by a grinder. However, the present invention is not limited to this, and may be formed by etching as long as it can be processed into the shape described above. When cutting out, a chamfer may be formed at the corner.

  Further, although the substrate 3 is shown as having a rectangular shape, the substrate 3 is not limited thereto, and may be a substrate having a square shape. In this case as well, the same effect as in the present embodiment can be obtained.

  Further, in the present embodiment, an alignment film is formed on a substrate having a large size of, for example, 8 inches or more, which is manufactured in each manufacturing process of the substrate, and is cut out to a specified size. However, the present invention is not limited to this, but the alignment film 3h is formed on a large plate and the rubbing process is performed on the alignment film 3h. Needless to say, it can be applied.

  Further, an example in which the alignment film 3h formed on the counter substrate 3 is rubbed is shown. However, even if the alignment film 9h formed on the TFT substrate 9 is rubbed, the same effect as in the present embodiment is obtained. Can be obtained.

  Further, when the alignment film 3 h formed on the substrate 3 is rubbed, a plurality of substrates 3 are placed on the pallet 5, moved by the guide 6 on the reference plane 4 a, and placed on the pallet 5. Although the rubbing process is performed on the alignment film 3h by bringing the plurality of substrates 3 into contact with the rubbing roller 2 respectively, the substrate is not limited to this, and the substrate 3 can be moved by moving the rubbing roller 2 relative to the substrate 3. Of course, the alignment film 3h on the surface 3 may be rubbed.

  As an example of the liquid crystal display device applied to the present embodiment, an active matrix liquid crystal display device using a TFT element is shown as an example. However, the present invention is not limited to this, and an active element such as a TFD (thin film diode) is used. The present invention may be applied to an active matrix liquid crystal display device using (active elements).

  In addition, examples of electronic devices to which the liquid crystal display device according to the present invention can be applied include portable telephones, portable information devices called PDA (Personal Digital Assistants), portable personal computers, personal computers, digital still cameras, and in-vehicle monitors. , Digital video cameras, liquid crystal televisions, viewfinder type, monitor direct-view type video tape recorders, car navigation devices, pagers, electronic notebooks, calculators, word processors, workstations, video phones, POS terminals, etc. Equipment.

1 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a schematic perspective view illustrating an example of a configuration of a main part of a rubbing apparatus for rubbing an alignment film formed on a counter substrate of the liquid crystal display device of FIG. 1. The principal part schematic plan view which shows having formed the chamfering part in the corner | angular part of the four corners of the board | substrate used for the liquid crystal display device of FIG. FIG. 2 is a main part partial schematic plan view showing that chamfered portions are formed only at corners of the substrate that first contacts the rubbing roller among the four corners of the substrate used in the liquid crystal display device of FIG. 1. FIG. 5 is a main part partial schematic plan view showing that the surface of the chamfered portion of the substrate of FIG. 4 that first contacts the rubbing roller is formed in a direction orthogonal to the rubbing direction of the substrate. The principal part part schematic plan view which shows having formed the chamfering part of the board | substrate of FIG. 3 or FIG. 4 with a polygonal shape. The principal part part schematic perspective view which shows having formed so that the chamfering part of the board | substrate 3 of FIG. 3 or FIG. 4 might consist of a some surface. The longitudinal cross-sectional view which follows the VIII-VIII line in FIG. The principal part part schematic perspective view which shows having made the chamfer part of FIG. 7 into the curved surface shape. The longitudinal cross-sectional view which follows the IX-IX line of FIG. 2 is a flowchart showing a method for rubbing a counter substrate of the liquid crystal display device of FIG. 1. The principal part schematic plan view which shows the example which gives a bias rubbing to the board | substrate used for the liquid crystal display device of FIG. The principal part schematic plan view which shows the example which performs the rubbing process by making the direction of the one side of a board | substrate parallel to the rubbing direction. The principal part schematic plan view which shows the example of the rubbing process of the conventional board | substrate. The figure which shows the example which the rubbing nonuniformity produced in the screen of a liquid crystal display device. The principal part schematic plan view which shows the other example of the rubbing process of the conventional board | substrate.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Rubbing roller, 2b ... Roller peripheral surface, 3 ... Counter board | substrate, 3c ... Chamfering part (corner part), 3cf ... Chamfering part (corner part) which contact | abuts a rubbing roller first, 3h ... Orientation film, 5 ... Pallet.

Claims (9)

In a liquid crystal display device in which liquid crystal is sandwiched between a pair of rectangular substrates,
A liquid crystal display device, wherein a chamfered portion is formed in at least one of four corners of at least one of the pair of substrates.   2. The liquid crystal display device according to claim 1, wherein the surface of the chamfered portion is formed so as to be orthogonal to a direction of a rubbing process performed on an alignment film formed on the substrate.   The liquid crystal display device according to claim 1, wherein the chamfered portion has a curved shape.   The liquid crystal display device according to claim 1, wherein a surface of the chamfered portion is formed to have a polygonal shape.   The liquid crystal display device according to claim 1, wherein the chamfered portion has a surface inclined in a plate thickness direction. In a method for manufacturing a liquid crystal display device in which a liquid crystal is sandwiched between a pair of rectangular substrates,
Chamfering at least one of four corners of at least one of the pair of substrates; and
Forming an alignment film on the chamfered substrate;
A step of rubbing the alignment film;
In the step of performing the rubbing treatment, the one side of the substrate is inclined at a specific angle with respect to the traveling direction of the rubbing roller with respect to the substrate, and the rubbing roller first contacts the chamfered portion of the substrate. A method of manufacturing a liquid crystal display device, comprising fixing a substrate.   The method for manufacturing a liquid crystal display device according to claim 6, wherein the rubbing process is performed by placing a plurality of the rectangular substrates on a pallet. In the rubbing process,
8. The method of manufacturing a liquid crystal display device according to claim 6, wherein the rubbing roller is moved in a direction different from the rubbing direction with respect to the substrate.   An electronic apparatus using the liquid crystal display device according to claim 1.

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