JP3480682B2 - Liquid crystal display - Google Patents

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, and more particularly, to an active matrix drive type device suitable for application to flat panel displays such as personal digital assistants, notebook type personal computers and digital cameras. The present invention relates to a liquid crystal display device.

[0002]

2. Description of the Related Art Today, liquid crystal display devices are widely applied to various products such as word processors, notebook type personal computers, portable information terminals and the like by taking advantage of their thinness, light weight and low power consumption. In particular, an active matrix type liquid crystal display device in which active elements such as thin film transistors (hereinafter referred to as TFTs) are used as switching elements and pixels are arranged in a matrix is used for products requiring high display quality.

A conventional transmissive active matrix liquid crystal display device includes an active matrix substrate in which an active matrix element is formed on a translucent substrate, and an opposite substrate in which color filter layers of red, green, blue, etc. are formed. The liquid crystal layer is sandwiched between the active matrix substrate and the counter substrate.

As shown in FIG. 5, a pixel electrode 51 for applying a voltage to the liquid crystal layer and a TFT 52 which is a switching means for driving the pixel electrode 51 are arranged in a matrix on the active matrix substrate. And the TFT 52 is connected to the pixel electrode 51.

The gate electrodes of the TFTs 52 located in the same row are connected to the same scanning line 53, respectively.
The source electrodes of the TFTs 52 located in the same column are connected to the same signal line 54, respectively. Each TFT 52
The drain electrode in is connected to each pixel electrode 51.

That is, the scanning line 53 provided in each row and the signal line 54 provided in each column are arranged so as to pass around the pixel electrode 51 and be orthogonal to each other.

In the above structure, the gate signal is controlled via the scanning line 53 to turn on / off the TFT 52.
When the TFT 52 is turned off and a data signal (display signal) is input to the signal line 54 when the TFT 52 is turned on, the TFT 52 is turned off.
The data signal is input to the pixel electrode 51 via 52. Further, the drain electrode of the TFT 52 is connected to the pixel electrode 51 and the additional capacitor 55. The additional capacitor 55 and the counter electrode on the counter substrate side are connected to a common wiring 56, respectively. The additional capacitor 55 is connected in parallel with the liquid crystal layer and plays a role of holding the voltage applied to the liquid crystal layer.

Next, a specific structure of the TFT 52 is shown in FIG. A gate electrode 62 is formed on a transparent insulating substrate 61, and a gate insulating film 63 is formed so as to cover the gate electrode 62. The semiconductor thin film 64 is formed on the gate electrode 62 via the gate insulating film 63. A channel protective film 65 is formed on the upper center of the semiconductor thin film 64. A source electrode 66a made of a microcrystalline n + silicon layer is formed on the source side (left side in the figure) of the channel protective film 65 and the semiconductor thin film 64, and a microcrystalline n + silicon layer is also formed on the drain side (right side in the figure). The drain electrode 66b is formed. The metal layer 67a serving as the source wiring is connected to the source electrode 66a, and the metal layer 67b serving as the drain wiring is connected to the drain electrode 66b.

The surface of the TFT 52 is covered with an interlayer insulating film 68, and a transparent conductive film to be the pixel electrode 51 is formed on the interlayer insulating film 68. The pixel electrode 51 is connected to the above-mentioned T via the contact hole 69.
It is connected to the metal layer 67b that will be the drain wiring of the FT 52. Although not shown, an alignment film for aligning the liquid crystal is formed on the pixel electrode 51 almost uniformly over the entire display area.

As the interlayer insulating film 68, a CVD (C
(hemal vapor Deposition)
An inorganic thin film such as silicon nitride (SiN) formed by a CVD method or the like is used, and as the semiconductor thin film 64, hydrogenated amorphous silicon (a-Si: formed by a CVD method or the like:
H) is used.

As another structure of a conventional liquid crystal display device different from the above, a liquid crystal display device in which a signal line is formed on the counter substrate side has been proposed (Japanese Patent Laid-Open No. 7-20495, etc.). In this structure, the scanning lines and the signal lines do not intersect each other on the common substrate and are formed on different substrates, so that the occurrence rate of line defects can be reduced and the yield can be improved.

The structure of the liquid crystal display device in which the signal line is formed on the counter substrate side will be described below with reference to FIG.

