JP5403586B2 - Liquid crystal display device and manufacturing method thereof - Google Patents

Description

The present invention relates to a liquid crystal display device in which a sealant is applied in a uniform amount and at an accurate position by a dispenser, and a method for manufacturing the same, and more particularly, the present invention relates to a film made of a light-impermeable material on a transparent substrate. The present invention relates to a liquid crystal display device in which a laser beam of a dispenser can be stably received by being formed and a sealing material is applied in a uniform amount and at an accurate position, and a manufacturing method thereof.

The liquid crystal display device is manufactured by bonding an array substrate having a transparent substrate made of glass or the like and a color filter substrate through a spacer and a sealing material. As a method for applying the sealant, there are a dispenser application method in which a sealant is applied using a dispenser and a screen printing method. Recently, the dispenser application method has become mainstream. In the dispenser coating method, it is important to apply a uniform amount of the sealing material filled in the dispenser onto the substrate and to apply the sealing material at an accurate position.

If the sealing material is not applied in a uniform amount and at the correct position, the cell gap between the substrates of the liquid crystal display device may not be kept uniform and distortion may occur, and the sealing material may enter the display area. There is a risk that display failure may occur due to this, or liquid crystal leakage may occur due to poor application of the sealing material.

In order to solve this problem, Patent Document 1 listed below discloses an invention relating to a sealant application device suitable for applying a sealant during the manufacture of a liquid crystal display device. The sealing agent application device disclosed in the following Patent Document 1 accommodates the sealing agent, and in the sealing agent application device having an opening for flowing the sealing agent at the lower end, the high pressure air acts on the sealing agent liquid surface, The opening is provided with a coating nozzle in which a spherical ball is fitted and supported so as to be able to roll.

By adopting such a configuration, in the sealing agent application apparatus disclosed in Patent Document 1 below, the spherical ball is in contact with the alignment film during application of the sealing agent, but the contact portion has a seal. Since the agent is applied and the spherical ball is rolling, the alignment film is not damaged. Also, during coating, due to the rotation of the spherical ball, the density of the sealing agent in the vicinity of the spherical ball is lower on the opposite side than the coating direction of the sealing agent, and the bubbles in the sealing agent pressurized to high pressure have a density. It escapes to the lower side and is discharged to the outside of the sealant application nozzle, so that bubbles are not mixed in the applied sealant, and the sealant can be applied without interruption.

Further, as a conventional method of applying a sealing material by a dispenser, a method of applying a sealing material in a uniform amount at an accurate position by controlling the position of the dispenser is known. That is, using a dispenser that has been subjected to position control in the Z-axis direction, the substrate, which is an object to be coated, is moved in the X-axis direction and the Y-axis direction by an XY stage to apply the sealing material. One of the important parameters at this time is control of the distance (clearance) between the dispenser nozzle and the substrate. The dispenser position control method will be described with reference to FIG.

  FIG. 10 is a schematic cross-sectional view showing a sealing material application process using a conventional dispenser.

In this position control method of the dispenser 50, the laser beam generator 51 driven together with the dispenser 50 is the object to be coated from the front side and the side with respect to the direction of application of the dispenser nozzle 52 (front side in FIG. 10). The substrate 53 is irradiated with laser light 54, the reflected light 55 is received by the light receiving device 56 from the opposite side across the dispenser nozzle 52, and the distance H between the dispenser nozzle 52 and the substrate 53 is calculated and controlled. ing.

JP 05-269422 A

However, as shown in FIG. 10, the surface of the substrate 53 that is the object to be coated is a transparent material layer 57.
However, the laser beam 54 is reflected on the substrate surface 58 under the transparent material layer 57. Since a wiring pattern 59 formed of a metal film is disposed on the substrate surface 58, the substrate surface 58 is uneven. Since the laser beam 54 is irregularly reflected by the unevenness of the substrate surface 58, various reflected lights 55 corresponding to the irregularities of the substrate surface 58 are incident on the light receiving device 56. This irregularly reflected light adversely affects the calculation of the distance H between the dispenser nozzle 52 and the substrate 53 to be coated. Therefore, the distance H between the dispenser nozzle 52 and the substrate 53 to be coated is kept constant. The sealing material 60 may not be applied in a stable state.

Moreover, in the sealing agent application | coating apparatus currently disclosed by the said patent document 1, a sealing agent can be apply | coated irrespective of various metal wiring formed in the board | substrate once. However, in this sealant application device, the sealant is extruded by blowing air at high pressure, so the amount of sealant applied is not always uniform, and the sealant is applied by rolling a spherical ball. Therefore, it is difficult to stably apply the sealing material at an accurate position.

