JP2010250014A - Liquid crystal display device and method for manufacturing liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device excelling in display quality, and to provide a method for manufacturing the liquid crystal display device. <P>SOLUTION: The liquid crystal display device includes: an array substrate that has a plurality of signals lines 20, a plurality of scanning lines 15, a plurality of switching elements and a plurality of pixel electrodes; a counter substrate that has a common electrode; a liquid crystal layer; a scanning line-driving circuit 30 supplying the plurality of scanning lines with driving signals; a scanning line control circuit 40 controlling the scanning line-driving circuit to supply the plurality of scanning lines with the driving signals to turn on all of the plurality of switching elements; an image signal output section for supplying the plurality of signal lines with image signals; and a signal line control circuit 60 for supplying the plurality of signal lines simultaneously with a common signal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device and a method for manufacturing a liquid crystal display device.

  In recent years, for example, a liquid crystal display device including a liquid crystal display panel has been used as an image display device for displaying an image. The liquid crystal display panel includes an array substrate having a glass substrate. On the glass substrate, a plurality of signal lines and a plurality of scanning lines are arranged to intersect each other. Pixels are formed in regions surrounded by signal lines and scanning lines. Each pixel has a thin film transistor (hereinafter referred to as TFT) provided at each intersection of a signal line and a scanning line, and a pixel electrode connected to the TFT.

  The liquid crystal display panel further includes a counter substrate and a liquid crystal layer. The counter substrate has another glass substrate and a common electrode formed on the other glass substrate. The liquid crystal layer is sandwiched between an array substrate and a counter substrate that are arranged to face each other while maintaining a gap.

  The plurality of scanning lines are connected to a scanning line driving circuit, and the plurality of signal lines are connected to a 1/3 multiplexer circuit (see, for example, Patent Document 1). Further, an FDON circuit is connected to each of the plurality of scanning lines and the plurality of signal lines, and a common FDON signal is supplied to both the FDON circuits.

  The FDON circuit connected to the scanning line turns on all the TFTs. The FDON circuit connected to the signal line applies the same voltage as the common electrode (hereinafter referred to as a common electrode voltage) to all the signal lines. For this reason, by driving both FDON circuits at the time of power-on and power-off, the potential difference between all the pixel electrodes and the common electrode can be set to 0 V (all the pixels are off), and the afterimage can be suppressed.

JP 2005-49849 A

  By the way, in the above liquid crystal display device, the pixels can be divided into several groups (within the frame time) and the dynamic drive for sequentially giving the video signal for each group is possible. Driving (simple driving) is not possible. For this reason, in the liquid crystal display device, a potential difference cannot be generated between all the pixel electrodes and the common electrode at the same time (all the pixels are turned on).

Thereby, in the liquid crystal display device by dynamic drive, there is a problem that basic evaluation such as TV characteristics (transmittance characteristics with respect to voltage), response speed, and optical characteristics cannot be evaluated by static drive (simple drive). is there. On the other hand, in a liquid crystal display device by static drive, these evaluations can be performed with a relatively simple inspection facility (device). From the above, it is desirable to perform a static drive (simple drive) inspection in a liquid crystal display device by dynamic drive to determine whether the liquid crystal display device is excellent in display quality.
The present invention has been made in view of the above points, and an object thereof is to provide a liquid crystal display device excellent in display quality and a method for manufacturing the liquid crystal display device.

In order to solve the above-described problem, a liquid crystal display device according to an aspect of the present invention includes:
A plurality of signal lines, a plurality of scanning lines crossing the plurality of signal lines, a plurality of switching elements electrically connected to the plurality of signal lines and the plurality of scanning lines, and electrically connected to the plurality of switching elements An array substrate having a plurality of pixel electrodes formed,
A counter substrate having a common electrode facing the plurality of pixel electrodes;
A liquid crystal layer sandwiched between the array substrate and the counter substrate;
A scanning line driving circuit electrically connected to the plurality of scanning lines and supplying a driving signal to the plurality of scanning lines;
A scanning line control circuit that is electrically connected to the scanning line driving circuit and controls the scanning line driving circuit to give the driving signals to the plurality of scanning lines to turn on all of the plurality of switching elements;
A video signal output unit connected to the plurality of signal lines and providing a video signal to the plurality of signal lines;
A signal line control circuit which is connected to the plurality of signal lines and simultaneously applies a common signal to the plurality of signal lines.

