JP2007129034A - Wiring board and liquid crystal module including the wiring board - Google Patents

Abstract

A wiring board suitable for narrowing a frame of a liquid crystal display device and a liquid crystal module incorporating the wiring board are provided.
An electric wiring for transmitting an electric signal and / or electric power is formed on a different surface and / or layer from a connection land that constitutes an electrical connection with another electronic member and / or an electric member. 2, a plurality of connection portions 221 where the connection lands 22 are formed are provided along the peripheral edge, and the through holes 24 that electrically connect the electrical wiring 21 and the connection lands 22 are dummy lands between the connection portions 221. It arrange | positions in the area | region provided with 23.
[Selection] Figure 2

Description

  The present invention relates to a wiring board and a liquid crystal module including the wiring board. In particular, the wiring board includes a wiring board suitable for distributing electric signals, electric power, and the like to a driver for driving a liquid crystal display panel, and the wiring board. The present invention relates to a liquid crystal module.

  A general liquid crystal module has a configuration in which a driving circuit or the like is connected to a liquid crystal display panel. A display device incorporating such a liquid crystal module transmits a control signal or the like generated by a control circuit board or the like to a drive circuit or the like, and the drive circuit or the like is a liquid crystal display panel based on the control signal or the like. Is configured to drive.

  FIG. 3 is an exploded perspective view schematically showing an example of a mounting structure of a conventional general liquid crystal module 90. The liquid crystal module 90 includes a liquid crystal display panel 91 and a plurality of TCP (Tape Carrier Package) 93 mounted on the peripheral portion of the liquid crystal display panel 91 and a peripheral portion of the liquid crystal display panel 91 as a driving circuit or the like. And a wiring substrate 92 disposed and connected to the TCP 93. A source driver or gate driver 931 for driving the liquid crystal display panel 91 is mounted on each TCP 93. For example, an anisotropic conductive film (ACF) 94 is used for connection between each TCP 93 and the wiring substrate 92.

  The wiring board 92 is formed in an elongated and substantially rectangular shape, and is provided with a plurality of electric wirings 921 for transmitting various electric signals and electric power, and connection portions 925 for connecting to the TCPs 93. The electrical wiring 921 is an elongated conductor disposed along the longitudinal direction of the wiring substrate 92, and a plurality of electrical wirings 921 are generally formed in parallel. The connection unit 925 includes a predetermined number of connection lands 922 for connecting to each TCP 93 and is provided at a position facing the liquid crystal display panel 91. In addition, a dummy land 923 for improving the adhesion between the wiring substrate 92 and the anisotropic conductive film 94 is formed between the connection portions 925. An anisotropic conductive film (ACF) 94 is attached to the surfaces of the connection land 922 and the dummy land 923, and the wiring substrate 92 and each TCP 93 are electrically connected by the anisotropic conductive film 94.

  As the wiring board 92, as shown in FIG. 3, the wiring board 92 and the connection land 922 may be formed on different surfaces or layers. In such a wiring board 92, the electrical wiring 921 and the connection land 922 are generally electrically connected by a through hole 924. In order to prevent the adhesion between the wiring substrate 92 and the anisotropic conductive film 94 from decreasing, the through hole 924 conventionally has a region where the anisotropic conductive film 94 is attached, that is, a region where the dummy land 923 is formed. Avoid it. Therefore, in order to avoid interference between the through hole 924 and the dummy land 923, the electrical wiring 921 and the dummy land 923 are arranged so that there is a portion that does not overlap each other.

  As a result, a region 926 where the electrical wiring 921 is not provided is present on the surface or layer where the electrical wiring 921 is formed. For this reason, the width dimension of the wiring substrate 92 is a dimension obtained by adding the width dimension necessary for forming the electrical wiring 921 and the width dimension necessary for forming the connection land 922 or the dummy land 923.

JP 58-87582 A JP-A-4-218933

  By the way, recently, the frame of a liquid crystal display device has been narrowed, that is, the outer frame attached to the liquid crystal display panel has been reduced in size and width, and the wiring board attached to the peripheral portion of the liquid crystal display panel has been downsized or reduced. There is a demand for narrowing. Further, since the size of the wiring board affects the price, there is also a demand for making the wiring board as small as possible.

  However, the width dimension of the wiring board is as described above so that the through hole and the dummy land do not interfere with each other. For this reason, it has been difficult to reduce the width of the wiring board.

  In view of the above circumstances, the problem to be solved by the present invention is to provide a wiring board that can be reduced in size and reduced in price, or a wiring board or liquid crystal that can reduce the frame of a display device. Is to provide modules.

