JP2005070811A - Liquid crystal display and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in which a conventional TAB type liquid crystal display increases in manufacture cost and decreases in yield since the liquid crystal display requires at least a TCP 3, a circuit board 6, and a cable 7 for input as components in addition to a liquid crystal cell 1 and therefore the number of components increases and the number of connections of them also increases to require a plurality of manufacturing processes and increase the man-hour. <P>SOLUTION: Not only a semiconductor chip for liquid crystal driving, but also all or some of other electronic components needed for a driving circuit for liquid crystal or control circuit for liquid crystal display are provided on the circuit board, whose output terminal is connected directly to a liquid crystal cell. Input terminals of the circuit board are connected directly to terminals of a main body substrate of electronic equipment mounted on a liquid crystal display through a flexible cable connected to the circuit board or through an anisotropic conductive film or by soldernig etc. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure of a liquid crystal display device, a structure for mounting the liquid crystal display device on a main body and various devices, and further relates to an electronic device including the liquid crystal display device.

  In general, a liquid crystal display device includes a liquid crystal cell having a liquid crystal layer sandwiched between two glass substrates, a drive circuit for driving the liquid crystal, a control circuit for controlling the liquid crystal display, a power source and an input signal. And a power supply circuit for supplying power. At present, the connection between the liquid crystal cell and the drive circuit is mainly performed by a TAB method in which TCP (tape carrier package) on which a liquid crystal drive semiconductor chip is mounted is collectively connected using TAB technology.

  FIG. 20 shows a typical example of a conventional liquid crystal display device employing such a TAB method. An output terminal of the TCP 4 on which the liquid crystal driving semiconductor chip 3 is mounted is directly connected to an input terminal provided along one side part 2 of the liquid crystal cell 1 by, for example, an anisotropic conductive film. An electronic component 5 other than the liquid crystal driving semiconductor chip, for example, a circuit board 6 on which a chip capacitor, a resistor, a controller, and the like are mounted is connected to the input terminal of the TCP 4 by soldering. The circuit board 6 is connected to an input cable 7 made of, for example, a flexible film wiring board, and the liquid crystal display device is connected to the electronic device main body to input power and signals.

  However, the conventional TAB type liquid crystal display device requires at least TCP3, a circuit board 6 and an input cable 7 as components other than the liquid crystal cell 1, so that the number of components is large and these are connected to each other. Therefore, the number of times of connection is increased, the number of manufacturing processes is increased, and the number of man-hours is increased, resulting in an increase in manufacturing cost and a decrease in yield. Further, since the input and output wirings are formed on the TCP, the circuit board and the input cable, respectively, the mounting area becomes very large, so-called frame portions become large, and the entire liquid crystal display device is enlarged. . In addition, in order to mount the liquid crystal display device, a large space must be secured in the electronic device, and there is a risk that the product design may be greatly restricted or the size may be increased more than necessary. In addition, there is a problem that the area of the display screen is small compared to the size of the entire apparatus, and a sufficient amount of information cannot be displayed. This has been a major obstacle in achieving downsizing, thinning, compactness, and high functionality, especially when a portable electronic device such as a mobile phone is commercialized.

  Other connection methods between the liquid crystal cell and the drive circuit include a rubber connection method using conductive rubber, a connection method using a heat seal or flexible film wiring board, and a liquid crystal drive semiconductor chip mounted directly on the glass substrate surface of the liquid crystal cell. A COG (chip on glass) method is known. Although the rubber connection method is easy to assemble, the output of the drive circuit is connected to the input of the liquid crystal cell with the conductive rubber, so it is difficult to cope with a narrow pitch, and the drive circuit board is placed on the back side of the liquid crystal cell. Therefore, there is a problem in that it is difficult to attach the backlight and the entire apparatus becomes thick.

  In the COG method recently employed, a liquid crystal driving semiconductor chip is directly mounted by patterning transparent ITO (indium tin oxide) input / output wirings and electrodes on the surface of the periphery of the glass substrate constituting the liquid crystal cell. . For this reason, although the number of parts and the number of connection points are small, since the electrical resistance of ITO is relatively large, the wiring becomes thick, the mounting area is enlarged, and the frame area becomes very large. Further, since the input / output wiring and the input bus wiring are subjected to the cross wiring processing on the same surface, there is a problem that the manufacturing cost becomes very high.

  Therefore, an object of the present invention is to reduce the number of parts, reduce the number of connections, simplify the process and reduce the man-hours, thereby reducing the manufacturing cost, improving the productivity, mounting area and frame. An object of the present invention is to provide a compact liquid crystal display device that can be reduced in area and accommodated for downsizing and thinning of electronic devices.

