JP3021813B2 - Display module - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display module used for a liquid crystal display or the like.

[0002]

2. Description of the Related Art As shown in FIG. 2, a display module used for a liquid crystal display device or the like includes a display panel 11, an integrated circuit 13 for supplying a display control signal to the display panel 11 through a TAB tape 12, and an integrated circuit 13 for the display module. A circuit board 14 for inputting and outputting a drive signal of a circuit 13 is assembled in a metal case 15. Here, the circuit board 14 is screwed into the metal case 15
It is supported on a plastic frame 17 fixed by 16 and the circuit board 14 and the metal case 15 are electrically insulated. For this reason, there is a problem in performance such that noise is likely to appear on a display screen formed on the display panel 11 due to the influence of electromagnetic noise or the like generated from an electronic circuit in the module.

As a measure for solving this problem, an electrical connection between the ground pattern of the circuit board 14 and the metal case 15 can be considered. This is due to the result that it is often effective for noise suppression.

For this reason, as shown in FIG.
A configuration in which a portion 15a of the portion 15 is brought into contact with a ground pattern (not shown) of the circuit board 14 by caulking or the like is considered.

However, in this configuration, the contact strength between the swaged portion 15a and the ground pattern tends to vary, and there is a concern about a problem in strength against vibration, impact, and the like.

Further, as shown in FIG. 4, a configuration in which a part 15a of the metal case 15 is electrically connected to the ground pattern by soldering 15b is also conceivable.

With this configuration, it is considered that the number of assembling steps increases, and that it takes a lot of time to disassemble or reassemble the module.

Further, as shown in FIG. 5, a metal spacer 18 is provided between a ground pattern of a circuit board 14 and a fixing screw 16 of a plastic frame 17 and is integrated with the metal case 15 by the fixing screw 16. by tightening the, the configuration of connecting the grayed run de pattern of the circuit board 14 metal case 15 and electrically is also conceivable.

In this case, there are also concerns about problems caused by expansion and contraction of the circuit board 14 and the metal case 15 due to heat, problems with vibration, impact, and the like.

[0010]

As shown in FIG. 3, a portion 15a of the metal case 15 is swaged as shown in FIG. 3, or a portion 15a of the metal case 15 is soldered to the ground pattern as shown in FIG.
15b or, through a metal spacer 18, as shown in FIG. 5, it is conceivable to or clamped together and grayed run de pattern and the metal case 15 of the circuit board 14 by screws 16, the variation of the contact strength Problems, vibration, shock, etc.
There are various problems, such as an increase in labor during reassembly, expansion and contraction due to heat, and the like.

An object of the present invention is to provide the above-described variation in contact strength, vibration, shock, thermal expansion / contraction, assembly man-hours,
To provide a display module in which the effect of noise is reduced by electrically connecting a ground pattern of a circuit board and a metal case without causing a problem regarding disassembly and reassembly. is there.

[0012]

A display module according to the present invention comprises a display panel , an integrated circuit for supplying a display control signal to the display panel , and a ground line connected to the integrated circuit.
A circuit board having a turn, and supporting the display panel
A frame, a metal case for accommodating the display panel, a flexible metal foil conductive connection between the ground pattern and the metal cases of the circuit board, said metal cable
And fix one end of the metal foil
And a screw for integrally fixing the metal case with the metal case .

[0013]

According to the present invention, the frame is fixed to the metal case with screws.
And fix one end of the metal foil integrally with the metal case
And, since the conductive connection by a flexible metal foil between the circuit board grayed run de pattern and the metal case of, it is possible to reduce the display screen noise caused by unwanted electromagnetic noise caused from the electronic circuit, structurally well, A good assembly state can be obtained without problems such as variations in contact strength, vibration, impact, thermal expansion / contraction, assembly man-hours, ease of disassembly / reassembly, and the like.

[0014]

An embodiment of the present invention will be described below with reference to the drawings.

