JP2001249345A - Liquid crystal display device and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device manufacturing at a low cost, in a simple process and with a high yield and its manufacturing method. SOLUTION: In a liquid crystal display device 1 comprising a glass substrate 19, with a common electrode 20 formed, so as to be placed opposite to the seal pattern 9 side of a substrate 2 which is provided with a picture display part 8, the sealing pattern 9 applied thereto surrounding the picture display part 8 and common electrode wiring 10a, 10b formed outside the sealing pattern 9, and a liquid crystal 23 injected into a gap produced in sticking the substrates 2, 19 to each other via the seal pattern 9, the sealing pattern 9 is conductive, is applied being overlapped with each one tip respectively of the common electrode wiring 10a, 10b and sticks and substrate 2 and the glass substrate 19 together. Also the common electrode 20 and the common electrode wiring 10a, 10b are connected electrically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device used for displaying images and a method of manufacturing the same.

[0002]

2. Description of the Related Art A conventional liquid crystal display device 24 will be described with reference to FIG. FIG. 2 shows a conventional liquid crystal display device,
(A) is a plan view cutaway view from the top of the glass substrate,
(B) is an MM sectional view of (A), and (C) is an NN sectional view of (A). Actually, this conventional liquid crystal display device has an image display section in which a large number of pixels are formed in a matrix on a substrate, but here, in order to simplify the description,
This image display section has a configuration in which four pixels are arranged in a matrix.

As shown in FIGS. 2A, 2B and 2C, a liquid crystal display device 24 includes an insulating layer 3 made of SiO ₂ formed on a silicon substrate 2 and an insulating layer 3 formed on the insulating layer 3. An image display unit 8 including four pixels 4, 5, 6, and 7 arranged in a matrix; a seal pattern 25 that is applied so as to surround the image display unit 8 and has a liquid crystal injection port 25a; Outside the seal pattern 25, common electrode wirings 10a and 10b are drawn out from the seal pattern 25 side. These pixels 4, 5,
6, 7 are MOS transistors 14 having a source 11, a gate 12 made of polycrystalline silicon, and a drain 13.
And a storage capacitor 17 composed of a polycrystalline silicon 16 formed on the insulating layer 3, the insulating layer 3, and an electrode 15 of the drain 13 extending in the lateral direction of the MOS transistor 14. Note that the polycrystalline silicon 16 is connected to the electrode 15 of the drain 13.

A first alignment film 18 is formed on the image display section 8 and the insulating layer 3. On the other hand, a transparent common electrode 20 and a second alignment film 21 are sequentially formed on a glass substrate 19. Pastes 26, 26 containing Ag as a main component are applied to one end of the common electrode wirings 10a, 10b on the seal pattern 25 side. Further, the glass substrate 19
Of the silicon substrate 2 on the side of the second alignment film 21
The liquid crystal 22 injected from the liquid crystal injection port 25 a exposed from the gap is sealed with a sealant 23. The common electrode wirings 10 a and 10 b and the common electrode 20 of the glass substrate 19 are electrically connected via a paste 26.

The liquid crystal molecules of the liquid crystal 22 are formed on the first alignment film 18 and the glass substrate 19 formed on the silicon substrate 2.
In the initial state (state in which no voltage is applied), these substrates 2, 1
9 has a slight inclination in one direction from the vertical or horizontal direction. The material of the liquid crystal 22 is, for example, a nematic liquid crystal. T is a lead terminal of the active matrix drive circuit.

Next, a method of manufacturing the liquid crystal display device 24 will be described. Silicon substrate 2 on which image display unit 8, first alignment film 18, and common electrode wirings 10a and 10b are formed in advance
Prepare On the other hand, a glass substrate 19 on which the second alignment film 21 and the common electrode 20 are formed is prepared. A seal pattern 25 having a liquid crystal injection port 25a on the silicon substrate 2.
Is applied so as to surround the image display section 8. next,
Pastes 26, 26 are applied to one end of the common electrode wirings 10a, 10b on the seal pattern 25 side.

Next, the second alignment film 21 side of the glass substrate 19 is arranged to face the first alignment film 18 of the silicon substrate 2, and the silicon substrate 2 and the glass substrate 19 are bonded via a seal pattern 25. At this time, the common electrode wirings 10a, 10b and the common electrode 20 are electrically connected via the pastes 26, 26. Next, after injecting the liquid crystal 22 from the liquid crystal injection port 25a, the liquid crystal is sealed with a sealant 23 to obtain the liquid crystal display device 24 shown in FIG.

Next, the operation of the conventional liquid crystal display device 24 will be described. In the state where the scanning signal is sequentially supplied to the gate 12 of the MOS transistor 14 in each of the pixels 4, 5, 6, and 7 to turn on, the image signal is sequentially supplied to the source 11 and the storage capacitor is connected via the drain 13. In the state where the data is written on the readout 17, readout light is irradiated from the glass substrate 19 side, passes through the liquid crystal 22, is reflected by the electrodes of the source 11 and the drain 13, passes through the liquid crystal 22 again, and is modulated. Out of the glass substrate 19. The reflected light subjected to the light modulation is displayed as an image via a polarization converter such as a polarization beam splitter or a polarizing plate.