In addition, a method for manufacturing a liquid crystal display device according to another aspect of the present invention includes:
A plurality of signal lines, a plurality of scanning lines crossing the plurality of signal lines, a plurality of switching elements electrically connected to the plurality of signal lines and the plurality of scanning lines, and electrically connected to the plurality of switching elements An array substrate having a plurality of pixel electrodes, a counter substrate having a common electrode facing the plurality of pixel electrodes, a liquid crystal layer sandwiched between the array substrate and the counter substrate, and the plurality of scanning lines A scanning line driving circuit that is electrically connected to the plurality of scanning lines and applies a driving signal to the plurality of scanning lines; and the driving signal that is electrically connected to the scanning line driving circuit and that turns on the plurality of switching elements. A scanning line control circuit that controls the scanning line driving circuit to be applied to the scanning lines, a signal line control circuit that is connected to the plurality of signal lines and simultaneously applies a common signal to the plurality of signal lines, and A first wiring that is electrically connected to the through electrode and applies a common voltage to the common electrode; and is electrically connected to the signal line control circuit and is connected to the plurality of signal lines via the signal line control circuit. A liquid crystal display device including a second wiring electrically connected;
A common electrode voltage is applied to the common electrode through the first wiring, the drive signal is applied to the plurality of scanning lines to turn on the plurality of switching elements, and the second wiring and the signal line control circuit are used. A common signal is simultaneously applied to the plurality of signal lines to cause a potential difference between the plurality of pixel electrodes and the common electrode,
After the potential difference is generated, the first wiring and the second wiring are connected by connection means, the potential of the second wiring is set to the same potential as the first wiring,
After the liquid crystal display device is prepared, a video signal output unit that applies a video signal to the plurality of signal lines is connected to the plurality of signal lines.

  According to the present invention, it is possible to provide a liquid crystal display device excellent in display quality and a method for manufacturing the liquid crystal display device.

1 is a schematic configuration diagram illustrating a liquid crystal display device according to an embodiment of the present invention. It is a perspective view which shows a part of liquid crystal display panel and backlight unit of the said liquid crystal display device. It is a schematic block diagram of the said liquid crystal display device. FIG. 3 is an enlarged plan view showing a part of the array substrate shown in FIGS. 1 and 2. FIG. 5 is a cross-sectional view taken along line AA of the array substrate shown in FIG. 4. FIG. 5 is a cross-sectional view of the array substrate shown in FIG. 4 taken along line BB. It is sectional drawing which shows a part of said liquid crystal display panel. It is an expanded sectional view showing a part of the above-mentioned liquid crystal display panel, and is a schematic diagram showing the orientation state of liquid crystal molecules especially when no voltage is applied to the liquid crystal layer. It is an enlarged plan view showing the outside of the display area of the array substrate, and particularly shows a scanning line driving circuit and a scanning line control circuit. It is an enlarged plan view showing the outside of the display area of the array substrate, and particularly shows a switching circuit. It is an enlarged plan view showing the outside of the display area of the array substrate, and more particularly a signal line control circuit. In the manufacturing process of the said liquid crystal display device, it is a schematic block diagram of the liquid crystal display device in the process using static drive.

Hereinafter, a liquid crystal display device according to an embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 11, the liquid crystal display device includes a liquid crystal display panel P, a backlight unit B, a signal line driving circuit 90 as a video signal output unit, a control unit 100, and an FPC (flexible printed circuit). 110).

  The liquid crystal display panel P includes an array substrate 1, a counter substrate 2 disposed opposite to the array substrate, a liquid crystal layer 3 sandwiched between the array substrate and the counter substrate, a color filter 4, a first polarizing plate 8, And a second polarizing plate 9. The liquid crystal display panel P has a display region R1 in which the array substrate 1 and the counter substrate 2 overlap.

