JP7363332B2 - Electro-optical devices, electronic devices, and mounting state evaluation methods - Google Patents

Description

The present invention relates to an electro-optical device, an electronic device, and a mounting state evaluation method.

An example of an electro-optical device is a liquid crystal panel used as a light valve of a liquid crystal projector. In such liquid crystal panels, as the definition becomes higher and the size becomes smaller, it has been proposed to connect a plurality of wiring boards to one liquid crystal panel in order to increase the packaging density. For example, in Patent Document 1, two flexible wiring boards are connected to a connection area of a liquid crystal panel. Specifically, in the connection area of the liquid crystal panel, connection parts are formed in two stages on the edge side and the back side of the liquid crystal panel, and the first flexible board is connected to the first connection part on the end side. A second flexible board was connected to the second connection portion on the rear side. The back side of the liquid crystal panel is closer to the inside than the end side.

JP2018-128488A

However, the electro-optical device of Patent Document 1 has a problem in that it is difficult to verify whether or not the electrical connection of the second flexible substrate is reliably performed. Specifically, the second flexible board is connected to the second mounting terminal on the back side so as to overlap the first mounting portion of the first flexible board. Therefore, there was a concern that the electrical connection would become unstable due to the influence of the step difference in the first mounting portion. Therefore, there has been a desire for an electro-optical device that can confirm the electrical connection state of wiring boards that are mounted in multiple stages and has good display quality.

The electro-optical device includes an electro-optic panel having a connection area, a first wiring board and a second wiring board connected to the connection area via an anisotropic conductive film, and the electro-optic device includes: In the connection area, a first panel terminal portion including a first panel terminal and a second panel terminal portion including a second panel terminal are arranged spaced apart from the end portion in this order, and at the connection portion of the first wiring board. A first wiring terminal provided in a certain first wiring terminal section is electrically connected to the first panel terminal, the second wiring board is arranged to overlap the first wiring board, and a connecting part of the second wiring board A second wiring terminal included in the second wiring terminal section is electrically connected to the second panel terminal, and the second panel terminal section includes a detection terminal disposed on the first panel terminal section side. , the detection terminal is electrically connected to the first panel terminal.

In the electro-optical device described above, it is preferable that the detection terminal and the first panel terminal are integrated.

In the electro-optical device described above, it is preferable that the length of the detection terminal in a direction orthogonal to the first direction from the second panel terminal toward the detection terminal is longer than the second panel terminal.

In the electro-optical device described above, it is preferable that the second wiring terminal includes a widened portion in a portion overlapping with the detection terminal in a plan view viewed from the thickness direction of the electro-optic panel.

In the electro-optical device described above, the second panel terminal section has a data panel terminal that transmits or receives a signal, and the length of the second panel terminal in the first direction from the second panel terminal toward the detection terminal. The length is shorter than the data panel terminal, and an end of the detection terminal in the opposite direction to the first direction is arranged closer to the second panel terminal than an end of the data panel terminal in the first direction. is preferred.

In the above electro-optical device, the second wiring board has a data wiring terminal disposed overlapping with the data panel terminal in a plan view seen from the thickness direction of the electro-optical panel, and the data wiring terminal is arranged to overlap the data panel terminal. It is preferable that the first direction side protrudes from the detection terminal, and the connection wiring connecting the first panel terminal and the detection terminal is recessed on the data panel terminal side.

In the above electro-optical device, the second wiring board has a data wiring terminal disposed overlapping with the data panel terminal in a plan view seen from the thickness direction of the electro-optical panel, and the data wiring terminal is arranged to overlap the data panel terminal. It is preferable that a first direction side protrudes from an end of the detection terminal on the first direction side, and a surface of a connection wiring connecting the first panel terminal and the detection terminal is covered with an insulating film.

In the above electro-optical device, the second panel terminal portion has a data panel terminal for transmitting or receiving a signal, and in a plan view from the thickness direction of the electro-optic panel, the second wiring board is connected to the data panel terminal. It is preferable to have a data wiring terminal arranged overlapping the terminal, and a dummy terminal arranged between the second panel terminal and the data panel terminal and not transmitting or receiving a signal.

In the above electro-optical device, it is preferable that the second panel terminal and the detection terminal are arranged at both ends of the second panel terminal section, and the second wiring terminal is arranged at both ends of the second wiring terminal section. .

An electronic device is characterized by including the electro-optical device described above.

The mounting state evaluation method includes an electro-optical device including an electro-optical panel having a connection area, and a first wiring board and a second wiring board connected to the connection area via an anisotropic conductive film. In the connection area, a first panel terminal section having a first panel terminal and a second panel terminal section having a second panel terminal are spaced apart from each other in this order from the end side, and the first wiring board A first wiring terminal included in a first wiring terminal section, which is a connection part, is electrically connected to the first panel terminal, and the second wiring board is disposed overlapping the first wiring board, and the second wiring terminal is electrically connected to the first panel terminal. A second wiring terminal included in a second wiring terminal section, which is a connection section of the board, is electrically connected to the second panel terminal, and a detection terminal disposed on the first panel terminal side is connected to the second panel terminal section. In an electro-optical device including a terminal, the detection terminal is electrically connected to the first panel terminal, the electro-optic device detects resistance between the first wiring terminal and the second wiring terminal, and detects the resistance between the first wiring terminal and the second wiring terminal. The present invention is characterized by detecting whether or not the panel and the second wiring board are electrically connected.

FIG. 1 is a schematic perspective view showing the configuration of an electro-optical device according to a first embodiment. FIG. 1 is a schematic side view showing the configuration of an electro-optical device. FIG. 3 is a schematic plan view for explaining the positions of wiring terminals and panel terminals of a wiring board. FIG. 3 is a schematic side sectional view of main parts for explaining the connection between the wiring terminals of the wiring board and the panel terminals. FIG. 3 is a schematic side sectional view of main parts for explaining the connection between the wiring terminals of the wiring board and the panel terminals. FIG. 4 is a schematic side sectional view for explaining a state of poor connection of the second wiring board. FIG. 7 is a schematic plan view for explaining the positions of wiring terminals and panel terminals of a wiring board according to a second embodiment. FIG. 7 is a schematic plan view for explaining the positions of wiring terminals and panel terminals of a wiring board according to a third embodiment. FIG. 7 is a schematic plan view for explaining the positions of wiring terminals and panel terminals of a wiring board according to a fourth embodiment. FIG. 7 is a schematic plan view for explaining the positions of wiring terminals and panel terminals of a wiring board according to a fifth embodiment. FIG. 7 is a schematic plan view for explaining the positions of wiring terminals and panel terminals of a wiring board according to a sixth embodiment. FIG. 3 is a schematic side sectional view of main parts for explaining connection wiring. FIG. 7 is a schematic plan view for explaining the positions of wiring terminals and panel terminals of a wiring board according to a seventh embodiment. FIG. 7 is a configuration diagram showing the configuration of a projection display device using an electro-optical device according to an eighth embodiment.

First Embodiment In this embodiment, characteristic examples of an electro-optical device and a mounting state evaluation method for evaluating a mounting state using the electro-optical device and a wiring board will be described with reference to the drawings. An electro-optical device according to the first embodiment will be described according to FIGS. 1 to 6. FIG. 1 is a schematic perspective view showing the configuration of an electro-optical device. FIG. 2 is a schematic side view showing the configuration of the electro-optical device. As shown in FIGS. 1 and 2, the electro-optical device 1 includes a liquid crystal panel 2 as an electro-optical panel. The liquid crystal panel 2 includes a second dustproof substrate 3, an element substrate 4, a counter substrate 5, and a first dustproof substrate 6, which are stacked in this order. The second dustproof substrate 3, the element substrate 4, the counter substrate 5, and the first dustproof substrate 6 are each made of a transparent glass plate.

The direction from the second dustproof substrate 3 to the first dustproof substrate 6 in the thickness direction of the liquid crystal panel 2 is defined as the +Z direction. When viewed from the +Z direction, the liquid crystal panel 2 has a rectangular shape. The direction along one of two adjacent sides of the rectangle is defined as the X direction, and the direction along the other side is defined as the Y direction. The X direction, Y direction, and Z direction are orthogonal to each other.

When the display on the liquid crystal panel 2 is enlarged and projected, the first dustproof substrate 6 and the second dustproof substrate 3 are made less susceptible to the influence of attached foreign matter. Transparent substrates such as quartz substrates are used for the second dustproof substrate 3, the element substrate 4, the counter substrate 5, and the first dustproof substrate 6.

A liquid crystal layer is arranged between the element substrate 4 and the counter substrate 5. Pixel electrodes are arranged in a matrix on the element substrate 4. A switching element that switches energization to the pixel electrode is electrically connected to each pixel electrode. A TFT (Thin Film Transistor) is used as the switching element. A counter electrode is arranged on the counter substrate 5 . The counter electrode is arranged to face the plurality of pixel electrodes. For example, a transparent conductive film such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide) is used for the pixel electrode and the counter electrode.

A connection area 7 is provided on the element substrate 4 in the −Y direction. In the connection area 7, the surface of the element substrate 4 in the +Z direction is exposed from the counter substrate 5, and various terminals are arranged in the connection area 7. In the connection area 7, a plurality of first panel terminals 8 are arranged in the X direction near the end of the element substrate 4 in the −Y direction. A plurality of second panel terminals 9 are arranged in the +Y direction of the arrangement of the first panel terminals 8 in the X direction. The arrangement of the first panel terminals 8 and the arrangement of the second panel terminals 9 are substantially parallel. In the connection area 7, the element substrate 4 and the first wiring board 12 are connected via a first anisotropic conductive film 11 as an anisotropic conductive film, and a second anisotropic conductive film as an anisotropic conductive film is connected to the first wiring board 12. The element substrate 4 and the second wiring board 14 are connected via 13.

The first wiring board 12 includes a first substrate 15 . A plurality of first wirings 16 are arranged on the first substrate 15 in the X direction. A portion of the first wiring 16 is covered with a first insulating film 17. The end of the first wiring 16 of the first wiring board 12 in the +Y direction is exposed from the first insulating film 17 . This exposed region is defined as a first wiring terminal portion 12a, which is a connection portion of the first wiring board 12. A portion of the first wiring 16 exposed from the first insulating film 17 in the first wiring terminal portion 12a is referred to as a first wiring terminal 18. The first wiring terminal portion 12a includes a first wiring terminal 18. The first wiring 16 has a first wiring external terminal 19 exposed from the first insulating film 17 at the end in the −Y direction.

A first anisotropic conductive film 11 is arranged between the first wiring terminal 18 and the first panel terminal 8. The first wiring board 12 is bonded to the element substrate 4 using the first anisotropic conductive film 11 . The first wiring terminal 18 is electrically connected to the first panel terminal 8 by the first anisotropic conductive film 11 .

The first wiring board 12 includes a first driving IC 20 (Integrated Circuit). The first driving IC 20 is electrically connected to the first wiring external terminal 19 and the first wiring terminal 18 via the first wiring 16 . The first driving IC 20 drives switching elements arranged on the element substrate 4.

The second wiring board 14 includes a second board 21 . A plurality of second wirings 22 are arranged on the second substrate 21 in the X direction. A portion of the second wiring 22 is covered with a second insulating film 23. The end portion of the second wiring 22 of the second wiring board 14 in the +Y direction is exposed from the second insulating film 23 . This exposed region is defined as a second wiring terminal portion 14a which is a connection portion of the second wiring board 14. A portion of the second wiring 22 exposed from the second insulating film 23 in the second wiring terminal portion 14 a is defined as a second wiring terminal 24 . The second wiring terminal portion 14a includes a second wiring terminal 24. The second wiring 22 includes a second wiring external terminal 25 exposed from the second insulating film 23 at the end in the −Y direction.

A second anisotropic conductive film 13 is arranged between the second wiring terminal 24 and the second panel terminal 9. The second wiring board 14 is bonded to the element substrate 4 via the second anisotropic conductive film 13 . The second wiring terminal 24 is electrically connected to the second panel terminal 9 by the second anisotropic conductive film 13 .

The second wiring board 14 includes a second driving IC 26. The second driving IC 26 is electrically connected to the second wiring external terminal 25 and the second wiring terminal 24 via the second wiring 22. The second driving IC 26 drives the switching elements arranged on the element substrate 4. The material of the first substrate 15 and the second substrate 21 is resin such as polyimide or polyester. The first wiring board 12 and the second wiring board 14 are also referred to as flexible printed circuit boards.

FIG. 3 is a schematic plan view for explaining the positions of the wiring terminals of the wiring board and the panel terminals. 4 and 5 are schematic side cross-sectional views of main parts for explaining the connection between the wiring terminals of the wiring board and the panel terminals. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. FIG. 5 is a cross-sectional view taken along line BB in FIG. 3.

As shown in FIGS. 3, 4, and 5, the end of the element substrate 4 in the -Y direction is defined as the end 4a of the element substrate 4. In the connection area 7, a first panel terminal section 27 and a second panel terminal section 28 are spaced apart from each other in this order from the end 4a side. The first panel terminal portion 27 is an area where the first panel terminal 8 is arranged. The second panel terminal portion 28 is an area where the second panel terminal 9 is arranged.

The terminals at both ends in the X direction of the first panel terminals 8 are referred to as first panel terminals 29 . Among the first panel terminals 29, the terminal at the end in the +X direction is the first right panel terminal 29a as the first panel terminal, and the terminal at the end in the -X direction is the first left panel terminal 29b as the first panel terminal. shall be. Among the second panel terminals 9, terminals at both ends in the X direction are designated as second panel terminals 31. Among the second panel terminals 31, the terminal at the end in the +X direction is a second right panel terminal 31a as a second panel terminal, and the terminal at the end in the -X direction is a second left panel terminal 31b as a second panel terminal. shall be. In this way, the first panel terminal section 27 includes the first panel terminal 29 and the second panel terminal section 28 includes the second panel terminal 31. A dummy terminal may be provided further outside the first panel terminal 29 or the second panel terminal 31. These dummy terminals are terminals to which power and signals for driving the liquid crystal panel 2 are not input/output. Further, these dummy terminals may be reinforcing terminals for the purpose of suppressing peeling from the left and right ends of the wiring board.

In the second panel terminal portion 28 , a detection terminal 32 is arranged on the first panel terminal 29 side of the second panel terminal 31 . Among the detection terminals 32, the terminal at the end in the +X direction is defined as a right detection terminal 32a, and the terminal at the end in the -X direction is defined as a left detection terminal 32b. A right connection wiring 33a is arranged between the right detection terminal 32a and the first right panel terminal 29a. The right detection terminal 32a is electrically connected to the first right panel terminal 29a by the right connection wiring 33a. A left connection wiring 33b is arranged between the left detection terminal 32b and the first left panel terminal 29b. The left detection terminal 32b is electrically connected to the first left panel terminal 29b by the left connection wiring 33b. The right connection wiring 33a and the left connection wiring 33b are referred to as connection wiring 33. The detection terminal 32 is electrically connected to the first panel terminal 29 by a connection wiring 33 .

The element substrate 4 and the first wiring board 12 are connected by overlapping the first panel terminal part 27 and the first wiring terminal part 12a in a plan view of the liquid crystal panel 2 viewed from the +Z direction. The first wiring terminal 18 is electrically connected to the first panel terminal 29.

The second wiring board 14 is arranged to overlap the first wiring board 12. In a plan view of the liquid crystal panel 2 viewed from the +Z direction, the second panel terminal portion 28 and the second wiring terminal portion 14a are overlapped, and the element substrate 4 and the second wiring substrate 14 are connected by the second anisotropic conductive film 13. . The second wiring terminal 24 is electrically connected to the second panel terminal 31. The second wiring terminal 24 at the end in the +X direction is defined as a second right wiring terminal 24a as a second wiring terminal. The second right wiring terminal 24a is connected to the second right panel terminal 31a and the right detection terminal 32a by the second anisotropic conductive film 13. The second wiring terminal 24 at the end in the −X direction is defined as a second left wiring terminal 24b as a second wiring terminal. The second left wiring terminal 24b is connected to the second left panel terminal 31b and the left detection terminal 32b by the second anisotropic conductive film 13.

