JPH11296102A - Plane display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily check a signal line while keeping an effective display area sufficient for an external dimension by providing a pad for signal line check adjacent to the effective display area on a first substrate, arranged in a second peripheral area facing a first peripheral area and electrically connected to the signal line. SOLUTION: This device is constituted by arranging a flexible wiring board 10 for electrically connecting signal output pad groups 25-2, 25-4, 25-6, 25-8 and 25-10 and signal input pad groups 25-3, 25-5, 25-7, 25-9 and 25-11 electrically connected to signal input pad groups 25-1 and 49 and adjacently arranged so as to supply correspondent video signals and control signals. Thus, even when respective land groups 23-1 to 23-6 for signal line output are respectively arranged at narrow pitches, since pad groups 33-1 to 33-6 for signal line check are arranged while keeping sufficient pitches on one terminal side 10b confronted with the land groups 23-1 to 23-6 for signal line output, a probe can be easily abutted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat display device, and more particularly to a structure of a flat display device in which a driving circuit element is mounted on a substrate.

[0002]

2. Description of the Related Art In recent years, a flat display device represented by a liquid crystal display device has been characterized by its thinness, light weight, and low power consumption.
It has been used in various fields. Recently, further miniaturization and higher definition have been desired.

Under such circumstances, a technique of directly mounting a driving circuit element, for example, an IC chip on one substrate constituting a flat display device, that is, COG (Chip On Glass).
s) Development of a flat panel display device using technology is underway.

By directly mounting the drive circuit elements on the board in this manner, the area of the external drive circuit board can be reduced, and even if the wiring pitch is narrow to achieve higher definition, the drive circuit elements can be mounted. Since it is mounted directly on the board, the electrical connection pitch with the drive circuit board is not so severe, and there is an advantage that connection failure is reduced.

[0005]

However, in the above-mentioned flat display device, the pads arranged on the substrate for mounting the drive circuit elements and obtaining the electrical connection have an extremely narrow pitch. In the process, it is difficult to accurately contact the probe on the pad.

Accordingly, the present invention has been made in view of the above problems, and has as its object to provide a flat display device capable of easily performing an inspection while maintaining a sufficient effective display area with respect to external dimensions.

[0007]

According to a first aspect of the present invention, there is provided a flat panel display device, wherein a plurality of signal lines and scanning lines are arranged in a matrix on a substrate, and a switch is provided near an intersection of the signal lines and the scanning lines. A first substrate provided with an effective display area including a pixel electrode disposed via an element, a second substrate disposed opposite to the first substrate via a light modulation layer, and the effective display of the first substrate A signal line drive circuit element disposed in a first peripheral region adjacent to the region and electrically connected to the signal line, wherein the flat display device is adjacent to the effective display region of the first substrate; The flat display device further includes a signal line inspection pad arranged in a second peripheral region opposite to the first peripheral region and electrically connected to the signal line. According to the flat display device, the inspection can be easily performed without greatly increasing the outer dimensions of the effective display area.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display 1 according to one embodiment of the present invention will be described below with reference to FIGS. The liquid crystal display device 1 includes a 7-inch diagonal effective display area 3 capable of light-transmitting color display. A liquid crystal layer as a layer is held and configured. As the liquid crystal layer, various types such as a twisted nematic liquid crystal, a guest host liquid crystal, a polymer dispersed liquid crystal, a ferroelectric or antiferroelectric liquid crystal can be used.

The array substrate 11 includes, for example, a plurality of scanning lines Y made of an aluminum alloy disposed on a glass substrate 10 as a transparent insulating substrate, and a plurality of signal lines made of an aluminum alloy substantially orthogonal to the scanning lines Y. The thin film transistor (TFT) 12 is located near the intersection of the scanning line Y and the scanning line Y with the signal line X.
And a pixel electrode 15 made of ITO, which is a kind of transparent conductive film, disposed through the pixel electrode. The pixel electrodes 15 arranged in a matrix form the effective display area 3.

[0010] In the effective display area 3, the signal line X is set to 0.
Wires are provided at a pitch of 107 mm, and are drawn out from the effective display area 3 to one end side 10a of the substrate. Since the signal lines X are mounted with the signal line driving IC chips 61-1 to 61-6 via the oblique wiring regions 21-1 to 21-6, the lands of each group are arranged at a pitch of 0.045 mm. It is electrically connected to the signal line output land groups 23-1 to 23-6. Further, near each of the signal line output land groups 23-1 to 23-6, each signal line driving IC chip 61-1 to 61-6 is mounted, and a signal input for inputting a video signal and a control signal is performed. Land group 24-1, 24-3, 24-5, 24-7, 24-9, 2
4-11 and signal output land groups 24-2, 24-4, 24-6, 24-8, 24-10 for outputting control signals. The signal line driving IC chips 61-1 to 61-6 including the corresponding connection electrodes on the lands are electrically and mechanically connected via, for example, an anisotropic conductive film (ACF). For this connection, a solder connection or the like may be used instead of the ACF. This signal line driving IC chip 61-1
61 to 61-6 are configured to sequentially sample and hold an input video signal based on a control signal and output a video signal voltage to a corresponding signal line X over each horizontal scanning period.

