JPH07245493A - Shield structure of display unit - Google Patents

Abstract

PURPOSE:To provide a display unit shield structure which does not necessitate a separate member for shielding and can be easily mounted. CONSTITUTION:A window 8 for LCD display part is provided on a mounting board 31 mounted on the front panel 1 of a display unit, and a conductive pattern 41 for shielding is provided in loop around the window 8 of the mounting board 31. Then, an LCD module 2 is mounted on the window 8 for the LCD display part from the rear plane of the mounting board 31. A shielding conductive pattern is provided on the whole plane except on the window 8 on the mounting board, and not only the LCD module but also components such as LED and switch can be shielded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure for a display unit in which an LCD (liquid crystal display unit, hereinafter referred to as LCD) is mounted.

[0002]

2. Description of the Related Art An LCD module unit equipped with an LCD is apt to malfunction when an induction magnetic field such as static electricity or radiated electromagnetic field noise is applied from the outside, causing display errors such as garbled characters. For this reason, LE can be used with a metal plate or transparent conductive sheet.
The D section is shielded to deal with the above-mentioned induced magnetic field and radiated electromagnetic field noise.

FIG. 3 is a view showing a conventional shield structure. In FIG. 3, 1 is a front panel, 2 is an LCD module, 3 is a main board of a display unit, 4 is a shield part, 5 is an LCD module and a main board. A connecting terminal for connecting between 3 and an LED. As shown in the figure, conventionally, when the LCD module 2 is mounted on a display unit or an operation panel, the component mounting surface (front surface) of the main board 3 is mounted.
The LCD module 2 was attached in a two-stage structure, and the connection module 5 connected between the LCD module and the main board.

In order to prevent malfunction of the LCD module due to induced magnetic field or radiated electromagnetic field noise, the shield portion 4 is formed on the front panel side of the LCD module with a metal plate or a transparent conductive sheet. In the above structure, since the LCD module has a two-stage structure, the LCD module portion becomes thick.

Therefore, when there is a limit on the thickness, FIG.
The structure shown in was used. 4, the same parts as those shown in FIG. 3 are designated by the same reference numerals,
1 is a front panel, 2 is an LCD module, 31 is a main substrate of a display unit, 4 is a shield part, 54 is a connection cable for connecting between the LCD module and the main substrate 31,
6 is an LED.

As shown in the figure, when the thickness is limited, the LCD module 2 and the main board 31 are separated, both are mounted on the same board mounting surface, and a connecting cable 54 is connected between them to reduce the thickness. I was trying to make it.

[0007]

By the way, since the mounting structure shown in FIG. 3 is a two-stage structure, the thickness becomes thicker. Moreover, in order to shield the LCD module, a metal plate, a transparent conductive sheet, or the like is used. Need to be provided on the front panel side of the LCD module, and there is a problem in terms of mounting and cost such as an increase in the number of parts.

Further, the structure shown in FIG. 4 can be made thinner than that of FIG. 3, but similarly to the above, a metal plate, a transparent conductive sheet or the like is required, and the number of parts is increased. There is a problem in terms of cost. The present invention has been made in consideration of the above-mentioned problems of the prior art, and provides a shield structure for a display unit that does not require a separate shield member and can be easily mounted. To aim.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present invention, as shown in FIG.
In the shield structure of the display unit including the CD module 2, the mounting substrate 31 mounted on the front panel 1 of the display unit is provided with the window hole 8 for the LCD display portion, and the mounting substrate 31 is provided with the window hole 8 around the window hole 8. The shield conductive pattern 41 connected to the frame ground or the signal ground is provided in a loop shape, and the LCD module 2
Is attached to the window hole 8 for the LCD display portion from the back surface of the mounting substrate 31.

According to a second aspect of the present invention, as shown in FIG. 2, in the shield structure of the display unit including the LCD module 2, the LCD display unit is mounted on the mounting substrate 32 attached to the front panel 1 of the display unit. And a window hole 8 for mounting components, and the mounting board 32 described above.
The shield conductive pattern 42 connected to the frame ground or the signal ground is provided on the entire surface excluding the window hole 8 of the LCD module 2 in the window hole 8 for the LCD display portion and the back surface of the mounting substrate 32. It was installed from.

