JP5656094B2 - Leader wiring device and image display device - Google Patents

Description

  The present invention relates to a lead wire wiring device, an image display device, and a method for manufacturing a lead wire wiring device that connect a signal line and a drive circuit.

  An image display device including a display panel such as a liquid crystal panel is provided on the market. This liquid crystal panel is a flat panel display that is thin and light and has low power consumption.

  Such a liquid crystal panel includes a display area for displaying an image provided in the center of the panel, a frame area provided in the outer peripheral area of the display area, and a terminal area provided in the outer peripheral area of the frame area.

  In the display area, a plurality of scanning lines are arranged in parallel at predetermined intervals. In addition, a plurality of data lines are arranged in parallel at predetermined intervals perpendicular to the scanning lines. In the terminal region, a plurality of external connection terminals for connecting pins (terminals) of a drive circuit that outputs an external signal are formed. A plurality of lead lines for connecting the scanning lines and data lines to the external connection terminals are formed in the frame area. A minimum area surrounded by the scanning lines and the data lines constitutes one pixel.

  With such a configuration, image display is performed by controlling the transmittance of each pixel based on external signals of the scanning line and the data line.

  In the following description, scanning lines and data lines are generically referred to as signal lines, and adjacent intervals between signal lines are referred to as signal line pitches. An external signal flowing through the signal line is referred to as a control signal.

  Further, a group of external connection terminals corresponding to the number of pins of the drive circuit is referred to as a terminal block. In this case, the plurality of external connection terminals are divided into a plurality of terminal blocks. The interval between the external connection terminals in the terminal block is described as a terminal pitch.

  Since the signal line pitch is generally larger than the terminal pitch, the leader line connects the signal line and the external connection terminal while adjusting the pitch between the signal line pitch and the terminal pitch. At this time, the length of the lead line differs depending on the positional relationship between the external signal terminal to be connected and the signal line.

  When the length of the leader line is different, the resistance value is also different. When the resistance value of the leader line is large, the transmission characteristic of the control signal transmitted from the external connection terminal to the pixel is greatly deteriorated. The transmission characteristic of the control signal causes a reduction in the image quality of the display image.

  The length of each leader line in one terminal block changes continuously. Accordingly, the resistance value of each lead line in the terminal block also changes gradually. For this reason, the image quality of the pixel controlled by the control signal from the external connection terminal in one terminal block gradually changes. Since the image quality changes gradually, the image quality deterioration is not so noticeable.

  However, the length of the leader line changes discontinuously between the terminal blocks. Therefore, the resistance value of the leader line also changes discontinuously. For this reason, the image quality changes discontinuously. Since the image quality changes discontinuously, the image quality deterioration becomes noticeable.

  In view of this, technical developments have been made to equalize the resistance values of a plurality of lead wires. For example, Japanese Patent Laid-Open No. 10-153791 (Patent Document 1) and Japanese Patent Laid-Open No. 2003-140181 (Patent Document 2) make the following proposals. That is, in Patent Document 1 and Patent Document 2, the lead wire is meandered to increase the resistance value, and the line width is changed to adjust the resistance value. Thereby, the resistance values of the plurality of lead lines are made uniform.

Japanese Patent Laid-Open No. 10-153791 JP 2003-140181 A

  However, in order to implement the measures such as meandering the leader lines disclosed in Patent Document 1 and Patent Document 2 or adjusting the resistance value by changing the line width, it is necessary to secure a corresponding space. Therefore, it may be difficult to secure this space. That is, in order to meander the leader line, a space for meandering the leader line must be secured. Further, when making the line width of the leader line thick, it is necessary to secure a space for widening the adjacent interval between the leader lines so that adjacent leader lines do not short-circuit.

  However, in an image display device in which it is desired to develop a display panel with a narrow frame area while the image display is high-definition, it is difficult to secure the space, and the resistance value of the leader line cannot be sufficiently uniformed. was there.

  SUMMARY OF THE INVENTION Accordingly, it is a primary object of the present invention to provide a lead wire wiring device, an image display device, and a method for manufacturing a lead wire wiring device that have solved the above problems.

  In order to solve the above problems, the lead wire wiring device includes an insulating layer that is electrically insulated and a connection portion that is provided through the insulating layer. In addition, an external connection terminal formed on one surface of the insulating layer and a lead wire formed on the other surface of the insulating layer are provided. And an external connection terminal and a leader line are connected by a connection part. One end of the lead wire is connected to a conductor. Further, the other end of the lead wire is connected to the external connection terminal by the connection portion at a position away from the first end on the conductor side in the external connection terminal by a predetermined distance.

  Since one end portion of the lead wire is connected to the external connection terminal by the connection portion at a position away from the conductor-side end portion of the external connection terminal, the adjustment range of the lead wire resistance value can be expanded. Therefore, the resistance value of the leader line can be made uniform.

It is a top view of the liquid crystal panel applied to consideration of related technology. It is a top view which shows a terminal area | region and a frame area | region in case the leader line applied to consideration of related technology is arrange | positioned symmetrically with respect to the center axis line of a terminal block. It is a top view which shows a terminal area | region and a frame area | region in case the leader line applied to consideration of related technology is arrange | positioned asymmetrically with respect to the center axis line of a terminal block. It is a figure which shows the structure where the leader line applied to consideration of related technology meandered. It is a fragmentary sectional view of the display panel containing the external connection terminal applied to consideration of related technology. It is sectional drawing containing the external connection terminal in the leader wiring apparatus applied to description of 1st Embodiment. It is a partial top view of the terminal area | region and frame area | region in the leader line wiring apparatus applied to description of 2nd Embodiment. It is sectional drawing along the BB line in FIG. It is the fragmentary top view which expanded the external connection terminal in the leader wiring apparatus applied to description of 2nd Embodiment. It is a flowchart which shows the manufacturing method of the leader line wiring apparatus applied to description of 2nd Embodiment. It is a figure explaining the meander part of the leader line applied to description of 2nd Embodiment. It is the figure which compared the resistance value distribution of the leader line in one terminal block in the leader line wiring apparatus of 2nd Embodiment, and the leader line wiring apparatus concerning related technology. It is a top view which shows the leader line wiring apparatus applied to description of 3rd Embodiment. It is a figure which shows the result of having measured the resistance value distribution of the leader line in the leader wiring apparatus concerning 3rd Embodiment and related technology. It is a top view of the external connection terminal in the leader wiring apparatus applied to description of 4th Embodiment, and is a figure at the time of forming each contact hole in the edge part vicinity of the external connection terminal far from a frame area | region. It is a top view of the external connection terminal in the leader wiring apparatus applied to description of 4th Embodiment, and is a figure at the time of forming each contact hole in the edge part vicinity of the external connection terminal near a frame area | region. It is a top view of the external connection terminal in the leader wiring apparatus applied to description of 4th Embodiment, and is a figure at the time of forming so that each contact hole may be disperse | distributed to the whole area | region of an external connection terminal. It is a perspective view which shows the structure of the liquid crystal display device applied to description of 5th Embodiment.

  First, consider related technologies. FIG. 1 shows a top view of a general liquid crystal panel 2. The liquid crystal panel 2 includes a display area 4, a frame area 6, and a terminal area 8. The display area 4 includes signal lines 10 such as a plurality of scanning lines 10a and a plurality of data lines 10b. The scanning line 10a and the data line 10b are orthogonal to each other in a chained state.

  A plurality of external connection terminals 12 are formed in the terminal region 8. The external connection terminal 12 is blocked as one terminal block 13 for each drive circuit (not shown). In the frame area 6, a plurality of lead lines 16 that connect the signal line 10 and the external connection terminal 12 are formed. Note that in each drawing shown below, a part of a signal line, an external connection terminal, a signal line, and the like is omitted as appropriate for simplification of the drawing.

