JP2007027387A - Display unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display unit which prevents connection failures of wiring, disposed in different conductive layers. <P>SOLUTION: A liquid crystal display unit comprises a liquid crystal display panel 1, comprising an effective display 6 constituted of a plurality of display pixels PX. The liquid crystal display unit further comprises a lower layer wiring WL disposed on the liquid crystal display panel 1, and an upper layer wiring WU facing a part of the lower layer wiring WL via an insulating film 14 disposed on the lower layer wiring WL. The lower layer wiring WL is connected to the upper layer wiring WU via a plurality of contact holes H1, H2 formed in a connection part 14A, where the lower layer wiring WL and the upper layer wiring WU of the insulating film 14 face each another, and the lower layer wiring WL has a recess 12 at least at one location of an edge E facing the upper layer wiring WU. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly, to a display device provided with wirings arranged at high density.

  A display device such as a liquid crystal display device includes an effective display unit configured by matrix display pixels. The effective display section includes a plurality of scanning lines extending along the row direction of the display pixels, a plurality of signal lines extending along the column direction of the display pixels, and in the vicinity of an intersection between the scanning lines and the signal lines. A switching element arranged, a pixel electrode connected to the switching element, and the like are provided. Each of these scanning lines and each signal line is drawn out to the outer peripheral part of the effective display part.

  The liquid crystal display device includes a plurality of conductive layers, for example, a conductive layer in which a gate electrode of a switching element is disposed, a conductive layer in which a source electrode and a drain electrode are disposed, a conductive layer in which a pixel electrode is disposed, and the like. is doing. The effective display portion and various wirings arranged on the outer peripheral portion of the effective display portion are formed on any of the plurality of conductive layers. Wirings formed in different conductive layers are connected through contact holes in an insulating film disposed between the conductive layers.

  At this time, connection failure due to the abnormality of the contact hole, connection failure due to disconnection of the upper layer wiring at the step portion formed by the edge of the wiring arranged in the lower layer may occur.

Conventionally, a technique described in Patent Document 1 is known as a technique for realizing a multilayer wiring structure connected without causing connection failure.
JP-A-5-347358

  However, the above method improves the connection failure between the wide lower layer wiring and the bonding pad by forming an assembly of a plurality of contact holes, and the connection between the wirings arranged in the upper layer and the lower layer is performed. It is difficult to apply. In other words, there is a risk of poor connection due to disconnection at the stepped portion where the upper layer wiring rides over the lower layer wiring.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a display device capable of preventing poor connection of wirings arranged in different conductive layers.

  A display device including a display panel including an effective display unit configured by a plurality of display pixels, the first wiring disposed on the display panel, and an insulating film disposed on the first wiring A second wiring that opposes a part of the first wiring, and the first wiring and the second wiring are connected so that the first wiring and the second wiring of the insulating film face each other. The display device is connected through a plurality of contact holes formed in a portion, and the first wiring has a concave portion at least at one position of an edge facing the second wiring.

  According to the present invention, it is possible to provide a display device capable of preventing connection failure of wirings arranged in different conductive layers.

  A display device according to an embodiment of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, a liquid crystal display device as an example of a display device includes a liquid crystal display panel 1 having a substantially rectangular flat plate shape. The liquid crystal display panel 1 is composed of a pair of substrates, that is, an array substrate 3 and a counter substrate 4, and a liquid crystal layer 5 held as a light modulation layer between the pair of substrates. The liquid crystal display panel 1 includes a substantially rectangular effective display unit 6 for displaying an image. The effective display unit 6 includes a plurality of display pixels PX arranged in a matrix, a plurality of signal supply wirings for supplying a drive signal to each display pixel PX, and the like.

  The array substrate 3 is, for example, a plurality of scanning lines Y (1, 2, 3,...) Extending along the row direction (X direction) of the display pixels PX as signal supply wirings arranged in the effective display unit 6. m) and a plurality of signal lines X (1, 2, 3,..., n) extending along the column direction (Y direction) of the display pixels PX.

  The array substrate 3 includes a switching element 7 and a switching element arranged for each display pixel PX in the vicinity of the intersection between the scanning lines Y and the signal lines X in addition to the signal supply wirings in the effective display unit 6. 7 is connected to the pixel electrode 8 and the like.

  The counter substrate 4 includes a counter electrode 9 and the like common to all the display pixels PX in the effective display unit 6. The array substrate 3 and the counter substrate 4 are disposed with the pixel electrodes 8 and the counter electrodes 9 of all the display pixels PX facing each other, and a gap is formed between them. The liquid crystal layer 5 is formed of a liquid crystal composition sealed in the gap between the array substrate 3 and the counter substrate 4.

