JPH10293319A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the capacity and the area of the connected part (mounted part) of a liquid crystal display device and a drive circuit by jointing a connection terminal to the electrode of the first substrate or the second substrate via a conductive materiel, and then forming a reflective layer on a drive circuit substrate to reflect light for transmission through the first or the second substrate. SOLUTION: Orientation films 11 for orienting a liquid crystal layer 12 are formed on the first substrate 1, the first electrode 3, the second substrate 2 and the second electrode 10. Also, the first substrate 1 and the second substrate 2 are pasted to each other via a prescribed gap at a seal part 13, so as to seal the liquid crystal layer 12. Furthermore, a drive circuit substrate 6 is laid on the back of the first substrate 1, with the surface of an integrated circuit kept faced to the opposite side of the first substrate 1, and pasted by use of an epoxy resin adhesive 9. In addition, a semi-circular recess 5 is formed on the side wall of the first substrate 1. Thereafter a liquid crystal display panel is connected to a dive circuit substrate connection part 8 to be jointed to a connection terminal 7 on the circuit forming surface of the drive circuit substrate 6 with conductive paste at liquid crystal display panel connection part 4 on the outer side of the seal part 13 of the first electrode 3 on the first substrate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a liquid crystal display device, which requires a connection between a drive circuit board and an electrode for driving a liquid crystal, does not require a switching element, has a simple matrix type, or has a switching element. The present invention relates to an active matrix type liquid crystal display device. Further, a reflective liquid crystal display device that performs display using an external light source, or a transflective liquid crystal display device having illumination that is turned on according to the intensity of the external light source, or a reflective liquid crystal display panel and a transmissive liquid crystal display The present invention relates to a composite liquid crystal display device using a panel together. Further, the present invention relates to a configuration for connecting a driving circuit board to an electrode on a first substrate or a second substrate and a mutual effective structure between the first substrate or the second substrate and the driving circuit board.

[0002]

2. Description of the Related Art In recent years, the range of use of a liquid crystal display device using a liquid crystal panel has been expanded, and the portability, the thinness, and the ratio of the display area to the area of the first substrate or the second substrate have been improved. ing. The structure of the liquid crystal display device includes a passive matrix type in which a display electrode of a liquid crystal pixel is directly connected to a first electrode provided on a first substrate, and an active device having a switching element between the first electrode and the display electrode. There is a matrix type. Further, a counter electrode is provided via a liquid crystal so as to face the display electrode on the first substrate, and the plurality of first electrodes and the plurality of counter electrodes are arranged in a matrix. And a structure in which a predetermined signal is applied from a drive circuit to a second electrode connected to the second electrode.

[0003] In a unit using multiplex driving in a liquid crystal display device having a simple matrix configuration (passive matrix type), the contrast or the response speed decreases as time division is increased, but about 200 scanning lines are required. , A sufficient contrast can be obtained.

In order to further increase the number of scanning lines or to improve the contrast and the response speed, an active matrix liquid crystal display panel in which switching elements are provided for individual pixels is employed.

The active matrix liquid crystal display panel is roughly classified into a three-terminal switching element using a thin film transistor and a two-terminal switching element using a non-linear resistance element. Of these, the structure and manufacturing method are simple and relatively low-temperature
Two-terminal switching elements are excellent.

[0006] As this two-terminal switching element,
Diode type, varistor type, TFD type and the like have been developed.

[0007] Among them, the TFD type has a feature that the structure is particularly simple and the manufacturing process is short.

Further, since the liquid crystal display device is not a self-luminous display device, an external light source is used to perform display by utilizing a change in external light by an optical change of the liquid crystal. Therefore, the positional relationship between the observer, the liquid crystal display device, and the light source is roughly classified into two types. The first is a so-called reflective liquid crystal display device in which the light source and the observer are on the same plane with respect to the liquid crystal display device. The second is a so-called transmission type liquid crystal display device in which an observer-liquid crystal display device-light source is arranged. It is a liquid crystal display device. For the purpose of reducing power consumption, which is an advantage of a liquid crystal display device, a reflective liquid crystal display device that uses a light source around the liquid crystal display device without a light source is effective.

The method for connecting the first circuit board or the second circuit board (hereinafter simply referred to as a circuit board for convenience) and the drive circuit board are the board and the drive circuit board. A chip-on-glass (COG) method in which a single crystal silicon substrate is connected to a substrate. A method using a flexible printed circuit (FPC) for forming a conductive wiring on a resin, for example, between a substrate and a drive circuit substrate.
Alternatively, there is a method utilizing anisotropic conductive rubber.

