JPH0980477A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration in display quality due to potential fluctuation of a video line by constituting so that a wiring part from an output of a shift register or a buffer constituting a source drive circuit to a control input of an analog switch is provided without intersecting part with a video line. SOLUTION: The source drive circuit 133 arranges an analog switch array 139 between the arrangement area of the shift register 33a and the buffer 33b and the arrangement area 138 of respective video lines 212, 214, 216. That is, output wiring 203 from the buffer 33b is connected to a gate of a TFT constituting the analog switch 211 without intersecting with the video lines 212, 214, 216, and the wiring 209 from the drain of the TFT as the analog switch 211 to a source bus line 2 intersects with the video lines 212, 214, 216. Thus, the potential fluctuation on the video lines due to an output signal from the shift register or the buffer of the source drive circuit is prevented.

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 a liquid crystal display device in which a TFT array and a source drive circuit having an analog switch for sampling an analog data signal such as a video signal are integrally mounted. It is about.

[0002]

2. Description of the Related Art Conventionally, miniaturization of liquid crystal displays,
There is a technique for integrating a peripheral circuit with a liquid crystal display portion for the purpose of cost reduction.

FIG. 3 is a schematic plan view of a driver integrated liquid crystal display device having such a configuration. In the figure, reference numeral 200 denotes a driver-integrated liquid crystal display device, in which a gate drive circuit 32, a source drive circuit 33, and a TFT array section 24 are formed on a glass substrate or a quartz substrate 31.
A large number of parallel gate bus lines 1 extending from the gate drive circuit 32 are arranged in the TFT array section 24, and a large number of source bus lines 2 extending from the source drive circuit 33 are arranged orthogonally to the gate bus lines 1. It is set up. In addition, in the vicinity of each gate bus line 1, an additional capacitance common line 3 is arranged in parallel therewith.

Two adjacent gate bus lines 1
And the pixel area TFT 3 in each of the rectangular regions surrounded by the source bus line 2 and the additional capacitance common line 3.
5, a pixel 36, and an additional capacitor 37 are provided. T
The gate electrode of the FT 35 is connected to the gate bus line 1, and its source electrode is connected to the source bus line 2. Further, liquid crystal is filled between the picture element electrode connected to the drain electrode of the TFT 35 and the counter electrode on the counter substrate to form the picture element 36. Further, the additional capacitance common line 3 is connected to an electrode having the same potential as the counter electrode.

Here, the gate drive circuit 32 is composed of a shift register 32a and a buffer 32b.
Further, the source drive circuit 33 includes a shift register 33a.
, The buffer 33b, and the video lines 52, 54, 5
6 and an analog switch array 39 for sampling a video signal, and the output from the buffer 33b is input to the gate of the analog switch 39a. Reference numeral 38 is an arrangement portion of the above video lines. Here, the buffer 33b is not always necessary,
The output of the shift register 33a may be directly input to the gate of the analog switch 39a.

[0006]

The problems in the conventional liquid crystal display device will be described below.

FIG. 4A is a diagram showing the layout of the arrangement portion of the analog switches and video lines in FIG. However, in FIG. 4A, the vertical positional relationship is opposite to that in FIG. In addition, FIG.
It is a figure which shows the cross-section of the ff line part in (a), and demonstrates the manufacturing process of this part briefly.

First, a polycrystalline silicon thin film 41 is formed on an insulating substrate 31, and then a gate insulating film 42 is formed on the entire surface by using a CVD method or sputtering. Next, the input wiring portion 43 and the gate electrode 43a from the buffer 33b to the analog switch 39a, and the video line 52,
The signal input wiring 44 from 54 and 56 to the source of the analog switch 51 is formed by using metal such as Al or polycrystalline silicon. Next, P ⁺ is injected from the upper part of the gate electrode, and the non-doped channel region 45 is formed below the gate electrode.
To form After that, a first interlayer insulating film 46 is formed on the entire surface, a contact hole 47 is formed, and then an electrode 48,
49 and video lines 52, 54 and 56 are formed. The electrode 49 is connected to the source bus line. After that, the second interlayer insulating film 50 is formed on the entire surface. One end of the signal input wiring 44 is connected to the corresponding video line through the contact hole 55.

