JP2013057833A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device which adopts a vertical alignment mode, reduces display unevenness, and is preferable for multiplex driving.SOLUTION: A liquid crystal display device 1 is composed of a liquid crystal display panel 10 having a common electrode 3 extending in a horizontal direction; a driving IC 4 for respectively outputting scanning signals from output terminals C1-C6 to the common electrode 3; and wirings CL1-CL6 for connecting the common electrode 3 and the output terminals C1-C6 of the driving IC 4. In the common electrode 3, common electrodes 3-1, 3-3, and 3-5, and common electrodes 3-2, 3-4, and 3-6 which have wiring taking-out directions different from each other are alternately disposed one by one. The wirings CL1-CL6 are disposed so as to make the scanning signals of the driving IC 4 outputted to the common electrodes 3-2, 3-4, and 3-6, after outputted to the common electrodes 3-1, 3-3, and 3-5.

Description

  The present invention relates to a liquid crystal display device.

  The liquid crystal display device is configured using a liquid crystal display panel. In a liquid crystal display panel, a liquid crystal layer is sandwiched between a transparent substrate disposed on the viewer side and a transparent substrate disposed on the opposite side of the viewer so as to face the transparent substrate. Composed. The liquid crystal layer of the liquid crystal display panel is made of, for example, nematic phase liquid crystal (hereinafter also referred to as nematic liquid crystal). A transparent electrode made of, for example, ITO (Indium Tin Oxide) is provided on the inner surface of each substrate. Between the electrode on each substrate and the liquid crystal layer, an alignment film is provided as an alignment control layer for realizing uniform initial alignment of the liquid crystal. Then, the liquid crystal layer changes its orientation from the initial alignment state in accordance with the electric field applied between the electrodes, and the polarization state of light transmitted through the liquid crystal layer is controlled. On the outer surfaces of the two substrates facing each other with the liquid crystal layer interposed therebetween, a pair of polarizing plates are arranged on the observer side and the opposite side with the two substrates interposed therebetween.

  Liquid crystal display devices are classified into several modes based on the initial alignment state of the liquid crystal layer and the operation of the liquid crystal when a voltage is applied. For example, a vertical alignment (VA) mode is used in a so-called in-vehicle liquid crystal display device such as a liquid crystal television or an instrument panel of a vehicle such as an automobile, and a vertical alignment type liquid crystal display device is configured. (See, for example, Patent Document 1 and Patent Document 2).

  In a vertical alignment type liquid crystal display device, a negative dielectric anisotropy (Δε) is aligned between two substrates of a liquid crystal display panel so that the initial alignment state is substantially perpendicular to the substrate (vertical alignment). A liquid crystal layer is provided. As for the polarizing plate, a pair of polarizing plates is usually arranged on the outer surfaces of the two substrates so as to form a crossed Nicol with a liquid crystal layer interposed therebetween. When a voltage is applied to the liquid crystal layer through the electrode, the alignment of the liquid crystal changes and the liquid crystal tends to be perpendicular to the electric field. As a result, the liquid crystal layer is aligned in a direction parallel to the substrate. Due to the orientation change of the liquid crystal layer, in the region where a voltage is applied, the product (Δn · d) of the refractive index anisotropy (Δn) of the liquid crystal and the thickness (d) of the liquid crystal layer is compared with the initial state. The light transmission characteristics determined by the change. In a vertical alignment type liquid crystal display device, a desired display is performed by utilizing a change in light transmission characteristics at a voltage application portion.

  A vertical alignment type liquid crystal display device has characteristics of high contrast ratio when viewed from the front, wide viewing angle, and excellent visibility. Therefore, the present invention is applied to an active matrix liquid crystal display device in which a switching element such as a TFT is provided for each pixel, and is widely used for televisions as described above.

Japanese Patent Laid-Open No. 5-113561 JP-A-10-123576

The vertical alignment type liquid crystal display device has the above-described excellent features and is required to be applied in a wider range. Specifically, there is a demand for application to a passive matrix liquid crystal display device using multiplex drive that is simpler to manufacture and has higher productivity. For example, the use for the display of portable electronic devices, such as a mobile telephone and a portable computer, is calculated | required.
However, the application of the vertical alignment type passive matrix liquid crystal display device is limited at present and its application is also limited. One of the reasons is a problem of display unevenness that occurs in a vertical alignment type passive matrix liquid crystal display device using multiplex driving.

  In a passive matrix liquid crystal display device driven in multiplex, a plurality of elongated common electrodes (scanning electrodes) in which the electrodes of the liquid crystal display panel extend in the horizontal direction (row direction) or the vertical direction (column direction) so as to support dot matrix display. And a segment electrode (also referred to as a signal electrode) extending in the vertical direction (column direction) or the horizontal direction (row direction) so as to intersect the common electrode. Then, each common electrode is sequentially selected and driven, and in synchronization with the selection period of each common electrode, a voltage corresponding to image display is applied to the segment electrode, and the liquid crystal in the intersection region of the common electrode and the segment electrode is applied. The orientation change of the layer is promoted to display a desired image. By performing such multiplex driving, a high-density dot matrix display is possible.

  At this time, in the case of a vertical alignment type passive matrix liquid crystal display device, a liquid crystal flow occurs in the liquid crystal layer of the liquid crystal display panel, which is particularly noticeable when high duty driving is performed. This flow of liquid crystal causes disorder of alignment in the liquid crystal layer. And this disorder of alignment will be visually recognized as display unevenness, and will cause the display quality of a liquid crystal display device to deteriorate.

  As described above, the deterioration of display quality due to such display unevenness hinders the expansion of the use of the vertical alignment type passive matrix liquid crystal display device. Therefore, there is a demand for a liquid crystal display device having excellent characteristics of the vertical alignment mode, reducing display unevenness, and suitable for multiplex driving.

  The present invention has been made in view of these points. That is, an object of the present invention is to provide a liquid crystal display device suitable for multiplex driving that employs a vertical alignment mode and reduces display unevenness.

  Other objects and advantages of the present invention will become apparent from the following description.

According to a first aspect of the present invention, there is provided a liquid crystal display panel having a plurality of common electrodes extending in the horizontal direction or the vertical direction and segment electrodes extending in the vertical direction or the horizontal direction so as to intersect the common electrodes;
A driving IC having a plurality of output terminals and outputting a scanning signal to each of the plurality of common electrodes;
A liquid crystal display device having a plurality of wirings connecting a common electrode of a liquid crystal display panel and an output terminal of a driving IC,
The plurality of common electrodes are configured such that a plurality of first common electrodes and second common electrodes that are different from each other in the direction of wiring extraction are alternately arranged one by one,
The wiring is arranged so that a scanning signal from the driving IC is output to each of the plurality of first common electrodes and then output to each of the plurality of second common electrodes. About.

According to a second aspect of the present invention, there is provided a liquid crystal display panel having a plurality of common electrodes extending in the horizontal direction or the vertical direction and segment electrodes extending in the vertical direction or the horizontal direction so as to intersect the common electrodes;
A driving IC having a plurality of output terminals and outputting a scanning signal to each of the plurality of common electrodes;
A liquid crystal display device having a plurality of wirings connecting a common electrode of a liquid crystal display panel and an output terminal of a driving IC,
The plurality of wirings are arranged such that at least one of the plurality of wirings forms an intersection that intersects the other wirings or the common electrode connected to the other wirings through an insulating layer,
The present invention relates to a liquid crystal display device configured to output a scanning signal from a driving IC to a common electrode excluding a common electrode adjacent to the common electrode from which the scanning signal was output immediately before.

In the second aspect of the present invention, the driving IC is disposed on the liquid crystal display panel,
It is preferable that the intersection is formed on the liquid crystal display panel.

In the second aspect of the present invention, the driving IC is disposed on a printed circuit board connected to the liquid crystal display panel,
It is preferable that a part of the plurality of wirings is disposed on the printed circuit board and the intersection is formed on the printed circuit board.

  In the second aspect of the present invention, the printed circuit board is preferably a flexible printed circuit board.

  In the first aspect or the second aspect of the present invention, the liquid crystal display panel is preferably a vertical alignment type liquid crystal display panel configured by sandwiching vertically aligned liquid crystal between a pair of substrates.

  According to the present invention, a liquid crystal display device suitable for multiplex driving is provided by adopting a vertical alignment mode and reducing display unevenness.