The connection method between the electrodes and the drive circuit board on the board is variously used depending on the size of the board, the length of the display area for actually displaying the liquid crystal, and the length of the board to the outer shape.
However, in the case where the conventional mounting method is used, the area of the mounting portion becomes large. Therefore, particularly when applied to a small information device, there is a problem in the ratio indicated by the display area of the liquid crystal display device.

In particular, in the case of a passive matrix type which does not use a switching element, a two-terminal type active matrix type, or a three-terminal type active matrix type having an intermediate performance, a semiconductor device for driving a liquid crystal, For example, it is necessary to mount a drive circuit unit composed of an integrated circuit, and it is important to reduce the mounting area.

Further, in the conventional structure, since the drive circuit section is not used as a reflector or as a light source, an increase in the overall size, that is, an adverse effect on miniaturization is caused. .

[0013]

Here, in a conventional liquid crystal display device having a drive circuit section, the drive circuit drive sections are divided into a plurality of sections and connected to each other. As a result, the ratio of the display area to the substrate in a small portable device was reduced.

Further, since the liquid crystal does not emit light by itself, there are a reflective type using external light and a transmissive type in which the liquid crystal display has an illuminating means. For low power consumption, the reflective type liquid crystal display is effective. is there. Further, in the conventional method, it is necessary to provide a reflector or an illumination unit in addition to the drive circuit unit. For this reason, the volume and the weight have been increased.

Further, connection with the drive circuit becomes complicated,
A problem arises in the capacity of the portion connecting the drive circuit and the liquid crystal display device. Particularly, in the case of a small liquid crystal display device, the display area is reduced or the display performance is deteriorated. Further, in the case of an arm information device to be put on an arm, the size of the whole is more severely required, and reduction and improvement of the volume and area of the mounting portion are required.

An object of the present invention is to solve the above problems and to improve the method of connecting a liquid crystal display device to a drive circuit, and to connect the liquid crystal display device to the drive circuit by using the drive circuit as a reflector (mounting unit). An object of the present invention is to provide a structure of a liquid crystal display device for forming a liquid crystal display device having good display quality by reducing the volume and area of the liquid crystal display device.

[0017]

In order to achieve the above object, the liquid crystal display of the present invention employs the following configuration.

According to the liquid crystal display device of the present invention, a first substrate and a second substrate opposed to each other at a predetermined interval, and
A first electrode provided on a second substrate, a second electrode provided on a second substrate, a liquid crystal between the first substrate and the second substrate, In a liquid crystal display device for applying a signal to the second electrode and performing display by optical change of the liquid crystal, a driving circuit provided on a driving circuit substrate for applying a signal to the first electrode or the second electrode and connected to the driving circuit Connection terminal, and the connection terminal and the first electrode or the second electrode.
Are connected via at least a conductive material provided on a side wall of the first substrate or the second substrate, and a part of the driving circuit is disposed on a back surface of the first substrate or the second substrate. Further, a reflective layer is provided on the drive circuit substrate, the reflective layer reflecting light transmitted through the first substrate or the second substrate.

According to the liquid crystal display device of the present invention, a first substrate and a second substrate opposed to each other at a predetermined interval, and
A first electrode provided on a second substrate, a second electrode provided on a second substrate, a liquid crystal between the first substrate and the second substrate, A connection terminal on a drive circuit board having a drive circuit for applying a signal to the first electrode or the second electrode in a liquid crystal display device which applies a signal to the second electrode and performs display by optical change of the liquid crystal. And the first electrode or the second electrode, at least the first electrode
Through a through hole that penetrates the first substrate or the second substrate, furthermore, a part of the driving circuit is disposed on the back surface of the first substrate or the second substrate. It has a reflective layer for reflecting light transmitted through the first substrate or the second substrate.

The liquid crystal display device of the present invention comprises a first substrate and a second substrate facing each other at a predetermined interval, and
A first electrode provided on the first substrate and a second electrode provided on the second substrate, a liquid crystal between the first substrate and the second substrate, and a first electrode provided on the second substrate. And a connection terminal on a drive circuit board having a drive circuit for applying a signal to the first electrode or the second electrode in a liquid crystal display device which applies a signal to the electrodes and performs display by optical change of the liquid crystal. The first electrode or the second electrode is at least the first electrode or the second electrode.
A driving circuit board connected to a side wall of the second substrate or the second substrate or through a through hole, and a driving circuit board disposed on a back surface of the first substrate or the second substrate; A photovoltaic element is arranged around each display pixel for applying a voltage to the liquid crystal layer.

According to the liquid crystal display device of the present invention, a first substrate and a second substrate facing each other at a predetermined interval, and
A first electrode provided on the first substrate and a second electrode provided on the second substrate, a liquid crystal between the first substrate and the second substrate, and a first electrode provided on the second substrate. In a liquid crystal display device that performs display by applying a signal to an electrode of the liquid crystal and performs optical display of the liquid crystal, the liquid crystal display device includes a transmissive region for visualizing display by a light source disposed on the back surface, a reflective layer disposed on the back surface, and external light. And at least two areas, a reflection area for visualizing a display, and the driving circuit board is arranged on the back surface of the first substrate or the second substrate in the reflection area, and the reflection is provided on the front surface of the driving circuit board. Drive circuit board having a layer, a drive circuit board and a first substrate or a second substrate adhered to each other and having a drive circuit for applying a signal to the first electrode or the second electrode The upper connection terminal and the first electrode or the second electrode At least the side wall of the first or second substrate, or, characterized in that connected through the through hole.

The liquid crystal display device of the present invention is characterized in that it has a two-terminal switching element connected to an electrode on the first substrate or the second substrate, or a three-terminal switching element.

(Operation) In a liquid crystal display device in which a drive circuit is connected to the liquid crystal display panel to apply a predetermined voltage to the liquid crystal to perform a desired display, a connection method between the liquid crystal display panel and the drive circuit board is very important. Therefore, the liquid crystal display device of the present invention performs the connection between the driving electrode of the liquid crystal display panel and the connection terminal provided on the driving circuit (integrated circuit) substrate through the side wall portion of the liquid crystal display panel, and Stability and reduction of connection capacity. At this time, a depression is formed in the side wall of the liquid crystal display panel at a position corresponding to each electrode to stabilize the connection. Thereby, it is possible to reduce the resistance and stabilize the connection.

Further, a through hole is provided in the substrate of the liquid crystal display panel, and the surface of the through hole is connected via a material whose surface is covered with a conductor or a material in which the through hole is filled with a conductor. The portion for connecting the drive circuit board can be reduced. Further, since the connection of the drive circuit board to a board far from the drive circuit of the board constituting the liquid crystal display panel through the through hole can be made, the mounting portion can be extremely reduced.

Further, a substrate having insufficient rigidity such as a plastic substrate is bonded to a driving circuit, and the strength of the liquid crystal display panel can be reinforced by the driving circuit substrate. In addition, by forming a reflective layer on the front or back surface of the drive circuit board or a concave and convex layer and a reflective layer to form a reflective layer of a reflective liquid crystal display device, the volume of the completed reflective liquid crystal display panel can be made smaller than before. it can.

Further, a portion constituting the liquid crystal display panel is constituted by a transmissive or semi-transmissive display portion and a reflective display portion, and a drive circuit board is disposed on the back surface of the reflective portion of the substrate. , The mounting method is the side wall of the board or
By performing through the through hole of the substrate, transmission type,
Alternatively, the transflective display unit can be used more efficiently.

Further, a photovoltaic element is provided on a portion of the liquid crystal display panel that passes between display pixels on a drive circuit substrate adhered to the back surface of the first substrate or the second substrate. Accordingly, it is possible to generate and store electric power by the photovoltaic element while performing display. Therefore, it is very effective especially for a liquid crystal display device that consumes a large amount of power. Further, the photovoltaic element can improve display quality by preventing reflection between display pixels.

Further, since the liquid crystal display panel can be colored by utilizing the interference of the wiring pattern or film provided on the front surface or inside of the drive circuit substrate provided on the back surface of the liquid crystal display panel, the color display is simplified. Is effective.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a liquid crystal display device according to the best mode for carrying out the liquid crystal display device of the present invention will be described below with reference to the drawings.

First, the configuration of the liquid crystal display panel and the drive circuit board according to the first embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 1 is a plan view enlarging a part of the liquid crystal display device according to the first embodiment of the present invention. FIG.
FIG. 2 is a sectional view showing a section taken along line AA of the plan view of FIG. 1. Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2 alternately.

On a first substrate 1 made of a glass substrate,
A first electrode 3 made of an indium tin oxide (ITO) film is provided as a transparent conductive film. Further, a second substrate 2 facing the first substrate 1 is provided. On the second substrate 2,
It has a second electrode 10 that intersects with the first electrode 3 via the liquid crystal layer 12. On the first substrate 1, the first electrode 3, the second substrate 2, and the second electrode 10, an alignment film 11 for aligning the liquid crystal layer 12 is provided. In addition, the first substrate 1 and the second substrate 2 are bonded to each other with a predetermined gap at the seal portion 13 in order to enclose the liquid crystal layer 12. Thus, a liquid crystal display panel is configured.

Next, the surface of the integrated circuit of the drive circuit board 6 is arranged on the back surface of the first substrate 1 on the surface opposite to the first substrate 1 and bonded with an epoxy resin adhesive 9. Further, a semicircular recess 5 is provided in the side wall of the first substrate 1 as shown in FIG.

