JP2001290159A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of normally holding continuity between two substrates and improving display quality. SOLUTION: In the liquid crystal display device 1 comprising a liquid crystal 14 disposed between a TFT (thin film transistor) substrate 10 having TFT elements and a color filter(CF) substrate 11 having a CF, a plurality of protrusions 50, 51 are formed on the CF substrate 11 and a counter electrode 40 is formed thereon. Thereby, a spacer 43 to hold a distance between the TFT substrate 10 and CF substrate 11 and a conductive protrusion 42 to electrically connect the TFT substrate 10 and CF substrate 11 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device used for a notebook computer or a display.

[0002]

2. Description of the Related Art TFT (Thin Film Transistor)
A conventional technique will be described using a color liquid crystal display device having elements as an example. Most of the liquid crystal display devices have a TFT substrate and a CF (color filter) substrate facing each other, each substrate is bonded with a sealant, and liquid crystal is sealed between the substrates. The spacing (cell gap) between the substrates in which the liquid crystal is sealed is maintained by a number of granular spacers distributed between the substrates. The TFT substrate has a TFT element, a pixel electrode, and an alignment film on a transparent substrate.
The substrate has a color filter, a counter electrode, and an alignment film on a transparent substrate.

In order to drive the liquid crystal display device, a circuit substrate is electrically connected to a TFT substrate. A counter electrode (common electrode) formed on a CF substrate is also electrically connected to a part of the wiring of the circuit substrate. Need to be connected to For this reason, in the prior art, a conductive paste is applied on a CF substrate in a manufacturing process of a liquid crystal display device, and this conductive paste is brought into contact with a part of the wiring of the TFT substrate, thereby forming a circuit between the counter electrode of the CF substrate and the circuit. The board is electrically connected. The alignment films on both substrates are formed by performing a rubbing process using a cloth or the like.

FIG. 12 is a flowchart showing an example of a procedure for manufacturing a conventional liquid crystal display device. According to the conventional manufacturing method, the cleaning after the rubbing treatment of the alignment film (a4) is completed.
The conductive paste is applied to the FT substrate (a5), and spacers are dispersed (a6). On the other hand, a sealing material is applied to the CF substrate after the cleaning (b4) after the rubbing treatment (b)
5) Apply a temporary fixing resin (b6). Thereafter, a bonding step (c1) of the two substrates is performed.

[0005]

In the conventional manufacturing procedure shown in FIG. 12, a conductive paste is applied (a5) and spacers are dispersed (a) on a TFT substrate which has been cleaned after rubbing.
The processing of 6) must be performed. Performing such treatment after the rubbing cleaning (a4) and before the laminating step (c1) is not desirable because there is a concern that foreign substances may adhere to the substrate.

Further, in the conventional liquid crystal display device, a conductive paste is used to conduct the counter electrode of the CF substrate and a part of the wiring of the TFT substrate. However, it is difficult to make the applied amount of the conductive paste uniform. If the amount of the conductive paste applied is too small, the electrical connection between the CF substrate and the TFT substrate becomes incomplete, which may cause defective products. In addition, the variation in the amount of the conductive paste applied, even if it does not result in a production defect, causes variation in the electrical resistance value at the connection portion or unevenness in the distance between the substrates, and causes deterioration in the display quality of the liquid crystal display device. It is better not to occur as much as possible.

In the liquid crystal display device, the cell gap is maintained by the granular spacers. However, it is difficult to uniformly disperse the granular spacers such as transparent beads. Unevenness may occur, which may cause a decrease in display contrast of the liquid crystal display device and unevenness in color. Further, it is difficult to dispose the spacer at a specific position. When the spacer is disposed in a pixel area directly related to the display of the liquid crystal display device, light leaks from the spacer, and the display contrast is reduced. . Note that the pixel area is an area where the pixel electrode of the TFT substrate and the counter electrode of the CF substrate face each other.