The present invention has been made in view of the above problems, and by forming a film made of a light-impermeable material at a position overlapping with a path through which laser light passes along the coating pattern of the sealing material, The laser beam can be stably reflected without being affected by various metal wirings formed, and between the dispenser and the transparent material layer by receiving the reflected light. The distance is accurately calculated, so that the position control of the dispenser in the Z-axis direction can be accurately performed, and the sealing material can be applied stably on the transparent material layer, and the present invention is completed. It has come to be.

That is, an object of the present invention is to provide a liquid crystal display device in which a sealing material is applied in a uniform amount and stably in an accurate position, and a manufacturing method thereof.

In order to achieve the above object, a liquid crystal display device of the present invention has a pair of substrates having at least one transparent material layer formed on opposite surfaces, and the periphery of the pair of substrates is on the surface of the transparent material layer. They are bonded together by the applied sealing material, in a liquid crystal display device in which liquid crystal is sealed inside, on the surface or lower surface of the transparent material layer, along the coating pattern of the sealing material, the sheet Lumpur material coating dispensers A film made of a light-impermeable material that reflects the laser beam is formed at a position overlapping with a path through which the positioning laser beam passes.

In the liquid crystal display device of the present invention, the position overlapping the surface or the lower surface of the transparent material layer formed on the substrate along the path through which the positioning laser beam of the dispenser for sealing material passes passes along the coating pattern of the sealing material. In addition, a film made of a light-impermeable material that reflects laser light is formed. The transparent material layer is usually formed on the surface of the passivation film. The surface of the passivation film has at least unevenness of various metal wirings (hereinafter simply referred to as “various wirings”) such as gate wiring and source wiring formed on the substrate, and the transparent material layer is flattened. As sometimes referred to as a film, the surface is more planarized. That is, the film made of light-impermeable material formed on the lower surface of the transparent material layer is flattened more than various wirings, and the film made of light-impermeable material formed on the surface of the transparent material layer is extremely It is flat.

Accordingly, in the liquid crystal display device of the present invention, the laser beam can be stably reflected without being affected by the unevenness of various wirings, so that a film made of a light-impermeable material accurately while applying a sealing material. It becomes possible to receive the laser beam reflected by the laser beam. Further, in the liquid crystal display device of the present invention, since the distance between the tip of the dispenser and the transparent material layer is accurately calculated, the position of the dispenser can be accurately controlled, and a uniform amount can be accurately sealed. The material can be applied. Therefore, according to the liquid crystal display device of the present invention, since the sealing material is applied at an accurate position in a uniform amount, the cell gap between the pair of substrates is kept uniform, and the sealing material is used in the liquid crystal display unit. It is possible to suppress display defects caused by entering the liquid crystal, and it is also possible to suppress liquid crystal leakage due to poor application of the sealing material. In addition, what is necessary is just to form the film | membrane which consists of this light-impermeable material suitably in the inner side or the outer side of the formation position of the sealing material of a liquid crystal display device.

Note that in a liquid crystal display device, a thin film transistor (TFT) as a switching element.
The surface of the thin film transistor is covered with a passivation film. In a vertical electric field type liquid crystal display device, there is a type in which an interlayer resin film is formed on the surface of a passivation film and a pixel electrode is formed on the surface of the interlayer resin film. Also, a horizontal electric field type liquid crystal display device, for example, fringe field switching (FFS)
In some ld Switching mode liquid crystal display devices, an interlayer resin film is formed on the surface of the passivation film, and a lower electrode, an interelectrode insulating film, and an upper electrode are sequentially stacked on the surface of the interlayer resin film. . In such a liquid crystal display device, in the application area of the sealing material,
In the case of the vertical electric field method, a passivation film and an interlayer resin film are formed, and in the case of the horizontal electric field method, at least a passivation film and an interlayer resin film are formed. Therefore, the liquid crystal display device of the present invention can exhibit the predetermined effect as described above if a film made of a light-impermeable material is formed on the surface or the lower surface of the transparent resin film. It can be applied to any of the above and the horizontal electric field type.

As positioning control using laser light, for example, a laser light generating means such as a laser diode and a light receiving device are provided, and the laser light irradiated from the laser light generating means is used as a light-impermeable material in the vicinity of the seal material application position The distance between the tip of the dispenser and the transparent resin film is calculated by reflecting the light on a film made of If a plurality of laser light generating means and light receiving devices are provided, the distance between the tip of the dispenser and the substrate surface can be calculated more accurately.

In the liquid crystal display device according to the present invention, it is preferable that the film made of the light impermeable material is made of metal.

