JPS5875113A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To simplify a liquid crystal injecting operation, and to raise its efficiency, by providing a sealing material having >=2 opening parts, on a transparent electrode, sticking two electrode substrates to each other through the sealing material, and thereafter, injecting a liquid crystal by a capillary action. CONSTITUTION:A panel 9a is formed by printing a sealing material 10 having 2 opening parts of injecting ports 10a, 10b, on a transparent electrode of a glass substrate. As for the sealing material 10, an inorganic material such as organic sealing resin, glass is used. A panel 9 is obtained by sticking two panels 9a through the sealing material 10, and forming them as one body. Subsequently, the panel 9 is heated at about 120 deg.C, and is immersed in the upper part of a liquid crystal 11 in a vessel 12. The liquid crystal 11 rises in its temperature, and ascends to the intermediate part of the panel 9. It becomes one liquid crystal element by executing exhaust from the injecting port 10b. Also, in case when a number of sealing materials 10 have been provided on a large substrate 14, >=2 opening parts are formed, and the liquid crystal injecting work is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display element that can extremely easily simplify the process of injecting liquid crystal between two glass substrates having transparent electrodes in the manufacture of the liquid crystal display element. It is something.

It is known that the optical anisotropy of liquid crystals is used to apply it to display devices, and the main method used for this display is nematic liquid crystal compounds with positive dielectric anisotropy. The so-called TN, which changes the decorative properties by orienting the
The Ft type is the mainstream. In addition, we have developed a nematic liquid crystal compound, a dust-host type (G-H
type) has also been put into practical use.

Even in these different types of liquid crystal display devices, there is nothing wrong with using liquid crystal, so the liquid crystal is placed between two glass plates with transparent electrodes (8 to 12 μm) without bubbles. It goes without saying that injection is extremely important in manufacturing liquid crystal display elements.

A conventional example will be explained using FIGS. 1 and 2.6 As shown in FIG.
(Using I-150 to 325 Tetron mesh or stainless steel mesh, L, print with injection port 2-m by screen-7 printing. The width of this printed sealing material is 0.3 to 1 mm. .2 ■ If you wish. In Figure 2, the two glass plates are bonded together by heating after overlapping the glass substrates 1-bt. Since spacers (glass fiber slits or aluminum oxide balls with a diameter of 8 to 12 μm) are mixed in to adjust the distance between the substrates 1-a and 1-b, the distance between the two glass plates 1-ael-b is F18. ~12
μm is maintained.

Liquid crystal is injected into the glass/gunnel constructed in this manner by the method shown in FIGS. 3, 4, and 5. Fig. 3 shows the pressure reduction process in the injection process. In this figure, 3 is a vacuum chiper, 6 is a vacuum I pump, and 7 is a vacuum chamber and a vacuum I pump.
It is a pulp provided in the middle of the pump, and a container containing four liquid crystals 5. Reference numeral 8 indicates a pal'zo which communicates the atmosphere with the vacuum chamber, and is closed during this depressurization process. A in vacuum chamber 3? After putting in the pulp 1, the pulp 7 is opened, and the vacuum chamber 3 is evacuated until the pressure inside the vacuum chamber 3 becomes 1 mHg or less. Next, as shown in Fig. 4, after closing the pulp 7, the no. Nell.

The injection port 2-a of No. 1 is immersed into the container 4 containing the liquid crystal 5. Thereafter, as shown in FIG. 4, the pulp 8 is opened and the pressure inside the chamber 3-a is returned to atmospheric pressure by introducing atmospheric air or an inert gas (V-reduction process). - Inject the liquid crystal into the channel from a to no. 4, and when the liquid crystal is completely injected as shown in FIG. 5, the panel 1 is pulled up from the liquid crystal reservoir 4 and the injection process is completed. In addition, in this injection process, if the liquid crystal remains at room temperature, it will not be completely injected into the tube due to the high viscosity of the liquid crystal. Therefore, in the injection process, the panel will be heated to a temperature of 100 to 120 degrees Must have been. In addition, during the leakage process, if the pressure is suddenly returned to atmospheric pressure, the glass of the panel will bend due to the pressure difference between the inside and outside of the i9 panel, and the oriented electrodes may come into contact and be damaged. Since bubbles may remain in the channel and the liquid crystal may not be injected sufficiently, it is necessary to return the pressure to atmospheric pressure over a period of 3 to 15 minutes. In addition, there are true tank chambers, vacuum pumps, etc.
), the conventional liquid crystal injection method is unsuitable for simplifying the process, as it is impossible to regenerate a panel that contains bubbles even if the injection fails even once.

The present invention will be explained below using FIGS. 6 and 7.

In the 6th A, above the glass substrate 9-a K Sea A/
There is a hole in the material 10, and this sealing material is cut at two places, 10-a and 10-b.
-m and 2-b inject liquid crystal.

As shown in FIG. 7, by simply immersing the i4 channel 9 into the container 12 containing the liquid crystal 11, the liquid crystal will flow from the injection port 10-a to the t-10 by capillary action. Injected into the channel.

According to this method, the injection process, which conventionally involved a depressurization leak process that required equipment such as a vacuum chamber and a vacuum pump, can be simplified at once.