In the second panel terminal section 28, the second panel terminal 31 is a terminal used for inspection. The second panel terminal 9 between the second right panel terminal 31 a and the second left panel terminal 31 b includes a data panel terminal 34 . The data panel terminal 34 is a terminal for inputting a signal for driving the liquid crystal panel 2. The detection terminal 32 is not arranged on the −Y direction side of the data panel terminal 34. The second panel terminal 9 may include a power terminal that supplies power for driving the panel, for example, a power terminal for VDD and VSS.

As shown in FIG. 5, the first panel terminal 29 and the first wiring terminal 18 are electrically connected by the first anisotropic conductive film 11. The first wiring terminal 18 and the detection terminal 32 are electrically connected by a connection wiring 33. In the first wiring board 12 , the first wiring terminal 18 and the first wiring external terminal 19 are electrically connected by the first wiring 16 . Therefore, the detection terminal 32 and the first wiring external terminal 19 are electrically connected.

When the second panel terminal section 28 and the second wiring terminal section 14a are connected normally, the second wiring terminal 24 and the detection terminal 32 are electrically connected by the second anisotropic conductive film 13. In the second wiring board 14 , the second wiring terminal 24 and the second wiring external terminal 25 are electrically connected by the second wiring 22 . Therefore, the detection terminal 32 and the second wiring external terminal 25 are electrically connected. That is, the first wiring external terminal 19 and the second wiring external terminal 25 are electrically connected via the element substrate 4.

An electrical resistance measuring device 35 is disposed between the first wiring external terminal 19 and the second wiring external terminal 25 to measure the electrical resistance between the first wiring external terminal 19 and the second wiring external terminal 25. In the electrical resistance measuring device 35, a DC power source 36, an ammeter 37, and a resistance element 38 are connected in series in this order. The electrical resistance measuring device 35 includes a first probe 35a and a second probe 35b. The first probe 35a is electrically connected to a DC power supply 36. The second probe 35b is electrically connected to the resistance element 38. Since the electrical resistance between the first probe 35a and the second probe 35b and the current flowing through the ammeter 37 are inversely proportional, by dividing a constant by the current flowing through the ammeter 37, the first probe 35a and the second probe 35b is measured.

The first probe 35a is electrically connected to the first wiring external terminal 19. The second probe 35b is electrically connected to the second wiring external terminal 25. At this time, the electrical resistance between the first wiring terminal 18 and the second wiring terminal 24 can be detected. When the second panel terminal section 28 and the second wiring terminal section 14a are normally connected, the first wiring external terminal 19 and the second wiring external terminal 25 are electrically connected. At this time, the electrical resistance between the first probe 35a and the second probe 35b is measured. If the electrical resistances of the first wiring 16, the second wiring 22, and the connection wiring 33 are known in advance, the electrical resistance component of the portion passing through the detection terminal 32 can be calculated by subtracting them. This electrical resistance component is, for example, several tens of ohms or less.

FIG. 6 is a schematic side cross-sectional view for explaining a state of poor connection of the second wiring board. As shown in FIG. 6, the second wiring board 14 is arranged to overlap the first wiring board 12. The second wiring board 14 is bent near the second wiring terminal 24 while being subjected to stress. Therefore, the connection between the second panel terminal section 28 and the second wiring terminal section 14a is more likely to be defective than the connection between the first panel terminal section 27 and the first wiring terminal section 12a. Specifically, connection failures tend to occur in the -Y direction between the second panel terminal section 28 and the second wiring terminal section 14a.

The detection terminal 32 is arranged on the −Y direction side of the second panel terminal portion 28. Therefore, when the connection between the second wiring terminal 24 and the second panel terminal 31 is insufficient, the connection between the second wiring terminal 24 and the detection terminal 32 is also insufficient. Furthermore, even when the connection between the second wiring terminal 24 and the second panel terminal 31 is insufficient, for example, a high resistance connection, the second wiring terminal 24 and the detection terminal 32 may have a poor connection or a high resistance connection. become. Therefore, by inspecting the connection state between the second wiring terminal 24 and the detection terminal 32, it is possible to detect whether the connection between the second wiring terminal 24 and the second panel terminal 31 is in a reliable state.

In this way, by detecting the electrical resistance between the first wiring terminal 18 and the second wiring terminal 24, it is detected whether the liquid crystal panel 2 and the second wiring board 14 are electrically connected. Although the determination value of the electric resistance is not particularly limited, in this embodiment, for example, when it exceeds 30 ohms, it is determined that there is a connection failure.

In the electro-optical device 1, when the second wiring terminal 24 has a low resistance connection with the detection terminal 32, the electrical resistance between the first wiring external terminal 19 and the second wiring external terminal 25 becomes low. When the second wiring terminal 24 is connected to the detection terminal 32 with high resistance, the electrical resistance between the first wiring external terminal 19 and the second wiring external terminal 25 becomes high. Therefore, in the electro-optical device 1 and the method for evaluating the mounting state of the electro-optical device 1, the electrical resistance of the current flowing through the first wiring terminal 18, the first panel terminal 29, the detection terminal 32, and the second wiring terminal 24 is tested. As a result, the conduction state between the liquid crystal panel 2 and the second wiring board 14 can be easily confirmed, so that the connection between the element substrate 4 and the second wiring board 14 can be easily guaranteed. As a result, the liquid crystal panel 2 can be made highly reliable. Further, by mounting the electrical resistance measuring mechanism shown in FIG. 5 in an electronic device, it is possible to periodically monitor the electrical resistance between the first wiring terminal 18 and the second wiring terminal 24. In this way, failures in the electro-optical device 1 can be predicted in advance, an alert can be issued, and appropriate maintenance can be performed.

The first panel terminal 29, the connection wiring 33, and the detection terminal 32 are integrated. That is, the first panel terminal 29, the connection wiring 33, and the detection terminal 32 are made of the same conductive film. Since the detection terminal 32 and the first panel terminal 29 are integrated, the terminal pattern can be made into a simpler shape than when the first panel terminal 29 and the detection terminal 32 are formed as separate films.

As shown in FIG. 3, the detection terminals 32 are arranged at both ends of the second panel terminal section 28. At the ends of the second wiring terminal section 14a and the second panel terminal section 28 in the +X direction, the right detection terminal 32a establishes a reliable electrical connection between the second panel terminal 31 and the second wiring terminal 24. It is possible to detect whether there is a person or not. At the ends of the second wiring terminal section 14a and the second panel terminal section 28 in the -X direction, the left detection terminal 32b establishes a reliable electrical connection between the second panel terminal 31 and the second wiring terminal 24. It is possible to detect whether the Therefore, the reliability of the electrical connection of the second panel terminal portion 28 can be easily confirmed.

Second Embodiment This embodiment differs from the first embodiment in that the shape of the detection terminal 32 shown in FIG. 3 is different. Note that description of the same points as in the first embodiment will be omitted. FIG. 7 is a schematic plan view for explaining the positions of the wiring terminals and panel terminals of the wiring board. As shown in FIG. 7, the electro-optical device 41 includes a liquid crystal panel 42 as an electro-optical panel. In the second panel terminal section 28 , a detection terminal 43 is arranged between the second panel terminal 31 and the first panel terminal 29 . -The Y direction is the first direction 44. The first direction 44 is a direction from the second panel terminal 31 toward the detection terminal 43. The detection terminals 43 are arranged at both ends of the second panel terminal section 28. The detection terminal 43 on the +X direction side is the right detection terminal 43a. The detection terminal 43 on the -X direction side is the left detection terminal 43b.

