JP2000338516A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent damages in a sealing material and a liquid crystal in a connecting process to a heater, to display good images without an irregularity in the display and to obtain a fast response rate even in a low temp. environment by connecting an electrode terminal at the outside position from the position where the sealing material for a display cell and an interference cell is formed. SOLUTION: A heater 37 consisting of a transparent material to heat an interference cell 31 and a display cell 21 is formed all over the outside face of the interference side front glass plate 32 of an interference cell 31. Electrode terminals 38 to apply a voltage to the heater are connected to the both end parts in the longitudinal direction of the heater 37. Since the longitudinal dimensions of the interference side front glass plate 32 and the heater 37 formed all over the surface of the interference side front glass plate 32 are larger than the dimensions of the sealing materials 26, 34 for the display cell 21 and the interference cell 31, the electrode terminals 38 connected to both ends of the heater 37 are connected in the position in the outside along the longitudinal direction from the sealing materials 26 and 34 of the display cell 21 and the interference cell 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly to a two-layer liquid crystal display having a heater made of a transparent material.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal display device having a display cell in which liquid crystal is sealed between two panel substrates, the response speed of display tends to be slow because the viscosity of the liquid crystal increases in a low temperature environment. is there. For this reason, there has been a particular problem when the device is used even at a low temperature, such as in a vehicle. In recent years, the duty ratio of liquid crystal has also increased,
Depending on driving conditions, the response speed tends to be further reduced. Therefore, high reliability is required for a liquid crystal display device for a vehicle or the like, and in the field of a liquid crystal display device having a high duty, a viewpoint of enabling high contrast liquid crystal display and a wide temperature range From the viewpoint of adapting to liquid crystal display, a two-layer STN type liquid crystal display device including a display cell and an interference cell as an optical compensator has been used.

Further, conventionally, in order to increase the response speed of the liquid crystal display device in a low temperature environment, a method of heating the display panel of the two-layer type liquid crystal display device with a heater has been adopted. In such a case, in order to sufficiently warm both the display cell and the interference cell of the liquid crystal display device, it is effective to provide a heater between the display cell and the interference cell. However, in the case of a commercially available heater in which a transparent electrode is formed on a transparent film, since the base film has a refractive index anisotropy, disposing the commercially available heater between the display cell and the interference cell adversely affects contrast. Will be given.

Accordingly, the heater is not separately provided between the display panel and the interference panel.
It is effective to form a transparent material made of indium oxide directly on the outer surface of one of the panel substrates of the display cell and the interference cell facing each other and use it as a heater. In this case, since a transparent electrode made of indium oxide or the like for a display pattern is formed on the inner surface of the display cell panel substrate, the display cell-side panel substrate (hereinafter, referred to as a display-side panel substrate) is formed. When the transparent material for the heater is formed on the outer surface of the display cell, the transparent electrode and the transparent material are formed on the outer surface and the inner surface of the panel substrate of the display cell, and handling becomes difficult.

Therefore, conventionally, as the two-layer type STN type liquid crystal display device, as shown in FIG. 4, a panel substrate facing the display cell of the interference cell (hereinafter referred to as an interference side panel substrate). There is used a liquid crystal display device 1 in which the transparent material is formed on the outer surface of the liquid crystal and used as a heater.

That is, the liquid crystal display device 1 has a display cell 2, and the display cell 2 faces the display side front glass plate 3 as a display side panel substrate and the display side front glass plate 3. Display side rear glass plate 4
have. One of the glass plates (display-side rear glass plate 4) is formed to be at least longer in the longitudinal direction than the other glass plate (the display-side front glass plate 3). On the inner surfaces of the display-side front glass plate 3 and the display-side rear glass plate 4 facing each other, display transparent electrodes 5 as electrodes are formed in stripes. The display-side front glass plate 3 and the display-side rear glass plate 4 are bonded to each other via a frame-shaped sealing material 7 while maintaining a predetermined gap. Is display cell 2
Of the liquid crystal display area. The liquid crystal 6 is sealed in the gap. Further, a polarizing plate 8 is provided on an outer surface of the display-side front glass plate 3.

Further, the liquid crystal display device 1 has an interference cell 9 as an optical compensator at a position facing the display cell 2.
have. The interference cell 9 has an interference-side front glass plate 10 as an interference-side panel substrate and an interference-side rear glass plate 11 formed in the same size as the interference-side front glass plate 10. The interference-side front glass plate 10 and the interference-side rear glass plate 11 are adhered to each other via a frame-shaped sealing material 12 while maintaining a predetermined gap, and a liquid crystal 13 is sealed in the gap. A polarizing plate 1 is provided on the outer surface of the interference-side rear glass 11.
4 are provided.

A heater 16 made of a transparent material such as indium oxide for heating the interference cell 9 and the display cell 2 is formed on the outer surface of the interference side windshield 10 of the interference cell 9. . The heater 16
Electrode terminals 17 for applying a voltage to the heater 16 are formed at both ends in the longitudinal direction of the surface.

By using the two-layer liquid crystal display device 1 provided with such a heater 16, it is said that a good liquid crystal display with a quick response speed and no display unevenness can be obtained even in a low temperature environment. .

[0010]

In the conventional liquid crystal display device, as shown in FIG. 4, the electrode terminal 17 of the interference cell 9 is connected to the sealing material 7 of the display cell 2 and the interference cell 9. , 12. Generally, when the electrode terminal 17 is connected to the heater 16, thermocompression bonding using an anisotropic conductive film or UV
A connection method using an anisotropic resin is used. For this reason, if the electrode terminal 16 is formed at a position facing the sealing members 7 and 12, the heater 16 of the electrode terminal 17
At the time of connection, the sealing material 12 of the interference cell 9 may be damaged by heat or pressure. In order to solve this, it is conceivable to make the sealing material 12 thicker or to loosen the thermocompression bonding conditions. In these cases, however, the liquid crystal display area of the display cell 2 becomes narrower, or However, since the adhesive strength between the heater 16 and the electrode terminal 17 is weakened, the problem cannot be effectively solved. Further, in the connection method using a UV anisotropic resin, the liquid crystal 6 of the interference cell may be deteriorated by ultraviolet rays.

As a result, uneven display occurs, and the liquid crystal display device 1 cannot perform a satisfactory liquid crystal display.

Further, in order to sufficiently warm the display cell 2 by the heater 16, the display cell 2 is
It is desirable to install as close as possible to the 6 side,
Since the electrode terminals 17 of the heater 16 are located immediately below the sealing material 7 of the display cell 2, when a forced force is applied, color unevenness such as gap unevenness may occur in the liquid crystal display areas of the display cell 2 and the interference cell 9. there were.

The present invention has been made in view of such a problem, and provides a good liquid crystal display without display unevenness without damaging the sealing material of the interference cell and the liquid crystal when connecting the terminal electrode to the heater. It is an object of the present invention to provide a liquid crystal display device that can perform a quick response speed even in a low-temperature environment.

[0014]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: an electrode terminal disposed outside a position where a sealant of the display cell and the interference cell is formed; It is at the point connected to the position.

By adopting such a configuration, it is possible to prevent the sealing material and the liquid crystal from being damaged when the electrode terminals are connected to the heater made of a transparent material. No good liquid crystal display can be performed, and the display cell can be installed as close as possible to the heater side.

A feature of the liquid crystal display device according to the second aspect is that, in the first aspect, the electrode terminals of the heater are formed using a flexible substrate.

[0017] By adopting such a configuration, a compact design can be realized.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a liquid crystal display device according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the liquid crystal display device 20 according to the present embodiment has a display cell 21 formed by the STN method, and the display cell 21 is a display front panel as a display panel substrate. It is composed of a glass plate 22 and a display-side rear glass plate 23. this house,
The display-side rear glass plate 23 is formed to be at least larger in the longitudinal direction that is the horizontal direction in FIG. 1 than the display-side front glass plate 22. Further, display transparent electrodes 25 as electrodes are formed on inner surfaces of the display side front glass plate 22 and the display side rear glass 23 facing each other. Further, the display-side front glass plate 22 and the display-side rear glass plate 23 are bonded to each other via a frame-shaped seal member 26 while maintaining a predetermined gap. It is a liquid crystal display area by the display cell 21. A liquid crystal 27 is sealed in the gap.
In addition, on the outer surface of the display-side front glass plate 22,
A polarizing plate 29 is provided.

