JPS5879218A - Liquid crystal display - Google Patents

Abstract

PURPOSE:To prevent the deformation of a display part owing to a change in temp. and to obtain a display of a specified color tone with respect to a liquid crystal display cell by providing the 1st cell including the display part and the 2nd cells contg. no display parts and providing communicating passage through which the movement of a liquid crystal is possible between two sets of the cells. CONSTITUTION:A GH type liquid crystal 12 is held between transparent electrode substrates 111 and 112 and the periphery is sealed with a sealant 13, whereby a liquid crystal display cell is obtained. The 1st cell A including the display part and the 2nd cells B1, B2 including no display parts are provided. The liquid crystal 12 is injected into the cell A through an injecting hole 17 and is sealed. The cell A is connected with the cells B1 and B2 through communicating passages 151, 152 of low conductance through which the liquid crystal 12 can move. When the liquid crystal 12 expands owing to temp. elevation or the like, the liquid crystal moves into the cells B1, B2 and absorbs stresses, whereby the deformation of the substrates 111, 112 is prevented. Thus the liquid crystal display free from uneven color tones is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention is a liquid crystal display device KW14 using a liquid crystal cell formed by holding a liquid crystal on a transparent electrode substrate portion and sealing the periphery.

[Technical background of the invention]

Currently, liquid crystal display devices are mainly used in island wristwatches and calculators, and are about to be widely used for displaying other I-band devices. Almost all of these liquid crystal display devices are 〒N(
(Twisted Nematic) all, but recently Dust Host 1 has also been considered. There are two main types of dust host types. One is the electric field-
The applied color is almost colorless and the electric field applied part is colored, and the other type is the netry type, where the electric field applied part is colored and the electric field applied part is almost decolored.

A liquid crystal cell usually has a transparent electrode formed thereon and holds the liquid crystal in relation to a φ transparent electrode substrate such as a glass plate or a Zola film plate.
It is constructed by sealing its surroundings. This is T N II
%G HII are all the same.

[Problems with background technology]

The filled liquid crystal layer expands and contracts due to environmental temperature fluctuations,
The display characteristics and life characteristics of the liquid crystal cell deteriorate. That is, when the environmental temperature rises, the liquid crystal layer thermally expands, causing the central portion of the liquid crystal cell to swell. The sealing material around the liquid crystal cell is usually an organic adhesive such as 4Ki, which has already hardened before filling the liquid crystal, so even if the center of the liquid crystal cell swells due to a temperature rise of 85 degrees Celsius, the surrounding seal will remain intact. The thickness of the stop does not change between friends.

However, if this liquid crystal cell is kept under a product term of 85°C for a long time (e.g. 1000 hours) or kept under thermal cycles (e.g. -40°C 1 hour + 85°C 1 hour heat cycle 20 times). In this case, the sealing part cannot withstand the internal pressure accompanying the expansion of the liquid crystal within the cell, and the thickness of the sealing part increases irreversibly. In such a state, when the temperature is returned to room temperature, the liquid crystal will shrink or the thickness of the sealing portion will increase to +11, resulting in uneven thickness between the center and the periphery of the liquid crystal cell. As a result, in the NWi liquid crystal cell, a colored pattern due to interference fringes is produced, and in the GH11 liquid crystal cell, the display color becomes uneven, and the characteristics as a display cell are significantly impaired.

As a solution to the above problem, it has been proposed to leave a portion in the liquid crystal cell that is not filled with liquid crystal to absorb the volumetric expansion of the liquid crystal. However, simply providing a non-filled portion has the disadvantage that the display function of the IK is impaired if the non-filled portion overlaps with the display portion.

OBJECTS OF THE INVENTION The present invention solves the above problems and provides a liquid crystal display device that prevents deterioration of display characteristics due to temperature fluctuations without impairing display functions.

[Summary of the invention]

In the present invention, a liquid crystal cell is divided into a first cell chamber that includes a display section and a second cell chamber that does not include a display section. There is an empty space in the chamber that is not filled with liquid crystal, and a cell chamber for the first cell and a second cell chamber.
The 0 cell chambers are connected by a low conductance connecting passageway that allows movement of liquid crystal.

