JP2001168478A - Wiring board device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent short-circuiting of a wiring pattern or the like by a mark part, even if the mark part is set to a position that is different from a normal one by mistake and to provide a wiring board device with sufficient identification power, when the mark such as an alphanumeric and a mark for indicating the wiring number, direction, or the like is formed on a wiring substrate having a conductive wiring pattern by the same conductor as the wiring pattern. SOLUTION: A mark part 14, that is composed of a plurality of independent conductive pieces 15 and indicates a single mark by the gathering of the conductive pieces 15, is provided on a wiring substrate 13 with a wiring pattern 11 consisting of a plurality of conductive wiring 12 is configured, so that the length of the conductive pieces 15 becomes shorter than the pitch of the wiring pattern 11, thus preventing the short-circuiting of the wiring pattern 11, even if the mark part 11 exists between the wiring 12 of the wiring pattern 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring board having a large number of parallel wiring pattern portions formed thereon, such as a liquid crystal display device, and the like. Regarding a wiring board device in which a code such as an identification symbol or a sign indicating directionality is formed by a conductor, by configuring the code portion such that one code is configured by a set of a plurality of conductor pieces. The present invention relates to a wiring board device that does not hinder the function of a wiring pattern even if the position of a code is not formed at a predetermined position by mistake.

[0002]

2. Description of the Related Art At present, liquid crystal display devices take advantage of their features such as thinness, light weight and low power consumption, and personal OA devices such as personal word processors and personal computers;
It is widely used as a display for a television receiver or the like. Among them, an active matrix type liquid crystal display device in which a thin film transistor (TFT) is integrally provided as a switching element for each pixel can realize a good display image without crosstalk between adjacent pixels. It has become mainstream.

As shown in FIG. 3, this active matrix type liquid crystal display device comprises a plurality of TFs arranged in a matrix on an insulating wiring substrate 31 which is generally made of a glass material.
Transparent pixel electrode 33 connected to T32, and this TFT
A signal line (not shown) and a scanning line (not shown) for driving the drive circuit 32 are provided. The array substrate 35 includes
A transparent electrode 37 and an alignment film 3 are provided on a counter substrate 36, which is also made of a glass material and is opposed to the array substrate 35.
8 are sequentially formed, and in the case of a color display, three primary color RGB color filters 39 are provided.

[0004] The array substrate 35 and the opposing substrate 36 are opposed to each other with a predetermined gap therebetween, and are adhered to each other via a sealing material 40. A liquid crystal member 41 is injected into this gap from an injection port (not shown), and the injection port is sealed with a sealing material (not shown).
The thickness of 1 is defined by the spacer 42 interposed between the array substrate 35 and the counter substrate 36 to form the display unit 43.

At the end of the array substrate 35, a driving TAB-IC 44 for supplying signals such as predetermined gate signals and video signals to scanning lines and signal lines is arranged. The IC 44 is connected by the wiring pattern shown in FIG. A retardation plate or polarizing plates 45 and 46 are attached to outer surface sides of the array substrate 35 and the counter substrate 36, and a backlight 47 is disposed outside the polarizing plate 45 on the array substrate 35 side to transmit light. Type liquid crystal display device. If the polarizing plate 45 is replaced by a light reflecting film instead of the backlight 47, a reflection type liquid crystal display device can be constructed.

In the liquid crystal display device thus configured, the array substrate 35, that is, the wiring substrate 31,
44, a thin film forming process, a photolithography (PEP) process for forming a photoresist mask,
Further, it is manufactured by repeating an etching process for removing an unnecessary portion of the thin film. The wiring board 31 is provided with a code such as an alphanumeric character or a mark that functions as a predetermined electric circuit component such as a wiring pattern, a TFT 32, and a capacitor and has no relation to a factor that determines device characteristics. Is common.