[0009]

However, since the common electrode wirings 10a and 10b are formed outside the seal pattern 9, the area of the silicon substrate 2 is increased by the area where the pastes 26 and 26 are applied. Needed. For this reason, the silicon substrate 2 having a large area is required, and the material cost is high. In addition, if the area of the silicon substrate 2 is large, the ratio of crystal defects in the silicon substrate 2 included in the image display section 8 increases, which causes a decrease in yield.

Further, in the conventional manufacturing method of the liquid crystal display device 24, a step of applying a seal pattern 25 for bonding the silicon substrate 2 and the glass substrate 19 is performed, and the common electrode wirings 10a and 10b of the silicon substrate 2 are further formed. Paste 2 for electrical connection between the substrate and the common electrode 20 of the glass substrate 19.
6 requires a large number of man-hours. Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device which can be manufactured at a low cost and with a simple process with a high yield, and a method for manufacturing the same.

[0011]

According to the present invention, there is provided a liquid crystal display device comprising: a substrate having an image display section, a seal pattern applied around the image display section, and a common electrode wiring formed outside the seal pattern; A glass substrate formed so that the common electrode faces the seal pattern side of the substrate, and a liquid crystal injected into a gap generated when these substrates are bonded via the seal pattern. In the liquid crystal display device, the seal pattern is made of a conductive material, and is applied so as to overlap with one end of the common electrode wiring. The substrate and the glass substrate are bonded together, and the common electrode and the common electrode are bonded together. It is characterized by being electrically connected to the wiring. The method of manufacturing a liquid crystal display device according to the present invention includes a substrate having an image display portion, a seal pattern applied to surround the image display portion, and a common electrode wiring formed outside the seal pattern in advance. A glass substrate formed so that the common electrode faces the seal pattern side is prepared, and the substrate and the glass substrate are pasted together with a predetermined gap through the seal pattern. In the method of manufacturing a liquid crystal display device manufactured by injecting liquid crystal into the seal pattern,
It is made of a conductive material, applied so as to overlap one end of the common electrode wiring, and bonding the substrate and the glass substrate and electrically connecting the common electrode and the common electrode wiring. It is characterized by having done.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal display device according to an embodiment of the present invention and a method for manufacturing the same will be described with reference to FIG. FIG. 1 shows a liquid crystal display device according to an embodiment of the present invention,
(A) is a plan view cutaway view from the top of the glass substrate,
(B) is an AA sectional view of (A). The same components as those of the related art are denoted by the same reference numerals, and description thereof will be omitted. FIG.
As shown in (A) and (B), the liquid crystal display device 1 according to the embodiment of the present invention uses a conventional liquid crystal display device 24 instead of the conventional liquid crystal display device 24.
A conductive seal pattern 9 surrounds the image display section 8,
In addition, the silicon substrate 2 and the glass substrate 19 are bonded together while being applied so as to overlap with one ends of the common electrode wirings 10a and 10b, and the common electrode 20 and the common electrode wiring 10
a and 10b are electrically connected, and other configurations are the same.

The seal pattern 9 includes an epoxy resin and
0.05 parts to 100 parts of this epoxy resin
A glass fiber or silica ball having a diameter equal to the thickness of the desired liquid crystal 22 consisting of 0.3 parts;
(PMMA) balls having a diameter 5 to 20% larger than the thickness of the liquid crystal 22 composed of
mixing with conductive particles plated with a metal such as i and Au,
Stirred with a homogenizer etc. and vacuum degassed,
It has conductivity.

Next, a method for manufacturing the liquid crystal display device 1 of the present invention will be described. The image display unit 8 and the first alignment film 1
8 and a silicon substrate 2 having common electrode wirings 10a and 10b formed outside the image display section 8, and a glass substrate 19 on which a common electrode 20 and a second alignment film 21 are formed. Thereafter, a seal pattern 9 having a liquid crystal injection port 9a surrounding the image display section 8 of the silicon substrate 2 and overlapping one end of the common electrode wirings 10a and 10b is applied.

Further, when the second alignment film 21 side of the glass substrate 19 is arranged to face the seal pattern 9 of the silicon substrate 2 and the silicon substrate 2 and the glass substrate 19 are bonded to each other with a predetermined gap. The electrode wirings 10a and 10b and the common electrode 20 of the glass substrate 19 are electrically connected.
Thereafter, steps similar to those of the conventional method of manufacturing the liquid crystal display device 24 are performed to obtain the liquid crystal display device 1 according to the embodiment of the present invention shown in FIG. The operation of the liquid crystal display device 1 of the present invention is the same as that of the conventional liquid crystal display device 24, and the description thereof will be omitted.

