JP5375628B2 - Liquid crystal display device and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device having a narrower frame and preventing leakage of light in a surrounding portion, in which a UV-curing resin can be cured without fail, in a manufacturing step by an ODF (one-drop-fill) method. <P>SOLUTION: A narrower frame is obtained, by forming a metal wiring line 120 at a position, in a frame portion of a display panel of the display device, the position overlapping an area where a sealing material 190 comprising a UV-curing resin is applied. A BM (black matrix) 160 for preventing leakage of light is formed on a CF-side substrate 150, however, the BM is not formed at an end portion. Consequently, in a manufacturing step, the sealing material 190 can be cured through irradiation with a UV light through the CF side substrate 150. After curing the sealing material 190, a transparent plate 200 constituted of, for example, reinforced glass provided with a decorative frame 210 being laminated, to make the strength of the display panel increase, while preventing leakage of light, at an end of the display panel where the BM 160 is not formed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a liquid crystal display device and a manufacturing method thereof, and more particularly, to a liquid crystal display device manufactured by a One Drop Fill (ODF) method and a manufacturing method thereof.

As one of methods for manufacturing a liquid crystal display device, a method called a One Drop Fill (ODF) method is known. In the ODF method, first, a sealing material made of an ultraviolet (UV) curable resin is applied to the periphery of one of a pair of opposing substrates sandwiching the liquid crystal layer, and the liquid crystal layer is formed. Liquid crystal molecules are dropped on the part to be touched. Thereafter, the pair of substrates are stacked in a vacuum, and then returned to atmospheric pressure to crush the sealing material and liquid crystal molecules, and then the sealing material is cured by UV irradiation. By such curing of the sealing material, the pair of substrates are bonded and the liquid crystal molecules are sealed. A method of manufacturing a liquid crystal display device by the ODF method as described above is disclosed in, for example, Patent Document 1. According to the ODF method, the number of manufacturing steps can be reduced as compared with a conventional manufacturing method in which a space for forming a liquid crystal layer is formed in advance and liquid crystal molecules are injected into the space.

JP-A-8-106101

  There is a demand for a liquid crystal display device to narrow a frame portion, which is a peripheral region that cannot be displayed. For this reason, it is desired to arrange the wirings connected to each pixel at a high density in the frame portion. Further, in order to prevent light leakage from the frame portion, it is required to provide a light shielding portion in the frame portion. Usually, a black matrix having an opening is formed in the pixel portion, and a light shielding portion is formed by forming the entire surface in the frame portion. For these reasons, in the manufacture of the liquid crystal display device by the ODF method, when a seal material made of UV curable resin is applied to the frame portion, the seal material is sufficiently irradiated with UV due to the presence of the wiring and the light shielding portion. There is a problem that the bonding of the pair of substrates and the sealing of the liquid crystal molecules cannot be satisfactorily performed.

  Therefore, the present invention is a liquid crystal display device which has a good display quality without light leakage at the peripheral portion while narrowing the frame, and the peripheral portion of the liquid crystal display device is surely made by UV curable resin in manufacturing using the ODF method. An object of the present invention is to provide a liquid crystal display device that can be bonded and sealed with liquid crystal molecules and a method for manufacturing the same.

In order to achieve the above object, an aspect of the liquid crystal display device of the present invention includes: an observation side substrate; a back side substrate facing the observation side substrate; and a peripheral portion of the observation side substrate and the back side substrate. A sealing material for bonding the observation side substrate and the back side substrate with a certain gap, and a liquid crystal sealed in a space surrounded by the sealing material in the gap between the observation side substrate and the back side substrate A liquid crystal layer composed of molecules, and a conductive line formed on a frame portion that is a peripheral portion that does not display an image of the surface on the liquid crystal layer side of the back surface side substrate, and the conductive line is formed on the back surface It is wired in multiple layers so as to overlap each other via an insulating film on the side substrate, and the sealing material and the conductive wire are arranged on the frame portion at positions where they overlap each other when viewed from the observation side. Light shielding material between the substrate and the sealing material The ultraviolet light irradiated from the side of the observation side substrate reaches the sealing material without the sealing material is a UV-curable resin, the the observation-side substrate, a part of the area except the upper portion of the sealing material and the obstruction is disposed, further observation side before Symbol observation side substrate is disposed a transparent plate, the transparent plate at a position overlapping with the shielding element is not part of the observation side substrate, the light-shielding The member is arranged, It is characterized by the above-mentioned.

