JP3653981B2 - Mounting structure of liquid crystal device and electronic device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting structure for mounting a liquid crystal device on various electronic devices. The present invention also relates to an electronic device configured using the mounting structure.
[0002]
[Prior art]
Currently, liquid crystal devices are widely used as display units for displaying visible information in various electronic devices such as mobile phones and electronic notebooks. This liquid crystal device generally includes a connection terminal for connection to an external device, and is mounted on the electronic device by connecting the connection terminal to an output terminal on the electronic device side.
[0003]
As such a mounting structure, a structure shown in FIG. 10, for example, is conventionally known. The conventional mounting structure shown here is a mounting structure for mounting a liquid crystal device including a liquid crystal panel 71, a backlight 72, and a case 73 on a frame substrate 74 constituting an electronic device.
[0004]
The liquid crystal panel 71 is formed by bonding the translucent substrates 76a and 76b, and substrate-side terminals 77 are formed on the surface of the translucent substrate 76a that protrudes outside the translucent substrate 76b. . In addition, device-side terminals 78 are formed on the surface of the frame substrate 74 of the electronic device.
[0005]
In the conventional mounting structure shown in FIG. 10, the output side of the liquid crystal driving IC 79 is conductively connected to the substrate side terminal 77 using, for example, an ACF (Anisotropic Conductive Film) (not shown) and the input side of the liquid crystal driving IC 79. Is formed by mounting a liquid crystal driving IC 79 on a base film 63 on which a wiring pattern 62 is formed by a TAB (Tape Automated Bonding) mounting technique. (Tape Carrier Package) 61 is used for mounting.
[0006]
[Problems to be solved by the invention]
However, in the above conventional mounting technology, the device side terminal 78 on the electronic device side is disposed on the back side of the liquid crystal panel 71 and far away from the substrate side terminal 77, and therefore supports the liquid crystal driving IC 79. The TCP 61 must be disposed on the back side of the liquid crystal panel 71, resulting in a problem that the height H of the liquid crystal device becomes very high. Further, since the input terminal 27b of the TCP 61 and the device-side terminal 78 are soldered, the man-hours are increased, which hinders automatic assembly of electronic devices.
[0007]
The present invention has been made in view of the above-described problems related to conventional mounting technology, and provides a mounting structure and an electronic apparatus for a liquid crystal device that can achieve space saving in the height direction and have high assembly rationality. With the goal.
[0008]
[Means for Solving the Problems]
(1) In order to achieve the above object, a mounting structure of a liquid crystal device according to the present invention includes a pair of substrates on which at least one substrate-side terminal is formed and a liquid crystal sealed between the substrates. In a mounting structure for mounting a liquid crystal device to be mounted on an electronic device provided with a device side terminal, a flexible structure including an output terminal conductively connected to the substrate side terminal and an input terminal conductively connected to the device side terminal And an elastic connector for conductively connecting the input terminal of the flexible wiring member and the device side terminal.
[0009]
The device-side terminal and the board-side terminal are arranged so as to face each other, the flexible wiring member is bent so that the input terminal is placed at a position facing the device-side terminal, and The input terminal of the flexible wiring member and the device side terminal are conductively connected by the elastic connector.
[0010]
As the flexible wiring member, for example, a TCP (Tape Carrier Package) formed by mounting an IC chip on a flexible printed board on which a wiring pattern is formed by a TAB (Tape Automated Bonding) mounting technique, ACF ( COF (Chip On Film) formed by mounting an IC chip on a sheet-like flexible printed board using a conductive adhesive such as Anisotropic Conductive Film, etc. A wiring member having an arbitrary structure is conceivable.
[0011]
As the elastic connector, for example, a rubber connector as shown in FIG. 5 or a spring connector as shown in FIG. 6 can be used.
[0012]
According to the mounting structure of the liquid crystal device configured as described above, the substrate-side terminal and the device-side terminal are arranged in a positional relationship facing each other, and the input terminal of the flexible wiring member is opposed to the device-side terminal. Since the input terminal and the device side terminal are connected by the elastic connector, the flexible wiring member is arranged only in the lateral region of the liquid crystal device, and is drawn around the back side of the liquid crystal device. There is no need. As a result, the overall shape of the liquid crystal device can be kept low.
