JPH081689U - Liquid crystal display - Google Patents

Abstract

(57) Abstract: Provided is a liquid crystal display device in which a substrate interval is accurately maintained. A liquid crystal display device having a liquid crystal layer enclosed between at least a pair of electrode substrates facing each other with an alignment film provided on the surface and an alignment film provided on the electrode. The adhesive 4 is applied on the electrode substrate at a predetermined position in advance, and the spacer 5 is adhered and fixed to the applied adhesive.

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device used for a computer terminal device or a high definition television.

[0002]

2. Description of the Related Art A liquid crystal display device has been put to practical use as a flat plate-shaped display element replacing a CRT. In this, liquid crystal is enclosed between two upper and lower glass substrates to have a uniform thickness, and a voltage is applied to the electrodes provided on both glass substrates to drive the liquid crystal for display.

This liquid crystal display device is used or is planned to be used for a computer terminal display device, a high-definition television or the like, but in any case, a large area and high definition are required, and an electrode pattern is required. Higher pitch density is required. Further, high-speed response is required, and further thinning of the liquid crystal layer is required.

In this large-area, high-density electrode pattern thin liquid crystal display device, it is difficult to keep the thickness of the liquid crystal layer uniform because of the deflection of the glass substrate and the contraction of the liquid crystal itself. Spacers made of glass fibers, glass beads, etc. of an appropriate size are placed inside.

In order to reduce the thickness of the liquid crystal layer, it has been proposed to interpose polymer particles obtained by the floating polymerization method in the liquid crystal layer between the electrodes (for example, Japanese Patent Laid-Open No. 61-12 8226). (See the official gazette).

[0006]

However, in such a conventional liquid crystal display device, since the spacers are applied and dispersed by a dipping means, a spinner, etc., there is a variation in spacer density when the liquid crystal display device is assembled. Since the display is large, the display is not uniform, and the components of the liquid crystal are partially different, there is a problem that the deflection of the substrate and the contraction of the liquid crystal itself cannot be completely prevented.

Further, the spacer is also present on the electrode serving as the display portion, which causes a problem that the display quality is deteriorated. The present invention has been made in view of the above circumstances, and an object thereof is to provide a high-density, high-quality liquid crystal display device and a method for manufacturing the same, which solve the above-mentioned problems.

[0008]

To achieve the above object, in the present invention, for example, a spacer is fixed at a predetermined position between electrodes by an adhesive means.

As a result, the spacer can be correctly fixed at the position where the intersection of the electrodes is removed. In addition, the spacers can be brought into direct contact with the substrate to maintain accurate substrate spacing.

[0010]

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 shows an embodiment of the present invention. FIG. 1 shows a liquid crystal display device according to the present invention together with two methods for manufacturing the same.

FIG. 1C shows an embodiment of the present invention, which shows a completed liquid crystal display device. In the figure, reference numeral 1 is a glass substrate, on which a lower electrode 2 having a predetermined pattern is provided. A lower alignment film 3 is provided to cover the electrode 2 and the glass substrate 1, and a spacer 5 is fixed on the alignment film 3 with an adhesive 4. A glass substrate 9 having an upper electrode 8 and an upper alignment film 7 is fixed via the spacer 5, and a liquid crystal 6 is sealed inside. The electrodes 2 and 8 are processed into a predetermined pattern, but in the case of a flat panel display device, they are formed into a large number of strip-shaped electrodes running in the vertical direction and the horizontal direction, respectively.

In this invention, the spacer 5 can be well classified and have a uniform particle size, and can be fixed to the predetermined position where the intersection of the electrode 2 and the electrode 8 is removed by the adhesive 4. Further, the spacer can be brought into direct contact with the substrate to accurately maintain the substrate spacing.

FIG. 1A and FIG. 1B show two methods for manufacturing such a liquid crystal display device. First, [1] on the left side of the drawing will be described.

After the electrodes 2, 2, ... And the alignment film 3 are formed on the glass substrate 1, the adhesive 4 is applied on the substrate at a predetermined position by a dispenser or screen printing. To the substrate 1 on which the adhesive 4 has been applied, a spacer made of an inorganic material such as glass fiber, glass beads, ceramics, or a spacer made of a polymer prepared by an emulsion polymerization method, a suspension polymerization method or the like is temporarily adhered. After that, the substrate 1 is blown by spraying or the like to remove the extra spacers other than the adhesive application portion, and the adhesive is cured under pressure. According to this, the spacer can be fixed only on the adhesive application portion. It goes without saying that the distribution of the spacers can be made uniform by applying the adhesive evenly to the predetermined positions.

Next, [2] on the right side of the drawing will be described. In this case, the microcapsules 10 having the spacers 5 coated with the adhesive 4 in advance are used. The microcapsules are arranged at predetermined positions on the substrate by means of screen printing or the like, and then fixed by thermocompression or the like.

In this way, the glass substrate 9 on which the alignment film 7 and the upper electrode 8 are formed is arranged on the substrate on which the spacer 5 is fixed at a predetermined position, and the liquid crystal 6 is sealed inside to complete the display device. To do.

[0017]

According to the present invention described above, since the spacers can be arranged so that the density becomes uniform, the deflection of the substrate and the contraction of the liquid crystal itself can be well compensated, and the display screen can be made uniform.

In the present invention, the adhesive is formed only on a necessary portion on the alignment film. That is, no adhesive is formed on the surface of the alignment film on the electrode that serves as the display unit. Therefore, only the liquid crystal exists between the respective alignment films of the electrode substrates facing each other, which enables high quality display.

Since the adhesive is provided only on the periphery of the contact portion on one of the substrates of the spacer having a substantially circular cross section, a small amount of adhesive is required, so that the spread of the adhesive does not cause contamination. Moreover, it is easy to position the adhesive and make the spacer a single layer.

Further, since the spacer and the substrate are in direct contact with each other, there is no adhesive between the spacer and the substrate, and therefore the distance between the substrates can be maintained with high accuracy, so that the distance between the substrates can be maintained. The parallelism can be maintained very well.

Further, since the spacer does not move in the liquid crystal, it is possible to obtain a highly reliable liquid crystal display device which is resistant to vibration and which does not deteriorate the display quality for a long period of time. Further, by using particles having an adhesive layer formed on the surface of the spacer, the adhesive and the spacer can be simultaneously provided at predetermined positions.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a method of manufacturing a liquid crystal display device according to the present invention.

[Explanation of symbols]

 1 Glass Substrate 2 Electrode 3 Alignment Film 4 Adhesive 5 Spacer 6 Liquid Crystal Layer 7 Alignment Film 8 Electrode

Claims (3)

[Scope of utility model registration request] 1. A liquid crystal display device having a liquid crystal layer sealed between at least a pair of opposing electrode substrates, wherein a spacer is adhered and fixed at a predetermined position in the liquid crystal layer. 2. A liquid crystal display device having an electrode provided on a surface thereof, an alignment film provided on the electrode, and a liquid crystal layer enclosed between at least a pair of electrode substrates facing each other, A method for manufacturing a liquid crystal display device, characterized in that an adhesive is applied in advance on a predetermined position on the electrode substrate, and a spacer is adhered to the applied adhesive and fixed. 3. A liquid crystal display device comprising a liquid crystal layer having an electrode provided on the surface thereof, an alignment film provided on the electrode, and having a liquid crystal layer sealed between at least a pair of electrode substrates facing each other. A method for manufacturing a liquid crystal display device, comprising: arranging microcapsules in which an adhesive is applied to a spacer in advance at a predetermined position on the electrode substrate and then adhering and fixing the microcapsules.