  In the color display type liquid crystal display device, the liquid crystal display panel 1 includes a plurality of types of display pixels, for example, a red pixel that displays red (R), a green pixel that displays green (G), and a blue that displays blue (B). Has pixels. That is, the red pixel includes a red color filter that transmits light having a red main wavelength. The green pixel includes a green color filter that transmits light having a green dominant wavelength. The blue pixel includes a blue color filter that transmits light having a blue main wavelength. These color filters are arranged on the main surface of the array substrate 3 or the counter substrate 4.

  The liquid crystal display panel 1 includes a first connection portion 31 and a second connection portion 32 that are disposed on the outer peripheral portion 10 located outside the effective display portion 6. The first connection unit 31 can be connected to the drive IC 11 that functions as a signal supply source that supplies a drive signal to the signal supply wiring. The 2nd connection part 32 is connectable with the flexible wiring board FPC which functions as a signal supply source. In the example shown in FIG. 1, the first connection portion 31 and the second connection portion 32 are disposed on the extending portion 10 </ b> A of the array substrate 3 that extends outward from the end portion 4 </ b> A of the counter substrate 4. . The drive IC 11 and the first connection portion 31 are electrically and mechanically connected through, for example, an anisotropic conductive film.

  The driving IC 11 includes a signal line driving unit 11X that supplies a driving signal to the signal line X and a scanning line driving unit 11Y that supplies a driving signal to the scanning line Y. The scanning line driving unit 11Y is electrically connected to each scanning line Y (1, 2, 3,...) Via the connection wiring WY. That is, the drive signal output from the scanning line driving unit 11Y is supplied to each corresponding scanning line Y (1, 2, 3,...) Via each connection wiring WY. The switching elements 7 included in each display pixel PX in each row are on / off controlled based on the scanning signal supplied from the corresponding scanning line Y.

  Further, the signal line driver 11X is electrically connected to each signal line X (1, 2, 3,...) Via the connection wiring WX. That is, the drive signal output from the signal line driver 11X is supplied to each corresponding signal line X (1, 2, 3,...) Via each connection wiring WX. The switching element 7 included in each display pixel PX of each column writes the video signal supplied from the corresponding signal line X to the pixel electrode 8 at the timing when it is turned on.

  The switching element 7 is composed of a thin film transistor (TFT) or the like. The gate electrode 7G of the switching element 7 is electrically connected to the corresponding scanning line Y (or formed integrally with the scanning line). The source electrode 7S of the switching element 7 is electrically connected to the corresponding signal line X (or formed integrally with the signal line). The drain electrode 7D of the switching element 7 is electrically connected to the pixel electrode 8 of the corresponding display pixel PX.

  The array substrate 3 has a plurality of conductive layers, for example, a conductive layer in which the gate electrode 7G is disposed, a conductive layer in which the source electrode 7S and the drain electrode 7D are disposed, a conductive layer in which the pixel electrode 8 is disposed, and the like. is doing. Various wirings such as the signal lines X, the scanning lines Y, and the connection wirings WX and WY arranged in the effective display unit 6 and the outer peripheral unit 10 are arranged in any conductive layer in the array substrate 3.

  As described above, when various wirings are formed in different conductive layers, wirings arranged in different conductive layers on the array substrate 3 may be connected. For example, as shown in FIGS. 2 and 3, the inspection wiring W <b> 1 is arranged in a portion to which the driving IC 11 is connected. The inspection wiring W1 includes a lower layer wiring WL (first wiring) disposed in the first conductive layer GL and an upper layer wiring WU (second wiring) disposed in the second conductive layer SDL.

  As shown in FIG. 3, an insulating film 14 is disposed on the lower layer wiring WL. Further, an upper layer wiring WU is disposed in the second conductive layer SDL on the insulating film 14. The insulating film 14 has a connection portion 14A where the upper layer wiring WU and the lower layer wiring WL are opposed to each other. The lower layer wiring WL and the upper layer wiring WU are connected via a plurality of contact holes formed in the connection portion 14A of the insulating film 14, that is, the first contact hole H1 and the second contact hole H2. The lower layer wiring WL has a recess 12 in at least one position of the edge E facing the upper layer wiring WU.