As shown in FIGS. 3 and 4, the output wiring 43 from the buffer 33b of the source driver 33 crosses the video lines 52, 54 and 56 and is a control input of an analog switch, that is, a TFT which constitutes an address switch.
It is supposed to reach the gate. Therefore, at the intersection 58 of the output line 43 and the video line, the capacitance Cg
v occurs. Further, the video line has a parasitic capacitance C due to a terminal or the like for inputting a signal to the video line.
video exists.

Due to these capacitances, the potential variation ΔVvideo of the video line occurs at the rising and falling edges of the output pulse from the buffer 33b. This ΔVvideo is ΔVvideo = VbxCgv / (Cgv + Cvideo), where Vb is the output voltage from the buffer 33b.
o).

FIG. 5 schematically shows the relationship between the output voltage Vb and the potential fluctuation ΔVvideo corresponding to the output voltage Vb. Normally, the buffer 33b may output an output pulse of about 18V as its output voltage Vb, and the potential fluctuation ΔV of about 20 mV is output to the video line.
Video is occurring. When the potential of the video line fluctuates in this manner, the fluctuating video signal is sampled at the timing T1 when the potential fluctuates, so that an accurate video signal cannot be written in the picture element, and especially when displaying a halftone. The display quality is degraded due to the potential fluctuation.

As a method of reducing noise on the video line, for example, Japanese Patent Laid-Open No. 6-11684 discloses a method of providing a shield wiring at a place where parasitic capacitance may occur. The method is not sufficient, and a process for forming shield wiring is required.

The present invention has been made to solve the above problems, and avoids or reduces potential fluctuations in a video line due to an output signal from a shift register or a buffer of a source drive circuit with a simple structure. An object of the present invention is to obtain a liquid crystal display device that can be manufactured.

[0014]

A liquid crystal display device according to the present invention (claim 1) includes at least a pixel and a pixel TFT.
And a TFT array in which the TFs are arranged in a matrix.
A liquid crystal display device integrated with a driver, which includes a source drive circuit having an analog switch for sampling an analog data signal, which is formed integrally with a T array. The liquid crystal display device is arranged in the vicinity of a shift register or a buffer which constitutes the source driving circuit, and a video line for transmitting a video signal as the analog data signal and an output of the shift register or the buffer to the analog switch. It has a wiring section up to the control input. Further, the wiring portion does not have a crossing portion between the wiring portion and the video line. Thereby, the above object is achieved.

According to a second aspect of the present invention, in the liquid crystal display device according to the first aspect, the video line is connected to the TF.
It is made of the same material as the source bus lines arranged in the T array.

According to a third aspect of the present invention, in the liquid crystal display device according to the first or second aspect, the wiring portion is made of an electrode material used as a gate electrode of the TFT constituting the analog switch and the pixel TFT. It was done.

According to a fourth aspect of the present invention, in the liquid crystal display device according to any one of the first to third aspects, a wiring portion from a drain of the TFT constituting the analog switch to a source bus line is provided with the source bus. It is made of a metal material used in the process after the line is formed.

A liquid crystal display device according to the present invention (claim 5) is a TFT array in which at least picture elements and TFTs for picture elements are arranged in a matrix, and an analog data signal formed integrally with the TFT array. Is a driver-integrated liquid crystal display device including a source drive circuit having an analog switch for sampling. The liquid crystal display device is arranged in the vicinity of a shift register or a buffer which constitutes the source drive circuit, and a video line for transmitting a video signal as the analog data signal, and an analog switch control from the output of the shift register or the buffer. It has a wiring section up to the input. And
The video line is composed of a video line main body having a separating portion and a video line connecting portion electrically connecting the separating portion, and is configured so as to intersect the wiring portion at the separating portion. Thereby, the above object is achieved.

According to a sixth aspect of the present invention, in the liquid crystal display device according to the fifth aspect, a source bus line for supplying a video signal to each picture element is provided in the TFT array, and the video line main body is provided with the source bus line. It is made of the same material as the source bus line, and the video line connecting portion is made of a conductive material used in the steps after the step of forming the source bus line.