  2 and 3 are top views of the terminal region 8 and the frame region 6. In addition, as shown in FIG.2 and FIG.3 etc., the terminal block 13 is rectangular shape. Therefore, when the line that passes through the center of the side of the display block 4 and passes through the center of the side of the display area 4 and goes from the terminal area 8 to the display area 4 is the central axis, the terminal block 13 is drawn with respect to the central axis. Line 16 is arranged symmetrically or asymmetrically. FIG. 2 shows a case where the lead lines 16 are arranged symmetrically with respect to the central axis. FIG. 3 shows a case where the leader line 16 is disposed asymmetrically with respect to the central axis.

  Such lead lines 16, external connection terminals 12, signal lines 10, and the like are formed using a photolithography method. Therefore, in order to make the resistance value distribution of the plurality of lead lines 16 uniform, while satisfying process conditions such as resolution in the photolithography method (for example, the minimum adjacent interval of the lead lines 16), the line length and line of the lead lines 16 are increased. The width is set.

  For example, the resistance of the leader line 16 can be reduced by increasing the line width of the leader line 16 having a long line length. Further, the leader line 16 having a short line length can be made highly resistive by reducing the line width. As a result, the difference between the resistance value of the long lead wire 16 and the resistance value of the short lead wire 16 is reduced.

  2 and 3 are enlarged views of the boundary portion between the terminal region 8 and the frame region 6, and the enlarged view C is an enlarged view of the boundary portion between the display region 4 and the frame region 6. In this specification, as shown in FIGS. 2 and 3, the acute angle formed by the line K parallel to the longitudinal direction of the terminal region 8 and the lead line 16 is defined as a lead angle α.

  When the lead angle α is defined as described above, the lead angle α of the lead line 16 is different for each lead line 16. When the lead angle α decreases, the adjacent interval S between the lead lines 16 also decreases. The minimum value of the adjacent interval S is determined by process conditions such as resolution in the photolithography method described above. Therefore, the line width W of the leader line 16 can only be increased within this process condition.

  Since there is an upper limit in the line width of the leader line, and it is difficult to make the resistance value distribution of each leader line uniform while satisfying this upper limit, Patent Document 2 meanders the leader line 16 as shown in FIG. We propose a configuration to let you. In the configuration shown in FIG. 4, the leader line 16 a having a long linear distance L between the external connection terminal 12 and the signal line 10 has a large line width. In addition, the leader line 16b having a short line length L between the external connection terminal 12 and the signal line 10 has a narrow line width and meanders 20. Therefore, in order to meander the leader line, a corresponding space is required.

  In recent years, development of a high-definition liquid crystal panel in which the number of pixels is increased without changing the size of the display area 4 or the frame area 6 is narrowed has progressed. As the number of pixels increases, the number of leader lines also increases. Also, coupled with the technological development of such a high-definition liquid crystal panel, the number of pins of the drive circuit is increasing (the number of pins is increased).

  Therefore, the pitch difference between the signal line pitch and the terminal pitch becomes large, and it becomes difficult to increase the line width of the leader line. In addition, since a large number of lead wirings must be formed in a narrow frame region, it is difficult to secure a space for meandering the lead lines.

  The lead wire wiring device for the display panel comprising the external connection terminals 12 and the lead wires 16 will be discussed in more detail with reference to FIG. FIG. 5 is a partial cross-sectional view of the display panel including the external connection terminals 12.

  An insulating layer 24 is formed on the glass substrate 22, and a lead wire 16 is formed on the insulating layer 24. Further, a pattern 12 a made of ITO (Indium Tin Oxide) or the like is formed on the lead line 16. The external connection terminal 12 is an area where the pattern 12a and the leader line 16 overlap.

  In such a configuration, the inventor of the present application has found that a leader line can be formed in a place that has not been used so far (for example, between the glass substrate 22 and the insulating layer 24).

  Next, a first embodiment of the present invention made based on the above consideration will be described. FIG. 6 is a partial cross-sectional view of the lead wire wiring device according to the present embodiment.

  The lead wire wiring device 30 includes an external connection terminal 28, an insulating layer 24, a lead wire 26, and a connection portion (contact hole) 32. The external connection terminal 28 is an electric conductor terminal to which an external signal (control signal) is input. The insulating layer 24 is made of an electrical insulator. The lead wire 26 is made of an electric conductor. The contact hole 32 is formed so as to penetrate the insulating layer 24.

  The insulating layer 24 electrically insulates the external connection terminal 28 and the lead wire 26 from each other. In addition, one end portion of the lead wire 26 is connected to the conductor 27, and the other end portion is connected to the external connection terminal 28 through a contact hole 32 formed in the insulating layer 24.

  With the above configuration, the lead wire 26 can be made longer by the distance from the first end portion on the conductor 27 side of the external connection terminal 28 to the contact hole 32. Therefore, the adjustment range of the resistance value of the lead line 26 can be expanded. Therefore, the resistance value distribution of the lead line 26 is made highly uniform.

  Next, a second embodiment of the present invention will be described. In addition, about the same structure as the said embodiment, description is abbreviate | omitted suitably using the same code | symbol.

  FIG. 7 is a partial top view of the terminal region 8 and the frame region 6 in the lead wire wiring device according to the present embodiment. 8 is a cross-sectional view taken along line BB in FIG. FIG. 9 is an enlarged partial top view of the external connection terminal 28.

  The lead wire wiring device 30 includes an external connection terminal 28 and a lead wire 26 provided with the insulating layer 24 interposed therebetween. Note that a contact hole (connection portion) 32 is formed in the insulating layer 24. The lead line 26 is formed between the glass substrate 22 and the insulating layer 24.

  The insulating layer 24 is a film that electrically isolates the external connection terminal 28 and the lead wire 26, and examples thereof include silicon dioxide and silicon nitride. The lead line 26 is a single layer or a multilayer film containing chromeum, molybdenum, aluminum or the like as a material. The external connection terminal 28 is a laminated body of a metal pattern 28a containing chromium, molybdenum, aluminum, or the like as a material and a pattern 28b such as ITO.

  A method of manufacturing such a lead wire wiring device 30 will be described with reference to FIG. First, a metal film containing chromium, molybdenum, aluminum or the like as a material is formed on the glass substrate 22 using a sputtering method or the like. Thereafter, the lead film 26 is formed by patterning the metal film using a photolithography method (step St1).

  Next, an insulating layer 24 is formed by depositing silicon dioxide or silicon nitride on the lead line 26 using a CVD (Chemical Vapor Deposition) method or the like (step St2). Thereafter, the contact hole 32 is formed in the insulating layer 24 using an etching technique (step St3).

  After the contact hole 32 is formed, a metal film containing chromium, molybdenum, aluminum or the like as a material is formed, and an ITO film is formed thereon. Then, the external connection terminal 28 is formed by patterning the metal film and the ITO film using a photolithography method (step St4).

  The external connection terminal 28 and the lead wire 26 thus formed are electrically connected at the position of the contact hole 32 as shown in FIG. This contact hole 32 is formed in the vicinity of the end portion (second end portion) of the external connection terminal 28 on the outer edge end 34 side. That is, the contact hole 32 is formed at a position away from the second end of the external connection terminal 28 by a predetermined distance. The long line length of the lead line 26 is formed wide, and the short line length of the lead line 26 is narrow.

  Since the contact hole 32 is formed at a position a predetermined distance away from the second end of the external connection terminal 28 farthest from the display area 4, the lead line 26 is substantially equivalent to the width of the terminal area 8. Can be long. In other words, the adjustment range of the resistance value of the lead line 26 can be expanded only by the terminal region 8.

  That is, the general width of the frame region 6 is about 2 to 5 mm, and the length of the external connection terminal 28 is about 1.5 to 3 mm. Therefore, the frame area 6 according to this embodiment can be substantially expanded by about 1.5 to 3 mm.

  As shown in FIG. 7, the lead lines 26 in the terminal region 8 are provided in parallel with each other and along the external connection terminals 28. Specifically, each lead line 26 from the terminal region 8 is parallel and drawn in parallel to the external connection terminal 28, and then extends in the direction of the signal line 10 at a predetermined lead angle. For this reason, the adjacent space | interval of the leader line 26 in the terminal area | region 8 becomes the largest. Therefore, it is possible to set the line width of the leader line 26 in the terminal region 8 to a wide width.