It is a top view which illustrates typically the structure of the liquid crystal display device of 1st Embodiment of this invention. It is a figure which illustrates typically the cross-sectional structure of the liquid crystal display device of this embodiment. It is a figure explaining the method of the image display in this embodiment, (a) is a figure explaining the method of the image display performed using the conventional liquid crystal display device, (b) is the liquid crystal of this embodiment. It is a figure explaining the method of the image display performed using a display apparatus. It is a top view which illustrates typically the structure of the liquid crystal display device of 2nd Embodiment of this invention. It is a top view which illustrates typically the structure of the liquid crystal display device of 3rd Embodiment of this invention. It is a top view which illustrates typically the structure of the liquid crystal display device of 4th Embodiment of this invention. It is a top view which illustrates typically the structure of the conventional liquid crystal display device which has the conventional wiring structure.

  The present inventors have studied display unevenness that occurs when a vertically aligned liquid crystal display device is multiplex-driven, and have come to the present invention. Hereinafter, a liquid crystal display device according to an embodiment of the present invention will be described with reference to the drawings and a liquid crystal display device having a conventional structure as appropriate. In the description of each drawing, common constituent elements are given the same reference numerals, and redundant description is omitted.

  FIG. 7 is a plan view schematically illustrating the structure of a conventional liquid crystal display device having a conventional wiring structure.

A conventional liquid crystal display device 1000 shown in FIG. 7 is a vertical alignment type liquid crystal display device 1000 using a vertical alignment mode liquid crystal display panel 1001. The liquid crystal display device 1000 includes a driving IC 1004 disposed on the liquid crystal display panel 1001 and a plurality of wirings CL1001 to CL1006 connected to the driving IC 1004.
A vertical alignment mode liquid crystal display panel 1001 crosses a common electrode 1003 and a plurality of common electrodes 1003 extending in a horizontal direction (row direction) on a pair of substrates 1011 and 1012 sandwiching a liquid crystal layer (not shown). And segment electrodes (not shown in FIG. 7) extending in the vertical direction (column direction). The substrate 1011 and the substrate 1012 are fixed to each other by a seal portion 1005. The liquid crystal display device 1000 includes a vertical alignment mode liquid crystal display panel 1001 and constitutes a vertical alignment passive matrix liquid crystal display device.

  The driving IC 1004 disposed on the liquid crystal display panel 1001 has output terminals C1001 to C1006 that sequentially output scanning signals to each of the plurality of common electrodes 1003 of the liquid crystal display panel 1001.

  As shown in FIG. 7, each of the plurality of common electrodes 1003-1 to 1003-6 of the liquid crystal display panel 1001 has a shape extending in the horizontal direction, and one end on the left side is used to extract wiring. Is done.

  A plurality of wirings CL1001 to CL1006 connect between each of the common electrodes 1003 and the output terminals C1001 to C1006 of the drive IC 1004, respectively. That is, the wiring CL1001 is connected to the output terminal C1001 of the driving IC 1004, and the other wirings CL1002 to CL1006 are similarly connected to the output terminals C1002 to C1006 of the corresponding driving IC 1004. Each of the wirings CL1001 to CL1006 is connected to the common electrode 1003, and has a wiring structure in which scanning signals output from the output terminals C1001 to C1006 of the driving IC 1004 are input to each of the common electrodes 1003.

  More specifically, in the liquid crystal display device 1000, scanning signals are sequentially output from the output terminals C1001 to C1006 of the drive IC 1004 in the order of the output terminals C1001 to C1006. Then, for each of the common electrodes 1003 arranged in the vertical direction of the liquid crystal display panel 1001, scanning is performed from the common electrode 1003-1 at the top to the other common electrodes 1003-2 to 1003-6 below the common electrode 1003-1. A line sequential scanning in which signals are sequentially input is realized.

  In the conventional vertical alignment type liquid crystal display device 1000 having such a structure, as described above, specific display unevenness occurs. The occurrence of this display unevenness is affected by the line sequential scanning according to the conventional method described above. That is, in the line sequential scanning according to the conventional method, a scanning signal is output in the order of arrangement with respect to each of the plurality of common electrodes 1003, and selection is performed. Therefore, after the scanning signal is output to one common electrode of the plurality of common electrodes, the subsequent scanning signal is output to the common electrode adjacent to the one common electrode. Such a method induces a flow of liquid crystal (not shown) by selection of one common electrode, and subsequent selection of the adjacent common electrode facilitates the flow of the liquid crystal. As a result, display unevenness occurs in the vertical alignment type liquid crystal display device 1000.

  Therefore, the liquid crystal display device of this embodiment has a novel structure that can reduce the flow of liquid crystal induced by line sequential scanning when multiplex driving is performed. Hereinafter, the liquid crystal display device of this embodiment will be described.

[Embodiment 1]
FIG. 1 is a plan view schematically illustrating the structure of the liquid crystal display device according to the first embodiment of the present invention.

  A liquid crystal display device 1 of the present embodiment shown in FIG. 1 includes a liquid crystal display panel 10 in a vertical alignment mode, a drive IC 4 that is disposed on the liquid crystal display panel 10 and sequentially outputs scanning signals from a plurality of output terminals C1 to C6. And a plurality of wirings CL1 to CL6 that connect between the common electrode 3 of the liquid crystal display panel 10 and the driving IC 4.

  FIG. 2 is a diagram schematically illustrating a cross-sectional structure of the liquid crystal display device of the present embodiment.

  In FIG. 2, in order to explain the structure of each part of the liquid crystal display device 1 of the present embodiment and the connection structure between the parts, it is schematically shown so as to include the wiring CL1 and the driving IC 4 as well.

  As shown in FIG. 2, the liquid crystal display panel 10 of the liquid crystal display device 1 of the present embodiment includes a transparent substrate 11 disposed on the viewer (not shown) side and an observer facing the substrate 11. A liquid crystal layer 13 is sandwiched between a transparent substrate 12 disposed on the opposite side and formed larger than the substrate 11. A sealing portion 5 is provided around the liquid crystal layer 13 to fix the substrate 11 and the substrate 12 that sandwich the liquid crystal layer 13 to each other. The liquid crystal layer 13 of the liquid crystal display panel 10 is made of nematic liquid crystal. In the liquid crystal display device 1 of the present embodiment, the liquid crystal layer 13 is a liquid crystal layer having negative dielectric anisotropy (Δε) that is aligned so that the initial alignment state is substantially perpendicular (vertical alignment) to the substrates 11 and 12. 13 is possible. In that case, the liquid crystal display panel 10 is in the vertical alignment mode as described above. A drive IC 4 is mounted on a terminal portion of the substrate 12 protruding from the substrate 11.

As shown in FIG. 2, a plurality of common electrodes 3 and a plurality of segment electrodes 14 are arranged on the inner surfaces of the two substrates 11 and 12 that sandwich the liquid crystal layer 13.
A liquid crystal display panel 10 in the vertical alignment mode shown in FIGS. 1 and 2 includes a plurality of elongated strip-like common electrodes 3 extending in the horizontal direction (row direction) and the vertical direction (column direction) so as to intersect the common electrodes 3. And a plurality of segment electrodes 14 (not shown in FIG. 1). The common electrode 3 is disposed on the substrate 11 and the segment electrode 14 (not shown in FIG. 1) is disposed on the substrate 12. The common electrode 3 and the segment electrode 14 are formed by patterning a transparent conductive film made of a transparent conductive material such as ITO, for example.

  As shown in FIG. 1, each of the plurality of common electrodes 3-1 to 3-6 has, for example, a shape extending in the horizontal direction, and one of the ends of the common electrodes 3-1 to 3-6 is used. It has a structure for taking out.

  In the liquid crystal display panel 10 of the liquid crystal display device 1 according to the present embodiment shown in FIG. 1, the common electrodes 3-1 to 3-6 are common electrodes 3-1, 3-3, 3- 5 and different common electrodes 3-2, 3-4, and 3-6. That is, in the liquid crystal display panel 10 of FIG. 1, an end portion where wiring is taken out between the common electrodes 3-1, 3-3, 3-5 and the common electrodes 3-2, 3-4, 3-6. Is different. In the plurality of common electrodes 3-1, 3-3, 3-5, wiring is taken out at the left end in the row direction, and in the plurality of common electrodes 3-2, 3-4, 3-6, the row direction Wiring is taken out at the right end of the line. As a result, the common electrodes 3-1 to 3-6 of the liquid crystal display panel 10 are different from the common electrodes 3-1, 3-3, and 3-5 in which the wiring extraction direction is the same. The common electrodes 3-2, 3-4, and 3-6 in the reverse direction are alternately arranged one by one.

  The liquid crystal display panel 10 shown in FIG. 1 has a structure in which the common electrode 3 extends in the horizontal direction. However, the present embodiment is not limited to this structure, and the common electrode of the liquid crystal display panel 10 is in the vertical direction (column direction). It is also possible to have a structure extending in the direction. In that case, the segment electrode has a structure extending in the horizontal direction (row direction).

  As shown in FIG. 1, the liquid crystal display panel 10 has a structure in which six common electrodes 3 are arranged. However, this is an example, and the present embodiment is not limited to such a structure. Can have a structure in which a larger number of common electrodes 3 are arranged. Similarly, the drive IC 4 can have a larger number of output terminals.

In the liquid crystal display panel 10, an alignment film (not shown) that realizes a uniform initial alignment of liquid crystals is provided between the common electrode 3 and the segment electrode 14 on each of the substrates 11 and 12 and the liquid crystal layer 13. On the outer surface of the two substrates 11 and 12 facing each other with the liquid crystal layer 13 interposed therebetween, a pair of polarizing plates (not shown) are arranged on the observer side and the opposite side with the two substrates 11 and 12 interposed therebetween. Is done. The polarizing plate is arranged so as to form a crossed Nicol with the liquid crystal layer 13 interposed therebetween.
The liquid crystal display device 1 constitutes a vertical alignment type passive matrix liquid crystal display device using a vertical alignment mode liquid crystal display panel 10.

  As shown in FIGS. 1 and 2, a driving IC 4 is disposed on the peripheral edge of the liquid crystal display panel 10 on the substrate 12. As described above, the drive IC 4 has the output terminals C1 to C6 that sequentially output scanning signals to the plurality of common electrodes 3-1 to 3-6 of the liquid crystal display panel 10, respectively.

  The drive IC 4 has a structure in which six output terminals are arranged. However, this is an example, and the present embodiment is not limited to such a structure, and the drive IC 4 has a structure in which a larger number of output terminals are arranged. It is possible. Further, the shape of the drive IC 4 and the arrangement structure of the output terminals C1 to C6 are not limited to the shape shown in FIG. 1, and various structures can be used as long as the structure has a plurality of output terminals that sequentially output scanning signals. Is possible.

  Each of the plurality of wirings CL1 to CL6 is connected to the output terminals C1 to C6 of the driving IC 4 at one end portion. As shown in FIG. 2, the seal portion 5 of the liquid crystal display panel 10 is provided with a transfer 15 made of a conductive member so as to penetrate the seal portion 5. Therefore, each of the plurality of wirings CL1 to CL6 is connected to the end portions of the common electrodes 3-1 to 3-6 via the transfer 15 provided in the seal portion 5 at the other tip portion.

  Then, as shown in FIG. 2, when a voltage is applied to the liquid crystal layer 13 via the common electrode 3 and the segment electrode 14, the orientation of the liquid crystal changes and the liquid crystal tends to be perpendicular to the electric field. As a result, the liquid crystal layer 13 is aligned in a direction parallel to the substrates 11 and 12. Due to the orientation change of the liquid crystal layer 13, the product of the refractive index anisotropy (Δn) of the liquid crystal and the thickness (d) of the liquid crystal layer 13 (Δn · The light transmission characteristic determined by d) changes. In the liquid crystal display device 1 of the present embodiment which is a vertical alignment type, display is performed by utilizing a change in light transmission characteristics at a voltage application portion.

  The liquid crystal display device 1 of the present embodiment having the above configuration applies a voltage corresponding to image display to the segment electrode 14 in synchronization with the selection period of the common electrodes 3-1 to 3-6 by the drive IC 4. The light transmission characteristics are changed by promoting the change in the orientation of the liquid crystal layer 13 in the intersecting region between the common electrodes 3-1 to 3-6 and the segment electrode. Then, by utilizing the change, a high-density dot matrix display is realized to enable a desired image display.

  The liquid crystal display device 1 of the present embodiment is characterized by having a characteristic of high contrast ratio when viewed from the front, a wide viewing angle, and excellent visibility by adopting a vertical alignment type. And the liquid crystal display device 1 of this embodiment can reduce the non-uniformity of display by reducing the flow of liquid crystal induced when multiplex driving is performed. Such an effect is due to the above-described characteristic wiring structure in the liquid crystal display device 1 of the present embodiment. Hereinafter, the wiring structure of the liquid crystal display device 1 of the present embodiment will be further described.

  As shown in FIG. 1, in the liquid crystal display device 1 of the present embodiment, the wirings CL1 to CL6 are respectively connected to the corresponding common electrodes 3-1 to 3 of the liquid crystal display panel 10 via the transfer 15 as described above. Connect to -6. At that time, in the liquid crystal display panel 10, the wiring drawing method from the common electrode 3 is different from the conventional liquid crystal display device 1000 of FIG. 7 as described above.

  In the liquid crystal display panel 10 of the present embodiment, the direction of wiring drawing is not uniform in the common electrode 3. Common electrodes 3-1, 3-3 and 3-5, which are a part of the plurality of common electrodes 3, are drawn out at the left end extending in the horizontal direction. The common electrode 3-1 is connected to the wiring CL1, the common electrode 3-3 is connected to the wiring CL2, and the common electrode 3-5 is connected to the wiring CL3. On the other hand, the remaining plurality of common electrodes 3-2, 3-4, and 3-6 are drawn out at the right end extending in the horizontal direction, and the common electrode 3-2 is connected to the wiring CL4, and the common electrode 3-4 Is connected to the wiring CL5, and the common electrode 3-6 is connected to the wiring CL6. As a result, in the liquid crystal display panel 10, among the common electrodes 3-1 to 3-6 arranged in the vertical direction, the common electrodes 3-1 to 3-6 are pulled out at the left end extending in the horizontal direction, and are pulled out at the right end. Are arranged alternately one by one. That is, the liquid crystal display panel 10 is configured such that the direction in which the drawn out end portion is formed is different from each other between the adjacent common electrodes 3-1 to 3-6. More specifically, it is configured such that the forming direction of the drawn-out end portion is the opposite direction.

  At this time, in the liquid crystal display device 1, the scanning signals are sequentially output in the order of the output terminals C1 to C6 from the output terminals C1 to C6 of the drive IC 4. As a result, with respect to the common electrodes 3-1 to 3-6 arranged in the vertical direction of the liquid crystal display panel 10, a scanning signal is first output to the common electrode 3-1 at the top, and then the common electrode 3-3. Are output in the order of the common electrode 3-5. Thereafter, scanning signals are sequentially output in the order of the common electrode 3-2, the common electrode 3-4, and the common electrode 3-6. That is, after the scanning signals are sequentially output from the output terminals C1 to C3 of the drive IC 4 to the common electrodes 3-1, 3-3, and 3-5 having the same direction of wiring extraction, the direction of wiring extraction is determined by these. Scan signals are sequentially output from the output terminals C4 to C6 of the driving IC 4 to the remaining common electrodes 3-2, 3-4, and 3-6.

  Therefore, in the liquid crystal display device 1, the scanning signals sequentially output from the output terminals C <b> 1 to C <b> 6 of the driving IC 4 have a shape extending in the horizontal direction, and the number of common electrodes 3 arranged in the vertical direction is 1 It has an arrangement structure of the wirings CL1 to CL6 output every two common electrodes. That is, in the liquid crystal display device 1 of the present embodiment, for example, the output of the scanning signal following the output of the scanning signal to one common electrode 3-1 is the common electrode 3-2 adjacent to the common electrode 3-1. The arrangement structure of wiring CL1-CL6 performed with respect to the common electrode 3-3 is not included.

  FIG. 3 is a diagram illustrating an image display method according to the present embodiment, and FIG. 3A is a diagram illustrating an image display method performed using the liquid crystal display device according to the present embodiment. (B) is a figure explaining the method of the image display performed using the conventional liquid crystal display device.

