JP4739868B2 - Display panel - Google Patents

Description

  The present invention relates to a display panel having an arrester structure on electrode terminals formed around a transparent substrate constituting a non-display area of the display panel.

  In the display panel, electrode terminals drawn from the transparent electrodes formed in the display area are formed in a predetermined pattern on the transparent substrate constituting the non-display area, and the tip portions of the electrode terminals are respectively disposed on the transparent substrate. A predetermined image is displayed by connecting to a connection electrode terminal member (not shown) such as a semiconductor chip such as a driving LSI or a flexible electrode terminal substrate and selectively applying a voltage to the transparent electrode. It is configured.

  For example, FIG. 3 is a cross-sectional view showing a main configuration of a liquid crystal display panel 1 using a COG (Chip On Glass) mounting method in which a semiconductor chip such as a driving LSI is mounted on an electrode terminal portion in a non-display area.

  The liquid crystal display panel 1 shown in this figure has a pair of transparent substrates 2 arranged substantially in parallel and facing each other, and the viewer side (of the pair of transparent substrates 2 ( The transparent substrate 2 positioned on the upper side in the drawing is a front substrate 2F, and the transparent substrate 2 positioned on the counter-observer side (lower in the drawing) is a rear substrate 2R.

  A common electrode as a transparent electrode made of indium tin oxide (hereinafter referred to as ITO) or the like is formed on the surface of the transparent substrate 2R facing the other transparent substrate 2F. A segment electrode as a transparent electrode made of ITO or the like is formed on the surface facing the transparent substrate 2R. An alignment film (not shown) is provided on the surface of the transparent substrate 2 on which the common electrode and the segment electrode are formed, in order to arrange liquid crystal molecules in a certain form between the electrodes facing each other. Are laminated. A frame-shaped sealing material 4 having a substantially square frame shape is provided around the pair of transparent substrates 2 so as to adhere and integrate the transparent substrates 2R and 2F. In a plane surrounded by the frame-shaped sealing material 4, liquid crystal (not shown) is sealed together with a spacer (not shown) for adjusting the gap size between the transparent substrates 2R and 2F, and the pair of transparent substrates A liquid crystal layer 5 is formed between the two opposing surfaces. A portion corresponding to the liquid crystal layer 5 constitutes a display area of the liquid crystal display panel 1.

  The pair of transparent substrates 2 is made of a transparent resin such as transparent glass or polycarbonate, and is formed in a substantially rectangular flat plate shape. One end edge portion of the rear substrate 2R is formed so as to protrude from the end edge of the front substrate 2F in the non-display area, and the electrode terminal portion 6 is formed in this portion.

  FIG. 4 is a plan view showing a main part of the electrode terminal portion 6 of the liquid crystal display panel 1 shown in FIG.

  As shown in FIGS. 3 and 4, the electrode terminal portion 6 is formed with a common electrode disposed on the one transparent substrate 2R and a segment electrode disposed on the other transparent substrate 2F. These are the common electrode terminal 11 and the segment electrode terminal 12, respectively.

  A common electrode terminal 11 extending from the common electrode to the electrode terminal portion 6 is formed around the electrode terminal portion 6, and is connected to the semiconductor chip via the bumps B at the mounting position of the semiconductor chip 7. ing. Similarly, each segment electrode terminal 12 routed from each segment electrode to the electrode terminal portion 6 via a transfer portion (not shown) disposed on the frame-shaped sealing material 4 is also bumped. It is connected to the semiconductor chip 7 via B.

  In the liquid crystal display panel 1 configured as described above, a connection wiring member (not shown) such as a flexible wiring board is connected to the signal terminal 10 for external connection of the rear substrate 2R, and the connection wiring A predetermined image is displayed by applying a voltage to the common electrode and the segment electrode formed on each of the transparent substrates 2R and 2F via the member.