For example, as shown in FIG. 4, in a liquid crystal display device, the wiring pitch of the display section 43 and the TAB-IC4
Since the wiring pitch between the display pad 43 and the connection pad 51 is different from the wiring pitch between the display pad 43 and the connection pad 51, the wiring pattern 52 such as a scanning line or a signal line becomes an oblique wiring 53. Wiring 53 on 43 side and connection pad 51
A code such as a numeral corresponding to each of the two wirings 53 is added to the vicinity of each of the wirings 53 as a code part 54 also formed of a conductive material.
The three types are identified. This code part 54 is
When the wiring pattern 52 is formed near the wiring pattern 52 such as a scanning line or a signal line at the same time as the wiring pattern 52 is formed, the wiring pattern 52 is formed on the wiring substrate 31 at the same time.

As an example, in the case of a liquid crystal display device having an XGA resolution, the first to 768th (or the 0th to 76th) lines are connected to the scanning lines 53 constituting the wiring pattern 52.
A code portion 54 consisting of a number (No. 7) is provided to identify each wiring 54. The code portion 54 is mainly used for visually identifying with a microscope or mechanically recognizing the number of the wiring pattern 52 by pattern recognition, and is mainly used for analyzing a defect that occurs during a manufacturing process. .

For example, it is used when the coordinates of a line defect in a screen due to a malfunction of the TFT 32 are known. Further, on the outer portion of the screen display area of the wiring substrate 31, there is provided a sign portion 54 including a mark for performing alignment between the mask and the wiring substrate 31 at the time of exposure, a mark for checking processing accuracy, and the like. The code portions 54 such as marks are useless codes for the completed liquid crystal display device, but can be said to be indispensable codes in the manufacturing process of the liquid crystal display device.

[0010]

At present, generally, a CAD system for layout design is widely adopted as a method for preparing these exposure masks. By using this CAD system, designs can be made easily, and codes such as alphanumeric characters and marks are also used as a common library, and designers can place these in the positions determined for each product. Designed to place codes.

However, while this CAD system can be designed easily, there are cases where these codes are set at positions different from the originally set positions due to scanning mistakes of the CAD system by the designer. If a mask is manufactured without noticing this mistake and the wiring pattern 52 and the code part 54 are formed on the wiring board 31, the code part 54 overlaps with the wiring pattern 52, for example, as shown in FIG. The sign 54 causes the wiring 53 to be short-circuited, causing an accident that the wiring board 31 such as the array board 35 becomes defective. It is difficult to repair the defective wiring board 31 itself.
The work must be restarted, and not only time is lost, but also the wiring board 31 must be disposed of, resulting in an increase in cost and a decrease in manufacturing yield.

According to the present invention, even if such an erroneous arrangement of the code portion occurs, the produced wiring board can be used as it is, which adversely affects the performance of a product using the wiring board. Instead, to provide a wiring board device that can be used continuously.

[0013]

According to the present invention, one code is constituted by an insulating wiring board on which a conductive wiring pattern is formed, and a set of a plurality of mutually independent conductor pieces provided on the wiring board. A wiring board device comprising:

Further, in the code part, when the conductive wiring pattern is composed of a plurality of wirings, a conductor piece constituting the code part is formed shorter than an interval between wirings of the wiring pattern. It is characterized by the following.

[0015]

Embodiments of the present invention will be described below. Since the configuration of the entire liquid crystal display device is not different from the conventional configuration, a detailed description thereof will be omitted, and only the part of the array substrate to which the present invention is applied, that is, the wiring substrate device will be described. Shall be.

FIG. 1 is an enlarged explanatory view showing a part of a wiring pattern of a wiring board device according to an embodiment of the present invention, wherein a TAB-IC connection pad (not shown) and a display unit (not shown) are provided. (Not shown), since the wiring pitch between the connection pad and the display section is different as described above, a plurality of conductive wirings 12 run diagonally in parallel on the surface of the wiring board 13. It is provided. At each end of the wiring 12, a code consisting of a number, for example, representing a wiring number and the like, which is located in the vicinity of the wiring 12, is formed of a conductor similarly to the wiring pattern 11. 14 are formed.

The code portion 14 represents one character by expressing the code of one character by combining a plurality of divided conductive pieces 15 which are independent from each other. Each conductor piece 1 constituting the code part 14
5 are isolated from each other and do not constitute a conductive state. In the example shown in FIG.
This shows a state where the wiring pattern 11 has been arranged so as to be superimposed on the wiring pattern 11.