  Another object of the present invention is that when such a liquid crystal display device is mounted on an electronic device or the like, the assembly work can be simplified and the number of steps can be reduced with a relatively simple configuration, and the process can be automated. An object of the present invention is to provide a structure capable of mounting a liquid crystal display device in a compact manner while improving the performance and reducing the manufacturing cost.

  Furthermore, an object of the present invention is to increase the degree of freedom in product design, particularly in an electronic device equipped with a liquid crystal display device, and to expand the display screen and the amount of information displayed at the same time as making the device compact, thin, and compact. An object of the present invention is to provide a compact and easy-to-use high-functional electronic device that can be achieved and is portable.

  According to a first aspect of the present invention, there is provided a liquid crystal cell and a circuit board on which all or a part of a liquid crystal driving semiconductor chip and other electronic components necessary for driving and controlling the liquid crystal are mounted. A liquid crystal display device is provided in which an input terminal and an output terminal of the circuit board are directly connected.

  In this way, not only the liquid crystal driving semiconductor chip but also other electronic components necessary for the circuit for driving and controlling the liquid crystal are mounted on one circuit board in whole or in part as required, and By directly connecting the output side to the input side of the liquid crystal cell, it is possible to reduce the number of parts, thereby reducing the number of connections and reducing the number of assembly steps. Therefore, the manufacturing cost can be reduced and the productivity can be improved. In addition, since the area of the wiring pattern is significantly reduced together with the connection place, the area of the circuit board itself and the entire mounting area can be reduced. Furthermore, since the liquid crystal cell and the circuit board are arranged on substantially the same plane, the entire liquid crystal display device can be reduced in size and thickness to be compact.

  On the circuit board, not only chip capacitors and resistors as other electronic components but also electronic components such as a controller necessary for controlling the liquid crystal display can be mounted. In the case of a large liquid crystal cell, a plurality of sets of liquid crystal driving semiconductor chips and other electronic components can be mounted on one circuit board and directly connected to the liquid crystal cell. Further, as a means for directly connecting the output terminal of the circuit board and the input terminal of the liquid crystal cell, various conventionally known methods such as an anisotropic conductive film and an adhesive can be used.

  Circuit board materials include glass fiber, aramid fiber or a mixture of these and epoxy resin, polyimide resin or BT (bismaleide triazine) resin, epoxy resin, polyimide resin, BT resin It is convenient in handling to use a hard substrate material that is usually used, such as a single material or a mixture or compound material thereof. Further, since such a substrate material is less expensive than a TCP film material, the circuit board can be manufactured at a low cost, and the manufacturing cost of the liquid crystal display device can be reduced.

  According to a second aspect of the present invention, there is provided a liquid crystal cell, and a circuit board on which all or a part of a liquid crystal driving semiconductor chip and other electronic components necessary for driving and controlling the liquid crystal are mounted, and the liquid crystal cell. In order to mount the liquid crystal display device in which the input terminal of the circuit board and the output terminal of the circuit board are directly connected to the main body, the input terminal of the circuit board and the terminal of the main body are connected via a rubber connector made of conductive rubber. A mounting structure of a liquid crystal display device characterized by being connected is provided.

  According to the present invention, since the input terminals of the circuit board can be set to a relatively large pitch, for example, about 0.5 to 1 mm, terminals on the main body side that supply power and input signals using a connector made of conductive rubber. It is easy to connect with. Therefore, the liquid crystal display device can be easily mounted, and the assembly work can be automated by a robot or the like.

  At this time, if the input terminal of the circuit board is formed on the back side of the output terminal, the area of the circuit board can be further reduced, so that the liquid crystal display device can be downsized and the space required for mounting can be made compact.

  In addition, when the liquid crystal display device is fixed to the main body using the fixing means, the rubber connector is held in a compressed state between the circuit board and the main body, so that the liquid crystal display device can be easily assembled. And the continuity between the input terminal of the circuit board and the terminal on the main body side can be easily maintained. If such a fixing means is constituted by a case on the main body side, it is advantageous because the number of parts can be reduced.

  According to a third aspect of the present invention, there is provided a liquid crystal cell, and a circuit board on which all or a part of a liquid crystal driving semiconductor chip and other electronic components necessary for driving and controlling the liquid crystal are mounted, and the liquid crystal cell. There is provided an electronic apparatus comprising display means including a liquid crystal display device in which an input terminal of the circuit board and an output terminal of the circuit board are directly connected.