  In order to suppress variations in the transmission characteristics of the control signal, it is preferable that the resistance value distribution of each lead line is uniform. In addition, it is preferable that the resistance value of each lead wire is low in order to suppress the deterioration amount of the transmission characteristic of the control signal. When the lead wire is connected to the external connection terminal in the terminal region 8, the resistance value over the entire length of the lead wire 26 is increased due to the resistance value of the lead wire 26 in the terminal region 8.

  In such a case, the line width W1 of the leader line 26 in the terminal area 8 is set to be thicker than the line width W2 of the frame area 6, as shown in the enlarged view G of FIG. That is, the line width of the leader line 26 is changed from the middle. An enlarged view G of FIG. 7 is a top view of the leader line 26 having a long line length in the frame region 6 and the terminal region 8. Thereby, it can suppress that the resistance value of the leader line 26 becomes high, achieving sufficient equalization of the resistance value of each leader line.

  In the above description, the leader line 26 is straight and does not meander, but the present embodiment does not exclude the arrangement that meanders the leader line 26. That is, as shown in FIG. 11, when it is desired to increase the resistance value of the lead line 26, a meandering portion 39 is provided on the lead line 26 to increase the line length. The number of times of meandering can be appropriately set according to the resistance value to be adjusted.

  FIG. 12 is a diagram comparing the resistance distributions of the leader lines in one terminal block in the leader line wiring apparatus having the above configuration and the leader line wiring apparatus according to the related art. The mark ○ indicates the resistance value of the lead wire of the lead wire wiring device according to the present embodiment, and the mark ■ indicates the resistance value of the lead wire of the lead wire wiring device according to the related art. The horizontal axis indicates the pin number of the external connection terminal in the terminal block, and the vertical axis indicates the resistance value of the lead wire connected to the external connection terminal of that number.

  In the case of the lead wire wiring device according to the related art, the resistance value greatly fluctuates. This indicates that even if the leader line is meandered or the line width is adjusted, the resistance value cannot be sufficiently uniformed due to the limitation of the adjustment space. On the other hand, in the lead wire wiring device according to the present embodiment, fluctuations in the resistance value are suppressed. This indicates that by extending the lead wire to the position of the contact hole in the terminal region, the resistance adjustment space is widened and the resistance value can be sufficiently uniformed.

  Therefore, it is possible to provide a lead wire wiring device in which the lead wire resistance value distribution is made highly uniform without changing the basic specifications such as the dimensions of the liquid crystal panel. Therefore, it is possible to provide a high-quality image display device using such a leader line wiring device.

  Moreover, since the frame area is substantially expanded to the terminal area, the width of the terminal area can be reduced. Therefore, even if the glass substrate has the same dimensions, it is possible to enlarge the display area by the width of the terminal area. Conversely, even if the display area is the same, a display panel with a small glass substrate size can be manufactured.

  Next, a third embodiment of the present invention will be described. In addition, about the same structure as the said embodiment, description is abbreviate | omitted suitably using the same code | symbol.

  The leader line wiring device concerning an embodiment is related with the composition which formed the leader line in the shape of a straight line. This will be described with reference to FIG. FIG. 13 is a top view showing the lead wire wiring device according to the present embodiment.

  The lead line 26 and the external connection terminal 28 are separated by an insulating layer and are connected by a contact hole 32. The lead line 26 is formed in a substantially straight line from the contact hole 32 to the signal line 10.

  Since the leader line 26 is formed linearly, the length of the leader line 26 is shortened. By shortening the lead line 26, the resistance value of the lead line becomes small. Therefore, it is possible to reduce the average resistance value of each lead line while making the resistance value distribution of each lead line uniform. As described above, when the resistance value is small, the deterioration of the transmission characteristic in the control signal is also small. Therefore, it is possible to realize a display panel with uniform image quality while suppressing deterioration in image quality of the display image.