Next, at the liquid crystal display panel connection portion 4 outside the seal portion 13 of the first electrode 3 on the first substrate 1, the drive connected to the connection terminal 7 provided on the circuit forming surface of the drive circuit board 6 The circuit board connecting part 8 is connected using a conductive paste. In the method of forming the conductive paste, the pressing force of a conductive paste injection nozzle of a pressurizing type, for example, an ink jet nozzle of an ink jet printer is improved at regular intervals on the side wall of the first substrate 1. It was possible by using things. further,
The connection between the conductive paste, the liquid crystal display panel connection portion 4 and the drive circuit board connection portion 8 is stabilized by providing the depression 5 in the side wall portion of the first substrate 1 or further providing a taper above and below the depression. Further, an electrical short circuit with the adjacent electrode could be prevented.

By adopting the above configuration, as shown in FIG. 2, almost no volume is required for connecting the first electrode 3 to the drive circuit board 6. Furthermore, since the conductive paste is formed in the recess 5 provided on the side wall of the first substrate 1, the adhesion between the conductive paste and the first substrate 1 is improved, and the conductive paste is prevented from being peeled off by an external force. An electrical short circuit between adjacent electrodes can be prevented. For this reason, the capacity of the connection portion between the liquid crystal display panel and the drive circuit board has been reduced, and furthermore, a favorable connection in terms of strength has been made possible.

Next, the structure of the liquid crystal display panel and the driving circuit board according to the second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 3 is an enlarged plan view of a part of the liquid crystal display device according to the second embodiment of the present invention. FIG.
FIG. 4 is a sectional view showing a section taken along line BB of the plan view of FIG. 3. Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 3 and 4 alternately.

On a first substrate 1 made of a glass substrate,
A first electrode 3 made of an indium tin oxide (ITO) film is provided as a transparent conductive film. Further, a second substrate 2 facing the first substrate 1 is provided. On the second substrate 2,
It has a second electrode 10 that intersects with the first electrode 3 via the liquid crystal layer 12. On the first substrate 1, the first electrode 3, the second substrate 2, and the second electrode 10, an alignment film 11 for aligning the liquid crystal layer 12 is provided. In addition, the first substrate 1 and the second substrate 2 are bonded to each other with a predetermined gap at the seal portion 13 in order to enclose the liquid crystal layer 12. Thus, a liquid crystal display panel is configured.

Next, the integrated circuit on the drive circuit board 6 is arranged on the back surface of the first substrate 1 in a direction in contact with the first substrate 1 and bonded with an epoxy resin adhesive 9. Further, a through hole 14 is provided in a part of the first electrode 3 on the first substrate 1 and outside the seal portion 13. The method of forming the through holes 14 was formed this time using laser light. Although a honing technique in which fine particles are injected at high pressure is possible, laser processing was used because processing was possible in a short time. Further, the inside of the through hole 14 was made conductive by a method of embedding a conductor in the through hole of the first substrate 1 by electrophoresis or plating. Further, a conductor was formed to such an extent that it protruded from the surface of the first substrate 1.

Further, in order to use the drive circuit board 6 as a reflection layer, a reflection layer 15 is formed on the surface of the drive circuit board 6. The reflection layer 15 forms a step by the step of the wiring used for the drive circuit board 6 and the passivation film used conventionally, and aluminum (A) is formed on the passivation film.
l) A membrane was employed. Furthermore, by connecting the connection terminal 7 on the drive circuit board 6 and the conductor of the through hole 14, an electric signal generated in the drive circuit board 6 can be connected to the first electrode 3 via the through hole 14. Becomes No. 2
For example, a method in which a conductive spacer (not shown) is mixed into the seal portion 13 and the electrode is connected to the electrode on the first substrate 1 via the conductive spacer is adopted as the electrode. Thereby, the connection terminal 7 can be similarly connected through the through hole 14.

Further, a reflection layer provided on the drive circuit board 6
In the case of using a highly reflective material, for example, an aluminum film or a silver film, the moisture resistance is insufficient.
Is sandwiched between the substrate 1 and the drive circuit board 6, so that the reliability can be improved.

By employing the above configuration, as shown in FIG. 4, almost no volume is required for connecting the first electrode 3 to the drive circuit board 6. For this reason, the capacity of the connection portion between the liquid crystal display panel and the drive circuit board has been reduced, and furthermore, a favorable connection in terms of strength has been made possible. further,
By using a part of the drive circuit board 6 as the reflective layer 15, the volume of the drive circuit board 6 and the reflective layer 15 can be minimized, so that a complicated configuration can be provided in a very small volume. It has become possible.