According to a seventh aspect of the present invention, in the liquid crystal display device according to the fifth or sixth aspect, the wiring section from the shift register or buffer output to the control input of the analog switch is a TFT which constitutes the analog switch.
And an electrode material used as the gate electrode of the pixel TFT.

A liquid crystal display device according to the present invention (claim 8) is a TFT array in which at least picture elements and TFTs for picture elements are arranged in a matrix, and an analog data signal formed integrally with the TFT array. Is a driver-integrated liquid crystal display device including a source drive circuit having an analog switch for sampling. The liquid crystal display device is arranged in the vicinity of a shift register or a buffer forming the source drive circuit, and includes a video line for transmitting a video signal as the analog data signal and a shift register or a buffer forming the source drive circuit. The wiring from the output to the control input of the analog switch is provided. The video line has a narrower wiring width at the intersection between the video line and the wiring than in other portions. Thereby, the above object is achieved.

According to the present invention (claim 9), in the liquid crystal display device according to claim 8, a source bus line for supplying a video signal to each picture element is provided in the TFT array, and the video line is connected to the source line. It is made of the same material as the bus line.

According to the present invention (claim 10), in the liquid crystal display device according to claim 8 or 9, the wiring portion from the output of the shift register or the buffer to the control input of the analog switch is a transistor forming the analog switch. And an electrode material used as the gate electrode of the pixel TFT.

The operation will be described below.

According to the present invention (claim 1), the wiring portion from the output of the shift register or the buffer constituting the source driving circuit to the control input of the analog switch does not have an intersection with the video line. Because I did
It is possible to prevent the potential change in the video line due to the output signal from the shift register or the buffer of the source drive circuit from occurring, and it is possible to prevent the display quality from deteriorating due to the potential change. Further, the wiring portion can be configured to have no intersection with the video line by a simple specification change such as a layout change of the analog switch and the video line.

Further, since the TFT array and the source drive circuit are integrally formed, the liquid crystal display device can be downsized, and by forming many parts of the TFT array and the source drive circuit together. , The process can be simplified.

In the present invention (claim 2), in the liquid crystal display device, the video line is connected to the TFT.
Since the source bus line arranged in the array is made of the same material, the video line and the source bus line can be simultaneously formed by patterning the same conductive film, and the manufacturing process can be simplified. .

In the present invention (Claim 3), the wiring portion is formed of an electrode material used as a gate electrode of the TFT and the pixel TFT forming the analog switch. It can be formed by the step of forming the gate electrode of each TFT without increasing the number of pixels.

In the present invention (claim 4), the wiring portion from the drain of the transistor forming the analog switch to the source bus line is made of a metal material used in the process after the formation of the source bus line. Therefore, the wiring portion can be formed in another wiring forming step after the step of forming the source bus line.

According to the present invention (claim 5), the video line comprises a video line main body having a separating portion, and a video line connecting portion electrically connecting the separating portion,
Since the wiring portion from the output of the shift register or the buffer to the control input of the analog switch is configured to intersect at the separation portion, at the intersection portion of the wiring portion and the video line, the insulating film interposed therebetween is formed. The layer thickness can be increased. As a result, the capacitance at the intersection can be reduced, the potential fluctuation of the video line can be suppressed, and the deterioration of display quality can be suppressed. Further, since the TFT array and the source drive circuit are integrally configured, the liquid crystal display device can be downsized and the process can be simplified as in the case of the first aspect of the invention.

In the present invention (claim 6), the video line main body is made of the same material as the source bus line, and the video line connecting portion is made of a conductive material used in the steps after the step of forming the source bus line. Therefore, the video line main body can be formed in the source bus line forming step, and the video line connecting portion can be formed in another wiring forming step after the source bus line forming step.

In the present invention (claim 7), the wiring portion from the output of the shift register or the buffer to the control input of the analog switch is made of an electrode material used as the gate electrode of the TFT and the pixel TFT which constitute the analog switch. Since it is configured, the wiring portion can be formed by the step of forming the gate electrode of each TFT without increasing the number of steps.

