JP3531995B2 - Manufacturing method of liquid crystal display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a liquid crystal display device in which liquid crystal is sealed between two glass substrates.

[0002]

2. Description of the Related Art Conventionally, as a liquid crystal display device of this type,
For example, an active type color liquid crystal display cell 1 shown in FIG. 3 is known.

The color liquid crystal display cell 1 shown in FIG.
A color filter substrate 3 similarly formed of a glass substrate is opposed to an active matrix array substrate 2 formed of a glass substrate, and a spacer (not shown) is interposed between the active matrix array substrate 2 and the color filter substrate 3. The liquid crystal-filled spaces 4 are inserted at predetermined intervals. Then, the periphery of the active matrix array substrate 2 and the color filter substrate 3 is sealed with a sealant 5 to seal the liquid crystal in the liquid crystal enclosed space 4.

Further, the active matrix array substrate 2
A transparent pixel electrode (not shown) and a thin film transistor portion that drives this pixel electrode are arranged in a matrix on the upper side, and are driven through the drain electrode by the gate electrode and the source electrode. Further, an external connection electrode 6 is formed on the active matrix array substrate 2, a gate electrode and a drain electrode are formed on the external connection electrode 6, and the external connection electrode 6 is provided with the external connection electrode 6 after the color liquid crystal display cell 1 is manufactured. A drive IC (not shown) is connected.

In the current active type color liquid crystal display cell 1, both the active matrix array substrate 2 and the color filter substrate 3 are made of a glass substrate having a thickness of 1.1 mm, for example. From the state, the color liquid crystal display cell 1 is formed through various pattern forming steps and cell assembling steps.

[0006]

However, in the case of the color liquid crystal display cell 1 shown in FIG. 3, since the glass substrate has a thickness of 1.1 mm, the total thickness exceeds 2.2 mm. As a result, the light transmittance also decreases and the weight becomes heavy.

When a display for personal information terminal equipment is constructed by using the color liquid crystal display cell 1, portability is negative in terms of weight and thickness, and light transmittance is low. Therefore, it is necessary to increase the brightness of the backlight, the backlight becomes large, and the power supply battery also becomes large.

Therefore, a thinner glass substrate having a thickness of 0.7 mm or 0.5 mm, which is thinner than the conventional thickness of 1.1 mm, or a glass substrate having a thickness of 0.3 mm is used as a material. Even that is suggested.

However, if the glass substrate is made thin,
The amount of warpage and bending increases, and the difficulty of material handling in each process increases.

Further, the easiness of deformation of the glass substrate with respect to temperature increases, and it becomes difficult to secure uniformity in each heat treatment step.

Further, in order to increase the productivity of the active matrix array substrate, it is desired to increase the size of the glass substrate as a raw material, but since the amount of warpage and bending increases, the glass substrate is easily deformed. However, enlarging the glass substrate has a difficult problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of manufacturing a liquid crystal display device which can be thinned without causing deformation such as warping or bending of a glass substrate. And

[0013]

SUMMARY OF THE INVENTION The present invention is directed to a given electrode pattern.
A liquid crystal filled space is created between the two glass substrates with the turn formed.
The liquid crystal is sealed in the space filled with the liquid crystal.
LCD display with external connection electrodes that are stopped and connect to the outside
Protecting the external connection electrode in a device manufacturing method
The process of forming a resist film and the process of forming this resist film
After the above process, glass etching treatment is applied to
The step of uniformly thinning the thickness of the glass substrate in step 2,
After making the glass substrate of the specified thickness into a predetermined thickness, the resist film is removed.
Process comprising the step of forming the resist film is removed by washing is to after the step of forming the liquid crystal display device.

Further, in the present invention, the glass etching treatment is to immerse the liquid crystal display device having the resist film in an etching solution.

[0015]

According to the present invention, the resist film for protecting the external connection electrode is formed, and after the step of forming the resist film, the glass etching treatment is performed to uniformly reduce the plate thickness of the two glass substrates. After the glass substrate of a predetermined thickness, after removing the resist film, because it can be thinned without thinning the glass substrate as a material, warping the glass substrate, without causing deformation such as bending, It can be made thinner.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing a liquid crystal display device of the present invention will be described below with reference to the drawings using a color liquid crystal cell used for a computer display, a video monitor and a television. The parts corresponding to those of the conventional example shown in FIG.

As shown in FIG. 2, a color liquid crystal display cell 1 as a liquid crystal display device has a color formed by a glass substrate similarly to an active matrix array substrate 2 formed by a glass substrate and having predetermined electrodes. The filter substrates 3 are opposed to each other, and a spacer (not shown) is interposed between the active matrix array substrate 2 and the color filter substrate 3 to form liquid crystal enclosed spaces 4 at predetermined intervals.
Then, the periphery of the active matrix array substrate 2 and the color filter substrate 3 is sealed with a sealant 5,
Liquid crystal is sealed in the liquid crystal enclosure space 4.

Further, the active matrix array substrate 2
A transparent pixel electrode (not shown) and a thin film transistor portion that drives this pixel electrode are arranged in a matrix on the upper side, and are driven through the drain electrode by the gate electrode and the source electrode. Further, an external connection electrode 6 is formed on the active matrix array substrate 2, a gate electrode and a drain electrode are formed on the external connection electrode 6, and the external connection electrode 6 is provided with the external connection electrode 6 after the color liquid crystal display cell 1 is manufactured. A drive IC (not shown) is connected.

During the manufacturing process, the external connection electrode 6
Is covered with a protective resist film 7.

Next, the manufacturing method of the above embodiment will be described with reference to FIG.

A color liquid crystal display cell 1 is formed by using the active matrix array substrate 2 and the color filter substrate 3 as a glass substrate having a plate thickness of 1.1 mm.

Then, a protective resist film 7 is formed on the external connection electrodes 6 of the color liquid crystal display cell 1. The protective resist film 7 can be formed by various methods such as nozzle spraying or brush coating, and is formed in a predetermined shape that protects only the external connection electrodes 6.

Next, the color liquid crystal display cell 1 having the protective resist film 7 formed thereon is dipped in the glass etching solution 12 in the etching tank 11. Also, this glass etching solution
12 can be prepared by adjusting the temperature of a 5% solution of hydrofluoric acid, and the dipping method depends on the required productivity such as cassette batch type device or single wafer shower type device. it can. Although the glass etching action on the color liquid crystal display cell 1 is generated isotropically,
Since the external connection electrode 6 is covered with the protective resist film 7, it is not etched, and the thickness direction of the color liquid crystal display cell 1 is mainly formed.

After a lapse of a predetermined time, the color liquid crystal display cell 1 is taken out of the etching tank 11 containing the glass etching solution 12, the color liquid crystal display cell 1 is washed, and the protective resist film 7 is removed. The protective resist film 7 can be removed in various ways such as by using a resist stripping solution.

According to the above embodiment, the glass etching liquid
By keeping the 12 conditions and the elapsed time constant, the etching amount of the glass substrate can be made substantially constant, and the color liquid crystal display cell 1 can be continuously manufactured.

Further, after manufacturing the color liquid crystal display cell 1 using a conventional glass substrate having a thickness of 1.1 mm as a raw material, only the plate thickness can be reduced, so that the manufacturing process of the color liquid crystal display cell 1 needs to be changed. Instead, it can be thinned to a predetermined thickness simply by adding a glass etching step.

[0027]

According to the method of manufacturing a liquid crystal display device of the present invention, a resist film for protecting the external connection electrodes is formed, and after the step of forming the resist film, a glass etching process is performed to form two glass plates. Since the plate thickness of the substrate is uniformly thinned, the glass substrate as a material can be thinned without being thinned, so that the glass substrate can be thinned without being deformed such as warped or bent.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a method of manufacturing a color liquid crystal display cell of an embodiment of the liquid crystal display device of the present invention.

FIG. 2 is an explanatory diagram showing a color liquid crystal display cell of the same as above.

FIG. 3 is an explanatory diagram showing a conventional color liquid crystal display cell.

[Explanation of symbols]

1 Color Liquid Crystal Display Cell as Liquid Crystal Display Device 2 Active Matrix Array Substrate Made of Glass Substrate 3 Color Filter Substrate Made of Glass Substrate 4 Liquid Crystal Enclosed Space 6 External Connection Electrode 7 Protective Resist Film as Resist Film

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02F 1/1333 G02F 1/13 101 G02F 1/1345

Claims (2)

(57) [Claims] 1. Two mowers each having a predetermined electrode pattern formed thereon.
A liquid crystal filled space is formed between the lath substrates and arranged opposite to each other.
The liquid crystal is enclosed in the liquid crystal enclosure and is connected to the outside.
Forming a resist film for protecting the external connection electrode in a method of manufacturing a liquid crystal display device having a partial connection electrode
If, after this resist film formed was step, glass etching down
The thickness of the two glass substrates is uniformly reduced by
And a step of making the two glass substrates into a predetermined plate thickness,
; And a step of removing the strike layer is washed, the step of forming the resist film, a method of manufacturing a liquid crystal display device characterized in that after the step of forming the liquid crystal display device. 2. A glass etching process, the manufacturing method according to claim 1 Symbol mounting the liquid crystal display device of a liquid crystal display device forming a resist film was characterized by immersing in an etching solution.