  The array substrate 1 includes, for example, a rectangular glass substrate 10 as a transparent insulating substrate. In the display region R1, a plurality of scanning lines 15 and a plurality of signal lines 20 are formed on the glass substrate 10. The scanning line 15 and the signal line 20 are formed so as to cross each other. In the display region R <b> 1, a plurality of auxiliary capacitance lines 18 parallel to the scanning lines 15 are formed on the glass substrate 10. In this embodiment, a pixel 11 is formed in each region surrounded by two adjacent signal lines 20 and two adjacent auxiliary capacitance lines 18. These pixels 11 are arranged in a matrix in the display region R1.

Next, one pixel 11 is taken out and described in detail.
The pixel 11 includes a TFT 12 as a switching element formed in the vicinity of the intersection of the scanning line 15 and the signal line 20, a pixel electrode 26 connected to the TFT, and an auxiliary capacitance element 17 connected to the pixel electrode. Have. The TFT 12 includes a semiconductor layer 13 and a gate electrode 16.

  A semiconductor layer 13 is formed on the glass substrate 10, and a gate insulating film 14 is formed on the glass substrate and the semiconductor layer. The scanning electrode 15 and the gate electrode 16 extending from a part of the scanning line are formed on the gate insulating film 14. The gate electrode 16 faces the semiconductor layer 13. An interlayer insulating film 19 is formed on the gate insulating film 14 and the gate electrode 16.

  A signal line 20 and a contact wiring 21 are formed on the interlayer insulating film 19, and the signal line and the contact wiring pass through part of the gate insulating film 14 and the interlayer insulating film 19 and are connected to the semiconductor layer 13. . Here, the signal line 20 is connected to the source region RS of the semiconductor layer 13, and the contact wiring 21 is connected to the drain region RD of the semiconductor layer 13.

  Next, the auxiliary capacitance element 17 will be described. The auxiliary capacitance line 18 and the auxiliary capacitance electrode 22 are arranged opposite to each other with the gate insulating film 14 interposed therebetween, thereby forming the auxiliary capacitance element 17. Specifically, on the glass substrate 10, island-shaped auxiliary capacitance electrodes 22 formed in the same process as the semiconductor layer 13 are arranged. An auxiliary capacitance line 18 made of, for example, the same material as the scanning line 15 is formed on the auxiliary capacitance electrode 22 via the gate insulating film 14.

  The auxiliary capacitance electrode 22 includes a connection wiring 23 integrated with the auxiliary capacitance electrode, and is electrically connected to the contact wiring 21. The contact wiring 21 extends to above the auxiliary capacitance element 17 and is electrically connected to the pixel electrode 26 on the auxiliary capacitance element 17.

  A protective insulating film 24 is formed on the glass substrate 10 on which the TFT 12 and the auxiliary capacitance element 17 are formed. A plurality of pixel electrodes 26 are formed on the protective insulating film 24. The pixel electrode 26 is formed by overlapping the periphery of two adjacent signal lines 20 and two adjacent auxiliary capacitance lines 18. The pixel electrode 26 is connected to the contact wiring 21 through a contact hole h 1 formed in the protective insulating film 24. The pixel electrode 26 is made of a transparent conductive material such as ITO (indium tin oxide).

  On the pixel electrode 26, for example, a columnar spacer 27 is formed as a spacer. Although not all shown, a plurality of columnar spacers 27 are formed on the pixel electrode 26 at a predetermined density. An alignment film 28 is formed on the protective insulating film 24 and the pixel electrode 26. In this embodiment, the alignment film 28 is a vertical alignment film.

  In the liquid crystal layer 3, PSA (Polymer Sustained Alignment) is formed as liquid crystal molecular alignment maintenance. This PSA gives an arbitrary pretilt angle to liquid crystal molecules.

  A scanning line driving circuit 30, a scanning line control circuit (FDON circuit) 40, a switching circuit 50, a signal line control circuit (FDON circuit) 60, and an OLB pad group 70 are formed on the glass substrate 10 outside the display region R1. ing. In addition, a signal line driving circuit 90 is mounted (COG mounting) on the glass substrate 10 outside the display region R1.