  According to the present invention, by mounting the liquid crystal display device that is reduced in size and thickness and reduced in manufacturing cost as described above, the degree of design freedom of the electronic device is increased, and the electronic device is compact and particularly suitable for carrying. Can be provided at low cost. In addition, since the size of the display screen can be made larger than the size of the device, a display that is easy to see and has a large amount of information can be obtained, and the functions and ease of use of the electronic device can be improved.

  The input terminal of the circuit board and the electronic device main body can be connected via a flexible cable. In this case, the liquid crystal display device can be mounted under optimum conditions by appropriately selecting the shape, dimensions, material, flexibility, etc. of the cable and appropriately setting the position where the cable is connected to the electronic device body. it can. Further, the input terminal of the circuit board and the terminal of the electronic device main body can be directly connected by soldering or via an anisotropic conductive film. Further, a connector can be provided on the electronic device main body, and the circuit board can be coupled to the connector directly or via the cable described above.

  According to another embodiment of the present invention, the input terminal of the circuit board and the terminal of the electronic device main body can be connected by the rubber connector made of conductive rubber. In this case, if the liquid crystal display device is fixed to the electronic device main body by the fixing means, and the rubber connector is held in a compressed state between the circuit board and the electronic device main body at that time, the assembly becomes easy. So it is convenient. Furthermore, if the fixing means is a case of an electronic device, the number of parts can be reduced, which is more convenient. Further, when the input terminal of the circuit board is formed on the back side of the output terminal, not only the area of the circuit board can be reduced, but also the liquid crystal display in the periphery of the liquid crystal cell to which the circuit board is connected. If the device is fixed so as to be pressed against the electronic device main body, the rubber connector can be reliably compressed and held at a desired position without using any special means or members.

[Example 1]
1 and 2 show a first embodiment of a liquid crystal display device according to the present invention. The liquid crystal display device 10 includes a liquid crystal cell 11 that sandwiches a liquid crystal layer between two glass substrates, a circuit board 12, and an input cable 13. The circuit board 12 is directly connected to one side of the liquid crystal cell 11. On the circuit board 12, in addition to the liquid crystal driving semiconductor chip 14, electronic components 15 such as a chip capacitor and a chip resistor constituting a liquid crystal driving circuit are mounted. The electronic component 15 is mounted by selecting all or a part necessary for the configuration of the drive circuit.

  As is well known, the semiconductor chip 14 can be connected to the circuit board 12 using an anisotropic conductive film. In this example, an anisotropic conductive film composed of conductive particles obtained by plating Ni—Au on polystyrene particles having a particle diameter of 5 μm and an adhesive mainly composed of an epoxy-based adhesive is used, and the temperature is 180 ° C. and the pressure is 10 gf / The thermocompression bonding was performed under the condition of bumps and pressing time of 30 seconds. As a matter of course, various methods known in the art such as a flip chip method in which face-down bonding is directly performed on a solder bump or the like, or a method in which a bump of a semiconductor chip is directly connected can be used to connect the semiconductor chip 14. In this embodiment, the electronic component 15 is connected to the circuit board 12 by soldering. In another embodiment, connection with a conductive adhesive such as silver paste or an anisotropic conductive film is also possible, which is effective when mounting electronic components such as minute chip capacitors.

  As well shown in FIG. 2, the output terminal 16 of the circuit board 12 is formed on the surface opposite to the semiconductor chip 14, and is connected to the output wiring 18 of the semiconductor chip through the through hole 17. An LCD terminal 20 made of, for example, an ITO transparent electrode connected to the electrode pattern is formed on the inner surface of the peripheral portion of the lower glass substrate 19 of the liquid crystal cell 11. By aligning the output terminal 16 with the corresponding LCD terminal 20 and sandwiching the ACF, that is, the anisotropic conductive film 21 between them, the circuit board 12 is thermocompression bonded by a predetermined pressurizing / heating tool. , Collectively and electrically connected. In this embodiment, the anisotropic conductive film 21 is composed of conductive particles obtained by plating Ni—Au on polystyrene particles having a particle diameter of 10 μm and an adhesive mainly composed of an epoxy-based adhesive at a temperature of 170. The connection was performed under the pressure bonding conditions of ° C., pressure 3 MPa, and pressurization time 20 seconds. In another embodiment, only the adhesive is used in place of the anisotropic conductive film, and the output terminal 16 of the circuit board 12 and the LCD terminal 20 can be brought into direct contact and conducted. In this connection method, the possibility of short-circuit failure due to conductive particles that occurs when an anisotropic conductive film is used is eliminated, and connection with a finer pitch becomes possible.

