JP2607626B2 - Manufacturing method of liquid crystal display device - Google Patents

Description

The present invention relates to a method for manufacturing a liquid crystal display device, and more particularly, to a liquid crystal in which a spacer holding step for uniformly holding a gap in a cell is improved. The present invention relates to a method for manufacturing a display device.

2. Description of the Related Art Conventionally, a liquid crystal display device is manufactured by placing an electrode substrate in which thin film transistors and display pixel portions are arranged in an array on a transparent insulating substrate, and a color filter substrate in which a color filter and a common electrode are stacked. In order to keep the gap in the cell constant, a spherical or cylindrical spacer having a uniform diameter in the range of 3 to 10 μm is sprayed on the color filter substrate, and the electrode substrate is stacked thereon, and a sealing agent is interposed therebetween. Lamination,
Thereafter, a method is employed in which liquid crystal is injected between the substrates through a notch in a seal portion made of a sealing agent to seal the notch.

In the above-described conventional method, the spacers are scattered over the entire color filter substrate. Therefore, the spacers are also arranged on the display pixel portion of the electrode substrate facing the color filter substrate.
When the spacers are arranged in the display pixel portion in which the liquid crystal is accommodated as described above, the quality of image quality is reduced, and when the amount of the spacers is increased, a problem that display failure occurs occurs.

(Problems to be Solved by the Invention) The present invention has been made in order to solve the above-mentioned conventional problems, and a spacer is provided at a specific place without being arranged at a display pixel portion in which liquid crystal is accommodated. An object of the present invention is to provide a method for manufacturing a liquid crystal display device that can be arranged.

[Constitution of the Invention] (Means for Solving the Problems) According to the present invention, a spacer is sprayed on an alignment film of a color filter substrate in which a surface including a protrusion is coated with at least a plastic protective film and an alignment film. A step of pressing the spacer through a flat plate to bury a part of the spacer in the alignment film and the protective film on the protrusion, and a step of removing the spacer on the alignment film region other than the protrusion. Disposing an electrode substrate having a display pixel portion and an alignment film coated on a surface including a signal line protruding from the pixel portion via a spacer on the color filter substrate, and superimposing the electrode substrate. This is a method for manufacturing a liquid crystal display device.

The present invention also provides a step of spraying a spacer on the alignment film of an electrode substrate in which a plastic protective film and an alignment film are coated on a surface including a display pixel portion and a signal line protruding from the pixel portion; A step of embedding a part of the spacer in the alignment film and the protective film on the protruding signal line by pressing the spacer through, a step of removing the spacer on the alignment film region other than the signal line, and a color filter substrate Is disposed on the electrode substrate with a spacer interposed therebetween, and is overlapped with each other.

(Function) According to the present invention, spacers are scattered on the alignment film of the color filter substrate in which the surface including the protrusions is coated with at least a plastic protective film and an alignment film, and the spacers are pressed via a flat plate. After burying a part of the spacer in the alignment film and the protective film on the protrusion, and further removing the spacer on the alignment film region other than the protrusion, the display pixel portion and the signal line protruding from the pixel portion are removed. By arranging and overlapping an electrode substrate having a surface including an alignment film on the color filter substrate with a spacer interposed therebetween, it is possible to prevent the spacer from being arranged in the display pixel portion of the electrode substrate. As a result, it is possible to manufacture a high-performance liquid crystal display device in which the deterioration of image quality and display defects are eliminated by disposing the spacer in the display pixel portion in which the liquid crystal is accommodated.

In addition, spacers are scattered on the alignment film of the electrode substrate in which a plastic protective film and an alignment film are coated on the surface including the display pixel portion and the signal line protruding from the pixel portion, and the spacer is removed by a similar process. By disposing a color filter substrate on the electrode substrate via a spacer and overlapping the color filter substrate, the spacer can be prevented from being disposed in the display pixel portion of the electrode substrate, and the spacer is disposed in the display pixel portion in which liquid crystal is accommodated. It is possible to manufacture a liquid crystal display device capable of high-reliability and high-quality display that eliminates deterioration in image quality and display defects due to the arrangement.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Example 1 First, a black matrix 2 and red (R), green (G), and blue (B) color filters 3 as projections are provided on the surface of a glass substrate 1, and the black matrix 2 and the color filters 3 are included. A color filter substrate 7 was fabricated by sequentially covering the surface with a protective film 4 made of, for example, a 3 μm-thick acrylic resin, a transparent common electrode 5 made of ITO, and an alignment film 6. Subsequently, a glass spacer 8 having a particle size of about 5.5 μm was sprayed on the alignment film 6 of the color filter substrate 7 (see FIG. 1A).

Next, a glass flat plate 9 having a high flatness was placed on the side of the color filter substrate 7 where the spacer 8 was sprayed, and then a uniform pressure was applied to the color filter substrate 7 from the flat plate 9. As a result, as shown in FIG. 2B, a part of the spacer 8 located on the black matrix 2
It was embedded in the transparent common electrode 5 and the protective film 7. Then,
By performing air blowing from an oblique direction, as shown in FIG. 3C, the spacers 8 that are scattered on the alignment film 6 excluding the black matrix 2 and are not embedded in the alignment film 6 and the like are selectively removed. did.