[0008] The object of the present invention is to solve these problems,
An object of the present invention is to provide a liquid crystal display device capable of normally conducting two substrates and improving display quality.

[0009]

According to the present invention, in a liquid crystal display device in which liquid crystal is interposed between two substrates, a plurality of projections are formed on one of the substrates, and a counter electrode is formed thereon. Thus, a liquid crystal display device is provided in which a spacer for maintaining a distance between two substrates and a conductive protrusion for electrically connecting the two substrates are formed.

According to the prior art manufacturing method, a conductive paste for conducting the two substrates is applied to one of the substrates which has been cleaned after the rubbing treatment, and a spacer for keeping the distance between the two substrates is dispersed. Is performed. On the other hand, in the present invention, a protrusion is provided on one of the substrates before the formation of the alignment film and the counter electrode, and the counter electrode is formed thereon. Since the conductive projections for electrically connecting the substrates are formed, it is possible to avoid the risk of foreign matter adhering to the substrates before bonding.

Further, in the present invention, the electrical connection between the two substrates made by the conductive paste is made by the conductive projections covered with the counter electrode in the present invention. Can be prevented. Further, since the conductive projection of the present invention can be formed in a predetermined shape, unlike the conventional conductive paste, it is possible to prevent a decrease in display quality due to a difference in electric resistance value or unevenness in substrate spacing. Further, since the spacer of the present invention can be easily formed at a predetermined position, it is possible to prevent unevenness in the interval between the substrates, and to prevent deterioration in display quality.

Further, the conductive projection according to the present invention is characterized in that an opposing electrode is formed on a projection having a gentle side surface, so that the projection is electrically connected from the top to the bottom of the projection. .

According to the present invention, since the conductive projection has a gentle slope on the side face of the projection, the side face of the projection can be completely covered with the counter electrode, and the top and bottom portions are reliably electrically connected. For this reason, in the liquid crystal display device having the conduction projection, conduction failure between the two substrates can be prevented.

Further, the spacer according to the present invention is characterized in that an opposing electrode is formed on a projection having a steep side surface, so that an electrical connection between a top and a bottom of the projection is cut off. I do.

According to the present invention, since the spacer has a steep side surface of the protrusion, even if the counter electrode is formed uniformly on the substrate, the counter electrode is not formed on the side surface of the protrusion and the top of the protrusion is formed. The electrical connection between the and the bottom is cut off. For this reason, even if the spacer contacts the pixel electrode on the other substrate, the pixel electrode and the counter electrode do not conduct.

Further, the present invention is characterized in that a conductive projection covered with the counter electrode and a spacer not covered with the counter electrode are formed by patterning and forming the counter electrode.

According to the present invention, since the opposing electrode is patterned and formed, a conductive projection covered with the opposing electrode and a spacer not covered with the opposing electrode are formed. The substrates can be electrically connected, and the distance between the two substrates can be kept constant by the spacer. Further, since the spacer is not covered with the counter electrode, the spacer does not conduct even when it comes into contact with the pixel electrode on the other substrate.

Further, according to the present invention, the conductive projection is formed at a position on the other substrate which does not contact the pixel electrode.

According to the present invention, since the conductive protrusion is formed at a position on the other substrate which does not contact the pixel electrode, it is possible to prevent the opposing electrode covering the conductive protrusion from conducting to the pixel electrode.

According to the present invention, in a liquid crystal display device in which liquid crystal is interposed between two substrates, a plurality of projections are formed on one of the substrates, and a counter electrode is formed on the projections. A conductive projection is formed to maintain the distance between the substrates and electrically connect the two substrates, and the pixel electrode of the other substrate is patterned so that the conductive projection does not contact the pixel electrode of the other substrate. A liquid crystal display device characterized by the above-mentioned.