  In order to solve such a problem, according to the present invention, in a configuration in which the electrical wiring is formed on a surface and / or layer different from the connection land, a plurality of regions where the connection land is formed are provided along the peripheral edge of the wiring substrate. In other words, the gist is that a through hole for electrically connecting the electrical wiring and the connection land is formed between the regions where the connection lands are formed. The electrical wiring is formed on a predetermined surface and / or layer (for example, a surface layer or an internal layer) of the wiring board, and transmits electrical signals and / or electric power. The connection land is mainly for constituting a connection with another electronic member and / or an electric member. The other electronic member / electric member refers to, for example, a circuit board (including a film-like member).

  A configuration may be employed in which dummy lands are formed between regions where connection lands are formed.

  The present invention can also be expressed as follows. That is, in a wiring board including a connection land for configuring connection with another electronic member and / or an electric member via an anisotropic conductive film, a through hole for electrically connecting the electric wiring and the connection land is provided. The gist is that the connection land is not formed in the region where the anisotropic conductive film is attached. The electrical wiring, connection lands, other electronic members and / or electrical members are the same as described above.

  And the structure by which a dummy land is formed in the site | part in which a connection land is not formed among the area | regions which affix an anisotropic conductive film may be sufficient.

  The liquid crystal module according to the present invention has a configuration in which a TCP on which a driver for driving a liquid crystal display panel is mounted is connected to the liquid crystal display panel, and further, the wiring board is connected to the TCP via an anisotropic conductive film. Prepare.

  According to the present invention, by providing a through hole between regions where connection lands are formed, the electrical wiring can be disposed so as to overlap between regions where connection lands and connection lands are formed. For this reason, the area | region for avoiding the superimposition with the area | region between an electrical wiring and a connection land or a connection land becomes unnecessary, and can reduce the dimension of a board | substrate. Further, by reducing the area of the wiring board, the price of the wiring board can be reduced.

  In addition, by providing a through hole in a region where the connecting land is not provided in the region where the anisotropic conductive film is attached, the electric wiring is arranged so as to overlap the region where the anisotropic conductive film is attached. Can be set. For this reason, the area | region for avoiding the overlap with the area | region where an anisotropic conductive film is affixed becomes unnecessary, and the dimension of a board | substrate can be reduced. Further, by reducing the area of the wiring board, the price of the wiring board can be reduced.

  When such a wiring board or liquid crystal module is incorporated in a display device, the space for storing the wiring board can be reduced. For this reason, it is possible to reduce the frame of the display device, that is, to reduce the size or width of the frame that supports the liquid crystal display panel.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an external perspective view showing wiring boards 12a and 12b according to an embodiment of the present invention and a liquid crystal module 1 in which the wiring boards 12a and 12b are incorporated.

  As shown in FIG. 1, a liquid crystal module 1 according to an embodiment of the present invention includes a liquid crystal display panel 11, wiring boards 12a and 12b, and TCPs 13a and 13b. The wiring boards 12a and 12b are configured so that control signals, power, and the like generated by an external control circuit board (not shown) (for example, incorporated in a display device) can be distributed to the TCPs 13a and 13b. . Details of the wiring boards 12a and 12b will be described later. The TCPs 13 a and 13 b are film-like circuit boards that drive the liquid crystal display panel 11, for example, and are attached to the long side and the short side of the liquid crystal display panel 11. The source driver 131a is mounted on the TCP 13a mounted on one side (generally the long side) of the liquid crystal display panel 11, and the gate driver 131b is mounted on the TCP 13b mounted on the other side (generally the short side). An anisotropic conductive film 14 is used for connection between the wiring boards 12a and 12b and the TCPs 13a and 13b.

  Since the liquid crystal display panel 11 and the TCPs 13a and 13b can be conventional ones, a detailed description of their configuration and operation is omitted.

  FIG. 2 is a partially exploded perspective view schematically showing an enlarged mounting structure of the wiring boards 12a and 12b according to the embodiment of the present invention and the liquid crystal module 1 in which the wiring boards 12a and 12b are incorporated. The wiring substrate 12a disposed along the long side of the liquid crystal display panel 11 and the wiring substrate 12b disposed along the short side are distinguished from each other because the portions described below have substantially the same configuration. I will explain it together.

  The wiring boards 12a and 12b are formed in an elongated and substantially rectangular shape. These wiring boards 12a and 12b are provided with a plurality of electric wirings 21 capable of transmitting electric signals, electric power, and the like, and connection lands 22 for configuring connections with the TCPs 13a and 13b. In the following description, a region in which a group of connection lands 22 connected to one TCP is formed is referred to as a “connection portion 221”.

  The electrical wiring 21 is an elongated conductor disposed along the longitudinal direction of the wiring boards 12a and 12b, and a plurality of electrical wirings are generally disposed in parallel. FIG. 2 shows a configuration in which the electrical wiring 21 is formed on the surfaces of the wiring boards 12a and 12b. However, the electrical wiring 21 is not limited to the surface, but is formed on the inner layer or the surface and the inner layer. May be. Also, the number, size, and shape of the electrical wiring 21 are design items that are appropriately designed according to the type and number of electrical signals and power to be transmitted, and are not limited to the configuration shown in FIG.

  The connection unit 221 is formed so that a plurality of rectangular connection lands 22 are arranged at a predetermined interval, and is provided at a position where the connection unit 221 is connected to each of the TCPs 13a and 13b. The number, size, and shape of the connection lands 22 of each connection portion 221 are appropriately determined according to the electrical signal and power transmitted to each TCP 13a, 13b, and the size / shape of each TCP 13a, 13b to be connected. It is.

  A dummy land 23 is formed in a region between the connection portions 221. The dummy land 23 has substantially the same configuration as the connection land 22. For this reason, the wiring boards 12 a and 12 b have a configuration in which rectangular connection lands 22 and dummy lands 23 are arranged in a comb shape at the peripheral edge of the long side facing the liquid crystal display panel 11. A region where the connection land 22 and the dummy land 23 are provided is a region where the anisotropic conductive film 14 is attached.

  The predetermined electrical wiring 21 and the predetermined connection land 22 are electrically connected through the through holes 24, respectively. Thereby, the electric signal, electric power, etc. transmitted to the electric wiring 21 can be transmitted to the connection land 23 through the through hole 24 and distributed to the TCPs 13a and 13b. The through hole 24 can employ a conventional general structure. For example, a structure in which a hole communicating the surface where the connection land 22 is formed and the surface where the electric wiring 21 is formed is formed, and a plated layer of a conductor such as copper is formed on the inner wall surface of the hole is applied. it can.

  Of these through holes 24, electrical wiring 21 (electrical wiring denoted by reference numerals 21 a, 21 b, and 21 c in FIG. 2) disposed in the vicinity of the side facing the liquid crystal display panel 11, the connection land 22, Through holes 24 (through holes denoted by reference numerals 24a, 24b, and 24c in FIG. 2) are provided between the connection portions 221, that is, in a region where the dummy land 23 is formed. .

  When the through hole 24 for connecting the electrical wiring 21 and the connection land 23 is formed in the region between the connection portions 221, that is, in the region where the dummy land 23 is formed, at least the dummy land 23 and the electrical wiring. 21 is not required to be superimposed. Therefore, there is no need to provide a region (see FIG. 3, a region denoted by reference numeral 926) where the electrical wiring 21 is not provided on the surface where the electrical wiring 21 is formed as in the prior art. As a result, the width dimension of the wiring boards 12a and 12b can be reduced by the width of this region, and the length of the short side of the wiring boards 12a and 12b is set to the minimum dimension necessary for forming the electric wiring 21, for example. be able to.

  This configuration can also be expressed as follows. In order to reduce the width of the wiring boards 12a and 12b, it is necessary to eliminate a region (see FIG. 3) where the electric wiring 21 is present on the surface where the electric wiring 21 is formed. However, if this region is eliminated and the electrical wiring 21 exists over almost the entire width of the wiring boards 12a and 12b, at least a part of the plurality of electrical wirings 21 overlaps the connection land 22 and the dummy land 231. . In the configuration shown in FIG. 2, the electrical wirings 21 a, 21 b, and 21 c located near the long side facing the liquid crystal panel 11 correspond. Therefore, in the through holes 24a, 24b, and 24c that electrically connect the electrical wirings 21a, 21b, and 21c and the predetermined connection land 22, the dummy lands 23 are formed between the connection portions 221. Provide in the area.

  At this time, these through holes 24a, 24b, 24c or through holes 24a, 24b, 24c and a specific dummy land 23 that interferes with the conductor 25 that connects the connection land 22 (in FIG. 2, reference numerals 23a, 23b, 23c are It is preferable to leave the interfering portion as it is, for example, without removing the entire dummy land), and removing it as much as possible. For example, as in the dummy lands 23a, 23b, and 23c, the length is shortened so as not to interfere with the through holes 24a, 24b, and 24c. By suppressing the decrease in the number and area of the dummy lands 23 to a minimum, it is possible to prevent a decrease in the adhesion between the wiring substrate 12 and the anisotropic conductive film 14.

  It should be noted that the number of through holes provided in the region between the connection portions 221 is not limited to the configuration shown in FIG. 2 or the above configuration.

  According to such a configuration, the width dimension of the wiring boards 12a and 12b can be reduced, so that the area and the price of the wiring boards 12a and 12b can be reduced. In addition, since the region where the anisotropic conductive film is affixed, in other words, the region between the connection lands and the regions where the connection lands are formed, can be used effectively, the degree of freedom in routing the electrical wiring is improved.

  The assembly of the wiring boards 12a and 12b to the liquid crystal module 1 is as follows. The anisotropic conductive film 14 is attached to the region where the connection lands 22 and the dummy lands 23 of the wiring boards 12a and 12b are formed, in other words, the peripheral edge of the long side facing the liquid crystal display panel 11, and then anisotropically The separator (not shown) of the conductive film 14 is peeled off. Although some of the dummy lands 23a, 23b, and 23c are cut out, there is no influence on the adhesion of the anisotropic conductive film 14 as a whole, and the separator is peeled off from the anisotropic conductive film 14. At this time, the anisotropic conductive film 14 is not peeled off from the wiring board 12. Then, the TCPs 13a and 13b are positioned and attached to the anisotropic conductive film 14, and bonded by pressing and heating.

  With the liquid crystal module 1 to which such wiring boards 12a and 12b are connected, the space for storing the wiring boards 12a and 12b can be reduced when incorporated in a display device. For this reason, it is possible to reduce the frame of the display device.

  Conventionally, in order to narrow the frame of the display device, a configuration in which the TCPs 13a and 13b and the wiring boards 12a and 12b mounted on the liquid crystal display panel 11 are erected on the back side may be used. However, even without such a configuration, the frame size of the display device can be reduced by reducing the width dimensions of the wiring boards 12a and 12b. This facilitates the assembly of the display device.

  In the above-described embodiment, the wiring board having the configuration in which the electrical wiring is provided on the surface opposite to the surface on which the connection land and the dummy land are provided is shown, but the present invention is not limited to this configuration. For example, a configuration in which the electrical wiring is formed in an internal layer of the wiring board, or a configuration in which the electrical wiring is formed on the internal layer and the surface may be employed. Further, the number of internal layers in which the electrical wiring is formed is not limited. And in any of these structures, there can exist an effect similar to the said embodiment.

  In addition, in a wiring board having a plurality of surfaces and / or layers on which electrical wiring is formed, the electrical wiring and connection lands formed on a certain surface and / or layer are connected by a through hole. Alternatively, it is necessary to provide a portion where the electrical wiring of the layer and the electrical wiring of the other surface and / or the layer do not overlap and to form a through hole in the non-overlapping portion. In such a case, according to the present invention, this non-overlapping portion can be positioned in the region where the dummy land is formed. For this reason, the freedom degree of design of a wiring board can be raised.

  Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the present invention.

It is the external appearance perspective view which showed the structure of the liquid crystal module which concerns on embodiment of this invention. It is the partial exploded perspective view which showed typically the assembly structure of the liquid crystal module concerning the embodiment. It is the partial exploded perspective view which showed typically an example of the assembly structure of the liquid crystal module generally used conventionally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal module 11 Liquid crystal display panel 12a, 12b Wiring board 13a, 13b TCP
131 Driver 14 Anisotropic Conductive Film 21 Electrical Wiring 22 Connection Land 23 Dummy Land 24 Through Hole 25 Conductor Connecting Through Hole with Connection Land

Claims (5)

  A wiring board in which at least a part of electric wiring for transmitting an electric signal and / or electric power is formed on a different surface and / or layer from a connection land constituting connection with another electronic member and / or electric member, A plurality of regions where the connection lands are formed are provided along the peripheral edge of the wiring board, and through holes for electrically connecting the electrical wiring and the connection lands are formed between the regions where the connection lands are formed. A wiring board characterized in that it is provided.   2. The wiring board according to claim 1, wherein dummy lands are formed between regions where the connection lands are formed.   A wiring board including a connection land that constitutes an electrical connection with another electronic member and / or an electrical member via an anisotropic conductive film, the electrical wiring transmitting an electric signal and / or power and the connection land A wiring board characterized in that a through hole for electrically connecting the two is provided in a portion where a connection land is not formed in a region where an anisotropic conductive film is attached.   4. The wiring board according to claim 3, wherein a dummy land is formed in a portion where the connection land is not formed in the region where the anisotropic conductive film is pasted. The liquid crystal display panel, a TCP on which a driver for driving the liquid crystal display panel is mounted, and the TCP are connected via an anisotropic conductive film to transmit electric signals and / or electric power. 4. A liquid crystal module comprising a wiring board, comprising the wiring board according to any one of 4 above.

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