JP3447981B2 - Liquid crystal display device and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal in which a liquid crystal material is enclosed between two glass plates facing each other, and information such as letters and numbers is displayed by energizing electrodes arranged on the glass plates. For driving the panel, which is electrically connected to the panel and electrode terminals for driving the panel, which are arranged on one side edge of the glass plate of the liquid crystal panel, and sends electric signals such as display control signals and display data signals to the liquid crystal panel. The present invention relates to a liquid crystal display device including a signal line substrate having a signal line and a backlight installed on the back surface of a liquid crystal panel, and a manufacturing method thereof.

[0002]

2. Description of the Related Art A liquid crystal panel is widely used as a small information display, such as a mobile phone or a PH.
It is an indispensable device for portable equipment such as S. Such a device is often used in a place where outside light cannot be sufficiently taken in as a use environment, and therefore it is necessary to make it easy to recognize the display information of the liquid crystal panel by turning on the backlight.

An example of a conventional structure of a liquid crystal display device having such a backlight is shown in FIGS.

In the liquid crystal display device shown in FIG. 5, the backlight is prepared separately from the liquid crystal panel. That is, the backlight 52 is installed on the base substrate 51, and the backlight 52
The land 5 provided with the electrode terminal 53 of the base substrate 51.
4 to be electrically connected by soldering (or, though not shown, electrically connected by using a plug-in type connector). Then, the liquid crystal panel 55 is installed on the upper surface of the backlight 52, and the signal line substrate 56 is formed on the panel driving electrode terminals (not shown) formed on one edge of the liquid crystal panel 55 on the glass plate. Further, the panel drive signal line (not shown) is electrically connected (this is referred to as prior art 1).

The liquid crystal display device shown in FIG.
A panel drive signal line (not shown) formed on the signal line substrate 66 is electrically connected to a panel drive electrode terminal (not shown) formed at one side edge of the glass plate of the liquid crystal panel 65. In this state, the LCD panel 65 is backlit 62.
Installed on the upper surface of the
It has a structure in which it is soldered to and electrically connected to a land 64 provided on the signal line board 66 (this is known as prior art 2
That).

Further, in the backlight device for a liquid crystal display described in Japanese Patent Laid-Open No. 148629/1994, as shown in FIG. 7, the electrode terminals 72 of the backlight 71 are the same as the panel driving electrode terminals 74 of the liquid crystal panel 73. The electrode terminals 72 of the backlight 71 and the liquid crystal panel 7 are arranged in a plane.
3 has a structure in which a conductive rubber connector 78 is interposed between the panel driving electrode terminal 74 and the panel driving wiring land 76 and the backlight wiring land 77 formed on the base substrate 75. (This is prior art 3
That).

[0007]

However, in the liquid crystal display device of the prior art 1, a soldering process, a fitting process into a connector, etc. are additionally required, and a connecting process between the liquid crystal panel 55 and the signal line substrate 56 is also required. Workability is poor because it is required separately. Since the base substrate 51 is required, there is a problem that the installation place is restricted when the liquid crystal display device is incorporated into a device.

Further, in the liquid crystal display device of the prior art 2, the electrode terminal 6 of the backlight 62 is the same as that of the prior art 1.
3 requires a soldering step for connecting 3 to the land 64 of the signal line board 66, and a separate connecting step between the liquid crystal panel 65 and the signal line board 66, resulting in poor workability. If the signal line board 66 is made of a flexible material, for example, the electrode terminal 6 of the backlight 62 is used during transportation.
There is a problem that stress is easily applied to the connection portion between the signal line 3 and the signal line of the signal line substrate 66, and a defect such as a connection failure is likely to occur.

Further, in the liquid crystal display device of the prior art 3, the electrode terminals 72 of the backlight 71 and the panel driving electrode terminals 74 of the liquid crystal panel 73 are connected to the corresponding wiring lands 76 formed on the base substrate 75. 77 is simultaneously connected to 77 using a conductive rubber connector 78. However, the electrode pitch of the recent liquid crystal panel 73 is very fine, and strict alignment is required. Therefore, it is virtually impossible to electrically connect via the conductive rubber connector 78. Therefore, when the method of the conventional technique 3 is used, only the electrode terminal 72 of the backlight 71 is connected to the wiring land 77 of the base substrate 75 by using the conductive rubber connector 78.
Therefore, it is necessary to separately attach the conductive rubber connector 78 for that reason, and the workability is reduced. Also, since the base substrate 75 is required,
There is a problem that the installation place is restricted when the liquid crystal display device is incorporated into the device.