Since the metal material has a high reflectivity, the laser light is efficiently reflected, so that it is possible to position the dispenser with high accuracy and to apply a more stable sealing material.
Examples of metals having high reflection efficiency include aluminum, aluminum alloys, gold, silver, and copper. Aluminum and aluminum alloys that are used as various wirings for liquid crystal display devices are preferable.

In the liquid crystal display device according to the present invention, it is preferable that the film made of the light-impermeable material is formed in a solid shape.

In the liquid crystal display device of the present invention, since the film made of an impermeable material is formed in a solid shape so as to overlap with the path through which the laser beam passes, the reflected laser beam is continuously reflected without interruption. Therefore, the position of the dispenser can always be controlled stably. Therefore, according to the liquid crystal display device of the present invention, it is possible to obtain a liquid crystal display device that can achieve the above-described effects more favorably.

In the liquid crystal display device according to the present invention, the film made of the light impermeable material may be formed intermittently.

In the liquid crystal display device of the present invention, there may be a portion where a film made of an impermeable material is formed and a portion where the film is not formed. At locations where a film made of impermeable material is not formed, it is based on the distance between the tip of the dispenser measured at the location where the film made of impermeable material is formed and the membrane made of impermeable material. it is possible to control the position of the dispenser have Dzu. Therefore, according to the liquid crystal display device of the present invention, since the film made of the impermeable material may be formed in a limited narrow region, the film made of the impermeable material against the liquid crystal molecules when the liquid crystal display device is driven. It is possible to suppress the influence of the electric field generated on the substrate.

In the liquid crystal display device according to the present invention, the liquid crystal display device is intended to operate in a fringe field S w Tsu quenching mode, the transparent material layer, an inorganic insulating formed on the surface of the resin film and the resin film The film including the film and made of the light-impermeable material may be formed on the surface of the inorganic insulating film or between the inorganic insulating film and the resin film.

In the liquid crystal display device operating in the FFS mode, an interelectrode insulating film made of an inorganic insulating film formed between the lower electrode and the upper electrode is formed on the surface of the resin film as a transparent material layer even in the sealing material application region. There is something to offer. In such an FFS mode liquid crystal display device, the passivation film, the resin film, and the inorganic insulating film serve as a transparent material layer, but the surface of the inorganic material layer or between the inorganic insulating film and the resin film does not transmit light. Even when a film made of a material is formed, a liquid crystal display device having the above-described effects can be obtained.

Furthermore, in order to achieve the above object, a method for manufacturing a liquid crystal display device of the present invention includes:
(1) A pair of substrates for a liquid crystal display device, wherein a transparent material layer is formed on at least the surface of the pair of substrates facing the other substrate, and the surface of the transparent material layer Alternatively, on the lower surface, a film made of a light-impermeable material is formed at a position overlapping with a path through which a positioning laser beam of a dispenser for applying a sealing material passes along a sealing material application pattern. Preparing a pair of substrates for the device;
(2) While irradiating the film made of the light-impermeable material with the positioning laser light of the dispenser for applying the sealing material, the reflected light from the film made of the light-impermeable material is received and Obtaining a distance between the tip position and the transparent material layer, and applying a sealing material while controlling the position of the dispenser so that the distance is constant;
(3) bonding the pair of substrates and enclosing the liquid crystal;
It is characterized by having.

According to the method for manufacturing a liquid crystal display device of the present invention, it is possible to easily manufacture the liquid crystal display device of the present invention having the above effects.

It is a top view of the liquid crystal display device common to Embodiments 1-4 of this invention. It is an enlarged view of 1 pixel of the liquid crystal display device of the vertical electric field system common to Embodiments 1-3. It is sectional drawing of the III-III line of FIG. It is sectional drawing of the IV-IV line of FIG. FIG. 5A is a partial plan view of a state of the array substrate of the first embodiment on the mother substrate, and FIG. 5B is a partial schematic view of a mother substrate-like sealing material application process. It is sectional drawing in the VI-VI line of FIG. 6B seen from the advancing direction of a dispenser. 7A is a plan view of an array substrate of a liquid crystal display device according to Embodiment 2, FIG. 7B is an enlarged view of a VIIB portion of FIG. 7A, and FIG. 7C is an enlarged view of a VIIC portion of FIG. 7A. 8A is a cross-sectional view corresponding to FIG. 4 of the liquid crystal display device of Embodiment 3, and FIG. 8B is a cross-sectional view corresponding to FIG. 6B. 9A is a cross-sectional view corresponding to FIG. 4 of the liquid crystal display device of Embodiment 4, and FIG. 9B is a cross-sectional view corresponding to FIG. 6B. It is the schematic cross section which showed the application | coating process of the sealing material by the dispenser in the conventional liquid crystal display device.

Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a liquid crystal display device and a manufacturing method thereof for embodying the technical idea of the present invention, and the present invention is specified to the liquid crystal display device and the manufacturing method thereof. And other embodiments within the scope of the claims are equally applicable. In each drawing used for the description in this specification, each layer and each member are displayed in different scales so that each layer and each member can be recognized on the drawing. However, it is not necessarily displayed in proportion to the actual dimensions. The “surface” of the array substrate and the color filter substrate described here indicates a surface on which various wirings are formed.

FIG. 1 is a plan view of a liquid crystal display device common to the first to fourth embodiments of the present invention. FIG. 2 is an enlarged view of one pixel of a vertical electric field type liquid crystal display device common to the first to third embodiments. FIG. 3 shows the structure of FIG.
It is sectional drawing of the -III line. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5A is a partial plan view of a state of the array substrate of the first embodiment on the mother substrate, and FIG. 5B is a partial schematic view of a mother substrate-like sealing material application process. 6 is a view of the dispenser as viewed from the direction of travel.
It is sectional drawing in the VI-VI line of B. 7A is a plan view of an array substrate of a liquid crystal display device according to Embodiment 2, FIG. 7B is an enlarged view of a VIIB portion of FIG. 7A, and FIG. 7C is an enlarged view of a VIIC portion of FIG. 7A. 8A is a cross-sectional view corresponding to FIG. 4 of the liquid crystal display device of Embodiment 3, and FIG.
B is a cross-sectional view corresponding to FIG. 6B. 9A is a cross-sectional view corresponding to FIG. 4 of the liquid crystal display device of Embodiment 4, and FIG. 9B is a cross-sectional view corresponding to FIG. 6B.

[Embodiment 1]
As shown in FIG. 1, the liquid crystal display device 10 according to the first embodiment includes an array substrate 11 and a color filter substrate 26, a sealing material 33 for bonding the substrates 11 and 26, and the array substrate 11 and the color filter substrate 26. And a liquid crystal LC (see FIG. 4) sealed in a region surrounded by the sealing material 33, a so-called COG (Chip On Glass) type liquid crystal display device. In the liquid crystal display device 10, a region surrounded by the sealing material 33 forms a display region 42, and the frame of the liquid crystal display device 10 includes the outside of the display region 42, that is, the region to which the sealing material 33 is applied. The part becomes a non-display area 43. Further, a transparent resin film (interlayer film) 20 (see FIGS. 3 and 4) of the array substrate 11 of the liquid crystal display device 10 according to the first embodiment is formed. Here, the transparent resin film 20 corresponds to the transparent material layer of the present invention, and a metal film 39 is formed on the surface of the transparent resin film 20 in a solid shape inside the position where the sealing material 33 is formed.

The array substrate 11 is obtained by forming various wirings for driving liquid crystal on the surface of a rectangular first transparent substrate 12 made of glass or the like. The array substrate 11 is longer in the longitudinal direction than the color filter substrate 26, and an extended portion 12a extending to the outside when the substrates 11 and 26 are bonded together is formed. The extension portion 12a is provided with a driver Dr made of an IC chip or an LSI that outputs a drive signal.

As shown in FIG. 2, in the display area 42 of the array substrate 11, a plurality of scanning lines 13 and signal lines 14 are formed in a matrix, and the plurality of scanning lines 13 and signal lines 14 are
It extends outside the display area 42 and is connected to a plurality of gate lead lines and source lead lines. The gate lead line and the source lead line are routed outside the display area 42 and one end thereof is connected to the driver Dr.

Further, in the display area 42 of the array substrate, in addition to the plurality of scanning lines 13 and the signal lines 14, a plurality of auxiliary capacitance lines 15 provided between the plurality of scanning lines 13 and parallel to the scanning lines 13. When,
A TFT 17 as a switching element composed of a source electrode S, a gate electrode G, a drain electrode D, and a semiconductor layer 16, and a pixel electrode 2 covering a region surrounded by the scanning line 13 and the signal line 14
1 is provided. Further, a region surrounded by the plurality of scanning lines 13 and signal lines 14 forms one pixel region PA.

Next, with reference mainly to FIG. 2 and FIG. 3, a manufacturing process of various wirings formed on the surface of the array substrate 11 will be briefly described. First, a conductive material made of aluminum, molybdenum, chromium, titanium, or an alloy thereof having a predetermined thickness is formed on the transparent substrate 12. Then, by patterning using a photolithography method, a part thereof is removed by etching, a plurality of scanning lines 13 extending in the row direction, a gate electrode G extending from the scanning line 13, and the plurality of scanning lines. An auxiliary capacitance line 15 located between the lines 13, an auxiliary capacitance electrode 15a formed by expanding a part of the auxiliary capacitance line 15, a gate lead line, and a common lead line (not shown) are formed. To do.