According to a third aspect of the present invention, in the second aspect of the invention, the window hole 8 for mounting the component is used for positioning when mounting the component. According to a fourth aspect of the present invention, in the first, second or third aspect of the invention, the mounting substrates 31 and 32 on which the conductive patterns 41 and 42 for shielding are provided are formed by a flexible printed circuit. .

[0012]

According to the first aspect of the present invention, the mounting board 31 attached to the front panel 1 of the display unit has the L
The window hole 8 for the CD display portion is provided, the shield conductive pattern 41 connected to the frame ground or the signal ground is provided in a loop shape around the window hole 8 of the mounting substrate 31, and the LCD module 2 is Since it is attached to the window hole 8 for the LCD display portion from the back surface of the mounting substrate 31, the LCD module can be shielded without separately providing a shielding member.

Further, since the LCD module is attached from the back surface of the mounting board, it is possible to make the device thinner, and further, it is possible to mount the assembly by assembling the mounting board and the LCD module on the entire panel. It can be done easily. According to the second aspect of the present invention, the mounting substrate 32 mounted on the front panel 1 of the display unit is provided with the window holes 8 for the LCD display part and the component mounting, and the window of the mounting substrate 32. Provide a shield conductive pattern 42 connected to the frame ground or the signal ground on the entire surface except the hole 8.
Since the LCD module 2 is attached to the window hole 8 for the LCD display section from the back surface of the mounting substrate 32, not only the LCD module but also the LE provided in the display unit is provided.
Parts such as D and switches can be shielded. Further, similarly to the first aspect of the invention, it can be made thin, and it can be mounted only by attaching the assembly of the first substrate and the LCD module to the entire panel, and the mounting can be easily performed.

According to the invention of claim 3 of the present invention, in the invention of claim 2, since the window hole 8 for mounting the component is used for positioning when mounting the component, the component can be easily placed at a predetermined position. Can be installed. In the invention of claim 4 of the present invention, in the invention of claim 1, 2 or 3, the conductive patterns for shield 41, 42 are provided.
Since the mounting boards 31 and 32 provided with are formed by the flexible printed circuit, they can be applied to display units of various shapes such as those having a curved surface.

[0015]

FIG. 1 is a diagram showing a first embodiment of the present invention, in which FIG. 1 (a) shows a side view of a display unit, and FIG. 1 (b) shows a front view of the display unit. (The state which removed the front panel) is shown. In the figure, 1
Is a front panel, 2 is an LCD module, 31 is a main substrate of the display unit, and the front panel side of the main substrate 31 has a shield around the window hole portion 8 of the LCD module 2 as shown in FIG. A conductive pattern 41 for shield is provided, and the conductive pattern 41 for shield is connected to FG (frame ground) or SG (signal ground).

Further, the LED 6, the switch 9 and the like are attached to the portion other than the shield conductive pattern 41 of the main board 31 and the wiring pattern 7 is provided, and a connection terminal is provided between the main board 31 and the LCD module 2. Connected by 5. As described above, in this embodiment, a window hole for LCD display is provided on the main substrate 3, and a shield conductive pattern is provided in a loop shape around the window hole.
Since the LCD module is mounted from the back side of the main board, there is no need to provide a shield member separately.
The CD module can be shielded.

Further, as shown in FIG. 3, since it does not have a two-stage structure, it can be made thin, and further, the first
It can be mounted simply by attaching the assembly of the substrate and the LCD module to the entire panel, and as shown in FIG. 4, it is not necessary to connect the LCD module and the main substrate with the connection cable 54, so that the mounting is easy. is there. Figure 2
Is a second embodiment of the present invention. This embodiment shows an embodiment in which not only the LCD module but also LEDs, switches and the like are entirely shielded. FIG. 7A is a side view of the display unit, and FIG. The figure seen from (the front panel is removed) is shown.

In the figure, 1 is a front panel, 2 is an LC
D module, 32 is the first substrate, and the first substrate 3
As shown in FIG. 2B, on the front panel side of FIG. 2, a conductive pattern for shielding is provided on the entire surface except for the display window hole 8, the mounting portions of the connection terminals 51 and 52, and the window hole 8 for mounting LEDs, switches and the like. 42 is provided, and the shield conductive pattern 4 is provided.
2, 2 is connected to FG (frame ground) or SG (signal ground).