This wiring board device has, for example, a diagonal 12.
When a liquid crystal display device having a resolution of 1 inch and a resolution of XGA is configured, the wiring pitch of the display unit provided on the wiring board 13 is 240 μm for the scanning lines and 80 μm for the signal lines. The wiring pitch of the connection pad is 100 μm on the scanning line side and 50 μm on the signal line side.
Therefore, the minimum interval between the wirings is 30 at the oblique wiring 12 portion.
Designed as μm. Therefore, if the maximum size of the plurality of conductor pieces 15 constituting the code part 14 is set to 30 μm or less, as shown in FIG.
Even if it is located between them, the conductor pieces 15
There is no short circuit between them. In the case of the present embodiment, the diagonal dimension of the longest conductor piece 15 (when the conductor piece 15 is square) is set to be 25 μm or less in view of the safety side.

With such a configuration, when designing using the CAD system, the normal position where the encoding unit 14 is erroneously set on the wiring pattern 11 as shown in FIG. Even when the mask is manufactured at different positions, since the maximum size of each conductor piece 15 constituting the code portion 14 is set to be equal to or smaller than the width of the wiring 12 and the pitch of the wiring 12, There is no danger of short-circuiting between the wirings 12 due to the presence of the body piece 15, and therefore, the wiring board device is not wasted.

The present invention is not limited to the above-described rubbing of an alignment film for aligning the orientation of liquid crystal molecules in an array substrate in a fixed direction as shown in FIG. The present invention can be applied to a code portion 14 such as an arrow mark indicating the direction of a wiring substrate 13 such as an array substrate or a counter substrate required in the process, and any of the code portions 14 uses a microscope. In the visual inspection, the conventional continuous and integrally formed code portion 5 was used.
It was confirmed that it could be recognized in the same manner as in No. 4.

According to the present invention, the plurality of conductor pieces 15 constituting the code portion 14 may have various shapes such as a square, a rectangle, a rhombus, or a circle without being limited to the shape of the embodiment. It is sufficient that the code section 14 is composed of two or more conductor pieces 15 and can be composed of an aggregate of a large number of dot-shaped conductor pieces 15. Depending on the type, it is of course possible to take various forms, and when forming a plurality of code portions 14,
It is also possible to use a combination of the code portions 14 of different forms, and furthermore, the conductor pieces 15 constituting the same code portion 14
It is also possible to configure one code part 14 with different shapes.

Although the present invention has been described with reference to the case where the present invention is applied to a liquid crystal display device, the present invention can be applied not only to other electric equipment but also to a printed wiring board other than a glass array board. Needless to say.
Various other applications and modifications are conceivable, but it is apparent that the present invention is not limited to these examples.

[0023]

According to the present invention, a code portion such as an alphanumeric character or a mark provided on a wiring board is constituted by a set of a plurality of conductor pieces, so that, for example, due to a design error, the code portion of the code portion may be changed. Even if the set position is shifted from the normal position or set at a different position, it is possible to prevent an accident such as short-circuiting between the wires due to the presence of the code portion, and again. It is possible to provide a wiring board device that can be used continuously without the necessity of creating a new mask, such that the wiring board device can be used as it is, and is also advantageous in terms of cost and improved in manufacturing yield. can do.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a wiring board device according to the present invention.

FIG. 2 is an explanatory view showing another example of the code section constituting the wiring board device according to the present invention.

FIG. 3 is a configuration diagram showing a conventional liquid crystal display device.

FIG. 4 is an explanatory view showing a conventional wiring board device.

FIG. 5 is an explanatory diagram showing a state of misplaced code portions in a conventional wiring board device.

[Explanation of symbols]

 11: Wiring pattern 12: Wiring 13: Wiring board 14: Code part 15: Conductor piece

Claims (2)

[Claims] 1. An insulative wiring board on which a conductive wiring pattern is formed, and a code section provided on the wiring board and having a code formed by a set of a plurality of conductor pieces independent of each other. A wiring board device. 2. The code portion, wherein when the conductive wiring pattern is composed of a plurality of wirings, a conductor piece forming the code portion is formed shorter than an interval between wirings of the wiring pattern. The wiring board device according to claim 1, wherein: