JPH03250535A - Flat type display device - Google Patents

Abstract

PURPOSE:To prevent exfoliation of a terminal from a base board for display by securing each connection part of a flexible wiring plate to terminal on the base board, thus providing a device connected, and giving a specified shape to the end terminal of a trains of terminals on the base board. CONSTITUTION:A plurality of terminals 50, 51 are arranged on a base board 11 for display and undergo metal sputtering of chromium, etc. Each connection part 70 of a flexible wiring plate 60 is connected by hot press with terminals 50, 51 and current is fed. The end terminals of a trains of terminals consisting of these terminals 50, 51 assume a form protruding external to the connection part 70 to be put in pressure contact therewith. After hot press contacting, a shearing stress is generated between the two contact surfaces of the terminal 51 and connection part 70 due to difference in the coefficient of thermal expansion between the flexible wiring plate 60 and base board 11, but the terminals 51, 51 are prevented from exfoliating off the base board 11 because of large area of terminals 51, 51, to ensure stable current feeding.

Description

[Detailed Description of the Invention] [Summary] Regarding a flat display device configured to apply a drive signal to an electrode on a display substrate via a flexible wiring board, the present invention relates to a flat display device configured to apply a drive signal to an electrode on a display substrate via a flexible wiring board. A display device with a terminal row consisting of multiple terminals arranged in one direction, with the aim of preventing peeling and increasing the reliability of the electrical connection between the display substrate and the flexible wiring board. In a flat type display device in which a flexible wiring board having a plurality of connection parts corresponding to each of the terminals is fixed to a substrate with each of the terminals and each connection part facing each other, both ends of the terminal row It is characterized in that the terminals arranged in the terminals protrude outward with respect to the connecting portions facing each other.

[Industrial application field]

The present invention relates to a flat display device configured to apply a drive signal to electrodes on a display substrate via a flexible wiring board.

Flexible wiring boards (flexible cables) have a large base advantage and can perform wiring between many terminals at once, so they are suitable for use as a wiring means for flat display devices that are characterized by their thin depth. ing.

[Prior Art] A dot matrix display type plasma display panel (FDP) that displays characters and figures using a combination of light-emitting elements (Dragon element III) uses a pair of glass substrates on the display side and back side as a discharge space. are arranged to face each other, and each discharge cell defined at or near each intersection of band-shaped electrodes arranged in a lattice pattern is configured to selectively discharge.

At the edge of the surface of the glass substrate of the FDP, a terminal row is provided in which terminals corresponding to each of a large number of electrodes led out from the display area are arranged in one direction, and each electrode is connected to a display driving device. A flexible wiring board is fixed.

The flexible wiring board has a plurality of connection parts (wiring board side terminals) corresponding to each terminal of the glass substrate.

Generally, a flexible wiring board is fixed to a glass substrate by thermocompression bonding using a thermosetting resin mixed with an anisotropic conductive material as an adhesive, or by soldering each terminal and each connection part.

In wiring using such flexible wiring boards, due to the difference in thermal expansion coefficient between the glass substrate and the flexible wiring board at both ends of the terminal row, the glass substrate and the flexible wiring Peeling from the board is likely to occur.

Therefore, conventionally, in order to prevent the peeling of the flexible wiring board, as shown in Japanese Patent Application Laid-Open No. 64-28621, connections are placed at both ends of the row of connection parts of the flexible wiring board. A connection structure has been proposed in which the area of the connecting portion is larger than the area of other connecting portions.

[Problem to be solved by the invention]

As described above, if the area of the connecting portions at both ends is increased, the bonding area between the connecting portion and the corresponding terminal on the glass substrate side becomes larger, and the bonding strength between the terminal and the connecting portion increases.

However, conventionally, when the bond between the terminal and the connecting portion is strengthened, there has been a problem that the terminal of the glass substrate becomes easily peeled off from the glass substrate due to thermal expansion and contraction of the flexible wiring board. That is, there is a problem in that the flexible wiring board peels off from the glass substrate at both ends of the terminal row of the glass substrate as if the terminals are peeled off, and the reliability of the electrical connection deteriorates.