Further, the liquid crystal display device 20 according to the present embodiment has an interference cell 31 formed by the STN method at a position facing the display cell 21. The interference cell 31 has an interference side front glass plate 32 and an interference side rear glass plate 33 as interference side panel substrates. The interference-side front glass plate 32 is formed to be at least longer in the longitudinal direction than the interference-side rear glass plate 33. Further, the interference-side front glass plate 32 is formed to be at least longer in the longitudinal direction than the display-side front glass plate 22 and the display-side rear glass plate 23 of the display cell 21. The interference side front glass plate 32 and the interference side rear glass plate 33 are sealed with a sealing material 34 while maintaining a predetermined gap.
The liquid crystal 35 is sealed in the gap. A polarizing plate 36 is provided on the outer surface of the interference-side rear glass plate 33.

As shown in FIGS. 1 and 2, a transparent material such as indium oxide for heating the interference cell 31 and the display cell 21 is provided on the outer surface of the interference side windshield 32 of the interference cell 31. Heater 3 made of material
7 is formed over the entire surface. Further, the heater 37
An electrode terminal 38 for applying a voltage to the heater 37 is connected to both ends in the longitudinal direction of the heater 37. The electrode terminal 38 is formed using a flexible substrate.

The interference side windshield plate 32
In addition, at least the longitudinal dimension of the heater 37 formed on the entire surface of the interference-side front glass plate 32 is larger than the dimensions of the seal members 26 and 34 of the display cell 21 and the interference cell 31. For,
The electrode terminals 38 connected to both ends in the longitudinal direction of the heater 37 are connected to the display cell 21 and the interference cell 31.
Is connected to a position outside the sealing members 26 and 34 in the longitudinal direction.

Accordingly, since the connection position of the electrode terminal 17 is not at the position facing the seal members 7 and 12 as in the conventional case, when the electrode terminal 38 is connected to the heater 37, the seal member 34 is heated or pressurized. Will not be damaged.
Further, even when the connection method using the UV anisotropic resin is adopted, the liquid crystal 35 inside the cell does not deteriorate.

In addition, when the electrode terminals 38 are connected, the sealing member 26 and the liquid crystal 27 of the display cell 21 are hardly affected. Therefore, the liquid crystal display cell 21 is installed closer to the heater 37 than before. You can do it. Further, since the electrode terminal 38 is not located at a position corresponding to the display side rear glass plate 23, the display side rear glass plate 23 can be brought into contact with the surface of the heater 37.

Next, the liquid crystal display device 2 of the present embodiment
The operation of 0 will be described.

First, the liquid crystal display device 2 of the present embodiment
In order to manufacture 0, the display cell 21 is manufactured by a known manufacturing method, and the interference cell 31 is manufactured by a known manufacturing method. At this time, the electrode terminal 38 is not connected to the heater 37.

Next, electrode terminals 38 formed using a flexible substrate are provided at both ends in the longitudinal direction of the heater 37.
Are connected by thermocompression bonding using an anisotropic conductive film or a connection method using a UV anisotropic resin.

At this time, the longitudinal dimensions of the heater 37 and the interference side front glass plate 32 are determined by the electrode terminals 38.
The display-side rear glass plate 2 located below these heaters 37 and the interference-side front glass plate 32 when
3, the display-side rear glass plate 23 cannot function as a scaffold when connecting the terminal electrode 38 to the heater 37, and the connection of the terminal electrode 38 is unstable. Or glass breakage may occur in some cases.

For this reason, the connection of the electrode terminals 38 is performed by installing a dummy glass equivalent to a glass plate as a scaffold when installing the electrode terminals 38 in a connection device (not shown).

At this time, since the connection position of the electrode terminal 38 is located outside the position where the seal member 34 of the interference cell 31 is formed in the longitudinal direction, the seal member 34 is not damaged by heat or pressure. Further, the liquid crystal 35 sealed inside the sealing material 34 in the longitudinal direction does not deteriorate.