  The input terminal 22 of the circuit board 12 is connected using a wiring pattern 23 of the input cable 13 and an anisotropic conductive film 24. In this embodiment, the anisotropic conductive film 24 is composed of conductive particles made of nickel metal particles having a particle size of about 3 to 10 μm and an adhesive mainly composed of an epoxy adhesive, and has a temperature of 170. The connection was made under the conditions of ° C., pressure 3 MPa, and pressurization time 20 seconds. By using an anisotropic conductive film in this way, it is possible to cope with a fine connection pitch, and higher-density mounting is possible. Further, the circuit board 12 and the input cable 13 can be connected by manual work or machine by soldering, which is conventionally performed. Furthermore, the connecting portion between the circuit board 12 and the input cable 13 can be coated with a molding material such as silicon resin, acrylic resin, or urethane resin to prevent moisture, dust, and damage due to mechanical contact. . Such a molding material can be similarly used for the connection part between the circuit board 12 and the liquid crystal cell 11 described above, the connection part of the semiconductor chip 14 and the electronic component 15 to the circuit board 12, and the like.

  In this embodiment, as a circuit board 12, a glass epoxy base material having a thickness of 0.1 mm is coated on both sides with a 9 μm-thick copper foil, a wiring pattern is formed by etching, and both sides are electrically connected through a through hole. I am using something that I like to take. It is convenient to apply Ni—Au plating to the surface of the wiring pattern so as not to cause problems such as migration. As the glass epoxy substrate, one having a thickness of about 0.05 mm to 0.8 mm can be used. Further, as the base material of the circuit board 12, a composite material of an aramid fiber or a mixed material thereof in addition to glass fiber and an epoxy resin and a polyimide resin or a BT (bismaleide triazine) resin is used. A single material or a composite material such as an epoxy resin, a polyimide resin, or a BT resin can be used. Furthermore, instead of the double-sided wiring board as in the present embodiment, a single-sided wiring board or a multilayer board such as three layers or four layers can be similarly used for the circuit board 12. When the single-sided wiring board is used, the output terminal is formed on the same surface as the mounting surface of the liquid crystal driving semiconductor chip, but the cost of the substrate can be reduced. When a multilayer substrate is used, noise countermeasures such as providing a ground layer or thickening a power supply wiring pattern can be made relatively easy.

  As described above, according to the present invention, in addition to a liquid crystal driving semiconductor chip, all or a part of electronic components such as a chip capacitor and a chip resistor necessary for a liquid crystal driving circuit are mounted on one circuit board. Since the area for mounting these electronic components can be minimized and the area of the wiring pattern can be minimized, the mounting area can be reduced as a whole. Further, since the circuit board is connected to the peripheral portion of the liquid crystal panel and on the same surface, the frame area can be reduced, and the entire liquid crystal display device can be reduced in size and thickness to be compact. In addition, since the circuit board is connected directly to the input side of the liquid crystal cell and power and input signals are supplied from the input cable, the number of parts is reduced, the number of connections is reduced, and the number of assembly steps is reduced. Thus, the manufacturing cost can be reduced and the productivity can be improved.

[Example 2]
3 and 4 show a second embodiment of the liquid crystal display device according to the present invention. This embodiment differs from the first embodiment described above in that a controller 25 for controlling liquid crystal display is additionally mounted on the circuit board 12. The controller 25 is connected using an anisotropic conductive film in the same manner as described above for the liquid crystal driving semiconductor chip 14, but it can be connected by other conventional methods using solder or adhesive. Not too long. In addition to the controller 25, all or a part of other electronic components constituting a control circuit for controlling the liquid crystal display can be mounted on the circuit board 12.

  According to this embodiment, the semiconductor chip and other electronic components are mounted by mounting not only the electronic components for driving the liquid crystal but also the electronic components for controlling the liquid crystal display on one circuit board. Therefore, the area of the wiring pattern and the area of the wiring pattern necessary for forming the drive / control circuit can be minimized. Thereby, the area of the circuit board can be reduced, and the entire liquid crystal display device can be configured more compactly. Further, since the number of parts can be reduced and the board area can be further reduced, the cost can be further reduced.

Example 3
FIG. 5 shows a third embodiment of the liquid crystal display device according to the present invention. In this embodiment, the input cable in the first embodiment is omitted, and the input terminals 22 are linearly arranged at a constant pitch on the back surface of the circuit board 12 on which the liquid crystal driving semiconductor chip 14 and other electronic components 15 are mounted. Is formed. For example, the input terminal 22 is formed in a shape suitable for direct connection with a terminal for inputting power and signals from an electronic device main body on which a liquid crystal display device is mounted, by soldering, an anisotropic conductive film, an adhesive, or the like. ing. The input terminal 22 is connected to the input side of the semiconductor chip 14 through a through hole provided in the circuit board 12. Of course, the input terminal 22 can be provided on the same surface of the circuit board 12 as the semiconductor chip.

  According to the present embodiment, since the input cable is omitted, the number of parts is further reduced, and the cost can be further reduced. Furthermore, since the connection area with the electronic device on which the liquid crystal display device of this embodiment is mounted can be made smaller, not only the liquid crystal display device but also the electronic device main body can be made more compact.

Example 4
FIG. 6 shows a fourth embodiment of the liquid crystal display device according to the present invention. In the circuit board 12 of this embodiment, an input terminal 22 is formed at an edge portion along one side opposite to the liquid crystal cell 11. The input terminal 22 has a through hole cut in half by forming a large number of semicircular cutouts 26 at regular intervals in the edge portion of the circuit board 12 and attaching a conductive material to the inside of the cutouts. It is formed in such a shape. With this configuration, when the input terminal 22 is soldered, the billet is well formed, so that soldering is facilitated and high reliability can be obtained at the connection portion.

  In another embodiment, the input terminal 22 can be formed by omitting the notch 26 and simply attaching a conductive material to the edge portion of the circuit board 12. Further, the input terminal 22 can be extended to the back surface of the circuit board 12.

Example 5
7 and 8 show a fifth embodiment of the liquid crystal display device according to the present invention. The circuit board 12 of the present embodiment is provided with a connecting portion 27 with a central portion on the opposite side to the liquid crystal cell 11 protruding. The connection portion 27 is formed in a long and narrow rectangle matching the size so that it can be directly inserted into a female connector provided in the electronic device body, and the input terminals 22 are formed on the upper surface thereof at a constant pitch. The input terminals 22 may be formed on both surfaces of the connection portion 27 depending on the number of the input terminals 22 or the dimensions of the connector and the circuit board. Further, depending on the size and type of the connector, one side of the circuit board 12 provided with the input terminals 22 can be directly inserted into the connector as a connection portion.

  According to the present embodiment, since the connection portion 27 of the circuit board 12 integrally coupled with the liquid crystal cell 11 can be electrically connected only by being inserted into the connector, the mounting of the liquid crystal display device and the assembly of the electronic device are easy. become. In addition, since it becomes easy to remove the liquid crystal display after mounting, it can be easily replaced by anyone without the need for special tools or technology, especially in electronic devices that require regular maintenance. It is convenient because the work becomes easy.

[Other Examples]
9 and 10 show a modification of the fifth embodiment described above. In this embodiment, the circuit board 12 is connected to the inner surface of the peripheral part of the upper glass substrate of the liquid crystal cell 11. The circuit board 12 is provided with a connection portion 27 as in the circuit board of FIG. 7, and the output terminal 16 and the input terminal 22 are formed on the mounting surface of the liquid crystal driving semiconductor chip 14. According to the present embodiment, by providing the output terminal 16 on the mounting surface of the semiconductor chip 14, it is not necessary to provide a through hole on the output side where a fine terminal pitch is required, and the circuit board 12 can be more easily and easily formed. It can be manufactured at low cost.

  FIG. 11 and FIG. 12 show a preferred configuration for mounting the liquid crystal display device of the present invention as a display means in an electronic device or the like. In the liquid crystal display device 10 of the present embodiment, the light guide 30a of the backlight means 30 is disposed between the main body substrate 29 on which the liquid crystal display device 10 is mounted, and a rectangular frame-shaped fixing member 31 is mounted thereon. ing. An LED 30b as a light source of the backlight means 30 is disposed on the main body substrate 29 immediately beside the light guide. The fixing member 31 is opened so that one side portion thereof can partially extend the circuit board 12 of the liquid crystal display device 10 outward, and two legs 32 are provided on the remaining three side portions, respectively. Is projecting downward. The fixing member 31 inserts each leg 32 into six holes 33 drilled in the main body substrate, and bends the tip of the leg 32 so that the liquid crystal display device 10 and the light guide 30a are attached to the main body substrate 28. Fix it to press. In the present embodiment, the light guide body and the LED of the backlight unit 30 are separately fixed. However, in another embodiment, a backlight unit in which the light guide body and the LED are integrated into a unit is used. It can be mounted in the same manner as the light guide in the example.