The length of the detection terminal 43 in the direction perpendicular to the first direction 44 is longer than the second panel terminal 31 . The right detection terminal 43a protrudes from the second panel terminal 31 in the +X direction. The left detection terminal 43b projects from the second panel terminal 31 in the −X direction. In this way, the detection terminal 43 projects outward in the longitudinal direction of the second panel terminal portion 28 .

The second wiring terminal section 14a in FIG. 7 is arranged diagonally with respect to the second panel terminal section 28. This shows a state in which the second wiring board 14 is disposed obliquely with respect to its original position in the mounting process of the second wiring board 14. Such θ rotation of a wiring board is a phenomenon that may occur during manufacturing, and the size, pitch, etc. of panel terminals are determined in consideration of the intersection of θ rotations. At this time, if the right detection terminal 43a and the left detection terminal 43b are provided with protrusions, even when the second wiring terminal 24 is diagonal with respect to the first direction 44, the second wiring terminal 24 can be connected to the second wiring terminal 24 in a plan view of the liquid crystal panel 42. The detection terminal 43 tends to overlap. Therefore, even when the second wiring terminal 24 is oblique with respect to the first direction 44, it can be evaluated whether or not the second wiring terminal 24 and the detection terminal 43 are electrically connected.

Third Embodiment This embodiment differs from the second embodiment in that the shape of the detection terminal 43 shown in FIG. 7 is different. Note that description of the same points as in the second embodiment will be omitted. FIG. 8 is a schematic plan view for explaining the positions of the wiring terminals and panel terminals of the wiring board. As shown in FIG. 8, the electro-optical device 47 includes a liquid crystal panel 48 as an electro-optical panel. In the second panel terminal section 28 , a detection terminal 49 is arranged between the second panel terminal 31 and the first panel terminal 29 . The detection terminals 49 are arranged at both ends of the second panel terminal section 28 . The detection terminal 49 on the +X direction side is the right detection terminal 49a. The detection terminal 49 on the −X direction side is the left detection terminal 49b.

The length of the detection terminal 49 in the direction orthogonal to the first direction 44 is longer than the second panel terminal 31 . The right detection terminal 49a protrudes from the second panel terminal 31 in the +X direction and also in the -X direction. The left detection terminal 49b also protrudes from the second panel terminal 31 in the +X direction and also in the -X direction. In this way, the detection terminals 49 protrude in both longitudinal directions of the second panel terminal portion 28 .

The second wiring terminal portion 14a is arranged diagonally with respect to the second panel terminal portion 28. This shows a state in which the second wiring board 14 is disposed obliquely with respect to its original position in the mounting process of the second wiring board 14. At this time, if protrusions are provided on the right detection terminal 49a and the left detection terminal 49b, even when the second wiring terminal 24 is oblique with respect to the first direction 44, it can be detected as the second wiring terminal 24 in a plan view of the liquid crystal panel 48. The terminal 49 tends to overlap. Since the right detection terminal 49a and the left detection terminal 49b have a protrusion in the +X direction and a protrusion in the -X direction, electrical resistance can be detected at the left and right detection terminals 49 regardless of the direction of θ rotation of the second wiring board 14. Sensitivity is improved. Therefore, even when the second wiring terminal 24 is oblique with respect to the first direction 44, it can be evaluated whether or not the second wiring terminal 24 and the detection terminal 49 are electrically connected.

Fourth Embodiment This embodiment differs from the third embodiment in that the shapes of the second wiring terminals 24 at both ends of the second wiring terminal portion 14a shown in FIG. 8 are different. Note that description of the same points as in the third embodiment will be omitted. FIG. 9 is a schematic plan view for explaining the positions of the wiring terminals and panel terminals of the wiring board. As shown in FIG. 9, the electro-optical device 51 includes a liquid crystal panel 48 as an electro-optical panel.

Second wiring terminals 52 are arranged in the X direction on the second wiring terminal portion 14a of the second wiring board 14. Among the second wiring terminals 52, the second wiring terminal 52 at the end in the +X direction is defined as a second right-end wiring terminal 52a. Among the second wiring terminals 52, the second wiring terminal 52 at the end in the −X direction is defined as a second left-end wiring terminal 52b. In a plan view of the liquid crystal panel 48 viewed from the +Z direction, the second right end wiring terminal 52a and the second left end wiring terminal 52b have a portion that partially overlaps with the detection terminal 49.

In a plan view of the liquid crystal panel 48 viewed from the +Z direction, the second right end wiring terminal 52a and the second left end wiring terminal 52b are provided with a widened portion 53 in a portion overlapping with the detection terminal 49. The widened portion 53 has a length in a direction perpendicular to the first direction 44 that is longer than the portion of the second wiring terminal 52 overlapping with the second panel terminal 31 . Specifically, the widened portion 53 protrudes in the +X direction from the second wiring terminal 52 in the portion overlapping with the second panel terminal 31, and also protrudes in the −X direction.

Since the widened portion 53 is provided, even if the relative positions of the second right end wiring terminal 52a and the second left end wiring terminal 52b in the X direction with respect to the detection terminal 49 are shifted, the second right end wiring terminal 52a and the second left end wiring terminal 52b can be The widened portion 53 of the wiring terminal 52 and the detection terminal 49 tend to overlap. Note that if the detection terminal 49 is also provided with a widened portion, the contact area with the widened portion 53 of the second wiring terminal 52 increases, so that the detection sensitivity of electrical resistance at the detection terminal 49 is improved. Therefore, even if the relative positions of the second wiring terminal 52 and the detection terminal 49 are shifted, it can be evaluated whether the second wiring terminal 52 and the detection terminal 49 are electrically connected.

Fifth Embodiment This embodiment differs from the first embodiment in that the shapes of the detection terminal 32 and connection wiring 33 shown in FIG. 3 are different. Note that description of the same points as in the first embodiment will be omitted. FIG. 10 is a schematic plan view for explaining the positions of the wiring terminals and panel terminals of the wiring board. As shown in FIG. 10, the electro-optical device 56 includes a liquid crystal panel 57 as an electro-optical panel.

In the second panel terminal section 28, a plurality of second panel terminals 58 are arranged in the +Y direction of the arrangement of the first panel terminals 8 in the X direction. Among the second panel terminals 58, terminals at both ends in the X direction are designated as second panel terminals 59. Among the second panel terminals 59, the terminal at the end in the +X direction is a second right panel terminal 59a, and the terminal at the end in the -X direction is a second left panel terminal 59b. Among the second panel terminals 59, a terminal between the second right panel terminal 59a and the second left panel terminal 59b includes a data panel terminal 60. The data panel terminal 60 is a terminal for transmitting or receiving signals. Thus, the second panel terminal section 28 has a data panel terminal 60 for transmitting or receiving signals. In the first direction 44 , the second panel terminal 59 has a shorter length than the data panel terminal 60 . That is, the lengths of the second right panel terminal 59a and the second left panel terminal 59b are shorter than the data panel terminal 60.

In the second panel terminal section 28 , a detection terminal 61 is arranged between the second panel terminal 59 and the first panel terminal 29 . The detection terminals 61 are arranged at both ends of the second panel terminal section 28 . The detection terminal 61 at the end in the +X direction is the right detection terminal 61a. The detection terminal 61 at the end in the -X direction is the left detection terminal 61b. The second end 61c of the detection terminal 61 as the end in the opposite direction to the first direction 44 is closer to the second panel terminal 59 than the first end 60d as the end of the data panel terminal 60 in the first direction 44 side. It is located in

The second wiring terminal section 14a in FIG. 10 is arranged diagonally with respect to the second panel terminal section 28. This shows a state in which the second wiring board 14 is disposed obliquely with respect to its original position in the mounting process of the second wiring board 14. At this time, since the detection terminal 61 is arranged near the second panel terminal 59 in the first direction 44, even if the second wiring terminal 24 is diagonal with respect to the first direction 44, the second wiring terminal 24 It can be easily overlapped with the detection terminal 61.