[0013]
(2) Regarding the mounting structure having the above configuration, the flexible wiring member bent between the board-side terminal and the equipment-side terminal protrudes in the lateral direction of the liquid crystal device, and thus the planar direction of the liquid crystal device (that is, the liquid crystal device) It is conceivable that the size in the direction perpendicular to the height direction of the image increases. In order to solve this problem, a flexible wiring member having one end connected to the substrate side terminal and the other end connected to the device side terminal intersects with the substrate of the liquid crystal device, preferably at an angle of 90 °. It is desirable to bend in the direction. Thereby, it can prevent that a flexible wiring member protrudes largely in the plane direction of a liquid crystal device.
[0014]
(3) Next, an electronic apparatus according to the present invention includes a liquid crystal device including a pair of substrates on which at least one substrate-side terminal is formed, and liquid crystal sealed between the substrates, and the substrate side In an electronic device having a device-side terminal conductively connected to a terminal and a mounting structure for mounting the liquid crystal device, the mounting structure is the mounting structure of the liquid crystal device described in (1) or (2) above. It is characterized by being.
[0015]
According to this electronic apparatus, since the liquid crystal device can be formed small in the height direction, the overall shape of the electronic apparatus can be reduced accordingly. In addition, when the overall shape of the electronic device is maintained as it is, the internal space can be given a margin.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
FIG. 1 shows an embodiment of a liquid crystal device configured using the liquid crystal device mounting structure according to the present invention. The liquid crystal device 1 shown here is configured by mounting a liquid crystal driving IC 3 and a backlight unit 4 on a liquid crystal panel 2 and storing them in a case 6. Locking pieces 7 are formed at the bottom of the side surface of the case 6, and these locking pieces 7 are fitted into locking holes 9 provided in the frame substrate 8 of the electronic device, so that as shown in FIG. The backlight unit 4 is installed at a predetermined position on the frame substrate 8.
[0017]
The liquid crystal device 2 includes a pair of translucent substrates 11a and 11b facing each other and a liquid crystal 12 sealed in a so-called cell gap formed between the substrates. The translucent substrates 11a and 11b are made of, for example, glass or plastic. Moreover, translucent electrodes 13a and 13b are formed on the inner surfaces of the translucent substrates 11a and 11b, respectively. In the figure, the tip (right end in the figure) of the translucent electrode 13 a located on the upper side constitutes the substrate-side terminal 14. The translucent electrode 13b on the lower side of the figure constitutes a substrate-side terminal in the rear side portion of the figure (not shown), or a conductive material (not shown) provided between the translucent substrate 11a and the translucent substrate 11b. ) To the board side terminal 14.
[0018]
An alignment film (not shown) is further formed on each of the translucent electrodes 13a and 13b, and an alignment process such as a rubbing process is performed on these alignment films. Moreover, the polarizing plate 16 is affixed on the outer surface of each translucent board | substrate 11a and 11b.
[0019]
Returning to FIG. 1, the backlight unit 4 includes a light guide 17 formed of, for example, polycarbonate or acrylic, a plurality of light emitting diodes 18 disposed at one end of the light guide 17, and the light guide 17. The light reflecting surface 19 is attached to the surface opposite to the light emitting surface 17a. Device-side terminals 21 extending from a host control unit on the electronic device side are provided on the surface of the frame substrate 8 which is a component of the electronic device such as a mobile phone. Further, an EL element may be used instead of the backlight unit 4.
[0020]
A mounting structure 22 for mounting the liquid crystal device 1 on the frame substrate 8 of the electronic device includes a TCP 23 as a flexible wiring member and a rubber connector 24 as an elastic connector. The TCP 23 is formed by using a well-known TAB mounting technique. As shown in FIG. 3, the TCP 23 is used for driving a liquid crystal at an appropriate position of a wiring pattern 27 formed on the carrier film 26 through an adhesive (not shown). It is formed by bonding IC3. Reference numeral 28 denotes an insulating solder resist, reference numeral 29 denotes a protective film formed of polyimide or the like, and reference numeral 31 denotes a resin mold.