  The conventional liquid crystal display device 1000-1 used for the image display shown in FIG. 3B has, for example, the structure illustrated in FIG. In addition, six common electrodes COM1 to COM6 and seven segment electrodes SEG1 to SEG7 are arranged to enable dot matrix display of 6 rows and 7 columns. FIG. 3B shows a method for displaying a “Y” pattern using the above-described conventional liquid crystal display device 1000-1. In the image display using the conventional liquid crystal display device 1000-1, scanning signals are output in the order of COM1, COM2, COM3, COM4, COM5, and COM6 to the common electrodes COM1 to COM6. Then, in synchronization with the selection period of each of the common electrodes COM1 to COM6, a voltage corresponding to the display of the “Y” pattern is applied to the segment electrodes SEG1 to SEG7, and the common electrodes COM1 to COM6 and the segment electrodes SEG1 to SEG7 are connected. A pixel in the intersection area is turned on to display a “Y” pattern. In FIG. 3B, a pixel marked with a circle represents a pixel that is turned on.

  On the other hand, the liquid crystal display device 1 of the present embodiment that displays a “Y” pattern using the image display method shown in FIG. 3A has the structure shown in FIG. At this time, seven segment electrodes s1 to s7 are disposed as the segment electrodes, and the liquid crystal display device 1 of the present embodiment has the same 6 rows and 7 columns as the conventional liquid crystal display device 1000-1 of FIG. Dot matrix display. In FIG. 3A, a display that uses the liquid crystal display device 1 of the present embodiment and displays the same “Y” pattern as when the conventional liquid crystal display device 1000-1 shown in FIG. 3B is used. The method is shown.

  As shown in FIG. 3A, in the liquid crystal display device 1, after a scanning signal is output to the common electrode 3-1 at the top of the common electrodes 3-1 to 3-6, the common electrode 3- 3 and the common electrode 3-5, and then output in the order of the common electrode 3-2, the common electrode 3-4, and the common electrode 3-6. Then, in synchronization with the selection period of each of the common electrodes 3-1 to 3-6, a voltage corresponding to the display of the “Y” pattern is applied to the segment electrodes s1 to s7, and the common electrodes 3-1 to 3-6 are applied. And the pixels in the intersecting region of the segment electrodes s1 to s7 are turned on. In this way, a “Y” -shaped pattern is synthesized from each pixel that is turned on, and an image is displayed. In FIG. 3A, a pixel marked with a circle represents a pixel that is turned on.

  In the liquid crystal display device 1 of this embodiment having such a wiring structure and an image forming method, even if the flow of liquid crystal (not shown) is induced by the selection of one common electrode, the subsequent selection of the common electrode is adjacent. Since it is not performed by the common electrode but is performed at a place separated by sandwiching one common electrode, the flow of the generated liquid crystal is not promoted. As a result, for example, in the vertical alignment type conventional liquid crystal display device 1000 as shown in FIG. 7, the flow of liquid crystal induced when multiplex driving is performed can be reduced, and display unevenness is reduced. be able to.

[Embodiment 2]
FIG. 4 is a plan view schematically illustrating the structure of the liquid crystal display device according to the second embodiment of the present invention.

  A liquid crystal display device 101 of the present embodiment shown in FIG. 4 includes a liquid crystal display panel 110 in a vertical alignment mode, a drive IC 104 that is arranged on the liquid crystal display panel 110 and sequentially outputs scanning signals from a plurality of output terminals C101 to C106. And a plurality of wirings CL101 to CL106 for connecting the common electrode 103 of the liquid crystal display panel 110 and the driving IC 104.

  The liquid crystal display panel 110 has the same structure as the liquid crystal display panel 10 of the first embodiment described above except that the structure of the end of the common electrode 103 connected to the wirings CL101 to CL106 is different. The liquid crystal display device 101 has the same structure as the liquid crystal display device 1 of the first embodiment described above, except that the liquid crystal display panel 110 and the plurality of wirings CL101 to CL106 are different in the wiring drawing structure and wiring structure. Have. Hereinafter, in the description of the liquid crystal display device 101 of the present embodiment, the description overlapping with the liquid crystal display device 1 of the first embodiment described above will be omitted.

  As shown in FIG. 4, the liquid crystal display panel 110 of the liquid crystal display device 101 of the present embodiment includes a transparent substrate 111 disposed on the viewer (not shown) side, and an observer facing the substrate 111. A liquid crystal layer (not shown) is sandwiched between the transparent substrate 112 disposed on the opposite side. A seal portion 105 is provided around the liquid crystal layer, and fixes the substrate 111 and the substrate 112 that sandwich the liquid crystal layer to each other. The liquid crystal layer of the liquid crystal display panel 110 is made of nematic liquid crystal. In the liquid crystal display device 101 of the present embodiment, the liquid crystal layer of the liquid crystal display panel 110 has a negative dielectric anisotropy (Δε) in which the liquid crystal layer is aligned so that the initial alignment state is substantially perpendicular (vertical alignment) to the substrates 111 and 112. It is possible to make a liquid crystal layer having In that case, the liquid crystal display panel 110 is in the vertical alignment mode as described above.

As shown in FIG. 4, a plurality of common electrodes 103 and a plurality of segment electrodes (not shown) are arranged on the inner surfaces of the two substrates 111 and 112 that sandwich the liquid crystal layer.
The vertical alignment mode liquid crystal display panel 110 shown in FIG. 4 extends in the vertical direction (column direction) so as to intersect the common electrode 103 and a plurality of elongated strip-shaped common electrodes 103 extending in the horizontal direction (row direction). A plurality of segment electrodes (not shown). The common electrode 103 is disposed on the substrate 111, and the segment electrode (not shown) is disposed on the substrate 112. The common electrode 103 and the segment electrode are formed by patterning a transparent conductive film made of a transparent conductive material such as ITO, for example.

  As shown in FIG. 4, each of the plurality of common electrodes 103-1 to 103-6 has, for example, a shape extending in the horizontal direction, and one end of both ends thereof is used, and each wiring is taken out. Has a structure to be performed. In the liquid crystal display panel 110 shown in FIG. 4, in each common electrode 103, wiring is taken out at the left end portion from the observer.

  The liquid crystal display panel 110 shown in FIG. 4 has a structure in which the common electrode 103 extends in the horizontal direction. However, in the present embodiment, the structure is not limited to this structure, and the common electrode of the liquid crystal display panel 110 is in the vertical direction (column direction). It is also possible to have a structure extending in the direction. In that case, the segment electrode has a structure extending in the horizontal direction (row direction).

  As shown in FIG. 4, the liquid crystal display panel 110 has a structure in which six common electrodes 103 are arranged. However, this is an example, and the present embodiment is not limited to such a structure. Can have a structure in which a larger number of common electrodes 103 are arranged.

In the liquid crystal display panel 110, an alignment film (not shown) that realizes uniform initial alignment of liquid crystal is provided between the common electrode 103 and the segment electrodes on the substrates 111 and 112 and the liquid crystal layer. On the outer surface of the two substrates 111 and 112 facing each other with the liquid crystal layer interposed therebetween, a pair of polarizing plates (not shown) are arranged on the observer side and the opposite side with the two substrates 111 and 112 interposed therebetween. The The polarizing plate is disposed so as to form a crossed Nicol with the liquid crystal layer interposed therebetween.
The liquid crystal display device 101 constitutes a vertical alignment type passive matrix liquid crystal display device using the vertical alignment mode liquid crystal display panel 110.

  As shown in FIG. 4, a drive IC 104 is disposed on the peripheral edge of the liquid crystal display panel 110 on the substrate 112. As described above, the drive IC 104 has a plurality of output terminals C101 to C106 that sequentially output scanning signals to the plurality of common electrodes 103-1 to 103-6 of the liquid crystal display panel 110.

  The drive IC 104 has a structure in which six output terminals are arranged. However, this is an example, and the present embodiment is not limited to this structure, and the drive IC 104 has a structure in which a larger number of output terminals are arranged. It is possible. Further, the shape of the driving IC 104 and the arrangement structure of the output terminals are not limited to the shape shown in FIG. 4, and various structures can be used as long as the structure has a plurality of output terminals that sequentially output scanning signals. .

  The plurality of wirings CL101 to CL106 arranged on the substrate 112 are connected to the output terminals C101 to C106 of the driving IC 104 at one end portion, respectively. As shown in FIG. 4, the seal portion 105 of the liquid crystal display panel 110 is formed of a conductive member so as to penetrate the seal portion 105, similar to the transfer 15 of the liquid crystal display panel 10 of the first embodiment described above. A transfer 115 is provided. Therefore, each of the plurality of wirings CL101 to CL106 is the end of the common electrodes 103-1 to 103-6 disposed on the substrate 111 through the transfer 115 provided inside the seal portion 105 at the other tip. Connect to the part. In other words, the transfer 115 is a connection portion that electrically connects the common electrode 103 disposed on the substrate 111 and the wirings CL101 to CL106 disposed on the substrate 112.