Alignment marks (not shown) for attaching the second wiring board 14 are provided on the left and right sides of the second panel terminal portion 28 on an imaginary line passing through the center point of the second panel terminal 58. Therefore, an event occurs in which the second wiring board 14 is disposed obliquely (rotated by θ) with respect to the above-mentioned virtual line. As shown in the figure, when the second wiring terminal 24 is arranged diagonally with respect to the first direction 44, the end of the second right wiring terminal 24a on the -Y direction side is shifted in the +X direction. For example, if the distance from the center point of the second panel terminal 58 to the detection terminal 61 is L and the amount of rotation of the second wiring board 14 is θ, the amount of deviation in the +X direction is approximately Lxθ since θ is a small value. Become. The second end 61c of the detection terminal 61 is close to the second right panel terminal 59a. That is, the second right wiring terminal 24a with a smaller L overlaps with the right detection terminal 61a. The second left wiring terminal 24b overlaps with the left detection terminal 61b.

Since the detection terminal 61 is brought close to the center line of the second panel terminal 58, even when the second wiring terminal 24 is diagonal with respect to the first direction 44, the second wiring terminal 24 and the detection terminal can be easily seen in a plan view of the liquid crystal panel 57. 61 tends to overlap. Therefore, even when the second wiring terminal 24 is oblique with respect to the first direction 44, it is possible to evaluate whether or not the second wiring terminal 24 and the detection terminal 61 are electrically connected.

A connection wiring 62 is arranged between the detection terminal 61 and the first panel terminal 29. The connection wiring 62 electrically connects the first panel terminal 29 and the detection terminal 61. A right connection wiring 62a is arranged between the right detection terminal 61a and the first right panel terminal 29a. A left connection wiring 62b is arranged between the left detection terminal 61b and the first left panel terminal 29b.

In the second wiring terminal 24, the terminal between the second right wiring terminal 24a and the second left wiring terminal 24b includes a data wiring terminal 24c. In a plan view of the liquid crystal panel 57 viewed from the Z direction, the second wiring board 14 has data wiring terminals 24c disposed overlapping the data panel terminals 60. The data wiring terminal 24c protrudes from the detection terminal 61 in the first direction 44. That is, the data wiring terminal 24c protrudes from the boundary 61d of the detection terminal 61 in the first direction 44.

The connection wiring 62 is recessed on the data panel terminal 60 side. The right connection wiring 62a is recessed on the -X direction side where the data wiring terminal 24c is located. The left connection wiring 62b is recessed on the +X direction side where the data wiring terminal 24c is located.

The second wiring terminal section 14a in FIG. 10 is arranged diagonally with respect to the second panel terminal section 28. This shows a state in which the second wiring board 14 is disposed obliquely with respect to its original position in the mounting process of the second wiring board 14. At this time, the end of the data wiring terminal 24c on the −Y direction side approaches the right connection wiring 62a. The right connection wiring 62a is recessed on the data panel terminal 60 side. Therefore, even if the data wiring terminal 24c is oblique with respect to the first direction 44 and the data wiring terminal 24c approaches the right connection wiring 62a, it is possible to suppress the data wiring terminal 24c from coming into contact with the right connection wiring 62a. . Similarly, even if the data wiring terminal 24c approaches the left connection wiring 62b, it is possible to prevent the data wiring terminal 24c from coming into contact with the left connection wiring 62b. Since an unintended short circuit between the connection wiring 62a or 62b and the data wiring terminal 24c can be avoided, damage caused by short circuit current can be prevented.

Sixth Embodiment This embodiment differs from the fifth embodiment in that the connection wiring 62 shown in FIG. 10 is covered with an insulating film. Note that description of the same points as in the fifth embodiment will be omitted. FIG. 11 is a schematic plan view for explaining the positions of the wiring terminals and panel terminals of the wiring board. FIG. 12 is a schematic side cross-section of a main part for explaining the connection wiring. FIG. 12 is a cross-sectional view taken along line CC in FIG. 11. As shown in FIGS. 11 and 12, the electro-optical device 65 includes a liquid crystal panel 66 as an electro-optical panel.

In a plan view of the liquid crystal panel 66 viewed from the Z direction, the second wiring board 14 has data wiring terminals 24c disposed overlapping the data panel terminals 60. The data wiring terminal 24c protrudes from the boundary 61d as an end of the detection terminal 61 in the first direction 44.

The liquid crystal panel 66 includes an element substrate 67. On the element substrate 67, a connection wiring 68 is arranged between the detection terminal 61 and the first panel terminal 29. The connection wiring 68 electrically connects the first panel terminal 29 and the detection terminal 61. A right connection wiring 68a is arranged between the right detection terminal 61a and the first right panel terminal 29a. A left connection wiring 68b is arranged between the left detection terminal 61b and the first left panel terminal 29b. The surface of the connection wire 68 connecting the first panel terminal 29 and the detection terminal 61 is covered with an insulating film 69. The connection wiring 68 is constituted by a wiring layer that constitutes a pixel matrix and peripheral circuits on the element substrate 67. The wiring layer may be, for example, a gate wiring layer of a pixel matrix, a data line layer, a capacitance line layer, etc., which is insulated from the electrode layer of the first panel terminal 29 (for example, composed of a pixel electrode layer) with an insulating film. Bye. The material of the insulating film 69 only needs to have insulation properties, and the material of the insulating film 69 may be silicon oxide or a resin film.

The second wiring terminal section 14a in FIG. 11 is arranged diagonally with respect to the second panel terminal section 28. This shows a state in which the second wiring board 14 is disposed obliquely with respect to its original position in the mounting process of the second wiring board 14. At this time, the end of the data wiring terminal 24c on the −Y direction side approaches the right connection wiring 68a. The right connection wiring 68a is covered with an insulating film 69. Therefore, even if the data wiring terminal 24c is oblique with respect to the first direction 44 and the data wiring terminal 24c overlaps the right connection wiring 68a, it is possible to suppress the data wiring terminal 24c from coming into contact with the right connection wiring 68a. Moreover, even if the data wiring terminal 24c overlaps with the left connection wiring 68b, it is possible to suppress the data wiring terminal 24c from coming into contact with the left connection wiring 68b.

Seventh Embodiment This embodiment differs from the sixth embodiment in that there is no insulating film 69 and the second panel terminal 9 includes a dummy terminal. Note that description of the same points as in the sixth embodiment will be omitted. FIG. 13 is a schematic plan view for explaining the positions of the wiring terminals and panel terminals of the wiring board. As shown in FIG. 13, the electro-optical device 72 includes a liquid crystal panel 73 as an electro-optical panel.

As shown in FIG. 13, since the insulating film 69 is not disposed on the liquid crystal panel 73, the connection wiring 68 is exposed on the element substrate 4. In the second panel terminal section 28, the second panel terminal 58 includes a second panel terminal 59, a data panel terminal 60, and a dummy panel terminal 74 as a dummy terminal. The data panel terminal 60 is a terminal for transmitting or receiving signals. The dummy panel terminal 74 is a terminal that does not transmit or receive signals. The dummy panel terminal 74 is an independent terminal that is not electrically connected to wiring or electrical elements.

Second panel terminals 59 are arranged at both ends of the second panel terminal portion 28 . A right dummy panel terminal 74a is arranged adjacent to the second right panel terminal 59a in the -X direction. A left dummy panel terminal 74b adjacent to the second left panel terminal 59b in the +X direction is arranged. The right dummy panel terminal 74a and the left dummy panel terminal 74b are the dummy panel terminals 74. A large number of data panel terminals 60 are arranged between the right dummy panel terminal 74a and the left dummy panel terminal 74b.

A dummy panel terminal 74 is arranged between the second panel terminal 59 and the data panel terminal 60. Specifically, the right dummy panel terminal 74a is arranged between the second right panel terminal 59a and the data panel terminal 60. A left dummy panel terminal 74b is arranged between the second left panel terminal 59b and the data panel terminal 60.

In the second wiring terminal section 14a, the second wiring terminal 24 includes a second right wiring terminal 24a, a second left wiring terminal 24b, a data wiring terminal 24c, and a right dummy wiring terminal 24d and a left dummy wiring terminal 24e.

A second right wiring terminal 24a is arranged at the end of the second wiring terminal portion 14a on the +X direction side. A right dummy wiring terminal 24d is arranged next to the second right wiring terminal 24a on the −X direction side. A second left wiring terminal 24b is arranged at the end of the second wiring terminal portion 14a on the −X direction side. A left dummy wiring terminal 24e is arranged next to the second left wiring terminal 24b on the +X direction side. A large number of data wiring terminals 24c are arranged between the right dummy wiring terminal 24d and the left dummy wiring terminal 24e. In this way, when the liquid crystal panel 73 is viewed in plan from the Z direction, the second wiring board 14 has the data wiring terminals 24c arranged to overlap the data panel terminals 60.

The right dummy wiring terminal 24d is connected to the right dummy panel terminal 74a by the second anisotropic conductive film 13. The left dummy wiring terminal 24e is connected to the left dummy panel terminal 74b by the second anisotropic conductive film 13. The right dummy wiring terminal 24d and the left dummy wiring terminal 24e are terminals that do not transmit or receive signals.

The second wiring terminal portion 14a in FIG. 13 is arranged diagonally with respect to the second panel terminal portion 28. As shown in FIG. This shows a state in which the second wiring board 14 is disposed obliquely with respect to its original position in the mounting process of the second wiring board 14. At this time, the end of the right dummy wiring terminal 24d on the -Y direction side approaches the right connection wiring 68a. No electrical signal is transmitted to the right dummy wiring terminal 24d. Therefore, even if the data wiring terminal 24c is oblique with respect to the first direction 44 and the right dummy wiring terminal 24d overlaps the right connection wiring 68a, it is possible to suppress electrical effects on the right connection wiring 68a. Similarly, even if the left dummy wiring terminal 24e overlaps the left connection wiring 68b, it is possible to suppress the electrical influence on the left connection wiring 68b.

The second panel terminal 59 and the data panel terminal 60 are further apart from each other than when the dummy panel terminal 74 is not present. Therefore, even if the second wiring terminal 24 is oblique with respect to the first direction 44, electrical connection of the data wiring terminal 24c with the detection terminal 61 can be suppressed.

Eighth Embodiment In this embodiment, the electro-optical device 1, the electro-optical device 41, the electro-optical device 47, the electro-optical device 51, the electro-optical device 56, the electro-optical device 65, and the electro-optical device 72 according to the embodiments described above are used. An electronic device using either of these will be explained.

FIG. 14 is a configuration diagram showing the configuration of a projection type display device using an electro-optical device. As shown in FIG. 14, a lamp unit 82 having a white light source such as a halogen lamp is provided inside a projection display device 81 as an electronic device. Projection light emitted from the lamp unit 82 is separated into three primary colors of red, green, and blue by three mirrors 83 and two dichroic mirrors 84 arranged inside.

The projected light separated into the three primary colors is respectively guided to a red light valve 85r, a green light valve 85g, and a blue light valve 85b corresponding to each primary color. Note that blue light has a longer optical path than the other red and green lights, so in order to prevent its loss, it is guided through a relay lens system 89 having an input lens 86, a relay lens 87, and an exit lens 88.

The red light valve 85r, the green light valve 85g, and the blue light valve 85b are connected to an upper circuit within the projection display device 81. Image signals specifying the gradation levels of the primary color components of red, green, and blue are each supplied from an external upper-level circuit, processed by the upper-level circuit within the projection display device 81, and then connected to a red light valve 85r and a green light valve. 85g and blue light bulb 85b are respectively driven. Light modulated by the red light valve 85r, the green light valve 85g, and the blue light valve 85b enters the dichroic prism 91 from three directions. Then, in the dichroic prism 91, the red and blue lights are reflected at 90 degrees, and the green light is transmitted. Therefore, after the images of each primary color are combined, a color image is projected onto the screen 92 by the projection lens group 93.

The red light valve 85r, the green light valve 85g, and the blue light valve 85b include an electro-optical device 1, an electro-optical device 41, an electro-optical device 47, an electro-optical device 51, an electro-optical device 56, an electro-optical device 65, and an electro-optical device 72. Either one is used.

The electro-optical device 1 , the electro-optical device 41 , the electro-optical device 47 , the electro-optical device 51 , the electro-optical device 56 , the electro-optical device 65 , and the electro-optical device 72 are connected between the first wiring terminal 18 and the second wiring terminal 24 . Electrical resistance is tested. This makes it easy to check the continuity status between the liquid crystal panel 2, the liquid crystal panel 42, the liquid crystal panel 48, the liquid crystal panel 57, the liquid crystal panel 66, and the liquid crystal panel 73, and the second wiring terminal 24. 42. The reliability of electrical connections among the liquid crystal panel 48, liquid crystal panel 57, liquid crystal panel 66, and liquid crystal panel 73 can be improved. Therefore, the projection display device 81 includes the electro-optical device 1 and the electro-optical device 41 that can improve the reliability of electrical connections among the liquid crystal panel 2, the liquid crystal panel 42, the liquid crystal panel 48, the liquid crystal panel 57, the liquid crystal panel 66, and the liquid crystal panel 73. , an electro-optical device 47, an electro-optical device 51, an electro-optical device 56, an electro-optical device 65, and an electro-optical device 72.

An electronic device including the electro-optical device 1, the electro-optical device 41, the electro-optical device 47, the electro-optical device 51, the electro-optical device 56, the electro-optical device 65, and the electro-optical device 72 to which the present invention is applied is similar to the embodiments described above. It is not limited to the projection type display device 81. For example, it may be used in electronic devices such as projection-type head-up displays, direct-view head-mounted displays, personal computers, digital still cameras, and liquid crystal televisions.

Modification example 1
In the fourth embodiment, the widened portion 53 protrudes from the second wiring terminal 52 in the portion overlapping with the second panel terminal 31 in the +X direction and the −X direction. The widened portion 53 may protrude only in the +X direction from the portion of the second wiring terminal 52 that overlaps with the second panel terminal 31, or may protrude only in the −X direction. Further, the width of the detection terminal 49 may be the same as the width of the second panel terminal 31 like the detection terminal 32 in the first embodiment.

Contents derived from the embodiments will be described below.

The electro-optical device includes an electro-optic panel having a connection area, a first wiring board and a second wiring board connected to the connection area via an anisotropic conductive film, and the electro-optic device includes: In the connection area, a first panel terminal portion including a first panel terminal and a second panel terminal portion including a second panel terminal are arranged spaced apart from the end portion in this order, and at the connection portion of the first wiring board. A first wiring terminal provided in a certain first wiring terminal section is electrically connected to the first panel terminal, the second wiring board is arranged to overlap the first wiring board, and a connecting part of the second wiring board A second wiring terminal included in the second wiring terminal section is electrically connected to the second panel terminal, and the second panel terminal section includes a detection terminal disposed on the first panel terminal section side. , the detection terminal is electrically connected to the first panel terminal.

According to this configuration, the electro-optical device includes an electro-optic panel, a first wiring board, and a second wiring board. In the connection area of the electro-optical panel, a first panel terminal section and a second panel terminal section are arranged spaced apart in this order from the end side. The first panel terminal of the first panel terminal portion and the first wiring terminal of the first wiring terminal portion are electrically connected. A portion of the second wiring board is placed overlapping the first wiring board.

The second wiring board is connected to the second panel terminal while overlapping the first wiring board. Therefore, due to the influence of the step caused by the first wiring board, the second wiring board is susceptible to stress that causes it to peel off from the electro-optical panel. Therefore, there is a concern that the electrical connection may become unstable due to the influence of the difference in level of the first wiring board. In such a situation, when the second wiring board separates from the electro-optical panel, the second wiring terminal separates from the detection terminal before the second panel terminal.

