JPH06250199A - Display device - Google Patents

Abstract

PURPOSE:To simultaneously inspect the connective conditions of a wiring boards and between the wiring board and substrate, and to provide the durability for repeated inspections by electrically connecting the flexible wiring board loading a driving IC to a display pannel and electrically connecting a wiring substrate impressing a signal to the driving IC to the wiring board. CONSTITUTION:The terminals 8, 9 for inspection are connected to relay terminals 15, 16 respectively through an anisotropy conductive film, etc., according to the connections between the electrode terminal 7 of a pannel 1 and the output terminal 10 of the flexible wiring board 2. Similarly, the relay terminals 18, 19 are connected to the terminals 21, 22 for inspection according to the connection between the input terminal 17 of the flexible wiring board 2 and the electrode terminal 20 of the common wiring substrate 3. In such a manner, since power is supplied through the connective positions between the liquid crystal pannel 1 and the flexible wiring board 2 and between the flexible wiring board 2 and the common wiring substrate 3, these connective conditions are inspected simultaneously based on the electric resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device. More specifically, a flexible wiring board having a driving IC for driving the panel electrically connected to a display panel having electrode terminals on the peripheral edge of one surface such as a liquid crystal panel and an EL (electroluminescence) panel, The present invention relates to a display device in which a wiring board for applying a signal to the driving IC is electrically connected to the flexible wiring board.

[0002]

2. Description of the Related Art As a display device of this type, for example, a liquid crystal display device as shown in FIGS. 3 and 4 is known (see FIG. 3).
Shows a peripheral portion of the liquid crystal display device viewed perpendicularly to the panel surface, and FIG. 4 schematically shows a cross section of the liquid crystal display device. ). As shown in FIG. 3, this liquid crystal display device includes a liquid crystal panel 101, a flexible wiring board 102 on which a driving IC 104 for driving the panel 101 is mounted,
The common wiring board 103 is provided. As shown in FIG.
The liquid crystal panel 101 is configured by enclosing the liquid crystal 132 in the gap between the glass substrates 130 and 131, and the electrode terminal 10 formed of a thin film along the side 131a at the peripheral edge of the glass substrate 131.
Many 7 are arranged. Flexible wiring board 102
On one side 102b and the other side 102c of the substrate surface 102a,
Output terminals 110 connected to the driving IC 104,
An input terminal 117 is provided and configured. Further, the common wiring board 103 has a large number of electrode terminals 120 arranged on one surface. In the mounted state, the panel 101 (the glass substrate 13
1) and the common wiring substrate 103 are provided with respective electrode terminals 1
07 and 120 are arranged so as to face upward, and the electrode terminals 107 and 120 are respectively provided with an anisotropic conductive film 105 (as shown in FIG. 5 in which conductive particles 106 are dispersed in resin 105a). , Corresponding flexible wiring board 102
Is connected to the output terminal 110 and the input terminal 117.

Conventionally, as shown in FIG. 6 (a), in the peripheral portion of the glass substrate 131, a strip shape is formed on both sides of the electrode terminals 107, ..., 107, whose longitudinal direction is perpendicular to the side 131a of the glass substrate 131. The inspection terminals 108 and 109 are provided in pairs. The inspection terminals 108 and 109 are connected to the pads 108a and 109a provided on the sides thereof via the wirings 114 and 116 extending along the side 131a, respectively. On the other hand, the flexible wiring board 102 is provided with a pair of strip-shaped inspection terminals 112, 113 corresponding to the inspection terminals 108, 109 of the glass substrate 131 on both sides of the output terminals 110 ,. (Note that the inspection terminal is not provided on the input terminal side 102c of the flexible wiring board 102.). Inspection terminal 11
2, 113 are connected to each other by a wiring 118 extending along the column of the output terminals 110 ,. In the mounted state, the inspection terminal 10 is connected via the anisotropic conductive film 105 with the connection between the electrode terminal 107 of the glass substrate 131 and the output terminal 110 of the flexible wiring board 102.
8 and 112, and inspection terminals 109 and 113 are connected, respectively. When inspecting the connection state between the panel 101 (glass substrate 131) and the flexible wiring board 102, the pad 1
08a and 109a are brought into contact with a probe, for example, wiring 1
14, the inspection terminals 108 and 112, the wiring 118, the inspection terminals 113 and 109, and the wiring 116 are sequentially passed through to energize. Thereby, the electric resistance is measured, and the quality of the connection state is determined based on the electric resistance value.