In the above liquid crystal display device, a three-terminal switching element 71 such as an amorphous silicon semiconductor and a pixel electrode 74 are formed in a matrix on a substrate 70 which is a pixel substrate, and a scanning line 72 and a reference signal line are provided. 73
And are arranged in parallel with each other. Each first terminal of each three-terminal switching element 71 arranged in the same row is connected to the same scanning line 72, and each second terminal of each three-terminal switching element 71 arranged in the same row has the same reference signal. It is connected to the line 73. The third terminal of each three-terminal switching element 71 is connected to each pixel electrode 74.

On the counter substrate 75 facing the substrate 70,
A plurality of signal lines 76 are arranged in a direction orthogonal to the scanning lines 72 and the reference signal lines 73. Further, the signal line 76 is arranged in a portion facing the pixel electrode 74 and also serves as a counter electrode.

[0015]

However, in the configuration of the conventional liquid crystal display device shown in FIGS. 5 and 6, the insulating substrate 61 in which the scanning lines 53 and the signal lines 54 are transparent is used.
The scanning lines 53 are arranged so as to pass through the pixel electrodes 51 arranged in a matrix and are orthogonal to each other, and the scanning lines 53 are formed at a number of intersections where the scanning lines 53 and the signal lines 54 intersect. The signal line 54 is laminated on the top of the stepped mirror so as to reflect the stepped shape. Therefore, at such intersections, the interlayer insulating film 68 is likely to be cracked, and the upper-layer signal line 54 is likely to be disconnected during manufacturing, which causes a decrease in reliability and a decrease in yield. Further, if there is a pinhole in the interlayer insulating film 68, there is also a problem that the signal line 54 in the upper layer and the scanning line 53 in the lower layer are short-circuited to reduce the yield.

In order to solve the above problems, a liquid crystal display device in which a signal line is formed on the counter substrate side is disclosed in Japanese Patent Laid-Open No. 7-2049.
It is proposed in Japanese Patent Publication No. 5 and the like. In the configuration of the liquid crystal display device in which the signal line is formed on the opposite substrate side, the scanning line and the signal line are formed on different substrates without crossing each other on the same substrate. Is reduced and the yield is improved.

However, in JP-A-7-20495, the scanning line and the reference signal line are arranged adjacent to each other. Usually, the width of the scanning line and the reference signal line is as thin as several tens of μm or less and the length thereof is several m or more. Since hundreds or more of such scanning lines and reference signal lines are formed adjacent to each other at intervals of ten and several μm, line leakage easily occurs due to etching failure during the pixel substrate manufacturing process. However, display defects due to line defects and a decrease in yield occur. Particularly in a large-sized liquid crystal display device, since the scanning line and the reference signal line are long, line-to-line leak is more likely to occur and the yield is reduced.

The present invention has been made in view of the above problems, and provides a liquid crystal display device having a high reliability and a high display quality while reducing the leak between lines to improve the yield and reduce the cost. The task is to do.

[0019]

In order to solve the above-mentioned problems, a liquid crystal display device according to claim 1 has a three-terminal switching element arranged in a matrix and a first terminal of the three-terminal switching element. It connected the pixel electrode connected to the third terminal of the second is connected to the terminal in parallel disposed between Rutotomoni the scanning line reference signal line and the three-terminal switching element of the scan line and the three-terminal switching element A pixel substrate having a pixel electrode, a counter electrode facing each of the pixel electrodes, and a signal line connected to the counter electrode so as to intersect with the scanning line and facing the pixel substrate. a counter substrate disposed Te, the liquid crystal display device and a liquid crystal layer sandwiched between the pixel substrate and the opposed substrate, one pixel electrode is composed of at least two split pixel electrodes, the above査線a and the reference signal lines are arranged alternately across each row of the divided pixel electrodes, each of the divided pixel
The electrodes are different 3-terminal switches corresponding to each divided pixel electrode.
It is connected to the third terminal of the
Each of the first terminals of the child switching elements has the above-mentioned divided pixel electrode.
Connected to the scan line that runs between
Each second terminal of the pendant element is connected between the divided pixel electrodes.
Connected to different reference signal lines adjacent to the scanning line
The scanning line and the reference signal line are arranged with an insulating layer, which is an insulating film, interposed between them.
It is characterized by being placed .