  Then, as shown in FIG. 4, when a voltage is applied to the liquid crystal layer (not shown) through the common electrode 103 and the segment electrode (not shown), the orientation of the liquid crystal changes and the liquid crystal becomes perpendicular to the electric field. I will try. As a result, the liquid crystal layer is aligned in a direction parallel to the substrates 111 and 112. Due to the orientation change of the liquid crystal layer, in the region where a voltage is applied, the product (Δn · d) of the refractive index anisotropy (Δn) of the liquid crystal and the thickness (d) of the liquid crystal layer is compared with the initial state. The light transmission characteristics determined by the change. In the liquid crystal display device 101 of the present embodiment which is a vertical alignment type, display is performed by utilizing a change in light transmission characteristics at a voltage application portion.

  The liquid crystal display device 101 of the present embodiment having the above configuration applies the voltage corresponding to the image display to the segment electrodes in synchronization with the selection period of the common electrodes 103-1 to 103-6 by the driving IC 104. In addition, the liquid crystal layer in the intersecting region between the common electrodes 103-1 to 103-6 and the segment electrode is urged to change its light transmission characteristics to realize a high-density dot matrix display. Thus, it is possible to display a desired image.

  The liquid crystal display device 101 of the present embodiment is characterized by having a characteristic of high contrast ratio when viewed from the front, a wide viewing angle, and excellent visibility by adopting a vertical alignment type. And the liquid crystal display device 101 of this embodiment can reduce the non-uniformity of display by reducing the flow of liquid crystal induced when multiplex driving is performed. Such an effect is due to a characteristic wiring structure in the liquid crystal display device 101 of the present embodiment. Hereinafter, the wiring structure of the liquid crystal display device 101 of the present embodiment will be further described.

  As shown in FIG. 4, the liquid crystal display device 101 of this embodiment is different from the conventional liquid crystal display device 1000 described above in the connection method of the plurality of wirings CL101 to CL106 that connect the driving IC 104 and the common electrode 103. It has a different arrangement structure of wirings CL101 to CL106 which is different from the liquid crystal display device 1000 or the like.

  That is, as described above, the wirings CL101 to CL106 are connected to the common electrodes 103-1 to 103-6 via the transfer 115, respectively. In the liquid crystal display panel 110 of this embodiment, at least one of the plurality of wirings CL101 to CL106 is connected to another wiring or the common wiring 103 via the seal portion 105 serving as an insulating layer. And is arranged so as to form a crossing portion 120 in a formation region of the seal portion 105 in the panel. Here, the intersecting portion is a portion where the wirings CL101 to CL106 arranged on the substrate 112 and the common electrode arranged on the substrate 111 intersect three-dimensionally and insulated by an insulating sealing material. It is a part that has been. In the part where the transfer 115 is formed, the wiring and the common electrode intersect three-dimensionally, but this part is excluded from the intersection. Therefore, the intersection may be referred to as an insulation intersection.

  For example, as illustrated in FIG. 4, the plurality of common electrodes 103-1 to 103-6 is led out at the left end extending in the horizontal direction. In the plurality of wirings CL101 to CL106, the wiring CL101 is connected to the common electrode 103-1, the wiring CL102 is connected to the common electrode 103-4, the wiring CL103 is connected to the common electrode 103-2, and the wiring CL104 is common. The wiring CL105 is connected to the common electrode 103-3, and the wiring CL106 is connected to the common electrode 103-6.

  At this time, at least a part of the wirings CL101 to CL106 and the common electrodes 103-1 to 103-6 have a structure that bends in the region where the seal portion 105 is formed. For example, the wiring CL103, the wiring CL105, the common electrode 103-4, the common electrode 103-5, and the like have a structure in which a part of the end portion or the like is bent in the formation region of the seal portion 105.

  As a result, as shown in FIG. 4, the crossing portion 120 where the wiring CL103 connected to the common electrode 103-2 and the common electrode 103-4 intersect with each other through the seal portion 105 in the formation region of the seal portion 105 is formed. doing. Similarly, the wiring CL105 connected to the common electrode 103-3 forms an intersection 120 that intersects the common electrode 103-4 and the common electrode 103-5 via the seal portion 105. As described above, the material of the seal portion 105 is insulative and functions as an insulating layer. Accordingly, the crossing portions 120 such as the crossing portion 120 between the wiring CL103 and the common electrode 103-4 only cross three-dimensionally and are insulating crossing portions that are not conductive.

  In the liquid crystal display device 101 having the arrangement structure of the wirings CL101 to CL106 described above, scanning signals are sequentially output from the output terminals C101 to C106 of the driving IC 104 in the order of the output terminals C101 to C106. As a result, after the scanning signal is output to the uppermost common electrode 103-1 among the common electrodes 103-1 to 103-6 arranged in the vertical direction of the liquid crystal display panel 110, the common electrode 103-4, Scan signals are sequentially output in the order of the common electrode 103-2, the common electrode 103-5, the common electrode 103-3, and the common electrode 103-6. That is, the scanning signals are sequentially output from the output terminals C101 to C106 of the driving IC 104 to the common electrodes 103-1 to 103-6, for example, after being output to the common electrode 103-1, the next output is the common electrode. This is done for the common electrode 103-4 separated by two. Next, the common electrode 103-4 and one common electrode are separated from each other and the common electrode 103-2 is arranged.

  Therefore, in the liquid crystal display device 101, after the scanning signals sequentially output from the output terminals C101 to C106 of the driving IC 104 are output to one common electrode among the plurality of common electrodes 103 arranged in the vertical direction, It has a wiring structure that outputs to the next common electrode arranged with one or more common electrodes interposed therebetween. That is, after one common electrode is selected for a plurality of common electrodes 103 and a scanning signal is output from the driving IC 104, the scanning signal output is continued to the one common electrode selected immediately before. The adjacent common electrode 103 is not selected. The other common electrode 103 excluding the common electrode adjacent to the selected one common electrode is selected and a scanning signal is output. For example, in the liquid crystal display device 101 of the present embodiment, the scanning signal output subsequent to the output of the scanning signal to one common electrode 103-1 is performed on the common electrode 103-4, The arrangement structure of the wirings CL101 to CL106 is formed so as not to be performed on the adjacent common electrode 103-2.

  In the liquid crystal display device 101 of this embodiment having such a wiring structure, even if a flow of liquid crystal (not shown) is induced by the selection of one common electrode, the subsequent selection of the common electrode is not performed by the adjacent common electrode. Since it is performed at a place isolated by sandwiching one or more common electrodes, the flow of the generated liquid crystal is not promoted. As a result, in the vertical alignment type liquid crystal display device 101, the flow of liquid crystal induced when multiplex driving is performed can be reduced, and display unevenness can be reduced. In the present embodiment, the conductive member in which the transfer 115 of the seal portion 105 is locally disposed has been described. However, the seal portion itself may be made of an anisotropic conductive material so that conduction between the upper and lower sides is possible. In this case, if an insulating film is formed on the common electrode and wiring arranged on each substrate and an opening of the insulating film is provided only at the transfer part, vertical conduction is possible at the transfer part, and insulation is provided between the upper and lower parts at the intersection. Become.

[Embodiment 3]
FIG. 5 is a plan view schematically illustrating the structure of the liquid crystal display device according to the third embodiment of the present invention.

  A liquid crystal display device 201 of this embodiment shown in FIG. 5 is arranged on a liquid crystal display panel 210 in a vertical alignment mode and a flexible printed circuit board 221 connected to the liquid crystal display panel 210, and sequentially receives scanning signals from a plurality of output terminals. The driving IC 204 for outputting and a plurality of wirings CL201 to CL206 for connecting the common electrode 203 of the liquid crystal display panel 210 and the driving IC 204 are provided.