Also, to fulfill the above object, one aspect of the manufacturing method of the liquid crystal display device of the present invention, the back surface side substrate, including a first configuration element conductive lines wired in multi-layer through the insulating film forming a back side layer which arranged, shea Lumpur material is applied to a position overlapping with the conductive lines on the back surface side layer, the liquid crystal molecules in the surrounded by the sealant position on the back side layer coated, the observation-side substrate, the second component及beauty solution to form a viewing side layer which arranged spacer that defines the thickness of the crystal layer, the viewing-side layer of the viewing-side substrate including a light shielding material The surface on which the liquid crystal molecules are applied on the back side substrate and the surface on which the liquid crystal molecules are applied are superposed in a vacuum so that the light shielding material is disposed in a part of the area excluding the upper part of the sealing material, by irradiating the observation side substrate side or Murasaki Luo light under curing the sealing material, the outlook Further observation side of the side board, the light shielding member to the shader overlaps with no portion position of the observation side substrate is disposed, to place the transparent plate, characterized in that.

  According to the present invention, it is a liquid crystal display device that has a narrow frame and does not leak light at the peripheral portion and has a good display quality. In the manufacturing using the ODF method, the liquid crystal display device is surely made by a UV curable resin. A liquid crystal display device capable of adhering at the peripheral edge and sealing liquid crystal molecules and a method for manufacturing the same can be provided.

1 is a plan view for explaining an outline of a display panel of a liquid crystal display device according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating an example of a peripheral portion of the display panel of the liquid crystal display device according to the first embodiment of the present invention. Sectional drawing which shows another example of the peripheral part of the display panel of the liquid crystal display device which concerns on the 1st Embodiment of this invention. The figure for demonstrating an example of the manufacturing process of the display panel of the liquid crystal display device which concerns on the 1st Embodiment of this invention. FIG. 4 is a view for explaining an example of a manufacturing process after FIG. 3A of the display panel of the liquid crystal display device according to the first embodiment of the present invention. The figure for demonstrating another example of the manufacturing process of the display panel of the liquid crystal display device which concerns on the 1st Embodiment of this invention. Sectional drawing which shows an example of the peripheral part of the display panel of the liquid crystal display device which concerns on the 2nd Embodiment of this invention. The figure for demonstrating an example of the manufacturing process of the display panel of the liquid crystal display device which concerns on the 2nd Embodiment of this invention.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the liquid crystal display device according to the present embodiment, the display panel that changes light transmission for each pixel in order to perform image display mainly includes a thin film transistor (TFT) formed thereon, for example, glass. A TFT side substrate, a color filter (CF) formed thereon, a CF side substrate made of glass or the like, and a liquid crystal layer sandwiched between the TFT side substrate and the CF side substrate are formed. The periphery of the TFT side substrate and the CF side substrate is bonded with a sealing material, and the sealing material prevents the liquid crystal molecules constituting the liquid crystal layer from leaking from between the TFT side substrate and the CF side substrate. It is sealed. Further, a transparent plate made of, for example, tempered glass is bonded to the CF side substrate side in order to increase the strength of the entire display panel.

  FIG. 1 shows a schematic plan view of the display panel of the liquid crystal display device according to this embodiment. On the TFT side substrate, there are formed a pixel electrode 111, a TFT 112 serving as a switching element of the pixel electrode 111, and a scanning line 113 and a signal line 114 which are connected to the TFT 112 and wired so as to intersect each other. . In addition, wirings such as the scanning lines 113 and the signal lines 114 are routed by metal wirings at the peripheral edge of the display panel. On the CF side substrate, a common electrode, a color filter, a black matrix (BM), etc. (not shown) are formed. The transparent plate is provided with a decorative frame 210 to prevent unnecessary light leakage at the peripheral edge of the display panel.

