TW589498B - Structure of liquid crystal display - Google Patents

Abstract

In conventional arts, a liquid crystal display with one drop fill (ODF) has a problem that the liquid is contaminated by an uncured sealant resulted from UV light being blocked by a black matrix, a conducting layer, etc from irradiating the sealant. In this present invention, a material of the array is replaced with a transparent material at least in a portion of an area sealant located, where the portion of area is the border between the liquid crystal and the sealant. Therefore, the sealant contacting with the liquid is completely cured by UV light without the blocking of the black matrix or the conducting layer.

Description

589498 V. Description of the invention (1) | 1. [Technical field to which the invention belongs] The present invention relates to the structure of the periphery of a liquid crystal display panel, particularly to a liquid crystal panel formed by a liquid crystal drip filling method, which is in contact with the liquid crystal. The conductive film in the area where the frame glue h is located is made of transparent material, so that the frame glue can receive ultraviolet light, "radiation hardening. |-I 2. [Previous technology] Because the optical axis of the liquid crystal is consistent with its molecular axis, plus the liquid crystal material It has the characteristics of flow, so it can make the liquid crystal molecules to form different alignment conditions with very small force. Taking the most common and common nematic type liquid crystal as an example, it can cause the liquid crystal by the action of an electric field. Molecular turn. When the polarized light emitted by the backlight (back 1 i ght) module and passed through the polarizer passes through the liquid crystal, its polarization direction will change following the alignment of the liquid crystal molecules. With another polarizer, It can produce different transmittances for polarized light with different polarization directions. It can be seen that the liquid crystal display mainly uses two polarizing plates. Among the liquid crystals, for each liquid crystal region to display different brightness expressions, different regions with different electric fields corresponding to the brightness 'make the liquid crystal generate different liquid crystal directions'. Different regions can display different brightness performances according to the graphics to be displayed. The red, blue and green φ (RGB) three primary color color filters (color fi Iter) are used to display the red, blue and green three-color areas of the display unit to give different brightness, and these three colors can be mixed to show different Color so that the LCD can display color l

Page 6 589498 V. Description of the invention (2) Color, even full-color image. Since the liquid crystal material has a fluidity relationship, the liquid crystal must be injected into two glass substrates (glass substrates) bonded by a frame adhesive to be fixed. The glass substrate is provided with transistors, electrodes, and the like to provide an electric field to change the alignment direction of the liquid crystal. The two polarizing plates mentioned above are also placed on the two glass substrates. In the previous technology of injecting (i n j e c t i ο η) liquid crystal, most of them used the vacuum injecting liquid crystal process: first, the two glass substrates were combined, and then placed in a vacuum sealed box. The two glass substrates that have been assembled will have an opening. The liquid crystal is provided by the sponge below the opening. The combined two glass substrates are in a vacuum state. When the air is released into the box, the internal and external pressure of the glass substrate will be generated. Poorly injected liquid crystal from the opening. After the liquid crystal is completely injected into the liquid crystal panel, the opening is sealed to complete the liquid crystal filling operation. However, the main disadvantage of this vacuum / main-into-liquid crystal process is that the liquid crystal injection time is extremely long, and the liquid crystal injection time will increase with the increase of the size of the liquid crystal panel and the reduction of the cell gap of the panel. In terms of the trend of size liquid crystals, this vacuum liquid crystal injection method will not only fail to reduce the time cost of the manufacturing process, but also increase with the increase in panel size. The new widely used One-Drop Fill (ODF) technology has shortened the liquid crystal injection process time. The device is used to control the amount of liquid crystal dripping. The technology is liquid crystal drip filling. The liquid crystal drip filling technology is effective. The liquid crystal drip filling technology uses a drop to directly drop an appropriate amount of liquid crystal on the glass.

Page 7 589498 V. Description of the invention (3) The glass substrate is then assembled (assemb 1 y), and the process of ultraviolet radiation hardening is reduced (Cell Process) 〇Injection of liquid crystal crystals can reduce The process time required for sealing is generally several days of process time required for the liquid crystal. After the combination is completed in a vacuum with another field-breaking substrate, the frame glue is pressed. In addition to simplifying the process steps, the process technology is used to perform the liquid operation. Within a few hours, compared with vacuum injection, the process time cost is greatly reduced.