JP 2004-184545 A

  By the way, among the electrode terminals formed in the electrode terminal portion 6 in the non-display area of the liquid crystal display panel 1 as described above, there is a space between the bumps B connected to the semiconductor chip 7 mounted on the electrode terminal portion 6. There are electrode terminals that are routed through a narrow gap. In such a case, depending on the liquid crystal display panel 1, the width dimension of each electrode terminal does not become substantially the same in the entire length of the routing, and it becomes a routing shape in which the width dimension is abruptly narrowed in the middle portion. There is.

  For example, the common electrode terminal 11 shown in FIG. 4 has a narrow width portion 18 connected to the connection base end portion 16 on the electrode terminal portion 6, and the narrow width portion 18 includes the electrode terminal portion. A narrow gap is formed between the bumps B connected to the semiconductor chip 7 mounted on the semiconductor chip 7.

  In this conventional example, the width dimension of the narrow width portion 18 and the width dimension of the connection base end portion 16 are formed to be about 1:10, and thus the width dimension changes. In the common electrode terminal 11 having the shape, the narrow width portion 18 becomes an overcurrent state due to the electric charge charged in the transparent electrode 3 drawn around the display area, and the resistance load increases, and the narrow width portion 18 Burning may occur and disconnection may occur. The problem of this disconnection is that, particularly, the charge flows from the region side with a large arrangement area (display region side in the conventional example) toward the region side with a small arrangement area (non-display region side in the conventional example). In many cases, this occurs in the portion immediately before the narrow width portion 18 on the region side where the arrangement area is large.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a display panel having a configuration capable of preventing the electrode terminal from being burnt due to overcurrent and avoiding disconnection of the electrode terminal. .

  In order to achieve the above-described object, the display panel of the present invention has a narrow portion disposed in the middle portion of the electrode terminal routed on the substrate constituting the non-display area, and the direction in which the narrow portion is routed A connection base end portion is disposed on the electrode terminal side having a large area among the electrode terminals connected to both sides, and the ratio of the width dimension of the narrow width portion to the width dimension of the connection base end portion is 1: 5 or more. The connection base end portion is provided with a pointed portion as a discharge portion, and on the substrate, the pointed portion is separated from the discharge gap for discharge. The dummy electrode is provided.

  According to the display panel of the present invention, the pointed portion and the dummy electrode act as an arrester so that the discharge of excess charge flowing in the narrow portion of the electrode terminal occurs between the pointed portion and the dummy electrode. By inducing and eliminating the overcurrent of the electrode terminal to reduce the resistance load, disconnection of the electrode terminal can be avoided.

  In the second aspect of the present invention, the pointed portion is provided at an end portion on at least one side of an end side of the connection base end portion connecting the narrow width portion.

  According to the second aspect of the present invention, the electrode terminal is routed by forming the pointed portion at at least one end portion spaced from the connection portion of the narrow width portion at the connection base end portion. Since the discharge can be generated at a portion spaced apart from the narrow portion on the electrode terminal side disposed in a wide area among the electrode terminals disposed in both directions of the narrow portion in the direction, the narrow portion It is possible to reliably eliminate the overcurrent while avoiding the influence of the discharge on the width portion.

  In the third aspect of the present invention, a constriction portion in which the width of the electrode terminal gradually decreases from the connection base end portion side to the narrow width portion side is disposed between the connection base end portion and the narrow width portion. ing.

  According to the third aspect of the present invention, the resistance load is rapidly increased by gradually guiding the current flow to the narrow portion by the narrow portion formed between the narrow portion and the connection base end portion. It is possible to prevent the increase.

  As described above, according to the display panel of the present invention, it is possible to prevent scorching caused by overcurrent of the electrode terminal formed by changing the width dimension to a narrow width within a short distance. The disconnection of the electrode terminal can be avoided, and the electrical connection stability of the display panel can be ensured.

