JP3612898B2 - LCD module - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display module.
[0002]
[Prior art]
Conventional liquid crystal display modules include those shown in FIGS. 5 shows a plan view of the liquid crystal display module, FIG. 6 shows a plan view with the upper shield case 3 removed in FIG. 5, and FIG. 7 shows a cross-sectional view taken along line YY in FIG. . This liquid crystal display module includes a conductive shield case in which a side wall 2 of a metal lower shield case 1 is fitted into a side wall 4 of a metal upper shield case 3 and is coupled to each other by a hook portion (not shown). ing. Openings 5 and 6 are provided in corresponding portions of both shield cases 1 and 3. A liquid crystal display panel 11 is housed in both shield cases 1 and 3 by being bonded to the inner surface of the lower shield case 1 via a double-sided adhesive tape (not shown). The liquid crystal display panel 11 has a structure in which polarizing plates 14 and 15 are attached to the lower and upper surfaces of a pair of glass substrates 12 and 13 constituting a liquid crystal cell. In this case, a semiconductor chip 16 made of LSI or the like is mounted at each predetermined location on the right side of the lower glass substrate 12 and the upper surface of the lower side, and a flexible wiring substrate is provided at a predetermined location on the upper surface of the lower glass substrate 12. One end of 17 is connected.
[0003]
By the way, when manufacturing the liquid crystal display panel 11, in order to improve productivity, for example, a glass substrate serving as a base of the lower glass substrate 12 is prepared with a size corresponding to a plurality of lower glass substrates, In some cases, a plurality of batches are manufactured up to a predetermined step and then divided into individual pieces. Further, when the liquid crystal display panel 11 including a thin film transistor as a pixel switching element is manufactured, electrostatic breakdown occurs in the thin film transistor or the like due to, for example, static electricity generated when the alignment film is rubbed before being divided into individual pieces. Therefore, countermeasures against static electricity are taken to prevent this.
[0004]
FIG. 8 is an equivalent circuit plan view in a state in which the thin film transistor 24 and the like are formed on the glass substrate 21 having a size corresponding to a plurality of lower glass substrates. The glass substrate 21 having a size corresponding to a plurality of lower glass substrates is finally cut along a cut line 22 indicated by an alternate long and short dash line, thereby being divided into individual pieces. In this case, a region surrounded by the cut line 22 is a lower glass substrate forming region, and the periphery thereof is an excessive portion.
[0005]
In the lower glass substrate formation region surrounded by the cut line 22, a plurality of pixel electrodes 23 arranged in a matrix, a plurality of thin film transistors 24 respectively connected to these pixel electrodes 23, and the row direction are extended. A plurality of scanning lines 25 that supply scanning signals to the thin film transistors 24, a plurality of signal lines 26 that extend in the column direction and a data signals that supply data signals to the thin film transistors 24, and a row direction that extend from the pixel electrode 23 A plurality of storage capacitor lines 27 that form the storage capacitor portion Cs between them, and a plurality of input lines 28 that are connected to one end of the flexible wiring board 17 shown in FIG. 6 are provided. Short lines 29 are provided in a grid pattern in an excess portion around the cut line 22.
[0006]
The right end portion of the scanning line 25 is connected to the short line 29 after passing through the semiconductor chip mounting area 31 indicated by the dotted line on the right side portion of the lower glass substrate formation region. The upper end portion of the signal line 26 is connected to the short line 29. The lower end of the signal line 26 extends to the inside of the semiconductor chip mounting area 32 indicated by the dotted line on the lower side of the lower glass substrate formation region. The right end of the storage capacitor line 27 is connected to one of the input lines 28 via a common line 33. One end of the input line 28 is connected to the short line 29. The other end of the input line 28 extends into the semiconductor chip mounting areas 31 and 32.
[0007]
Next, a case where static electricity is generated when the alignment film is rubbed in the manufacturing process of the liquid crystal display panel 11 will be described. In this case, since all the lines 25 to 28 in the lower glass substrate formation region surrounded by the cut line 22 are connected to the short line 29, if the short line 29 is grounded, the generated static electricity is discharged. It can be removed quickly. Therefore, electrostatic breakdown can be prevented from occurring in the thin film transistor 24 and the like. Then, after the predetermined process is completed, cutting is performed along the cut line 22.