According to the present invention, the pixel electrode on the other substrate is patterned so as not to come into contact with the conductive projection, so that conduction between the counter electrode covering the conductive projection and the pixel electrode can be prevented. . For this reason, the range in which the conductive projection can be formed can be widened, and the conductive projection can reduce
The distance between the substrates can be kept uniform.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a TFT (Thin Film Transi
An embodiment of the present invention will be described by taking a color liquid crystal display device having a (stor) element as an example. Many of the liquid crystal display devices have a color filter (CF) substrate and a TFT substrate facing each other, each substrate is bonded with a sealant, and liquid crystal is sealed between the substrates. TFT
The substrate is formed by laminating a TFT element, a pixel electrode made of ITO (indium tin oxide), an alignment film, and the like in this order on a transparent substrate made of glass or the like. On the other hand, the CF substrate is configured such that a color filter, a protective film, a counter electrode made of ITO and the like, and an alignment film are laminated in this order on a transparent substrate made of glass or the like. The TFT substrate is electrically connected to a circuit substrate for driving a liquid crystal display device by a conductive film or the like, and the counter electrode of the CF substrate is electrically connected to a part of the wiring of the TFT substrate. It is electrically connected to the circuit board.

FIG. 1 shows the conductive projections 12 and the spacers 13.
FIG. 2 is a schematic view showing a liquid crystal display device according to the present invention having the following. A plurality of protrusions having the same height are formed at predetermined positions on the CF substrate 11, and a counter electrode is formed thereon, so that the conductive protrusion 12 whose protrusion is covered with the counter electrode and the protrusion are formed by the counter electrode. An uncoated spacer 13 is formed. Here, the conductive protrusion 12 covered by the counter electrode is T
It is formed at a predetermined position in contact with a part of the wiring of the FT substrate 10.

When the TFT substrate 10 is bonded to the CF substrate 11 on which the conductive protrusions 12 and the spacers 13 are formed,
The spacing (cell gap) between the substrates 10 and 11 is kept constant by the conductive protrusions 12 and the spacers 13 having a predetermined height.

Further, the conductive projection 12 covered with the counter electrode is provided.
Is formed at a predetermined position in contact with a part of the wiring of the TFT substrate 10 and has a predetermined height for maintaining a cell gap, so that the TFT substrate 10 and the CF substrate 11 can be reliably electrically connected. . Therefore, the TFT substrate 10
A circuit board (not shown) that is electrically connected to the counter electrode of the CF substrate 11 can be electrically connected to the circuit board.
Here, since the spacer 13 is not covered with the counter electrode, it does not conduct even when it comes into contact with the pixel electrode of the TFT substrate 10. Further, since the alignment films of the TFT substrate 10 and the CF substrate 11 are formed except for the positions where the conductive protrusions 12 are arranged, they do not affect the electrical connection between the TFT substrate 10 and the CF substrate 11.

Next, a procedure for manufacturing the plurality of protrusions of the CF substrate 11 will be described. FIG. 2 is a cross-sectional view illustrating a procedure for manufacturing the plurality of protrusions 15 of the CF substrate 11. First, in FIG. 2A, a substrate 17 on which a color filter layer 24 is formed on a transparent substrate 19 and a protective film 20 is formed thereon is prepared. The color filter layer 24 has red (R), green (G), and blue (B) filters and a black mask (BK) disposed therebetween. Next, on the protective film 20 of the substrate 17, for example, an acrylic negative resist resin which is cured by ultraviolet rays is applied by a spin coating method or the like to form a resin film 21 having a predetermined thickness.

Next, as shown in FIG. 2B, a mask plate 22 having a mask portion 23 patterned on a transparent sheet 25 is arranged above the resin film 21 so as to be aligned. The mask portion 23 is patterned so that a plurality of portions of the resin film 21 serving as the protrusions 15 are irradiated with ultraviolet rays. Next, ultraviolet rays are irradiated from above the mask plate 22 to expose the resin film 21.

Thereafter, unnecessary portions of the resin film 21 are removed with an alkali developing solution, and a plurality of projections 15 are formed as shown in FIG. Here, as the material of the projection 15, T
The use of a photosensitive material that is widely used in the manufacturing process of the FT substrate 10 and the CF substrate 11 has an advantage that it is not necessary to add new equipment to form the projection 15.