According to the above arrangement, the scanning line and the reference signal line formed on the pixel substrate side are formed in parallel,
Further, since the signal line is formed on the opposite substrate side so as to intersect with the scanning line, each wiring does not intersect on the same substrate. As a result, the line defect occurrence rate such as disconnection or short circuit, which is likely to occur at the intersection where each wiring intersects on the same substrate, is reduced, and the yield at the time of manufacturing the pixel substrate is improved to reduce the cost and the liquid crystal. The reliability of the display device is also improved.

Further, according to the above configuration, the pixel electrode is divided into the divided pixel electrodes, and the scanning line and the reference signal line are alternately arranged with the divided pixel electrode sandwiched in each row. Neither the scanning line nor the reference signal line is adjacent to each other. As a result, line leakage that occurs due to etching defects during the pixel substrate manufacturing process is less likely to occur, so that the yield at the time of manufacturing the pixel substrate is improved, the manufacturing cost is reduced, and the reliability of the liquid crystal display device is also improved. .

Further, according to the above arrangement, the pixel electrode is divided into at least two divided pixel electrodes, so that one pixel is displayed by at least two divided pixels.
As a result, even if a defect occurs in one of the divided pixel electrodes, the pixel lacking state does not occur, and it is possible to suppress the deterioration of display quality.

Further, in the structure of claim 1, the scanning line includes a main scanning line and a scanning terminal, the reference signal line includes a main reference signal line and a reference signal terminal, and the scanning terminal and the reference signal. The terminals and the terminals may be arranged on different planes with the insulating film interposed therebetween.

According to the above structure, the scanning terminal and the reference signal terminal are arranged on different planes in the vicinity of the three-terminal switching element with the insulating film interposed therebetween. Since the line leakage that occurs is further unlikely to occur, the yield at the time of manufacturing the pixel substrate is improved, the manufacturing cost is reduced, and the reliability of the liquid crystal display device is also improved.

A liquid crystal display device according to a second aspect is the first aspect.
In the above configuration, the 3-terminal switching element is formed of an amorphous silicon semiconductor.

According to the above construction, by using the amorphous silicon which is relatively easy to increase in area, it is possible to form a three-terminal switching element having a large area and uniform characteristics, thus further improving the display quality. Can be improved.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] An embodiment of the present invention will be described with reference to FIGS. 1 to 3.
It is as follows.

FIG. 1 shows a schematic view of the structure on the pixel substrate side in the liquid crystal display device according to the present embodiment.
FIG. 2 shows a sectional view taken along a plane along the line.

As shown in FIG. 1, on the pixel substrate 10,
Pixel electrodes 11 and three-terminal switching elements 12 for driving the pixel electrodes 11 are formed in a matrix. The pixel electrode 11 is composed of four rectangular divided pixel electrodes 11a, 11b, 11c and 11d which are substantially the same shape, and the four divided pixel electrodes 11a, 11b and 1 are formed.
1c and 11d are arranged so as to be symmetrical with respect to the top, bottom, left and right.

The switching element 12 has four divided switching elements 12a, 12b, 12 corresponding to the divided pixel electrodes 11a, 11b, 11c, 11d.
It is composed of c and 12d. Each third terminal of the four divided switching elements 12a, 12b, 12c, 12d has a corresponding divided pixel electrode 11a, 11b, 11
c and 11d, respectively.

That is, in the liquid crystal display device according to this embodiment, four divided pixel electrodes 1 are used for displaying one pixel.
1a, 11b, 11c, 11d and four split switching elements 12a, 12b, 12c, 12d are used.

The scanning line 13 is a main scanning line 14 and the divided switching elements 12a, 12b, 12 for each pixel.
It is composed of four scanning terminals 15a, 15b, 15c and 15d formed so as to correspond to c and 12d. Each of the scanning terminals 15a, 15b, 15c, 15d is
The corresponding divided switching elements 12a, 12b,
12c and 12d are respectively connected to the respective first terminals.

The first reference signal line 16 is the first main reference signal line 1
7 and first reference signal terminals 18a and 18b. Each of the first reference signal terminals 18a and 18b is connected to a second terminal of two different switching elements 12 (the other switching element is not shown) arranged in the same column and in a row adjacent to each other. There is. That is, the first reference signal terminal 18a is composed of the two divided pixel electrodes 11a, 1a which are adjacent to each other in the row direction and which constitute the pixel electrode 11.
Two divided switching elements 12a and 12b which pass between 1b and are connected to the divided pixel electrodes 11a and 11b.
Is connected to the second terminal of the.