Next, the structure of the liquid crystal display panel and the driving circuit board according to the third embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 5 is an enlarged plan view of a part of the liquid crystal display device according to the third embodiment of the present invention. FIG.
FIG. 6 is a sectional view showing a section taken along line CC of the plan view of FIG. 5. 5 and 6 show the first embodiment or
Unlike the second embodiment, the first electrode and the drive circuit board 6
The configuration of the connection portion with the is omitted. Also in the third embodiment, the connection method between the first electrode and the connection terminal on the drive circuit board is the same as in the first embodiment or the second embodiment. Hereinafter, the third embodiment of the present invention will be described with reference to FIGS. 5 and 6 alternately.

On a first substrate 1 made of a glass substrate,
An island-shaped lower electrode 30 made of a tantalum (Ta) film is provided. On the lower electrode 30, a tantalum oxide (Ta2O5) film 31 made of a tantalum anodic oxide film is provided. In addition,
In order to form an anodic oxide film on the lower electrode 30, each island-shaped lower electrode 30 is connected to an anodic oxidation electrode at the time of anodic oxidation, and is externally connected to each island-shaped lower electrode 30 via an anodized electrode. A voltage can be applied. When the anodization is completed, the anodizing electrode is removed from the first substrate 1.

Further, the anodic oxide film 31 on the lower electrode 30
And a first electrode upper electrode 32 and a display electrode upper electrode 33 overlapping with each other. The first electrode upper electrode 32 includes:
Connect to first electrode 3. Also, the upper electrode 3 for the display electrode
3 is connected to a display electrode 38 constituting each display pixel of the liquid crystal display device. That is, the first switching element 35 is formed by the lower electrode 30, the anodic oxide film 31 provided on the lower electrode 30, and the first electrode upper electrode 32.
Further, a second switching element 36 is formed by the lower electrode 30, the anodic oxide film 31 provided on the lower electrode 30, and the upper electrode 33 for the display electrode.

Further, a second substrate 2 is provided opposite to the first substrate 1 having the switching elements 35 and 36 described above. On the second substrate 2, each first substrate 1
The second electrode 1 is opposed to the display electrode 38 provided thereon.
0 is provided. On the first substrate 1 and the second substrate 2,
An alignment film 11 for aligning the liquid crystal layer 12 is provided. As described above, a liquid crystal display panel having the switching elements 35 and 36 can be configured. Display electrode 38 on first substrate 1
The intersection between the pixel and the second electrode 10 on the second substrate 2 facing each other via the liquid crystal layer 12 is a display pixel. The liquid crystal display mode utilizes a guest-host mode for performing gradation display by mixing a dichroic dye with liquid crystal, and does not particularly require a polarizing plate. Therefore, the drive circuit board 6 is connected to the switching element 3.
5 and 36 can be arranged on the back surface of the first substrate 1.

Further, on the back surface of the first substrate 1, a display electrode 38 is provided on the liquid crystal layer 12 of the liquid crystal display panel via the first electrode 29 and the switching elements 35 and 36, and the second substrate 2
A drive circuit board 6 having a drive circuit for applying a predetermined voltage to the upper second electrode 10 is arranged. On the surface of the drive circuit substrate 6 facing the first substrate 1, a photovoltaic element 37 provided in a region other than the display electrode 38, and a reflective layer 15 having irregularities on the surface provided in the region of the display electrode 38 are provided. . The drive circuit board 6 and the first board 1 are bonded together with a photocurable resin. In addition, the photovoltaic element 37 is partially connected (not shown) to the drive circuit of the drive circuit board 6, and accumulates electric charge in, for example, a lithium ion battery (storage battery).

In the third embodiment, the first
Although the connecting portion between the first substrate 1 and the driving circuit board 6 shown in the second embodiment or the second embodiment is not shown, the same method was used.

In particular, in a liquid crystal display panel having a switching element, the periphery of the display electrode 38 is a non-display area with respect to the liquid crystal layer 12. Therefore, it is difficult to prevent reflection by using a light shielding film. Is improved. Therefore, the photovoltaic element 37 provided on the drive circuit board 6 absorbs visible light, and thus can reduce the reflection of visible light. Further, the photovoltaic element 37 allows the accumulation of electric charge, which is effective when it is necessary to reduce the power consumption of a wristwatch or the like. Further, since an electrode made of a metal film is used on the lower surface of the photovoltaic element, malfunction of the drive circuit due to incidence of ultraviolet light or the like on the drive circuit can be prevented.

In the third embodiment, an example in which two two-terminal switching elements 35 and 36 are arranged between the first electrode 29 and the display electrode 38 has been described. Alternatively, a thin film transistor (TFT), which is a three-terminal switching element, may be used.

Next, the configuration of the liquid crystal display panel and the driving circuit board according to the fourth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 7 is an enlarged plan view of a part of the liquid crystal display device according to the fourth embodiment of the present invention. FIG.
FIG. 8 is a sectional view showing a section taken along line DD of the plan view of FIG. 7. Hereinafter, a fourth embodiment of the present invention will be described with reference to FIGS. 7 and 8 alternately.