  The liquid crystal display panel 210 has the same structure as the liquid crystal display panel 10 of the first embodiment described above, except that the wiring drawing structure from the common electrode 203 is different. The liquid crystal display device 201 has a structure in which a flexible printed board 221 is connected to the liquid crystal display panel 210 as described above. The printed circuit board 221 is connected to the liquid crystal display panel 210 on the one hand, and is connected to the printed circuit board 222 made of a rigid plate on which a drive circuit (not shown) of the liquid crystal display device 201 is formed. The driving IC 204 is placed on the printed board 221, and a part of the wirings CL 201 to CL 206 that connect the common electrode 203 and the driving IC 204 of the liquid crystal display panel 210 are arranged on the printed board 221. Is disposed on the liquid crystal display panel 210.

  As shown in FIG. 5, the liquid crystal display panel 210 of the liquid crystal display device 201 of this embodiment includes a transparent substrate 211 disposed on the viewer (not shown) side, and an observer facing the substrate 211. A liquid crystal layer (not shown) is sandwiched between the transparent substrate 212 disposed on the opposite side. A seal portion 205 is provided around the liquid crystal layer, and fixes the substrate 211 and the substrate 212 that sandwich the liquid crystal layer to each other. The liquid crystal layer of the liquid crystal display panel 210 is made of nematic liquid crystal. In the liquid crystal display device 201 of this embodiment, the liquid crystal layer is a liquid crystal layer having negative dielectric anisotropy (Δε) that is aligned so that the initial alignment state is substantially perpendicular (vertical alignment) to the substrate. Is possible. In that case, the liquid crystal display panel 210 is in the vertical alignment mode as described above.

As shown in FIG. 5, a plurality of common electrodes 203 and a plurality of segment electrodes (not shown) are arranged on the inner surfaces of the two substrates 211 and 212 sandwiching the liquid crystal layer.
A vertical alignment mode liquid crystal display panel 210 shown in FIG. 5 extends in the vertical direction (column direction) so as to intersect the common electrode 203 and a plurality of elongated strip-shaped common electrodes 203 extending in the horizontal direction (row direction). A plurality of segment electrodes (not shown). The common electrode 203 is disposed on the substrate 211, and the segment electrode (not shown) is disposed on the substrate 212. The common electrode 203 and the segment electrode are formed by patterning a transparent conductive film made of a transparent conductive material such as ITO, for example.

  As shown in FIG. 5, each of the plurality of common electrodes 203-1 to 203-6 has, for example, a shape extending in the horizontal direction, and one end portion of the both ends is used, and each wiring is taken out. Has a structure to be performed. In the liquid crystal display panel 210 shown in FIG. 5, in the common electrodes 203-1, 203-2, 203-3, wiring is taken out at the left end from the observer, and the common electrodes 203-4, 203-5 are taken out. , 203-6, the wiring is taken out at the right end from the observer.

  The liquid crystal display panel 210 shown in FIG. 5 has a structure in which the common electrode 203 extends in the horizontal direction. However, in the present embodiment, the structure is not limited to this structure, and the common electrode of the liquid crystal display panel 210 is in the vertical direction (column direction). It is also possible to have a structure extending in the direction. In that case, the segment electrode has a structure extending in the horizontal direction (row direction).

  Further, as shown in FIG. 5, the liquid crystal display panel 210 has a structure in which six common electrodes 203 are arranged. However, this is an example, and in the present embodiment, the liquid crystal display panel 210 is not limited to such a structure. Can have a structure in which a larger number of common electrodes 203 are arranged.

In the liquid crystal display panel 210, an alignment film (not shown) that realizes uniform initial alignment of liquid crystal is provided between the common electrode 203 and the segment electrode on each substrate 211, 212 and the liquid crystal layer. On the outer surface of the two substrates 211 and 212 facing each other with the liquid crystal layer interposed therebetween, a pair of polarizing plates (not shown) are disposed on the observer side and the opposite side with the two substrates 211 and 212 interposed therebetween. The The polarizing plate is disposed so as to form a crossed Nicol with the liquid crystal layer interposed therebetween.
The liquid crystal display device 201 constitutes a vertical alignment type passive matrix liquid crystal display device using a vertical alignment mode liquid crystal display panel 210.

  As shown in FIG. 5, a flexible printed circuit board 221 is connected to the end of the liquid crystal display panel 210, and a drive IC 204 is disposed on the printed circuit board 221. As described above, the drive IC 204 has a plurality of output terminals C201 to C206 that sequentially output scanning signals to the plurality of common electrodes 203-1 to 203-6 of the liquid crystal display panel 210.

  The drive IC 204 has a structure in which six output terminals are arranged. However, this is an example, and the present embodiment is not limited to this structure, and the drive IC 204 has a structure in which a larger number of output terminals are arranged. It is possible. Further, the shape of the driving IC 204 and the arrangement structure of the output terminals are not limited to the shape shown in FIG. 5, and various structures can be used as long as the structure has a plurality of output terminals that sequentially output scanning signals. .

  Then, each of the plurality of wirings CL201 to CL206 is connected to the output terminals C201 to C206 of the driving IC 204 at one end portion. As shown in FIG. 5, the seal portion 205 of the liquid crystal display panel 210 is formed of a conductive member so as to penetrate the seal portion 205, similar to the transfer 15 of the liquid crystal display panel 10 of the first embodiment described above. A transfer 215 is provided. Therefore, each of the plurality of wirings CL201 to CL206 is connected to the end portions of the common electrodes 203-1 to 203-6 via the transfer 215 provided inside the seal portion 205 at the other end portion.

  Then, as shown in FIG. 5, when a voltage is applied to the liquid crystal layer (not shown) through the common electrode 203 and the segment electrode (not shown), the orientation of the liquid crystal changes, and the liquid crystal becomes perpendicular to the electric field. I will try. As a result, the liquid crystal layer is aligned in a direction parallel to the substrates 211 and 212. Due to the orientation change of the liquid crystal layer, in the region where a voltage is applied, the product (Δn · d) of the refractive index anisotropy (Δn) of the liquid crystal and the thickness (d) of the liquid crystal layer is compared with the initial state. The light transmission characteristics determined by the change. In the liquid crystal display device 201 of the present embodiment which is a vertical alignment type, display is performed by utilizing a change in light transmission characteristics in a voltage application portion.

  The liquid crystal display device 201 of the present embodiment having the above configuration applies a voltage corresponding to image display to the segment electrodes in synchronization with the selection period of the common electrodes 203-1 to 203-6 by the driving IC 204. In addition, the liquid crystal layer in the intersection region between the common electrodes 203-1 to 203-6 and the segment electrode is urged to change its orientation and change the light transmission characteristics, and the change is used to realize a high-density dot matrix display. Thus, it is possible to display a desired image.

  The liquid crystal display device 201 of the present embodiment is characterized by having a high contrast ratio when viewed from the front, a wide viewing angle, and excellent visibility by being a vertical alignment type. And the liquid crystal display device 201 of this embodiment can reduce the non-uniformity of display by reducing the flow of liquid crystal induced when multiplex driving is performed. Such an effect is due to a characteristic wiring structure in the liquid crystal display device 201 of the present embodiment. Hereinafter, the wiring structure of the liquid crystal display device 201 of this embodiment will be further described.

  As shown in FIG. 5, the liquid crystal display device 201 of the present embodiment is different from the conventional liquid crystal display device 1000 described above in the connection method of a plurality of wirings CL201 to CL206 that connect the driving IC 204 and the common electrode 203. The wirings CL201 to CL206 have a different arrangement structure from the liquid crystal display device 1000 and the like.

  That is, as described above, the wirings CL201 to CL206 connect the common electrode 203 and the driving IC 204 of the liquid crystal display panel 210, but a part thereof is disposed on the printed board 221. In the liquid crystal display device 201 of the present embodiment, at least one of the plurality of wirings CL201 to CL206 intersects with other wirings via the printed circuit board 221 serving as an insulating layer, and an intersection is formed on the printed circuit board 221. Arranged to form. The intersection formed on the printed circuit board 221 is formed on the upper surface of the printed circuit board 221 by part of the wiring passing through the back surface of the printed circuit board 221 through the through hole 223 provided on the printed circuit board 221. It is formed by crossing the wiring.

  For example, as shown in FIG. 5, the plurality of common electrodes 203-1 to 203-6 are drawn out at the left end where the common electrodes 203-1 to 203-3 extend in the horizontal direction, and the common electrodes 203-4 to 203-6 is pulled out at the right end extending in the horizontal direction. In the plurality of wirings CL201 to CL206, the wiring CL201 is connected to the common electrode 203-1, the wiring CL202 is connected to the common electrode 203-2, the wiring CL203 is connected to the common electrode 203-3, and the wiring CL204 is common. The wiring CL205 is connected to the common electrode 203-5, and the wiring CL206 is connected to the common electrode 203-6.