When the second wiring terminal is in close contact with the detection terminal, the electrical resistance between the first wiring terminal and the second wiring terminal becomes low. When the second wiring terminal separates from the detection terminal, the electrical resistance between the first wiring terminal and the second wiring terminal increases.

Therefore, by inspecting the electrical resistance passing through the first wiring terminal, first panel terminal, detection terminal, and second wiring terminal, the continuity state between the electro-optical panel and the second wiring board can be easily confirmed. The connection between the optical panel and the second wiring board can be easily guaranteed. As a result, the reliability of the electrical connection of the electro-optical panel can be improved.

In the electro-optical device described above, it is preferable that the detection terminal and the first panel terminal are integrated.

According to this configuration, since the detection terminal and the first panel terminal are integrated, the pattern of the terminal can be made into a simple shape.

In the above electro-optical device, it is preferable that the length of the detection terminal in a direction perpendicular to the first direction from the second panel terminal toward the first panel terminal is longer than the second panel terminal.

According to this configuration, the length of the detection terminal is longer than the second panel terminal in the direction perpendicular to the first direction. At this time, even when the second wiring terminal is oblique with respect to the first direction, the second wiring terminal and the detection terminal tend to overlap when the electro-optical panel is viewed from above. Therefore, even when the second wiring terminal is oblique with respect to the first direction, it can be evaluated whether the second wiring terminal and the detection terminal are electrically connected.

In the electro-optical device described above, it is preferable that the second wiring terminal includes a widened portion in a portion overlapping with the detection terminal in a plan view viewed from the thickness direction of the electro-optical panel.

According to this configuration, the second wiring terminal includes a widened portion in a portion overlapping with the detection terminal. In the widened portion, the width of the second wiring terminal is increased. Even if the detection terminal is shifted to the side where the second wiring terminal is wider, the second wiring terminal and the detection terminal tend to overlap when the electro-optical panel is viewed from above. Therefore, even if the relative positions of the second wiring terminal and the detection terminal shift, it is possible to evaluate whether or not the second wiring terminal and the detection terminal are electrically connected.

In the electro-optical device described above, the second panel terminal section has a data panel terminal that transmits or receives a signal, and the second panel terminal is shorter than the data panel terminal, and the end of the detection terminal on the side opposite to the first direction is arranged closer to the second panel terminal than the end of the data panel terminal on the first direction. It is preferable that the

According to this configuration, the detection terminal is arranged near the second panel terminal in the first direction. Therefore, even if the second wiring terminal is oblique with respect to the first direction, the second wiring terminal can easily overlap the detection terminal.

In the above electro-optical device, the second wiring board has a data wiring terminal disposed overlapping with the data panel terminal in a plan view seen from the thickness direction of the electro-optical panel, and the data wiring terminal is arranged to overlap the data panel terminal. It is preferable that the first direction side protrudes from the detection terminal, and the connection wiring connecting the first panel terminal and the detection terminal is recessed on the data panel terminal side.

According to this configuration, the connection wiring is recessed on the data panel terminal side. Therefore, even if the data wiring terminal is oblique with respect to the first direction, it is possible to prevent the data wiring terminal from coming into contact with the connection wiring.

In the above electro-optical device, the second wiring board has a data wiring terminal disposed overlapping with the data panel terminal in a plan view seen from the thickness direction of the electro-optical panel, and the data wiring terminal is arranged to overlap the data panel terminal. It is preferable that a first direction side protrudes from an end of the detection terminal on the first direction side, and a surface of a connection wiring connecting the first panel terminal and the detection terminal is covered with an insulating film.

According to this configuration, the surface of the connection wiring is covered with an insulating film. Therefore, even if the data wiring terminal is oblique with respect to the first direction, it is possible to prevent the data wiring terminal from coming into contact with the connection wiring.

In the above electro-optical device, the second panel terminal portion has a data panel terminal for transmitting or receiving a signal, and in a plan view from the thickness direction of the electro-optic panel, the second wiring board is connected to the data panel terminal. It is preferable to have a data wiring terminal arranged overlapping the terminal, and a dummy terminal arranged between the second panel terminal and the data panel terminal and not transmitting or receiving a signal.

According to this configuration, the dummy terminal is arranged between the second panel terminal and the data panel terminal. The dummy terminal is a terminal that does not transmit or receive signals even if it is electrically connected to the data wiring terminal. The second panel terminal and the data panel terminal are further apart from each other than when there is no dummy terminal. Therefore, even if the data wiring terminal is oblique with respect to the first direction, it is possible to prevent the data wiring terminal from coming into contact with the detection terminal.

In the above electro-optical device, it is preferable that the second panel terminal and the detection terminal are arranged at both ends of the second panel terminal section, and the second wiring terminal is arranged at both ends of the second wiring terminal section. .

According to this configuration, the second panel terminal and the detection terminal are arranged at the terminals outside the panel drive power source or signal terminal of the second panel terminal portion. The second wiring terminal is arranged at a terminal outside the panel drive power supply or signal terminal of the second wiring terminal portion. Therefore, the conduction state of the second panel terminal portion can be easily confirmed.

An electronic device is characterized by including the electro-optical device described above.

According to this configuration, the electronic device includes the electro-optical device described above. The electro-optical device described above can easily confirm the continuity state between the electro-optic panel and the second wiring board by inspecting the electrical resistance between the first wiring terminal and the second wiring terminal. The connection between the first wiring board and the second wiring board can be easily guaranteed. As a result, the reliability of the electrical connection of the electro-optical panel can be improved. Therefore, the electronic device can be equipped with an electro-optical device that can improve the reliability of the electrical connection of the electro-optic panel.

A mounting state evaluation method includes an electro-optical device including an electro-optical panel having a connection area, a first wiring board, and a second wiring board connected to the connection area via an anisotropic conductive film, In the connection area, a first panel terminal part having a first panel terminal and a second panel terminal part having a second panel terminal are arranged spaced apart in this order from the end side, and the connection of the first wiring board A first wiring terminal included in a first wiring terminal section, which is a section, is electrically connected to the first panel terminal, and the second wiring board is arranged to overlap the first wiring board, and the second wiring board is A second wiring terminal included in a second wiring terminal section, which is a connecting section, is electrically connected to the second panel terminal, and a detection terminal disposed on the first panel terminal side is connected to the second panel terminal section. and the detection terminal detects the resistance between the first wiring terminal and the second wiring terminal in an electro-optical device electrically connected to the first panel terminal, and detects the resistance between the first wiring terminal and the second wiring terminal to connect the electro-optic panel. It is characterized by detecting whether or not the second wiring board is electrically connected.

In the electro-optical device using this method, the second wiring terminal, the detection terminal, the first panel terminal, and the first wiring terminal are electrically connected in this order. When the second wiring terminal and the detection terminal are electrically connected, the resistance between the first wiring terminal and the second wiring terminal is low. When the electrical connection between the second wiring terminal and the detection terminal is defective, the resistance between the first wiring terminal and the second wiring terminal is high.

By inspecting the electrical resistance between the first wiring terminal and the second wiring terminal, the electrical continuity between the electro-optical panel and the second wiring board can be easily confirmed. easily guaranteed. As a result, the reliability of the electrical connection of the electro-optical panel can be improved. Further, by periodically monitoring the electrical resistance between the first wiring terminal and the second wiring terminal, it is possible to predict failures of the electro-optical device and perform appropriate maintenance.

1, 41, 47, 51, 56, 65, 72... Electro-optical device, 2, 42, 48, 57, 66, 73... Liquid crystal panel as an electro-optical panel, 4a... End portion, 7... Connection area, 11... 1st anisotropic conductive film as an anisotropic conductive film, 12... first wiring board, 12a... first wiring terminal section, 13... second anisotropic conductive film as an anisotropic conductive film, 14a... th 2 wiring terminal portion, 14... second wiring board, 18... first wiring terminal, 24a... second right wiring terminal as second wiring terminal, 24b... second left wiring terminal as second wiring terminal, 24c... data Wiring terminal, 24, 52... Second wiring terminal, 27... First panel terminal portion, 28... Second panel terminal portion, 29... First panel terminal, 29a... First right panel terminal as first panel terminal, 29b ...first left panel terminal as a first panel terminal, 31,59...second panel terminal, 31a...second right panel terminal as a second panel terminal, 31b...second left panel terminal as a second panel terminal, 32...detection terminal, 34, 60...data panel terminal, 44...first direction, 53...widened portion, 60d...first end as end, 61c...second end as end, 61d...as end boundary, 62... Connection wiring, 69... Insulating film, 74... Dummy panel terminal as a dummy terminal, 81... Projection type display device as an electronic device.