The parts corresponding to those in the conventional example shown in FIGS. 2 to 5 will be described with the same reference numerals.

FIG. 1 shows a display module according to the present invention. This display module has a display panel 11 and a display panel similar to the conventional display module shown in FIG.
An integrated circuit 13 for supplying a display control signal via a TAB tape 12 to an integrated circuit 11 and a circuit board 14 for inputting and outputting a drive signal of the integrated circuit are assembled in a metal case 15. The circuit board 14 is supported on a plastic frame 17 fixed in a metal case 15 by screws 16.

Here, the ground pattern formed on the lower surface of the circuit board 14 and the metal case 15 are conductively connected by a flexible metal foil 19, for example, a copper foil. That is, one end was soldered onto grayed run de pattern of the circuit board 14 of the copper foil 19, the other end, as shown, the inner surface of the metal case 15, and the through portion of the screw 16, the plastic frame 17 It is provided between them and is integrally tightened by screws 16.

The screw 16 is for fixing the plastic frame 17 in the metal case 15.
The plastic frame 17 and the plastic frame 17 each have substantially the same shape as the conventional one shown in FIG. 2, and these can be used as they are.

As described above, since the ground is strengthened by electrically connecting the ground pattern of the circuit board 14 and the metal case 15, noise on the display screen due to unnecessary electromagnetic noise generated from the electronic circuit is obtained. Can be significantly reduced as compared with the related art.

Further, since a flexible metal foil 19 is used for this connection, even if vibration or impact is applied, or thermal expansion or contraction occurs, the metal foil 19 absorbs them even if it occurs. be able to. Therefore, there is no problem in mechanical strength, and the reliability is greatly improved as compared with the related art.

Further, the number of steps for assembling the module does not increase significantly, and the workability, such as the ease of disassembly and reassembly, is improved as compared with the conventional case.

Further, when the module is constructed such that the metal case 15 and the plastic frame 17 are integrally assembled with the screws 16 as in the present embodiment, the electrical connection is made simultaneously with the assembly of the module. Since it can be performed, there is an advantage that the number of man-hours does not increase and that the connection strength varies little.

[0023]

According to the present invention , the metal case is screwed to the metal case.
Fix the frame and attach one end of the metal foil to the metal case.
Integrally fixed to, so became possible electrical connection between grayed run de pattern and the metal case of the circuit board, with reduced display screen noise due to the influence of electromagnetic noise generated from the electronic circuit
Can, vibration and impact, improved reliability against thermal expansion and contraction, kill on improvement of workability in assembly and disassembly, and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a display module of the present invention.

FIG. 2 is a cross-sectional view showing a conventional display module without electrical connection for noise suppression.

FIG. 3 is a cross-sectional view showing a conventional display module in which a part of a metal case is caulked as an electrical connection for noise suppression and connected to a ground pattern of a circuit board.

FIG. 4 is a sectional view showing a conventional display module in which a part of a metal case is soldered to a ground pattern of a circuit board as an electrical connection for noise suppression.

FIG. 5 is a cross-sectional view showing a display module of a conventional example in which a metal spacer is provided between a metal case and a ground pattern of a circuit board as an electrical connection for noise suppression and is integrally fastened with screws.

[Explanation of symbols]

11 Display panel 13 Integrated circuit 14 Circuit board 15 Metal case 16 Screw 17 Plastic frame 19 Metal foil

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/1333 G09F 9/00 309

Claims (1)

(57) [Claims] 1. A display panel , an integrated circuit for supplying a display control signal to the display panel , and a circuit connected to the integrated circuit and having a ground pattern
Substrate and a frame for supporting the display panel, and the metal case that houses the display panel, a ground pattern and the metal cases of the circuit board
A flexible metal foil conductively connecting between said with securing the frame to the metal casing
A screw for fixing one end of the metal foil integrally with the metal case;
A display module , comprising: