JP2001305571A - Mounting structure of liquid crystal display device and electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure and electronic equipment of a liquid crystal display device in which mounting of the liquid crystal display device to the electronic equipment can be performed easily, the mounting volume can be reduced by excluding an area necessary for connection by eliminating a soldering part at the time of the mounting the liquid crystal display device, and reduction of a mounting process can be realized. SOLUTION: A spring connector having a plurality of spring terminals with repulsive force is placed by pressure between a liquid crystal panel and a circuit board. Electrical connection between the liquid crystal panel and the circuit board is performed using the repulsive force of the spring connector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for mounting a liquid crystal display device on various electronic devices. The present invention also relates to a portable electronic device configured using the mounting structure.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices for displaying visible information have been widely used in various electronic devices such as mobile phones and electronic organizers. This liquid crystal display device generally performs display by controlling the orientation of liquid crystal, and includes an external connection terminal for transmitting a signal for controlling the orientation of the liquid crystal.

In the liquid crystal display device of the above-described embodiment, the external connection terminal is connected to an output terminal of a host control unit on the electronic device side, so that the liquid crystal display device is mounted on the electronic device. Conventionally, connection between an external connection terminal of a liquid crystal display device and an output terminal of an electronic device has been performed using an ACF (Anisotropic Cond.).
An FPC (Flexible) is attached to those terminals using an adhesive such as an active film (anisotropic film).
In general, printing is performed by thermocompression bonding of a printed circuit, but in recent years, a liquid crystal panel is mounted by so-called COG (Chip on Glass) mounting in which a driving IC is directly mounted by thermocompression on a glass substrate constituting a liquid crystal panel. Has been reduced in size. In these liquid crystal panels, the driving IC is installed by thermocompression bonding. When connecting the external connection terminal to the output terminal of the host control unit on the electronic device side, if the connection is made by a simple FPC, the FPC
Since the drive IC may fall off due to the heat applied at the time of thermocompression bonding, a method of connecting and mounting the external connection terminal and the output terminal of the host control unit on the electronic device side using a spring connector has been devised. ing.

FIG. 7 shows a mounting method showing a conventional mounting method. 41 is an upper case of the mobile phone, and 42 is a lower case of the mobile phone. The upper case 41 is provided with a transmitting / receiving antenna 43, a keyboard unit 44, a microphone (not shown) and the like. On the other hand, in the lower case 42, a liquid crystal panel 1001 is installed on a circuit board 1008. An output terminal 1100 is formed on the circuit board 1008, and an electrical connection with the liquid crystal panel 1001 is secured by soldering a spring connector 1020. Further, on the circuit board 1008, a not-shown speaker, a receiving unit, a transmitting unit, a control unit including a CPU, a power supply unit, and the like are provided. The control unit reads the states of the transmitting unit and the receiving unit, supplies information to the liquid crystal panel 1001 based on the results, and displays visible information, for example, characters and numerals.

[0005]

In the conventional connection method using a spring connector, the spring connector is soldered to the circuit board. Therefore, an area required for soldering the spring connector and the circuit board is required. There is a problem that the mounting volume increases due to the parts, and the volume of various electronic devices such as a mobile phone and an electronic organizer increases.

Furthermore, the conventional connection method using a spring connector requires a step required for soldering.
There was a problem that the mounting process had to be complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in a conventional mounting structure for a liquid crystal display device, and has a liquid crystal display device mounting structure capable of easily mounting the liquid crystal display device on electronic equipment. An object is to provide an electronic device. In particular, the present invention provides a liquid crystal display device mounting structure and an electronic device capable of reducing a mounting volume by reducing an area required for connection and reducing a mounting process by eliminating a soldering part when mounting the liquid crystal display device. The purpose is to do.

[0008]

A mounting structure of a liquid crystal display device according to the present invention is provided in a press-fit state between a liquid crystal panel and a circuit board, and is electrically connected by utilizing the elasticity of the spring connector. The connection is made.