[0004]

However, in the above-described conventional display device, the flexible wiring board 102 and the common wiring board 103 are not provided with the inspection element on the input terminal 117 side of the flexible wiring board 102. The connection status cannot be confirmed. As a result, there is a problem that a defective product flows to a post process, the product yield is reduced, and the manufacturing cost is increased. Since the pads 108a and 109a are provided on the glass substrate 131, the electrode terminals 107
It is formed of the same thin film as the above material. Therefore, when repeatedly inspecting the connection state, there is a problem that the pads 108a and 109a are immediately damaged due to contact with the probe and poor in durability. Further, on the glass substrate 131, the inspection terminals 108 and 109 and the pads 108a and 109a are formed on the side 131.
Since they are arranged along a, a large space is taken in this direction, and as a result, there is a problem in that a sufficient space for the electrode terminal 107 cannot be secured.

Therefore, an object of the present invention is to simultaneously inspect a connection state between a display panel, a wiring board for transmitting a signal to the display panel, and a board for supplying a signal for driving the display panel, Another object of the present invention is to provide a display device that has durability against repeated inspections and can expand the space for the electrode terminals at the peripheral portion of the panel.

[0006]

In order to achieve the above object, a display device of the present invention is provided with a plurality of first electrode terminals arranged in a peripheral portion of one surface along a side so as to ride on an imaginary line. A display panel, a substrate having a plurality of second electrode terminals arranged on one surface so as to ride on a virtual line, and the first and second electrodes on one side and the other side of the one surface, respectively. A wiring board having an output terminal and an input terminal arranged corresponding to the terminal, the first electrode terminal of the display panel and the output terminal of the wiring board, the second electrode terminal of the substrate and the wiring A display which is electrically connected to an input terminal of a board and which transmits a signal supplied from a second electrode terminal of the board to the first electrode terminal of the display panel via an input terminal and an output terminal of the wiring board. In the device, the display panel includes the peripheral portion of the display panel. A pair of strip-shaped first inspection terminals, which are provided so as to ride on an imaginary line and whose longitudinal direction is perpendicular to the sides of the peripheral portion, and the first inspection terminals, which extend in parallel to the sides, A pair of second inspection terminals, each having a first wiring to be connected, provided so as to ride on the imaginary line on the one surface, and having a longitudinal direction perpendicular to the imaginary line; The wiring board has a pair of pads and a pair of second wirings for individually connecting the pads and the second electrode terminals. The wiring board is provided on the one side of the output terminal side, A pair of first relay terminals corresponding to the first inspection terminals, and a pair of second relay terminals provided on the one side of the input terminal side and corresponding to the second inspection terminals of the substrate; A pair of third wirings for individually connecting the first relay terminal and the second relay terminal are provided. It is characterized in Rukoto.

[0007]

In the mounted state, when the first electrode terminal of the display panel and the output terminal of the wiring board are connected, the first inspection terminal of the display panel and the wiring board are connected via the anisotropic conductive film or the like. First
Is connected to the relay terminal. Similarly, with the connection between the input terminal of the wiring board and the second electrode terminal of the board, the second relay terminal of the wiring board and the second inspection terminal of the board are connected. When inspecting the connection state, the probe is brought into contact with the pair of pads on the substrate. Then, from one of the pads on the substrate, the second wiring, the second inspection terminal, the second relay terminal of the wiring board, the third wiring, the first relay terminal, the first inspection of the display panel. One of the terminals for use, the first wiring, the first
Of the inspection board, the first relay terminal of the wiring board, the third wiring, the second relay terminal, the second inspection terminal of the board, and the second wiring are sequentially passed through the board. The other side of the pad is energized. Thereby, the electric resistance is measured. In this way, since electricity is supplied through the connection points between the display panel and the wiring board and between the wiring board and the substrate, the connection state between the display panel and the wiring board and the wiring board and the substrate is simultaneously inspected based on the electric resistance. .