  As shown in FIGS. 3 and 9, the scanning line driving circuit 30 is electrically connected to the plurality of scanning lines 15. The scanning line driving circuit 30 includes a plurality of shift registers 31 and a plurality of buffers 32. Note that the scanning line driving circuit 30 applies a voltage to the auxiliary capacitance line 18 as well, but a description of the connection system with the auxiliary capacitance line 18 is omitted in FIG. The scanning line driving circuit 30 gives a driving signal to the plurality of scanning lines 15.

  The scanning line control circuit 40 is electrically connected to the scanning line driving circuit 30. The scanning line control circuit 40 has a plurality of FDON elements 41. The scanning line control circuit 40 controls the scanning line driving circuit 30 so as to give a driving signal for turning on (moving) all the plurality of TFTs 12 to the plurality of scanning lines 15. When all of the plurality of TFTs 12 are turned on, each shift register 31 is given a signal from each FDON element 41, and each shift register 31 gives a drive signal to each scanning line 15 via the buffer 32.

  As shown in FIGS. 3 and 10, the switching circuit 50 includes a plurality of switching element groups 51, and each switching element group 51 includes a plurality of switching elements 52. In this embodiment, each switching element group 51 has three switching elements 52. The switching circuit 50 is a 1/3 multiplexer circuit. The switching element 52 is, for example, a TFT, and may be formed in the same manner as the TFT 12 described above.

  The switching circuit 50 is connected to the plurality of signal lines 20. The switching circuit 50 is connected to the signal line driving circuit 90 via the connection wiring 53. Here, the number of connection wirings 53 is 1/3 of the number of signal lines 20.

  The switching element (analog switch) 52 is turned on / off by the control signals ASW1, ASW2, and ASW3 so as to time-division drive three signal lines 20 per output (connection wiring 53) of the signal line driving circuit 90. Switched. These control signals ASW1-3 are given from the control unit 100.

  Then, in one horizontal scanning period, an ON control signal ASW1-3 is given to the switching element 52, and a desired video signal is written to the pixels 11 arranged in a horizontal row. When forming the switching circuit 50, the switching circuit 50 can be formed using the same material when forming the pixels 11 and the like.

  As shown in FIGS. 3 and 11, the signal line control circuit 60 has a plurality of switching elements 61. The switching element 61 is, for example, a TFT, and may be formed in the same manner as the TFT 12 described above.

  The signal line control circuit 60 is connected to the plurality of signal lines 20. The switching element 61 is switched on / off by a control signal given through the third wiring w3. ON / OFF of the plurality of switching elements 61 is switched at once. The signal line control circuit 60 simultaneously applies a common signal supplied via the second wiring w2 to the plurality of signal lines 20.

  As shown in FIG. 3, the OLB pad group 70 has a plurality of pads 71, 72, 73, 74, 75, 76. The pad 71 is connected to the scanning line driving circuit 30. The pad 71 is a start pulse pad, a clock pad, and a power supply pad. The pad 72 is connected to the scanning line control circuit 40.

  The pad 73 is connected to a later-described common electrode 83 via the first wiring w1. For this reason, the first wiring w <b> 1 can apply the common electrode voltage Vcom supplied through the pad 73 to the common electrode 83.

The pad 74 is electrically connected to the signal line control circuit 60 through the second wiring w2. The second wiring w2 is electrically connected to the plurality of signal lines 20 via the signal line control circuit 60. The pad 75 is electrically connected to the signal line control circuit 60 through the third wiring w3.
The pad 76 is a video pad or the like. The pad 76 is connected to the signal line driving circuit 90.
The array substrate 1 is formed as described above.

  As shown in FIGS. 3, 7, and 8, the counter substrate 2 includes, for example, a rectangular glass substrate 80 as a transparent insulating substrate. On the glass substrate 80, a lattice-shaped first light-shielding portion 81 and a rectangular frame-shaped second light-shielding portion 82 are provided. The first light shielding portion 81 is formed surrounding the pixel 11. The second light shielding portion 82 is formed surrounding the display region R1. The first light shielding part 81 and the second light shielding part 82 function as a black matrix.