The present invention was devised to solve the above problems, and its purpose is to provide a panel driving electrode terminal arranged on a glass plate of a liquid crystal panel and a panel driving signal provided on a signal line substrate. It is an object of the present invention to provide a liquid crystal display device and a manufacturing method thereof in which workability is improved by enabling a backlight lighting control signal line and a backlight electrode terminal to be simultaneously connected when connecting a line.

[0011]

In order to solve the above problems, in a liquid crystal display device of the present invention, a liquid crystal material is enclosed between two glass plates facing each other, and electrodes arranged on the glass plates are provided. A liquid crystal panel that displays information such as characters and numbers when energized and a panel drive electrode terminal arranged at one side edge of the glass plate of the liquid crystal panel are electrically connected and displayed on the liquid crystal panel. A liquid crystal display device comprising a signal line substrate having a panel drive signal line for transmitting electric signals such as control signals and display data signals, and a backlight installed on the back surface of the liquid crystal panel, wherein one side on the glass plate A backlight electrode terminal is arranged at the edge portion, and a backlight lighting control signal line for controlling the lighting of the backlight is arranged on the signal line substrate, and on the glass plate. Location backlight electrode terminals on the backlight electrode terminals provided on the disposed on the signal line substrate backlight lighting control signal lines and is electrically connected Rutotomoni, the backlight electrode
The connection between the terminal and the electrode terminal is a key type
This key-shaped electrode terminal is bent into a shape
Is opposite to the surface of the glass plate in contact with the backlight
The electrode terminal for backlight arranged on the side surface
It is connected to .

Further, in the method for manufacturing a liquid crystal display device according to the present invention, the liquid crystal panel is mounted on the upper surface of the backlight mounted on the bonding stage, and the surface of the glass plate of the liquid crystal panel which is in contact with the backlight. And the opposite side
To the electrode terminal for the backlight arranged on the one side edge above ,
Is it standing upright from one side edge of the backlight?
Arranged so as to overlap the electrode terminals of a triangular shape from above, the panel drive electrode terminal and the backlight electrode terminal arranged at one side edge on the glass plate of the liquid crystal panel,
By arranging the panel drive signal line and the backlight lighting control signal line provided on the signal line substrate so as to face each other from above and stacking them, and pressing these overlapping portions from above by a heated bonding head, It is characterized in that the panel drive signal line provided on the line substrate and the panel drive electrode terminal of the liquid crystal panel, and the backlight electrode terminal and the backlight electrode terminal arranged on the liquid crystal panel are respectively connected.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing the structure of the liquid crystal display device of the present invention, FIG. 2 is a perspective view of the liquid crystal display device of the present invention, and FIG. 3 is a side view of the liquid crystal display device of the present invention. is there.

This liquid crystal display device is roughly divided into two glass plates 11a and 11b facing each other, with a liquid crystal material (not shown) enclosed between the glass plates 11a and 11b.
Liquid crystal panel 1 that displays information such as letters and numbers by energizing electrodes (not shown) respectively arranged on the opposing surfaces of the liquid crystal panel 1, and one side edge of the opposing surface of one glass plate 11a of the liquid crystal panel 1. Panel driving electrode terminal 1 arranged in
A signal line board 2 such as an FPC (flexible printed circuit) having a panel drive signal line 22 that is electrically connected to the liquid crystal panel 1 and sends electric signals such as a display control signal and a display data signal to the liquid crystal panel 1; And a backlight 3 installed on the back surface of the.

In the above structure, in the present invention, the backlight electrode terminals 13 are provided on both outer sides of the panel driving electrode terminals 12 arranged at one side edge of the facing surface of the glass plate 11a.
a and 13b are arranged, and the backlight lighting control signal lines 23a and 23b for controlling the lighting of the backlight 3 are arranged on both outer sides of the panel driving signal line 22 provided on the signal line substrate 2. There is. Also, the glass plate 11a
Between the panel driving electrode terminal 12 and the backlight electrode terminal 13a, 13b of
4b is provided, and the panel drive signal line 22 of the signal line substrate 2 and the backlight lighting control signal lines 23a, 23 are provided.
Alignment marks 24a and 24b are provided between them and b.