FIG. 3 is a sectional view showing a liquid crystal display device 1 according to an embodiment of the present invention, and FIG. 4 is a plan view showing a TFT substrate 10 of the liquid crystal display device 1. The liquid crystal display device 1 includes a CF substrate 11 and a TFT substrate 1 facing each other.
The substrates 10 and 11 are bonded together by a sealing material 41, and a liquid crystal 14 is sealed between the substrates 10 and 11.

The TFT substrate 10 includes a TFT element 34 and a source bus line 3 on a transparent substrate 18 made of glass or the like.
0, a gate bus line 31, a common bus line 32, a storage capacitor 35, a pixel electrode 36 made of ITO (indium tin oxide), and the like, and an alignment film (not shown) is laminated thereon. The TFT substrate 10 has a Cs on Common structure in which the auxiliary capacitance 35 is provided on the common bus line 32 and the same signal as the common bus line 32 is input to the auxiliary capacitance 35 and driven. The auxiliary capacity 35 is
It is effective for reducing the influence of the liquid crystal specific resistance and stabilizing the driving of the liquid crystal 14, and also has a role of suppressing the so-called flicker phenomenon which is perceived when the light of the liquid crystal display device 1 blinks. Note that the source bus lines 30 and the gate bus lines 31 are arranged in a lattice, and the pixel electrodes 36 and the TFT elements 34 are arranged in the cells.

On the other hand, the CF substrate 11 is provided on a substrate 17 on which a color filter layer and a protective film are formed on a transparent substrate.
Two types of resin protrusions 50 and 51 having different shapes are formed, and a counter electrode 40 made of ITO and an alignment film (not shown) are laminated thereon. Resin protrusion 5
Numerals 0 and 51 are projections having the same height.
Has a columnar shape, the side surface of which is substantially perpendicular to the substrate 17, and the other protrusion 50 has a chevron shape, the inclination of the side surface being gentler than the inclination of the side surface of the protrusion 51.

By forming the opposing electrode 40 on the resin protrusion 50 having a gentle slope on the side surface, a conductive protrusion 42 covered with the opposing electrode 40 is formed. In the conductive protrusion 42, the side surface and the upper surface of the protrusion 50 are completely covered by the opposing electrode 40 since the side surface of the resin protrusion 50 is gentle, and the protrusion 50 is electrically connected from the top to the bottom.

On the other hand, by forming the opposing electrode 40 on the resin protrusion 51 whose side surface is perpendicular to the substrate 17, a spacer 43 is formed in which the top and bottom are not conductive. In the spacer 43, the inclination of the side surface of the resin-made protrusion 51 is steep.
The electrode film 44 is formed only on the upper surface of the
0, the electrical connection between the top and bottom of the protrusion 51 is cut off.

The conductive projection 42 is provided at a position in contact with the position 33 where the common bus lines 32 of the TFT substrate 10 are bundled when the substrates 10 and 11 are bonded to each other.
Is provided at a predetermined position in the display area. The CF substrate 11 on which the conductive protrusions 42 and the spacers 43 are formed and T
When the FT substrate 10 is bonded to the FT substrate 10, the conductive protrusions 42 and the spacer 43 having a predetermined height allow the two substrates 10, 1
1 is kept constant.

The conductive projection 4 covered with the counter electrode 40
2 is formed at a position opposite to the position 33 where the common bus lines 32 of the TFT substrate 10 are bundled, and has a predetermined height for maintaining a cell gap, so that the counter electrode 40 and the common bus line 32 can be securely connected. Can be electrically connected. Thereby, the potential of the counter electrode 40 can be made equal to the potential of the common bus line 32. On the other hand, since the top and bottom of the spacer 43 are not electrically connected, the spacer 43 does not conduct even when it comes into contact with the pixel electrode 36 of the TFT substrate 10. In addition, since the alignment films (not shown) of the TFT substrate 10 and the CF substrate 11 are formed except for the positions where the conductive protrusions 42 are arranged, they do not affect the electrical connection between the TFT substrate 10 and the CF substrate 11.