  A color filter 4 is disposed on the glass substrate 80. The color filter 4 has a red colored layer 4R, a green colored layer 4G, and a blue colored layer 4B. The colored layers 4R, 4G, and 4B are each formed in a stripe shape, and extend along the direction in which the signal line 20 extends.

  A common electrode 83 made of a transparent conductive material such as ITO is formed on the color filter 4. Although not shown, the common electrode 83 is connected to the first wiring w1 through a conducting member. A plurality of protrusions 84 are formed on the common electrode 83. The protrusion 84 protrudes from the surface of the common electrode 83 toward the array substrate 1 side. The protrusion 84 is formed in a stripe shape, and a convex portion having a substantially triangular cross section extends along the direction in which the signal line 20 extends. The protrusion 84 extends in a direction along the long axis of the pixel 11.

  Each protrusion 84 overlaps the plurality of pixels 11 and is positioned so as to bisect the pixels 11 along the direction in which the scanning lines 15 extend. The plurality of protrusions 84 have a function of controlling the alignment direction of the liquid crystal molecules 3m of the liquid crystal layer 3 facing each other. The above function is exhibited when a voltage is applied between the pixel electrode 26 and the common electrode 83.

An alignment film 85 is formed on the common electrode 83 and the protrusions 84. In this embodiment, the alignment film 85 is a vertical alignment film. In a state where no voltage is applied between the pixel electrode 26 and the common electrode 83, the alignment film 85 aligns the liquid crystal molecules 3m together with the alignment film 28 in a direction perpendicular to the plane.
The counter substrate 2 is formed as described above.

  As shown in FIGS. 2 and 7, the gap between the array substrate 1 and the counter substrate 2 is held by columnar spacers 27. The array substrate 1 and the counter substrate 2 are bonded together by a sealing material 5 disposed along the outer periphery of the display region R1. A liquid crystal layer 3 is formed in a region surrounded by the array substrate 1, the counter substrate 2 and the sealing material 5. A liquid crystal injection port 6 is formed in a part of the sealing material 5, and the liquid crystal injection port 6 is sealed with a sealing material 7.

The first polarizing plate 8 is provided on the outer surface of the glass substrate 10. The second polarizing plate 9 is provided on the outer surface of the glass substrate 80.
The backlight unit B includes a light guide plate Ba, and a light source and a reflection plate (not shown) disposed to face one side edge of the light guide plate. The light guide plate Ba is disposed to face the first polarizing plate 8. The backlight unit B emits light toward the liquid crystal layer 3.

  In this embodiment, the liquid crystal display panel P transmits white light in a state where a voltage is applied to the liquid crystal layer 3 to display white, and the liquid crystal display panel P is in a state where no voltage is applied to the liquid crystal layer 3. A normally white type that displays gray or black by adjusting the amount of transmission is adopted.

  As shown in FIGS. 1, 3, and 10, the signal line driving circuit 90 is connected to the plurality of pads 76 and the plurality of signal lines 20. The signal line driving circuit 90 and the signal line 20 are connected via a connection wiring 53 and a switching circuit 50. The signal line driving circuit 90 gives video signals to the plurality of signal lines 20.

  As shown in FIGS. 1 and 3, the control unit 100 is electrically connected to the OLB pad group 70 via the FPC 110. The control unit 100 is electrically connected to the scanning line driving circuit 30, the scanning line control circuit 40, the signal line driving circuit 90, and the signal line control circuit 60 via the FPC 110 and the like.

The control unit 100 drives the scanning line driving circuit 30 and the signal line driving circuit 90 during image display. For this reason, an image can be displayed by a dynamic drive method.
The control unit 100 can drive the scanning line control circuit 40 and the signal line control circuit 60 to adopt a static drive method. By applying the common electrode voltage Vcom to the plurality of signal lines 20 through the pad 74, the second wiring w2, and the signal line control circuit 60, the potentials of all the plurality of pixel electrodes 26 are set to the same potential as the common electrode 83. Can do. Thereby, display unevenness at the start of image display and afterimage at the end of image display can be suppressed.

  As shown in FIG. 3, the first wiring w1 and the second wiring w2 are electrically connected by a conductive material 120 as a connecting means. More specifically, the pad 73 and the pad 74 are connected by the conductive material 120, whereby the first wiring w1 and the second wiring w2 are indirectly electrically connected. When the control unit 100 applies the common electrode voltage Vcom to the pad 73 via the FPC 110, the common electrode voltage Vcom can be applied to the common electrode 83 and the second wiring w2. The conductive material 120 can be formed at any timing before the FPC 110 and the OLB pad group 70 are connected.

Next, a manufacturing method of the liquid crystal display device configured as described above will be described in detail.
As shown in FIGS. 4 to 12, first, a glass substrate 10 is prepared. On the prepared glass substrate 10, a plurality of TFTs 12, a plurality of scanning lines 15, a plurality of auxiliary capacitance elements 17, a plurality of auxiliary capacitance lines 18, a plurality of capacitances are formed by a normal manufacturing process such as film formation and patterning. A signal line 20 and the like are formed. At this time, the scanning line drive circuit 30, the scanning line control circuit 40, the switching circuit 50, the signal line control circuit 60, the OLB pad group 70, the first to third wirings w1, w2, w3, etc. are simultaneously made of the same material as these. Form.
Thereafter, a plurality of pixel electrodes 26 and a plurality of columnar spacers 27 are formed on the glass substrate 10, and then a vertical alignment film material is applied to form an alignment film 28. Thereby, the array substrate 1 is completed.

  On the other hand, in the manufacturing method of the counter substrate 2, first, a glass substrate 80 is prepared. On the prepared glass substrate 80, after forming the first light shielding part 81, the second light shielding part 82, the color filter 4 and the common electrode 83, and the plurality of protrusions 84, a vertical alignment film material is applied to form the alignment film 85. Film. Thereby, the counter substrate 2 is completed.

  As shown in FIGS. 2 and 4 to 12, the array substrate 1 and the counter substrate 2 are then aligned using a jig, and, for example, a thermosetting sealing material 5 is provided on the peripheral edge of the glass substrate 80. To print. Next, the array substrate 1 and the counter substrate 2 are arranged to face each other with a predetermined gap by a plurality of columnar spacers 27, and the peripheral portions of the array substrate and the counter substrate are bonded to each other by the sealing material 5. Thereafter, the sealing material 5 is heated and cured to fix the array substrate 1 and the counter substrate 2.

  Subsequently, a liquid crystal composition containing a polymerizable compound is injected from a liquid crystal injection port 6 formed in a part of the sealing material 5 by a vacuum injection method. More specifically, a liquid crystal material having a negative dielectric anisotropy is added with a polymerizable monomer and a photoinitiator added.

  Thereafter, the liquid crystal injection port 6 is sealed with a sealing material 7 made of, for example, an ultraviolet curable resin. As a result, liquid crystal is sealed between the array substrate 1, the counter substrate 2, and the sealing material 5, and the liquid crystal layer 3 is formed. Then, a liquid crystal panel including the array substrate 1, the counter substrate 2, the liquid crystal layer 3, and the plurality of pixels 11 is formed.

  Next, a probe is brought into contact with the OLB pad group 70 to generate a potential difference between the plurality of pixel electrodes 26 and the common electrode 83 by a static drive method. For this reason, (1) the common electrode voltage Vcom is applied to the common electrode 83 via the pad 73 and the first wiring w1, and (2) the scanning line control circuit 40 is driven via the pad 72. A drive signal is applied to turn on all of the plurality of TFTs 12, and (3) a common signal is simultaneously applied to the plurality of signal lines 20 via the pad 74, the second wiring w 2, and the signal line control circuit 60. Needless to say, there is a potential difference between the signal (voltage) applied to the pads 73 and 74 via the probe.

  A voltage can be applied to the liquid crystal layer 3. As a result, the liquid crystal molecules 3m are aligned in a tilted manner from the normal direction of the planes of the array substrate 1 and the counter substrate 2. In a state where a voltage is applied to the liquid crystal layer 3, the liquid crystal layer 3 is irradiated with light from the outside of the array substrate 1.

  By the light irradiation, photopolymerization is started, the polymerizable compound is cured, and the cured polymerizable compound forms a PSA that imparts a pretilt angle. In addition, since all the polymerizable compounds are cured, the display image is not adversely affected.

Next, a static drive (simple drive) inspection is performed to determine whether the liquid crystal display device is excellent in display quality.
At this time, a voltage is applied to the liquid crystal layer 3 by a static driving method using a frame inversion driving method. Then, TV characteristics (transmittance characteristics with respect to voltage), response speed, optical characteristics, and the like are inspected. After the inspection, the application of voltage to the liquid crystal layer 3 is stopped. If it is determined that the liquid crystal display device is not excellent in display quality as a result of the inspection, the process proceeds to the repair process or is discarded. When it is determined that the liquid crystal display device is excellent in display quality, the process proceeds to the next manufacturing process.

  After the PSA is formed and inspected, the pad 73 and the pad 74 are connected by the conductive material 120. Thereby, the potential of the second wiring w2 can be set to the same potential as the first wiring w1. Subsequently, the first polarizing plate 8 is disposed on the outer surface of the array substrate 1, and the second polarizing plate 9 is disposed on the outer surface of the counter substrate 2. Next, the signal line driving circuit 90 is mounted on the array substrate 1.

As shown in FIGS. 1 and 2, thereafter, the OLB pad group 70 and the control unit 100 are connected by the FPC 110, and the backlight unit B and the like are attached.
Thereby, a liquid crystal display device is completed.

  According to the liquid crystal display device and the method for manufacturing the liquid crystal display device configured as described above, static driving (simple driving) can be performed in the manufacturing process. For this reason, PSA can be formed with high accuracy. Moreover, since a static drive test | inspection can also be performed, it can be judged whether a liquid crystal display device is excellent in display quality. Thereby, only the liquid crystal display device excellent in display quality can be transferred to the next manufacturing process.

  After the formation of the PSA and the static drive inspection, the potential of the second wiring w2 can be set to the same potential as that of the first wiring w1 by connecting the pad 73 and the pad 74 with the conductive material 120. The liquid crystal display device further includes a scanning line driving circuit 30, a scanning line control circuit 40, a signal line control circuit 60, and a signal line driving circuit 90.

For this reason, in normal use, dynamic driving during image display can be taken. Thereby, a large amount of information (for example, a moving image) can be displayed by dynamic driving. In addition, since an FDON circuit that is an off-afterimage countermeasure circuit such as a scanning line control circuit or a signal line control circuit is provided, when a low level signal is input to the FDON circuit, all the TFT gates are turned off and the signal lines are turned off. All can be set to the common electrode voltage Vcom, and an afterimage at the end of image display can be suppressed.
As described above, a liquid crystal display device excellent in display quality and a method for manufacturing the liquid crystal display device can be obtained.

  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 scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments. For example, some components may be deleted from all the components shown in the embodiment.

  For example, the conductive material 120 is formed so as to connect the pad 73 and the pad 74. However, the conductive material 120 is not limited thereto, and may be formed so as to set the first wiring w1 and the second wiring w2 to the same potential.

The signal line control circuit 60 may be electrically connected between the plurality of signal lines 20 and the signal line driving circuit 90 (switching circuit 50).
The display mode of the liquid crystal display panel P is not limited to the multi-domain VA (Vertically Aligned) mode, and can be variously modified.