Next, a display pixel portion 11 and a signal line 12 protruding from the pixel portion are provided on the surface of the glass substrate 10, and a surface including the pixel portion 11 and the signal line 12 is further covered with an alignment film 13 to form an electrode substrate 14.
Was prepared. Subsequently, the electrode substrate 14 is placed on the color filter substrate 7 on which the spacers 8 are disposed so that the signal lines 12 of the electrode substrate 14 coincide with the spacers 8 on the black matrix 2 of the color filter substrate 7, They were pasted together via a sealing agent (not shown) (illustration (d) in the figure). Thereafter, a liquid crystal was injected between the substrates through a notch of a seal portion made of a sealant, and the notch was sealed to produce a liquid crystal display device.

According to the first embodiment, after removing the spacers 8 on the region of the alignment film 6 other than the black matrix 2 which is the projection of the color filter substrate 7 in the step shown in FIG. Since the electrode substrate 14 is arranged on the substrate 7 with the spacer 8 interposed therebetween and overlapped with each other, it is possible to prevent the spacer 8 from being arranged in the display pixel portion 11 of the electrode substrate 14. As a result, it is possible to manufacture a liquid crystal display device capable of high-reliability and high-quality display with reduced image quality and display defects due to the arrangement of the spacers in the display pixel portion in which the liquid crystal is accommodated.

Example 2 First, a display pixel portion 11 and a signal line 12 protruding from the pixel portion are provided on the surface of a glass substrate 10, and a surface including the pixel portion 11 and the signal line 12 is made of, for example, a 3 μm-thick acrylic resin. Electrode substrate 14 ′ covering protective film 15 and alignment film 13
Was prepared. Subsequently, a glass spacer 8 having a particle size of about 5.5 μm was sprayed on the alignment film 13 of the electrode substrate 14 '(shown in FIG. 2 (a)).

Then, the spacer 8 is formed in the same manner as in the first embodiment.
Flat glass plate (not shown) with high flatness on the spraying side
Is applied, a part of the spacer 8 located on the signal line 12 is buried in the alignment film 13 and the protective film 15 by applying a uniform pressure, and then the air is blown, so that the alignment film excluding the signal line 12 is removed.
The spacers 8 on 13 were selectively removed. Subsequently, a black matrix 2 and a red (R), green (G), and blue (B) color filter 3 as projections are provided on the surface of the glass substrate 1, and the surface including the black matrix 2 and the color filter 3 is provided on the surface including the black matrix 2 and the color filter 3. A protective film 4 made of an acrylic resin, a transparent common electrode 5 made of ITO, and an alignment film 6 are sequentially coated to form a color filter substrate 7, and this color filter substrate 7 is attached to an electrode substrate 14 'on which the spacers 8 are arranged. The black matrix 2 of the color filter substrate 7 is arranged so as to coincide with the spacer 8 on the signal line 12 of the electrode substrate 14 ', and is superimposed and bonded via a sealing agent (not shown) (illustrated in FIG. 2B). . Thereafter, a liquid crystal was injected between the substrates through a notch of a seal portion made of a sealant, and the notch was sealed to produce a liquid crystal display device.

In the second embodiment, as in the first embodiment, the spacer 8 can be prevented from being disposed in the display pixel section 11 of the electrode substrate 14 '. As a result, it is possible to manufacture a liquid crystal display device capable of performing high-reliability and high-quality display while eliminating degradation in image quality and display defects due to this.

In the above embodiment, a spacer made of glass is used as the spacer. However, a spacer made of alumina may be used, and a cylindrical spacer may be used instead of the spherical spacer.

In the above embodiment, the spacer is selectively removed by air blowing, but may be removed by electrostatic blowing.

In the above embodiment, the protective film is formed of an acrylic resin, but may be formed of a urethane resin.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to prevent the spacer from being arranged in the display pixel portion of the electrode substrate, and to dispose the spacer in the display image portion where the liquid crystal is accommodated. It is possible to provide a method for manufacturing a liquid crystal display device capable of high-reliability and high-quality display by eliminating degradation in image quality and display defects.

[Brief description of the drawings]

1 (a) to 1 (d) are cross-sectional views showing a manufacturing process of a liquid crystal display device according to Embodiment 1 of the present invention.
(B) is a sectional view showing a manufacturing process of the liquid crystal display device in Example 2 of the present invention. 1, 10 ... glass substrate, 2 ... black matrix,
3 ... Color filter, 4, 15 ... Protective film, 6, 13 ...
Alignment film 7 Color filter substrate 8 Spacer
9: glass plate, 11: display pixel part, 12: signal line,
14, 14 ': Electrode substrate.

Claims (2)

(57) [Claims] A step of spraying spacers on the alignment film of a color filter substrate having a surface including projections covered with at least a plastic protective film and an alignment film; and pressing the spacers via a flat plate. A step of embedding a part of the spacer in the alignment film and the protective film on the protrusion, a step of removing the spacer on the alignment film region other than the protrusion, a display pixel portion and a signal line protruding from the pixel portion And disposing an electrode substrate having a surface coated with an alignment film on the color filter substrate with a spacer interposed therebetween, and superimposing the electrode substrate on the color filter substrate. 2. A step of spraying spacers on an alignment film of an electrode substrate in which a plastic protective film and an alignment film are coated on a surface including a display pixel portion and a signal line protruding from the pixel portion; A step of embedding a part of the spacer in the alignment film and the protective film on the protruding signal line by pressing the spacer through, a step of removing the spacer on the alignment film region other than the signal line, and a color filter substrate Is disposed on the electrode substrate with a spacer interposed therebetween, and is overlapped with each other.