The following table shows a comparison between the conventional method and the present invention.

The present invention will be explained with examples.

After thoroughly cleaning a 1 m thick glass substrate formed into a slam-like shape for a transparent electrode for a liquid crystal display, a polyamic acid solution is applied as an alignment film. Application methods in this case include spin coating, dip coating, and printing! Method 4 Any method may be used, and the concentration of the cibolyamic acid solution varies depending on the application method (in the range of 0.5 to 7.0% wt).

In this example, spin coating was performed using a solution of 11% wt, and then heat treatment was performed at a temperature of 350° C. for 20 minutes to cure the polyamic acid into polyimide. Next, after rubbing the polyimide surface, a sealing resin 10 is printed in the shape shown in FIG. For the sealing resin, 30 parts by weight of talc was mixed as a filler with a mixture of epoxy resin and acid anhydride curing agent, and 2 parts by weight of aluminum oxide balls with a diameter of 10 μm were used to maintain the gear lag of the glass substrate. Add parts. This well-mixed sealing resin is screen printed using a 325 mesh stainless steel screen. At this time, if the width of the stainless steel screen is 0.4+w, the width of the 9' seal resin printed on the glass substrate is 0.4 to 0.5+s+.

Furthermore, the glass substrates that have been subjected to the above-mentioned rubbing treatment are stacked and bonded together, and 0.0
A heavy film is placed on the glass substrates bonded together so that a load of 8 to 0.1 kFI is applied, and heat treatment is performed at a temperature of 180° C. for 3 hours to harden the sealing resin. The width of the sealing resin after hardening is approximately 0.9 to 1+w+.The liquid crystal display/armpit thus prepared is placed against a liquid crystal tray containing a T-N type liquid crystal. In this case, it is necessary to reduce the viscosity of the liquid crystal, so the liquid crystal display spring is preheated to 120° C. in a drying oven.

If you leave this LCD display panel for about 2 minutes,
Inlet 10a w or 10- by capillary action
Liquid crystal is filled in the liquid crystal display/9 channel which is adhered with a distance of 10 μm from b. At this time, the liquid crystal also gets into the outer side 13 of the sealing resin, but since the amount is small, it can be completely removed by washing later. The injection ports 10-a and 10-b of the liquid crystal display panel A' into which the liquid crystal has been injected in this manner are sealed with resin. Apply an epoxy resin mixed with an amine curing agent to the upper and lower injection ports, and -
When left for t1 day and night, the resin hardens and the liquid crystal is sealed within the panel.

FIG. 10 shows another embodiment of the invention.

40 pieces of sealing material 10 are printed on one large glass substrate 14 (150 squares x 112 squares), and one liquid crystal display element is a portion 14-a. At this time,
After printing and pasting the sealing material 10 and thermosetting it,
The glass substrate 14 is cut in the longitudinal direction.

As shown in FIG. 11, when the cut liquid crystal display element block 15 is preheated to a temperature of 120° C. and then placed in a liquid crystal dish 12, liquid crystal 11 is injected by capillary action.

As described above, the present invention can greatly simplify the liquid crystal injection process, which conventionally required a vacuum chamber, an exhaust device, etc., and involved a vacuum leak process.

[Brief explanation of drawings]

Figure 1 shows how the sealing material is printed on the glass substrate when using the conventional injection method, and Figure 2 shows how the sealing material used when using the conventional injection method is printed on the glass substrate and then laminated. A diagram showing the state when hardened, Figure 3 is a diagram showing the depressurization process in the employee's injection method, Figure 4 is a diagram showing the leak process in the conventional injection method, and Figure 5 is the injection process in the conventional injection method. 6th diagram showing the completion form of
7 is a diagram showing a liquid crystal injection process according to the present invention, FIG. 8 is a diagram showing an embodiment of the present invention, and FIG. 9 is a diagram showing a printing state of a sealing material on a glass substrate in the present invention. FIG. 10 is a diagram showing another embodiment of the present invention, and FIG. 11 is a diagram showing a liquid crystal injection method in the embodiment of FIG. 1... Riyanel, 2... Seal material, 3... Vacuum chamber, 4... Container containing liquid crystal (liquid crystal reservoir), 5...
・Liquid crystal, 6... Vacuum pump, 7... Valve (between vacuum chamber ← vacuum 471), 8... Valve (between atmosphere 0 vacuum chamber), 9... Hanel, 10... Seal material,
IO-a. 10-b... Inlet, 11... Liquid crystal, 12... Container, 13... Outside of sealing resin, 14... Glass substrate, 14-a... One liquid crystal display portion, 15 ...LCD display block. Patent Applicant Kei Matsu 1 Electric Industry Co., Ltd. 1 Agent Tsuneji Hoshino '11, 1s No. 311 Figure 4 Figure No. 5 Figure 4 Figure 6 Figure 1, Ob 0a Figure 7 0b 10a ll Figure 8 Figure 9 0a Figure 10

Claims (1)

[Claims] In a liquid crystal display element in which a liquid crystal layer is interposed between two glass substrates, at least one of which has a transparent electrode, an organic sequential resin provided so as to surround the liquid crystal layer sandwiched between the second glass substrate; Or a liquid crystal display element characterized in that the inorganic sealant has two or more openings.