JP2007518120A - Electronic device having a bent wiring pattern - Google Patents

Abstract

Provided are a bent wiring pattern form capable of making wiring resistance values as equal as possible with a simple structure, and an electronic device based thereon. It has a substrate 100 on which a plurality of conductive lines 10 having a pattern extending linearly from a predetermined starting end 1 s and then sequentially bending in approximately the same direction at predetermined intervals P and extending to predetermined connection destinations 30 are formed. Electronic equipment. The conductive wire 10 exhibits a change in line width in the linear extending portion 10L so that the resistance values in at least the linear extending portion 10L of the conductive wire 10 are equal to each other. The line width is formed larger than the line width at the far position.

Description

  The present invention relates to an electronic device having a bent wiring pattern, and more particularly to an electronic device having a large number of conductive lines exhibiting a bent wiring pattern suitable for a display panel or the like.

  2. Description of the Related Art Conventionally, there has been known an electronic board on which a plurality of wirings having a pattern extending in a straight line from a starting end and then sequentially bending and extending to respective connection destinations are formed (for example, see Patent Document 1). .

  In Patent Document 1, the wiring width of the first wiring portion in the horizontal direction of the data electrode or the scanning electrode is made larger than the wiring width of the second wiring portion in the vertical direction of the same electrode. The pattern resistance value is reduced. As a result, the difference in pattern resistance value due to the difference in the wiring length of the electrode is reduced, and the luminance unevenness is reduced (paragraph numbers [0022] and [0024]).

  This document also discloses that a correction resistor is interposed between the electrode terminal and the electrode driver in order to correct a difference in pattern resistance value due to a difference in the wiring length of the data electrode or the scan electrode. Set the resistance value of the correction resistor so that the sum of the value and the pattern resistance value of the electrode to which the correction resistor is connected is equal, correct the difference in the pattern resistance value due to the difference in the electrode wiring length, A mode of reducing the number has also been proposed (paragraph numbers [0022], [0023], [0025] and [0026]).

However, in the former form, by simply increasing the width of the horizontal wiring portion compared to the vertical wiring portion, the resistance value is uniformly reduced for all the electrodes, thereby varying the resistance value of these electrodes. This is not enough to make the resistance value of each electrode equal. In the latter form, a correction resistor having an appropriate resistance value must be separately provided for each electrode between the electrode terminal and the corresponding driver, which complicates the structure and reduces the number of components. It is also disadvantageous in the manufacturing process.
JP-A-10-63198

  An object of the present invention is to provide a bent wiring pattern configuration and an electronic device based thereon that can make wiring resistance values as equal as possible with a simple structure.

  Another object of the present invention is an electronic device having a large number of conductive lines exhibiting a bent wiring pattern particularly suitable for a display panel, etc., and having a simple structure and having a wiring resistance value equivalent to each other. It is an object of the present invention to provide an electronic device that adopts a wiring pattern form for the conductive line and can equalize the delay, amplitude, and other qualities of signals transmitted by the conductive line.

  In order to achieve these objects, an electronic device according to an aspect of the present invention is a pattern that extends linearly from a predetermined start end and then bends in substantially the same direction at predetermined intervals and extends to a predetermined connection destination. An electronic device having a substrate on which a plurality of conductive lines having a plurality of conductive lines is formed, wherein the conductive lines have linear extension portions so that respective resistance values in at least the linear extension portions of the conductive lines are equal. In the electronic device, the line width is changed, and the line width near the bending point is formed larger than the line width far away.

  According to this aspect, since the resistance values are made equal based on the change in the line width of the main linearly extending portion of the conductive wire, the wiring resistance values can be made as equal as possible with a simple structure. Can do. Thereby, the delay, amplitude, and other qualities of the signal transmitted through the conductive line can be made uniform.

  In this aspect, the starting end of the conductive wire may be connected to an input / output end of a driving circuit or a peripheral circuit of the electronic device. Thus, the resistance of the linearly extending portion of the conductive line from the input / output end of the drive circuit or the peripheral circuit is made uniform.

  Further, the connection destination of the conductive wire may be a plurality of lines extending substantially in parallel with each other at a predetermined interval, and the bending angle may be a substantially right angle. By doing in this way, the effect peculiar to this invention can be exhibited without regret.

  The linear portion further includes a plurality of bus lines extending in parallel to each other at a predetermined interval from the position of the one side to the position of the other side in a display area defined by at least one side and the other side facing each other. Are preferably arranged in a region outside the display region adjacent to at least one of the one side and the other side. According to this, in a region other than the display region on the substrate, a region suitable for the arrangement of the conductive lines having the bent pattern according to the present invention can be defined.

  Here, if the bus line is a row electrode line, a gate electrode line, a column electrode line or a source electrode line, a more preferable embodiment can be obtained.

  The display area is also defined by third and fourth sides facing each other, which are formed substantially perpendicular to the one side and the other side, and the driving circuit or the peripheral circuit includes the third and fourth sides. An area suitable for the arrangement of the conductive lines having the bent pattern according to the present invention and an area suitable for the arrangement of the driving circuit or the peripheral circuit by being provided in an area outside the display area adjacent to at least one of Can be defined.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on examples with reference to the accompanying drawings.

  FIG. 1 is an external plan view of a substrate used in an electronic device according to an embodiment of the present invention.

  The substrate 100 in this example is a liquid crystal display panel, and the liquid crystal display panel performs a display function unit 1A in which a display region 1d is demarcated at the center thereof, driving each pixel in the display region 1d, and other operations. Drive circuit (or peripheral circuit) 20 and a drive function unit 1B provided adjacent to the display function unit 1A.

  In the display function unit 1A, a plurality of conductive lines 10 are formed on the side of the display region 1d. The conductive wire 10 extends linearly (upward in the figure) from a predetermined start end 1s on the drive function unit 1B side, and then extends in substantially the same direction (rightward or leftward in the figure) at every predetermined interval P. ) It has a pattern that bends sequentially and extends to a predetermined connection destination on the display area 1d side. The starting end 1s of the conductive line 10 is connected to the input / output terminal of the drive circuit 20 in the drive function unit 1B. The connection destination of the conductive lines 10 is a plurality of bus lines 30 extending in parallel with each other at a predetermined interval in the display region 1d.

  The bus line 30 serves as a row electrode line in the display region 1d, and has a rectangular display region 1d having one side (first side) 1d1 and the other side (second side) 1d2 facing each other on the left and right in the drawing. It extends in parallel to each other at a predetermined interval from the position of the one side to the position of the other side. Another bus line 31 is formed crossing the bus line 30. The bus line 31 bears a column electrode line in the display region 1d, is formed substantially perpendicular to the first side 1d1 and the second side 1d2, and is opposite to the third side of the rectangular display region in the vertical direction of the figure. 1d3 and the fourth side 1d4 extend in parallel from each other at a predetermined interval from one position to the other.

  In this example, an active driving method using a thin film transistor (TFT) as a pixel driving element is adopted, and the bus lines 30 and 31 are respectively a gate electrode line and a source electrode line, and generally at the intersection of the bus lines 30 and 31. Correspondingly, TFTs are formed. The details of the configuration and operation of the display area based on the active drive method are left to various known documents and are omitted here.

  The linear portions of the conductive lines 10 are arranged in a region outside the display region 1d adjacent to the first side 1d1 and the second side 1d2 of the display region 1d. As shown in the figure, in the conductive wires 10 arranged, the linear portions are longer as the outer conductive wires are arranged. Further, the conductive line on the inner side (that is, near the display area 1d) is connected to the bus line 30 on the side closer to the drive circuit 20 (or the drive function unit 1B). It is connected to the bus line 30 on the side far from the drive function unit 1B).

  The conductive line 11 connected to the bus line 31 does not have such a bending pattern peculiar to the conductive line 10, and the input / output end of the drive circuit 21 and the bus line 31 in the drive function unit 1B are as much as possible. Connect with the shortest distance.

  As can be seen from FIG. 1, the drive circuits 20 and 21 are formed in the area outside the display area 1d adjacent to the fourth side 1d4 of the display area 1d, that is, the area of the drive function unit 1B in this example. Yes. In this way, by forming a circuit necessary for the liquid crystal display panel 100 only in the region on one side constituting the planar outline of the liquid crystal display panel 100, the display region 1d can be efficiently formed. Also, depending on the electronic device to be applied, such a configuration in which the drive circuit is arranged only on one side may be extremely advantageous.

  Further, in this example, the drive circuit 20 is arranged separately on both the left and right sides of the drive function unit 1B. Then, the conductive lines 10 connected thereto are routed from the neighboring areas of the first side 1d1 and the second side 1d2 of the display area 1d to the display area, and the conductive lines 10 are alternately connected to the bus lines 30 on the left and right. I try to do it. That is, in the arrangement direction above and below the bus line 30, the conductive line 10 is connected to one bus line 30 in the vicinity of one of the first and second sides 1 d 1 and 1 d 2. The conductive wire 10 in the other nearby region is connected. As a result, the interval P between the bending points of the conductive line 10 can be made twice the interval between the bus lines 30, which is advantageous for pattern formation of the conductive line 10.

  In the present embodiment, the conductive line 10 having the bent pattern as described above is connected to the bus line 30 serving as the row electrode, and the conductive line 10 is formed in the manner described below, whereby the drive circuit 20 is formed. The resistances of the conductive lines from the output of the current to the input of the bus line 30 are made as equal as possible.

  The display function unit 1A and the drive function unit 1B may be formed of different substrate assemblies or the same substrate assembly. In the case of different substrate assemblies, the end of the conductive wire is exposed on one of the two opposing substrates (display function unit 1A) that sandwich the liquid crystal medium, and a film such as a TAB film is exposed on the exposed end. There is a method in which a conductive wire from the drive circuit 20 formed on the substrate (drive function unit 1B) is coupled by ACF (anisotropic conductive film) or the like. In the case of the same substrate assembly, the two opposing substrates that sandwich the liquid crystal medium include the display function unit 1A, and a region in which the end of the conductive line is formed on one of the substrates (drive function unit 1B). And a drive circuit 20 connected to the end of the region is mounted or formed in this region.

  FIG. 2 is an enlarged view of a part of the conductive wire 10 in order to explain a detailed formation mode of the conductive wire 10.

  In FIG. 2, an enlarged shape in the vicinity of the bending point of the conductive wire 10 shown in FIG. 1 is shown as a representative showing its formation mode. In the present example, the outermost conductive line 101 has a shape in which the outer edge of the linearly extending portion 10L is a straight line and the inner edge has a step at every predetermined interval P. Such a shape satisfies the condition that the line width near the bending point Q is formed larger than the line width at the far position, and in this example, at each predetermined interval P (or other conductive line bending point). Each time Q appears, the width of the linearly extending portion 10L of the conductive wire 101 is changed, and the width is constant in the section.

  Similarly, the other conductive lines 102, 103,... Have a shape that satisfies the condition that the line width at the position near the bending point Q is larger than the line width at the far position, and is formed at every predetermined interval P (or Each time a bending point Q of another conductive line appears), the width of the linearly extending portion 10L of the conductive line 101 changes. However, the linear outer edges of the conductive lines 102, 103,... Are different from the conductive lines 101 in which the outer edges extend along the direction perpendicular to the arrangement direction of the conductive lines 10 (the horizontal direction in the figure). The stepwise edges of adjacent conductive lines on the outside extend generally along a direction parallel to a straight line connecting the corners forming the step.

  These conductive wires 101, 102, 103,... Have at least the same resistance value in the linearly extending portion 10L, preferably the total resistance values in the linearly extending portion 10L and the extended portion 10T after bending. In addition, the linear extending portion 10L has a change in line width, and the line width near the bending point Q is formed larger than the line width at the far position. In order to obtain such an equal resistance value, the average value of the line width of the linearly extending portion 10L of the outer conductive line is generally made larger than that of the inner one.

  In the present embodiment, the outer conductive wire 10 having a long routing distance exhibits a pattern in which the width is increased as the position is closer to the bending point Q. Such a pattern has a predetermined shape after extending linearly from the starting end. This is advantageous for conductive wires that bend sequentially in the same direction at intervals. That is, in the region where the conductive lines are arranged, a space for drawing the bent conductive line is vacant, so that the empty space can be used to increase the width of another conductive line that is bent farther than the conductive line. It is possible and convenient.

  In addition, although the average value of the line width of the linearly extending portion 10L of the outer conductive line is made larger than that of the inner one, this empty space is used, for example, as shown by a dotted line in FIG. By widening the line width, it is possible to suppress a difference in the average value of the line widths of the linearly extending portions 10L of the respective conductive lines.

  Table 1 shows an example in which the width of the conductive lines 101 to 105 is set under a predetermined condition.

One of the conditions in this case is that only the conductive lines 101 to 105 are targeted, and the conductive lines 101 and 102 are spaced from the end of the outer conductive line 101 at intervals P ₁ , P ₂ , P ₃ , P ₄ , and P ₅ , respectively. , 103, 104, 105 are bent. As other conditions, the intervals P ₅ , P ₄ , P ₃ , P ₂ , P ₁ are equal, and the thickness and resistivity of each conductive line are also equal. Furthermore, the value in each column of the table shown for each conductive line indicates the width of each conductive line at each interval when the width of the wiring region (the total width of all conductive lines) is 1. According to this example, when the intervals P ₅ , P ₄ , P ₃ , P ₂ , P ₁ are 1, the thickness of each conductive line is 1, and each resistivity is 1, the value of each conductive line is 12.84. The resistance value is obtained.

  Even under the same conditions, there are other combinations of conductive line widths for equalizing resistance values, but as shown in Table 1, the widths of the conductive lines other than the innermost conductive line are the same in each interval. By doing so, it is considered that a relatively low resistance value can be obtained.

  FIG. 3 is an enlarged view of a part of the conductive wire 10 ′ in order to explain a detailed form of the modified conductive wire 10 ′.

  Also in FIG. 3, an enlarged shape near the bending point of the conductive wire is shown as a representative showing the formation mode.

  The conductive lines 101 ′, 102 ′, 103 ′,... In this example are different from the shape shown in FIG. 2, and the inner edges thereof are all linear, and the straight lines exhibited by the inner edges are the outer edges. Is not parallel to the straight line, but is at a slight angle. In short, the conductive wire has a tapered shape toward its starting end. According to the conductive wire having such a pattern, there is an advantage that the gap between the conductive wires can be kept constant and the pattern can be easily formed.

  In this conductive wire mode, the width of the linearly extending portion 10L ′ gradually changes over the entire length of the linearly extending portion 10L ′, and the width also changes in the interval P. However, this embodiment also changes the line width in each of the linear extending portions so that the resistance values in at least the linear extending portions 101 ′, 102 ′,... This satisfies the requirement that the line width at the position close to the bending point Q is larger than the line width at the far position, so that the basic effect as described above can be obtained in the same manner.

  It should be noted that the empty space as described above can also be used for this aspect.

  According to the embodiment as described above, not only the resistance variation of the conductive line is suppressed, but there is no need to separately provide a resistance whose resistance value is set individually. Can be made as equal as possible.

  By using the bent wiring pattern form according to the present invention for the conductive lines of the electronic device, the delay, amplitude and other qualities of signals transmitted by the conductive lines can be made uniform, which is particularly suitable for display panels. It will be a thing. Further, in particular, the configuration in which conductive lines are connected from both sides of the display area 1d as shown in FIG. 1 can lead the conductive lines almost symmetrically, so that the conductive lines are formed on the use area. The bias is extremely small, which is convenient for keeping the thickness of the liquid crystal layer in the liquid crystal display panel uniform.

  Although the liquid crystal display panel has been described in the above embodiments, the present invention is not necessarily limited to this, and it is needless to say that the present invention can be applied to various types of electronic devices including other types of display devices. Further, in the above-described embodiment, a form in which the bending angle of the conductive wire is a right angle is described, but the present invention can be applied to other forms (that is, a form bent at an angle other than a right angle).

  Furthermore, although the display area has been described as being rectangular in the above embodiment, the present invention is not necessarily limited to this. In addition, although the conductive line is connected to the gate electrode line as an example, it may be connected to the source electrode line, and the present invention can be applied to display devices other than the active matrix drive type. Of course.

  Although several typical embodiments according to the present invention have been described above, those skilled in the art can make various modifications as necessary without departing from the scope of the invention described in the claims. Can do.

  The present invention can be applied to an electronic device having a bent wiring pattern.

FIG. 1 is a schematic external plan view of a substrate used in an electronic device according to an embodiment of the present invention. FIG. 2 is a partially schematic enlarged view of a conductive wire according to the embodiment of FIG. FIG. 3 is a partially schematic enlarged view of a conductive wire according to a modified example of the present invention.

Claims (7)

An electronic device having a substrate on which a plurality of conductive lines having a pattern extending in a straight line from a predetermined start end and sequentially bent in substantially the same direction at predetermined intervals and extending to predetermined connection destinations are formed. ,
The conductive line exhibits a change in line width in the linear extension portion so that resistance values in at least the linear extension portion of the conductive line are equal, and the line width at a position near the bending point is It is formed larger than the line width at a distant position,
Electronic equipment.   2. The electronic device according to claim 1, wherein a starting end of the conductive line is connected to an input / output end of a driving circuit or a peripheral circuit of the electronic device.   The electronic device according to claim 1, wherein the connection destination of the conductive wire is a plurality of lines extending substantially in parallel with each other at a predetermined interval.   The electronic device according to claim 1, wherein the bending angle is substantially a right angle.   2. The electronic device according to claim 1, wherein a plurality of regions extending in parallel with each other at a predetermined interval from the position of the one side to the position of the other side in a display region defined by at least one side and the other side facing each other. An electronic device having a bus line, wherein the linear portion is arranged in an area outside the display area adjacent to at least one of the one side and the other side.   6. The electronic device according to claim 5, wherein the bus line is a row electrode line, a gate electrode line, a column electrode line, or a source electrode line.   6. The electronic device according to claim 5, wherein the display area is also defined by third and fourth sides facing each other and formed substantially perpendicular to the one side and the other side, and the driving circuit or the peripheral circuit. Is an electronic device provided in a region outside the display region adjacent to at least one of the third and fourth sides.

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