  FIG. 2 shows a cross section of the AA portion in FIG. 1 which is the peripheral portion of the display panel. On the TFT side substrate 110, a metal wiring 120 connected to the scanning line 113, the signal line 114, and the like and around them is formed together with an insulating film 130. Further thereon, an alignment film 140 subjected to a rubbing process is formed. Since the display panel is a high-definition panel, the number of wirings is large, and the metal wiring 120 is assumed to be wired in two layers as shown in FIG. Note that the wiring is not limited to two layers, and a multilayer wiring of three or more layers may be used in order to narrow the frame.

  On the other hand, a black matrix (BM) 160 for preventing light leakage is patterned on the CF side substrate 150 up to the peripheral edge of the display panel. However, as shown in FIG. 2, the BM 160 is not formed up to the end of the peripheral portion of the display panel, that is, the portion where the metal wiring 120 is wired. On the BM 160, an alignment film 180 subjected to a rubbing process is formed.

  In the portion including the edge of the peripheral portion between the TFT side substrate 110 and the CF side substrate 150, the portion where the metal wiring 120 of the TFT side substrate 110 is formed and the portion where the BM 160 of the CF side substrate 150 is not formed A seal material 190 made of an ultraviolet (UV) curable resin is applied to a position where the two overlap each other. The TFT side substrate 110 and the CF side substrate 150 are bonded to each other with a certain gap by curing the sealing material 190 by UV irradiation. Here, the interval between the alignment film 140 and the alignment film 180 is defined by the diameter of the spherical scattering spacer 230, for example. The scattering spacer 230 is not limited to a spherical shape, and may be a cylindrical shape, for example. Liquid crystal molecules are sealed in a gap formed between the alignment film 140 and the alignment film 180 to form a liquid crystal layer 220. The liquid crystal molecules forming the liquid crystal layer 220 are sealed in the gap by a sealing material 190.

The opposite side of the liquid crystal layer 220 side of the TFT-side substrate 110 and the CF-side substrate 150, a polarizing plate and other optical films (not shown) is bonded. Further, a transparent plate 200 made of, for example, tempered glass and the like having a decorative frame 210 is bonded to the opposite side of the surface of the CF side substrate 150 on the liquid crystal layer 220 side. The decorative frame 210 is formed from the peripheral edge of the display panel to a position overlapping the BM 160 and does not transmit light.

In the display panel of the liquid crystal display device according to the present embodiment having the above-described configuration, each pixel line 111 is applied to each pixel electrode 111 by appropriately applying a voltage to each scanning line 113 and each signal line 114 via the metal wiring 120. A voltage can be applied. An electric field is formed in the liquid crystal layer 220 of each pixel by the voltage applied to each pixel electrode 111. This electric field causes the liquid crystal layer 220 for each pixel to function as an optical switch and display an image as the entire display panel.

  Here, the sealing material 190 plays a role of bonding the TFT side substrate 110 and the CF side substrate 150 together. Further, the sealing material 190 also serves to seal the liquid crystal of the liquid crystal layer 220 together with the TFT side substrate 110 and the CF side substrate 150. Further, the BM 160 and the decorative frame 210 serve as a light shielding unit for preventing a user who observes unnecessary light due to light leakage from the CF side substrate 150 side. Further, the transparent plate 200 has a function of increasing the strength of the entire display panel.

  Even if the decorative frame 210 is not provided, since the metal wiring 120 is wired in two layers, a part of the light of the backlight (not shown) arranged on the TFT side substrate 110 side is blocked by the metal wiring 120. It is done. However, in order to reliably block unnecessary light, the display panel needs to include a decorative frame 210.