  FIG. 14 is a diagram illustrating a result of measuring a resistance value distribution of the leader line in the leader line wiring device according to the present embodiment and related technology. The mark ○ indicates the resistance value of the lead wire of the lead wire wiring device according to the present embodiment, and the mark ■ indicates the resistance value of the lead wire of the lead wire wiring device according to the related art. The horizontal axis indicates the pin number of the external connection terminal in the terminal block, and the vertical axis indicates the resistance value of the lead wire connected to the external connection terminal of that number. Measurements are made on the lead wires connected to two adjacent terminal blocks.

  The resistance value distribution of the leader line in the leader line wiring apparatus according to the related art varies greatly. However, the fluctuation range of the resistance value distribution of the leader line in the leader line device according to the present embodiment is small. This indicates that the resistance value distribution of the leader line 26 in each terminal block 13 is uniform. Further, it is shown that the resistance value distribution of the lead line 26 between the terminal blocks 13 is made uniform. Therefore, the effect of the present invention could be verified.

  As described above, it is possible to provide a lead wire wiring device that suppresses an increase in the lead wire resistance value and makes the lead wire resistance value distribution highly uniform without changing the basic specifications such as the dimensions of the liquid crystal panel. Become. Therefore, it is possible to provide a high-quality image display device using such a leader line wiring device.

  Next, a fourth embodiment of the present invention will be described. In addition, about the same structure as the said embodiment, description is abbreviate | omitted suitably using the same code | symbol.

  In each of the embodiments described so far, the contact hole is formed at a predetermined distance from the vicinity of the outer edge of the external connection terminal farthest from the display area. For example, in the configuration shown in FIG. 13, the length of the leader line on the upper and lower block end sides of the terminal block 13 is longer than the length of the leader line on the block center side. On the other hand, in the present embodiment, the formation position of the contact hole is changed in accordance with the resistance value of the leader line.

  15 to 17 are top views of the external connection terminals 28 in the lead wire wiring device according to the present embodiment. FIG. 15 illustrates the case where each contact hole 32 is formed in the vicinity of the end portion of the external connection terminal 28 that is far from the frame region 6. FIG. 16 illustrates a case where each contact hole 32 is formed in the vicinity of the end portion of the external connection terminal 28 and close to the frame region 6. Further, FIG. 17 illustrates a case where the contact holes 32 are formed so as to be distributed over the entire region of the external connection terminals 28.

As long as the contact hole 32 is formed within the terminal region of the external connection terminal 28, the process is not limited. Therefore, as shown in FIGS. 15 to 17, the contact holes 32 are formed so that the lengths of the lead lines 26 are substantially the same, that is, the resistance values of the lead lines 26 are made uniform. The position has been adjusted.
In FIG. 15 to FIG. 17, the contact hole 32 connected to the leader line 32 a on the block end side where the line length becomes longer is formed at a position close to the frame region 6. In addition, the contact hole 32 connected to the lead line 32 b on the block center end side with a short line length is formed at a position away from the frame region 6. By adjusting the formation position of the contact hole 32 in this way, the resistance value of each lead line 26 can be made uniform.

  In addition to the case where the lead wire is formed symmetrically with respect to the central axis of the terminal block as shown in FIGS. 15 to 17, the lead wire is asymmetric with respect to the central axis of the terminal block as shown in FIG. Sometimes formed. In any case, the position of the contact hole 32 is adjusted so that the lengths of the lead lines 26 are substantially the same. This makes it possible to make the resistance value distribution of each leader line highly uniform.

  As described above, it is possible to provide a lead wire wiring device in which the lead wire resistance value distribution is made highly uniform without changing the basic specifications such as the dimensions of the liquid crystal panel. Therefore, it is possible to provide a high-quality image display device using such a leader line wiring device.

  Next, a fifth embodiment of the present invention will be described. In addition, about the same structure as the said embodiment, description is abbreviate | omitted suitably using the same code | symbol.

  In the present embodiment, the lead wire wiring device according to each of the embodiments described so far is applied to an image display device. Examples of the image display device include a liquid crystal display device, a plasma display device, and an organic EL display device. The liquid crystal display device will be described below.

  As shown in FIG. 18, the liquid crystal display device 50 includes a liquid crystal panel 51 and a backlight 52 as main components. The liquid crystal panel 51 includes a display area 4 for displaying an image at the center of the panel, a frame area 6 provided around the display area 4, and a terminal area 8 provided around the frame area 6. A plurality of drive circuits 53 are provided in the terminal region 8, and the terminals of the drive circuits 53 are connected to the external connection terminals 28.

  In the display area 4, a plurality of scanning lines 10a are provided in parallel at predetermined intervals. In addition, a plurality of data lines 10b are provided at predetermined intervals and in parallel to the scanning line 10a. A region surrounded by two adjacent scanning lines 10 a and two adjacent data lines 10 b forms one pixel 56.

  A control signal from the drive circuit 53 is supplied to the signal line 10 such as the scanning line 10 a and the data line 10 b through the external connection terminal 28 and the lead line 26 and applied to each pixel 56. Based on this control signal, the transmittance of each pixel 56 is controlled.

  The backlight 52 emits light toward the liquid crystal panel 51. Since the transmittance of the pixel 56 is controlled, the light from the backlight 52 is transmitted through the liquid crystal panel 51 in accordance with the transmittance of the pixel 56. As a result, image display is performed.

  The signal line 10 of the liquid crystal panel 51 is connected to the external connection terminal 28 by the lead line 26, and each lead line 26 is provided to extend to the terminal region 8 so that the resistance value distribution is made uniform. Therefore, a high-quality display without luminance unevenness can be realized.

2 Liquid crystal panel 4 Display area 6 Frame area 8 Terminal area 10 Signal line 13 Terminal block 22 Glass substrate 24 Insulating layer 26 Lead line 28 External connection terminal 30 Lead line wiring device 32 Contact hole (connection part)
39 Meandering portion 50 Liquid crystal display device 51 Liquid crystal panel 52 Backlight 53 Drive circuit 56 Pixel

Claims (3)

A plurality of lead wire wiring devices;
A signal line connected to the lead line in each of the lead line wiring devices, and an external electrode terminal provided for supplying a signal from the outside in the lead line wiring device to the display panel via the signal line A display panel having pixels whose image display is controlled by an external signal input from a connection terminal;
A drive circuit for outputting the external signal to the external connection terminal;
The display panel includes a display area for displaying an image, a frame area in which the leader line is formed in an outer peripheral area of the display area, and a terminal area in which the external connection terminal is formed in an outer peripheral area of the frame area. And
The lead wire extends from the frame region to the terminal region, and is connected to a connection portion in the external connection terminal formed in the terminal region, and each lead wire wiring device is an insulating layer that electrically insulates And the connecting portion provided through the insulating layer,
The external connection terminal formed on one surface of the insulating layer, and the lead wire formed on the other surface of the insulating layer,
The external connection terminal and the lead wire are connected by the connection portion, and one end portion of the lead wire is connected to a conductor, and the other end portion of the lead wire is connected to the external connection terminal. Connected to the external connection terminal by the connecting portion at a position away from the first end on the conductor side by a predetermined distance;
The connection portion is formed at a position away from the second end portion of the external connection terminal on the side opposite to the first end portion by a predetermined distance;
The leader line is formed in a substantially linear shape, and is set to have different width dimensions in the terminal area and the frame area,
The external connection terminal is at least partially overlapped with the lead line across the insulating layer in the terminal region of the display panel;
The lead wire formed on a surface different from the surface on which the external connection terminal of the insulating layer is formed in the terminal region from the boundary between the terminal region and the frame region to the connection portion. Since the length of the lead wire becomes longer, the resistance value of the lead wire can be adjusted corresponding to the length,
An image display device characterized in that a difference in resistance between leaders having different lengths can be reduced by changing a width of the leader .   The at least part of the plurality of connection portions is formed at a position shifted from each other between the first end portion and the second end portion of the external connection terminal. The image display device described in 1. The image display device according to claim 1, wherein the lead wire of each of the lead wire wiring devices is disposed between the insulating layer and the transparent substrate.

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