JP2701563B2 - External lead connection board mounting structure of display element - Google Patents

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 an external lead connection board of a display device, and more particularly to a flexible external lead connection board mounting structure.

[0002]

2. Description of the Related Art An example of connection of external leads in a conventional display device is shown in FIG. Here, the connection between the rear electrode terminal of the plasma display panel and the flexible substrate is taken as an example.

The flexible substrate 16 has one signal wiring layer 4 and leaves a connection terminal portion with the plasma display panel 11, and both ends thereof are insulating layers 3 and 5 made of polyimide or the like.
Covered with. The signal wiring layer 4 is formed so as to be able to make a one-to-one connection with a plurality of terminals of the rear electrode 9 of the plasma display panel 11. The connection between the signal wiring layer 4 and the rear surface electrode 9 is made by various methods such as anisotropic conductive film, soldering, press-fitting with a clip or the like.

[0004]

In recent years, as the market demand for a large-capacity, high-definition display device has increased, the number of connection terminals of the display element has increased, and a high-speed switching element has been required to cope with the number of terminals. Are being used in drive circuits.

[0005] On the other hand, awareness of the problem of electromagnetic radiation noise of electronic equipment has increased, and regulations have become stricter. Therefore, various measures have been indispensable from electronic circuits to mechanical structures.

However, in the above-mentioned conventional display device,
From the external lead connection board to the display area, no measures against radiation noise have been taken into consideration, so that consideration must be given to the display device housing to have a shielding effect.

[0007]

According to the present invention, in connection between a display element and an external lead connection board, a wiring layer of the external lead connection board has a two-layer structure, and a first layer of the wiring layer is connected to terminals of the display element. The entire surface of the connection wiring layer and the second layer is a ground layer or a radio wave absorbing film layer, and the second layer is extended from the terminal portion of the display element and extended to the vicinity of the display area.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a connecting portion according to a first embodiment of the present invention,
FIG. 2 is a diagram of this embodiment viewed from the display surface side. The display element is an XY matrice type plasma display,
The gap at the intersection of the transparent front electrode 8 and the rear electrode 9 is a discharge space, that is, a display cell. In the present embodiment, the flexible substrate 6 connected to the rear electrode 9 has two layers of the ground pattern layer 2 made of metal such as copper and the signal wiring layer 4.
The ground pattern layer 2 has a solid pattern over the entire upper surface of the signal wiring layer 4 via the insulating layer 3, and further extends to the end of the display area to cover the rear electrode 9. Therefore, the high frequency components on the signal wiring are absorbed by the ground pattern layer,
Radiated noise is reduced.

FIG. 3 is a sectional view of a second embodiment of the present invention. This embodiment is an example in which the flexible substrate 6 is connected to the transparent front electrode 8 of the plasma display panel 11. Unlike the first embodiment, the front glass plate 7 extends beyond the rear glass plate 10, so that the signal The connection direction between the wiring layer 4 and the transparent front electrode 8 is opposite to that of the first embodiment.

FIG. 4 shows an example of a display device constructed by combining the first embodiment and the second embodiment. The scanning-side driving circuit board a (14) and the scanning-side driving circuit board b are provided on the rear electrodes.
(15), and the data-side drive circuit board a (12) and the data-side drive circuit board b (13) are connected to the transparent front electrode. For example, the second embodiment is used for the connection on the transparent front electrode side.

[0011]

As described above, according to the present invention, the ground pattern layer is provided on the external lead connection board and the ground pattern layer is extended to the vicinity of the display area. It has the effect of absorbing and reducing radiated noise levels.

Further, in the external lead connection board of the embodiment described above, the same effect can be obtained by replacing the ground pattern layer with a radio wave absorbing film layer using an amorphous magnetic material or ferrite.

[Brief description of the drawings]

FIG. 1 is a sectional view of a connecting portion according to a first embodiment of the present invention.

FIG. 2 is a view of the first embodiment shown in FIG. 1 as viewed from the display surface side.

FIG. 3 is a sectional view of a connection portion according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing a display device configured by combining the first embodiment and the second embodiment.

FIG. 5 is a cross-sectional view of a connection portion in a conventional display device.

[Explanation of symbols]

 1, 3, 5 Insulating layer 2 Ground pattern layer 4 Signal wiring layer 6 Flexible substrate 7 Front glass plate 8 Transparent front electrode 9 Rear electrode 10 Rear glass plate 11 Plasma display panel 12 Data side drive circuit board a 13 Data side drive circuit board b 14 scanning-side driving circuit board a 15 scanning-side driving circuit board b 16 display area

Claims (1)

(57) [Claims] 1. A connection between a display element and a flexible external lead
In the connection of the substrate , the wiring layer of the flexible external lead connection substrate has a two-layer structure, the first layer of the wiring layer is a connection wiring layer to the terminal of the display element, and the entire surface of the second layer is a ground layer or An external lead connection board mounting structure for a display element, wherein the second layer is extended from a terminal portion of the display element and protrudes to the vicinity of a display area.