[0008]
[Problems to be solved by the invention]
However, the liquid crystal display module including the liquid crystal display panel 11 obtained as described above has the following problems. That is, when cut along the cut line 22, the right end portion of the scanning line 25, the upper end portion of the signal line 26, and one end portion of the input line 28 are exposed on the end surfaces of the respective sides of the lower glass substrate 12. As a result, when static electricity is applied from the outside to the flexible wiring board 17 in a state where the shield cases 1 and 3 are not grounded, the end faces of the lines 25, 26, and 28 on each side of the lower glass substrate 12 Discharge occurs between the side walls 2 of the shield case 1. Further, when the flexible wiring board 17 is grounded in a state where static electricity is generated in both the shield cases 1 and 3, the end face of each line 25, 26, 28 on each side of the lower glass substrate 12 and the lower shield case are also provided. Discharge occurs between the side wall 2 of the first one. When such discharge occurs, electrostatic breakdown may occur in the thin film transistor 24 and the semiconductor chip 16. In addition, when a discharge occurs through several lines, the current may flow too much, causing the line to melt and break.
Therefore, conventionally, in order to prevent such electrostatic breakdown, although not shown, a resin molded product is inserted between the lower glass substrate 12 and the side wall 2 of the lower shield case 1 or an insulating resin is used. However, there is a problem that not only the weight of the entire module increases, but also the cost increases.
An object of the present invention is to enable prevention of electrostatic breakdown with a simpler configuration.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is a liquid crystal display module in which a liquid crystal display panel having a scanning line, a signal line, and a storage capacitor line is housed in a conductive shield case. The liquid crystal display panel is extended to an end surface of one predetermined side, and each predetermined one end portion of the scanning line and the signal line is extended to one end surface of the remaining three sides of the liquid crystal display panel, and the accumulation Impedance between the end face of the predetermined end of the capacitor line and the shield case is made smaller than the impedance between the end face of the predetermined end of the scanning line and the signal line and the shield case. It is.
According to a second aspect of the present invention, in the first aspect of the present invention, the distance between the end face of the predetermined end of the storage capacitor line and the side wall of the shield case is a predetermined end of each of the scanning line and the signal line. It is made to become smaller than each space | interval between a part end surface and the side wall of the said shield case.
[0010]
According to the first aspect of the present invention, when a discharge is about to occur between the liquid crystal display panel and the shield case, the discharge is generated only between the predetermined end surface of the storage capacitor line having a low impedance and the shield case. Will occur. However, since the storage capacitor line is not connected to the thin film transistor or the like, the influence of the discharge is not exerted on the thin film transistor or the like, so that the thin film transistor or the like can be protected from electrostatic breakdown. In this case, as in the second aspect of the invention, the distance between the predetermined end surface of the storage capacitor line and the side wall of the shield case is set so that the predetermined end surface of each scanning line and signal line and the side wall of the shield case. The impedance between the end face of the predetermined end of the storage capacitor line and the shield case is less than the distance between each end of the scan line and the signal line. Therefore, it is possible to prevent electrostatic breakdown with a simpler configuration.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a view for explaining a liquid crystal display module according to an embodiment of the present invention, and shows a plan view in a state where a metal upper shield case and a flexible wiring board are removed. In this figure, parts having the same names as those in FIGS. 6 and 8 are denoted by the same reference numerals, and description thereof is omitted as appropriate. The liquid crystal display panel 11 in this embodiment is different from the conventional liquid crystal display panel 11 shown in FIGS. 6 and 8 in that the left end portion of the storage capacitor line 27 extends to the end surface of the left side of the lower glass substrate 12. Others are the same. In this embodiment, the distance between the left side of the liquid crystal display panel 11 and the left side wall 2 of the metal lower shield case 1 is the right side, upper side and lower side of the liquid crystal display panel 11 and the right side wall of the lower shield case 1. 2, each space | interval between the upper side wall 2 and the lower side wall 2 is smaller. As an example, the distance between the left side of the liquid crystal display panel 11 and the left side wall 2 of the lower shield case 1 is about 0.3 to 0.5 mm, the right side, the upper side and the lower side of the liquid crystal display panel 11 and the right side of the lower shield case 1. Each space | interval between the wall 2, the upper side wall 2, and the lower side wall 2 is about 0.8-1.0 mm.