On a first substrate 1 made of a thin glass substrate, indium tin oxide (ITO) is used as a transparent conductive film.
It has a first electrode 3 made of a film. Further, a second substrate 2 facing the first substrate 1 is provided. On the second substrate 2, there is provided a second electrode 10 that intersects the first electrode 3 via the liquid crystal layer 12. An alignment film 11 for aligning the liquid crystal layer 12 is provided on the first substrate 1 and the second substrate. Also, the first substrate 1 and the second substrate 2 are used to encapsulate the liquid crystal layer 12.
And are bonded together with a predetermined gap at the seal portion 13. Thus, a liquid crystal display panel is configured.

The liquid crystal display panel is divided into two blocks and has a reflection area 17 used as a reflection type and a transmission area 19 used as a transmission type or a semi-transmission type.
As shown in FIG. 7, the drive circuit board 6
A character display and a clock display are performed by a semiconductor memory area of an integrated circuit (not shown), a memory calling circuit, and a waveform generation circuit that applies a predetermined voltage to the liquid crystal layer 12 based on the contents of the memory. In addition, a reflective area 18 for displaying a date is provided. Is applied to perform character display, and at the same time, light is emitted by the illumination unit 29 to transmit information to the observer. In the transmissive region 19, a deflecting plate (not shown) may be arranged on both surfaces of the first substrate 1 and the second substrate 2, or a guest-host mode may be used.

Next, an integrated circuit for generating a signal for driving the liquid crystal display panel, connection terminals 7 connected to the integrated circuit, and a reflection area of the liquid crystal display panel are provided on a drive circuit board 6 facing the first substrate 1. And a reflective layer 15 located at The reflective layer has an unevenness made of a photosensitive resin and an aluminum (Al) film as a reflective film. Further, the first substrate 1
The electrode 3 and the connection terminal 7 provided on the drive circuit board 6 are mutually connected by a through hole provided on the first substrate 1 and a conductive resin 21 provided inside the through hole, and the liquid crystal layer 1
2 is applied with a predetermined voltage.

Further, on the back surface of the first substrate 1 in the transmissive area 19, an illuminating section 21 composed of an LED for performing light irradiation is provided.
And a light guide 22 for irradiating light to the transmission region 19.
Furthermore, the timepiece is constituted by the side 16 of the timepiece, the crown 20 and the windshield (not shown).

As described above, the first substrate 1 is filled with the through hole and the conductive material 21 in the through hole to connect the first electrode 3 to the connection terminal 7 on the drive circuit board 6. The connection can be performed in a very small area. Further, by using the drive circuit board 6 for the reflective layer 15, the components can be simplified. Further, the drive circuit board 6 can be used to reinforce the thin glass 1 and the reliability of the liquid crystal display device can be improved. Therefore, it is possible to improve the impact resistance and the like of the timepiece.

Next, the structure of the liquid crystal display panel and the drive circuit board according to the fifth embodiment of the present invention will be described with reference to FIGS.
Explanation will be made using 0. FIG. 9 is a plan view showing a liquid crystal display panel according to the fifth embodiment of the present invention. FIG. 10 is a sectional view showing a section taken along line EE in the plan view of FIG. Hereinafter, a fifth embodiment of the present invention will be described with reference to FIGS. 9 and 10 alternately.

On the first substrate 1 made of a plastic substrate, the drive circuit substrate 6 is bonded with a photosensitive resin. The integrated circuit of the drive circuit board 6 is arranged in a direction facing the first substrate 1, and has a plurality of connection terminals 7 for applying signals to the liquid crystal display panel on the drive circuit board 6. Furthermore, on the first substrate 1, as a transparent conductive film,
First electrode 3 made of indium tin oxide (ITO) film
Having. Further, a second substrate 2 facing the first substrate 1 is provided. On the second substrate 2, there is provided a second electrode 10 that intersects the first electrode 3 via the liquid crystal layer 12. First
Substrate 1, first electrode 3, second substrate 2 and second electrode 1
An alignment film 11 for aligning the liquid crystal layer 12 is provided on the reference numeral 0. In addition, the first substrate 1 and the second substrate 2 are bonded to each other with a predetermined gap at the seal portion 13 in order to enclose the liquid crystal layer 12. A conductive spacer (not shown) is mixed into the seal portion 13. The first electrode 2 on the first substrate 1 and the transfer electrode 25 on the second substrate 2 are electrically connected to each other at the connection portion 24 by a conductive spacer (not shown). Is transferred onto the second substrate 2.

Next, as shown in FIG. 10, the connection terminals 7 on the drive circuit board 6 in contact with the first board 1 are connected to the electrodes 25 and 10 on the second board 2 and the conductive resin 21. Connecting.

As described above, the connection between the electrodes on the first substrate 1 or the second substrate 2 and the connection terminals 7 on the drive circuit board 6 can be performed in a very small area. Become. Further, when many members are integrated in a very limited space such as a timepiece, the first substrate 1 constituting the liquid crystal display panel is made thinner to reinforce the bonding strength with the driving circuit substrate 6, and at the same time, Moisture permeating the first substrate 1,
Alternatively, the gas component can be cut off by the drive circuit board 6, so that a highly reliable and thin liquid crystal display panel can be formed, and the display quality of the liquid crystal display device can be improved. Further, when actually performing display, a reflection layer (not shown) is provided on the surface of the drive circuit substrate 6, and a polarizing plate and a surface diffusion plate are provided on the surface of the second substrate 2 opposite to the liquid crystal layer 12. (Not shown).

Further, an optical retardation plate may be inserted between the polarizing plate and the second substrate 2 if necessary. Also, the first
Since the substrate 1 is thin, even if a reflection layer and a color filter layer (not shown) are provided on the drive circuit substrate 6, an image blur (double image) occurs because the distance between the liquid crystal layer 12 and the reflection layer is short. do not do. Further, scattering is enabled by unevenness using steps due to an integrated circuit pattern provided on the drive circuit board 6, a reflective layer is provided via an insulating film, and a multi-color display bright reflective panel is formed by a color filter. Becomes possible.

Furthermore, since the first substrate 1 is reinforced by the drive circuit substrate 6, a conductive spacer (not shown) is mixed into the sealing material 13, and the first spacer 1 is formed by the conductive spacer.
Even if the electrode 3 is moved onto the second substrate, the first substrate 1 can be prevented from warping and cracking, and the connection between each electrode on the second substrate 2 and the connection terminal 7 on the drive circuit substrate 6 can be prevented. The stability is greatly improved.

[0061]

As is apparent from the above description, the drive circuit board 6 is disposed on the back surface of the first substrate 1, and the electrodes on the first board and the connection terminals 7 on the drive circuit board 2 are connected to each other. By forming a depression in the side wall of the first substrate and applying a conductive adhesive, the volume of the connection portion between the liquid crystal display panel and the drive circuit can be reduced.

Further, a through hole is provided in the first substrate 1, and an inner wall of the through hole is subjected to a conduction treatment.
The connection between the first electrode 3 and the drive circuit board 6 allows connection stability.

The driving circuit board 6 located around the display pixel formed by the intersection of the first electrode 3 and the second electrode 10 on the first substrate 1 or the second substrate 2 And a photovoltaic element. By connecting this photovoltaic element to a charge storage battery or a drive circuit, the effect of reducing the power consumption of the liquid crystal display device is exhibited. It can be used by utilizing the present invention. Further, in the case where a switching element is provided on the first substrate 1 or the second substrate 2, a photovoltaic element is provided around a display electrode connected to the switching element, so that a display of a display pixel portion close to the display electrode is provided. Interference can be prevented.

Further, when the same liquid crystal display panel has a reflective area and a transmissive area, a drive circuit board is arranged in the reflective area, and a reflective layer is provided on a part of the drive circuit board, so that the liquid crystal display device can be made thin. It is effective for the conversion. In addition, since a circuit malfunction may occur when light is applied to the drive circuit board, providing a reflective layer (light shielding layer) on the drive circuit board can prevent malfunction of the drive circuit and increase the liquid crystal display device. This is effective in preventing the display quality from deteriorating.

Further, by bonding the drive circuit substrate 6 to the back surface of the first substrate 1, it is possible to use a substrate, such as a plastic substrate, which is difficult to prevent the transmission of external moisture and impurity ions, or to make the substrate thinly deformed. It is also possible to use a substrate that is easy to use. In addition, the first
In comparison with the case where the electrodes are formed, the present invention is effective in flattening the drive circuit substrate, facilitating the formation of the reflective layer, and preventing deterioration of the drive circuit. Further, as compared with the case where the driving circuit is inherent in the first substrate 1, the density of the driving circuit and the degree of integration of the memory circuit and the microcomputer circuit can be improved, and high-quality display and multifunctional display can be performed. .