  DESCRIPTION OF SYMBOLS 1 ... Array substrate, 2 ... Counter substrate, 3 ... Liquid crystal layer, 4 ... Color filter, 5 ... Sealing material, 10 ... Glass substrate, 11 ... Pixel, 12 ... TFT, 15 ... Scanning line, 17 ... Auxiliary capacitance element, 20 DESCRIPTION OF SYMBOLS ... Signal line 26 ... Pixel electrode 27 ... Columnar spacer 28 ... Alignment film 30 ... Scan line drive circuit 40 ... Scan line control circuit 50 ... Switching circuit 60 ... Signal line control circuit 70 ... OLB pad group , 71, 72, 73, 74, 75, 76 ... pad, 80 ... glass substrate, 83 ... common electrode, 85 ... alignment film, 90 ... signal line drive circuit, 100 ... control unit, 110 ... FPC, 120 ... conductive material , P ... liquid crystal display panel, B ... backlight unit, w1 ... first wiring, w2 ... second wiring, w3 ... third wiring, R1 ... display area, Vcom ... common electrode voltage.

Claims (4)

A plurality of signal lines, a plurality of scanning lines crossing the plurality of signal lines, a plurality of switching elements electrically connected to the plurality of signal lines and the plurality of scanning lines, and electrically connected to the plurality of switching elements An array substrate having a plurality of pixel electrodes formed,
A counter substrate having a common electrode facing the plurality of pixel electrodes;
A liquid crystal layer sandwiched between the array substrate and the counter substrate;
A scanning line driving circuit electrically connected to the plurality of scanning lines and supplying a driving signal to the plurality of scanning lines;
A scanning line control circuit that is electrically connected to the scanning line driving circuit and controls the scanning line driving circuit to give the driving signals to the plurality of scanning lines to turn on the plurality of switching elements;
A video signal output unit connected to the plurality of signal lines and providing a video signal to the plurality of signal lines;
And a signal line control circuit which is connected to the plurality of signal lines and simultaneously applies a common signal to the plurality of signal lines.   The scanning line driving circuit, the scanning line control circuit, the video signal output unit, and the signal line control circuit are electrically connected to drive the scanning line driving circuit and the video signal output unit during image display before image display and image 2. The apparatus according to claim 1, further comprising a control unit that drives the scanning line control circuit and the signal line control circuit at least after display and sets the potentials of all of the plurality of pixel electrodes to the same potential as the common electrode. The liquid crystal display device described. A first wiring electrically connected to the common electrode and applying a common electrode voltage to the common electrode;
A second wiring electrically connected to the signal line control circuit and electrically connected to the plurality of signal lines via the signal line control circuit;
The liquid crystal display device according to claim 1, further comprising connection means for electrically connecting the first wiring and the second wiring. A plurality of signal lines, a plurality of scanning lines crossing the plurality of signal lines, a plurality of switching elements electrically connected to the plurality of signal lines and the plurality of scanning lines, and electrically connected to the plurality of switching elements An array substrate having a plurality of pixel electrodes, a counter substrate having a common electrode facing the plurality of pixel electrodes, a liquid crystal layer sandwiched between the array substrate and the counter substrate, and the plurality of scanning lines A scanning line driving circuit that is electrically connected to the plurality of scanning lines and applies a driving signal to the plurality of scanning lines; and the driving signal that is electrically connected to the scanning line driving circuit and that turns on the plurality of switching elements. A scanning line control circuit that controls the scanning line driving circuit to be applied to the scanning lines, a signal line control circuit that is connected to the plurality of signal lines and simultaneously applies a common signal to the plurality of signal lines, and A first wiring that is electrically connected to the through electrode and applies a common voltage to the common electrode; and is electrically connected to the signal line control circuit and is connected to the plurality of signal lines via the signal line control circuit. A liquid crystal display device including a second wiring electrically connected;
A common electrode voltage is applied to the common electrode through the first wiring, the drive signal is applied to the plurality of scanning lines to turn on the plurality of switching elements, and the second wiring and the signal line control circuit are used. A common signal is simultaneously applied to the plurality of signal lines to cause a potential difference between the plurality of pixel electrodes and the common electrode,
After the potential difference is generated, the first wiring and the second wiring are connected by connection means, the potential of the second wiring is set to the same potential as the first wiring,
A method of manufacturing a liquid crystal display device, comprising: preparing a liquid crystal display device; and connecting a video signal output unit that applies a video signal to the plurality of signal lines to the plurality of signal lines.

Images