Liquid crystal display device

Abstract

A liquid crystal display device includes: a first substrate including a plurality of common wirings, each of the common wirings provided for each pixel, and a plurality of first bridge structures, each of the first bridge structures connecting two of the common wirings provided in two adjacent pixels; a second substrate that faces the first substrate; a liquid crystal layer interposed between the first substrate and the second substrate; and a plurality of spacer columns interposed between the first substrate and the second substrate and including a plurality of main spacer columns configured to maintain a cell gap of the plurality of pixels, each of the spacer columns being disposed to face each of the first bridge structures, and a plurality of sub-spacer columns disposed to face each of the second bridge structures, the sub-spacer columns being disposed to face each of the first bridge structures. And each main spacing column is propped against the first bridging structure. Under the condition that the aperture opening ratio is not reduced, the pixel switch element is prevented from being damaged, and the surface pressure intensity of the liquid crystal display device is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to a liquid crystal display device. BACKGROUND

[0002] In the existing liquid crystal display device, the color filter substrate and the array substrate are separated by a plurality of spacers, which can improve the strength of the external force applied to the panel in the thickness direction (also referred to as the face pressure strength).

[0003] In patent document 1, after the color filter substrate and the array substrate are attached, the spacers provided on the color filter substrate side are pressed on the pixel switching elements on the array substrate side. Since the pixel switching elements are usually formed to be small in size, the pressing area of the pixel switching elements and the spacers is also small, which causes the face pressure strength of the liquid crystal display device to be insufficient, and the display quality is easily reduced due to the force or impact from the outside. In addition, there is a problem that the spacers are easy to cause damage to the pixel switching elements. In addition, if the spacers are increased to increase the face pressure strength, the size of the pixel switching elements needs to be increased accordingly, which leads to a decrease in aperture ratio, which is not desirable.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT DOCUMENTS

[0006] Patent document 1: International published patent No. WO 2018 / 150959 A1 SUMMARY

[0007] In view of the above problems, the present application proposes a liquid crystal display device that can increase the face pressure strength without reducing the aperture ratio.

[0008] According to one aspect of the present application, a liquid crystal display device includes: a first substrate including a plurality of common wirings and a plurality of first bridge structures, each of the common wirings being provided for each pixel, each of the first bridge structures connecting two common wirings provided in two adjacent pixels; a second substrate facing the first substrate; a liquid crystal layer interposed between the first substrate and the second substrate; and a plurality of spacers interposed between the first substrate and the second substrate, and including a plurality of main spacers and a plurality of sub-spacers, the plurality of main spacers being configured to maintain a unit gap of the plurality of pixels, each of the spacers being provided opposite to each of the first bridge structures, and each of the main spacers abutting against the first bridge structure.

[0009] The present application is based on the above problems. According to one aspect of the present application, it is possible to avoid damage to the pixel switching elements without reducing the aperture ratio, and to increase the face pressure strength of the liquid crystal display device. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a plan view schematically showing a liquid crystal display device according to a first embodiment of the present application.

[0011] Figure 2 is an enlarged view of A portion of Figure 1

[0012] Figure 3 is a cross-sectional view taken along line III-III of Figure 2

[0013] Figure 4 is a plan view schematically showing a liquid crystal display device according to a second embodiment of the present application.

[0014] Figure 5 is an enlarged view of B portion of Figure 4

[0015] Figure 6 is a cross-sectional view taken along line VI-VI of Figure 5

[0016] is a plan view schematically showing a liquid crystal display device according to a third embodiment of the present application. Figure 7 DETAILED DESCRIPTION

[0017] In order to describe the technical solutions of the embodiments of the present application clearly and completely, the following will be described in conjunction with the drawings of the embodiments of the present application. It should be explained that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0018] In addition, it should be explained that when one component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a middle component. Also, in the following drawings, the illustration of some components is omitted for the clarity and simplicity of the drawings, and the length, width, and thickness do not represent the actual dimensional relationship.

[0019] [First Embodiment]

[0020] Hereinafter, the liquid crystal display device 1A according to the first embodiment of the present application will be described with reference to Figures 1 to 3 Figure 1 is a plan view schematically showing the liquid crystal display device 1A, Figure 2 is an enlarged view of A portion of Figure 1 Figure 3 is a cross-sectional view taken along line III-III of Figure 2 ​​​​​​​

[0021] As Figure 3 shown, the liquid crystal display device 1A includes an array substrate (sometimes also referred to as a "TFT substrate") 10, a color filter substrate (sometimes also referred to as a "counter substrate") 20 opposed to the array substrate 10, a liquid crystal layer 30 provided between the array substrate 10 and the color filter substrate 20, and a plurality of columnar spacers. The plurality of spacers include Figure 3 a plurality of main spacers 40 as shown in FIG. 1 and a plurality of sub-spacers not shown. The plurality of main spacers 40 serve to define the thickness of the liquid crystal layer 30 (i.e., the cell gap of each pixel).

[0022] As Figure 1 and Figure 3 shown, the constituent elements of the array substrate 10 are supported by a first substrate (e.g., a glass substrate, a plastic substrate) 11 having light-transmitting properties. The constituent elements of the array substrate 10 include a plurality of gate signal lines (also referred to as scan lines) GL extending in the row direction, a plurality of source signal lines SL extending in the column direction, a plurality of pixel switching elements 12 provided at the intersections of each gate signal line GL and each source signal line SL, a common wiring 13, a pixel electrode 14, and a bridge structure BR1.

[0023] As Figure 1 shown, a plurality of pixels P are divided by the plurality of gate signal lines GL and the plurality of source signal lines SL intersecting each other, and each pixel P is provided with the pixel switching element 12, the common wiring 13, and the pixel electrode 14. The gate signal line GL is composed of a first conductive film, and serves to transmit a scan signal, to scan the plurality of pixels P row by row, and to control the opening and closing of each pixel switching element 12. The source signal line SL transmits a data signal including gradation information, and the pixel switching element 12 receives the data signal and outputs a gradation value voltage to the pixel electrode 14 under the control of the gate signal line GL.

[0024] The pixel switching element 12 is typically a thin film transistor (TFT). As Figure 1 shown, the pixel switching element 12 includes a semiconductor layer 12a, a gate 12g composed of a position in the gate signal line GL overlapping the semiconductor layer 12a, a source 12s electrically connected to the source signal line SL, and a drain 12d. In addition, the pixel switching element 12 can be a transistor of a bottom gate type in which the gate 12g is located below the semiconductor layer 12a, but can also be a transistor of a top gate type. In addition, the pixel switching element 12 further includes a gate insulating layer 12i (see Figure 3 ). The gate insulating layer 12i electrically isolates the gate signal line GL (gate 12g) from the source signal line SL (source 12s, drain 12d).

[0025] The common wiring 13 serves to receive a common voltage, and is in the same potential as a whole. As Figure 1As shown, the common wiring 13 extends along both the column direction and the row direction, including at least one first common wiring 131 extending along the column direction (two in the example shown) and at least one second common wiring 132 extending along the row direction (one in the example shown). The second common wiring 132 is connected to the first common wiring 131 and is at the same potential. In addition, the common wiring 13 includes a common wiring extension 13a extending from each of the first common wiring 131 and the second common wiring 132. In the common wiring 13, the first common wiring 131 and the second common wiring 132 are formed on the same layer, but are not limited thereto, and can be formed on different layers, for example, on different layers and connected via a contact hole such as the contact hole Hb. In addition, it is understood that the first common wiring 131 and the second common wiring 132 can not be connected as long as they are set to the same potential. In addition, in the example shown, the two first common wirings 131 are disposed apart from each other on both sides of the pixel electrode 14 in the row direction, and extend along the column direction and across the length of the pixel electrode 14, and the second common wiring 132 crosses the width of the pixel electrode 14 at a substantially central position in the column direction of the pixel P and is connected to the two first common wirings 131 that are apart from each other. In addition, the common wiring 13 of the present application is not limited to the above example, and can extend along a direction intersecting the row direction and the column direction, and can include a curved portion. Instead of the common wiring 13, an electrode layer disposed in a planar shape in the pixel P can also be used. The conductive layer constituting the common wiring 13 can be made of a transparent conductive material, for example, a metal oxide such as indium tin oxide, indium zinc oxide, ZnO, etc. Figure 1 Figure 1 Figure 1