Although the liquid crystal drip filling technology has the advantages described above, because the sequence of steps in the process is that before the liquid crystal is directly dripped onto the glass substrate, a sealant material with a high viscosity must be coated on the glass substrate. '), To be used as the adhesive for limiting liquid crystals and as a liquid crystal panel assembly, after the panel assembly is completed, the frame adhesive must be irradiated with ultraviolet rays to harden the frame adhesive. As shown in the first figure, a general liquid crystal panel 100 has two glass substrates of a color filter glass substrate 100 and a thin film transistor glass substrate 120, and a color filter glass substrate 100 has a color filter. The light film (not shown) and the black matrix structure (black matrix) 140, and the thin film transistor glass substrate 120 has a thin film transistor (not shown), a conductive film 200 (conducting layer) and other structures. The black matrix 1 40 on the color filter glass substrate 100 is opaque material, and the thin film transistor glass substrate 1 20 has opaque structures such as a conductive film 20 0, which will block ultraviolet rays, so Regardless of whether the frame adhesive 1 6 0 is irradiated with ultraviolet light 300 from the color filter glass substrate 100 end or the thin film transistor glass substrate 1 20 0 end, there will be a frame adhesive 1 6 0 Case of incomplete hardening. When the liquid crystal 2 2 0 and the uncured frame adhesive

Page 8 589498 V. Description of the invention (4) The contact with 160 will cause the epoxy resin (EροX y R esi η) molecules or monomers in the frame rubber 160 to diffuse into the liquid crystal 22O, which in turn makes The liquid crystal 22 0 ′ is contaminated, so that the liquid crystal 2 2 0 is driven abnormally and a defect is generated. In order to solve the problem of incomplete hardening of the frame rubber, the problems of incomplete curing of the frame rubber by using side-illumination or floor reflection techniques have been developed. However, in addition to these processing technologies, the complexity of the hardening process will be increased.丨 Increase the risk of the liquid crystal from ultraviolet rays. The liquid crystals exposed to ultraviolet rays will have problems of cracking or degradation resistance. In addition to causing defects in the upward alignment of the liquid crystals and making the image quality of the LCD panel (Image | QUality) worse, it will also produce ~ Attenuation of voltage retention of raw liquid crystals | degradation of v〇ltage retenti〇n) I (f 1 icker) and other phenomena ~ wind gates. Therefore, in the conventional art, the problem caused by the curing The filling filling dare j # 士 ~%, Α = I 1 UV treatment by Wang Zhong has not yet been effectively processed and resolved. Contents】 I. In view of the above-mentioned invention, a liquid crystal panel will be used to cure the frame glue incompletely or cause the liquid crystal quality to be degraded. Although the hardening scene is solved, the conventional technique uses liquid to black In the process of matrix or conductive film, it is exposed to ultraviolet light when receiving ultraviolet light. However, the problem of oblique ultraviolet rays is incomplete, but the formation of crystal drops and filling methods, such as structural insufficiency, can cause hardening and liquid crystal cracking due to incomplete radiation. The method of hardening the frame to form more liquid crystals is subject to 589498. 5. Description of the invention (5 ^ ~ 一 " 一 ---- Irradiation causes more degradation of the liquid crystal. The main glue of the present invention is the liquid crystal surface of the coated frame adhesive area, and the frame that will contact the liquid crystal is clear. The material of the conductive film of the thin film transistor glass substrate of the μ field, when the frame adhesive is used, it is not possible to illuminate the frame adhesive from the end of the thin film crystal glass substrate. Contact dyeing: Where the king is hardened, and the liquid crystal is not contaminated by the incompletely hardened frame glue :: The frame glue is hardened. The light can be perpendicular to the glass substrate to illuminate the quality. Glue to reduce the liquid crystal from being illuminated Opportunity of bismuth, to ensure the quality of the liquid crystal IS: the hardening light of the frame glue can be perpendicular to the glass substrate to shine, 'π: f / hardening process is easier than the conventional hardening technology, so that liquid sa drop Luo filling Process conditions It is more relaxed. Ίί: ΐ 所 Lt 目 #, the present invention provides a liquid crystal display panel. It is a conductive film of a B-type glass substrate, which uses a film of a region where a frame adhesive in contact with the liquid crystal is located. The material is replaced by a transparent material, so that when the light is irradiated from the end of the thin film transistor glass substrate to the frame adhesive, it will not be blocked by the opaque conductive film to ensure that the frame adhesive that is in contact with the liquid crystal can be completely hardened, and the liquid crystal is not completely incomplete. The hardened frame adhesive is contaminated. The present invention discloses a structure around a liquid crystal display panel, including a first glass substrate, a glass substrate, and a frame adhesive. The surface of the first glass substrate has a black moment

1 1111 Page 10 589498 V. Description of Invention (6) Array. One surface of the second glass substrate has a thin film transistor. The sealant is applied between the first glass substrate and the second glass substrate 'to connect the first glass substrate and the second glass substrate. The surface where the first slope substrate is connected to the frame adhesive includes an inner portion near the display region of the liquid crystal display panel, and the inner portion includes a first insulating layer and a first conductive film. The first conductive film is formed on the first insulating layer, and the material of the first conductive film is a transparent material. The present invention also discloses a structure around a liquid crystal display panel including a first glass substrate, a second glass substrate, and a frame adhesive. One surface of the first glass substrate has a black matrix. The second glass substrate has a thin film electro-crystal on its surface. The sealant is applied between the first glass substrate and the second glass substrate to connect the first glass substrate and the second glass substrate. The area between the innermost surface of the second glass substrate and the frame adhesive to the edge of the liquid crystal display panel includes a first insulating layer and a first conductive film. The first conductive film is formed on the first insulating layer, and the material of the first conductive film is a transparent material. Therefore, compared with the conventional technology, the frame rubber is not completely hardened, or the side frame or the bottom plate reflection method is used to increase the complexity of the frame rubber hardening process and increase the area where the liquid crystal is exposed to ultraviolet rays. The structure of the periphery of the liquid crystal display panel disclosed in the present invention allows the conductive film of the thin film transistor glass substrate in the area where the sealant is applied to the liquid crystal panel to contact the liquid crystal. 2 The conductive film of the glass substrate is replaced by a transparent material. So light is made of thin film transistor glass

Page 11 589498 V. Description of the invention (7) When the substrate is irradiated with the frame adhesive, it will not be covered by the opaque conductive film to ensure that the frame adhesive that is in contact with the liquid crystal can be completely cured, and avoid the liquid crystal being incompletely cured. Polluted. The curing light of the frame adhesive can be perpendicular to the glass substrate to illuminate the frame adhesive 'to reduce the chance of the liquid crystal being irradiated by the light and ensure the quality of the liquid crystal. The frame curing light can be irradiated perpendicular to the glass substrate to illuminate the frame curing. In this way, the frame curing process is easier than the conventional curing technique, and the process conditions for liquid crystal dropping and filling are also more relaxed. 4. Embodiments a. Some embodiments of the invention will be described in detail as follows. However, in addition to the detailed description, the present invention can also be widely implemented in other embodiments, and the scope of the present invention is not limited, which is subject to the scope of subsequent patents. In order to provide a clearer description and easier understanding of the present invention, the drawings are not according to their relative dimensions. Some dimensions and their ratios have been exaggerated; irrelevant details have not been completely concise, ®® ''

^ In the know-how, the liquid crystal drip filling technology (〇DF) is injected into the surface of the substrate, and the surface is reversed. During the curing process of the sealant, the liquid crystal panel 'ii:? Opaque structure (for example: black matrix, conductive Film, etc.) or other frames, the light rays irradiate the frame glue, so the curing is not complete. The incompletely hardened sealant is in contact with the liquid crystal, two:

Page 12 589498 5. Description of the invention (8) The liquid crystal is not driven properly due to pollution. The spirit of the present invention is to at least make the sealant in contact with the liquid crystal reach a completely hardened state, which can avoid the problem of abnormal driving of the liquid crystal due to pollution in the conventional technology. Therefore, the conductive film under the frame adhesive that is in contact with the liquid crystal (that is, the frame adhesive near the inner portion of the display area) must be transparent, so that the frame adhesive on the inner portion can be fully hardened by receiving sufficient hardening light. In this way, by changing the material of the conductive film under the frame sealant on the inner part to a light-transmitting material, the frame seal that completely contacts the liquid crystal can be achieved and the problem of abnormal driving of the liquid crystal due to pollution can be avoided.

The second diagram A is a preferred embodiment of the present invention. The liquid crystal panel includes two color filter glass substrates 100 and a thin film transistor glass substrate 12 two glass substrates. The color light filter glass substrate 100 includes a color filter and a black matrix 14. The black matrix 1 40 on the color filter glass substrate 100 is an opaque material. The color tear film glass substrate 100 and the thin-film transistor glass substrate 12 are connected to each other with a frame adhesive 160. The thin-film transistor glass substrate 12 has an insulating layer 18 q and conductive films 2000, 202, 204, 206, and 208. Among them, the conductive film is 2000, 208

The preferred material is a multi-layer metal structure with Shaoxing or an aluminum alloy. Guides 202, 2 04, and 2006 are conductive materials made of transparent materials, and a better material is Indium Tin Oxide (ITO). In order to make the inner side of the frame adhesive completely hardenable, the inner starting position of the conductive film 206 is closer to the display area than the frame adhesive 160, that is, the area where the second person picture ^ 220 is located. And the conductive film next to the conductive film 206 · The starting position of the conductive film is from the innermost conductive film of the area where the frame adhesive 1 60 is located (as shown in the picture of $). This can reduce the hardened light of the liquid crystal (especially Is UVA)

Page 13 589498 V. Description of the invention (9) '^ --- = body ^ = opportunity to maintain the quality of the liquid crystal. The outermost position of the conductive film 2 04 (near the edge of the glass substrate) may be selected within Λ frame rubber 160 (as shown in the second A picture) or outside the frame rubber 160 according to panel conductivity or other aspects. Alternatively, the second portion of the conductive film 200 may be replaced by the transparent conductive film 204 which is all == transparent. That is, the conductive films from the inner starting position of the conductive film 204 to the edge of the glass substrate are all transparent and are formed on the insulating layer 180. If the selected transparent conductive film 20, 2 and 4 are used, if the part formed outside (outside) the frame rubber 1 60 is suspected of being oxidized or eroded by moisture, etc., you can choose to form it only. Within the range of 160, two or more than the frame rubber 60 range, a part of the barrier layer sufficient to prevent oxidation and erosion of water vapor and the like is formed. When the frame adhesive hardens light 32 ° and irradiates the frame adhesive} 60 from the 20th end of the thin film glass substrate 1, the inside portion of the frame adhesive i 6〇 will not be blocked by the opaque structure. Therefore, the frame adhesive i 6〇 The inner part ^ can be fully cured at 70 to prevent the liquid crystal 2 2 0 from being contaminated by the uncured frame adhesive. In the manufacturing process, the thin-film transistor glass substrate 120 is simultaneously formed with a conductive layer 208, and then an insulating layer 18 is formed to cover the conductive films 2 0 and 2 8 in the next photomask manufacturing process, and the insulating layer 1 8 is formed. Openings 2 4 0, 2 4 2 are formed on 0. Then, the conductive films 202, 204, and 206 are simultaneously formed in the next mask process. The conductive films 20, 2 and 6 are formed on the openings 24, 2 and 2 2 respectively, and are electrically connected to the conductive films 200 and 20 8 through the openings 2 4 0 and 2 4 2 respectively. ° Since the conductive film is arranged in a checkerboard shape, in addition to the conductive film in a direction parallel to the frame rubber 160 as shown in Figure 2A, it also includes the / conductive perpendicular to the frame rubber 160.

Page 14 589498 V. Description of the invention (ίο) Electric film, as shown in Figure 2B. The outermost side of the conductive film 208 in the display area must be in the range of the liquid crystal 2 2 0, preferably up to the boundary between the liquid crystal 2 2 0 and the frame seal 1 6 (as shown in the second figure B). The innermost position of the conductive film 200 may be within the range of the frame seal 160 (as shown in the second figure B) or outside the range of the frame seal 160. The transparent conductive film 202 is formed on the insulating layer 180, and is electrically connected to the conductive films 2 0 and 2 0 through the two openings 2 4 0 and 2 4 of the insulating layer 180. The conductive film 200 shown in the second B figure can also be completely replaced by the conductive film 202, so that the conductive film starting from the junction of the liquid crystal 2 2 0 and the frame adhesive 160 to the edge of the glass substrate is transparent And is formed and formed on the insulating layer 18. If the material of the transparent conductive film 202 is selected, if the part formed outside (outside) of the frame rubber 160 is suspected to be oxidized or eroded by water vapor, etc., it can be selected to be formed only on the frame rubber 160. Within the range, or in the part beyond the range of the frame rubber, the formation of a barrier layer sufficient to resist oxidation and invasion of surnames such as moisture. When the frame adhesive hardens light 3 2 and irradiates the frame adhesive 16 from the end of the thin film transistor glass substrate 120, the inside portion of the frame adhesive 160 will not be blocked by the opaque structure. Therefore, the frame adhesive The inner part of 160 can be completely hardened to prevent the liquid crystal 2 2 from being contaminated by the unhardened frame adhesive. Compared with the structure of the prior art (such as the peripheral structure of the conventional LCD of the conventional technology in the first figure ^ is not intended), the main difference between the structure of the present invention and the conventional technology is the conductive film on the thin-film transistor glass substrate. structure. According to this paper, the frame contact of the liquid crystal must be completely hardened to avoid frame glue. Therefore, the structure of the conductive film is changed to a transparent conductive material at the innermost side of the range where the frame is coated, and the side close to the display area, and the transparent conductive material

Page 15 589498 V. Description of the invention (11) The outermost end position of the electric film can be within the frame adhesive coating range, the outside of the frame adhesive coating | cloth range, or the outermost edge of the glass substrate. The transparent conductive film can be formed in accordance with the manufacturing process or design of the liquid crystal panel, and formed with the other semiconductor structures on the panel in the same photomask manufacturing process. For example, the conductive film shown in the second A diagram 2 0 2, 2 0 4 and 2 6 can be formed simultaneously with the pixel electrode. The process description of the above preferred embodiment is only to illustrate one possible process step of the present invention, and is not intended to limit the process steps of the present invention. Furthermore, the present invention can also be applied to different liquid crystal panel structures', for example, a liquid crystal panel structure (color. Filter array, COA) in which a color filter is formed on a thin film transistor glass substrate. Therefore, compared with the conventional technology, incomplete hardening, or the increased complexity of the frame adhesive hardening process caused by the side-illumination or bottom-plate reflection methods, and the increase in the area where the liquid crystal is exposed to ultraviolet rays and the like. The structure of the periphery of the liquid crystal display panel disclosed in the present invention 'makes the conductive film of the thin-film transistor glass substrate in the area where the sealant of the liquid crystal panel is coated with the sealant ^ ^ replaced by a transparent metal material In this way, when the light is irradiated from the wide end of the thin film transistor glass to the frame adhesive, it will not be blocked by the opaque conductive film to ensure that the frame adhesive in contact with 2 ^ can be completely cured, and the liquid crystal is prevented from being incompletely cured by the adhesive. Pollution. The hardened light of the frame glue can be perpendicular to the glass substrate to illuminate the frame ^ ′ to reduce the chance of the liquid crystal being illuminated by the light, to ensure the quality of the liquid crystal. The hardened light of the glue of the “stone” frame glue can be perpendicular to the glass substrate to illuminate the frame glue. With such a frame, the manufacturing process is easier than the conventional hardening technology, and the process conditions for making the liquid crystal dripping are also more relaxed.

Page 16

589498 V. Description of the invention (12) The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of patent application for the present invention; all other equivalent changes made without departing from the spirit disclosed by the present invention Or modifications should be included in the scope of patent application described below.

589498 Brief description of the drawings The first diagram is a schematic diagram of a peripheral structure of a conventional liquid crystal display panel; and the second diagram A and the second diagram B are diagrams of a preferred embodiment of the present invention; Representative symbols of the main parts: 1 0 LCD panel 1 0 0 color filter glass substrate 1 2 0 thin film transistor glass substrate 1 4 0 black matrix 1 6 0 frame adhesive '1 8 0 insulating layer 2 0 0 conductive film 2 0 2 conductive film 2 04 conductive film 2 0 6 conductive film τ: 2 0 8 conductive film 2 2 0 liquid crystal 24 0 opening 242 opening 3 0 0 color filter glass substrate frame hardened light 3 2 0 thin film transistor glass Hardened light on the frame side of the substrate

Page 18

Claims (1)

589498 6. Application patent scope 1. A structure around a liquid crystal display panel, including: a first glass substrate having a black matrix on one surface of the first glass substrate; a second glass substrate having a surface of the second glass substrate A thin film transistor is provided; and a frame adhesive is applied between the first glass substrate and the second glass substrate to connect the first glass substrate and the second glass substrate so that the first glass The surface of the substrate with a black matrix is combined with the surface of the second glass substrate with a thin film transistor; The surface where the second glass substrate is connected to the frame adhesive includes an & side portion close to a display area of the liquid crystal display panel, and the inner portion includes: a first insulating layer; and a first conductive film, The first conductive film is formed on the first insulating layer, and the material of the first conductive film is transparent. r .. 2 If the structure around the liquid crystal display panel of item 1 of the patent application scope further includes a surface on which the second glass substrate is connected to the frame adhesive, and a portion near the outer side of the edge of the liquid crystal display panel, The outer portion includes: a second conductive film; and a first insulating layer formed on the second conductive film; The first conductive film and the second conductive film are electrically connected at an overlapping portion of the inner portion and one of the outer portions. For example, the structure around the liquid crystal display panel of the first patent application scope, Page 19 589498; Sixth, the scope of patent application, in which the first conductive film is indium tin oxide. I. I 4. If the structure around the liquid crystal display panel in item 2 of the patent application, the material of the ti second conductive film is opaque material. 5. For example, the structure around the liquid crystal display panel of the second patent application, wherein the material of the second metal conductive film is one of aluminum, aluminum-containing multilayer metal structure or aluminum alloy. 6. For example, the structure around the liquid i display panel in the second patent application scope, where the first insulating layer and the second insulating layer are formed in the same photomask manufacturing process, and are connected to each other. 7. For example, the structure around the liquid crystal display panel in the second patent application range, wherein the first conductive film and the second conductive film are respectively formed in different photomask manufacturing processes. 8. For the structure around the liquid crystal display panel of the second patent application range, wherein the overlapping portion includes: the second conductive film; the second insulating layer is formed on the second conductive film and has an opening · I port; and i, the first conductive film is formed on the second insulating layer. Page 20 589498 6. Scope of patent application 1 4. For the structure around the liquid crystal display panel of the scope of patent application item 10, wherein the second conductive film and the third conductive film are formed in different photomask processes, respectively. In the formation of the middle edge of the plate, the surface of the Zhou Cheng plate shows a light-emitting electric conductor that is isomorphic to the liquid film. The first and second perimeters and fan touches are ^ 豸 1Rv / 4. The special guide of Lidian, please apply for this first. 5 1 The structure of the edge and the peripheral plate shows the crystal liquid. I < Section: Enclose the Fan Baoli branch, please stack B ~ 1 ^ 2 as the 6th of the film, and the 3rd should be on The electrical edge of the forming film layer must be connected to the af- 3m 1 with a combined layer. The electrical connection must be connected to the forming film and connected to the first edge of the forming film. , The opening of the panel shows that the obvious crystal layer liquid edge of the third item is the first pass. Fan through the Lee film with special electrical properties, please conduct the application of the same phase. • Medium film T * 1 its electricity 1 8. —A structure around the liquid crystal display panel, including: a first glass substrate, the first glass substrate A surface has a black matrix; a second glass substrate having a thin film transistor on one surface thereof; and a frame adhesive coated between the first glass substrate and the second glass substrate, Used to connect the first glass substrate and the second glass substrate so that the Page 22 589498 6. Scope of patent application. The surface of the first glass substrate with a black matrix is combined with the surface of the second glass substrate with a thin film transistor; wherein a region is the second glass substrate and The innermost surface of the frame adhesive connection to the edge of the liquid crystal display panel includes a first insulating layer; and a first conductive film formed on the first insulating layer. The material of the first conductive film For transparent materials. 19. The structure around the liquid crystal display panel according to item 18 of the patent application scope, wherein the first conductive film is indium tin oxide. φ 20. If the structure around the liquid crystal display panel of item 18 in the patent application scope further includes a liquid crystal display area inside the frame, the liquid crystal display area includes a second conductive film; and a A second insulating layer covers the second conductive film 10; wherein, at an overlapping portion of the inner portion and one of the liquid crystal display regions, the first conductive film is electrically connected to the second conductive film. 21. The structure around the liquid crystal display panel according to item 19 of the patent application, wherein the overlapping portion includes: the second conductive film; the second insulating layer is formed on the second conductive film and has an opening ;as well as Page 23 589498 6. Scope of patent application The first conductive film is formed on the second insulating layer. Page 24