  Thus, for example, the CF side substrate 150 functions as an observation side substrate, for example, the TFT side substrate 110 functions as a back side substrate, and for example, the sealing material 190 has a peripheral portion between the observation side substrate and the back side substrate. It functions as a sealing material for bonding the observation side substrate and the back side substrate with a certain gap, and for example, the liquid crystal layer 220 is sealed in a space surrounded by the sealing material in the gap between the observation side substrate and the back side substrate. It functions as a stopped liquid crystal layer, for example, the metal wiring 120 functions as a conductive line formed in the frame portion, and the decorative frame 210, for example, overlaps a portion where there is no light shielding material between the observation side substrate and the sealing material. It functions as a light-shielding member that is positioned further on the observation side of the observation-side substrate.

  In addition, the spacer which prescribes | regulates the thickness of the liquid crystal layer of the display panel demonstrated with reference to FIG. However, the present invention is not limited to this, and the spacer that defines the thickness of the liquid crystal layer may be, for example, a column spacer 240 as shown in FIG. For example, the column spacer 240 is formed between the common electrode on the color filter (CF) and the alignment film 180 at a position overlapping the position where the BM 160 is formed as viewed from the observation side. In the case where the column spacer 240 is formed, the alignment film 140 and the alignment film 180 are in contact with each other at the portion where the column spacer 240 is disposed, and the thickness of the liquid crystal layer 220 depends on the height of the column spacer 240. It is prescribed.

  Next, a method for manufacturing a display panel having the configuration described with reference to FIG. 2 will be described with reference to FIGS. 4A and 4B. The manufacturing method is a manufacturing method called an One Drop Fill (ODF) method.

  A TFT layer 125 including the pixel electrode 111, the TFT 112, the scanning line 113, the signal line 114, the metal wiring 120, the insulating film 130, and the like is formed on the TFT side substrate 110 in the step shown in FIG. 4A. To do. Subsequently, in the step shown in FIG. 4A (b), a film made of polyimide, for example, is formed, and a rubbing process is performed to form an alignment film 140.

Thus, for example, TFT layer 125 and an alignment film 140 functions as a back side layer which is a first component that is sandwiched between the rear substrate and the liquid crystal layer.

  Next, in the step shown in FIG. 4A (c), the sealing material 190 made of the UV curable resin is applied to the adhesion and sealing portion of the peripheral portion of the display panel on the alignment film 140. Next, in the step shown in FIG. 4A (d), liquid crystal molecules 225 are dropped on the portion of the alignment film 140 where the liquid crystal layer 220 is to be formed.

  On the other hand, on the CF side substrate 150, a CF layer 165 including the BM 160, the CF, the common electrode, and the like is formed in the step shown in FIG. 4A (e). Subsequently, in the step shown in FIG. 4A (f), a film made of, for example, polyimide is formed, and a rubbing process is performed to form an alignment film 180. Next, in the step shown in FIG. 4A (g), first, a dispersion spacer 230 is dispersed on the alignment film 180. Here, the scattering spacer 230 has, for example, a spherical shape, and the diameter thereof is equal to the thickness of the liquid crystal layer 220 and has a function of defining the thickness of the liquid crystal layer. Subsequently, the CF-side substrate 150 on which the spreading spacers 230 are spread is heated to fix the spreading spacers 230.

In this way, for example, the CF layer 165, the alignment film 180, and the scattering spacer 230 are the observation side layer in which the second component sandwiched between the observation side substrate and the liquid crystal layer and the spacer that defines the thickness of the liquid crystal layer are arranged. Function as.

Subsequently, in the step shown in FIG. 4B (h), the surface of the TFT-side substrate 110 on which the sealing material 190 and the liquid crystal molecules 225 are applied and the surface of the CF-side substrate 150 on which the dispersion spacers 230 are dispersed are formed in a vacuum. Overlapping. Next, in the step shown in FIG. 4B (i), the pressure is returned to atmospheric pressure, and the sealing material 190 and the liquid crystal molecules 225 are crushed to the height of the scattering spacer 230. In this way, the thickness of the sealing material 190 and the liquid crystal layer 220 is defined by the height of the scattering spacer 230. Then, under atmospheric pressure, the sealing material 190 is cured by irradiating UV from the CF side substrate 150 side. Furthermore, it allows complete cure of the sealing material 190 and then fired.