Next, a procedure for manufacturing the conductive projection 42 and the spacer 43 will be described. FIG. 5 is a cross-sectional view illustrating a procedure for manufacturing the conductive protrusion 42 and the spacer 43. First,
As shown in FIG. 5A, two types of protrusions 50 and 51 having different shapes are simultaneously formed on the substrate 17. As shown in FIG. 2, when the projections 50 and 51 are formed of a photosensitive material, two types of projections 50 and 51 having different shapes are simultaneously formed on one substrate 17 by changing the exposure amount. be able to. That is, when the resin film is irradiated with a sufficient exposure amount, the protrusion 51 having a taper angle θ _{2 of} approximately 90 ° and a steeply inclined side surface is formed. theta ₁ is inclined gentle projections 50 of the smaller side than the taper angle theta ₂ is formed.

Next, as shown in FIG. 5B, when the electrode material is uniformly sputtered or vapor-deposited on the substrate 17 on which the resin protrusions 50 and 51 are formed, the protrusions 51 have a steep side surface. Therefore, the spacer film 44 is formed only on the upper surface and the side surface is not covered with the counter electrode. On the other hand, since the projection 50 has a gentle slope on the side, the projection 50 is completely covered with the counter electrode 40 to form the conductive projection 42. As described above, in the manufacturing procedure shown in FIG. 5, the conductive projections 42 and the spacers 44 can be formed simultaneously and without patterning the counter electrode 40.

FIG. 6 is a plan view showing the arrangement positions of the projections 50 and 51. FIG. As shown in FIG. 6, CF outside the display area
A projection 5 having a small taper angle θ ₁ is formed on a peripheral portion 11 a of the substrate 11.
0, and the central portion 11 of the CF substrate 11 in the display area
b to form a larger projection 51 of the taper angle theta _2.

If the protrusions 50 and 51 are formed of a photosensitive resin as described above, the protrusions 5 are formed on the peripheral portion 11a.
Forming 0 and forming the projection 51 on the central portion 11b can be easily achieved. Thus, the projections 50 and 5
By forming 1, the conductive protrusions 42 and the spacers 43 can be formed at predetermined positions to be arranged respectively. In FIG. 6, the reason why the TFT substrate 10 is larger than the CF substrate 11 is that the terminal portion 10a is formed around the TFT substrate 10.

FIG. 7 is a sectional view showing a liquid crystal display device 2 according to another embodiment of the present invention. In the liquid crystal display device 2, the same components as those of the liquid crystal display device 1 are denoted by the same reference numerals, and description thereof is omitted.

In the liquid crystal display device 1, two types of resin projections 50 and 51 are formed on the substrate 17 of the CF substrate 11, but in the liquid crystal display device 2, the taper angle θ ₁ is small and the inclination of the side surface is gentle. Only one type of the plurality of resin protrusions 50 is formed. The opposing electrode 40 is formed by patterning except for some of the resin protrusions 50. By doing so, conductive protrusions 42 covered with the counter electrode 40 and spacers 52 not covered with the counter electrode 40 are formed on the CF substrate 11 of the liquid crystal display device 2.

The spacer 52 is provided in the display area, but is covered with the counter electrode 40.
Even when the pixel electrode 36 contacts the zero pixel electrode 36, the pixel electrode 36 and the counter electrode 40 do not conduct. On the other hand, the conductive protrusions 42 covered with the counter electrode 40 are provided on
11 is provided at a position in contact with a position 33 where the common bus lines 32 of the TFT substrate 10 are bundled when the substrates 11 are bonded.
Therefore, when the substrates 10 and 11 are bonded together, the conductive protrusions 4
2, the counter electrode 40 and the common bus line 32 are electrically connected.