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a planar structure of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a cross-sectional structure of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a planar structure of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 4 is a diagram illustrating a cross-sectional structure of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 5 is a diagram illustrating a planar structure of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 6 is a diagram illustrating a cross-sectional structure of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 7 is a diagram illustrating a planar structure of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 8 is a diagram illustrating a cross-sectional structure of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 9 is a diagram illustrating a planar structure of a liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 10 is a diagram illustrating a cross-sectional structure of a liquid crystal display device according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st board | substrate 2 2nd board | substrate 3 1st electrode 4 Liquid crystal display panel connection part 5 recess 6 Drive circuit board 7 Connection terminal 8 Drive circuit board connection part 9 Adhesive 10 Second electrode 11 Alignment film 12 Liquid crystal layer DESCRIPTION OF SYMBOLS 13 Seal part 14 Through hole 15 Reflective layer 21 Conductive resin 35 Switching element for 1st electrode 36 Switching element for display electrode 37 Photovoltaic element

Claims (8)

[Claims] 1. A semiconductor device comprising: a first substrate and a second substrate facing each other at a predetermined interval; a first electrode provided on the first substrate; and a second electrode provided on the second substrate. A liquid crystal between the first substrate and the second substrate;
A liquid crystal display device that applies a signal to the first electrode and performs display by optical change of the liquid crystal, and is connected to a driving circuit provided on a driving circuit substrate that applies a signal to the first electrode or the second electrode, and connected to the driving circuit. The connection terminal and the first electrode or the second electrode are connected to each other via a conductive material provided on at least a side wall of the first substrate or the second substrate. Part of the circuit is disposed on the back surface of the first substrate or the second substrate, and further, a reflection layer for reflecting light transmitted through the first substrate or the second substrate is provided on the drive circuit substrate. A liquid crystal display device characterized by the above-mentioned. 2. A semiconductor device comprising: a first substrate and a second substrate facing each other at a predetermined interval; a first electrode provided on the first substrate; and a second electrode provided on the second substrate. A liquid crystal between the first substrate and the second substrate;
And a connection terminal on a drive circuit board having a drive circuit for applying a signal to the first electrode or the second electrode in a liquid crystal display device which applies a signal to the electrodes and performs display by optical change of the liquid crystal. The first electrode or the second electrode is connected through at least a through hole penetrating the first substrate or the second substrate, and a part of the drive circuit is connected to the first substrate or the second substrate. A liquid crystal display device, comprising: a reflection layer disposed on a back surface of the substrate, and a reflection layer for reflecting light transmitted through the first substrate or the second substrate on the drive circuit substrate. 3. A semiconductor device comprising: a first substrate and a second substrate facing each other at a predetermined interval; a first electrode provided on the first substrate; and a second electrode provided on the second substrate. , A liquid crystal between a first substrate and a second substrate, and a first electrode and a second electrode.
And a connection terminal on a drive circuit board having a drive circuit for applying a signal to the first electrode or the second electrode in a liquid crystal display device which applies a signal to the electrodes and performs display by optical change of the liquid crystal. The first electrode or the second electrode is connected to at least a side wall of the first substrate or the second substrate or through a through hole, and is driven on the back surface of the first substrate or the second substrate. A liquid crystal display device comprising: a circuit board; and a photovoltaic element disposed on the driving circuit board and at least around each display pixel for applying a voltage to the liquid crystal layer. 4. A semiconductor device comprising: a first substrate and a second substrate facing each other at a predetermined interval; a first electrode provided on the first substrate; and a second electrode provided on the second substrate. , A liquid crystal between a first substrate and a second substrate, and a first electrode and a second electrode.
In a liquid crystal display device that performs display by applying a signal to an electrode of the liquid crystal and performs optical display of the liquid crystal, the liquid crystal display device includes a transmissive region for visualizing display by a light source disposed on the back surface, a reflective layer disposed on the back surface, and external light. And at least two regions for visualizing the display according to the first region of the reflection region.
The drive circuit board is arranged on the back surface of the second circuit board or the second board, and the reflective surface is provided on the front surface of the drive circuit board. The drive circuit board and the first board or the second board are mutually separated. The connection terminal on the drive circuit board, which is bonded and has a drive circuit for applying a signal to the first electrode or the second electrode, and the first electrode or the second electrode are at least the first electrode or the second electrode. A liquid crystal display device, wherein the liquid crystal display device is connected through a side wall of a substrate or a second substrate or through holes. 5. A driving circuit substrate in contact with the first substrate or the second substrate, the surface of the driving circuit substrate having irregularities, and further comprising a reflection layer serving as a reflection surface. 4. The liquid crystal display device according to any one of items 4. 6. A color filter for transmitting or reflecting some optical wavelengths on a surface of a driving circuit board in contact with the first substrate or the second substrate. A liquid crystal display device according to claim 4. 7. An apparatus according to claim 1, further comprising an interference plate having a transmission part and a light shielding part between said first substrate or said second substrate and said driving circuit substrate. 3. The liquid crystal display device according to 1. 8. The switching element according to claim 1, wherein a two-terminal switching element or a three-terminal switching element is connected to the electrodes on the first substrate or the second substrate. The liquid crystal display device according to any one of the above.