Then cut for each display panel, on the TFT side substrate 110 and the CF-side substrate 150, a polarizing plate is attached to and other optical films (not shown), in the step shown in FIG. 4B (j), the CF-side substrate 150 side A transparent panel 200 made of, for example, tempered glass with a decorative frame 210 is bonded to the outermost surface to complete the display panel.

  The above manufacturing method of the display panel is a case where the scattering spacer 230 is used for the spacer shown in FIG. 2, but the manufacturing method of the display panel using the column spacer 240 described with reference to FIG. In 4A, (f) and (g) are different. That is, as shown in FIG. 5, the column spacer 240 is formed on the CF layer 165 in the step shown in FIG. Subsequently, in a step shown in FIG. 5G, a film made of polyimide, for example, is formed so as to cover the column spacer 240, and a rubbing process is performed to form an alignment film 180. Thereafter, in the same manner as described with reference to FIG. 4B, in the step shown in (h), the TFT side substrate 110 coated with the sealing material 190 and the liquid crystal molecules 225, the column spacer 240, and the alignment film 180 were formed. The CF side substrate 150 is superposed in a vacuum, and thereafter the same process is performed.

Thus, for example, the CF layer 165, the alignment film 180, and the column spacer 240 are the second constituent element sandwiched between the observation side substrate and the liquid crystal layer, and the observation side layer in which the spacer that defines the thickness of the liquid crystal layer is arranged. Function as.

  The following effects can be obtained by manufacturing the display panel having the above-described configuration through the manufacturing process as described above. That is, the frame portion that does not display an image can be narrowed by wiring the metal wiring 120 at a position overlapping the bonding portion of the peripheral portion of the display panel by the sealing material 190. In this case, the frame can be further narrowed by forming the metal wiring 120 as a multilayer wiring such as two layers.

  In the manufacturing process using the ODF method, UV irradiation for curing the sealing material 190 is performed when the bonding portion by the sealing material 190 made of the UV curable resin and the wiring portion of the metal wiring 120 overlap each other as described above. Cannot be performed from the TFT side substrate 110 side. This is because the display panel is high-definition and therefore has a large number of metal wirings 120 and they are wired at a high density. Therefore, the metal wiring 120 blocks UV that is irradiated from the TFT side substrate 110 side. This is to prevent the sealing material 190 from reaching. This becomes more prominent when the metal wiring 120 is a multilayer wiring. Therefore, in the production of the display panel of the liquid crystal display device according to this embodiment, UV irradiation for curing the sealing material 190 is performed from the CF side substrate 150 side. For this reason, BM160 is not formed in the position which overlaps with the sealing material 190. FIG. Since there is mainly a transparent member between the CF side substrate 150 and the sealing material 190, the sealing material 190 can be sufficiently irradiated with UV from the CF side substrate 150 side, and the sealing material 190 is reliably cured. be able to. Therefore, the TFT side substrate 110 and the CF side substrate 150 can be securely bonded and the liquid crystal molecules 225 can be sealed.

  When UV irradiation for curing the sealing material 190 is performed from the CF side substrate 150 side, UV irradiation reflected light from the metal wiring 120 can also be used. This utilization is more effective when the metal wiring 120 is a multilayer wiring and a seal region is included on the metal wiring region. By using this, the sealing material 190 can be hardened more reliably.

For the above reason, the BM 160 is not formed at a position overlapping the sealing material 190. For this reason, the light from the backlight disposed on the TFT side substrate 110 side is partially blocked by the metal wiring 120, but at the peripheral edge of the display panel where the sealing material 190 is located, There is a risk that the user who observes the camera will observe unnecessary light due to light leakage. Therefore, in the display panel of the liquid crystal display device according to the present embodiment, the decorative frame 210 is arranged from the end of the display panel to a position overlapping with the BM 160 in order to prevent the user from observing unnecessary light due to light leakage. .

  As described above, according to the present embodiment, it is possible to provide a liquid crystal display device having a good display quality without light leakage at the peripheral edge while achieving a narrow frame. In addition, in the production of the liquid crystal display device using the ODF method, a production method capable of reliably performing adhesion and sealing of liquid crystal molecules at the peripheral portion of the liquid crystal display device with a UV curable resin can be provided.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. Here, in the description of the second embodiment, differences from the first embodiment will be described, the same portions as those in the first embodiment will be denoted by the same reference numerals, and the description thereof will be omitted.