Like the first reference signal line 16, the second reference signal line 19 is also connected to the second main reference signal line 20 and the second reference signal terminal 2.
It is composed of 1a and 21b. The second reference signal terminals 21a and 21b are also connected to the first reference signal terminals 18a and 18a, respectively.
Similar to 18b, they are respectively connected to the second terminals of two different switching elements 12 (the other switching element is not shown) arranged in the same column and in a row adjacent to each other. That is, the second reference signal terminal 21b is
The second of the two divided switching elements 12c and 12d, which constitute the pixel electrode 11 and pass between the two divided pixel electrodes 11c and 11d adjacent in the row direction and are connected to the divided pixel electrodes 11c and 11d, It is connected to the terminal.

As described above, in the liquid crystal display device according to the present embodiment, the first reference signal terminal 18a is divided into two split switching elements 12a and 12b, and the second reference signal terminal 21b is divided into two. , 12d, respectively.

The main scanning line 14 and the first main reference signal line 1
7 and the second main reference signal line 20 are arranged substantially parallel to each other without crossing each other, that is, arranged in parallel. The first main reference signal line 17 and the second main reference signal line 20 are arranged so as to extend in the row direction with the pixel electrode 11 interposed therebetween. The main scanning line 14 divides the pixel electrode 11 into upper and lower parts, that is, the divided pixel electrode 1
The pixel electrodes 1a and 11b and the divided pixel electrodes 11c and 11d are arranged so as to extend in the row direction.

As described above, in the liquid crystal display device according to the present embodiment, the first main reference signal line 17, the second main reference signal line 20, and the main scanning line 14 are divided pixel electrode 11
A, 11b, 11c, and 11d are sandwiched in each row, and are alternately arranged. Therefore, the main scanning line 14,
Neither the first main reference signal line 17 nor the second main reference signal line 20 are adjacent to each other.

Next, the divided switching elements 12a, 12
The detailed structure of b will be described with reference to FIG. By forming a metal film of aluminum, tantalum, or the like on the transparent insulating substrate 22 by a sputtering method or the like, the scanning terminal 15
a and 15b are formed. On the upper layers of the scanning terminals 15a and 15b, silicon nitride (Si
N) is formed on the insulating layer 23, and semiconductor layers 24a, 24b and n + made of amorphous silicon are further formed.
Type contact layers 25a and 25b made of amorphous silicon
Are formed in this order at corresponding positions on the scanning terminals 15a and 15b, respectively.

Further, the insulating layer 23 and the semiconductor layer 2 are
By depositing a single-layer metal film of tantalum, molybdenum or the like or a laminated metal film of titanium / aluminum, tantalum / tantalum nitride, etc. on the upper layers 4a, 24b and the contact layers 25a, 25b by sputtering or the like. The one reference signal terminal 18a and the metal layers 26a and 26b are formed. The first reference signal terminal 18a is commonly arranged between the divided switching elements 12a and 12b,
The metal layer 26a is arranged on the formation side of the divided pixel electrode 11a, and the metal layer 26b is arranged on the formation side of the divided pixel electrode 11b.

After that, the divided switching elements 12a, 1
The semiconductor layers 24a, 2 corresponding to the channel portion of 2b.
The n + type amorphous silicon of 4b is removed by dry etching or the like, and silicon nitride is formed on the first reference signal terminal 18a, the metal layers 26a and 26b and the semiconductor layers 24a and 24b by plasma CVD. An insulating layer 27 made of is formed.

After forming a through hole in the insulating layer 27 above the metal layers 26a and 26b, the sputtering method or the like is used.
Split pixel electrodes 11a and 1a made of a transparent conductive film such as ITO
1b is formed. The divided pixel electrodes 11a and 11b are
By connecting to the metal layers 26a and 26b through the through holes, respectively, the switching elements 12a and 12b are connected.
b is constructed.

Next, the relationship between the pixel substrate 10 and the counter substrate 30 according to this embodiment will be described with reference to FIG.

A positional relationship between the counter electrode 31 and the signal line 32 formed on the counter substrate 30 and the pixel substrate 10 is shown in FIG. The counter electrode 3 is provided on the counter substrate 30 side.
1 and a signal line 32 connected to the counter electrode 31 are formed. The counter electrode 31 is 1 on the pixel substrate 10 side.
It is arranged so as to overlap with one pixel electrode 11 (see FIG. 1). The signal line 32 is arranged so as to be orthogonal to the scanning line 13 formed on the pixel substrate 10 side.

