JPS5926931B2 - liquid crystal injection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal injection device, and more particularly to an injection device that rapidly performs injection into a large area cell.

A liquid crystal cell has a liquid crystal sandwiched between a pair of substrates via a spacer, and when an electric field is applied to this cell, the arrangement of the liquid crystal molecules changes, creating a so-called electro-optical effect, and the electric field is applied. Numbers, letters, etc. are displayed based on the difference in contrast between the area and the area to which no voltage is applied.

A method of manufacturing such a liquid crystal cell is to arrange a pair of substrates with their electrode surfaces facing each other at a predetermined distance using spacers, etc.
After sealing the periphery, liquid crystal was injected through a pre-prepared hole, and then the hole was sealed.

As methods for injecting liquid crystal, attempts have been made to use capillary action, to reduce pressure inside the cell, or to inject liquid crystal by applying pressure.

However, all of these methods not only require time for injection but also have the drawback that bubbles are likely to be generated within the cell during injection. 20x20c especially required for certain applications
For large area cells such as Tn or 50x50 (V7l), the cell spacing is usually narrow, 10 to 20μ, and the injection area is wide, so the resistance due to the viscosity of the liquid crystal becomes extremely large, and these conventional methods In this case, injection was almost impossible.The present inventor previously invented a liquid crystal injection method that solved this drawback by injecting liquid crystal with the cell gap widened.

The present invention provides an apparatus suitable for carrying out the present invention. That is, the present invention provides a fixing member for fixing cells, a chuck member located on the upper part of the fixing member and movable up and down for sucking the cells fixed to the fixing member from the other side and widening the gap between the cells, and a liquid crystal display. The present invention provides a liquid crystal injection device comprising a syringe for injecting liquid crystal, and a heater for heating the liquid crystal is attached to at least one of the fixing member and the chuck member. Next, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows →1j of the cell before liquid crystal is poured into the cell, and the glass electrode plate 1 and the glass electrode plate 2 facing each other are sealed at the periphery with a sealing material 3 with a desired spacing between them.

One electrode plate has holes 4 for injecting and discharging liquid crystal.
is provided. FIG. 5 shows an apparatus for injecting liquid crystal into this cell.The cell is placed on a fixing member 6, and by applying reduced pressure through a pipe 8, the cell is sucked into a suction section 7 and fixed to the fixing member 6. Next, by rotating the handle 12, the chuck member 9 is lowered until it touches the other side of the cell and is fixed by the lock 13. Then, by reducing the pressure in the pipe 11, the cell is sucked onto the chuck member 9 by the suction unit 10. By rotating the gearbox handle 14, the chuck member 9 is moved upward and the cell gap is widened. The dial gauge 15 is for measuring the width of the cell gap. The amount of change in the gap can be measured using an electrical measurement method using a differential transformer or a strain gauge, or an optical method using interference. Next, the handle 19 is rotated and lowered until the tip of the syringe 16 matches the hole 4 of the cell, and the liquid crystal 5 is injected into the cell by applying pressure from the pipe 17. FIG. 2 shows a state in which the cell gap is widened, and FIG. 3 shows a state in which the cell gap is widened to lower the viscous resistance of the liquid crystal and the liquid crystal is injected.

In FIG. 5, reference numeral 18 denotes a heater attached to the injector 16 in order to raise the temperature of the liquid crystal and lower the viscosity of the liquid crystal to be injected. In the present invention, injection can be performed quickly and easily by widening the cell gap, but
Injecting the liquid crystal at a higher temperature lowers the viscosity of the liquid crystal, which is more desirable. When the temperature of the liquid crystal is raised and the liquid crystal is injected, especially in a large-area cell, temperature irregularities occur during the injection, which often results in uneven orientation of the liquid crystal molecules after the injection. In order to solve the problem of
It is also desirable to attach heaters 20 and 21 to the chuck member 9. By installing the heaters 20 and 21, the temperature of the liquid crystal can be controlled, and the liquid crystal can be uniformly injected without uneven injection. For this purpose, the fixing member 6
And the chuck member 9 is made of, for example, Cu. Al. It is preferable to use a substance with high thermal conductivity such as Fe, but it may also be formed from a semiconductor conductive material such as tin oxide or indium oxide.
In the present invention, after injection as described above, the pipe S, ll
By releasing the reduced pressure, the force on the cell is removed, and the liquid crystal is then discharged to obtain a liquid crystal cell having a predetermined spacing as shown in FIG.

To discharge the liquid crystal until it reaches a predetermined interval, you can suck the liquid crystal from the discharge hole, but in the case of this device, the handle 1
By rotating the chuck member 9 and pressurizing the cells, the cells can be easily discharged to a predetermined distance. As explained above, in the present invention, since the cell gap can be arbitrarily controlled by the fixed member and the chuck member that can move up and down, injection is easy and large-area cells can be quickly injected. .

Furthermore, since the temperature of the liquid crystal can be controlled by attaching a heater to the fixing member and the chuck member, uniform injection can be performed without uneven injection.

[Brief explanation of drawings]

Figure 1 is a plan view of a liquid crystal cell necessary for explaining the present invention, Figure 2 is a plan view of a liquid crystal cell necessary for explaining the present invention;
4 is a cross-sectional view of a cell for explaining a liquid crystal injection method, and FIG. 5 is a side view of an embodiment of a liquid crystal injection device according to the present invention. 6...Fixing member, 9...Chuck member, 16...Injector.

Claims (1)

[Claims] 1 A device for injecting liquid crystal into a cell having a hole for injecting and discharging liquid crystal and whose periphery is sealed while maintaining a desired spacing, a fixing member for fixing the cell, and an upper part of the fixing member. comprising a vertically movable chuck member for sucking the cells fixed to the fixing member from the other side and widening the gap, and a syringe for injecting liquid crystal, and for at least one of the fixing member and the chuck member. is a liquid crystal injection device equipped with a heater for heating the liquid crystal.