  FIG. 6 is a cross-sectional view of the peripheral portion of the display panel of the liquid crystal display device according to the present embodiment, corresponding to FIG. 2 according to the first embodiment. In the present embodiment, there are mainly two points that are different from the case of the first embodiment. The first point is that a transparent wiring 320 made of a transparent conductor such as indium tin oxide (ITO) is used instead of the metal wiring 120 according to the first embodiment. As in the case of the first embodiment, the transparent wiring 320 is designed to narrow the frame of the present display panel by wiring in multiple layers such as two layers. The second point is that the BM 160 that was not formed at the position where the sealing material 190 is arranged in the first embodiment is formed up to the end of the display panel in the present embodiment. In addition, the spacer which prescribes | regulates the thickness of the liquid crystal layer 220 may use the dispersion | distribution spacer 230 or the column spacer 240 similarly to that of 1st Embodiment.

  Although not shown in FIG. 4, as in the case of the first embodiment, tempered glass, for example, is used to increase the strength of the entire display panel on the side opposite to the liquid crystal layer 220 side surface of the CF side substrate 150. A transparent plate 200 made of or the like may be attached. In this case, the decorative frame 210 may be omitted.

  The manufacturing method of the display panel according to this embodiment is also substantially the same as that of the first embodiment, and the difference is the process described with reference to (i) in FIG. 4B. That is, this embodiment is different from the first embodiment in that UV irradiation is performed from the TFT side substrate 110 side as shown in FIG. This difference is that, in this embodiment, the BM 160 is formed up to the end of the display panel, so that even if UV is irradiated from the CF side substrate 150 side, the UV is blocked by the BM 160 and does not reach the sealing material 190. Because of that. Even if UV is irradiated from the CF side substrate 150 side, the UV does not reach the sealing material 190, but the transparent wiring 320 is transparent. Therefore, if UV is irradiated from the TFT side substrate 110 side, the UV reaches the sealing material 190. . Therefore, as shown in FIG. 7, in this embodiment, UV irradiation is performed from the TFT side substrate 110 side.

  By manufacturing the display panel having the above-described configuration through the manufacturing process as described above, the following effects can be obtained as in the case of the first embodiment. That is, the frame portion that does not display an image can be narrowed by wiring the transparent wiring 320 at a position that overlaps the bonding portion of the peripheral portion of the display panel by the sealing material 190. At this time, the transparent wiring 320 can be a multilayer wiring so that the frame can be further narrowed.

  In addition, by using a transparent conductor for the transparent wiring 320 in the manufacturing process by the ODF method, UV is sufficiently applied to the sealing material 190 even when UV irradiation for curing the sealing material 190 is performed from the TFT side substrate 110 side. Can be reached. For this reason, the sealing material 190 can be reliably cured, the TFT side substrate 110 and the CF side substrate 150 can be bonded, and the liquid crystal molecules 225 can be sealed.

  As described above, since UV irradiation for curing the sealing material 190 can be performed from the TFT side substrate 110 side, unlike the case of the first embodiment, the BM 160 can be disposed up to the end of the display panel. For this reason, light shielding for preventing the user from observing unnecessary light due to light leakage can be sufficiently performed at the peripheral edge of the display panel.

  As described above, according to the present embodiment, it is possible to provide a liquid crystal display device having a good display quality without light leakage at the peripheral edge while achieving a narrow frame. In addition, in the production of the liquid crystal display device using the ODF method, a production method capable of reliably performing adhesion and sealing of liquid crystal molecules at the peripheral portion of the liquid crystal display device with a UV curable resin can be provided.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem described in the column of problems to be solved by the invention can be solved and the effect of the invention can be obtained. The configuration in which this component is deleted can also be extracted as an invention. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 110 ... TFT side substrate, 111 ... Pixel electrode, 112 ... TFT, 113 ... Scanning line, 114 ... Signal line, 120 ... Metal wiring, 125 ... TFT layer, 130 ... Insulating film, 140 ... Alignment film, 150 ... CF side substrate , 160 ... BM, 165 ... CF layer, 180 ... alignment film, 190 ... sealing material, 200 ... transparent plate, 210 ... decorative frame, 220 ... liquid crystal layer, 225 ... liquid crystal molecule, 230 ... dispersion spacer, 240 ... column spacer, 320: Transparent wiring.

Claims (8)

An observation side substrate;
A back side substrate facing the observation side substrate;
A sealing material for bonding the observation side substrate and the back side substrate with a certain gap at the periphery of the observation side substrate and the back side substrate;
A liquid crystal layer composed of liquid crystal molecules sealed in a space surrounded by the sealing material in the gap between the observation side substrate and the back side substrate;
Conductive lines formed on a frame portion that is a peripheral portion that does not display an image of the surface on the liquid crystal layer side of the back side substrate;
Comprising
The conductive lines are wired in multiple layers on the back side substrate so as to overlap each other via an insulating film,
In the frame portion, the sealing material and the conductive wire are arranged at a position where they overlap when viewed from the observation side,
UV light irradiated from the side of the observation side substrate without the light shielding material between the observation side substrate and the sealing material reaches the sealing material,
The sealing material is an ultraviolet curable resin,
In the observation side substrate, a light blocking object is disposed in a part of the area excluding the upper part of the sealing material,
Further observation side before Symbol observation side substrate is disposed a transparent plate,
A light-shielding member is disposed at a position of the transparent plate that overlaps the portion of the observation-side substrate where there is no light-shielding object.
A liquid crystal display device characterized by the above.   2. The liquid crystal display device according to claim 1, wherein the conductive lines wired in multiple layers on the back side substrate so as to overlap each other via the insulating film are metal wirings. A spacer for defining the thickness of the liquid crystal layer is further provided between the observation side substrate and the back side substrate,
The liquid crystal display device according to claim 1, wherein the spacer is a scattering spacer having a height equal to a thickness of the liquid crystal layer. A spacer for defining the thickness of the liquid crystal layer is further provided between the observation side substrate and the back side substrate,
The liquid crystal display device according to claim 1, wherein the spacer is a column spacer having a height equal to a thickness of the liquid crystal layer. On the back side substrate, a back side layer in which a first component including conductive lines wired in multiple layers via an insulating film is disposed,
Apply a sealing material at a position overlapping the conductive line on the back side layer,
Applying liquid crystal molecules to a position surrounded by the sealing material on the back side layer,
On the observation-side substrate, a second component including a light blocking object and an observation-side layer in which a spacer that defines the thickness of the liquid crystal layer is arranged are formed.
The light-shielding object is arranged in a part of the surface of the observation side substrate except the upper part of the sealing material between the surface on which the observation side layer is formed and the surface of the back side substrate on which the liquid crystal molecules are applied. In a vacuum,
Irradiate ultraviolet light from the observation side substrate side under atmospheric pressure to cure the sealing material,
Further, on the observation side of the observation side substrate, a light shielding member is arranged at a position overlapping with a portion of the observation side substrate where there is no light shielding material, a transparent plate is disposed,
A method for manufacturing a liquid crystal display device. The conductive lines wired in multiple layers on the back side substrate via the insulating film are metal wirings,
The method for manufacturing a liquid crystal display device according to claim 5, wherein the sealing material is cured by using a part of the ultraviolet light irradiated from the side of the observation side substrate as reflected light from the metal wiring. The spacer is a scattering spacer having a height equal to the thickness of the liquid crystal layer,
The formation of the observation side layer is as follows:
Forming a base observation side layer as the second component on the observation side substrate;
Apply and fix the scattering spacer on the base observation side layer,
Including steps,
A method for manufacturing a liquid crystal display device according to claim 5 or 6.   The method of manufacturing a liquid crystal display device according to claim 5, wherein the spacer is a column spacer having a height equal to a thickness of the liquid crystal layer.

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