JPH03215828A - LCD panel - Google Patents

Abstract

PURPOSE:To prevent the generation of low-temp. bubbles in a display region by providing a region where a liquid crystal is not packed on the outside of the display region in the liquid crystal panel. CONSTITUTION:Polyimide resins are printed as oriented films on transparent electrodes of two sheets of glass substrates 11a, 11b formed with the transparent electrodes and the surfaces thereof are subjected to a rubbing treatment. A sealing material 12 formed by using a thermosetting resin is thereafter printed on one glass substrate 11b and glass fibers are sprayed as spacers on the other glass substrate 11a. Two sheets of the glass substrates 11a, 11b are then stuck to each other. A liquid crystal 13 is thereafter injected from an injection port 17 to pack the display region 14. The packing is stopped where an unpacked region 16 remains. The injection port 17 is sealed by a sealing material 15, by which the liquid crystal panel is formed. The part 16 of this liquid crystal panel where the liquid crystal 13 is not packed expands at a low temp. The generation of the low-temp. bubbles in the display region 14 occurring in the thermal shrinkage of the liquid crystal 13 is thus obviated.

Description

[Detailed description of the invention] Industrial applications The present invention can be applied to two types of liquid crystal devices such as calculators and word processors. The present invention relates to liquid crystal panels used in display devices.

Conventional technology Liquid crystal display devices are used in watches, calculators, word processors, etc. due to their thinness, light weight, and low power consumption.
In recent years, with the development of information-related equipment, large display capacities and
Demand for displays with large display areas is increasing.

The liquid crystal panel used in this liquid crystal display device has a structure as shown in FIG. There is. Note that an alignment film 10 is provided on the second side of the transparent electrode 9. These two substrates 1a and 1b are kept at a constant distance (hereinafter referred to as a gap) by a spacer 7, which is generally 5 to 10 μm. Moreover, this baser 7 uses polystyrene resin balls (for example, Micro Pearl (manufactured by Sekisui Chemical Co., Ltd.)).

Problems to be Solved by the Invention Such liquid crystal panels have the following problems.
・-7 There was.

In order to easily make the gap of the liquid crystal panel uniform, the substrate 1 is placed through a rigid spacer 7 as shown in FIG. 6(a).
What is necessary is to sandwich a and 1b and fill the required amount of liquid crystal 3.

However, such liquid crystal panels cannot be heated at low temperatures (for example, -20
℃), the volume between the substrates 1a and 1b where the liquid crystal 3 is filled does not change due to the rigid spacer 7, as shown in FIG. Reduced by heat shrinkage. As a result, air bubbles 8 (hereinafter referred to as liquid crystal filling area) are formed in the interior surrounded by the sealing material 2 (hereinafter referred to as liquid crystal filling area).
Described as low temperature bubbles. ) occurs. These low-temperature bubbles 8 are generated in any part of the liquid crystal filling area, and may not disappear even when the temperature is returned to normal temperature.

Therefore, in conventional liquid crystal panels, spacers with some degree of elasticity are used to absorb the volume reduction due to thermal contraction of the liquid crystal by changing the filling volume of the liquid crystal due to the contraction of the spacer 7, as shown in FIG. 6(C). The generation of low-temperature bubbles 8 is prevented.

However, in this technology, since the spacer 7 has elasticity,
High precision manufacturing conditions are required to make the gasop uniform.

An object of the present invention is to solve these problems and provide a liquid crystal panel that is easy to manufacture and does not generate low-temperature bubbles.

Means for Solving the Problems In order to achieve this object, the present invention is constructed by sealing a liquid crystal between two substrates each having a transparent electrode using a sealing material.
A portion surrounded by the sealing material and outside the display area is provided with a portion not filled with the liquid crystal.

In addition, the area surrounded by the sealing material is partitioned into a display chamber containing the display area and a spare chamber connected to the display chamber by a liquid crystal flow port, and the display chamber is provided with a space between the two substrates. A spacer is provided in the preparatory chamber, and no spacer is provided in the preliminary chamber.

According to the present invention, since there is provided a portion of the liquid crystal panel surrounded by the sealing material and outside the display area that is not filled with liquid crystal in advance, liquid 6. Volume loss can be accommodated by expansion of this unfilled area.

Therefore, generation of low-temperature bubbles in the display area can be prevented.

In addition, if a spacer is not installed in the preliminary chamber, the volume reduction due to thermal contraction of the liquid crystal can be offset by replenishing the liquid crystal filled in this preliminary chamber, and the generation of low-temperature bubbles can be prevented. .

EXAMPLE Hereinafter, a liquid crystal panel according to an example of the present invention will be described with reference to the drawings.

Example 1 As shown in FIG. 1, polyimide resin is printed as an alignment film on the transparent electrodes of two glass substrates 112L and 11b on which transparent electrodes are formed, and the surfaces thereof are subjected to a rubbing treatment.

(Omitted in the figure). Thereafter, a sealing material 12 using a thermosetting resin is printed on one glass substrate 111), and glass fibers having a wire diameter of 6 μm are sprinkled as spacers on the other glass substrate 11a.

6./゛Next, the two glass substrates 11a and 1lb are bonded together, and the sealing material 12 is cured. After that, the sealing material 12
After filling the display area 14 by injecting the liquid crystal 13 using the vacuum injection method through the injection port 17 provided in the
Filling is stopped at a point where the liquid remains, and the injection port 17 is sealed with a sealing material 15 to form a liquid crystal panel.

When polystyrene resin balls were used as spacers as in the past, it was not easy to obtain a uniform gap. Furthermore, when glass fibers were used as a baser to easily make the gas drop uniform, low-temperature bubbles were generated in arbitrary parts of the liquid crystal filling area. However, in the liquid crystal panel manufactured according to this example, a uniform gap can be easily obtained using a glass fiber, and at low temperatures, the portion 16 where the liquid crystal 13 is not filled expands and the liquid crystal 13
There is also no generation of low-temperature bubbles in the display area 14 due to thermal contraction. Table 1 shows the gap accuracy and low-temperature bubble generation rate of the conventional panel and the panel of this example.

Example 2 Descriptions of steps similar to those in Example 1 will be omitted.

As shown in FIG. 2, an ultraviolet curing resin is printed on a glass substrate 11b as a sealant 12. Here, the shape of the sealing material 12 is such that the display chamber 18 including the display area 14 and the preliminary chamber 19 are connected by the liquid crystal flow port 20 . After that, the liquid crystal 13 is placed on the glass substrate 11b on which the sealing material 12 is printed.
A required amount of the solution is dropped, and glass fibers having a wire diameter of 6 μm are sprinkled on the other glass substrate 11a as spacers. At this time,
The amount of liquid crystal to be dropped is such that a portion 16 that is not filled with liquid crystal 13 remains in the preliminary chamber 19. Next, the two boards 1
1a and 1lb are bonded together in a vacuum and the sealing material 12 is cured to form a liquid crystal panel.

In the liquid crystal panel of this embodiment as well, the ganop becomes uniform easily, and although the liquid crystal 13 undergoes thermal contraction at low temperatures, the region 16 where the liquid crystal 13 is not filled expands, and the liquid crystal 13 in the display area 14 Since the shrinkage of the display area 14 is absorbed, low-temperature bubbles are not generated within the display area 14.

9 Vane Note that the shape of the sealing material 12 is not limited to that of this embodiment, and as shown in FIG. Various shapes are possible as long as they do not expand into the display area 14. Further, the baser is not limited to glass fibers, but may be any material having high diameter accuracy and rigidity, such as S102 beads.

Example 3 Descriptions of steps similar to those in the second embodiment will be omitted.

As shown in FIG. 4, liquid crystal 13 is dropped onto the substrate 11b on which the sealing material 12 is printed (not shown), and glass fibers 21 having a wire diameter of 6 μm are sprinkled as spacers only in the region of the display chamber 18. Next, as in the second embodiment, the substrates are bonded together to form a liquid crystal panel.

Even in the liquid crystal panel manufactured according to this example, the gap in the display area can be easily made uniform. Furthermore, since no spacer is provided in the preliminary chamber 19, the ganop of the preliminary chamber 19 becomes smaller at low temperatures. do not.

It is preferable that the preparatory chamber 19 in this embodiment has a size that can store an amount of liquid crystal that is greater than the amount that would shrink if left at a low temperature, and that allows the glass substrate to be easily bent.

In addition, in the above embodiments, there is a certain margin in the size of the part that is not filled with liquid crystal and the amount of liquid crystal filled in the preliminary chamber, so high accuracy is not required in the amount of liquid crystal to be filled. Another advantage is that it can be easily manufactured.

Effects of the Invention According to the present invention, by providing a portion outside the display area of the liquid crystal panel that is not filled with liquid crystal, the liquid crystal fills in the liquid crystal to compensate for the volume reduction caused by thermal contraction of the liquid crystal at low temperatures. It can be absorbed by expanding the parts that are not. As a result, generation of low-temperature bubbles within the display area can be prevented. Furthermore, if a preliminary chamber is provided without a spacer, the decrease in volume of liquid crystal at low temperatures is replenished by 11 pages of liquid crystal filled in the preliminary chamber, thus preventing the generation of low-temperature bubbles.

Furthermore, since a rigid spacer is used, a uniform gap can be easily formed.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams showing a liquid crystal panel in one embodiment of the present invention, FIGS. 3 a and b are explanatory diagrams showing the shape of a sealing material in another embodiment of the present invention, and FIG. 4 6 is an explanatory diagram showing the spacer dispersion process in an embodiment of the present invention, FIG. 6 is a cross-sectional view of a conventional liquid crystal panel, FIGS. 6 a and b are explanatory diagrams showing the mechanism of generation of low-temperature bubbles, and FIG. FIG. 2 is an explanatory diagram showing a mechanism for preventing the generation of low-temperature bubbles in a conventional panel. 111L, 1lb... Board, 12...
Sealing material, 13...Liquid crystal, 14...Display area, 15...Sealing material, 16...Portion not filled with liquid crystal, 17. ...Inlet, 1
8...Display room, 19...Preliminary room, 2o
・・・・・・LCD outlet, 21・・・Glass sensor.

Claims (3)

[Claims] (1) A liquid crystal is sealed between two substrates with transparent electrodes using a sealing material, and a portion surrounded by the sealing material and not filled with the liquid crystal outside the display area. A liquid crystal panel characterized by the following features: (2) The area surrounded by the sealing material is partitioned into a display chamber containing the display area and a preliminary chamber connected to the display chamber by a liquid crystal flow port, and a portion of the preliminary chamber that is not filled with liquid crystal is separated. 2. The liquid crystal panel according to claim 1, further comprising: a liquid crystal panel. (3) The liquid crystal panel according to claim 2, wherein the display chamber is provided with a spacer for maintaining the distance between the two substrates, and the preliminary chamber is not provided with a spacer.