In the liquid crystal display device according to the present embodiment, the surface of the pixel substrate 10 on which the switching elements 12 are formed in a matrix and the surface of the counter substrate 30 on which the counter electrode 31 and the signal line 32 are formed. After forming an alignment film (not shown) and performing an alignment treatment, a liquid crystal layer (not shown) is sandwiched between the pixel substrate 10 and the counter substrate 30.

Image display in the liquid crystal display device according to this embodiment will be described below. The divided switching elements 12a forming the switching element 12,
ON / OFF control of 12b, 12c, 12d is performed by controlling the gate signal through the scanning line 13 connected to the divided switching elements 12a, 12b, 12c, 12d.

Split switching elements 12a, 12b, 1
2c and 12d turn on at the same time by inputting the gate signal
At this time, since the same voltage is applied to all the reference signal lines at the same time, the same voltage applied to the first reference signal line 16 and the second reference signal line 19 is applied to the four divided pixel electrodes 11a and 11b. , 11c, 11d. The data signal (display signal) input to the signal line 32 formed on the counter substrate 30 side is applied to the counter electrode 31. The difference between the voltage applied to the divided pixel electrodes 11a, 11b, 11c and 11d and the voltage applied to the counter electrode 31 is applied to the liquid crystal layer. The alignment state of the liquid crystal layer changes according to the level of the applied voltage. Therefore, an image can be displayed by converting a change in the alignment state of the liquid crystal layer into a change in the amount of light.

As described above, the liquid crystal display device according to the present embodiment has four divided pixel electrodes 11a, 11b, 11c,
11d simultaneously displays an image with the same data signal and displays one pixel.

As described above, according to the structure of the liquid crystal display device of this embodiment, the main scanning line 14, the first main reference signal line 17 and the second main reference signal formed on the pixel electrode 10 are formed. Scan line 1 since lines 20 are not adjacent
3, the occurrence of inter-line leakage between the first reference signal line 16 and the second reference signal line 19 is prevented, and the yield in manufacturing the pixel substrate 10 is improved.

Further, the main scanning line 14 and the first main reference signal line 1
7 and the second main reference signal line 20 are arranged substantially parallel to each other, and the signal line 32 arranged substantially orthogonal to the main scanning line 14 is arranged to face the pixel substrate 10. Since it is formed on the opposing substrate 30, the wirings do not intersect with each other on the same substrate. Therefore, in the liquid crystal display device according to the present embodiment, it is possible to prevent disconnection or cracking at the intersection where the wirings intersect with each other, improve the yield in manufacturing the pixel substrate 10, and improve the reliability.

Further, in the liquid crystal display device according to the present embodiment, one pixel which is conventionally displayed by one pixel electrode is divided into four divided pixel electrodes 11a, 11b, 11c and 11.
Since it is displayed by d, the four divided pixel electrodes 11a and 11
Even if a defect occurs in one of the divided pixel electrodes of b, 11c, and 11d, one pixel as a whole cannot be displayed, and a defective pixel state does not occur, preventing deterioration of display quality and maintaining good display quality. You can

Generally, as the area of one divided pixel electrode occupying one pixel is smaller, even if one of the divided pixel electrodes has a defective display, the defective display portion becomes less noticeable. Therefore, in order to prevent display quality deterioration,
It is desirable to divide one pixel as finely as possible. As described above, in the present embodiment, one pixel is divided into four divided pixel electrodes 11a, 11b, 11c, and 11d, so that a display quality higher than that in the case where one pixel is divided into two. It is possible to prevent deterioration and maintain good display quality.

Further, in the liquid crystal display device according to the present embodiment, the scanning terminals 15a and 15b and the first reference signal terminal 18a are arranged in the vicinity of the divided switching elements 12a and 12b with the insulating layer 23 being an insulating film interposed therebetween. And are not coplanar. As a result, in the liquid crystal display device according to the present embodiment, it is possible to further reduce the occurrence of line leakage between the scanning line 13 and the first reference signal line 16, and further improve the yield at the time of manufacturing the pixel substrate 10. The cost can be reduced. Further, with the same configuration, it is possible to reduce the occurrence of line leakage between the scanning line 13 and the second reference signal line 19, further improve the yield at the time of manufacturing the pixel substrate 10, and reduce the cost. .