Reference numeral 33 is a second substrate on which the LEDs 6 and the like are mounted, and the second substrate 33 and the LCD module 2 have connection terminals 51 and a wiring pattern 53 on the first substrate [FIG. 2 (b)].
Reference], and is connected via the connection terminal 52. As described above, in this embodiment, the shield conductive pattern 42 is provided on the entire surface of the first substrate excluding the window hole, and the LCD module 2 and the second substrate, which is the main substrate, are provided from the back surface of the first substrate. Since the board 33 is attached, not only the LCD module but also parts such as LEDs and switches provided in the display unit can be shielded.

Further, like the first embodiment, it can be made thin, and it can be mounted simply by attaching the assembly of the first substrate and the LCD module to the entire panel, and the mounting is easy. Further, window holes for mounting LEDs, switches and the like are provided on the first substrate, which can be used for positioning when mounting components.

In the above embodiment, as the substrate on which the conductive pattern for shielding is provided, an ordinary printed board can be used, but an FPC (flexible printed circuit) can also be used.

[0022]

As described above, the following effects can be obtained in the present invention. In the invention of claim 1, a shield conductive pattern connected to the frame ground or the signal ground is provided around the window hole of the mounting substrate in a loop shape, and L
Since the CD module is attached to the window hole for the LCD display portion from the back surface of the mounting substrate, the LCD module can be shielded without separately providing a shield member.

Further, since the LCD module is attached from the back surface of the mounting board, it is possible to make the device thinner, and further, it is possible to mount the assembly by assembling the mounting board and the LCD module on the entire panel. It can be done easily. According to the second aspect of the present invention, the shield conductive pattern connected to the frame ground or the signal ground is provided on the entire surface of the mounting substrate excluding the window hole, and the LCD is provided.
Since the module is attached to the window hole for the LCD display section from the back surface of the mounting substrate, not only the LCD module but also the parts such as LEDs and switches provided in the display unit can be shielded. Further, similarly to the above, the device can be made thin, and it can be mounted simply by attaching the assembly of the first substrate and the LCD module to the entire panel, which facilitates the mounting. According to the invention of claim 3, in the invention of claim 2, the window for mounting the component is used for positioning when mounting the component, so that the component can be easily mounted at a predetermined position. According to the invention of claim 4, in the invention of claim 1, 2 or 3, the mounting substrate on which the conductive pattern for shielding is provided is formed by a flexible printed circuit, and therefore, it is applied to display units of various shapes. be able to.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a conventional example.

FIG. 4 is a diagram showing a conventional example.

[Explanation of symbols]

1 Front Panel 2 LCD Module 31 Main Substrate 32 First Substrate 33 Second Substrate 41, 42 Shield Conductive Pattern 51, 52 Connection Terminal 53 Wiring Pattern 52 Connection Terminal 6 LED 7 Signal Pattern 8 Window Hole 9 Switch

Claims (4)

[Claims] 1. A shield structure for a display unit including an LCD module (2), wherein a mounting board (31) attached to a front panel (1) of the display unit is provided with a window hole (8) for an LCD display section. Also, the shield conductive pattern (41) connected to the frame ground or the signal ground is provided in a loop shape around the window hole (8) of the mounting substrate (31) to display the LCD module (2) on the LCD display. A shield structure for a display unit, characterized in that it is attached from the back surface of the mounting board (31) to the window hole (8) for parts. 2. In a shield structure for a display unit including an LCD module (2), a mounting board (32) mounted on a front panel (1) of the display unit has windows for LCD display section and parts mounting. A hole (8) is provided, and a shield conductive pattern (42) connected to the frame ground or signal ground is provided on the entire surface of the mounting board (32) excluding the window hole (8). 2) The shield structure of the display unit, wherein 2) is attached to the window hole 8 for the LCD display section from the back surface of the mounting substrate 32. 3. The shield structure for a display unit according to claim 2, wherein the window hole (8) for mounting the component is used for positioning when mounting the component. 4. The display unit according to claim 1, wherein the mounting substrate (31, 32) on which the conductive pattern (41, 42) for shielding is provided is formed by a flexible printed circuit. Shield structure.