A liquid crystal panel having a mounting structure of a liquid crystal display device according to the present invention has a terminal for external connection, one glass substrate on which a translucent counter electrode is formed, and a polycrystalline silicon TF.
The liquid crystal is sandwiched by the other glass substrate formed with T and having a circuit for driving the alignment control of the liquid crystal, and the one glass substrate and the other glass substrate are electrically connected via at least one transfer electrode. Is what is being done.

A liquid crystal panel having a mounting structure for a liquid crystal display device according to the present invention has a terminal for external connection, one glass substrate on which a translucent counter electrode is formed, and a polycrystalline silicon TF.
The liquid crystal is sandwiched by the other glass substrate formed with T and having a circuit for driving the alignment control of the liquid crystal, and the one glass substrate and the other glass substrate are electrically connected via at least one transfer electrode. This is a reflection type liquid crystal panel which is connected and a pixel electrode provided on the other glass substrate is formed of a metal surface.

In the electronic device according to the present invention, the connection between the liquid crystal panel and the circuit board has the mounting structure according to any one of claims 1 to 3.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 shows an embodiment of a mounting structure of a liquid crystal display device 1 according to the present invention, which is configured by storing a light source 5 and a liquid crystal panel 2 in a case 6. Case 6
A plurality of locking pieces 7 are formed at the bottom of the side surface of the electronic device. The locking pieces 7 are fitted into locking holes 9 provided in a circuit board 8 of the electronic device, so that the liquid crystal panel 2 Installed in a location.

As shown in FIG. 2, the liquid crystal panel 2 has a pair of a transparent substrate 11a and an array substrate 11b facing each other.
Having. These substrates 11a and 11b are formed of, for example, glass, plastic, or the like. Transparent substrate 1
On the surface of 1a, a transparent electrode 12a is formed by a color filter (not shown) and further by ITO (Indium Tin Oxide). An alignment film 13a is formed on the transparent electrode 12a, and an alignment process, for example, a rubbing process is performed on the alignment film 13a.

The array substrate 11b has a pixel electrode 12b made of ITO, a pixel electrode, a pair of pixel TFTs and a TFT.
And an array portion 11c in which a drive circuit for giving a signal to the pixel TFT is formed. This array section 11c
Includes at least a polycrystalline silicon TFT. An alignment film 13b is formed on the pixel electrode 12b, and is subjected to an alignment process.

The substrates 11a and 11b are superimposed on each other so that the transparent electrode 12a and the pixel electrode 12b face each other. Then, they are bonded by the sealing material 14 so as to form an appropriate gap, that is, a cell gap. The liquid crystal 16 is sealed in the cell gap.

The transparent substrate 11a protrudes outside the array substrate 11b.
a is formed. These connection wires 21a are connected to a drive circuit on the array substrate 11b via a transparent electrode 12a and a transfer material 20 made of a conductive material provided between the transparent substrate 11a and the array substrate 11b. An external connection terminal 19 is formed at the end of the overhang of the transparent substrate 11a. The external connection terminal 19 is for inputting a signal for controlling the orientation of the liquid crystal, thereby modulating the light to display a visible image and controlling the orientation of the liquid crystal.

As shown in FIG. 1, on the surface of the circuit board 8 on which the liquid crystal display device 1 is mounted, there is provided an output terminal 26 which is connected to a host control unit on the electronic device side and outputs a liquid crystal alignment control signal. Have been. A spring connector 27 is provided directly above the output terminal 26.

As shown in FIG. 3, the spring connector 2
7 is a plurality of spring terminals 2 arranged in parallel with each other.
8 Each spring terminal 28 has two movable terminals, a movable terminal 28a protrudes outside from the upper surface of the connector main body 27, and another movable terminal 28b protrudes outside from a lower surface of the connector main body 27. The movable terminals 28a and 28b are configured to be able to swing in the vertical direction in the drawing by the spring property (elasticity) of the spring terminal 28 itself. The spring connector 27 is configured to be mounted on the circuit board 8 with the movable terminal 28b of the spring terminal 28 in contact with the output terminal 26 on the circuit board 8.