Further, since the semiconductor layers 24a and 24b of the pixel substrate 10 in the liquid crystal display device according to the present embodiment are formed of amorphous silicon, the split switching elements 12a and 12b having a large area and uniform characteristics can be obtained. 12
Since the c and 12d can be formed, the display quality can be further improved.

Although a color filter is not shown in FIG. 3, the counter substrate 30 is used for color display.
The color filter may be arranged on the side of the pixel substrate 10 or on the side of the pixel substrate 10.

Further, in the liquid crystal display device according to the present embodiment, the twisted nematic (TN) mode is used as the display mode of the liquid crystal layer, but the present invention is not limited to this, and other display modes may be used. Good.

[Second Embodiment] A second embodiment of the present invention will be described with reference to FIG. The same components as those described in the first embodiment will be designated by the same reference numerals and the description thereof will be omitted.

FIG. 4 shows another example of the pixel substrate 10 according to the first embodiment of the present invention described above. In the present embodiment, as shown in FIG. 4, pixel electrodes 41 and three-terminal switching elements 42 for driving the pixel electrodes 41 are formed in a matrix on the pixel substrate 40.
The pixel electrode 41 is composed of two divided pixel electrodes 41a and 41b that are adjacent to each other in the column direction and have substantially the same shape. The switching element 42 includes the divided pixel electrodes 41a and 4
2 divided switching elements 4 so as to correspond to 1b.
2a, 42b.

The two divided switching elements 42a, 4
Each of the third terminals 2b corresponds to the corresponding divided pixel electrode 41.
a and 41b, respectively.

That is, in the liquid crystal display device according to the present embodiment, two divided pixel electrodes 4 are provided for displaying one pixel.
1a, 41b and two split switching elements 42a, 4
2b and 2b are used.

The scanning line 43 is composed of a main scanning line 44 and two scanning terminals 45a and 45b formed corresponding to the divided switching elements 42a and 42b per pixel. The scanning terminals 45a and 45b are respectively connected to the first terminals of the corresponding divided switching elements 42a and 42b.

The first reference signal line 46 is the first main reference signal line 4
7 and first reference signal terminals 48a and 48b. Each of the first reference signal terminals 48a and 48b is connected to a second terminal of two different switching elements 42 arranged in the same column and in a row adjacent to each other. That is, the first reference signal terminal 48a is connected to the second terminal of the divided switching element 42a connected to the divided pixel electrode 41a forming the pixel electrode 41.

Like the first reference signal line 46, the second reference signal line 49 also has the second main reference signal line 50 and the second reference signal terminal 5.
It is composed of 1a and 51b. Each of the second reference signal terminals 51a and 51b is also connected to the first reference signal terminal 48a,
Similar to 48b, they are respectively connected to the second terminals of two different switching elements 42 (the other switching element is not shown) arranged in the same column and in the row adjacent to each other. That is, the second reference signal terminal 51b is
It is connected to the second terminal of the divided switching element 42b connected to the divided pixel electrode 41b forming the pixel electrode 41.

As described above, in the liquid crystal display device according to the present embodiment, the first reference signal terminal 48a is connected to one split switching element 42a, and the second reference signal terminal 51b is connected to one split switching element 42b. It is configured to be.

Further, the main scanning line 44, the first main reference signal line 4
7 and the second main reference signal line 50 are arranged substantially parallel to each other without crossing each other, that is, arranged in parallel. The first main reference signal line 47 and the second main reference signal line 50 are arranged so as to extend in the row direction with the pixel electrode 41 interposed therebetween. The main scanning line 44 is arranged so as to divide the pixel electrode 41 into upper and lower parts, that is, so as to extend between the divided pixel electrodes 41a and 41b in the row direction.

As described above, in the liquid crystal display device according to the present embodiment, the first main reference signal line 47, the second main reference signal line 50 and the main scanning line 44 are divided pixel electrode 41.
It has a configuration in which a and 41b are alternately arranged with each row sandwiched. Therefore, the main scanning line 44, the first main reference signal line 4
Neither 7 nor the second main reference signal line 50 are adjacent to each other.

The configurations of the switching elements 42a and 42b and the configuration of the liquid crystal display device in the present embodiment are the same as the configurations of the switching elements 12a and 12b and the configuration of the liquid crystal display device in the first embodiment.