  At this time, for example, as shown in FIG. 5, the wiring CL203 connected to the common electrode 203-3 wraps around the back surface of the printed board 221 using the through hole 223. The wiring CL 203 forms an intersecting portion that intersects with the wiring CL 206 on the printed board 221 via the printed board 221. Similarly, the wiring CL204 connected to the common electrode 203-4 forms an intersection where the wirings CL202, CL203, CL205, and CL206 intersect with the printed circuit board 221. The printed circuit board 221 is insulative and functions as an insulating layer. Accordingly, at any intersection such as the intersection between the wiring CL203 and the wiring CL206, the upper and lower wirings are insulated through the printed circuit board 221, and the upper and lower wirings do not conduct. The through hole 223 has the same function as that of the transfer 115 in the second embodiment, and is a part where the upper and lower wirings intersect, but since the upper and lower wirings are conductive, The crossing portion (insulating crossing portion) in the specification has a different definition.

  By providing the intersection as described above, in the liquid crystal display device 201 of this embodiment, the wiring CL201 is connected to the output terminal C201 of the driving IC 204, the wiring CL202 is connected to the output terminal C203 of the driving IC 204, and the wiring CL203 is Connected to the output terminal C205 of the driving IC 204, the wiring CL204 is connected to the output terminal C202 of the driving IC 204, the wiring CL205 is connected to the output terminal C204 of the driving IC 204, and the wiring CL206 is connected to the output terminal C206 of the driving IC 204.

  In the liquid crystal display device 201 having the above wiring structure, scanning signals are sequentially output from the output terminals C201 to C206 of the drive IC 204 in the order of the output terminals C201 to C206. As a result, after the scanning signal is output to the uppermost common electrode 203-1 among the common electrodes 203-1 to 203-6 arranged in the vertical direction of the liquid crystal display panel 210, the common electrode 203-4, Scan signals are sequentially output in the order of the common electrode 203-2, the common electrode 203-5, the common electrode 203-3, and the common electrode 203-6.

  That is, the scanning signals are sequentially output from the output terminals C201 to C206 of the driving IC 204 to the common electrodes 203-1 to 203-6. For example, after the signals are output to the common electrode 203-1, the next output is common. The common electrode 203-4 is separated from the common electrode 203-4, and then the common electrode 203-4 is separated from the common electrode 203-4. Become.

  Therefore, in the liquid crystal display device 201 shown in FIG. 5, the scanning signals sequentially output from the output terminals C201 to C206 of the drive IC 204 have a plurality of shapes extending in the horizontal direction and arranged in the vertical direction. After being output to one of the common electrodes, the wirings CL201 to CL206 are arranged so as to be outputted to the next common electrode arranged with one or more common electrodes interposed therebetween. That is, after one common electrode is selected for the plurality of common electrodes 203 and the scanning signal is output from the driving IC 204, the next scanning signal output is the common adjacent to the common electrode selected immediately before. No electrode is selected. The other common electrode 203 excluding the common electrode adjacent to the selected one common electrode is selected and a scanning signal is output. For example, in the liquid crystal display device 201 of this embodiment, the scanning signal output subsequent to the output of the scanning signal to one common electrode 203-1 is performed on the common electrode 203-4, and the common electrode 203-1 is output. The arrangement structure of the wirings CL201 to CL206 is formed so as not to be performed on the adjacent common electrode 203-2.

  In the liquid crystal display device 201 of this embodiment having such a wiring structure, even if a flow of liquid crystal (not shown) is induced by the selection of one common electrode, the subsequent selection of the common electrode is not performed by the adjacent common electrode. Since the process is performed at a location isolated by sandwiching one common electrode, the flow of the generated liquid crystal is not promoted. As a result, in the vertical alignment type liquid crystal display device 201, the flow of liquid crystal induced when multiplex driving is performed can be reduced, and display unevenness can be reduced.

[Embodiment 4]
FIG. 6 is a plan view schematically illustrating the structure of the liquid crystal display device according to the fourth embodiment of the present invention.

A liquid crystal display device 301 of this embodiment shown in FIG. 6 is disposed on a vertical alignment mode liquid crystal display panel 210 and a printed circuit board 322 connected to the liquid crystal display panel 210, and sequentially outputs scanning signals from a plurality of output terminals. The driving IC 204 includes a plurality of wirings CL301 to CL306 that connect the common electrode 203 of the liquid crystal display panel 210 and the driving IC 204.
The printed circuit board 322 is made of a rigid plate-like body, on which a drive circuit (not shown) for the liquid crystal display device 301 is formed. The printed circuit board 322 has a structure connected to the liquid crystal display panel 210 via a flexible printed circuit board 321 connected to the liquid crystal display panel 210.

  The liquid crystal display device 301 has the same structure as the liquid crystal display device 201 of the third embodiment described above except that the structures of the wirings CL301 to CL306 are different because the driving IC 204 is disposed on the printed circuit board 322. The liquid crystal display device 301 constitutes a vertical alignment type passive matrix liquid crystal display device having a vertical alignment mode liquid crystal display panel 210. Therefore, in FIG. 6, the same reference numerals are used for the same components as those of the liquid crystal display device 201 of the third embodiment, and duplicate descriptions are omitted.

  As described above, the liquid crystal display device 301 has a structure in which the printed circuit board 322 on which the driving IC 204 is placed is connected to the liquid crystal display panel 210 via the flexible printed circuit board 321. Therefore, a part of the wirings CL301 to CL306 for connecting the common electrode 203 of the liquid crystal display panel 210 and the driving IC 204 is arranged on the printed circuit board 322 and the flexible printed circuit board 321, and the other part is on the upper surface of the liquid crystal display panel 210. Is arranged.

  Then, each of the plurality of wirings CL301 to CL306 is connected to the output terminals C201 to C206 of the driving IC 204 at one end portion. As shown in FIG. 6, the seal portion 205 of the liquid crystal display panel 210 is formed of a conductive member so as to penetrate the seal portion 205, similar to the transfer 15 of the liquid crystal display panel 10 of the first embodiment described above. A transfer 215 is provided. Therefore, each of the plurality of wirings CL201 to CL206 is connected to the end portions of the common electrodes 203-1 to 203-6 via the transfer 215 provided inside the seal portion 205 at the other end portion.

  Then, as shown in FIG. 6, when a voltage is applied to the liquid crystal layer (not shown) through the common electrode 203 and the segment electrode (not shown), the orientation of the liquid crystal changes and the liquid crystal becomes perpendicular to the electric field. I will try. As a result, the liquid crystal layer is aligned in a direction parallel to the substrates 211 and 212. Due to the orientation change of the liquid crystal layer, in the region where a voltage is applied, the product (Δn · d) of the refractive index anisotropy (Δn) of the liquid crystal and the thickness (d) of the liquid crystal layer is compared with the initial state. The light transmission characteristics determined by the change. In the liquid crystal display device 301 of the present embodiment which is a vertical alignment type, display is performed by utilizing a change in light transmission characteristics at a voltage application portion.

  The liquid crystal display device 301 of the present embodiment having the above configuration applies a voltage corresponding to image display to the segment electrodes in synchronization with the selection period of the common electrodes 203-1 to 203-6 by the drive IC 204. In addition, the liquid crystal layer in the intersection region between the common electrodes 203-1 to 203-6 and the segment electrode is urged to change its orientation and change the light transmission characteristics, and the change is used to realize a high-density dot matrix display. Thus, it is possible to display a desired image.

  The liquid crystal display device 301 of the present embodiment is characterized by having a high contrast ratio when viewed from the front, a wide viewing angle, and excellent visibility by adopting a vertical alignment type. And the liquid crystal display device 301 of this embodiment can reduce the non-uniformity of display by reducing the flow of liquid crystal induced when multiplex driving is performed. Such an effect is due to a characteristic wiring structure in the liquid crystal display device 301 of the present embodiment. Hereinafter, the wiring structure of the liquid crystal display device 301 of the present embodiment will be further described.

  As shown in FIG. 6, the liquid crystal display device 301 of this embodiment is different from the conventional liquid crystal display device 1000 described above in the connection method of the plurality of wirings CL301 to CL306 that connect the driving IC 204 and the common electrode 203. The wirings CL301 to CL306 have different arrangement structures.