[0021]
One end of the wiring pattern 27 on the liquid crystal device side constitutes an output terminal 27a, and one end of the wiring pattern 27 on the electronic device side constitutes an input terminal 27b. In the present embodiment, the substrate-side terminal 14 formed on the surface of the translucent substrate 11a of the liquid crystal device 1 and the device-side terminal 21 formed on the surface of the frame substrate 8 of the electronic device are in a positional relationship facing each other. Be placed. The output terminal 27a of the TCP 23 is conductively connected to the board-side terminal 14 by an anisotropic conductive adhesive, for example, ACF (Anisotropic Conductive Film) 32. The TCP 23 is further bent so that the input terminal 27 b is placed at a position facing the device-side terminal 21, and in this state, the TCP 23 is bonded by the double-sided adhesive tape 33.
[0022]
In FIG. 1, a rubber connector 24 is disposed on a device-side terminal 21 formed on a frame substrate 8 of an electronic device, and the liquid crystal panel 2 to which a TCP 23 is connected is disposed at a predetermined position. When fitted into the frame substrate 8, the input terminal 27 b of the TCP 23 is automatically conducted to the device side terminal 21 by the rubber connector 24. The rubber connector 24 can be provided alone on the frame substrate 8 or can be supported by the light guide 17 of the backlight unit 4.
[0023]
As shown in FIG. 5A, the rubber connector 24 includes an elastic base 35 formed in an approximately rectangular parallelepiped shape by an elastic material having electrical insulation, for example, silicon rubber, and the elastic base 35 is parallel to each other. And a large number of conductive portions 36 provided. The upper and lower ends of each conductive portion 36 are exposed to the outside of the elastic base portion 35. Further, the gap between the two conductive portions 36 adjacent to each other is a non-conductive portion made of an elastic material. That is, the pitch W between the conductive parts is maintained at about 30 μm to 50 μm, for example. In FIG. 1, the plurality of input terminals 27 b provided at the end of the TCP 23 and the plurality of device-side terminals 21 provided on the frame substrate 8 are individually conductively connected by the individual conductive portions 36 of the rubber connector 24. The
[0024]
As described above, in this embodiment, as shown in FIG. 3, the board-side terminal 14 and the device-side terminal 21 are arranged so as to face each other, the TCP 23 connected to the board-side terminal 14 is bent, and the input terminal 27 b is The input terminal 27 b and the apparatus side terminal 21 are electrically connected to each other by the rubber connector 24. With this configuration, it is sufficient that the TCP 23 is disposed in a side region of the liquid crystal panel 2, and it is not necessary to turn the TCP 23 on the back side of the liquid crystal panel 2. As a result, the overall height dimension of the liquid crystal device 1 can be kept low.
[0025]
FIG. 5B shows a rubber connector 54 which is a modified example of the elastic connector. The rubber connector 54 includes an elastic base portion 35 and a conductive portion 36, similarly to the rubber connector 24 of FIG. The rubber connector 54 is different from the rubber connector 24 of FIG. 5A in that the cross section of the elastic base 35 is formed in a horizontal U shape, and the conductive portion 36 is formed in a horizontal U shape on the outer peripheral surface thereof. That is.
[0026]
FIG. 6 shows a spring connector which is a modified example of the elastic connector. The spring connector 34 can be used in place of the rubber connector 24 shown in FIG. The spring connector 34 shown here includes a plurality of spring terminals 37 arranged in parallel to each other, and a case 38 that houses these spring terminals 37. The fixed terminal 37 a of the spring terminal 37 protrudes from the side surface of the case 38 to the outside, and the movable terminal 37 b protrudes from the upper surface of the case 38 to the outside. The movable terminal 37b can swing in the vertical direction in the figure according to the spring property of the spring terminal 37 itself.