[0026] Figure 3 Figure 1

[0027] ​​​​​​The bridge structure BR1 is provided between two pixels P adjacent in the column direction, straddling the gate signal line GL, and connects the first common wirings 131 of the two adjacent pixels P. The bridge structure BR1 includes one or more insulating layers, a bridge electrode 19, and a common wiring extension 13a on the first substrate, the bridge electrode 19 connecting the common wiring extension 13a and the first common wiring 131 via a contact hole Hb through the one or more insulating layers, the first common wiring 131 being connected to the common wiring extension 13a and being formed of the same conductive layer. In the example shown, Figure 3 In the example shown, the one or more insulating layers include the gate insulating layer 12i, the first interlayer insulating film 15, and the second insulating film 16.

[0028] The specific configuration of the bridge structure BR1 will be described in detail below with reference to Figures 1 to 3

[0029] In the bridge structure BR1, the bridge electrode 19 extends in the column direction and straddles the gate signal line GL to connect the two first common wirings 131 corresponding to the adjacent pixels P. Here, the first common wiring 131 is formed on the same layer as the gate signal line GL. The bridge electrode 19 can be formed on the same layer as the pixel electrode 14 of the same or different transparent conductive material, but is not limited thereto and can be provided on a different layer. In the two pixels P adjacent in the column direction, for the upper pixel P, the first common wiring 131 of the upper pixel P is provided with a common wiring extension 13a extending toward the lower pixel P, the common wiring extension 13a overlapping the upper end of the bridge electrode 19 and being spaced apart from the gate signal line GL in a cross-sectional view, and a contact hole Hb is formed through the gate insulating layer 12i, the first interlayer insulating film 15, and the second insulating film 16 at the overlapping portion of the upper common wiring extension 13a and the upper end of the bridge electrode 19, and the bridge electrode 19 contacts the upper common wiring extension 13a via the contact hole Hb to connect the upper first common wiring 131. Similarly, for the lower pixel P, the first common wiring 131 of the lower pixel P is provided with a common wiring extension 13a extending toward the upper pixel P, the common wiring extension 13a overlapping the lower end of the bridge electrode 19 and being spaced apart from the gate signal line GL in a cross-sectional view, and a contact hole Hb is formed through the gate insulating layer 12i, the first interlayer insulating film 15, and the second insulating film 16 at the overlapping portion of the lower common wiring extension 13a and the lower end of the bridge electrode 19, and the bridge electrode 19 contacts the lower common wiring extension 13a via the contact hole Hb to connect the lower first common wiring 131. Thus, the upper first common wiring 131 and the lower first common wiring 131 are electrically connected via the bridge structure BR1.

[0030] ​As described above, the interlayer insulating film 15 is partially formed with the contact hole Hb. Further, the interlayer insulating film 15 can be further laminated on the pixel switching element 12, and a part or all of the interlayer insulating film 15 can be formed with the contact hole Ht. Thus, the interlayer insulating film 15 is interposed between the drain 12d of the pixel switching element 12 and the pixel electrode 14. Further, the drain 12d of the pixel switching element 12 is usually formed in the same layer as the source signal line SL (the source 12s of the pixel switching element 12) by the same second conductive film, and in this case, the interlayer insulating film 15 is also interposed between the source signal line SL and the pixel electrode 14. Further, the interlayer insulating film 15 can function as a planarization film. The interlayer insulating film 15 can use an organic insulating material such as a photosensitive resin.