  That is, as described above, the wirings CL301 to CL306 connect the common electrode 203 and the driving IC 204 of the liquid crystal display panel 210, but a part thereof is disposed on the printed board 322. In the liquid crystal display device 301 of the present embodiment, at least one of the plurality of wirings CL301 to CL306 intersects with other wirings via the printed circuit board 322 serving as an insulating layer, and an intersection is formed on the printed circuit board 322. Configured to form. The intersection formed on the printed circuit board 322 is formed on the upper surface of the printed circuit board 322 by passing a part of the wiring around the back surface of the printed circuit board 322 through the through hole 323 provided on the printed circuit board 322. It is formed by crossing the wiring.

  For example, as shown in FIG. 6, the plurality of common electrodes 203-1 to 203-6 has a wiring drawn out at the left end where the common electrodes 203-1 to 203-3 extend in the horizontal direction, and the common electrode 203-1 The wiring is drawn out at the right end where 4 to 203-6 extends in the horizontal direction. In the plurality of wirings CL301 to CL306, the wiring CL301 is connected to the common electrode 203-1, the wiring CL302 is connected to the common electrode 203-2, the wiring CL303 is connected to the common electrode 203-3, and the wiring CL304 is common. The wiring CL305 is connected to the common electrode 203-5, and the wiring CL306 is connected to the common electrode 203-6.

  At this time, for example, as shown in FIG. 6, the wiring CL 303 connected to the common electrode 203-3 wraps around the back surface of the printed board 322 using the through hole 323. The wiring CL 303 forms an intersecting portion that intersects the wiring CL 306 on the printed board 322 via the printed board 322. Similarly, the wiring CL304 connected to the common electrode 203-4 forms an intersection where the wirings CL302, CL303, CL305, and CL306 intersect with each other through the printed board 322. The printed circuit board 322 is insulative and functions as an insulating layer. Therefore, no conduction occurs at any intersection such as the intersection between the wiring CL303 and the wiring CL306.

  By providing the intersection as described above, in the liquid crystal display device 301 of this embodiment, the wiring CL301 is connected to the output terminal C201 of the driving IC 204, the wiring CL302 is connected to the output terminal C203 of the driving IC 204, and the wiring CL303 is Connected to the output terminal C205 of the driving IC 204, the wiring CL304 is connected to the output terminal C202 of the driving IC 204, the wiring CL305 is connected to the output terminal C204 of the driving IC 204, and the wiring CL306 is connected to the output terminal C206 of the driving IC 204.

  In the liquid crystal display device 301 having the above wiring structure, scanning signals are sequentially output from the output terminals C201 to C206 of the drive IC 204 in the order of the output terminals C201 to C206. As a result, among the common electrodes 203-1 to 203-6 arranged in the vertical direction of the liquid crystal display panel 210, a scanning signal is first output to the uppermost common electrode 203-1 and then the common electrode 203-4. The scanning signals are sequentially output in the order of the common electrode 203-2, the common electrode 203-5, the common electrode 203-3, and the common electrode 203-6. That is, the scanning signals are sequentially output from the output terminals C201 to C206 of the driving IC 204 to the common electrodes 203-1 to 203-6. For example, after the signals are output to the common electrode 203-1, the next output is common. The common electrode 203-4 is separated from the common electrode 203-4, and then the common electrode 203-4 is separated from the common electrode 203-4. Become.

  Therefore, in the liquid crystal display device 301 shown in FIG. 6, the scanning signals sequentially output from the output terminals C201 to C206 of the driving IC 204 are output to one common electrode among the plurality of common electrodes 203 arranged in the vertical direction. After that, the wiring structure is output to the next common electrode arranged with one or more common electrodes interposed therebetween. That is, after one common electrode is selected for the plurality of common electrodes 203 and the scanning signal is output from the driving IC 204, the next scanning signal output is the common adjacent to the common electrode selected immediately before. The electrode 203 is never selected. The other common electrode 203 excluding the common electrode adjacent to the selected one common electrode is selected and a scanning signal is output. For example, in the liquid crystal display device 201 of this embodiment, the scanning signal output subsequent to the output of the scanning signal to one common electrode 203-1 is performed on the common electrode 203-4, and the common electrode 203-1 is output. The arrangement structure of the wirings CL301 to CL306 is formed so as not to be performed on the adjacent common electrode 203-2.

  In the liquid crystal display device 301 of this embodiment having such a wiring structure, even if the flow of liquid crystal (not shown) is induced by the selection of one common electrode, the subsequent selection of the common electrode is not performed by the adjacent common electrode. Since the process is performed at a location isolated by sandwiching one common electrode, the flow of the generated liquid crystal is not promoted. As a result, in the vertical alignment type liquid crystal display device 301, the flow of liquid crystal induced when multiplex driving is performed can be reduced, and display unevenness can be reduced.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

1, 101, 201, 301, 1000, 1000-1 Liquid crystal display device 3, 3-1, 3-2, 3-3, 3-4, 3-5, 3-6, 103, 103-1, 103- 2, 103-3, 103-4, 103-5, 103-6, 203, 203-1, 203-2, 203-3, 203-4, 203-5, 203-6, 1003, 1003-1, 1003-2, 1003-3, 1003-4, 1003-5, 1003-6 Common electrode 4, 104, 204, 1004 Drive IC
5, 105, 205, 1005 Sealing part 10, 110, 210, 1001 Liquid crystal display panel 11, 12, 111, 112, 211, 212, 1011, 1012 Substrate 13 Liquid crystal layer 14, s1, s2, s3, s4, s5 s6, s7 Segment electrode 15, 115, 215 Transfer 120 Crossing 221, 222, 321, 322 Printed circuit board 223, 323 Through hole C1, C2, C3, C4, C5, C6, C101, C102, C103, C104, C105, C106, C201, C202, C203, C204, C205, C206, C1001, C1002, C1003, C1004, C1005, C1006 Output terminals CL1, CL2, CL3, CL4, CL5, CL6, CL101, CL102, CL103, CL1 4, CL105, CL106, CL201, CL202, CL203, CL204, CL205, CL206, CL301, CL302, CL303, CL304, CL305, CL306, CL1001, CL1002, CL1003, CL1004, CL1005, CL1006 wiring

Claims (6)

A liquid crystal display panel having a plurality of common electrodes extending in the horizontal direction or the vertical direction and segment electrodes extending in the vertical direction or the horizontal direction so as to intersect the common electrodes;
A driving IC having a plurality of output terminals and outputting a scanning signal to each of the plurality of common electrodes;
A liquid crystal display device having a plurality of wirings connecting the common electrode of the liquid crystal display panel and an output terminal of the drive IC;
The plurality of common electrodes are configured such that a plurality of first common electrodes and second common electrodes, which are different from each other in the direction of wiring extraction, are alternately arranged one by one,
The wiring is arranged so that the scanning signal from the driving IC is output to each of the plurality of second common electrodes after being output to each of the plurality of first common electrodes. A liquid crystal display device. A liquid crystal display panel having a plurality of common electrodes extending in the horizontal direction or the vertical direction and segment electrodes extending in the vertical direction or the horizontal direction so as to intersect the common electrodes;
A driving IC having a plurality of output terminals and outputting a scanning signal to each of the plurality of common electrodes;
A liquid crystal display device having a plurality of wirings connecting the common electrode of the liquid crystal display panel and an output terminal of the drive IC;
The plurality of wirings are arranged so that at least one of the plurality of wirings crosses the other common wiring or the common electrode connected to the other wiring via an insulating layer,
The liquid crystal display characterized in that the output of the scanning signal from the driving IC is performed on the common electrode excluding the common electrode adjacent to the common electrode to which the scanning signal was output immediately before. apparatus. The drive IC is disposed on the liquid crystal display panel,
The liquid crystal display device according to claim 2, wherein the intersecting portion is formed on the liquid crystal display panel. The drive IC is disposed on a printed circuit board connected to the liquid crystal display panel,
3. The liquid crystal display device according to claim 2, wherein a part of the plurality of wirings is disposed on the printed circuit board, and the intersecting portion is formed on the printed circuit board.   The liquid crystal display device according to claim 4, wherein the printed circuit board is a flexible printed circuit board.   The liquid crystal display according to claim 1, wherein the liquid crystal display panel is a vertical alignment type liquid crystal display panel configured by sandwiching a vertically aligned liquid crystal between a pair of substrates. Display device.

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