In the liquid crystal display device 1 described above, it is necessary to form two types of resin projections 50 and 51. In the present embodiment, however, one type of taper angle θ ₁ is small and the side surface is gentle. The conductive protrusion 42 and the spacer 52 can be formed from the protrusion 50. However, in the present embodiment, C
When forming the F substrate 11, it is necessary to add a step of patterning the counter electrode 40.

In the method of driving the device by inputting the same signal as that of the common bus line 32 to the auxiliary capacitor 35 as in the case of the TFT substrate 10, no matter where the connection is made on the common bus line 32, the opposing electrode 40 is connected. And the common bus line 32 can be electrically connected.

FIG. 8 is a sectional view showing a liquid crystal display device 3 according to still another embodiment of the present invention, and FIG. 9 is a plan view showing a TFT substrate 10 of the liquid crystal display device 3. In the liquid crystal display device 3, the same components as those of the liquid crystal display device 1 are denoted by the same reference numerals, and description thereof is omitted.

In the liquid crystal display device 1 and the liquid crystal display device 2, the conductive protrusion 42 is formed at a position outside the display area opposite to the position 33 where the common bus lines 32 are bundled. Conductive protrusion 42
Is formed. The conductive projection 42 of the liquid crystal display device 3 is formed at a position that contacts the position 60 on the common bus line 32 of the TFT substrate 10 when the substrates 10 and 11 are bonded. Further, the pixel electrode 36 of the TFT substrate 10 is
Are removed by patterning. For this reason,
When the substrates 10 and 11 are attached to each other, the conductive protrusion 42 and the common bus line 32 can be brought into contact with each other without conducting the pixel electrode 36 and the opposing electrode 40.
0 and the common bus line 32 can be electrically connected.

The conductive projections 42 have a predetermined height and can be arranged in the display area.
The interval between 0 and 11 can be kept constant. Therefore, in the liquid crystal display device 3, or to form a spacer 43 to form a larger projection 51 of the taper angle theta ₂ to the liquid crystal display device 1, by patterning the counter electrode 40 as the liquid crystal display device 2 spacer 52 Need not be formed. In the liquid crystal display device 3, the conductive protrusions 42 of the CF substrate 11 are provided.
Is the common bus line 3 of the TFT substrate 10 in the display area.
2, the pattern for connecting the common bus line 32 outside the display area of the TFT substrate 10 becomes unnecessary,
The frame area of the TFT substrate 10 can be reduced.

Next, the present invention is applied to a high aperture ratio liquid crystal display device in which an interlayer insulating film made of an organic material is disposed between a TFT element and a pixel electrode on a TFT substrate, and the pixel electrode is formed up to a bus line. The case where the method is applied will be described. FIG.
FIG. 11 is a sectional view showing a liquid crystal display device 4 according to still another embodiment of the present invention.
FIG. 3 is a plan view showing a substrate 80. In the liquid crystal display device 4, the same components as those of the liquid crystal display device 1 are denoted by the same reference numerals, and description thereof is omitted. Liquid crystal display 4
Are the CF substrate 11 and the TFT substrate 80 facing each other.
The substrates 80 and 11 are bonded together with a sealing material, and the liquid crystal 14 is sealed between the substrates 80 and 11.

The TFT substrate 80 has a transparent substrate 18 on which a TFT
An FT element 34, a source bus line 30, a gate bus line 31, and a common bus line 32 are formed, on which an interlayer insulating film 70 made of an organic material, a pixel electrode 71, and an alignment film (not shown) are laminated in this order. .
The pixel electrode 71 is electrically connected to a drain electrode of the TFT element 34 by a contact hole 72 formed in the interlayer insulating film 70. In the TFT substrate 80, the TFT element 34 and the bus line 30,
Since the pixels 31 and 32 are covered, the pixel electrodes 71 can be formed up to the bus lines 30, 31, and 32, thereby increasing the aperture ratio. The details of the liquid crystal display device having a high aperture ratio such as the liquid crystal display device 4 are described in
No. 292,626.