With this configuration, the volume expansion of the liquid crystal due to one temperature rise is the third dragon! ! Since it can be partially absorbed, deterioration of display characteristics due to temperature fluctuations is reliably prevented. The first cell chamber in which the display section is located and the second cell chamber in which the gap remains are connected by a low-conductance connecting passage, which prevents the display section and the gap from overlapping each other. It does not impair the display function.

[Invention 1! Example] FIGS. 1(a) to (C) show a liquid crystal cell of one example. (a) Senryo diagram on the Fi display surface side, (b) is the Senryo diagram with the transparent electrode substrate on the display surface side peeled off, and (C)
(a) is a cross-sectional view taken along OA-A'. The liquid crystal cell holds the GHII liquid crystal 12 between two transparent electrode substrates JJttJJl, and the periphery is sealed with a sealing material 1j, and this basic configuration is unchanged from the conventional one. This example shows a speedometer display cell, in which a transparent electrode film (not shown in the figure) is formed on the entire inner surface m of one transparent electrode substrate 11, and the other transparent electrode substrate 11. In the figure, a pergraph display section 1 indicated by a broken line is formed by a transparent electrode film that has been turned.
41, a numeric display section 143 is formed.

The liquid crystal cell has a first cell chamber A containing the display section '41 * 141 and a second cell chamber B1 . B3
The first cell chamber A and the second cell chamber B1. Between B1, a low conductance connecting passage 151.15° is provided in which the liquid crystal can move. In this embodiment, the first cell chamber A and the second cell chamber B1+
The separation wall of B and the passage wall of the connecting passage '51+1152 are integrally formed with the sealing material 13. LCD 12
The first cell chamber A is completely filled and the second cell chamber B is completely filled.
, IB, leave a void that is not filled with 5 liquid crystals. A mask 16 is coated on the surface of the transparent electrode substrate 1110 so as to cover the area other than the first cell chamber A which is the display section. Mask 16Fi, for example, can be formed by overlapping or pasting thick paper inside a black resin sheet, or by directly applying 6 or black Vein F *IWu, liquid crystal OvE entrance, and sealing after injection. This is the part where it is done.

The manufacturing of this liquid crystal cell and the liquid crystal O filling work are as follows.
This can be done through. First, transparent electrode substrate 1
After applying liquid crystal alignment treatment to the space between 1** and 1**jJ*o@, both substrates 11. are made to face each other with the electrode sides facing each other, and are coated and printed on at least one of the substrates in advance, and then a sealing material 13 is applied to both substrates 11. .

11 cells are glued together to form a 10th cell chamber Ah- and a second cell chamber J+B1. At that time, a part of the sealing material IJ is cut out to provide an injection port 11 for filling the liquid crystal. Next, the entire % liquid crystal cell is placed in a vacuum container, and the air inside the liquid crystal cell is exhausted to evacuate each chamber. Next, while holding the vacuum tube inside the liquid crystal cell, liquid crystal is applied to cover the injection port 11. Generally, the liquid crystal material used in these display cells has a higher viscosity than liquids such as water, so it is necessary to apply the material in an amount equivalent to the internal volume of the liquid crystal cell. In reality, you can apply liquid crystal with a cell content IU 2 times 11 degrees, or you can immerse it in a container with a liquid crystal reservoir with the injection port 11 facing downward in a vacuum chamber, and cover the injection port 11 with liquid crystal. .

Next, by taking the liquid crystal cell out of the vacuum capacity or increasing the internal pressure of the vacuum container, the liquid crystal is gradually removed.
flow into the first cell chamber A, first the first cell chamber A;
to fill up. This flow into the second cell chamber BSeB snow flows into the connecting passage 151. between this and the first cell chamber A.
1B is a narrow passageway, and the conductance of the ninth cell flowing through it is low, so that it first empties after the first cell chamber A is filled. Second cell room Bl+! Injection of liquid crystal into 1 g is shown in Figure 1 (
As shown in b), the tip of the liquid crystal 12 is connected to the connecting passage 151.
Stop m1h when it reaches the end. and,
Wipe off the liquid crystal applied to the outside of the injection port 11 with a cloth, etc.
Immediately, a quick-drying sealant is applied to the outside of the injection port 11, and a small amount of this is introduced into the cell to close the injection port 1r. As a result, the second cell i! ! A void is left in B1+B*.