  FIG. 1 is a plan view showing a pattern of a common electrode terminal 11 as an electrode terminal formed on the electrode terminal portion 6 of the display panel 1 of the present embodiment corresponding to FIG. It is. In addition, about the liquid crystal display panel of this embodiment, about the component similar to the past, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The electrode terminal portion 6 of the liquid crystal display panel 1 of the present embodiment is formed at one end edge portion of the rear substrate 2R that is formed so as to protrude from the end edge of the front substrate 2F.

  A rectangular semiconductor chip 7 that is COG-mounted on the liquid crystal display panel 1 is connected to the electrode terminal portion 6 by forming a transparent conductive film made of ITO or the like in a predetermined pattern by photolithography or the like. A common electrode terminal 11 and a segment electrode terminal 12 having a predetermined routing pattern drawn from the transparent electrode 3 in the display area of the display panel 1 are formed.

  Further, in the liquid crystal display panel 1, a flexible wiring board (not shown) as a connection wiring member is connected to the signal terminal 10 for external connection formed on the rear substrate 2R, and the flexible wiring board is interposed through the flexible wiring board. The display panel 1 is configured to be electrically connected to an external drive circuit (not shown).

  In the liquid crystal display panel 1 of the present embodiment, the common electrode terminal 11 formed around the transparent substrate 2R of the electrode terminal portion 6 constituting the non-display area has a narrow width portion 18 and a connection base end connected to the narrow width portion 18. A portion 16 is formed. A portion where the width dimension ratio between the narrow width portion 18 and the connection base end portion 16 is set to 1: 5 or more is referred to as the arrester structure portion 15.

  In the present embodiment, the arrester structure portion 15 includes a common electrode terminal disposed in a wide area among the common electrode terminals 11 connected to both sides of the narrow width portion 18 in the direction in which the common electrode terminal 11 is routed. 11, that is, the width of the connection base end 16 located on the display area side and the center of the end side of the connection base end 16 gradually decreases from the connection base end toward the narrow width 18. A narrow width portion 18 is connected via a narrowing portion 17 that is connected, and the width dimension of the narrow width portion 18 (indicated by A in FIG. 1) and the width dimension of the connection base end portion 16 (in FIG. 1, B The ratio is set to 1: 5 or more (1:10 in the present embodiment).

  The arrester structure portion 15 is formed with pointed portions 19 as discharge portions at both end portions of the end of the connection base end portion 16 where the narrowed portion 17 is not connected, and the electrode terminal portion. 16 on the transparent substrate 2R, with an appropriate discharge gap G between the pointed portion 19 and the dummy electrode 20 for discharge, the tip portion facing the pointed portion 19 is pointed, It is made of ITO. The pointed portion 19 only needs to be formed at an end portion on at least one side of the connection base end portion 16 connecting the narrow width portion 18. The discharge gap G is more easily discharged to the dummy electrode 20 when formed with a size smaller than the gap between the connection base end portion 16 and the adjacent electrode terminal. In terms of specific dimensions, the discharge gap G is preferably 5 to 10 μm.

  Further, the shape of the tip portion of the pointed portion 19 or the dummy electrode 20 facing the pointed portion is not limited to the shape shown in FIG. 1 and is formed as a pointed protruding portion that is likely to generate discharge. It only has to be done. If it says dare, it is preferable that the said pointed part 19 is formed in the acute angle.

  According to the liquid crystal display panel 1 of the present embodiment having the common electrode terminal 11 having such a configuration, the pointed portion 19 and the dummy electrode 20 formed in the arrester structure portion 15 act as an arrester, and the common electrode terminal 11 to induce discharge of excess charges flowing in the arrester structure portion 15 between the pointed portion 19 and the dummy electrode 20, thereby eliminating the overcurrent of the common electrode terminal 11 and reducing the resistance load. The disconnection of the common electrode terminal 11 can be avoided.