On the CF substrate 11 facing the TFT substrate 80 thus configured, a plurality of conductive projections 42 covered by the counter electrode 40 are formed. Conduction projection 42
Are opposed to a position 33 on the TFT substrate 80 outside the display area where the common bus lines 32 are bundled and a position 73 where the source bus line 30 and the gate bus line 31 of the TFT substrate 80 intersect in the display area. Formed at the position where

At the position 33 where the common bus lines 32 of the TFT substrate 80 are bundled, the interlayer insulating film 70 and the pixel electrode 7
Since 1 is not formed, the conductive protrusion 42 and the common bus line 32 can be brought into contact, and the counter electrode 40 and the common bus line 32 can be electrically connected. The pixel electrode 71 in the display area of the TFT substrate 80 is
The portion facing the conductive protrusion 42 is removed by patterning as shown at a position 73 in FIG. 11 so as not to be conductive with the conductive protrusion 42 of the CF substrate 11. For this reason, the conductive protrusion 42 in the display area has a T
It contacts the interlayer insulating film 70 of the FT substrate 80 and functions as a spacer for maintaining a cell gap. Therefore, in the liquid crystal display device 4, as in the liquid crystal display device 1, the taper angle θ ₂
It is not necessary to form the spacer 43 by forming the projection 51 having a large size, or to form the spacer 52 by patterning the counter electrode 40 unlike the liquid crystal display device 2.

[0052]

As described above, according to the present invention, a projection is provided on one of the substrates before the formation of the alignment film and the counter electrode, and the counter electrode is formed thereon to maintain the interval between the two substrates. Since the spacers and the conductive projections for electrically connecting the two substrates are formed, the conventional process of applying the conductive paste and dispersing the spacers can be performed simultaneously, and the manufacturing cost can be reduced. In addition, since the conductive protrusions and the spacers are formed before forming the alignment film, foreign substances can be prevented from adhering to the substrate, and the yield is improved.

Further, in the present invention, the electrical connection between the two substrates made by the conductive paste is made by the conductive projections according to the present invention, so that the electrical connection between the substrates can be made surely and the poor connection can be prevented. . Further, since the conductive projection of the present invention can be formed in a predetermined shape, unlike the conventional conductive paste, it is possible to prevent a decrease in display quality due to a difference in electric resistance value or unevenness in substrate spacing.
Further, since the spacer of the present invention can be easily formed at a predetermined position, it is possible to prevent unevenness in the interval between the substrates and to prevent deterioration in display quality.

Further, according to the present invention, the conductive projection has a gentle slope on the side face, so that the side face is completely covered with the counter electrode, and the electrical connection is reliably made from the top to the bottom. For this reason, conduction failure between the two substrates can be prevented.

Further, according to the present invention, since the spacer has a steep side surface of the protrusion, even if the counter electrode is formed uniformly on the substrate, the counter electrode is not formed on the side surface, and the top and bottom are not formed. The electrical connection with the bottom is interrupted. For this reason, even if the spacer contacts the pixel electrode on the other substrate, the counter electrode and the pixel electrode do not conduct. Therefore, in the present invention, the step of patterning the counter electrode can be omitted.

Further, according to the present invention, the counter electrode is formed by patterning so that the counter electrode is not formed on the spacer. Does not conduct.

Further, according to the present invention, since the conductive protrusion is formed at a position on the other substrate which does not contact the pixel electrode, it is possible to prevent the pixel electrode from conducting to the opposing electrode covering the conductive protrusion. .

Further, according to the present invention, the pixel electrode on the other substrate is patterned so that the conductive protrusion does not contact the pixel electrode, thereby preventing the pixel electrode from conducting to the opposing electrode covering the conductive protrusion. be able to. For this reason, the range in which the conductive protrusion can be formed can be widened, and the conductive protrusion can maintain a uniform substrate interval.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a liquid crystal display device of the present invention having a conductive protrusion 12 and a spacer 13. FIG.