[0027]
The spring connector 34 is fixed on the frame substrate 8 in a state where the fixed terminal 37a is conductively connected to the device side terminal 21 on the frame substrate 8 (FIG. 1) by soldering or the like. Then, the backlight unit 4 and the liquid crystal panel 2 are placed on the frame substrate 8 to which the spring connector 34 is fixed, and the case 6 is further fitted into the frame substrate 8. Then, the board side terminal 14 of the liquid crystal panel 2 automatically comes into contact with the movable terminal 37b of the spring connector 34 and further presses it downward. Since the spring terminal 37 itself has a spring property, the movable terminal 37 b pressurizes the board-side terminal 14 according to the spring property, and therefore, the stable and reliable between the movable terminal 37 b and the board-side terminal 14. Conductive connection is obtained.
[0028]
(Second Embodiment)
FIG. 4 shows another embodiment relating to the mounting structure of the liquid crystal device according to the present invention. This embodiment is different from the embodiment shown in FIG. 3 in that a flexible printed circuit (FPC) 25 having a two-layer structure is used instead of the TCP 23 as a flexible wiring member. The TCP 23 shown in FIG. 3 is obtained by forming a wiring pattern 27 on a carrier film 26 with Cu foil or the like through an adhesive layer, which is a so-called FPC having a three-layer structure. On the other hand, in the FPC 25 shown in FIG. 4, the wiring pattern 27 made of Cu foil or the like is directly formed on the carrier film 26 without using an adhesive.
[0029]
The liquid crystal driving IC 3 is face-down bonded using the ACF 30. Reference numeral 28 denotes a solder resist or an insulating coating, and reference numeral 31 denotes a resin mold.
[0030]
(Third embodiment)
FIG. 7 shows another embodiment relating to the mounting structure of the liquid crystal device according to the present invention. The difference between this embodiment and the embodiment shown in FIG. 3 is that the TCP 23 is bent in a direction that intersects the translucent substrates 11a and 11b, that is, a direction that intersects at an angle of approximately 90 ° in this embodiment. The output terminal 27 a is connected to the board side terminal 14 by the ACF 32, and the input terminal 27 b is connected to the equipment side terminal 21 by the rubber connector 24. According to this embodiment, it is possible to prevent the TCP 23 from projecting in the planar direction of the liquid crystal panel 2 (that is, the horizontal direction in the figure).
[0031]
(Fourth embodiment)
FIG. 8 shows an embodiment of an electronic apparatus according to the invention. This embodiment is an embodiment when the mounting structure of the liquid crystal device according to the present invention is applied to a mobile phone as an electronic device. The mobile phone shown here includes an upper case 41 and a lower case 42. The upper case 41 is provided with a transmitting / receiving antenna 43, a keyboard unit 44, and a microphone 46. The lower case 42 is provided with, for example, the liquid crystal device 1 shown in FIG. 1, a speaker 47, and a circuit board 48. The liquid crystal device 1 and the circuit board 48 are mounted on the frame board 8.
[0032]
On the circuit board 48, as shown in FIG. 9, the receiver 49 connected to the input terminal of the speaker 47, the transmitter 51 connected to the output terminal of the microphone 46, and the CPU are configured. A control unit 52 and a power supply unit 53 that supplies power to each unit are provided. The control unit 52 reads the states of the transmission unit 51 and the reception unit 49, supplies information to the liquid crystal driving IC 3 based on the results, and displays visible information such as characters and numbers in the display area of the liquid crystal device 1. . Further, the control unit 52 supplies information to the liquid crystal driving IC 3 based on the information output from the keyboard unit 44 and displays visible information in the display area of the liquid crystal device 1.
[0033]
(Other embodiments)
The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the embodiments, and various modifications can be made within the scope of the invention described in the claims.
[0034]
For example, in the embodiment shown in FIG. 1, a carrier tape constituting TCP is used as a flexible wiring member constituting the mounting structure. Instead, a COF (Chip On Film) or any other wiring member is used. Can be used.
[0035]
Further, in the embodiment shown in FIG. 8, the mounting structure according to the present invention is used to form a mobile phone. However, the mounting structure according to the present invention is used as a mounting structure constituting an arbitrary electronic device other than the mobile phone, such as a video camera. Mounting structure can be applied.
[0036]
【The invention's effect】
According to the mounting structure of the liquid crystal device and the electronic device according to the present invention, the board-side terminal and the device-side terminal are arranged in a positional relationship facing each other, and the input terminal of the flexible wiring member faces the device-side terminal. Since the input terminal and the device side terminal are connected to each other by an elastic connector, the flexible wiring member is merely disposed in the side region of the liquid crystal device and is turned around the back side of the liquid crystal device. As a result, the height of the overall shape of the liquid crystal device can be kept low.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of a liquid crystal device including a mounting structure according to the present invention.
2 is a cross-sectional view showing a cross-sectional structure of the liquid crystal device of FIG.
3 is an enlarged cross-sectional view showing a main part of FIG.
FIG. 4 is a cross-sectional view showing another embodiment of the mounting structure of the liquid crystal device according to the present invention.
FIG. 5 is a perspective view showing an example of an elastic connector.
FIG. 6 is a perspective view showing another example of an elastic connector.
FIG. 7 is a cross-sectional view showing still another embodiment relating to the mounting structure of the liquid crystal device according to the present invention.
FIG. 8 is an exploded perspective view showing one embodiment of an electronic apparatus according to the invention.
9 is a block diagram showing an example of an electric control system used in the electronic apparatus of FIG.
FIG. 10 is a cross-sectional view showing a conventional example related to a mounting structure of a liquid crystal device.
[Explanation of symbols]
1 Liquid Crystal Device 2 Liquid Crystal Panel 3 Liquid Crystal Drive IC
4 Backlight unit 6 Case 7 Locking piece 8 Frame substrate 9 Locking holes 11a and 11b Translucent substrate 12 Liquid crystal 13a and 13b Translucent substrate 14 Substrate side terminal 16 Polarizing plate 17 Light guide 17a Light emitting surface 18 Light emitting diode 19 Light Reflector 21 Equipment Side Terminal 22 Liquid Crystal Device Mounting Structure 23 TCP (Flexible Wiring Member)
24 Rubber connector (elastic connector)
26 Carrier film 27 Wiring pattern 27a Output terminal 27b Input terminal 28 Solder resist 29 Protective film 31 Resin mold 32 ACF
33 Double-sided adhesive tape 34 Spring connector 35 Elastic base part 36 Conductive part 37 Spring terminal 37a Fixed terminal 37b Movable terminal 38 Case H Height W Pitch between conductive parts

Claims (3)

In a mounting structure for mounting a liquid crystal device including a pair of substrates on which at least one substrate-side terminal is formed and a liquid crystal sealed between the substrates in an electronic device having the device-side terminal,
A flexible wiring member having an output terminal conductively connected to the substrate side terminal and an input terminal conductively connected to the device side terminal;
An elastic connector for conductively connecting the input terminal of the flexible wiring member and the device-side terminal;
The device-side terminal and the board-side terminal are arranged in a positional relationship facing each other, the flexible wiring member is bent so that its input terminal is placed at a position facing the device-side terminal, and the flexible terminal A mounting structure of a liquid crystal device, wherein an input terminal of a conductive wiring member and the device side terminal are conductively connected by the elastic connector. 2. The mounting structure of a liquid crystal device according to claim 1, wherein the flexible wiring member is conductively connected to the substrate-side terminal in a state where the flexible wiring member is bent in a direction intersecting the substrate of the liquid crystal device. A mounting structure of a liquid crystal device, wherein an input terminal is conductively connected to the device side terminal. A liquid crystal device including a pair of substrates on which at least one substrate-side terminal is formed, and a liquid crystal sealed between the substrates, a device-side terminal electrically connected to the substrate-side terminal, and the liquid crystal device In an electronic device having a mounting structure for mounting
The electronic device according to claim 1, wherein the mounting structure is a mounting structure for a liquid crystal device according to claim 1.

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