Next, a gate insulating film 18 having a predetermined thickness is formed so as to cover the transparent substrate 12 on which the scanning lines 13 and the auxiliary capacitance lines 15 are formed by the above process. As the gate insulating film 18, a transparent inorganic insulating material made of silicon nitride, silicon oxide or the like is used.

Next, a semiconductor layer made of amorphous silicon (a-Si) or the like is formed on the gate insulating film 18. Then, the semiconductor layer is removed by etching, leaving a portion covering the gate electrode G, and TF
A semiconductor layer 16 to be a part of T17 is formed. Further, by the same method, a conductive material is further formed on the transparent substrate 12 on which a plurality of layers are formed in the above-described process, and a plurality of signal lines 14 extending in a direction intersecting the scanning lines 13 and the signal lines are formed. A source electrode S extending from 14 and formed so as to partially overlap the semiconductor layer 16, and a drain formed so as to cover the auxiliary capacitance electrode 15a and have one end partially overlapped with the semiconductor layer 16. Electrode D and source lead line (
(Not shown). Thereby, the scanning line 13 and the signal line 14 of the transparent substrate 12 are displayed.
A TFT 17 is formed in the vicinity of the intersection with the.

Further, a passivation film 19 made of an inorganic insulating material made of silicon oxide or silicon nitride for stabilizing the surface is formed so as to cover these various wirings, and then the surface of the array substrate 11 is flattened. An interlayer film 20 made of an organic resin material is formed. The passivation film 19 and the interlayer film 20 correspond to the transparent material layer of the present invention. This interlayer film 2
A contact hole CH for electrically connecting a pixel electrode 21 and a drain electrode D, which will be described later, is provided in a portion of the passivation film 19 located on the auxiliary capacitance electrode 15a. A pixel electrode 21 made of, for example, ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide) is provided for each pixel area PA surrounded by the scanning lines 13 and the signal lines 14.
Form.

Further, as shown in FIG. 4, in the liquid crystal display device 10 according to the first embodiment, a metal film 39 as a film made of a light-impermeable material is formed in a solid shape inside the seal material 33. This metal film 39 is for reflecting a laser beam 40 to be described later, and the metal film 39 may be any material as long as it can reflect the laser beam 40. Therefore, the metal film 39 is usually used for various wirings of a liquid crystal display device. A material having high reflectivity such as aluminum or aluminum alloy used in the above can be used. The metal film 39 can be formed by a photolithography method and an etching method. The array substrate 11 of the first embodiment is manufactured through the above steps.

As shown in FIG. 3, the color filter substrate 26 contains a resin material, for example, a black pigment, formed on the second transparent substrate 27 made of glass or the like so as to match the pixel area PA of the array substrate 11. A light shielding film 28 made of resin and a color filter layer 29 of red (R), green (G), blue (B), etc. provided in a region surrounded by the light shielding film 28 are provided. However, the present invention is not limited to this, and there may be no color filter layer for black-and-white display. In the case of color-complementary color display, it is composed of three or more color filter layers instead of the three primary colors. There is also a case.

The light shielding film 28 provided on the color filter substrate 26 is formed using a photolithography method or the like. The color filter layer 29 is formed in a so-called stripe arrangement in which a plurality of openings arranged in series in one direction are covered with a color filter layer 29 of each color for a plurality of openings formed in a lattice pattern by the light shielding film 28. Has been.

Next, an overcoat layer 30 is formed on the surfaces of the light shielding film 28 and the color filter layer 29. The overcoat layer 30 is formed of a material having high adhesion to the sealing material 33 made of a transparent resin, and prevents impurities from diffusing from the color filter layer 29 into the liquid crystal layer to deteriorate the liquid crystal. It is formed for this purpose.

A common electrode 31 made of a transparent conductive material such as ITO or IZO is provided on the substrate 26 on which the overcoat layer 30 is formed so as to cover the display region 42. Further, at least one portion of each corner of the common electrode 31 is an extended portion 12a extending to the outside of the display region 42, and this extended portion 12a is arrayed via a contact material (see FIG. 1) 32. Substrate 11
It is connected to a common lead line (not shown) and is electrically connected to the driver Dr.

The sealing material 33 is used to bond the outer peripheries of the array substrate 11 and the color filter substrate 26 and is formed of a thermosetting or ultraviolet curable resin material. The sealing material 33 is applied along the outer edge of the display area 42 of the array substrate 11,
A part thereof extends toward the side edge of the array substrate 11 in order to form the liquid crystal injection hole 34. The application process of the sealing material 33 will be described later.