In a good liquid crystal cell configured in this way, even if there are fluctuations in the environmental temperature, the volume expansion and contraction of the liquid crystal 120 will be the same as in the 10th cell*J.
e 110 It is absorbed by the air, and the thickness does not change due to IF. Generally, the volumetric thermal coefficient of liquid crystal is approximately I
1G-''/C, which is extremely large compared to the volume expansion coefficient of about 1X10-'/C of a transparent electrode substrate made of glass material.

Therefore, as mentioned above, if the temperature continues to rise to about 85°C for a long time, if the liquid crystal is completely filled, the display characteristics will change due to irreversible thickness fluctuations in the liquid crystal cell O. As a result, the operating temperature range is limited to -5℃ to 55℃ and 11 degrees.In contrast, according to this It appears that it can be used without causing any deterioration. Since the first cell chamber containing the display section and the third cell chamber having the void are connected by a low-conductance connecting passage, the void is always connected to the inside of the cell with a double-layered structure. The condition is maintained, and the situation where the gap overlaps with the display section and impairs the display function is prevented.

No. 21i shows a plan view corresponding to No. 111(b) of an OS crystal cell according to another embodiment of the present invention. Parts corresponding to those in FIG. 1 are given the same reference numerals as No. tg. A detailed explanation is omitted, but in this embodiment, the second cell chamber B1 is directly connected to the liquid crystal injection port 11, and the liquid crystal 11 is directly connected to the liquid crystal injection port 17.
From second cell 1ill B t→th! The cell mA is filled along the route from cell mA to second cell Murojima. As shown in this gold map, the first. Fill the cell chamber with liquid crystal 11,
Second cell room B1*B! To leave an empty part in , do the following: First, inject water from the injection port 17 to fill the second cell chamber B1, and then fill the first cell chamber A to about 90%, leaving one part of the remaining cell chamber A. part and −2 of the secfiy chamber B, (D volume is finally the second
cell chambers B1 and B.

Make sure that the total volume of the voids to be left is *L. After stopping the liquid crystal injection from the injection port 11 and wiping off the remaining liquid crystal near the injection port 11, low-pressure inert gas is injected to push the liquid crystal inside to obtain the state shown in the figure. - This embodiment provides the same effects as the fourth embodiment.

In addition, in the above 0 electricity embodiment, if there are two cases of red on the jO-th, there is an eclipse, and it is sufficient that there is at least one electricity.

[Invention O effect]

According to the present invention, the volumetric expansion and contraction of the liquid crystal caused by temperature fluctuations is effectively collected inside the liquid crystal cell, so that the first cell chamber that meets the display area due to the thickness unevenness K of the p1 liquid crystal cell. A low humemectance O is passed between the eighth cell chamber having a void.
Since they are connected by a connecting passage, the sky IIw always reverberates inside the first cell chamber, which contributes to the display function.It does not enter the first cell chamber, and the display function is not impaired. .

[Brief explanation of the drawing]

Figure 1 (1) to (,) show a liquid crystal cell according to an embodiment of the present invention, (&) is a plan view, (b) is a cross-sectional view of the upper electrode base, and the second figure is an example of a liquid crystal cell according to an embodiment of the present invention. Figure 1 (b) of the liquid crystal cell of
K corresponds to 1,000wm. 'l1ell Yu...transparent electrode substrate, 12...liquid crystal,
JJ-・Sealing material, 141*14@-・Display part, 11
J1*18B・Series connection path, 16-・Mask, 11・・
- Inlet 1A... 1st) cell chamber, 111.1. ...
Third cell room.

Claims (3)

[Claims] (1) In a liquid crystal display device using a liquid crystal cell formed by holding liquid crystal between transparent electrode substrates and sealing the periphery, the liquid crystal cell includes a first cell chamber containing a display section and a display section. The second cell chamber is divided into an eighth cell chamber, and the second cell chamber is provided with a void portion that is not filled with liquid crystal. A liquid crystal display device characterized by having a conductance connecting passage. (2) The liquid crystal display according to claim 1, wherein the separation wall between the cell chamber III and the second cell chamber and the passage wall of the connecting passage are integrally formed with a sealing material that seals the periphery of the liquid crystal cell. Display device. (3) The liquid crystal display device according to claim 1, wherein the il crystal cell is a dust/host lid, and has a mask on its surface with a window corresponding to the first cell chamber.