As described above, according to the liquid crystal display device 1 of the embodiment of the present invention, the seal pattern 9 is made to have conductivity in addition to adhesiveness.
Surrounds the image display section 8 and has a common electrode wiring 10a,
The silicon substrate 2 and the glass substrate 19 are bonded together while being overlapped with one end of 10b, and the common electrode 20 is electrically connected to the common electrode wirings 10a and 10b. Can be reduced, so that the material cost can be reduced. Therefore, the ratio of crystal defects in the silicon substrate 2 included in the image display unit 8 is reduced, and the yield is improved.

Furthermore, according to the manufacturing method of the liquid crystal display device of the embodiment of the present invention, the image display section 8 is formed on the silicon substrate 2 so that the seal pattern 9 has not only adhesiveness but also conductivity. Surrounding and common electrode wiring 10
After the seal pattern 9 is formed so that one ends of the a and 10b overlap, the silicon substrate 2 and the glass substrate 19 are bonded together and the common electrode 20 and the common electrode wirings 10a and 10b are electrically connected. This significantly reduces the number of man-hours. In the embodiment of the present invention, the case of the MOS transistor has been described.
It is needless to say that the present invention is effective even when an amorphous silicon or polysilicon thin film transistor is used. In the embodiment of the present invention, the common electrode wirings 10a and 10b
Although the case of a book has been described, the present invention is not limited to this, and may be any number as long as it is one or more.

[0018]

According to the liquid crystal display device of the present invention, a substrate having an image display portion, a seal pattern applied to surround the image display portion, and a common electrode wiring formed outside the seal pattern is provided. A liquid crystal display comprising a glass substrate formed so that the common electrode faces the seal pattern side of the substrate, and a liquid crystal injected into a gap generated when these substrates are bonded via the seal pattern. In the apparatus, the seal pattern includes:
It is made of a conductive material, and is applied so as to overlap with one end of the common electrode wiring, so that the substrate and the glass substrate are bonded together and the common electrode and the common electrode wiring are electrically connected. Therefore, the area of the substrate can be reduced, and the material cost can be reduced. Further, since the area can be reduced in this manner, the ratio of crystal defects in the substrate included in the image display portion is reduced, and the yield is improved. According to the manufacturing method of the liquid crystal display device of the present invention, a substrate having an image display portion, a seal pattern applied to surround the image display portion in advance, and a common electrode wiring formed outside the seal pattern, Prepare a glass substrate formed so that the common electrode is arranged to face the seal pattern side of the substrate, via the seal pattern, the substrate and the glass substrate are bonded together with a predetermined gap, In the method of manufacturing a liquid crystal display device manufactured by injecting liquid crystal into the gap, the seal pattern is made of a conductive material, and is applied so as to overlap one end of the common electrode wiring, and the substrate and the glass Since the common electrode and the common electrode wiring are electrically connected to each other while being bonded to the substrate, the number of steps can be significantly reduced.

[Brief description of the drawings]

FIG. 1 shows a liquid crystal display device according to an embodiment of the present invention,
(A) is a plan view cutaway view from the top of the glass substrate,
(B) is an AA sectional view of (A).

2A and 2B show a conventional liquid crystal display device, in which FIG. 2A is a plan view cutaway view from the upper surface of a glass substrate, and FIG.
FIG. 3C is a cross-sectional view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 2 ... Silicon substrate (substrate), 3 ... Insulating layer, 4, 5, 6, 7 ... Pixel, 8 ... Image display part, 9 ... Seal pattern, 9a ... Liquid crystal injection port, 10a, 10b ... Common electrode wiring, 11 source, 12 gate, 13 drain, 14 MOS transistor, 15 electrode, 16
Polycrystalline silicon, 17: storage capacitor, 18: first alignment film,
19: glass substrate, 20: common electrode, 21: second alignment film, 22: liquid crystal, 23: sealant

Claims (2)

[Claims] A substrate having an image display portion, a seal pattern applied to surround the image display portion, and a common electrode wiring formed outside the seal pattern; and the common electrode on the seal pattern side of the substrate. In a liquid crystal display device including a glass substrate formed so as to face and a liquid crystal injected into a gap generated when these substrates are bonded to each other with the seal pattern interposed therebetween, the seal pattern has a conductive property. And is applied so as to overlap with one end of the common electrode wiring,
A liquid crystal display device, wherein the substrate and the glass substrate are bonded together and the common electrode and the common electrode wiring are electrically connected. 2. A substrate having an image display section, a seal pattern applied to surround the image display section in advance, and a common electrode wiring formed outside the seal pattern, and a common pattern formed on the seal pattern side of the substrate. Prepare a glass substrate formed so that electrodes are opposed to each other, paste the substrate and the glass substrate with a predetermined gap through the seal pattern, inject liquid crystal into this gap In the method for manufacturing a liquid crystal display device to be manufactured, the seal pattern is made of a conductive material, and is applied so as to overlap one end of the common electrode wiring,
A method for manufacturing a liquid crystal display device, comprising: bonding the substrate and the glass substrate; and electrically connecting the common electrode and the common electrode wiring.