On the other hand, at one side edge of the backlight 3, electrode terminals 31a, 31b are provided at positions facing the backlight electrode terminals 13a, 13b arranged at one side edge of the glass plate 11a of the liquid crystal panel 1. Is provided. The electrode terminals 31a and 31b are formed in a hook shape in which they vertically rise from one side edge portion of the backlight 3 and their tip portions are bent toward the upper surface (light emitting surface) 32 side of the backlight 3.

In each of the constituent members having such a shape, the liquid crystal panel 1 is installed on the light emitting surface 32 of the backlight 3 with the display surface (the glass plate 11b side) facing upward. Provided electrode terminals 31a, 31
b and the backlight electrode terminals 13a and 13b arranged on the glass plate 11a of the liquid crystal panel 1 are electrically connected. However, in the present embodiment, the anisotropic conductive film 15 (see FIG. 3) is attached to the panel driving electrode terminals 12 and the backlight electrode terminals 13a and 13b arranged on the glass plate 11a of the liquid crystal panel 1. Attach it. That is, the backlight electrode terminals 13 a and 13 b and the backlight electrode terminals 31 a and 31 b are electrically connected via the anisotropic conductive film 15 .

Further, with the front end edge of the signal line substrate 2 facing the one side edge of the glass plate 11a of the liquid crystal panel 1 from above, the panel drive electrode terminal 12 of the glass plate 11a and the signal line. The panel driving signal line 22 of the substrate 2 is electrically connected via the anisotropic conductive film 15, and the backlight electrode terminals 13a and 13b of the glass plate 11a are also connected.
And the signal line 23 for controlling the backlight lighting of the signal line board 2
a and 23b are electrically connected through the anisotropic conductive film 15. That is, the electrode terminals 31a and 31b of the backlight 3 and the backlight lighting control signal lines 23a and 23b provided on the signal line board 2 are the same as the backlight electrode terminals 13a and 13a of the glass plate 11a.
It is configured to be electrically connected via 13b.

Next, a method of manufacturing the liquid crystal display device having the above structure will be described with reference to the manufacturing process chart shown in FIG.

The backlight 3 is set on the bonding stage 41 with the light emitting surface 32 of the backlight 3 facing upward.

Next, the anisotropic conductive film 1 is attached to the panel driving electrode terminals 12 and the backlight electrode terminals 13a and 13b arranged on the glass plate 11a of the liquid crystal panel 1.
With 5 attached, the liquid crystal panel 1 is installed on the backlight 3 with the display surface (glass plate 11b) side facing up. At this time, the electrode terminals 31a, 31b of the backlight 3 are arranged so as to overlap with the electrode terminals for backlight 13a, 13b arranged at one side edge of the glass plate 11a from above (see FIGS. 1, 2 and the like). ).

Next, the leading edge of the signal line substrate 2 is arranged to face one edge of the glass plate 11a of the liquid crystal panel 1 from above. At this time, a camera (not shown) is installed in the bonding stage 41, and the alignment marks 14a and 14b of the liquid crystal panel 1 are arranged from below the liquid crystal panel 1.
And alignment marks 24a and 24b on the signal line substrate 2
Is photographed, and alignment is performed so that the positions of both alignment marks (14a and 24a, and 14b and 24b) match. As a result, the panel drive signal line 22 provided on the signal line substrate 2 and the backlight lighting are provided on the panel drive electrode terminal 12 and the backlight electrode terminals 13a and 13b arranged at one side edge of the glass plate 11a. The control signal lines 23a and 23b can be arranged so as to face each other from above and to be overlapped.

Thereafter, the bonding head 42 arranged above the bonding stage 41 is lowered while being heated, and the overlapping portions are pressed from above, whereby the panel drive signal line provided on the signal line substrate 2 is pressed. 22 and the panel driving electrode terminal 12 of the liquid crystal panel 1, and the backlight electrode terminal 1 arranged in the liquid crystal panel 1.
3a and 13b, the backlight lighting control signal lines 23a and 23b of the signal line substrate 2, and the electrode terminals 31 of the backlight.
Then, a and 31b are simultaneously connected to each other, and the manufacturing of the liquid crystal display device is completed.