The array substrate 11 and the color filter substrate 26 are arranged so that their surfaces face each other. For example, columnar spacers (not shown) are disposed in the display region 42 of the color filter substrate 26, and They are bonded together by a sealing material 33 applied over the outer periphery. The liquid crystal display device 10 according to the first embodiment is assembled by injecting the liquid crystal LC from the liquid crystal injection port 34 and sealing the liquid crystal injection port 34 with the sealing material 35.

Next, a sealing material application process of the liquid crystal display device 10 according to the first embodiment will be described with reference to FIGS.

The seal material 33 is applied by, for example, a dedicated dispenser 36 along the outer edge of the display area 42 of the array substrate 11, and a part of the seal material 33 is directed toward the side edge of the array substrate 11 to form the liquid crystal injection port 34. It extends. Since a plurality of array substrates 11 are formed on the mother substrate 11M in the manufacturing process of the array substrate 11, the sealing material 33 is applied across the plurality of array substrates 11 in a so-called one-stroke manner as shown in FIG. 5A. Go. The dispenser 36 includes a laser light generator 37 and a light receiver 38 for controlling the position of the dispenser 36 (see FIG. 5B).

In the liquid crystal display device 10 according to the first embodiment, as described above, the metal film 39 is formed in a solid shape on the inner side where the sealing material 33 is formed. The metal film 39 overlaps the path through which the positioning laser beam 40 (see FIG. 6) of the dispenser 36 of the sealing material 33 passes,
For example, it is formed along the inside of the formation position of the sealing material 33.

In the step of applying the sealing material 33, as shown in FIG. 5B, when the sealing material 33 is applied by the dispenser 36, as shown in FIG.
0 is irradiated from the laser light generator 37 and reflected by the metal film 39 formed on the interlayer film 20, and the reflected light 41 is received by the light receiving device 38, so that the thickness of the metal film 39 is taken into consideration. A distance H between the tip of the dispenser 36 and the interlayer film 20 is calculated. Note that FIG.
An arrow P shown in B represents the traveling direction of the dispenser 36. The dispenser 36 applies the sealing material 33 to the sealing material forming position while keeping the calculated distance H constant.

Further, since the various metal wirings L are not so thick as to affect the flatness of the surface of the interlayer film 20 formed thereon, the surface of the interlayer film 20 is usually flat and is not formed on the interlayer film 20. The surface of the formed metal film 39 is also flat. Therefore, according to the liquid crystal display device 10 of the first embodiment, since the metal film is formed on the flat interlayer film 20, the irregular reflection of the laser light 40 is suppressed. Thus, the liquid crystal display device 10 in which the sealing material 33 is accurately applied in a uniform amount onto 20 is obtained. Further, since the metal film 39 is formed in a solid shape, the laser beam can be reflected stably without interruption. Further, the metal film 39
Since the reflectance is high, the laser light can be stably reflected also by this. FIG. 5B shows an example in which two pairs of laser light generators and light receivers are used. However, the purpose is to calculate a more accurate distance, and only one pair may be used.

As described above, according to the liquid crystal display device 10 according to the first exemplary embodiment, since the sealing material 33 is applied in a precise amount at a uniform amount, the cell gap between the pair of substrates of the liquid crystal display device 10 is kept uniform. In addition, display defects caused by the sealing material 33 entering the liquid crystal display region 42 can be suppressed. Furthermore, liquid crystal leakage due to poor application of the sealing material 33 can be suppressed.

[Embodiment 2]
In the liquid crystal display device 10 of the first embodiment, an example in which the metal film 39 as a film made of a light-impermeable material is formed in a solid shape is shown. However, in the liquid crystal display device 10A of the second embodiment, the metal film 39 is intermittently formed. A typical example will be described. Note that the liquid crystal display device 10A according to the second embodiment is different from the liquid crystal display device 10 according to the first embodiment only in the formation of the metal film, and therefore the same reference numerals are used for the same components as the liquid crystal display device 10 according to the first embodiment. The detailed description is omitted.

As described above, the metal film 39 in the liquid crystal display device 10 according to the first embodiment has the laser beam 4.
In order to stably reflect 0, the sealing material 33 is formed in a solid shape at a position overlapping with a path through which the positioning laser light 40 of the dispenser 36 passes. This is to prevent the laser light 40 from being irregularly reflected by the various metal wirings L formed on the array substrate 11. However, it is necessary to calculate the distance H between the tip end portion of the dispenser 36 and the interlayer film 20 of the array substrate 11 in places where various metal wirings L do not exist on the array substrate 11 or where there are no irregularities on the interlayer film 20. Absent. Therefore, in the liquid crystal display device 10A of the second embodiment,
The metal film 39 was intermittently formed only in the portions where the distance needs to be calculated.