According to the structure of the liquid crystal display device of the present embodiment, the main scanning line 4 formed on the pixel electrode 40.
4, first main reference signal line 47 and second main reference signal line 50
Are not adjacent to each other, line-to-line leakage of the main scanning line 44, the first main reference signal line 47, and the second main reference signal line 50 is prevented, and the yield in manufacturing the pixel substrate 40 is improved. .

The main scanning line 44, the first main reference signal line 47 and the second main reference signal line 50 are arranged substantially parallel to each other, and are arranged substantially orthogonal to the main scanning line 44. Since the signal line 32 is formed on the counter substrate 30 which is arranged so as to face the pixel substrate 40, no crossing portion where the wirings cross each other is formed on the same substrate. Therefore, in the liquid crystal display device according to the present embodiment, it is possible to prevent disconnection and cracking due to the intersection of wirings, improve the yield at the time of manufacturing the pixel substrate 40, and improve the reliability.

Further, in the liquid crystal display device according to the present embodiment, by displaying one pixel, which was conventionally displayed by one pixel electrode, by the two divided pixel electrodes 41a, 41b, the divided pixel electrode 41a, Even if a defect occurs in one of the divided pixel electrodes of 41b, the entire pixel cannot be displayed in a pixel-missing state, so that it is possible to prevent deterioration of display quality and maintain good display quality.

As described above, the two divided pixel electrodes 41
By configuring one pixel electrode 41 with a and 41b, the number of switching elements can be reduced as compared with the case where one pixel is configured with four divided pixel electrodes.
It is possible to further prevent the occurrence of defects in the pixel substrate manufacturing process and further improve the non-defective rate.

In addition, in the above-described first embodiment and this embodiment, one pixel electrode is composed of two or four divided pixel electrodes, but the present invention is not limited to this, and the reference signal is not limited to this. As long as the gate signal and the data signal are applied in the same manner, one pixel electrode may be further composed of a plurality of divided pixel electrodes.

Further, in the above-described first embodiment and this embodiment, the scanning line and the reference signal line are arranged so as to sandwich the insulating layer which is an insulating film, but the present invention is not limited to this. The scanning line and the reference signal line may be simultaneously formed depending on the requirements of the manufacturing process.

[0073]

As described above, in the liquid crystal display device according to the invention of claim 1, the three-terminal switching elements arranged in a matrix and the scanning line connected to the first terminal of the three-terminal switching element are provided. a pixel substrate and a third pixel electrodes connected to the terminal of the second is connected to the terminal in parallel disposed between Rutotomoni the scanning line reference signal line and the three-terminal switching elements of the three-terminal switching element A counter electrode facing each of the pixel electrodes and a signal line connected to the counter electrode so as to intersect the scanning line,
A counter substrate which is arranged to face the pixel substrate, divided in the liquid crystal display device including a liquid crystal layer sandwiched, and one pixel electrode is at least two between the pixel substrate and the opposed substrate The scanning lines and the reference signal lines are alternately arranged with the divided pixel electrodes sandwiching each row, and each divided pixel electrode is formed by each divided image.
The third of the different 3-terminal switching elements corresponding to the elementary electrodes
Connected to the terminal, of the different 3 terminal switching element
Each first terminal is connected to a scanning line passing between the divided pixel electrodes.
Each of the second ends of the different 3-terminal switching elements
The child is adjacent to the scanning line passing between the divided pixel electrodes.
Is connected to the reference signal line
Are arranged so as to sandwich an insulating layer which is an insulating film .

As a result, the line defect occurrence rate such as disconnection or short circuit caused by the crossing of the scanning line, the reference signal line and the signal line on the same substrate is lowered, and further the scanning is performed. Since neither the line nor the reference signal line is adjacent to each other, a line-to-line leak caused by an etching defect or the like during the pixel substrate manufacturing process is less likely to occur, so that the yield at the time of manufacturing the pixel substrate is improved and the manufacturing cost is reduced. The liquid crystal display device can be reduced and the reliability of the liquid crystal display device can be improved.

Further, according to the above structure, the pixel electrode is divided into at least two divided pixel electrodes, so that one pixel is displayed by at least two divided pixels.
As a result, even if a defect occurs in one of the divided pixel electrodes, the pixel lacking state does not occur, so that it is possible to suppress deterioration of the display quality and maintain good display quality. .

In the liquid crystal display device according to the first aspect of the present invention, the scanning line includes a main scanning line and a scanning terminal, the reference signal line includes a main reference signal line and a reference signal terminal, and the scanning terminal includes or I configuration der which and the reference signal terminals are arranged on different planes sandwiching an insulating film.