In the above embodiment, the signal line board 2 is used.
However, a tape carrier package (TCP), a chip-on-film (COF) or the like may be used. Further, the glass plate 11a of the liquid crystal panel 1 may be a chip-on-glass (COG) in which a liquid crystal drive IC is installed. Further, the anisotropic conductive film 15 may be another material having the same effect. Further, in the above-described embodiment, the panel driving electrode terminal 12 and the backlight lighting control electrode terminal 13a, 13b of the liquid crystal panel 1 are provided on the upper surface (opposing surface) of the glass plate 11a opposite to the display surface. However, it may be provided on the lower surface (opposing surface) of the glass plate 11b on the display surface side.

[0026]

The liquid crystal display device of the present invention and the manufacturing method thereof.
According to this , since the backlight electrode terminal is arranged on one side edge of the glass plate and the backlight signal line for controlling the lighting of the backlight is arranged on the signal line substrate, the liquid crystal panel When connecting the panel drive electrode terminals arranged on one side edge of the glass plate and the panel drive signal lines provided on the signal line board, at the same time, the backlight electrode terminals and the backlight signal lines are connected. Since and can be connected, workability is improved compared to the conventional one. In addition, since the base substrate which is conventionally required is not required, there is an effect that there is less restriction on the installation place when the liquid crystal display device is incorporated into a device.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a structure of a liquid crystal display device of the present invention.

FIG. 2 is a perspective view of a liquid crystal display device of the present invention.

FIG. 3 is a side view of the liquid crystal display device of the present invention.

FIG. 4 is a diagram showing a step of manufacturing the liquid crystal display device of the present invention.

FIG. 5 is a schematic plan view showing an example of a conventional structure of a liquid crystal display device.

FIG. 6 is a schematic plan view showing an example of a conventional structure of a liquid crystal display device.

FIG. 7 is an exploded perspective view showing an example of a conventional structure of a liquid crystal display device.

[Explanation of symbols]

1 LCD panel 2 signal line board 3 backlight 11a, 11b glass plate 12 Panel drive electrode terminals 13a, 13b Backlight electrode terminals 15 Anisotropic conductive film 22 Panel drive signal line 23a, 23b Backlight lighting control signal line 31a, 31b Electrode terminals 41 Bonding stage 42 Bonding head

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02F 1/1345 G02F 1/13357 G02F 1/1335 G02F 1/1333

Claims (2)

(57) [Claims] 1. A liquid crystal panel in which a liquid crystal material is enclosed between two glass plates facing each other, and information such as characters and numbers is displayed by energizing electrodes arranged on the glass plates, and the liquid crystal. It has a panel drive signal line which is electrically connected to a panel drive electrode terminal arranged on one side edge of the glass plate of the panel and sends an electric signal such as a display control signal and a display data signal to the liquid crystal panel. In a liquid crystal display device comprising a signal line substrate and a backlight installed on the back surface of the liquid crystal panel, a backlight electrode terminal is arranged at one side edge of the glass plate, and a backlight is provided on the signal line substrate. place a backlight lighting control signal line for controlling lighting light, provided on the backlight before Symbol backlight electrode terminals disposed on a glass plate Disposed on the signal line substrate and electrode terminal and the backlight lighting control signal line is electrically connected Rutotomoni, electrode terminals for the backlight
And the electrode terminal are connected, the electrode terminal has a hook shape.
The key-shaped electrode terminal is
On the side opposite to the surface of the glass plate in contact with the backlight
Contact with the backlight electrode terminals that are placed on the surface
A liquid crystal display device characterized by being continued . 2. The liquid crystal panel is mounted on the upper surface of the backlight mounted on the bonding stage, and the surface of the glass plate of the liquid crystal panel opposite to the surface in contact with the backlight.
Vertically rise from the one side edge of the backlight to the backlight electrode terminal arranged on the one side edge on the opposite surface.
A signal line board is provided on the panel drive electrode terminals and the backlight electrode terminals arranged on one side edge of the glass plate of the liquid crystal panel by arranging the hook-shaped electrode terminals so as to be stacked from above. The panel drive signal line and the backlight lighting control signal line provided in the above are arranged so as to be opposed to each other from above, and the heated bonding head presses these overlapping portions from above so that the signal line substrate is A liquid crystal display device characterized in that a panel drive signal line provided and a panel drive electrode terminal of a liquid crystal panel, and a backlight electrode terminal and a backlight electrode terminal arranged on the liquid crystal panel are respectively connected. Production method.