JP4234023B2 - Display device and manufacturing method of display device - Google Patents

Description

  The present invention relates to a display device and a display device manufacturing method capable of preventing electrostatic breakdown in a manufacturing process of an insulating substrate on which a wiring group is formed.

  In the conventional display device, for discharging electrostatic charges before the formation of the short ring, a protrusion is formed in each wiring portion of the scanning line and the auxiliary capacitance line, and the position of the protrusion is arranged like a signal line in another layer. By selecting the position where the conductor pattern is not formed, the conductor pattern of the other layer such as the signal line and the scanning line or the auxiliary capacitance line are not short-circuited through the damage of the insulating film caused by the discharge. The destruction can be prevented (see, for example, Patent Document 1).

JP-A-8-234227 (FIG. 1)

  However, in the conventional display device described above, when static electricity is generated during the manufacturing process, electrostatic discharge is prevented by discharging at the protruding portion between the scanning line and the auxiliary capacitance line. The protrusion between the scanning line that discharges static electricity that reaches the volt and the auxiliary capacitance line may be short-circuited. When a short circuit occurs, the scanning line and the auxiliary capacitance line are short-circuited as a result, resulting in poor display. There was a problem of becoming.

  The present invention has been made in view of such problems, and it is possible to prevent electrostatic breakdown during a manufacturing process and to prevent a short circuit between a scanning line and an auxiliary capacitance line. An object is to provide a manufacturing method.

The display device of the present invention includes a pixel that forms a display region formed over an insulating substrate, a first signal line connected to the pixel, and a conductive film in the same layer as the first signal line . and are formed in parallel with said first signal line, the first signal line and the different signal second signal line for supplying a, in the display area outside the region, the first signal line and the second And an independent pattern having a dischargeable interval with respect to each of the first signal line and the second signal line. To do.

  According to the present invention, it is possible to prevent electrostatic breakdown during the manufacturing process of the display device and to prevent a short circuit between the scanning line and the auxiliary capacitance line.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows an equivalent circuit diagram of a display device according to Embodiment 1 of the present invention, and FIG. 2 shows an enlarged view of a main part in FIG.

  In FIG. 1, pixels for forming a display region 2 are provided on an insulating substrate 1, and each pixel includes a thin film transistor 3. The thin film transistor 3 has a gate connected to the scanning line 4, a source connected to the video signal line 5, and a drain connected to the auxiliary capacitance line 7 via the auxiliary capacitance 6. Although not shown, a pixel electrode made of a transparent electrode or the like is also connected to the drain. Since the same voltage is generally applied to the storage capacitor line 7 as a whole display device, the storage capacitor line 7 is connected to the common storage capacitor line 8 outside the display area 2 as shown in FIG. Each scanning line 4 and each video signal line 5 are led out from the display area 2 by a drawing scanning line 9 and a drawing video signal line 10, respectively, and the scanning line side external connection terminal 11 formed near the edge of the insulating substrate and the video. Each is connected to the signal line side external connection terminal 12. The common auxiliary capacitance line 8 is also connected to the auxiliary capacitance external terminal 13 formed in parallel with the scanning line side external connection terminal and the video signal line side external connection terminal. The external connection terminals 11, 12, 13 are connected to a drive circuit or the like mounted on a film substrate by a conductive material such as ACF (Anisotropic Conductive Film).

  FIG. 2 shows an enlarged view of the main part in FIG. 1, and specifically shows a patterning diagram for two scanning lines and two auxiliary capacitance lines outside the display region 2, and the display in FIG. The description of the thin film transistor in the region is omitted. Further, as shown in FIG. 1, the auxiliary capacitance line 7 in the figure is connected to the common auxiliary capacitance line 8 in a further outer region (not shown), and the scanning line 4 is shown in FIG. In FIG. 2, the structure is drawn to the left side and connected to the scanning line side external connection terminal 11. As shown in FIG. 2, in the present invention, in the region outside the display region on the insulating substrate, the scanning line and the auxiliary capacitance line formed by the same manufacturing process, that is, formed by the conductive film of the same layer. An independent pattern 14 formed of a conductive film of the same layer as the scanning line and the auxiliary capacitance line is provided therebetween, and the independent pattern 14 can discharge the distance between the scanning line 4 and the auxiliary capacitance line 7 respectively. It is formed with a small interval X. The dischargeable interval X represents a distance that can be discharged when static electricity reaching, for example, several thousand volts occurs during the manufacturing process of patterning each wiring on the insulating substrate, and preferably about 3 to 10 μm. It is. If the dischargeable interval X is 3 to 10 μm, the discharge can be surely performed, and after the discharge, the scanning line and the auxiliary capacitance line are short-circuited, and the scanning line is caused by the generation of foreign matters during the manufacturing process. Short-circuiting with the auxiliary capacitance line can also be suppressed.