As a result, in addition to the effect of the structure of claim 1, line leaks caused by etching defects and the like during the pixel electrode manufacturing process are further less likely to occur, so that the yield at the time of manufacturing the pixel substrate is improved and the manufacturing is improved. The cost is reduced and the reliability of the liquid crystal display device is improved.

A liquid crystal display device according to a second aspect of the present invention is such that the three-terminal switching element is formed of an amorphous silicon semiconductor.

As a result, in addition to the effect of the first aspect of the invention, it is possible to form a three-terminal switching element having a large area and uniform characteristics, so that the display quality can be further improved.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a configuration of a pixel substrate according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the pixel substrate is cut along a plane along the line AA in FIG.

FIG. 3 is a schematic plan view showing a configuration of a pixel substrate and a counter substrate according to the first embodiment of the present invention.

FIG. 4 is a schematic plan view showing a configuration of a pixel substrate according to a second embodiment of the present invention.

FIG. 5 is a schematic view showing a configuration of a conventional liquid crystal display device using an equivalent circuit.

FIG. 6 is a cross-sectional view showing a structure of a TFT used in a conventional liquid crystal display device.

FIG. 7 is a perspective view having a partially broken cross section schematically showing the configuration of another conventional liquid crystal display device.

[Explanation of symbols]

10 pixel substrate 11 Pixel electrode 11a split pixel electrode 11b split pixel electrode 11c split pixel electrode 11d split pixel electrode 12 switching elements 13 scan lines 14 main scan lines 15a Scanning terminal 15b Scanning terminal 15c scanning terminal 15d scanning terminal 16 First reference signal line (reference signal line) 17 First main reference signal line (main reference signal line) 18a First reference signal terminal (reference signal terminal) 18b First reference signal terminal (reference signal terminal) 19 Second reference signal line (reference signal line) 20 Second main reference signal line (main reference signal line) 21a Second reference signal terminal (reference signal terminal) 21b Second reference signal terminal (reference signal terminal) 23 Insulating layer (insulating film) 30 Counter substrate 31 Counter electrode 32 signal lines 40 pixel substrate 41 pixel electrode 41a split pixel electrode 41b split pixel electrode 42 switching element 43 scan lines 44 main scan line 45a scanning terminal 45b scanning terminal 46 First reference signal line (reference signal line) 47 First Main Reference Signal Line (Main Reference Signal Line) 48a First reference signal terminal (reference signal terminal) 48b First reference signal terminal (reference signal terminal) 49 Second reference signal line (reference signal line) 50 Second main reference signal line (main reference signal line) 51a Second reference signal terminal (reference signal terminal) 51b Second reference signal terminal (reference signal terminal)

Continuation of the front page (56) Reference JP-A-2-4291 (JP, A) JP-A-2-135318 (JP, A) JP-A-2-266330 (JP, A) JP-A-60-97322 (JP , A) JP-A-3-33724 (JP, A) JP-A-1-302229 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G02F 1/1368

Claims (2)

(57) [Claims] 1. A arranged in a matrix 3-terminal switching element and said third terminal second connected Rutotomoni the scanning lines to the terminals of the first scanning line connected to the terminal and the three-terminal switching element of the switching element And a pixel substrate having a reference signal line arranged in parallel with the pixel electrode connected to the third terminal of the three-terminal switching element, a counter electrode facing each of the pixel electrodes, and the scanning line. And a signal line arranged so as to be connected to the counter electrode so as to be sandwiched between the pixel substrate and the counter substrate. In a liquid crystal display device including a liquid crystal layer , one pixel electrode is composed of at least two divided pixel electrodes, and the scanning lines and the reference signal lines are alternately arranged with the divided pixel electrodes sandwiched in each row. Done , The divided pixel electrodes are different from each other.
Connected to the third terminal of the three-terminal switching element, each first terminal of the different three-terminal switching element is
Connected to a scanning line passing between the divided pixel electrodes, each second terminal of the different three-terminal switching element is
Different reference adjacent to the scanning line passing between the divided pixel electrodes
Connected to the signal line, the scanning line and the reference signal line sandwich an insulating layer that is an insulating film.
Liquid crystal display device characterized by being arranged in . 2. The three-terminal switching element is an amorphous silicon.
It is formed of a semiconductor material.
The described liquid crystal display device.