[0031] The upper layer insulating film 16 is laminated on the interlayer insulating film 15, and as described above, a part of the upper layer insulating film 16 is formed with the contact hole Hb. Further, the upper layer insulating film 16 can be further laminated on the pixel switching element 12, and a part or all of the upper layer insulating film 16 can be formed with the contact hole Ht. Further, the upper layer insulating film 16 can function as a protective film for protecting the constituent elements such as the pixel switching element 12. The upper layer insulating film 16 can use an inorganic insulating material. However, the upper layer insulating film 16 can be formed so as to cover the pixel electrode 14, and thus the pixel electrode 14 and the bridge electrode 19 are formed in different layers and are disposed with the upper layer insulating film 16 interposed therebetween. It is to be understood that the upper layer insulating film 16 can be omitted in some embodiments.

[0032] Further, it is to be understood that in some embodiments, the one or more insulating layers include at least any one of the gate insulating layer 12i, the first interlayer insulating film 15, and the second insulating film 16. That is, in the bridge structure BR1, one or both of the gate insulating layer 12i, the first interlayer insulating film 15, and the second insulating film 16 can be omitted.

[0033] Further, the present embodiment is not limited to the above-described configuration. For example, the first common wiring 131 can be formed between adjacent two of the one or more insulating layers (for example, the interlayer insulating film 15 and the upper layer insulating film 16, the interlayer insulating film 15 and the gate insulating layer 12i). That is, in the bridge structure BR1, the common wiring extension 13a and the bridge electrode 19 are each electrically isolated from the gate signal line GL, and the first common wiring 131, the common wiring extension 13a, the gate signal line GL, the bridge electrode 19, and the lamination relationship of each of the one or more insulating layers can be appropriately set according to the actual needs.

[0034] Furthermore, this embodiment is not limited to the configuration described above. For example, one or more insulating layers of the bridge structure BR1 may also be additional insulating layers that do not overlap with the pixel switch element 12. Therefore, the gate signal line GL may also be provided between two adjacent insulating layers of the bridge structure BR1.

[0035] In addition, the material of the insulating layer is not limited to the above materials and can be selected according to actual needs.

[0036] like Figure 3 As shown, the components of the color filter substrate 20 are supported by a second substrate (such as a glass substrate, a plastic substrate) 21 with light transmittance. The components of the color filter substrate 20 include a black matrix 22, a color filter 23, a common electrode layer 24, and a conductive layer 25. The black matrix 22 is stacked on the second substrate 21, and is usually arranged between color filter layers of different colors to avoid light mixing between different colors. The color filter 23 is stacked on the second substrate 21 and the black matrix 22, and the transmission includes one or more colors. Common colors are red, green, and blue (RGB), thereby achieving color display. In the present application, a plurality of spacers are composed of a black matrix 22 and a color filter 23 of one or more colors stacked on the black matrix 22. As mentioned above, the plurality of spacers include Figure 3 The main spacers 40 shown in the figure and the sub-spacers not shown in the figure are multiple main spacers 40. The main spacers 40 are support columns that determine the cell gap in the liquid crystal display panel. The sub-spacers do not play a decisive role in the gap of the liquid crystal display panel, but can increase the pressing strength when the liquid crystal display panel is subjected to external force. As is well known, the cell gap is closely related to the amount of liquid crystal. If the amount of liquid crystal is too much, uneven gravity is likely to occur. If the amount of liquid crystal is too little, vacuum bubbles are likely to occur. Here, increasing the step difference between the main spacers and the sub-spacers can effectively increase the liquid crystal dripping window, and is less likely to cause problems such as uneven gravity and vacuum bubbles.