  On the upper surface of the fixing member 31, a reinforcing rib 34 for preventing the deformation is formed, and between the fixing member 31 and the liquid crystal cell 11 and between the liquid crystal cell and the light guide 30a at the position of the rib. Between the light guide 30a and the main body substrate 29, cushion materials 35 to 37 made of an adhesive material such as rubber, a plastic sheet, and a double-sided tape are respectively interposed. A large rectangular window 38 is opened on the upper surface of the fixing member 31 so that the display screen 39 of the liquid crystal display device 10 can be seen.

  In the liquid crystal display device 10, the circuit board 12 is connected to the inner surface of the upper glass substrate 40 of the liquid crystal cell 11 as in the embodiment shown in FIGS. 9 and 10. The circuit board 12 has a liquid crystal driving semiconductor chip 14 mounted on an upper surface thereof, and an output terminal is formed. On the lower surface of the circuit board 12, an electronic component 15 such as a chip capacitor necessary for a liquid crystal driving circuit is mounted and an input terminal 22 is formed. On the other hand, a terminal 41 for supplying power and input signals to the liquid crystal display device 10 is provided on the upper surface of the main body substrate 29. Between the main board 29 and the circuit board 12, for example, a rubber connector 42 made of a known conductive rubber in which conductive portions and insulating portions are alternately provided is sandwiched, whereby the input terminal 22 and the output terminal 41 are sandwiched. And are electrically connected. Since the input terminals 22 of the circuit board 12 can have a relatively large pitch of about 0.5 to 1 mm, they can be sufficiently connected by rubber connectors.

  According to the present invention, the circuit board 12 and the rubber connector 42 are aligned, and the liquid crystal display device is assembled so as to be sandwiched between the main body board using the fixing member. Therefore, the rubber connector 42 is held in a compressed state between the circuit board 12 and the main body board 29. Since the assembly of the liquid crystal display device is simplified in this way, the mounting process of the liquid crystal display device can be automated by a robot or the like in the electronic equipment production line, which improves productivity and reduces manufacturing costs. Can be planned.

  FIG. 13 shows a modification of the mounting structure of the liquid crystal display device shown in FIGS. 11 and 12 described above. In this modified embodiment, the fixing member 31 is made of, for example, a plastic molded product, and an elastically deformable hook 43 is integrally formed at the tip of the leg 32. The fixing member 31 is fixed in a one-touch manner by inserting each leg 32 into the hole 33 of the main board 29 and engaging each hook 43 with the back surface of the main board. Thereby, the assembly of the liquid crystal display device can be further simplified.

  11 to 13, the rectangular frame-shaped fixing member 31 is used to fix the liquid crystal display device to the main body substrate. However, according to the present invention, the rubber connector 42 is connected to the circuit board 12 and the main body. Any other fixing means having various structures and shapes can be used as long as it can be compressed and held with the substrate 29. In another embodiment, when the liquid crystal display device is driven by a plurality of semiconductor chips, a plurality of circuit boards each mounting one semiconductor chip are directly connected to the liquid crystal cell, and the input terminals of each circuit board Can be connected via a rubber connector. Also, a plurality of liquid crystal driving semiconductor chips are mounted on one circuit board and directly connected to the liquid crystal cell, and the input terminals of the circuit board are connected to the main body side via rubber connectors for each semiconductor chip. It can also be connected.

  The liquid crystal display device according to the present invention can be mounted and used in various electronic devices, and is particularly advantageous in the case of electronic devices that require portability. As an example of such an electronic apparatus, FIG. 14 shows a mobile phone 44 equipped with the liquid crystal display device 10 according to the present invention. In the embodiment shown in FIG. 15, the liquid crystal display device 10 of the first embodiment shown in FIGS. 1 and 2 is mounted on the main body substrate 45 of the mobile phone 44. The liquid crystal cell 11 is fixed to a predetermined position on the main body substrate 46 by using an adhesive for the cushioning fixing member 47 made of, for example, silicon rubber or foamed urethane, or by a double-sided tape made of nonwoven fabric. ing. On the main body substrate 46, a terminal 48 for supplying power and input signals to the liquid crystal display device 10 is formed, and a female connector 49 connected to the terminal is provided. The liquid crystal display device 10 is connected to the power source side of the main body substrate 46 by inserting the input cable 13 into the connector 49 so as to be removable.