In FIG. 3, first, on the circuit board 8,
A spring connector 27 having a plurality of spring terminals 28 is mounted. Next, the liquid crystal panel 2 is placed on the circuit board 8 on which the spring connector 27 is mounted, and then the case 6 is fitted into the circuit board 8. By this assembling process, the spring connector 27 having the plurality of spring terminals 28 having a resilient force is connected to the liquid crystal panel 2.
And the circuit board 8. Therefore, a plurality of spring terminals 2 having elasticity
8 is compressed against its own resilient force, and as a result, the external connection terminal 19 of the liquid crystal panel 2 and the output terminal 26 of the circuit board 8 are movable. Terminals 28a, 28
b, and the movable terminals 28a, 28b are pressed against the external connection terminals 19 of the liquid crystal panel 2 and the output terminals 26 of the circuit board 8. As described above, the spring terminal 2
8 itself has a spring property (elasticity), so that the movable terminals 28a and 28b of the spring terminal 28 are fixed while the external connection terminal 19 and the output terminal 26 are pressed by the spring property, and the external connection terminal 19. A stable and reliable conductive connection with the output terminal 26 is obtained.

Here, in the case of a liquid crystal panel using an array substrate having a built-in drive circuit for controlling the orientation of liquid crystal, the number of transfers is significantly reduced as compared with a case where no drive circuit is built in. (Because the driving circuit can distribute the display data signal transmitted serially to each pixel wiring.
In a conventional liquid crystal panel, display data is transmitted in parallel to each pixel wiring, so that the number of transfers is also necessary for the number of pixel wirings). Therefore, the area for installing the transfer can be reduced, and the mounting area for securing the electrical connection from the external connection terminal via the transfer to the array substrate can be further reduced.

Embodiment 2 FIG. FIG. 4 shows an embodiment of the mounting structure of the liquid crystal display device according to the present invention. First,
The liquid crystal display device 1 shown here is configured by storing the liquid crystal panel 103 in the case 6. A plurality of locking pieces 7 are formed on the bottom of the side surface of the case 6, and the locking pieces 7 are fitted into locking holes 9 provided in a circuit board 8 of the electronic device, whereby the liquid crystal panel 103 is formed on the circuit board 8. It is installed at the upper predetermined position. As shown in FIG. 5, the liquid crystal panel 103 has a pair of transparent substrates 11a and an array substrate 110 facing each other. The array substrate 110 includes a pixel T
A TFT layer 11c, which is formed of an FT or a TFT and is formed with a drive circuit for giving a signal to a pixel TFT, and a plurality of reflective pixel electrodes 120 made of a metal film are formed. Part of the pixel TFT and the driving circuit includes at least a polycrystalline silicon TFT. An alignment film 13b is formed on the reflective pixel electrode 120, and is subjected to an alignment process. These substrates 11a and 11b are superimposed on each other such that the transparent electrode 12a and the reflective pixel electrode 120 face each other. Then, they are bonded by the sealing material 14 so as to form an appropriate gap, that is, a cell gap. The liquid crystal 16 is sealed in the cell gap.

Since the liquid crystal display device of this embodiment is configured as described above, in FIG. 5, when light enters from the outside, the light passes through the transparent substrate 11a and is reflected by the reflective pixel electrode 120. Then, the light is radiated again from the transparent substrate 11a to the outside, and is recognized as visible information without providing a light source below the liquid crystal panel.

Embodiment 3 FIG. FIG. 6 shows an embodiment of an electronic device according to the present invention. This embodiment is an example in which the mounting structure of the liquid crystal display device according to the present invention is applied to a mobile phone as an electronic device. 41 is an upper case 41, 42 is a lower case of a mobile phone. The upper case 41 is provided with a transmitting / receiving antenna 43, a keyboard unit 44, a microphone (not shown) and the like. On the other hand, in the lower case 42, for example, the liquid crystal panel 2 shown in FIG. An output terminal 26 is formed on the circuit board 8,
Electrical connection with the liquid crystal panel 2 is ensured by the spring connector 27. Further, on the circuit board 8, a speaker (not shown), a receiving unit and a transmitting unit, a control unit including a CPU, a power supply unit, and the like are provided. The control unit reads the states of the transmitting unit and the receiving unit, and supplies information to the liquid crystal panel based on the result, and provides visible information, such as characters
Displays numbers etc.

As described above, the present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the embodiments, and can be variously modified within the scope of the invention described in the claims.

[0025]

According to the present invention, since the spring terminal itself has resilience (elasticity), the electrical connection between the external connection terminal of the liquid crystal panel and the output terminal of the electronic device is established. It can be reliably achieved without requiring a special large pressing force, and the space required for soldering the lower surface of the connector, which is required for the conventional structure, and the work process are unnecessary, so that the mounting area can be reduced, In addition, there is an effect that workability for mounting is remarkably improved.

According to the present invention, when a liquid crystal panel in which external connection terminals are directly formed on a transparent substrate is mounted on a circuit substrate by a spring connector, a drive circuit made of polycrystalline silicon is built in the array substrate. Therefore, the number of transfers can be very small as compared with the number of pixel wirings, so that the area for installing the transfer can be reduced and the mounting area can be reduced.

According to the present invention, when a liquid crystal panel in which external connection terminals are directly formed on a transparent substrate is mounted on a circuit substrate by a spring connector, a drive circuit made of polycrystalline silicon is built in the array substrate. The electrical connection to the drive circuit is achieved by a transfer provided between the external connection terminal of the transparent substrate and the pixel electrodes are made of metal, so there is no need to install a light source below the liquid crystal panel, and mounting Can be simplified.

According to the present invention, the liquid crystal display device in which the liquid crystal panel in which the external connection terminals are directly formed on the transparent substrate is mounted on the circuit board by the spring connector is mounted. The size and weight of the mobile phone can be reduced. In particular, by using a reflective liquid crystal panel as a liquid crystal panel, a light source is not required, and power consumption required for the light source is not required. Therefore, there is an effect that the battery capacity of the mobile phone can be reduced, and further, the size and weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view of a mounting structure of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal panel according to Embodiment 1 of the present invention.

FIG. 3 is a sectional view of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 4 is an explanatory perspective view of a mounting structure of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 6 is a perspective explanatory view of a mounting structure of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 7 is a perspective explanatory view of a mounting structure of a conventional liquid crystal display device.

[Explanation of symbols]

Reference Signs List 1 liquid crystal display device, 2 liquid crystal panel, 5 light source, 6 case, 7 locking piece, 8 circuit board, 9 locking hole, 11a
Transparent substrate, 11b array substrate, 11c array part, 1
2a transparent electrode, 13a alignment film, 14 sealing material, 1
6 liquid crystal, 19 external connection terminal, 21a connection wiring,
26 output terminal, 27 spring connector, 27 connector body, 28 spring terminal, 28a, 28b
Movable terminal.

Claims (4)

[Claims] A liquid crystal panel having an external connection terminal;
In a mounting structure of a liquid crystal display device for electrically connecting an electronic device having an output terminal to a circuit board, the spring connector having a plurality of spring terminals having elasticity is pressed between the liquid crystal panel and the circuit board. A mounting structure for a liquid crystal display device, wherein the liquid crystal display device is arranged and arranged to make electrical connection by utilizing the elasticity of the spring connector. 2. A liquid crystal panel includes one transparent substrate on which a translucent counter electrode is formed, and the other glass substrate formed of a polycrystalline silicon TFT and having a circuit for driving alignment control of liquid crystal. 2. The mounting of the liquid crystal display device according to claim 1, wherein the liquid crystal panel sandwiches a liquid crystal, and the one glass substrate and the other glass substrate are electrically connected via at least one transfer electrode. Construction. 3. The liquid crystal panel has an external connection terminal,
The liquid crystal is sandwiched between one glass substrate on which a translucent counter electrode is formed and the other glass substrate formed of a polycrystalline silicon TFT and having a circuit for driving alignment control of the liquid crystal, and the one glass A liquid crystal panel in which a substrate and the other glass substrate are electrically connected via at least one transfer electrode, and a pixel electrode provided on the other glass substrate is a reflective liquid crystal panel formed of a metal surface. The mounting structure of the liquid crystal display device according to claim 1, wherein: 4. An electronic device comprising a liquid crystal panel mounted by the mounting structure according to claim 1.