[0037] The common electrode layer 24 is disposed opposite the pixel electrodes 14 of the array substrate 10 and is stacked on the color filter 23. The conductive layer 25 is disposed opposite the bridge electrode 19 and is stacked on the spacer, which is disposed opposite the bridge electrode 19 of the array substrate 10.

[0038] After the array substrate 10 and the color filter substrate 20 are bonded together, the main spacers 40 are in contact with the bridging electrodes 19, while the sub-spacers are opposite but not in contact with the bridging electrodes 19. The following description focuses on the main spacers 40, but it is understood that the sub-spacers can also adopt the same structure as long as they do not contact any part of the array substrate 10.

[0039] Specifically, the top of the main spacer 40 is aligned with the portion of the bridge electrode 19 of the bridge structure BR1 between the two through-holes Hb, and is arranged to abut against the bridge electrode 19 on the upper surface of the bridge structure BR1, so that the conductive layer 25 is in contact with and electrically connected to the bridge electrode 19. In some embodiments, the conductive layer 25 can be omitted, and the bridge electrode 19 in the example above can be directly in contact with the main spacer 40. Figure 3 Specifically, the top of the main spacer 40 is aligned with the portion of the bridge electrode 19 of the bridge structure BR1 between the two through-holes Hb, and is arranged to abut against the bridge electrode 19 on the upper surface of the bridge structure BR1, so that the conductive layer 25 is in contact with and electrically connected to the bridge electrode 19. In some embodiments, the conductive layer 25 can be omitted, and the bridge electrode 19 in the example above can be directly in contact with the main spacer 40. Figure 3 Specifically, the top of the main spacer 40 is aligned with the portion of the bridge electrode 19 of the bridge structure BR1 between the two through-holes Hb, and is arranged to abut against the bridge electrode 19 on the upper surface of the bridge structure BR1, so that the conductive layer 25 is in contact with and electrically connected to the bridge electrode 19. In some embodiments, the conductive layer 25 can be omitted, and the bridge electrode 19 in the example above can be directly in contact with the main spacer 40.

[0040] In addition, in the above-described example, the pixel electrode 14 is stacked above the common wiring 13, but the present application is not limited thereto, and the positions of the pixel electrode 14 and the common wiring 13 can be reversed, i.e., the common wiring 13 can also be stacked above the pixel electrode 14 via an insulating layer, in which case the main spacer 40 can be arranged to abut against the upper surface of the insulating layer between the two common wirings 13 in adjacent pixels. In addition, in the case where the bridge electrode 19 is to be connected to the conductive layer on the main spacer 40, a contact hole for connection or an opening exposing the bridge electrode 19 can be further provided in the insulating layer between the adjacent common wirings 13. It can be understood that in the bridge structure BR1, the second common wiring 132 and the bridge electrode 19 are both electrically isolated from the source signal line SL, and the stacking relationship of the second common wiring 132, the source signal line SL, the bridge electrode 19, and the respective insulating layers of one or more insulating layers can be appropriately set according to actual needs.

[0041] In addition, the main spacer 40 of the present embodiment is not limited to using the layer of the color filter as the spacer, and can also use a spacer formed by a jet molding process or the like.

[0042] According to the present embodiment, compared with the prior art that abuts against the pixel switching element, the pixel switching element 12 can be prevented from being damaged without reducing the aperture ratio, and the face pressure strength of the liquid crystal display device 1A is increased.

[0043] In addition, in display technology, the deflection of liquid crystals is controlled by the pressure difference between the common voltage and the gray value voltage to achieve display of different brightness, and when the pressure difference of the positive and negative periods is different, jitter and flicker phenomena occur, affecting the display quality. In the present embodiment, by providing the first common wiring 131 extending along the column direction and across the length of the pixel electrode 14, and the second common wiring 132 extending along the row direction and across the length of the pixel electrode 14, the common voltage can be stabilized, the jitter and flicker phenomena can be suppressed, and the display quality is improved.