  In this embodiment, since the liquid crystal display device 10 is connected to the main board 46 via the input cable 13 as described above, the degree of freedom in designing electronic equipment is increased, and the shape, dimensions, and material of the cable are increased. In addition, the liquid crystal display device can be mounted on an electronic device under optimum conditions by appropriately selecting flexibility and setting the connector arrangement appropriately. Moreover, according to the present invention, since the liquid crystal display device is reduced in size and thickness and the frame portion is small, not only can the electronic device on which the liquid crystal display device is mounted be reduced in size and size, but also the display screen can be enlarged. Therefore, it is possible to obtain a mobile phone that is compact and excellent in portability, and that is easy to use, that is easy to see and has a large amount of display information.

  In the embodiment of FIG. 16, the liquid crystal display device 10 of the third embodiment shown in FIG. The input terminal 22 of the circuit board 12 is directly connected to the input terminal 48 of the main body board 46 through the anisotropic conductive film 50. In this example, as the anisotropic conductive film, a conductive particle composed of nickel metal particles having a particle size of about 3 to 10 μm and a thermosetting adhesive mainly composed of an epoxy adhesive are used. The pressure bonding was performed under the conditions of a temperature of 170 ° C., a pressure of 3 MPa, and a pressing time of 20 seconds. Of course, other anisotropic conductive films can be used and pressure-bonded under different conditions, or other conventionally known connection methods can be used.

  In this embodiment, since the circuit board and the main body board are electrically connected using an anisotropic conductive film, it is possible to sufficiently cope with the finer terminal pitch. Further, the influence of heat or the like on the main body substrate or the liquid crystal display device when both are thermocompression bonded can be reduced. Also in this embodiment, it goes without saying that the cellular phone is made compact and the display screen is enlarged, and the ease of use is greatly improved.

  In the embodiment of FIG. 17, the liquid crystal display device 10 of the fourth embodiment shown in FIG. As described above, the circuit board 12 has the input terminal 22 formed on one side edge portion thereof, and can be directly connected to the output terminal 48 of the main board 46 by soldering. According to the present embodiment, since the solder connection portion 51 is relatively small, the area and thickness required for the connection between the circuit board 12 and the main board 46 can be reduced, and the mobile phone can be made smaller and thinner. Can be compact.

  In the embodiment of FIG. 18, the liquid crystal display device 10 of the fifth embodiment shown in FIGS. The main body board 46 is provided with a female connector 49 connected to the output terminal 48 as in the embodiment of FIG. The circuit board 12 is connected to the output terminal 48 of the main board 46 by inserting the connecting portion 27 into the connector 49 so that the circuit board 12 can be inserted and removed. Therefore, according to this embodiment, the liquid crystal display device can be easily attached to and detached from the mobile phone. For this reason, even when periodic replacement is required for maintenance, anybody can easily perform work without requiring special techniques or jigs.

  FIG. 19 shows a mobile phone 44 to which the mounting structure of the liquid crystal display device shown in FIG. 13 is applied. In the present embodiment, the upper case 52 corresponds to the fixing member 31 in FIG. 13, and the window 53 corresponding to the window 37 is opened according to the position of the liquid crystal display device 10, and the legs 32 and hooks in FIG. 13. A large number of claws 54 and 55 corresponding to 43 are projected from the inner periphery of the upper case 52 and in the vicinity of the window 53. Further, a substrate 56 corresponding to the main body substrate 46 of FIG. 13 is formed in a shape and size substantially corresponding to the internal shape of the upper case 52.

  In the present embodiment, the liquid crystal display device 10 is disposed at a predetermined position in the upper case 52, and the light guide 30a (or the backlight means integrated with the LED) and the rubber connector 42 are aligned thereon. After the placement, the substrate 56 is fitted from above so as to press them against the upper case. A cutout 57 and a hole 58 are formed in the substrate 56 at positions corresponding to the claws 54 and 55 of the upper case 52. Therefore, the substrate 56 is fixed in a one-touch manner by engaging the claws 54 and 55 of the upper case 52 corresponding to the notches 57 and the holes 58 while aligning the terminals with the rubber connector 42. The rubber connector 42 is held in a compressed state between the circuit board 12 and the board 56.

  As described above, according to the present embodiment, the number of components can be reduced, the number of connection points and the number of assembling steps can be reduced, the assembling work of the mobile phone can be simplified, and the manufacturing cost can be reduced. In addition, as in the above-described embodiments, the mobile phone itself can be reduced in size, thickness, and size, and the ease of use and functions can be improved by increasing the amount of display information by expanding the display screen. it can.

1 is a perspective view showing a first embodiment of a liquid crystal display device according to the present invention. 1 is a cross-sectional view of a main part of a first embodiment of a liquid crystal display device according to the present invention. The perspective view which shows 2nd Example of the liquid crystal display device by this invention. Sectional drawing of the principal part of 2nd Example of the liquid crystal display device by this invention. The perspective view which shows the 3rd and 4th Example of the liquid crystal display device by this invention, respectively. The perspective view which shows the 3rd and 4th Example of the liquid crystal display device by this invention, respectively. The perspective view which shows 5th Example of the liquid crystal display device by this invention. Sectional drawing of the principal part of 5th Example of the liquid crystal display device by this invention. The perspective view which shows 6th Example of the liquid crystal display device by this invention. Sectional drawing of the principal part of 6th Example of the liquid crystal display device by this invention. The perspective view which shows the mounting structure of the liquid crystal display device by this invention. Sectional drawing of the mounting structure of the liquid crystal display device by this invention. Sectional drawing which shows the modification Example of the mounting structure of a liquid crystal display device. 1 is a schematic perspective view showing a mobile phone to which the present invention is applied. Sectional drawing which shows the principal part of the mobile telephone which mounted the liquid crystal display device of 1st Example. Sectional drawing which each shows the principal part of the mobile telephone which mounted the liquid crystal display device of the 3rd-5th Example. Sectional drawing which each shows the principal part of the mobile telephone which mounted the liquid crystal display device of the 3rd-5th Example. Sectional drawing which each shows the principal part of the mobile telephone which mounted the liquid crystal display device of the 3rd-5th Example. FIG. 14 is an exploded perspective view showing a mobile phone to which the mounting structure of FIG. 13 is applied. The perspective view which shows the liquid crystal display device by a prior art

Claims (8)

A liquid crystal cell having a plurality of input terminals sandwiched between two substrates and disposed at a predetermined pitch along one side of one of the substrates;
The semiconductor chip for driving the liquid crystal and the first electronic component constituting the driving circuit for the liquid crystal are mounted, and a plurality of output terminals arranged at a predetermined pitch along one side in the longitudinal direction, and A circuit board having a plurality of input terminals arranged at a predetermined pitch along the opposite side,
The circuit board is electrically connected to the liquid crystal cell and mechanically by directly connecting the output terminal to the input terminal of the one substrate of the liquid crystal cell in the same plane as the liquid crystal cell. Fixedly supported by
The liquid crystal, wherein the semiconductor chip is disposed in the center along the longitudinal direction on the circuit board, and the first electronic component is disposed on both sides of the semiconductor chip along the longitudinal direction. Display device. In addition to the first electronic component, a second electronic component constituting a control circuit for controlling a liquid crystal display is mounted on the circuit board,
The semiconductor chip is disposed in the center along the longitudinal direction on the circuit board, and the first and second electronic components are disposed on both sides of the semiconductor chip along the longitudinal direction. The liquid crystal display device according to claim 1. A liquid crystal cell and a circuit board on which all or a part of a liquid crystal driving semiconductor chip and other electronic components necessary for driving and controlling the liquid crystal are mounted, and an input terminal of the liquid crystal cell and an output terminal of the circuit board A directly connected liquid crystal display device,
The circuit board has an input terminal formed at an edge portion along one side opposite to the liquid crystal cell, and the input terminal has a plurality of semicircular notches formed at regular intervals in the edge portion. A liquid crystal display device comprising: A liquid crystal cell and a circuit board on which all or a part of a liquid crystal driving semiconductor chip and other electronic components necessary for driving and controlling the liquid crystal are mounted, and an input terminal of the liquid crystal cell and an output terminal of the circuit board A directly connected liquid crystal display device,
The liquid crystal display device according to claim 1, wherein the circuit board is provided with a connection portion by projecting a central portion opposite to the liquid crystal cell. A liquid crystal display device according to claim 1 or 2, and a main body substrate for supplying a power source and an input signal to the liquid crystal display device,
An electronic apparatus comprising: a flexible cable that electrically connects the input terminal of the circuit board and the main board. A liquid crystal display device according to claim 1 or 2, and a main body substrate for supplying a power source and an input signal to the liquid crystal display device,
The electronic device, wherein the input terminal of the circuit board is directly connected to the main body board through an anisotropic conductive film. A liquid crystal display device according to claim 3, and a main body substrate for supplying a power source and an input signal to the liquid crystal display device,
An electronic apparatus, wherein the input terminal of the circuit board and the main body board are connected by soldering. A liquid crystal display device according to claim 4, and a main body substrate for supplying power and input signals to the liquid crystal display device,
The electronic device according to claim 1, wherein the main body substrate is provided with a connector into which the connection portion of the circuit board can be inserted and removed.

Images