Further, since the above-mentioned pad is provided on the substrate, unlike the case where it is provided on the display panel, it is easily formed by a relatively thick material such as copper. Therefore, durability against repeated inspection is improved.

Further, since the pad is provided on the substrate, the first pad is provided as compared with the case where the pad is provided on the display panel.
The space for the electrode terminal of is expanded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The display device of the present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows a main part of a liquid crystal display device of one embodiment (the schematic structure is the same as that shown in FIGS. 3 and 4). This liquid crystal display device is a flexible wiring board having a liquid crystal panel 1 as a display panel as shown in FIG. 1A and a driving IC 4 for driving the panel 1 as shown in FIG. 1B. 2 and a common wiring board 3 for supplying a signal to the driving IC 4 as shown in FIG.

At the peripheral edge of the glass substrate 31 of the panel 1,
A large number of first electrode terminals 7, ... Are arranged along the side 31a (in the figure (a), the dotted line represents a virtual line on which the electrode terminal 7 rides). At both ends of the row of the first electrode terminals 7, a pair of strip-shaped first inspection terminals 8 and 9 whose longitudinal direction is perpendicular to the side 31a are provided. The first inspection terminals 8 and 9 are connected at their ends opposite to the side 31a by a first wiring 13 extending parallel to the side 31a.

The common wiring board 3 has a large number of second side surfaces 3a.
Are arranged (the dotted line represents an imaginary line on which the electrode terminal 20 rides). This second
A pair of strip-shaped second inspection terminals 21 and 22 whose longitudinal direction is perpendicular to the virtual line are provided at both ends of the row of the electrode terminals 20. Also, the back surface 3b of the common wiring board 3
Corresponding to the inspection terminals 21 and 22, the pads 21a,
22a are provided in pairs. The pads 21a, 22a and the second electrode terminals 21, 22 are individually connected by a pair of second wirings 23, 24 passing through the peripheral edge of the substrate 3.

The flexible wiring board 2 is constructed by providing output terminals 10, ..., Input terminals 17, ... Connected to the driving IC 4 on one side 2b and the other side 2c of the substrate surface 2a. The output terminal side 2b is provided with a pair of first relay terminals 15 and 16 corresponding to the first inspection terminals 8 and 9 of the panel 1, while the input terminal side 2c is provided with the common wiring board 3 A pair of second relay terminals 18 and 19 corresponding to the second inspection terminals 21 and 22 are provided. In addition, the first relay terminals 15 and 16 and the second relay terminals 18 and 1
9 is individually connected by a pair of third wirings 11 and 12.

In the mounted state, as the electrode terminals 7 of the panel 1 and the output terminals 10 of the flexible wiring board 2 are connected,
The inspection terminals 8 and 9 and the relay terminals 15 and 16 are connected to each other through an anisotropic conductive film or the like. Similarly, as the input terminal 17 of the flexible wiring board 2 and the electrode terminal 20 of the common wiring board 3 are connected, the relay terminals 18 and 19 and the inspection terminals 21 and 22 are connected to each other. When inspecting the connection state, the pair of pads 21a,
The probe is brought into contact with 22a. Then, for example, the pad 21a to the wiring 23, the inspection terminal 21, the relay terminal 18 of the flexible wiring board 2, the wiring 11, the relay terminal 15, the inspection terminal 8 of the panel 1, the wiring 13, the inspection terminal 9, the flexible wiring board 2 Relay terminal 16, wiring 12, relay terminal 1
9, the inspection terminal 22 of the common wiring board 3 and the wiring 24 are sequentially passed through the pad 22a. Thereby, the electrical resistance is measured. In this way, since electricity is supplied through the connection points between the liquid crystal panel 1 and the flexible wiring board 2 and between the flexible wiring board 2 and the common wiring board 3, the liquid crystal panel 1, the flexible wiring board 2 and the flexible wiring board 2 are based on the electric resistance. It is possible to simultaneously inspect the connection state between the common wiring board 3 and the common wiring board 3. Therefore, defective products can be prevented from flowing to the subsequent process, and as a result, product yield can be increased and manufacturing cost can be reduced.