As shown in FIGS. 7A to 7C, in the liquid crystal display device 10 </ b> A according to the second embodiment, an intermittent portion 39 a is formed in the metal film 39 formed on the interlayer film 20. In this case, at the place where the metal film 39 is formed, the distance H is calculated as in the case of the first embodiment, and the dispenser 36 is calculated.
However, the distance H is not calculated at the intermittent portion 39a of the metal film 39.
The sealing material 33 is applied while maintaining the distance H calculated at the location immediately before 9 is formed. By forming the intermittent portion 39a, the formation of the metal film 39 can be performed in a limited narrow region. Therefore, when the liquid crystal display device 10 is driven, the influence of the electric field generated by the metal film 39 on the liquid crystal molecules is suppressed. be able to.

The metal film 39 can be formed by a photolithography method and an etching method in the same manner as described in the above manufacturing process. Further, the place where the metal film 39 is preferably formed continuously is a place where the distance H of the dispenser 36 needs to be accurately calculated, for example, a corner of the place where the seal material 33 is formed (see FIG. 7B), This is a position (see FIG. 7A) where various wirings cross the application direction of the sealing material 33. Various wiring is sealing material 3
Even if it is formed intermittently at a portion (see FIG. 7C) formed in parallel with the coating direction 3, an error hardly occurs in the control of the distance H of the dispenser 36.

As described above, in the liquid crystal display device 10A according to the second embodiment, there are the portions 39a where the metal film 39 is formed and the portions 39a where the metal film 39 is not formed. it is possible to control the position of the dispenser 36 but with have groups Dzu the distance H between the tip and the metal film 39 of the dispenser 36 as measured at a place where it has been formed. For this reason, according to the liquid crystal display device 10A of the second embodiment, the metal film 39 may be formed in a limited narrow region, and thus the metal film 39 is charged when the liquid crystal display device 10A is driven. The influence of the electric field on the liquid crystal molecules can be suppressed.

[Embodiment 3]
In the liquid crystal display device 10 of the first embodiment, an example in which the metal film 39 as a film made of a light-impermeable material is formed on the interlayer film 20 is shown. However, in the liquid crystal display device 10B of the third embodiment, the metal film 39 is shown.
Is formed between the passivation film 19 and the interlayer film 20 formed on the first transparent substrate 12. The liquid crystal display device 10B according to the third embodiment is the same as the liquid crystal display device 1 according to the first embodiment.
Since only the formation position of the metal film 39 is different from 0, the same components as those of the liquid crystal display device 10 of Embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

In the liquid crystal display device 10B according to the third embodiment, the position where the metal film 39 is formed is the first embodiment.
However, as shown in FIG. 8A, the metal film 39 is formed between the passivation film 19 and the interlayer film 20 stacked on the array substrate 11. Since the surface of the passivation film 19 has at least the unevenness of the metal wirings L such as the gate wiring and the source wiring formed on the first transparent substrate 12, the influence of the unevenness of the various wirings L is small, and the seal It becomes possible to receive the laser beam 41 accurately reflected on the metal film 39 while applying the material 33.

Therefore, since the thickness of the interlayer film 20 is known, the liquid crystal display device 10 according to the third embodiment.
Even in B, the distance H between the tip of the dispenser 36 and the transparent resin film 20 can be accurately calculated, and the position of the dispenser 36 can be accurately controlled.
The sealing material 33 can be accurately applied in a uniform amount. Moreover, since the surface of the metal film 39 is covered with the interlayer film 20, it can be protected from scratches and dirt.

[Embodiment 4]
As the liquid crystal display devices 10, 10 </ b> A, and 10 </ b> B of the first to third embodiments, TN (Twisted
Nematic) mode, VA (Vertical Alignment) mode, MVA (Multi-domain Vertical)
Although the vertical electric field type liquid crystal display device such as the alignment mode has been described, Embodiment 4 shows an example applied to a horizontal electric field type FFS mode liquid crystal display device. Note that in the liquid crystal display device 10C of the fourth embodiment, the same components as those of the liquid crystal display device 10 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the FFS mode liquid crystal display device 10C according to the fourth embodiment, as shown in FIG. 9A, a passivation film 19 and an interlayer film 20 are formed on the array substrate 1, and this interlayer film 20 is formed.
Are formed of a transparent conductive material such as ITO or IZO, a lower electrode 22 made of a transparent conductive material such as ITO or IZO, an inorganic insulating film 23 (also referred to as an interelectrode insulating film) such as silicon nitride, and a transparent conductive material such as ITO or IZO. An upper electrode 24 is formed. The upper electrode 24 has a plurality of slit-shaped openings 25 for each pixel. On the other hand, no electrode is formed on the color filter substrate 26. Although not shown, the lower electrode 22 is electrically connected to the common wiring formed on the first transparent substrate 12, and the upper electrode 24 is electrically connected to the drain electrode of the TFT via a contact hole.