The signal input land groups 24-1 and 24-
In the vicinity of 3, 24-5, 24-7, 24-9, 24-11, each signal input land group 24-1, 24-3, 24-5, 24-7, 24-
Signal input pad group 2 electrically connected to 9, 24-11
5-1, 25-3, 25-5, 25-7, 25-9, 25-11 are arranged, and signal output land groups 24-2, 24-4, 24-6, 2
In the vicinity of 4-8 and 24-10, each signal output land group 24-2, 2
Signal output pad groups 25-2, 25-4, 25-6, 25-8, 2 electrically connected to 4-4, 24-6, 24-8, 24-10
5-10 are arranged.

The signal lines X are led out to the other end 10b opposite to the one end 10a of the substrate 10, and are arranged at a pitch of 0.08 mm through the oblique wiring regions 31-1 to 31-6. It is electrically connected to the signal line inspection pad groups 33-1 to 33-6.

The scanning line Y is led out to one end side 10c of the substrate 10 and is electrically connected to a scanning line inspection pad group 43 having a pitch of 0.06 mm via an oblique wiring area 41 and further to the outside thereof. Through the oblique wiring area 45 and the signal line X
Similarly to the side, it is electrically connected to a scanning line driving land group 47 having a pitch of 0.045 mm. In the vicinity of the scanning line output land group 47, a signal input land group 48 for mounting a scanning line driving IC chip 71 and inputting a control signal.
Is arranged. The scanning line driving IC chips 71 corresponding to these lands are electrically and mechanically connected via the ACF. In the vicinity of the signal input land group 48, a signal input pad group 49 that is electrically connected to the signal input land group 48 is arranged. This scanning line driving IC
The chip 71 is configured to sequentially output a scanning pulse to a corresponding scanning line Y over each horizontal scanning period based on an input control signal.

The signal input pads 25-1 and 49 are electrically connected to supply corresponding video signals and control signals, and the signal output pads 2 arranged adjacent to each other.
Electrical connection between 5-2, 25-4, 25-6, 25-8, 25-10 and signal input pad groups 25-3, 25-5, 25-7, 25-9, 25-11 Flexible wiring board 10 for connection
1 are arranged.

With the above-described configuration, the liquid crystal display device has a high definition, and each of the signal line output land groups 23-1 to 23-6.
Are arranged at a narrow pitch, the signal line inspection pad groups 33-1 to 33-6 are arranged in the signal line output land group 23-1.
Since the probe is arranged with a sufficient pitch on the one end side 10b opposite to .about.23-6, the probe can be easily contacted. The signal line inspection pad groups 33-1 to 3-3
Since 3-6 is arranged in the peripheral area on the one end side 10b side of the substrate 10, the external dimensions do not increase as compared with the conventional case.

In this embodiment, the signal line inspection pad group 3
3-1 to 33-6 pass through the oblique wiring regions 31-1 to 31-6 and go to 0.
The arrangement was made at a pitch of 08 mm, in order to facilitate the contact of the probe by dividing the signal line inspection pad groups 33-1 to 33-6 into predetermined groups. Can be directly led to the signal line inspection pad groups 33-1 to 33-6 in a state where the pitch is maintained. In this case, the pitch of each pad can be set wider than in this embodiment.

The scanning line inspection pad group 43 is arranged between the oblique wiring area 41 and the oblique wiring area 45 while maintaining a sufficient pitch that can be inspected. It is necessary to secure them, but the external dimensions do not increase significantly.

A further characteristic of this embodiment is that a substantially L-shaped short ring wiring 9 is provided on the outer periphery of the signal line inspection pads 33-1 to 33-6 and the outer periphery of the scanning line driving land group 47. Is to be arranged. Then, the scanning line Y and the short ring wiring 9, and the signal line X and the short ring wiring 9
Are electrically connected via the non-linear resistance elements 7 and 8, respectively.

The non-linear resistance elements 7 and 8 correspond to FIG.
As shown in (a) and (b), the thin film transistors whose gate and drain are short-circuited are connected in parallel to each other. More specifically, as shown in FIG. 3A, a short ring wiring 9 is arranged on the outer periphery of the signal line inspection pad 32-2, and between the signal line inspection pad 32-2 and the short ring wiring 9. Non-linear resistance elements 8 are arranged respectively. This non-linear resistance element 8 has a resistance sufficient to insulate between adjacent signal lines X at the time of inspection,
When static electricity or the like is locally applied to the signal line X, it has a function of conducting the signal line X and the short ring wiring 9.

