JP2520751Y2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a liquid crystal display device used in a computer terminal device, a high definition television or the like.

[Conventional technology]

A liquid crystal display device has been put to practical use as a flat-panel 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 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, it is necessary to have a large area and high definition, and a high electrode pattern pitch is required. Densification 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, due to bending of the glass substrate and contraction of the liquid crystal itself,
Since it is difficult to keep the thickness of the liquid crystal layer uniform, spacers made of glass fibers or glass beads having an appropriate size are interposed in the liquid crystal.

Then, in order to reduce the thickness of the liquid crystal layer, it has been proposed to interpose polymer particles obtained by a floating polymerization method in the liquid crystal layer between the electrodes (see, for example, JP-A-61-128226). .

[Problems to be solved by the invention]

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

In addition, the spacers are also present on the electrodes serving as the display unit, 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 that solves the above-mentioned problems.

[Means and Actions for Solving Problems]

In order to achieve the above-mentioned object, the present invention has at least a pair of electrode substrates having electrodes provided on the surface and an alignment film provided on the electrodes, and facing the alignment films, and between the pair of electrode substrates. In a liquid crystal device having a liquid crystal layer sealed in, a spacer that has a substantially circular cross section and is provided between a pair of electrode substrates, and a spacer that is bonded and fixed in direct contact with one of the electrode substrates, and a pair of electrode substrates. It is characterized in that it is formed only around the electrode substrate contact portion of the former spacer on only one of the electrode substrates and has an adhesive for fixing the former spacer by adhesion.

This allows the spacer to be correctly fixed at the position where the display is removed.

Further, not only the above-mentioned adhesive and the spacer are separated but also the particles having the adhesive layer formed on the surface of the spacer are used, and the particles are applied and formed at predetermined positions so that the adhesive and the spacer are simultaneously specified. You may form in the position of.

〔Example〕

FIG. 1 shows an embodiment of the present invention, and FIG. 2 is a plan view of the bonding state of the spacer 5 on the [II] side of FIG. FIG. 1 shows a liquid crystal display device according to the present invention together with two methods for manufacturing the same.

FIG. 1 (C) shows one embodiment of the present invention and shows a completed liquid crystal display device. In the figure, 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. The glass substrate 9 having the upper electrode 8 and the upper alignment film 7 is fixed via the spacer 5, and the liquid crystal 6 is enclosed 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 that run in the vertical and horizontal directions, respectively.

This invention is characterized in that the spacer 5 is well classified and has a uniform particle size, and is fixed by an adhesive 4 at a predetermined position where the intersection of the electrodes 2 and 8 is removed.

FIGS. 1A and 1B show two methods for manufacturing such a liquid crystal display device.

 First, [I] 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. An inorganic spacer such as glass fiber, glass beads, ceramics, etc., or a polymer spacer produced by an emulsion polymerization method, a suspension polymerization method or the like is temporarily adhered to the substrate 1 coated with the adhesive 4. After that, the substrate 1 is blown by a spray 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 to the adhesive application portion. It goes without saying that the spacers can be made uniform in distribution by uniformly applying the adhesive to predetermined positions.

 Next, [II] on the right side of the figure will be described.

In this case, the microcapsules 10 in which the adhesive 4 is applied to the spacers 5 in advance are used. The microcapsules are placed at a predetermined position on the substrate by means of screen printing or the like, and then fixed by thermocompression or the like.

That is, after being placed at a predetermined position of the microcapsule 10,
When the thermocompression bonding is performed, the adhesive 4 on the spacer 5 is brought into a fluid state due to heating, moves on the outer peripheral surface of the spacer 5 and drops downward to be fixed. At this time, the spacer 5 also moves downward and comes into direct contact with the substrate, so that the adhesive is present only around the substrate contact portion of the spacer shown in FIG. 1 (B). FIG. 2 shows a state in which the spacer 5 portion at this time is viewed from above.

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.

As the spacer, a conductive material such as metal particles or polymer-plated powder obtained by plating polymer powder can be used. In this case, it can be used also as a wiring for connecting the upper and lower electrodes of a predetermined portion, and the size of the entire display device can be reduced.

[Advantage of Device] According to the device described above, the spacers can be arranged so that the density becomes uniform, so that 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.

The adhesive of the present invention is formed only on a necessary portion on the alignment film. In other words, no adhesive is formed on the surface of the alignment film on the electrode that serves as the display section. Therefore, only the liquid crystal exists between the alignment films of the electrode substrates facing each other, and high-quality display is possible.

Since the adhesive is provided only around the contact area on one of the substrates of the spacer whose cross section is almost circular, less adhesive is needed, so contamination does not occur due to the spread of this adhesive. It is easy to position and the spacer to be 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 parallelism between the substrates is extremely high. Can be held satisfactorily.

Further, since the spacer does not move in the liquid crystal, a highly reliable liquid crystal display device that is resistant to vibration and does not deteriorate in display quality for a long time can be obtained.

Furthermore, by using particles having an adhesive layer formed on the spacer surface, the adhesive and the spacer can be simultaneously provided at predetermined positions.

[Brief description of drawings]

FIG. 1 is a view showing the liquid crystal display device according to the present invention together with its manufacturing method, and FIG. 2 is a plan view of a spacer and an adhesive portion on the [II] side of FIG. 1 (B). 1, 9 ... Glass substrate, 2, 8 ... Electrode, 3, 7 ... Alignment film, 4 ... Adhesive, 5 ... Spacer, 6 ... Liquid crystal layer.

Continuation of front page (56) Reference JP-A-49-107196 (JP, A) JP-A-56-42212 (JP, A) JP-A-60-200228 (JP, A) JP-A-61-45223 (JP , A) Actual opening 51-40355 (JP, U) Actual opening 60-135724 (JP, U) Actual opening 55-116318 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A liquid crystal layer sealed between at least a pair of electrode substrates, each having an electrode provided on the surface and an alignment film provided on the electrode, the alignment films facing each other. In a liquid crystal device having: a cross section having a substantially circular shape, provided between a pair of electrode substrates,
The spacer, which is bonded and fixed by directly contacting one of the electrode substrates, and the spacer, which is formed only around the electrode substrate contact portion of the spacer in the previous period on only one of the pair of electrode substrates, is bonded in the previous period. An adhesive for fixing the liquid crystal display device.