[0044] Moreover, static electricity is accumulated on the glass during the product transportation and use, and this static electricity causes electrostatic discharge damage to the elements on the array substrate side when it enters the inside of the device. In the present application, the conductive layer 25 is brought into contact with and electrically connected to the bridge electrode 19 by the pressure bonding of the main spacers 40 and the bridge structure BR1, and thus the static electricity accumulated on the array substrate 10 side during the manufacturing process is guided to the color filter substrate 20 side through the bridge electrode 19 and the conductive layer 25, thereby effectively protecting the elements on the array substrate 10 side from electrostatic discharge damage.

[0045] [Second Embodiment]

[0046] Hereinafter, a liquid crystal display device 1A according to a second embodiment of the present application will be described with reference to the drawings. Figure 4 is a schematic plan view showing a liquid crystal display device 1B, Figure 5 is an enlarged view of a B portion of Figure 4 , and Figure 6 is a VI-VI line sectional view of Figure 5 .

[0047] The present application differs from the above-described embodiment in that the above-described bridge structure BR1 is replaced with a bridge structure BR2. In the present embodiment, the bridge structure BR2 is provided between two adjacent pixels P in the row direction, straddles the source signal line SL, and connects the respective second common wirings 132 of the two adjacent pixels P. The bridge structure BR2 includes one or more insulating layers, a bridge electrode 19, and a common wiring extension 13a on the first substrate, and the bridge electrode 19 is connected to the common wiring extension 13a and the second common wiring 132 via a contact hole Hb through the one or more insulating layers. In the example shown in Figure 6 , the one or more insulating layers can include the gate insulating layer 12i, the first interlayer insulating film 15, and the second insulating film 16.

[0048] Hereinafter, the detailed configuration of the bridge structure BR2 will be described with reference to Figures 4 to 6 , and the same description as in the above-described embodiment will be omitted.

[0049] In the bridge structure BR2, the bridge electrode 19 extends in the row direction and straddles the source signal line SL, and serves to connect the two second common wirings 132 corresponding to the adjacent pixels P. Here, the source signal line SL is formed on a layer higher than the second common wiring 132. Therefore, it can also be said that the source signal line SL is provided between the adjacent two insulating layers of the bridge structure BR2. Specifically, as shown in Figure 6As shown, in the two pixels P adjacent to each other in the row direction, for the left pixel P, the second common wiring 132 provided in the left pixel P extends a common wiring extension 13a toward the right pixel P, the common wiring extension 13a overlaps the left end portion of the bridge electrode 19 and is spaced apart from the source signal line SL, a contact hole Hb is formed through the gate insulating layer 12i, the first interlayer insulating film 15, and the second insulating film 16 at the overlapping portion of the left common wiring extension 13a and the left end portion of the bridge electrode 19, and the bridge electrode 19 contacts the left second common wiring 132 via the contact hole Hb. Similarly, for the right pixel P, the second common wiring 132 provided in the right pixel P extends a common wiring extension 13a toward the left pixel P, the common wiring extension 13a overlaps the right end portion of the bridge electrode 19 and is spaced apart from the source signal line SL, a contact hole Hb is formed through the gate insulating layer 12i, the first interlayer insulating film 15, and the second insulating film 16 at the overlapping portion of the right common wiring extension 13a and the right end portion of the bridge electrode 19, and the bridge electrode 19 contacts the right second common wiring 132 via the contact hole Hb. Further, at the position where the contact hole Hb is formed, the common wiring extension 13a extending from the first common wiring 131 overlaps the common wiring extension 13a extending from the second common wiring 132 in plan view, and the two can be connected to each other in the same layer or in different layers at the same potential.

[0050] According to the present embodiment, the same technical effects as the first embodiment can be obtained.

[0051] [Third Embodiment]

[0052] Hereinafter, a liquid crystal display device 1C according to a third embodiment of the present application will be described with reference to the drawings. Figure 7 is a plan view schematically showing the liquid crystal display device 1C.

