JP3301941B2 - Liquid crystal display - 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 display device having a circuit board disposed on at least one side of a liquid crystal cell via a circuit element for driving a liquid crystal, and having a connector on the circuit board.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal display of this type in which a circuit board is arranged on at least one side of a liquid crystal cell via a circuit element for driving a liquid crystal, as disclosed in, for example, Japanese Patent Application Laid-Open No. 8-129164. A rubber pressing member thicker than the thickness of the circuit element is disposed on the connection between the liquid crystal cell and the circuit element so that the connection between the liquid crystal cell and the circuit element does not come off. The pressing member has a function of protecting the circuit element (particularly, its LSI) against an external force applied via the frame in addition to the function of protecting the connection portion as described above.

On the other hand, at least one of the circuit boards is provided with a connector for connecting a liquid crystal display wiring. When connecting the wiring to this connector, a local force is applied to the circuit board. If the connector is located on the back side of the pressing member, the force applied to the circuit board can be received by the pressing member and the frame, and the circuit element can be protected. However, the connector is generally located outside the connection portion between the liquid crystal cell and the circuit element, and as the display device becomes thinner and narrower in frame, the width of the circuit element becomes narrower, and the circuit element and the frame become smaller. Since the spacing is also becoming narrower, the circuit element is easily pressed against the frame by the force applied to the connector, and as a result, an accident that the circuit element is damaged easily occurs. In particular, when the frame is formed of a metal frame, the probability of occurrence of breakage of the circuit element increases.

When a metal frame is used, generally,
This frame is used as a shield case for noise suppression. For that purpose, the work of connecting the lead wire to the frame body and connecting this lead wire to the ground pattern of the circuit board is performed, but the work is troublesome,
There was a problem in assembly workability.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to protect a circuit element against a force applied when a connector is connected. Another object is to improve the assembling workability by using a member used for protection of a circuit element as a member for noise suppression.

[0006]

The present invention provides a liquid crystal cell,
A circuit board arranged on at least one side of the liquid crystal cell, a circuit element for driving liquid crystal arranged to connect the liquid crystal cell to the circuit board, and a metal arranged to cover the circuit board and the circuit element Wherein the circuit board and the frame are electrically connected to each other via a conductive and cushioning spacing member.

The present invention relates to a liquid crystal cell, a circuit board disposed on at least one side of the liquid crystal cell, a circuit element for driving liquid crystal disposed so as to connect the liquid crystal cell and the circuit board, and the circuit board. In a liquid crystal display device including a metal frame disposed so as to cover the circuit element and a connector disposed on the back side of the circuit board, a spacing member having conductivity and buffering properties for the circuit board and the frame is provided. And the spacer is disposed between the front surface of the circuit board and the rear surface of the frame corresponding to the position of the connector.

According to the present invention, an insulating film is adhered to the back surface of the frame, and the insulating film electrically connects the circuit board and the frame via the spacing member having conductivity and cushioning. It is characterized in that it has been partially removed in order to make an electrical connection.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the liquid crystal display device of the present invention will be described below with reference to the drawings. Liquid crystal display device 1
A liquid crystal cell 2, a circuit board 3 arranged on at least one side of the liquid crystal cell 2, and a liquid crystal driving circuit element 4 arranged so as to connect the liquid crystal cell 2 and the circuit board 3.
A frame body 5 disposed so as to expose an effective area of the liquid crystal cell 2 from an opening provided in a central portion and to cover the circuit board 3 and the circuit element 4 with a peripheral frame portion; And a middle frame 7 and a back cover 8 arranged on the back side of the liquid crystal cell 2. The frame 5, the middle frame 7, and the back cover 8 can be made of a synthetic resin. Here, in order to increase the strength, at least the frame 5 and the back cover 8 are made of metal. It is assumed that a metal having good conductivity is used. Further, in this example, the surface light source unit 9 for illuminating the liquid crystal cell 2 is disposed between the middle frame 7 and the back cover 8 in order to configure the liquid crystal display device 1 as a light transmission type. When configured as a mold, the surface light source unit 9 can be omitted.

The liquid crystal cell 2 includes two substrates 2 with transparent electrodes.
A liquid crystal is sealed between the optical elements 1, and optical elements 22 such as a polarizing plate and a phase difference plate are selectively disposed above and below the liquid crystal. A plurality of types of circuit components are arranged on the surface of the circuit board 3, and among them, the circuit element 4 is arranged along one end on the side adjacent to the liquid crystal cell 2 (along the direction perpendicular to the plane of the drawing). ) A plurality are arranged. Frame 5 facing circuit board 3
An insulating film 51 is attached to the back surface of the substrate to prevent a short circuit between the circuit component on the circuit board 3 and the frame 5. The other end of the circuit board 3 opposite to the liquid crystal cell 2 is provided with a first for maintaining a predetermined distance between the circuit board 3 and the frame 5.
And the second spacing member 11 are arranged.
The first spacing member 10 is omitted and the second spacing member 11 is omitted.
Only one can be arranged.

The first and second spacing members 10 and 11 are provided on the circuit element 4 so as to maintain a predetermined spacing between the circuit board 3 and the frame 5 that is greater than the thickness of the circuit element 4. It has a thickness greater than the thickness and a predetermined hardness, and is made of a synthetic resin or the like having a buffering property so as to be able to absorb external force. Second spacing member 11
Is made of, for example, a conductive member having conductivity by adding a predetermined amount of conductive particles to a synthetic resin, and is disposed corresponding to the position of the connector 6 located on the back side of the circuit board 3. That is, it is located just above the connector 6.

The second spacing member 11 on the surface of the circuit board 3
Is provided with a conductive pattern 31 connected to the ground potential. On the other hand, the insulating film 51 attached to the back surface of the frame 5 has a portion corresponding to the second spacing member 11 for electrical connection between the frame 5 and the second spacing member 11. An opening 52 formed by removing a part is provided.

The circuit element 4 is constituted by a film-like circuit board 42 with a liquid crystal driving LSI 41 called TAB or TCP, one end of which is connected to the liquid crystal panel 2 and the other end of which is connected to the circuit board 3 by a conductive member. are doing. The connection portion between the circuit element 4 and the liquid crystal cell 2 includes the first
The third spacing member 12 is arranged in the same manner as the spacing member 10.

As the size of the display device increases and the frame becomes narrower, the length of the circuit board 3 increases while its width (in the horizontal direction in FIG. 1) decreases. Since the distance from the element 4 is also reduced, the connector 6
Of the circuit board 3 by the force applied when the wiring S is connected to the
And the circuit element 4 thereon is easily bent upward. Conventionally, of the plurality of circuit elements 4, the circuit element 4 closest to the connector 6 is pressed against the frame 5 along with the deflection of the circuit board 3, and the driving LSI 41 is broken by the collision with the frame 5. It was easy. In particular, the driving LS with the narrower frame
Since the width of I41 (the left-right direction in FIG. 1) is also very short, breakage of the driving LSI 41 is likely to occur.

However, since the spacing member 11 is disposed between the circuit board 3 and the frame 5 on the back side of the connector 6 as described above, the force applied upwardly in connection with the connection to the connector 6 Can be received by the frame 5 with the spacing member 11 interposed therebetween, and upward deflection of the circuit board 3 can be suppressed. As a result, the circuit element 4 is prevented from being pressed against the frame 5, and the LSI 4
1 can be prevented from being damaged.

The second spacing member 11 is
The second spacing member 11 is also used as a wiring for electrically connecting the frame 5 and the circuit board 3 when the frame 5 functions as a shield case for preventing noise since it has conductivity. Thus, the number of lead wires and components for attaching the lead wires can be reduced as compared with the conventional wiring using lead wires. Further, a second spacing member having conductivity is arranged on the conductive pattern 31 on the circuit board 3,
The metal frame 5 and the circuit board 3 are electrically connected only by mounting the metal frame 5 having good conductivity from above.
Since the metal frame 5 can be held at the ground potential, the number of assembling steps can be significantly reduced as compared with the conventional wiring using lead wires and the like, and the assembling workability can be improved. it can.

[0017]

As described above, according to the present invention, the cushioning spacer is disposed between the circuit board and the frame, so that the force applied at the time of connector connection is applied to the frame via the cushioning spacer. It can be received by the body, and the circuit element connected to the circuit board can be prevented from being damaged.

Further, since the circuit board and the metal frame are electrically connected to each other via the conductive and cushioning spacing member, the electrical connection structure between the circuit board and the metal frame is simplified. In addition to this, the number of steps for the connection work can be reduced, and the workability of assembly can be improved.

In particular, the circuit board and the metal frame are electrically connected to each other via a conductive and cushioning spacing member, and the spacing member is connected between the front surface of the circuit board and the back surface of the frame corresponding to the position of the connector. , The one spacing member can be used also as a protection member for the circuit element and as an electrical connection member to the frame, so that the configuration can be simplified and assembly workability can be improved. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal cell 3 Circuit board 4 Circuit element 5 Frame 6 Connector 9 Surface light source unit 11 Spacing member 31 Conductive pattern 51 Insulating film

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yuichi Tsubaki 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. 8-328030 (JP, A) JP-A-10-253949 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1345 G02F 1/1333 G09F 9/00

Claims (3)

(57) [Claims] And 1. A liquid crystal cell, a circuit board disposed on at least one side of the liquid crystal cell, a circuit element for driving liquid crystal which is arranged to connect the circuit board and the liquid crystal cell, before
Metal made to cover the circuit board and the circuit element
A liquid crystal display device comprising:
And the frame body via a spacing member having conductivity and cushioning property.
And a liquid crystal display device electrically connected to the liquid crystal display device. 2. A liquid crystal cell, a circuit board arranged on at least one side of the liquid crystal cell, a circuit element for driving liquid crystal arranged so as to connect the liquid crystal cell and the circuit board, the circuit board and the circuit In a liquid crystal display device including a metal frame disposed so as to cover an element and a connector disposed on the back side of the circuit board, the circuit board and the frame are connected via a spacing member having conductivity and cushioning. And electrically connect the spacing member to the position of the connector.
Between the front surface of the circuit board and the rear surface of the frame corresponding to the
The liquid crystal display device, characterized in that the location. 3. An insulating film is attached to the back of the frame.
And the insulating film is in front of the circuit board.
The frame is interposed by the spacing member having conductivity and cushioning.
That they have been partially removed for electrical connection
The liquid crystal display device according to claim 1 or 2, wherein
Place.