As shown in FIG. 3B, a short ring wiring 9 is arranged on the outer periphery of the scanning line driving land group 47, and between the scanning line driving land group 47 and the short ring wiring 9. Non-linear resistance elements 7 are arranged. This non-linear resistance element 7 also has a resistance sufficient to insulate between adjacent scanning lines Y at the time of inspection, and when static electricity or the like is locally applied to the scanning lines Y, It has a function to make Y and the short ring wiring 9 conductive. After the inspection, the short ring wiring 9 is
For example, it is removed by laser light irradiation.

As described above, the short ring wiring 9
Since the inspection pad group is arranged on the side opposite to the object to be inspected, the inspection signal waveform is not undesirably deteriorated by the resistance components of the non-linear resistance elements 7 and 8.

Further, since the short ring wiring 9 is arranged in a region below the scanning line driving IC chip 71, there is no increase in external dimensions due to the short ring wiring 9. As described above, in the liquid crystal display device 1 of the present embodiment, the signal line inspection pad groups 33-1 to 33-6 are opposed to the signal line output land groups 23-1 to 23-6 of each signal line X. Therefore, the lands are arranged with a sufficient pitch without depending on the pitch of the land groups 23-1 to 23-6. The scanning line inspection pad group 43 is arranged at a sufficient pitch in the middle of the diagonal wiring from each scanning line Y to the scanning line output land group 47.

As a result, the contact of the probe with each inspection pad is facilitated, and an accurate inspection can be performed in a short time. As this inspection, for example, a short circuit inspection by detecting a current leak between adjacent wirings or a current leak between a signal line and a scanning line, sequentially writing a predetermined voltage to each pixel electrode, and after a lapse of a predetermined time, An operation test of the TFT or the like by reading is performed.

As a result, it is possible to prevent defective products from flowing into the subsequent process at an early stage, and to improve the overall yield. In addition, signal line inspection pad groups 33-1 to 33-
6 can be arranged in the remaining area of the related art, so that there is no increase in the outer dimensions of the effective display area. In addition, since the scanning line inspection pad group 43 is disposed in the middle of the diagonal wiring from each scanning line Y to the scanning line output land group 47, the external dimensions of the effective display area do not increase. This is because the scanning line Y pitch and the pitch of the scanning line output land group 47 are significantly different from those on the signal line side, so that the diagonal wiring area needs to be set sufficiently large.

Further, since the short ring wiring 9 is arranged in a region below the scanning line driving IC chip 71, there is no increase in external dimensions. In the above-described embodiments, the liquid crystal display device has been described as an example. However, the present invention is not limited to this embodiment, and can be suitably used for various flat panel display devices.

[0026]

As described above, according to the flat display device of the present invention, the inspection can be easily performed without a significant increase in the outer dimensions of the effective display area.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a liquid crystal display device according to one embodiment of the present invention.

FIG. 2 is a schematic front view of an array substrate according to one embodiment of the present invention.

FIG. 3 is an enlarged view of a main part of an array substrate according to one embodiment of the present invention. .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device 10 ... Substrate 21 ... Oblique wiring area 23 ... Land 31 ... Oblique wiring area 47 ... Land

Claims (8)

[Claims] 1. An effective display area including a plurality of signal lines and scanning lines arranged in a matrix on a substrate and including a pixel electrode arranged via a switch element near an intersection of the signal line and the scanning line. A first substrate, a second substrate opposed to the first substrate via a light modulation layer, a second substrate disposed in a first peripheral region of the first substrate adjacent to the effective display region, A flat panel display device comprising a signal line drive circuit element electrically connected to the first substrate, the flat panel display device being disposed in a second peripheral region adjacent to the effective display region of the first substrate and facing the first peripheral region; A flat display device comprising a signal line inspection pad electrically connected to a signal line. 2. The flat display device according to claim 1, wherein
A scanning line driving circuit element disposed in a third peripheral area adjacent to the effective display area of the first substrate and electrically connected to the scanning line; the effective display area and the scanning line driving circuit element And a scanning line inspection pad electrically connected to the scanning line. 3. The method according to claim 1, wherein the first peripheral region includes a land corresponding to the signal line driving circuit element, and includes a diagonal wiring region that makes the pitch of the land smaller than the pitch of the signal lines. The flat panel display according to claim 1. 4. The third peripheral region includes a land corresponding to the scanning line drive circuit element, and includes a diagonal wiring region for making the land pitch smaller than the scanning line pitch. The flat display device according to claim 2. 5. The flat display device according to claim 2, wherein an electrode wiring electrically connected to the scanning line is arranged below the scanning line driving circuit element. 6. The flat display device according to claim 5, wherein the electrode wiring and the scanning line are electrically connected via a non-linear resistance element. 7. The flat display device according to claim 1, wherein an electrode wiring electrically connected to the signal line is arranged on an outer periphery of the signal line inspection pad in the second peripheral region. . 8. The flat display device according to claim 7, wherein the electrode wiring and the scanning line are electrically connected via a non-linear resistance element.