[0053] In the present embodiment, both the bridge structure BR1 and the bridge structure BR2 are present in one pixel.

[0054] Further, in other embodiments, at least either one of the bridge structure BR1 and the bridge structure BR2 can be selectively formed in some pixels. Further, the arrangement density of the bridge structure BR1 and the bridge structure BR2 and the selection of which is provided for the main spacers or the sub spacers can be designed as needed.

[0055] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A liquid crystal display device, characterized in that: include: a first substrate comprising a plurality of common wirings and a plurality of first bridge structures, wherein each common wiring is provided for each pixel, and each first bridge structure connects two common wirings provided in two adjacent pixels; a second substrate, which is opposite to the first substrate; a liquid crystal layer sandwiched between the first substrate and the second substrate; as well as a plurality of spacers, which are sandwiched between the first substrate and the second substrate and include a plurality of main spacers and a plurality of sub-spacers, wherein the plurality of main spacers are configured to maintain a cell gap of the plurality of pixels; Each of the spacer columns is arranged opposite to each of the first bridging structures. Each of the main spacers abuts against the first bridging structure.

2. The liquid crystal display device according to claim 1, wherein The first substrate further includes a plurality of first signal lines and a plurality of second signal lines for dividing the plurality of pixels, wherein the first signal lines and the second signal lines are orthogonal to each other. The first bridging structure extends along a first direction parallel to one of the first signal line and the second signal line, spans and stacks on the other of the first signal line and the second signal line, and is electrically isolated from the other signal line. The first bridging structure is used to connect the two common wirings in the two pixels adjacent to each other in the first direction.

3. The liquid crystal display device according to claim 2, wherein The first bridge structure includes a bridge electrode, one or more insulating layers, and a common wiring extension portion, wherein the common wiring extension portion is connected to the common wiring and formed on the same layer. The one or more insulating layers are sandwiched between the bridge electrode and the common wiring, and a first contact hole is formed through the one or more insulating layers. The bridge electrode and the common wiring are connected via the first contact hole.

4. The liquid crystal display device according to claim 3, wherein In two adjacent pixels, the bridge electrode located between the first contact hole of one pixel and the first contact hole of the other pixel abuts against the main spacer.

5. The liquid crystal display device according to claim 3, wherein The second substrate includes a conductive layer covering the plurality of spacer pillars. The main spacer contacts the bridge electrode via the conductive layer.

6. The liquid crystal display device according to any one of claims 3 to 5, characterized in that The bridge electrode is made of a transparent conductive material.

7. The liquid crystal display device according to claim 2, wherein The common wiring includes one or more first common wirings extending along the first direction and extending across the length of each of the pixels, and one of the one or more first common wirings overlaps with the first bridge structure. One or more of the first common wirings and the other signal line are provided at a same layer or a different layer with a gap therebetween.

8. The liquid crystal display device according to claim 7, wherein The common wiring includes a second common wiring connected to the one or more first common wirings and formed across a width of each of the pixels.

9. The liquid crystal display device according to claim 2, wherein The first substrate further includes a plurality of second bridging structures, the second bridging structures extending along a first direction parallel to the other of the first signal line and the second signal line, spanning and stacked on the one of the first signal line and the second signal line, and the first bridging structures and the second bridging structures do not share the same spacer. The plurality of pixels include a first pixel and a second pixel different from the first pixel, the first pixel includes the first bridge structure, and the second pixel includes the second bridge structure.

10. The liquid crystal display device according to claim 2, wherein The first substrate further includes a plurality of second bridging structures, the second bridging structures extending along a first direction parallel to the other of the first signal line and the second signal line, spanning and stacked on the one of the first signal line and the second signal line, and the first bridging structures and the second bridging structures do not share the same spacer. The plurality of pixels include a first pixel, and the first pixel includes the first bridge structure and the second bridge structure.

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