FIG. 2 is a cross-sectional view showing a procedure for manufacturing a projection 15 of the CF substrate 11.

FIG. 3 is a sectional view showing a liquid crystal display device 1 according to an embodiment of the present invention.

FIG. 4 is a plan view showing a TFT substrate 10 of the liquid crystal display device 1.

FIG. 5 is a cross-sectional view showing a procedure for manufacturing the conductive protrusion 42 and the spacer 43.

FIG. 6 is a plan view showing an arrangement position of protrusions 50 and 51.

FIG. 7 is a liquid crystal display device 2 according to another embodiment of the present invention.
FIG.

FIG. 8 is a sectional view showing a liquid crystal display device 3 according to still another embodiment of the present invention.

FIG. 9 is a plan view showing a TFT substrate 10 of the liquid crystal display device 3.

FIG. 10 is a sectional view showing a liquid crystal display device 4 according to still another embodiment of the present invention.

FIG. 11 is a plan view showing a TFT substrate 80 of the liquid crystal display device 4.

FIG. 12 is a flowchart showing a procedure for manufacturing a conventional liquid crystal display device.

[Explanation of symbols]

 1, 2, 3, 4 Liquid crystal display device 10, 80 TFT substrate 11 CF substrate 12, 42 Conduction protrusion 13, 43, 52 Spacer 14 Liquid crystal 15, 50, 51 Resin protrusion 17 Substrate 18, 19 Transparent substrate 20 Protective film Reference Signs List 21 resist 22 mask plate 23 mask 24 color filter layer 30 source bus line 31 gate bus line 32 common bus line 34 TFT element 35 auxiliary capacitance 36, 71 pixel electrode 40 counter electrode 41 sealant 70 interlayer insulating film 72 contact hole

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Waka Nobuhiro 22-22, Nagaikecho, Abeno-ku, Osaka, Osaka Inside Sharp Corporation (72) Inventor Koichi Tori 22-22, Nagaikecho, Abeno-ku, Osaka, Osaka Sharp (72) Inventor Eiichiro Nishimura 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Japan Sharp Corporation (72) Inventor Tsuneo Nakamura 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation F Terms (reference) 2H089 LA10 LA12 MA03X NA14 QA14 QA16 TA02 TA09 2H092 JA24 JB01 JB13 NA01 NA27 NA29 PA03 PA08 PA09 5C094 AA04 AA42 AA43 AA44 BA03 BA44 CA19 DB05 EA02 EA04 EA07 EC03 FB12 HA08

Claims (6)

[Claims] In a liquid crystal display device in which liquid crystal is interposed between two substrates, a plurality of projections are formed on one of the substrates, and a counter electrode is formed on the projections. A liquid crystal display device comprising a spacer for maintaining a gap and a conductive projection for electrically connecting two substrates. 2. The conductive projection is formed by forming an opposing electrode on a projection having a gentle slope on a side surface so as to be electrically connected from the top to the bottom of the projection. 2. The liquid crystal display device according to 1. 3. The spacer according to claim 1, wherein the spacer is formed by forming an opposing electrode on a protrusion having a steeply inclined side surface, so that an electrical connection between a top and a bottom of the protrusion is cut off. Item 3. The liquid crystal display device according to item 1 or 2. 4. The liquid crystal according to claim 1, wherein the opposing electrode is formed by patterning to form a conductive projection covered by the opposing electrode and a spacer not covered by the opposing electrode. Display device. 5. The liquid crystal display device according to claim 1, wherein the conductive protrusion is formed at a position on the other substrate that does not contact the pixel electrode. 6. In a liquid crystal display device in which liquid crystal is interposed between two substrates, a plurality of protrusions are formed on one of the substrates, and a counter electrode is formed on the plurality of protrusions. Conductive projections are formed to maintain the gap and electrically connect the two substrates, and the pixel electrodes of the other substrate are patterned so that the conductive projections do not contact the pixel electrodes of the other substrate. Liquid crystal display device.