In the present invention (claim 8), the wiring width of the video line at the intersection with the wiring from the output of the shift register or buffer of the source drive circuit to the control input of the analog switch is larger than that of the other portions. Has a narrow structure, the area of the portion of the video line facing the wiring is reduced. As a result, the capacitance at the intersection can be reduced, the potential fluctuation of the video line can be suppressed, and the deterioration of display quality can be suppressed. Further, since the TFT array and the source drive circuit are integrally configured, the liquid crystal display device can be downsized and the process can be simplified as in the case of the first aspect of the invention.

In the present invention (claim 9), since the video line and the source bus line are made of the same material, the video line and the source bus line can be simultaneously formed by patterning the same conductive film, and the manufacturing The process can be simplified.

In the present invention (claim 10), the wiring portion from the output of the shift register or the buffer to the control input of the analog switch is made of an electrode material used as a gate electrode of the TFT and the pixel TFT constituting the analog switch. Since it is configured, the wiring portion can be formed by the step of forming the gate electrode of each TFT without increasing the number of steps.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 1 is a schematic diagram for explaining the structure of a liquid crystal display device according to Embodiment 1 of the present invention. In the figure, the same reference numerals as those in FIG. Shows. Reference numeral 100 denotes the liquid crystal display device according to the first embodiment. In the source drive circuit 133 which constitutes the liquid crystal display device 100, the shift register 33a and the buffer 33b are provided.
Placement area and each video line 212, 214, 216
Of the analog switch array 1 between
39 are arranged. That is, in the first embodiment, as shown in FIG. 1, the output wiring 203 from the buffer 33b is
Is connected to the gate 43a of the TFT constituting the analog switch 211 without crossing the video lines 212, 214, 216.
The wiring 209 from the drain of the TFT to the source bus line 2 intersects the video lines 212, 214, 216.

FIG. 2A is a diagram showing the layout of the output wiring of the buffer, the analog switch, and the video line in the source driver section (source driving circuit) of FIG. 1, and FIG. ) Shows a cross-sectional structure of a line g-g in FIG. In the figure, FIG. 4 (a), (b)
The same reference numerals as in FIG.
The source and drain electrodes of the analog switch 211 are connected via electrodes 48 and 49 to wirings 44a and 44b made of the same material as the gate electrode 43a.

The output wiring 203 from the buffer 33b of the source driver 133 is connected to the video lines 212, 214,
It is connected to the control input of the analog switch 211, that is, the gate 43a of the TFT that constitutes the analog switch without crossing 216, and is formed of the gate electrode material of the TFT.

Also, the video lines 212 and 21 supplying the video signal to the source of the analog switch 211.
4, 216 are made of the same material as the source bus line 2 in the TFT array section 24. Usually, a low resistance Al is used as a constituent material of the video line in order to prevent the delay.

Since the video line is made of the same material as the source bus line, the wiring 209 from the drain of the analog switch to the source bus line, which is formed so as to straddle the video line when viewed from the top surface of the substrate, is a gate electrode. It is made of the same material as. One end of the wiring 209 is connected to the wiring 44b, and the other end is connected to the source bus line via a contact hole near the display portion. Further, one end of the wiring 204 from the source of the analog switch to the video line is connected to the wiring 44a, and the other end is connected to the contact hole 20.
1 to the corresponding video line.

Here, the wirings 204 and 209 can also be formed of a metal (for example, TiW) used in the steps after forming the source bus line.

The video signal sampled by the analog switch 211 passes over the video line and is supplied to the source bus line 2 of the TFT array 24 of the display section by the wiring 209, and then written in the picture element.

Here, the output voltage from the buffer 33b is about 18V, and if the layout is such that the output wiring of the buffer 33b intersects with the video line, the video line will be noisy for the reason described above, and this will cause a noise. As a result, the display quality will drop.

Instead, the wiring 20 from the drain electrode of the analog switch to the source bus line is used as described above.
9 and the video line are crossed, a capacitance Cdv is provided at the intersection 218 between the output line from the analog switch drain and the video line, and the line from the analog switch source is connected to the video line. A capacitance Csv (= Cdv) is generated between the two lines, but the voltage of the video line is (center voltage) ± 4 V, and the potential fluctuation is smaller than the output voltage from the buffer, so that the video line is almost noisy. Absent. Therefore, on the display,
An accurate video signal can be supplied.

Therefore, a liquid crystal display device of high display quality can be realized by simply changing the layout without increasing the manufacturing process.

In the first embodiment, the case where the output of the shift register is supplied to the control input of the analog switch via the buffer has been described. However, in some cases, the output of the shift register (the voltage is about 18V). is there.)
May be directly supplied to the analog switch, and in this case, the same effect as that of the first embodiment can be obtained.

(Second Embodiment) FIG. 6A is a diagram showing a layout of analog switches and video lines in a liquid crystal display device according to a second embodiment of the present invention. In this case, the equivalent circuit of the liquid crystal display device and the arrangement of each circuit portion thereof on the substrate are the same as those of the conventional one shown in FIG. Further, FIG. 6B shows h− in FIG.
6 shows a cross-sectional structure of the h-line portion, and in FIG. 6, the same reference numerals as those in FIG. 4 denote the same parts as in the conventional liquid crystal display device.

In the second embodiment, the video line 5
2, 54, and 56 each include a video line main body 91 having a separating portion 91a and a connecting portion 93 that electrically connects the separating portion 91a, and an output wiring 43 from the buffer 33b in the video line separating portion. Video line 5
2, 54 and 56 are made to intersect. here,
The output wiring 43 is made of a gate electrode material.

In this embodiment, the video line body 9
1 is formed of the same metal material as the video line in the conventional liquid crystal display device, that is, the metal material forming the source bus line. Also, the video line body 91
Is the second interlayer insulating film 50 deposited thereon.
The separating portion 91a of the main body 91 is electrically connected by the video line connecting portion 93 through the contact hole 50a formed in the second interlayer insulating film 50. The video line connecting portion 93 is composed of a metal film formed after the deposition of the second interlayer insulating film 50. FIG. 7 shows a cross-sectional structure of the pixel TFT in the TFT array section of the liquid crystal display device of the second embodiment. In the process of forming the pixel TFT, the source / drain electrodes 48 and 49 are formed, and then the second interlayer insulating film 50 is formed.
TFTs that make up analog switches until
In the case of a pixel TFT, a contact hole 80 is further formed in the second interlayer insulating film, and then a pixel electrode 82 is formed using a transparent conductive film such as ITO. There is. Further, in order to establish ohmic contact between the drain electrode 49 and the pixel electrode 82, a metal 81 such as TiW is usually interposed between them.

Therefore, the video line connection portion 93 can be formed of the same material as the metal 81 or the picture element electrode 82. However, since the metal 81 has a lower resistance than the picture element electrode 82, the metal 81 makes the video line connection. It is preferable to form the connecting portion 93.

In this embodiment, two lines are provided between the output wiring 43 from the buffer 33b and the video line connecting portion 93.
Since the two interlayer insulating films 46 and 50 are provided, even if the two interlayer insulating films have the same film thickness, the capacitance formed between the output wiring 43 from the buffer 33b and the video line at the intersection 58. Is 1 / compared to the conventional configuration
It is reduced to 2. As a result, it is possible to suppress the deterioration of display quality due to the potential fluctuation of the video line.

In the second embodiment, each of the video lines 52, 54 and 56 is composed of a video line main body having a separating portion 91a and a connecting portion 93 for electrically connecting the separating portion 91a. Since the output wiring from the buffer and the video line intersect at the separation part, there is no increase in the manufacturing process, no change in the layout of the analog switch or video line, and only the change in the cross-sectional structure of the video line. A high-quality liquid crystal display device can be realized.

(Third Embodiment) FIG. 8 shows a layout of analog switches and video lines according to a third embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4A indicate the same parts as those of the conventional liquid crystal display device. 52
Reference numerals a, 54a and 56a are video lines in the third embodiment, which are made of the same material as the source bus lines. Further, here, the output wiring 4 from the buffer 33b is used.
In order to reduce the capacitance generated between 3 and these video lines, the width of the video line at these intersections 58 is set to 1/2 of the width of the portions other than the intersections. Also in this embodiment, the output wiring 43 is made of a gate electrode material.

Since the above-mentioned video line is usually formed by using Al or the like having a low resistance, there is no problem of resistance even if the width of the intersection 58 becomes half of that of the other portion as described above.

In this way, the video line is transferred to the buffer 33.
By thinning the intersection from b to the output wiring 43, the capacitance of the intersection 58 can be reduced, and the influence of the pulse output to the output wiring 43 on the video line can be reduced. it can.

Further, if the width of the output wiring 43 is reduced at the intersection 58, the capacitance formed at the intersection of the output wiring 43 and the video line can be further reduced.

In the third embodiment, there is no increase in manufacturing process, no change in the layout of analog switches or video lines, and a liquid crystal display device of high display quality by selectively narrowing the wiring width of video lines. realizable.

In the second and third embodiments, the output of the shift register is supplied to the control input of the analog switch via the buffer.
The output of the shift register (the voltage is about 18 V) may be directly supplied to the analog switch, and in this case, the same effect as that of the above-described embodiment can be obtained.

Further, in each of the above-described embodiments of the present invention, the T of one channel (NMOS or PMOS) is used.
Although an analog switch composed of FT is shown, the present invention can be applied to an analog switch having a CMOS structure.

[0060]

As described above, according to the present invention, the wiring portion from the output of the shift register or buffer constituting the source drive circuit to the control input of the analog switch is
Since there is no intersection with the video line, the potential of the video line does not fluctuate due to the output of a high voltage from the shift register or the buffer of the source driver circuit. It is possible to prevent the display quality from deteriorating due to fluctuations.

According to the present invention, the wiring portion from the output of the shift register or the buffer in the source drive circuit to the control input of the analog switch is made of the electrode material used as the gate electrode of the TFT and the pixel TFT which constitute the analog switch. Since it is configured, the wiring portion can be formed by the step of forming the gate electrode of each TFT without increasing the number of steps.

According to the present invention, the video line is composed of the video line main body having the separating portion and the video line connecting portion electrically connecting the separating portion, and the output wiring from the buffer is provided in the video line separating portion. And the video line intersect with each other, the increase in the layer thickness of the insulating film between the wiring portion and the video line causes the wiring portion and the video line formed at the intersection to intersect with each other. It is possible to reduce the capacitance between them, thereby suppressing the potential fluctuation of the video line and suppressing the deterioration of display quality. Moreover, in this case, there is no need to increase the manufacturing process and change the layout of analog switches and video lines.

According to the present invention, the video line has a structure in which the wiring width is narrower at the intersection with the wiring from the output of the shift register or buffer of the source drive circuit to the control input of the analog switch than at other portions. Therefore, the area of the portion of the video line facing the wiring is reduced. As a result, it is possible to reduce the capacitance at the intersection and suppress the potential fluctuation of the video line, and as a result, it is possible to suppress the deterioration of display quality.

As described above, the liquid crystal display device according to the present invention is
In particular, there is an effect that the display quality of a liquid crystal display device that performs halftone display can be improved.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a schematic configuration of a liquid crystal display device according to a first embodiment of the present invention, showing an equivalent circuit for a TFT array section, an analog switch, and a video line.

FIG. 2A is a diagram showing a layout of analog switches and video lines in the liquid crystal display device of the above-described Embodiment 1, and FIG. 2B is a view taken along line gg of FIG. 2A. It is a figure which shows a cross-section.

FIG. 3 is a diagram for explaining a schematic configuration of a conventional liquid crystal display device, showing an equivalent circuit for a TFT array section, an analog switch, and a video line.

4 (a) is a diagram showing a layout of analog switches and video lines in a conventional liquid crystal display device, and FIG. 4 (b) is a sectional structure of a line ff of FIG. 4 (a). FIG.

FIG. 5 is a diagram showing schematic waveforms of an output pulse from a shift register of a conventional liquid crystal display device and a video signal affected by the output pulse.

6A is a diagram showing a layout of analog switches and video lines in the liquid crystal display device according to the second embodiment of the present invention, and FIG. 6B is a line hh of FIG. 6A. It is a figure which shows the cross-section of a part.

FIG. 7 is a diagram showing a cross-sectional structure of a picture element portion TFT in the liquid crystal display device of the second embodiment.

FIG. 8 is a view showing a layout of analog switches and video lines in a liquid crystal display device according to Embodiment 3 of the present invention.

[Explanation of symbols]

1 gate bus line 2 source bus line 3 additional capacitance common wiring 24 TFT array 31 insulating substrate 32 gate driver 32a, 33a shift register 32b, 33b buffer 33, 133 source driver 35 picture element TFT 36 picture element 37 additional capacity 38, 138 Video line placement unit 39,139 Analog switch array 39a, 211 Analog switch 43,203 Output wiring 52,54,56,212,214,216 Video line 91 Video line body 91a Separation unit 93 Video line connection unit 100 Liquid crystal display device

Claims (10)

[Claims] 1. A source drive having a TFT array in which at least picture elements and TFTs for picture elements are arranged in a matrix, and an analog switch formed integrally with the TFT array for sampling an analog data signal. A liquid crystal display device integrated with a driver including a circuit, the video line being arranged near a shift register or a buffer which constitutes the source driving circuit and transmitting a video signal as the analog data signal; Alternatively, a liquid crystal display device comprising a wiring section from the output of the buffer to the control input of the analog switch, the wiring section having no intersection with the video line. 2. A source bus line for supplying a video signal to each picture element is provided in the TFT array,
The liquid crystal display device according to claim 1, wherein the video line is made of the same material as the source bus line. 3. The liquid crystal display device according to claim 1, wherein the wiring portion is made of an electrode material used as a gate electrode of the TFT and the pixel TFT that form the analog switch. 4. A source bus line for supplying a video signal to each picture element is provided in the TFT array, and a wiring portion from the drain of the TFT constituting the analog switch to the source bus line is The liquid crystal display device according to claim 1, wherein the liquid crystal display device is made of a metal material used in a process after the formation of the source bus line. 5. A source drive having a TFT array in which at least picture elements and TFTs for picture elements are arranged in a matrix and an analog switch formed integrally with the TFT array for sampling analog data signals. A liquid crystal display device integrated with a driver including a circuit, the video line being arranged near a shift register or a buffer which constitutes the source driving circuit and transmitting a video signal as the analog data signal; Alternatively, a wiring section from the output of the buffer to the control input of the analog switch is provided, and the video line is composed of a video line main body having a separation section and a video line connection section electrically connecting the separation section. A liquid crystal display device configured to intersect the wiring portion at the separation portion. 6. A source bus line for supplying a video signal to each pixel is provided in the TFT array, and the video line body is made of the same material as the source bus line, and The liquid crystal display device according to claim 5, wherein the video line connection portion is made of a conductive material used in a step subsequent to the step of forming the source bus line. 7. The wiring section from the output of the shift register or the buffer to the control input of the analog switch includes a TFT and a TF for picture elements which constitute the analog switch.
7. The liquid crystal display device according to claim 5, which is made of an electrode material used as a T gate electrode. 8. A source drive having a TFT array in which at least picture elements and TFTs for picture elements are arranged in a matrix and an analog switch formed integrally with the TFT array for sampling an analog data signal. A driver integrated liquid crystal display device comprising a circuit, a video line for transmitting a video signal as the analog data signal, which is arranged in the vicinity of a shift register or a buffer constituting the source drive circuit, and the source drive circuit. The wiring from the output of the shift register or the buffer that constitutes the circuit to the control input of the analog switch is provided, and the wiring width of the video line is narrower at the intersections of the video line and other portions than at other portions. Liquid crystal display device. 9. The source bus line for supplying a video signal to each pixel is provided in the TFT array, and the video line is formed of the same material as the source bus line. The described liquid crystal display device. 10. The wiring section from the output of the shift register or the buffer to the control input of the analog switch includes a TFT and a TF for picture elements which constitute the analog switch.
The liquid crystal display device according to claim 8 or 9, which is made of an electrode material used as a gate electrode of T.