[0012]
Thus, in this liquid crystal display module, the distance between the left side of the liquid crystal display panel 11 and the left side wall 2 of the lower shield case 1 is set to the right side, the upper side and the lower side of the liquid crystal display panel 11 and the right side wall 2 of the lower shield case 1. Therefore, the impedance between the left end portion of the storage capacitor line 27 and the left side wall 2 of the lower shield case 1 is the remaining three lines. It becomes smaller than each impedance between each predetermined one end face of each of 25, 26, and 28 and each side wall 2 of the lower shield case 1. As a result, when a discharge is about to occur between the liquid crystal display panel 11 and the lower shield case 1, the discharge is made only between the left end face of the storage capacitor line 27 having a low impedance and the left side wall 2 of the lower shield case 1. Will occur. In this case, since the storage capacitor line 27 is not connected to the thin film transistor (not shown) or the semiconductor chip 16, there is no influence on the thin film transistor or the semiconductor chip 16. It can protect against electric breakdown. Further, since the plurality of storage capacitor lines 27 are connected to each other through, for example, the common line 33 shown in FIG. 8, they have the same potential, and the current flows in a distributed manner through all the storage capacitor lines 27. It is possible to prevent melting due to excessive current flow in each storage capacitor line 27. Note that a plurality of storage capacitor lines 27 may be connected to each other via a common line in the vicinity of the end face of the left end portion.
[0013]
By the way, in this liquid crystal display module, the distance between the left end portion end surface of the storage capacitor line 27 and the left side wall 2 of the lower shield case 1 is set to be lower than the predetermined end portion end surfaces of the remaining three lines 25, 26, 28. The impedance between the left end wall of the storage capacitor line 27 and the left side wall 2 of the lower shield case 1 is reduced to the remaining three lines 25 only by making the distance between the side walls 2 of the shield case 2 smaller than each interval. It is possible to make the impedance smaller than the respective impedances between the respective end faces of the predetermined end portions 26 and 28 and the respective side walls 2 of the lower shield case 1. Therefore, it is possible to prevent electrostatic breakdown with a simpler configuration, and as a result, the weight of the entire module can be reduced and the cost can be reduced.
[0014]
2 and 3, the flat portion of the lower shield case 1 is disposed between the left side of the liquid crystal display panel 11 (the end surface of the left end portion of the storage capacitor line) and the left side wall 2 of the lower shield case 1. A protrusion 41 is provided, and the distance between the protrusion 41 and the left side of the liquid crystal display panel 11 (the left end face of the storage capacitor line) is the remaining three sides of the liquid crystal display panel 11 (the remaining three lines). May be made smaller than each interval between each predetermined one end face) and each side wall 2 of the lower shield case 1. Further, as in the embodiment shown in FIG. 4, a metal plate, a conductive rubber plate, a conductive layer is provided between the left side of the liquid crystal display panel 11 (the end surface of the left end of the storage capacitor line) and the left side wall 2 of the lower shield case 1. A conductive member 42 made of a resin plate or the like is provided in close contact with the inner surface of the left side wall 2, and the distance between the conductive member 42 and the left side of the liquid crystal display panel 11 (the left end portion end surface of the storage capacitor line) is the rest of the liquid crystal display panel 11. You may make it become smaller than each space | interval between three sides (each predetermined end part end surface of remaining three lines) and each side wall 2 of the lower shield case 1. FIG. Further, a protrusion 41 as shown in FIGS. 2 and 3 may be provided on the left side wall 2 of the lower shield case 1, and a conductive member 42 as shown in FIG. 4 is separated from the left side wall 2 of the lower shield case 1. You may make it provide. Even when the conductive member 42 is provided, since the conductive member 42 is only provided in a part of the lower shield case 1, it is possible to prevent electrostatic breakdown with a simpler configuration, and as a result, the module The overall weight can be reduced and the cost can be reduced. Note that one end of the input line 28 shown in FIG. 1 may be extended to the end face on the right side of the lower glass substrate 12. Further, the lower shield case 1 and the upper shield case may be formed of a conductive resin or the like.
[0015]
【The invention's effect】
As described above, according to the present invention, for example, the distance between the predetermined end surface of the storage capacitor line and the side wall of the shield case is such that the predetermined end surface of each scanning line and signal line and the side wall of the shield case. The impedance between the end face of the predetermined end of the storage capacitor line and the shield case is reduced between the end face of the predetermined end of the scanning line and the signal line and the shield case. Since it is only necessary to make the impedance smaller than each impedance, it is possible to prevent electrostatic breakdown with a simpler configuration, thereby reducing the weight of the entire module and reducing the cost.
[Brief description of the drawings]
FIG. 1 is a plan view showing a liquid crystal display module according to an embodiment of the present invention, with an upper shield case and a flexible wiring board removed.
FIG. 2 is a plan view similar to FIG. 1 of a liquid crystal display module according to another embodiment of the present invention.
3 is a cross-sectional view taken along line XX in FIG.
FIG. 4 is a plan view similar to FIG. 1 of a liquid crystal display module according to still another embodiment of the present invention.
FIG. 5 is a plan view of a conventional liquid crystal display module.
6 is a plan view showing a state in which the upper shield case is removed in FIG. 5;
7 is a cross-sectional view taken along line YY in FIG.
8 is a view for explaining the manufacture of the liquid crystal display panel shown in FIG. 5, and is an equivalent circuit plane in a state where thin film transistors and the like are formed on a glass substrate having a size corresponding to a plurality of lower glass substrates. Figure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower shield case 2 Side wall 11 Liquid crystal display panel 25 Scan line 26 Signal line 27 Storage capacity line 28 Input line

Claims (6)

In a liquid crystal display module in which a liquid crystal display panel having a scanning line, a signal line, and a storage capacitor line is housed in a conductive shield case, a predetermined end of the storage capacitor line is a predetermined side of the liquid crystal display panel. The predetermined end portions of the scanning line and the signal line are extended to any one of the remaining three sides of the liquid crystal display panel, and the end surface of the predetermined end portion of the storage capacitor line is extended to the end surface of the storage capacitor line. The liquid crystal display module is characterized in that an impedance between the shield case and the shield case is smaller than impedances between the end faces of the predetermined end portions of the scanning line and the signal line and the shield case. 2. The invention according to claim 1, wherein the distance between the end face of the one end of the storage capacitor line and the side wall of the shield case is such that the end face of each predetermined end of the scanning line and the signal line and the side wall of the shield case. A liquid crystal display module characterized in that it is smaller than each interval between the two. In the first aspect of the present invention, a protrusion formed of a part of the shield case is provided between a predetermined end surface of the storage capacitor line and a side wall of the shield case, and the protrusion and the storage capacitor line The liquid crystal is characterized in that the distance between the end face of the predetermined one end is smaller than the distance between the end face of each predetermined end of the scanning line and the signal line and the side wall of the shield case. Display module. The conductive member connected to the shield case is provided between a predetermined one end face of the storage capacitor line and a side wall of the shield case, and the conductive member and the storage capacitor line are predetermined. The liquid crystal display is characterized in that the distance between the end face of one end of each of the scanning lines and the signal line is smaller than the distance between the end face of each predetermined end of the scanning line and the signal line and the side wall of the shield case. module. 5. The liquid crystal display panel according to claim 1, wherein the liquid crystal display panel is provided with an input line having a predetermined end portion extended to any one of the remaining three sides of the liquid crystal display panel. The relationship between the end face of the predetermined end of the input line and the shield case is the same as the relation between the end face of each end of the scanning line and the signal line and the shield case. module. 6. The liquid crystal display module according to claim 1, wherein the storage capacitor lines are connected to each other through a common line in the vicinity of an end face of the predetermined end portion.

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