In view of the above-mentioned problems, the present invention aims to prevent peeling of terminals provided on a glass substrate or the like and to improve reliability of electrical connection between a display substrate and a flexible wiring board.

[Means to solve the problem]

In order to solve the above-mentioned problems, the display device according to the present invention has the following features:
As shown in FIG. 1, a plurality of terminals 5 arranged in one direction
Display substrate 11.1 provided with a terminal array consisting of 0.51
2, a flat type flexible wiring board 60 having a plurality of connection parts 70 corresponding to each of the terminals 50, 51 is fixed with each of the terminals 50, 51 and each connection part 70 facing each other; In the display device 1, the terminals 51 arranged at both ends of the terminal row protrude outward with respect to the connecting portions 70 facing each other.

[For production]

The terminals 51 arranged at both ends of the terminal row protrude outward with respect to the connecting portions 70 facing each other. That is,
The edge of the connecting portion 70 is located further inward than the edge of the terminal 51 (towards the center of the terminal row).

Therefore, the adhesion force between the portion of the terminal 51 protruding from the connecting portion 70 and the display substrate 11.12 counteracts the force that tries to peel off the terminal 51 from the display substrate 11.12, and the terminal 51 and the display substrate 11.12 are Peeling from the substrates 11 and 12 becomes less likely to occur.

〔Example〕

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

FIG. 2 is a perspective view showing the PDPI according to the present invention, and FIG. 3 is a diagram showing the electrode structure of the PDPI.

In FIG. 2, PDP I has a glass substrate 1 on the display side.
1. Glass substrate 12 on the back side, and each glass substrate 11.
12, and a mixed gas for discharge is sealed in the gap between the glass substrates 11 and 12, which face each other. The upper surface of the glass substrate 11 in FIG. 2 becomes the display surface lIF.

As shown in FIG. 3, on the surface of each glass substrate 1112, Xi electrodes 1 are arranged parallel to each other with predetermined electrode pinches within the display area El surrounded by the sealing glass 17.
3 and Yl poles 14 are arranged, respectively, and terminal rows are provided on the outer edge portions on both sides of each glass substrate 11.12 to be connected to a flexible cable 60 (not shown in FIG. 3). Each terminal row consists of terminals 50 connected to the X electrode 13 or Yt electrode 4, and dummy terminals 51 arranged at both ends of the terminal row.

In the PDP 1, in order to prevent short circuits, the terminals 50 are arranged in such a way that there is sufficient space between each terminal 50.
Each glass substrate 11.1 is alternately inserted every few electrodes 13.14.
They are distributed and provided on the outer edge portions of both sides of 2.

Note that each terminal row may be formed at the same time as the X electrode 13 or the Yt electrode 4, which is formed by patterning a three-layer metal film of chromium (Cr), W4 (Cu), and Cr laminated by sputtering deposition, for example. However, it may be formed separately. Further, in order to ensure the connection with the flexible cable 60, plating treatment may be performed.

FIG. 1 is a cross-sectional view showing a main part of a PDP 1 according to the present invention, and shows an enlarged view of a connecting portion between a glass substrate 11 or a glass substrate I2 and a flexible cable 60.

In PDP 1, the width DI of each terminal 50 in the terminal row
is, for example, about 0.3 mm, and the mutual interval d1 between the terminals 50 arranged in the direction of arrow M1 is about 0.3 mm. Further, the width D2 of each dummy terminal 51 is approximately 4 mm, and the distance d2 between each dummy terminal 51 and the terminal 50 is 0.
．． It is said to be about 6 mm.

On the other hand, the flexible cable 60 is, for example, a polyimide plate provided with a connecting portion 70 corresponding to a row of terminals on one side.

In the PDP 1, the width of the connecting portion 70 is approximately the same as the width D1 of the terminal 500, and the arrangement pitch of the connecting portion 70 is equal to the arrangement pitch of the terminal rows. Therefore, the dummy terminal 51 is wide with respect to the connecting part 70 facing it, and the outer end 51a of the dummy terminal 51 is a distance G1 outward of the terminal row with respect to the outer end 70a of the connecting part 70. Only the dummy terminal 5 sticks out.
The inner end 51b of 1 is connected to the inner end 70b of the connecting portion 70,
A distance #lG is placed inward of the terminal row (center side in direction M1).
Only 2 stands out.

The connection and fixation between the glass substrate 11 and the flexible cable 60 in the PDP 1 configured as above is as follows.
The glass substrate 11 and the flexible cable 60 are faced to each other via a thermosetting resin layer (not shown) containing an anisotropic conductive material, and a bonding tool heated to about 200° C. is pressed against the flexible cable 60 side to perform thermocompression bonding. .

When the temperature returns to room temperature after thermocompression bonding, the flexible cable 60 has a larger coefficient of thermal expansion than the glass substrate 11, so the flexible cable 60 contracts more than the glass substrate 11, and stress is generated between them. This stress is applied to the flexible cable 6 due to the high rigidity of the glass substrate 11.
At the interface between the glass substrate 11 and the glass substrate 11, it acts as a shear core force, and especially at both ends, it also acts as a tensile stress. Therefore, a force appears on the dummy terminals 51 at both ends of the glass substrate 11 that tends to peel off the dummy terminals 51 from the glass substrate 11.

However, as described above, in PDPI, since the area of the dummy terminal 51 is large, the bonding force between the dummy terminal 51 and the glass substrate 11 is large and it is difficult for the dummy terminal 51 to peel off. Since the dummy terminal 51 protrudes from the outer end 70a, the tensile stress generated in the dummy terminal 51 is greatest in the central part, and
Therefore, the dummy terminal 51 does not peel off from its outer end 51a, and the dummy terminal 51 hardly peels off from the glass substrate 11.

In fact, when we conducted a temperature cycle durability test in which we were exposed to temperatures of 70°C and -20°C alternately without creating a temperature gradient, peeling occurred after 4 cycles in the conventional case, but
It was confirmed that the PDP 1 of this example had durability of 10 cycles or more.

FIG. 4 shows P D P 1 according to another embodiment of the present invention.
It is a sectional view showing the main part of B. In this figure, components having the same functions as those in FIG. 1 are given the same reference numerals.

In the PDPIB, the connecting portions 70B are arranged such that only the outer end 51a of the dummy terminal 51 protrudes from the connecting portion 70B of the flexible cable 60B. Therefore, in the PDP IB, separation between the dummy terminal 51 and the glass substrate 11 due to shrinkage of the flexible cable 60 can be prevented.

In the above embodiment, the dummy terminals 51 which have no function on the electric circuit are provided at both ends of the terminal row, but instead of the dummy terminals 51, terminals used for display or aging may be provided. can.

[Effects of the Invention] According to the present invention, peeling of terminals provided on a glass substrate or the like can be prevented, and reliability of electrical connection between a display substrate and a flexible wiring board can be improved. I can do it.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the main parts of a PDP according to the present invention, FIG. 2 is a perspective view showing an FDP according to the present invention, and FIG. 3 is a PDP according to the present invention.
FIG. 4 is a cross-sectional view showing a main part of an FDP according to another embodiment of the present invention. In the figure, 1.1B is an FDP (flat display device), 11, .
12 is a glass substrate (display substrate), 50 is a terminal, 51 is a dummy terminal (terminal), 60 is a flexible cable (flexible wiring board), 70 is a connecting portion, and L is a terminal row. 198

Claims (1)

[Claims] (1) Multiple terminals (50) (51) arranged in one direction
A display substrate (11) provided with a terminal row (L) consisting of (1)
2), a flexible wiring board (60) having a plurality of connection parts (70) corresponding to each of the terminals (50) and (51).
), each terminal (50) (51) and each connection part (70)
A flat display device (
In 1), the terminals (51) arranged at both ends of the terminal row (L) are connected to the connecting portion (70) facing each other.
A flat display device characterized by protruding outward from the display.