Next, the interference cell 31 is installed below the display cell 21 such that the heater 37 of the interference cell 31 faces the display-side rear glass plate 23. At this time, since the electrode terminals 38 are located outside (in the longitudinal direction) of the display-side rear glass plate 23, the display-side front glass plate 22 of the display cell 21 can be placed in contact with the heater 37.

Therefore, according to the liquid crystal display device 20 of the present embodiment, the seal member 34 of the interference cell 31 is not damaged by heat or pressure when the electrode terminal 38 is connected to the heater 37. Since the liquid crystal 35 is not deteriorated, it is possible to perform good liquid crystal display without display unevenness while maintaining the same liquid crystal display area as that of the related art.
Also, the display cell 21 and the interference cell 31 are set to ST
Since it is formed by the N method, high-contrast liquid crystal display can be performed.

Further, the display cell 21 is connected to the heater 3
7 can be installed as close as possible to
The heater 37 can sufficiently warm the display cell 21 even in a low temperature environment, and the liquid crystal display device 20 can exhibit a quick response speed even in a low temperature environment.

Further, since the electrode terminals 38 of the heater 37 are formed using a flexible substrate having flexibility, a compact design can be achieved.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified as needed.

For example, in the present embodiment, as shown in FIG. 1, at least the longitudinal dimension of the interference side front glass plate 32 and the heater 37 formed on the interference side front glass plate 32 is equal to the display size. Although it is formed to be larger than the size of the side rear glass plate 23, it is not limited to this. For example, as shown in FIG. 3, the interference side front glass plate 32 and the heater 37 and the display side rear glass plate 23 The longitudinal dimension may be formed to the same size. In such a case, the connection position of the electrode terminal 38 is located outside the seal material forming position of the display cell 21 and the interference cell 31 in the longitudinal direction. can do.

[0037]

As described above, according to the liquid crystal display device of the first aspect of the present invention, good liquid crystal display without display unevenness can be performed, and good response speed can be obtained even in a low temperature environment. Can be demonstrated.

According to the liquid crystal display device of the second aspect, in addition to the effect of the liquid crystal display device of the first aspect, a compact design can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a plan view showing a heater and electrode terminals in the embodiment of the liquid crystal display device according to the present invention.

FIG. 3 is a sectional view showing another embodiment of FIG. 1 in the embodiment of the liquid crystal display device according to the present invention.

FIG. 4 is a sectional view showing a conventionally used two-layer liquid crystal display device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 liquid crystal display device 21 display cell 22 display-side front glass plate 23 display-side rear glass plate 25 display transparent electrode 26 sealing material 27 liquid crystal 31 interference cell 32 interference-side front glass plate 33 interference-side rear glass plate 37 heater 38 electrode terminal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/30 330 G09F 9/30 330Z 9/35 307 9/35 307 F term (reference) 2H089 HA25 LA41 QA16 TA01 TA06 2H092 GA50 GA63 HA03 HA26 HA27 NA01 NA05 NA17 PA01 PA04 QA10 5C094 AA03 AA13 AA43 AA48 BA43 DA03 DA12 DB10 EA05 EA10 EB02 FA01 FA02 5G435 AA01 AA12 AA14 AA16 AA18 BB12 DD11 FF01 GG05 H11 GG01 H

Claims (2)

[Claims] In a state in which transparent electrodes for display are formed on respective inner side surfaces of two display-side panel substrates which face each other, these two display-side panel substrates are formed.
The two display-side panel substrates are bonded via a sealing material while maintaining a predetermined gap, and a display cell in which liquid crystal is sealed is provided in the gap, and at a position facing the display cell,
The two interference-side panel substrates are bonded via a sealing material while maintaining a predetermined gap, and an interference cell in which liquid crystal is sealed is provided in the predetermined gap, and the interference-side panel substrate facing the display cell is provided outside the interference-side panel substrate. In a two-layer liquid crystal display device in which a heater made of a transparent material is formed on the side surface and electrode terminals for applying a voltage to the heater are connected to both ends of the heater, the electrode terminals of the heater are A liquid crystal display device, wherein the liquid crystal display device is connected to a position outside a position where a sealant of the display cell and the interference cell is formed. 2. The liquid crystal display device according to claim 1, wherein the electrode terminals of the heater are formed using a flexible substrate.