In the liquid crystal display device 10 </ b> C according to the fourth embodiment, the metal film 39 as a film made of a light impermeable material is formed between the interlayer film 20 and the inorganic insulating film 23. The metal film 39 can also be formed by a photolithography method and an etching method. Since the metal film 39 formed in this way is formed on the surface of the interlayer film 20, the surface is flat as described in the liquid crystal display device 10 of the first embodiment.

Therefore, also in the liquid crystal display device 10C according to the fourth embodiment, as shown in FIG. 9B, the sealing material can be accurately and accurately in a uniform amount without being affected by the various metal wirings L formed on the array substrate 11. In addition, since the surface of the metal film 39 is covered with the inorganic insulating film 23, it can be protected from scratches and dirt. In the liquid crystal display device 10C according to the fourth embodiment, an example in which the metal film 39 as a film made of a light-impermeable material is formed between the interlayer film 20 and the inorganic insulating film 23 has been described. Even if it is formed on the surface of 23, the same effect can be obtained.

Furthermore, although the liquid crystal display device provided with the liquid crystal injection port has been described in the first to fourth embodiments, it can be applied to a liquid crystal display device manufactured by a liquid crystal dropping method without providing the liquid crystal injection port.

DESCRIPTION OF SYMBOLS 10, 10A, 10B, 10C ... Liquid crystal display device 11 ... Array substrate 12a ... Extension part
DESCRIPTION OF SYMBOLS 12 ... Transparent substrate 13 ... Scanning line 14 ... Signal line 15 ... Auxiliary capacity line 15a ... Auxiliary capacity electrode 16 ... Semiconductor layer 18 ... Gate insulating film 19 ... Passivation film 20 ... Interlayer film (
(Transparent material layer) 21 ... pixel electrode 22 ... lower electrode 23 ... interelectrode insulating film 24 ... upper electrode 2
5 ... Slit-shaped opening 26 ... Color filter substrate 27 ... Transparent substrate 28 ... Light shielding film
29 ... Color filter 30 ... Overcoat layer 31 ... Common electrode 33 ... Sealing material
34 ... Liquid crystal injection port 36 ... Dispenser 37 ... Laser light generator 38 ... Light receiving device 39a ... Intermittent part 39 ... Metal film 40 ... Laser light 41 ... Reflected light of laser light 42
... Display area 43 ... Frame area (non-display area) CH ... Contact hole Dr ... Driver H ... Distance L ... Various metal wiring LC ... Liquid crystal PA ... Pixel area

Claims (6)

A pair of substrates having at least one transparent material layer formed on opposite surfaces, the periphery of the pair of substrates being bonded together by a sealing material applied to the surface of the transparent material layer, and liquid crystal sealed inside In the liquid crystal display device
The surface or lower surface of the transparent material layer, along the coating pattern of the sealing material, in a position overlapping with the route positioning laser light sheet Lumpur material coating dispenser passes, the light to reflect the laser beam A liquid crystal display device, wherein a film made of an impermeable material is formed.   The liquid crystal display device according to claim 1, wherein the film made of the light-impermeable material is made of metal.   The liquid crystal display device according to claim 1, wherein the film made of the light-impermeable material is formed in a solid shape.   The liquid crystal display device according to claim 1, wherein the film made of the light-impermeable material is formed intermittently.   The liquid crystal display device operates in a fringe field switching mode, and the transparent material layer includes a resin film and an inorganic insulating film formed on the surface of the resin film, and is a film made of the light-impermeable material. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is formed on a surface of the inorganic insulating film or between the inorganic insulating film and the resin film.   (1) A pair of substrates for a liquid crystal display device, wherein a transparent material layer is formed on at least the surface of the pair of substrates facing the other substrate, and the surface of the transparent material layer Alternatively, on the lower surface, a film made of a light-impermeable material is formed at a position overlapping with a path through which a positioning laser beam of a dispenser for applying a sealing material passes along a coating pattern of the sealing material. Preparing a pair of substrates for a display device;
  (2) While irradiating the film made of the light-impermeable material with the positioning laser light of the dispenser for applying the sealing material, the reflected light from the film made of the light-impermeable material is received and Obtaining a distance between the tip position and the transparent material layer, and applying a sealing material while controlling the position of the dispenser so that the distance is constant;
  (3) A method of manufacturing a liquid crystal display device, comprising: a step of bonding the pair of substrates and enclosing a liquid crystal.

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