  That is, when the common electrode terminal 11 must be formed by drawing a narrow gap between the bumps B connected to the semiconductor chip 7 mounted on the electrode terminal portion 6 as in the present embodiment, By forming the gap B between the bumps B with the narrow portion 18 of the arrester structure portion 15 configured as described above, it is possible to effectively prevent the narrow portion 18 from being disconnected due to overcurrent. An electrically stable liquid crystal display panel 1 can be provided.

  Further, in the liquid crystal display panel 1 of the present embodiment, the arrester structure portion 15 has a common electrode terminal 11 having a width dimension between the connection base end portion 16 and the narrow width portion 18 in the connection base end portion 16. Since the constricted portion 17 that gradually decreases from the side toward the narrow portion 18 is formed, the current is gradually guided to the narrow portion 18 by the constricted portion 17 so that the resistance load increases rapidly. It becomes possible to prevent.

  In particular, in the liquid crystal display panel 1 formed so that the ratio of the width dimension between the narrow width portion 18 and the connection base end portion 16 is 1: 5 or more (1:10 in this embodiment), In the case of the structure, the possibility of occurrence of disconnection due to overcurrent is extremely high. However, as in the present embodiment, the common electrode terminal 11 has an arrester structure, and a narrow width portion via the narrowed portion 17. By forming 18, overcurrent can be effectively prevented.

  Furthermore, the liquid crystal display panel 1 according to the present embodiment is configured so that the pointed portion 19 is formed at an end portion on at least one side of the connection base end portion 16 that is separated from the connection portion of the narrow width portion 18. Since the discharge can be generated at a site separated from the width portion 18, it is possible to reliably eliminate the overcurrent while avoiding the influence of the discharge on the narrow width portion 18. In addition, if the said pointed part 19 is formed in the edge part of the at least one side of the said connection base end part 16 which connects the said narrow width part 18, the effect which this invention expects can be acquired. it can.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed. For example, although a liquid crystal display panel has been described as an example of the display panel, an organic EL display panel or a plasma display panel may be used. The electrode terminal having the arrester structure is not limited to the common electrode.

Explanatory drawing which shows the shape of the common electrode as an example of the electrode terminal formed in the electrode terminal part in embodiment of the liquid crystal display panel of this invention Fig. 1 is an enlarged view of the main part of the arrester structure of the common electrode in the liquid crystal display panel of Fig. 1. Sectional drawing which shows the principal part structure of the conventional liquid crystal display panel Explanatory drawing which shows the shape of the common electrode as an example of the electrode terminal formed in the electrode terminal part in the conventional liquid crystal display panel

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Transparent substrate 2F Front substrate 2R Rear substrate 3 Transparent electrode 4 Frame-shaped sealing material 5 Liquid crystal layer 6 Electrode terminal part 7 Semiconductor chip 10 External connection signal terminal 11 Common electrode terminal 12 Segment electrode terminal 15 Arrester structure part 16 Connection Base end portion 17 Narrow portion 18 Narrow portion 19 Pointed portion 20 Dummy electrode G Discharge gap B Bump

Claims (3)

An electrode having a wide area among the electrode terminals connected to both sides in the routing direction of the narrow width portion, in which a narrow width portion is disposed in the middle portion of the electrode terminal routed on the substrate constituting the non-display area A connection base end portion is disposed on a terminal side, and a ratio of a width dimension of the narrow width portion and a width dimension of the connection base end portion is 1: 5 or more,
The connecting base end portion is provided with a pointed portion as a discharge portion, and a dummy electrode for discharging is provided on the substrate with a discharge gap spaced from the pointed portion. A display panel characterized by   The display panel according to claim 1, wherein the pointed portion is provided at an end portion on at least one side of an end side of the connection base end portion connected to the narrow width portion. The narrowed part where the width | variety of an electrode terminal reduces gradually from the said connection base end part side to the narrow part part side is arrange | positioned between the said connection base end part and the narrow part. Display panel.