Claims (12)

a first panel terminal disposed on the end side; a second panel terminal disposed apart from the first panel terminal in a first direction in which the first panel terminal extends from the end side ; The second panel terminal is arranged on the first panel terminal side of the second panel terminal arranged at the end in the first direction, and is electrically connected to the first panel terminal via the connection wiring arranged at the end in the first direction. an electro-optical panel having a detection terminal ;
a first wiring board having a first wiring terminal electrically connected to the first panel terminal via an anisotropic conductive film;
a second wiring board having a second wiring terminal electrically connected to the second panel terminal and the detection terminal via an anisotropic conductive film, and disposed overlapping the first wiring board;
including;
the electro-optical panel has a data panel terminal for transmitting or receiving signals;
In a direction opposite to the first direction from the second panel terminal toward the detection terminal, the length of the second panel terminal is shorter than the data panel terminal, and the end of the detection terminal in the first direction is An electro-optical device characterized in that the electro-optical device is disposed closer to the second panel terminal than an end of the panel terminal in a direction opposite to the first direction. The electro-optical device according to claim 1,
An electro-optical device characterized in that the detection terminal and the first panel terminal are integrated. The electro-optical device according to claim 1 or 2,
The electro-optical device is characterized in that the detection terminal has a longer length in a direction perpendicular to the first direction than the second panel terminal. The electro-optical device according to any one of claims 1 to 3,
The electro-optical device is characterized in that the second wiring terminal includes a widened portion in a portion overlapping with the detection terminal when viewed from above in the thickness direction of the electro-optical panel. The electro-optical device according to claim 1 ,
In a plan view from the thickness direction of the electro-optical panel, the second wiring board has a data wiring terminal arranged to overlap with the data panel terminal,
The data wiring terminal has a side opposite to the first direction protruding from the detection terminal,
An electro-optical device, wherein the connection wiring connecting the first panel terminal and the detection terminal is recessed on the data panel terminal side. The electro-optical device according to claim 1 ,
In a plan view from the thickness direction of the electro-optical panel, the second wiring board has a data wiring terminal arranged to overlap with the data panel terminal,
The data wiring terminal has a side opposite to the first direction protruding from an end of the detection terminal opposite to the first direction,
An electro-optical device characterized in that a surface of the connection wiring connecting the first panel terminal and the detection terminal is covered with an insulating film. a first panel terminal disposed on the end side; a second panel terminal disposed apart from the first panel terminal in a first direction in which the first panel terminal extends from the end side; The second panel terminal is arranged on the first panel terminal side of the second panel terminal arranged at the end in the first direction, and is electrically connected to the first panel terminal via the connection wiring arranged at the end in the first direction. an electro-optical panel having a detection terminal;
a first wiring board having a first wiring terminal electrically connected to the first panel terminal via an anisotropic conductive film;
a second wiring board having a second wiring terminal electrically connected to the second panel terminal and the detection terminal via an anisotropic conductive film, and disposed overlapping the first wiring board;
including;
the electro-optical panel has a data panel terminal for transmitting or receiving signals;
In a plan view from the thickness direction of the electro-optical panel, the second wiring board has a data wiring terminal arranged to overlap with the data panel terminal,
An electro-optical device comprising: a dummy terminal that is disposed between the second panel terminal and the data panel terminal and does not transmit or receive signals. a first panel terminal disposed on the end side; a second panel terminal disposed apart from the first panel terminal in a first direction in which the first panel terminal extends from the end side; The second panel terminal is arranged on the first panel terminal side of the second panel terminal arranged at the end in the first direction, and is electrically connected to the first panel terminal via the connection wiring arranged at the end in the first direction. an electro-optical panel having a detection terminal;
a first wiring board having a first wiring terminal electrically connected to the first panel terminal via an anisotropic conductive film;
a second wiring board having a second wiring terminal electrically connected to the second panel terminal and the detection terminal via an anisotropic conductive film, and disposed overlapping the first wiring board;
including;
The second panel terminal and the detection terminal are arranged at both ends of the electro-optical panel,
The electro-optical device is characterized in that the second wiring terminals are arranged at both ends of the second wiring board. An electronic device comprising the electro-optical device according to claim 1 . a first panel terminal disposed on the end side; a second panel terminal disposed apart from the first panel terminal in a first direction in which the first panel terminal extends from the end side ; The second panel terminal is arranged on the first panel terminal side of the second panel terminal arranged at the end in the first direction, and is electrically connected to the first panel terminal via the connection wiring arranged at the end in the first direction. an electro-optical panel having a detection terminal ;
a first wiring board having a first wiring terminal electrically connected to the first panel terminal via an anisotropic conductive film;
a second wiring board having a second wiring terminal electrically connected to the second panel terminal and the detection terminal via an anisotropic conductive film, and disposed overlapping the first wiring board; including;
the electro-optical panel has a data panel terminal for transmitting or receiving signals;
In a direction opposite to the first direction from the second panel terminal toward the detection terminal, the length of the second panel terminal is shorter than the data panel terminal, and the end of the detection terminal in the first direction is An electro-optical device disposed closer to the second panel terminal than an end of the panel terminal in a direction opposite to the first direction,
A mounting characterized in that resistance between the first wiring terminal and the second wiring terminal is detected to detect whether or not the electro-optical panel and the second wiring board are electrically connected. Condition evaluation method. a first panel terminal disposed on the end side; a second panel terminal disposed apart from the first panel terminal in a first direction in which the first panel terminal extends from the end side; The second panel terminal is arranged on the first panel terminal side of the second panel terminal arranged at the end in the first direction, and is electrically connected to the first panel terminal via the connection wiring arranged at the end in the first direction. an electro-optical panel having a detection terminal;
a first wiring board having a first wiring terminal electrically connected to the first panel terminal via an anisotropic conductive film;
a second wiring board having a second wiring terminal electrically connected to the second panel terminal and the detection terminal via an anisotropic conductive film, and disposed overlapping the first wiring board; including;
the electro-optical panel has a data panel terminal for transmitting or receiving signals;
In a plan view from the thickness direction of the electro-optical panel, the second wiring board has a data wiring terminal arranged to overlap with the data panel terminal,
An electro-optical device comprising a dummy terminal disposed between the second panel terminal and the data panel terminal and not transmitting or receiving signals,
A mounting characterized in that resistance between the first wiring terminal and the second wiring terminal is detected to detect whether or not the electro-optical panel and the second wiring board are electrically connected. Condition evaluation method. a first panel terminal disposed on the end side; a second panel terminal disposed apart from the first panel terminal in a first direction in which the first panel terminal extends from the end side; The second panel terminal is arranged on the first panel terminal side of the second panel terminal arranged at the end in the first direction, and is electrically connected to the first panel terminal via the connection wiring arranged at the end in the first direction. an electro-optical panel having a detection terminal;
a first wiring board having a first wiring terminal electrically connected to the first panel terminal via an anisotropic conductive film;
a second wiring board having a second wiring terminal electrically connected to the second panel terminal and the detection terminal via an anisotropic conductive film, and disposed overlapping the first wiring board; including;
The second panel terminal and the detection terminal are arranged at both ends of the electro-optical panel,
The second wiring terminal is an electro-optical device disposed at both ends of the second wiring board,
A mounting characterized in that resistance between the first wiring terminal and the second wiring terminal is detected to detect whether or not the electro-optical panel and the second wiring board are electrically connected. Condition evaluation method.

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