Further, since the pads 21a and 22a are provided on the common wiring substrate 3, unlike the conventional case where they are provided on the liquid crystal panel, they can be easily formed of a relatively thick material such as copper. By thus forming the pads 21a and 22a with a thick material, durability against repeated inspection can be improved.

Further, since the pads 21a and 22a are provided on the common wiring board 3, the space for the first electrode terminals 7 of the panel 1 can be enlarged as compared with the case where they are provided on the liquid crystal panel 1. You can

FIG. 2 shows a modification of the liquid crystal display device.

This example is different in that the connection state is inspected through a current-carrying path extending over adjacent flexible wiring boards 2 and 2 '.

At the peripheral portion of the glass substrate 31 of the liquid crystal panel 1, a side 31 is formed in the gap between the rows of the first electrode terminals 7 in the longitudinal direction.
A pair of strip-shaped first inspection terminals 8 ', 9 perpendicular to a is provided. The first test terminals 8'and 9 are connected at their ends opposite to the side 31a by a first wiring 13 'extending parallel to the side 31a.

In the gap between the rows of the second electrode terminals 20 of the common wiring board 3, a pair of strip-shaped second inspection terminals 21 ', 22 whose longitudinal direction is perpendicular to an imaginary line (shown by a dotted line) is formed. It is provided. Further, on the back surface 3b of the common wiring board 3, a pair of pads 21a 'and 22a is provided corresponding to the inspection terminals 21 and 22. The pads 21a ', 22a and the second electrode terminals 21', 22 are individually connected by a pair of second wirings 23 ', 24.

The flexible wiring board 2 has the same structure as that shown in FIG. However, the inside wirings of the second wirings 11 and 12 shown in FIG. 1B are different in that they are routed in a U-shape in this example (represented by 12 ').

In the mounted state, the inspection terminal 8'of the panel 1 and the relay terminal of the flexible wiring board 2'via an anisotropic conductive film or the like as the panel 1 and the flexible wiring board 2 ', 2 are connected. 16, the inspection terminal 9 of the panel 1 and the relay terminal 16 of the flexible wiring board 2 are connected to each other.
Similarly, the flexible wiring boards 2 ', 2 and the common wiring board 3
Along with the connection with, the relay terminal 19 of the flexible wiring board 2'and the inspection terminal 21 'of the common wiring board 3 are connected, and the relay terminal 19 of the flexible wiring board 2 and the inspection terminal 22 of the common wiring board 3 are connected. It When inspecting the connection state, the pair of pads 21a 'and 22a of the common wiring board 3 are
Contact the probe with. Then, for example, the pad 21
a'to wiring 23 ', inspection terminal 21', relay terminal 19 of flexible wiring board 2 ', wiring 12', relay terminal 1
6, inspection terminal 8'of panel 1, wiring 13 ', inspection terminal 9, relay terminal 16 of flexible wiring board 2, wiring 1
2 ', the relay terminal 19, the inspection terminal 2 of the common wiring board 3
2. The wiring 24 is sequentially passed through to electrically supply the pad 22a.
Thereby, the electrical resistance is measured. In this way, since electricity is supplied through the connection points between the liquid crystal panel 1 and the flexible wiring boards 2 and 2'and between the flexible wiring boards 2 and 2'and the common wiring board 3, the liquid crystal panel 1 and the flexible wiring board are based on the electric resistance. 2, 2 ', flexible wiring board 2, 2'
It is possible to simultaneously inspect the connection state between the common wiring board 3 and the common wiring board 3.

Further, similarly to the previous example, the pads 21a ', 2
Since 2a is provided on the common wiring board 3, the pad 21
By forming a and 22a with a thick material, durability against repeated inspection can be enhanced. Further, the space for the first electrode terminal 7 of the panel 1 can be expanded.

[0025]

As is apparent from the above, the present invention provides a display panel having a plurality of first electrode terminals arranged in a peripheral portion of one surface along a side so as to ride on a virtual line,
A substrate having a second electrode terminal arranged on one surface so as to ride on an imaginary line, and arranged on one side and the other side of the one surface corresponding to the first and second electrode terminals, respectively. And a wiring board having an input terminal, the first electrode terminal of the display panel and the output terminal of the wiring board, the second electrode terminal of the substrate and the input terminal of the wiring board, respectively. In a display device which is electrically connected and transmits a signal supplied from the second electrode terminal of the substrate to the first electrode terminal of the display panel via the input terminal and the output terminal of the wiring board, the display panel is A pair of strip-shaped first inspection terminals provided so as to ride on the imaginary line of the peripheral portion and having a longitudinal direction perpendicular to the side of the peripheral portion, and extending in parallel to the side, Connecting the inspection terminals of each other
And a pair of second inspection terminals in a strip shape whose longitudinal direction is perpendicular to the imaginary line and a pair of pads. A pair of second wirings for individually connecting the pad and the second electrode terminal, the wiring board is provided on the output terminal side of the one surface, and the first inspection of the display panel is performed. A pair of first relay terminals corresponding to the first terminals, a pair of second relay terminals provided on the one side of the input terminal side and corresponding to the second inspection terminals of the substrate, and the first relay terminal. A pair of third terminals for individually connecting the relay terminal and the second relay terminal
Since it has wiring, when inspecting the connection state, the connection point between the substrate and the wiring board, the connection point between the wiring board and the display panel, the connection point between the display panel and the wiring board The electric current can be passed through the connection points between the wiring board and the substrate in order. Therefore, the connection point between the display panel and the wiring board and the connection point between the wiring board and the substrate can be inspected at the same time.

Further, since the pad is provided on the substrate, it is possible to enhance the durability against repeated inspection by forming the pad with a thick material. Moreover, the space for the first electrode terminal of the display panel can be enlarged.

[Brief description of drawings]

FIG. 1 is a diagram showing a main part of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a modified example of the liquid crystal display device.

FIG. 3 is a diagram showing a peripheral portion of a conventional liquid crystal display device as viewed perpendicularly to a panel surface.

FIG. 4 is a diagram schematically showing a cross section of the conventional liquid crystal display device.

FIG. 5 is a diagram showing an anisotropic conductive film.

FIG. 6 is a diagram showing an inspection electrode of the conventional liquid crystal display device.

[Explanation of symbols]

1 liquid crystal panel, 2,2 'flexible wiring board, 3 common wiring board,
4 driving IC, 7 first electrode terminal,
8,8 ', 9 1st inspection terminal, 10 output terminals, 11,12,12' 3rd
Wiring, 13, 13 'first wiring, 1
5,16 1st relay terminal, 17 input terminals,
18,19 Second relay terminal, 20 Second electrode terminal, 21,21 ', 22 Second inspection terminal,
21a, 21a'22a pads, 23, 23 ', 24 second
Wiring

Claims (1)

[Claims] 1. A display panel having a plurality of first electrode terminals arranged on one side so as to ride on a virtual line along a side, and a plurality of display panels arranged on one side so as to ride on a virtual line. A board having a second electrode terminal provided, and a wiring board having an output terminal and an input terminal respectively provided on one side and the other side of the one surface corresponding to the first and second electrode terminals, respectively. A first electrode terminal of the display panel and an output terminal of the wiring board, and a second electrode terminal of the substrate and an input terminal of the wiring board are electrically connected to each other, and In the display device for transmitting the signal supplied from the electrode terminal of the above to the first electrode terminal of the display panel through the input terminal and the output terminal of the wiring board, the display panel is mounted on the virtual line of the peripheral portion. And the longitudinal direction is perpendicular to the peripheral edge side. A pair of strip-shaped first inspection terminals and a first wiring extending in parallel with the side and connecting the first inspection terminals to each other, wherein the substrate is on the imaginary line on the one surface. And a pair of second test terminals in a strip shape whose longitudinal direction is perpendicular to the imaginary line, a pair of pads, and the pad and the second electrode terminal are individually connected. A pair of second wirings, the wiring board is provided on the output terminal side of the one surface,
A pair of first relay terminals corresponding to the first inspection terminals of the display panel, and a pair of second relay terminals provided on the one side of the input terminal side and corresponding to the second inspection terminals of the substrate.
And a pair of third wirings for individually connecting the first relay terminal and the second relay terminal.