  With the above-described configuration, during the manufacturing process of patterning each wiring and the like on the insulating substrate, for example, when static electricity reaching several thousand volts occurs, between each independent pattern and the scanning line or auxiliary capacitance line It is possible to suppress dielectric breakdown with other layers (video signal lines and the like) by discharging with. In the present embodiment, the independent pattern is formed with a dischargeable interval with respect to each of the scanning line and the auxiliary capacitance line. Are short-circuited between the scanning line and the auxiliary capacitance line, and the manufacturing yield is not lowered.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 3 shows an enlarged view of the main part of FIG. 1 in Embodiment 2 of the present invention.

  3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and differences will be described. In FIG. 3, in addition to the independent pattern 14 of FIG. 2, in the auxiliary capacitance line 7, a protrusion 15 having a dischargeable interval Y is formed between adjacent auxiliary capacitance lines. The dischargeable interval Y is preferably about 3 to 10 μm as in the first embodiment. Similarly to the case of FIG. 2 described above, the auxiliary capacitance line 7 in FIG. 3 is connected to the common auxiliary capacitance line 8 in a further outer region (not shown) as shown in FIG. The scanning line 4 is drawn to the left in FIG. 3 and connected to the scanning line side external connection terminal 11.

  With the above-described configuration, in addition to the effects of the first embodiment, since the same voltage is generally applied to the auxiliary capacitance line as the entire display device as described above, the same voltage is applied to the adjacent auxiliary capacitance lines. Is applied, and there is no inconvenience even if a short circuit occurs after the discharge, and it is possible to increase the portion having a dischargeable interval, and it is possible to more reliably prevent electrostatic breakdown. Although FIG. 3 shows the configuration in which the protruding portion is formed between the auxiliary capacitance line and the adjacent auxiliary capacitance line, the same configuration may be applied to the scanning line. However, if it is applied to the scanning line and is short-circuited with an adjacent scanning line after discharging, it will cause a display defect, so care must be taken when setting the dischargeable interval. The dischargeable interval between the scan line and the adjacent scan line is preferably about 5 to 10 μm in order to suppress a short circuit after discharge. For example, the scan line is cut off before the display device is completed, and discharge is possible between the scan line and a short ring formed of a conductive film in the same layer as the scan line at the periphery of the insulating substrate. By forming a portion having an interval (about 3 to 10 μm), it is possible to achieve the same effect as in the case of the auxiliary capacitance line. In this case, even if the short ring and the portion of the scanning line formed with a dischargeable interval are short-circuited after the discharge, the portion is cut off before the display device is completed as described above. , No problem arises. A configuration in which a dischargeable interval is provided between the short ring and the scanning line may be used in combination with the configuration of the first embodiment.

  As described above, in the first and second embodiments, the display device having the thin film transistor has been described. However, the present invention is not limited to this, and at least two kinds of signal lines formed in parallel with the same layer of conductive film are used. It is applicable to a display device having Further, in the above-described embodiment, a case has been described in which the scanning lines and the video signal lines are drawn out to different one sides in the display area, and the respective external connection terminals are formed on the different sides. The present invention may be applied to a display device in which external connection terminals for both scanning lines and video signal lines are formed on any one side. The present invention is suitable for application to any display device using a liquid crystal or an electroluminescence (EL) element having at least two kinds of signal lines formed in parallel by the same conductive film.

FIG. 3 is an equivalent circuit diagram of the display device in the first embodiment of the present invention. It is an enlarged view of the principal part in FIG. It is an enlarged view of the principal part of FIG. 1 in Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insulating substrate, 2 Display area, 3 Thin-film transistor, 4 Scan line, 5 Video signal line, 6 Auxiliary capacity, 7 Auxiliary capacity line, 8 Common auxiliary capacity line, 9 Lead-out scanning line,
10 lead-out video signal line, 11 scanning line side external connection terminal,
12 video signal line side external connection terminal, 13 auxiliary capacity external connection terminal, 14 independent pattern, 15 protrusion

Claims (5)

A pixel forming a display region formed on an insulating substrate;
A first signal line connected to the pixel;
A second signal line that is formed of a conductive film in the same layer as the first signal line and is formed in parallel with the first signal line, and supplies a signal different from the first signal line ;
In the region outside the display region, the first signal line and the second signal line are formed of a conductive film in the same layer, and each of the first signal line and the second signal line , An independent pattern with dischargeable spacing;
A display device comprising: The display device according to claim 1, wherein a dischargeable distance between the independent pattern and each of the first signal line and the second signal line is 3 to 10 μm. The second signal line or the first signal line is adjacent to the first signal line or between the second signal line and the second signal line adjacent to the second signal line in a region outside the display region. The display device according to claim 1, further comprising a protrusion having a dischargeable gap between the first signal line and the first signal line . A method of manufacturing a display device including pixels that form a display region formed on an insulating substrate,
A first signal line connected to the pixel, and forming a second signal line said supplying the first different signal to the signal line in parallel with the first signal line,
Forming an independent pattern having a dischargeable interval for each of the first signal line and the second signal line in a region outside the display region;
Are the same manufacturing process, The manufacturing method of the display apparatus characterized by the above-mentioned. 5. The method of manufacturing a display device according to claim 4, wherein a dischargeable interval between the independent pattern and each of the first signal line and the second signal line is 3 to 10 [mu] m.

Images