  In the example shown in FIG. 2, the lower layer wiring WL and the upper layer wiring WU both extend, for example, in the direction in which the signal line X extends (Y direction). The first and second contact holes H1 and H2 are arranged along the direction (Y direction) in which the lower layer wiring WL and the upper layer wiring WU extend. The lower layer wiring WL has a recess 12 at an edge E extending in the Y direction. The recess 12 is formed between the first contact hole H1 and the second contact hole H2 in the direction in which the first and second contact holes H1, H2 are arranged (Y direction).

  The recess 12 is formed, for example, in a U-shape, and has a first edge 12E1 extending in the Y direction and two second edges 12E2 extending in the X direction substantially orthogonal to the first edge 12E1. The width L1 of the upper layer wiring WU extending in the Y direction is larger than the width L2 of the lower layer wiring WL. Note that the width of the wiring here corresponds to the length in the direction orthogonal to the direction in which the wiring extends, and corresponds to the length in the X direction in the example shown in FIG. The upper layer wiring WU is disposed so as to cover the lower layer wiring WL. That is, the upper layer wiring WU is disposed so as to oppose the two edges E in which the concave portion 12 and the concave portion 12 are formed in the lower layer wiring WL.

  When the insulating film 14 is disposed on the lower layer wiring WL having the concave portion 12 as described above, the inclination of the insulating film 14 disposed on the second edge 12E2 of the concave portion 12 is inclined as shown in FIG. It becomes gentler than the inclination of the insulating film 14 disposed on the edge E on the front end side. That is, the slope of the stepped portion that can be formed on the recess 12 when the upper layer wiring WU is disposed on the insulating film 14 is gentler than the stepped portion that can be formed on the edge E. From this, when the upper layer wiring WU is disposed on the insulating film 14, disconnection of the upper layer wiring WU disposed on the recess 12 can be suppressed.

  Further, since the lower layer wiring WL and the upper layer wiring WU are connected via the first and second contact holes H1 and H2, a connection failure occurs due to an abnormality in one contact hole, for example, the first contact hole H1. Even so, it is possible to connect the lower layer wiring WL and the upper layer wiring WU by the second contact hole H2, and as the number of contact holes for connecting the lower layer wiring WL and the upper layer wiring WU increases, the contact hole increases. It is possible to reduce the probability of connection failure due to the abnormality.

  As described above, the lower layer wiring WL and the upper layer wiring WU are connected via the first and second contact holes H1 and H2, and the lower layer wiring WL has the recess 12 at the edge E facing the upper layer wiring WU. Occurrence of disconnection failure between the lower layer wiring WL and the upper layer wiring WU can be suppressed.

  Further, the configuration for connecting the wirings arranged in different conductive layers is not limited to the configuration in the case of the above-described inspection wiring W1, for example, the configuration of the lower layer wiring WL and the upper layer wiring WU as shown in FIG. good. Hereinafter, another configuration for connecting wires arranged in different conductive layers in the effective display portion 6 and the outer peripheral portion 10 of the liquid crystal display panel 1 will be described with reference to FIG. The configuration shown in FIG. 4 is the same as that in the above embodiment except for the extending direction of the lower layer wiring WL and the upper layer wiring WU, the arrangement of the first and second contact holes, and the arrangement of the recess 12. Therefore, detailed description is omitted here.

  In the case shown in FIGS. 4A to 4C, the lower layer wiring WL and the upper layer wiring WU both extend in the Y direction as in the case shown in FIG. In the case shown in FIG. 4A, the lower layer wiring WL and the upper layer wiring WU are connected via the first and second contact holes H1 and H2 arranged in the X direction. The lower layer wiring WL has a recess 12 at an edge E extending in the direction (X direction) in which the first and second contact holes H1 and H2 are arranged. The recess 12 is disposed between the first contact hole H1 and the second contact hole H2 in the X direction.

  In the case shown in FIG. 4B, similarly to the case shown in FIG. 2, the lower layer wiring WL and the upper layer wiring WU are connected through the first and second contact holes H1 and H2 arranged in the Y direction. The lower layer wiring WL has a recess 12 at an edge E extending in a direction (X direction) substantially orthogonal to the direction (Y direction) in which the first and second contact holes H1 and H2 are arranged.

In the case shown in FIG. 4C, similarly to the case shown in FIG. 4B, the lower layer wiring WL and the upper layer wiring WU are connected via the first and second contact holes H1 and H2 arranged in the Y direction. ing. The lower layer wiring WL has a recess 12 at an edge E extending in the direction (Y direction) in which the first and second contact holes H1, H2 are arranged. The recess 12 is arranged between the first contact hole H1 and the edge EU extending in the X direction of the upper layer wiring WU in the Y direction. In the case shown in FIG. 4D, the lower layer wiring WL extends in the X direction. The upper layer wiring WU extends in the Y direction. The lower layer wiring WL and the upper layer wiring WU are connected through first and second contact holes H1 and H2 arranged in the X direction. The lower layer wiring WL has a recess 12 at the edge E extending in the direction in which the first and second contact holes H1 and H2 are arranged. The recess 12 is arranged between the contact hole H1 and the contact hole H2 in the direction in which the first and second contact holes H1, H2 are arranged.

  4A to 4D, as in the case shown in FIG. 2, the inclination of the insulating film 14 disposed on the recess 12 can be made gentle, and the upper wiring WU. Can be suppressed. As a result, even when the upper layer wiring WU is disconnected at the portion disposed on the edge E of the lower layer wiring WL, the disconnection is suppressed at the portion disposed on the concave portion 12 of the upper layer wiring WU. The wiring WU and the lower layer wiring WL are connected via the first and second contact holes H1 and H2.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the spirit of the invention in the stage of implementation. For example, in the above embodiment, the configuration of the inspection wiring W in the portion where the drive IC 11 is disposed has been described. However, in the effective display portion 6 and the outer peripheral portion 10, any portion that connects wirings disposed in different conductive layers may be used. For example, the same effect as the above embodiment can be obtained.

  In the above embodiment, the recess 12 is configured by the first and second edges 12E1 and 12E2. However, the shape of the recess 12 may be configured by an arc or two or more edges. Also in this case, the inclination of the insulating film 14 disposed on the recess 12 can be made gentle, and disconnection of the upper layer wiring WU can be suppressed.

  In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably. In the lower layer wiring WL shown in FIG. 2, one recess 12 is disposed at each of two edges E extending in the Y direction, but a plurality of recesses 12 may be disposed at each edge E. Also in this case, the inclination of the insulating film 14 disposed on each recess 12 can be made gentle, and disconnection of the upper layer wiring WU can be suppressed.

1 is a diagram schematically showing a liquid crystal display panel of a liquid crystal display device according to an embodiment of the present invention. The figure which shows schematically the structure which connects the test | inspection wiring in the liquid crystal display panel shown in FIG. The figure which shows an example of the cross section which cut | disconnected inspection wiring shown in FIG. 2 by AA. (A)-(d): The figure which showed roughly the other structural example which connects the wiring in the liquid crystal display panel shown in FIG.

Explanation of symbols

  PX ... display pixel, Y (1,2, ..., m) ... scanning line, X (1,2, ..., n) ... signal line, FPC ... flexible wiring board, 1 ... liquid crystal display panel, 3 ... array substrate, DESCRIPTION OF SYMBOLS 4 ... Counter substrate, 5 ... Liquid crystal layer, 6 ... Effective display part, 7 ... Switch element, 7G ... Gate electrode, 7S ... Source electrode, 7D ... Drain electrode, 8 ... Pixel electrode, 9 ... Counter electrode, 10 ... Outer peripheral part DESCRIPTION OF SYMBOLS 10A ... Extension part, 11 ... Drive IC, 11X ... Signal line drive part, 11Y ... Scanning line drive part, 12 ... Recessed part, 12E1 ... 1st edge, 12E2 ... 2nd edge, 14 ... Insulating film, E ... Edge , H1 ... first contact hole, H2 ... second contact hole, W1 ... inspection wiring, WL ... lower layer wiring, WU ... upper layer wiring, WX, WY ... connection wiring, GL, SDL, PL ... conductive layer

Claims (6)

A display device including a display panel including an effective display unit configured by a plurality of display pixels,
A first wiring disposed on the display panel;
A second wiring facing a part of the first wiring through an insulating film disposed on the first wiring;
The first wiring and the second wiring are connected through a plurality of contact holes formed in a connection portion where the first wiring and the second wiring of the insulating film face each other;
The display device in which the first wiring has a recess in at least one portion of an edge facing the second wiring.   The display device according to claim 1, wherein the connection portion is disposed on an outer peripheral portion located outside the effective display portion.   The display device according to claim 1, wherein each of the contact holes is arranged along a direction in which at least one of the first wiring and the second wiring extends.   The display device according to claim 1, wherein the recess is formed at an edge extending in a direction in which a plurality of contact holes are arranged.   The display device according to claim 1, wherein a width of the second wiring is larger than a width of the first wiring.   The display device according to claim 1, wherein the recess is formed between the plurality of contact holes in a direction in which the plurality of contact holes are arranged.

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