JP2011174959A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily connect an electrode of an image display device with a circuit board with a driving circuit mounted thereon even if the image display device is a high-definition image display device. <P>SOLUTION: A flexible substrate 10 is composed of a first substrate part 16 and a second substrate part 18. The first substrate part 16 includes: a panel side connection part 11 to be connected to an image display device; a first circuit side connection part 12 to be connected to a driving circuit; and a first bonding part 17 between the panel side connection part 11 and the first circuit side connection part 12. The second substrate part 18 includes: a second circuit side connection part 13 to be connected to the driving circuit; and a second bonding part 19 to be bonded to the first bonding part 17. The flexible substrate 10 is formed by bonding the first bonding part 17 and the second bonding part 19 together. A circuit board 90 is equipped with: on one face, a connector 92 to connect to the first circuit side connection part 12 of the flexible substrate 10 and; and on the other side, a connector 93 to connect to the second circuit side connection part 13 of the flexible substrate 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image display apparatus using a flat-type image display device.

  In general, a flat panel image display device such as a plasma display panel or a liquid crystal panel has a large number of electrodes arranged in a matrix in the row direction and the column direction. In an image display apparatus using these image display devices, a drive voltage waveform is supplied to each electrode of the image display device via a flexible substrate (Flexible Printed Circuits).

  For example, in the case of a plasma display panel, the electrode terminal of the data electrode is on the long side of the panel, the electrode terminal of the scanning electrode is on one of the short sides of the panel, and the sustain electrode is on the other side of the short side of the panel Electrode terminals are provided. A flexible substrate is attached to each electrode terminal (see, for example, Patent Document 1). Here, the number of electrode terminals of the scanning electrode is equal to the number of pixels in the column direction.

JP 2004-086134 A

  As the definition of a flat panel image display device increases and the number of pixels increases, the electrodes arranged in a matrix are also miniaturized, and the electrode terminals to which the flexible substrate is connected are also miniaturized. However, the wiring interval of the circuit board on which the drive circuit that generates the drive voltage waveform applied to each electrode is mounted, the distance between the connection terminals of the circuit side connection portion of the flexible substrate, and the distance between the terminals of the connector that connects them are safety standards. Since it must be satisfied, it cannot be refined indefinitely.

  As a result, the electrodes of the image display device and the circuit board on which the drive circuit is mounted cannot be easily connected, making it difficult to arrange the connectors and wiring on the circuit board, or the circuit board itself. Has occurred. In particular, if the panel electrode spacing is narrower than the permissible inter-terminal distance of the connector, the connectors for connecting the flexible substrate cannot be arranged in a row on the circuit board. If the connectors are distributed on the circuit board, the flexible boards cross on the circuit board to increase the assembly man-hours of the image display device, or the impedances associated with each of the flexible boards and the difference between them increases. As a result, there has been a problem that image display quality is deteriorated due to distortion superimposed on the drive voltage waveform.

  The present invention has been made in view of the above problems, and an image display device that can easily connect an electrode of an image display device and a circuit board on which a drive circuit is mounted even in a high-definition image display device. The purpose is to provide.

  In order to achieve the above object, the present invention provides an image display device comprising an image display device, a flexible substrate connected to an electrode of the image display device, and a circuit board provided with a connector for connecting the flexible substrate. The flexible substrate has a panel side connection portion having a plurality of connection terminals for connection to the image display device and a first circuit side connection portion having a plurality of connection terminals for connection to the drive circuit and the panel side. A first substrate portion having a first bonding portion between the connection portion and the first circuit side connection portion; a second circuit side connection portion having a plurality of connection terminals for connecting to the driving circuit; A second substrate portion having a second bonding portion for bonding to the one bonding portion, the first bonding portion and the second bonding portion being bonded together, Is provided with a connector for connecting a first circuit-side connection portion of the flexible substrate on one surface, characterized in that a connector for connecting the second circuit-side connection portion of the flexible substrate to the other surface. With this configuration, it is possible to provide an image display apparatus that can easily connect an electrode of an image display device and a circuit board on which a drive circuit is mounted even in a high-definition image display device.

  The image display device of the image display apparatus of the present invention may be a plasma display panel.

  According to the present invention, it is possible to provide an image display device that can easily connect an electrode of an image display device and a circuit board on which a drive circuit is mounted even in a high-definition image display device. Become.

It is a top view which shows the flexible substrate in Embodiment 1 of this invention. It is a disassembled perspective view which shows the flexible substrate in Embodiment 1 of this invention. It is a perspective view which shows a mode that the flexible substrate in Embodiment 1 of this invention is connected to the connector of a circuit board. It is a disassembled perspective view of the panel used for the plasma display apparatus in Embodiment 2 of this invention. It is a schematic diagram which shows arrangement | positioning of the display electrode pair 34 and corresponding electrode terminal of the front substrate of the panel in Embodiment 2 of this invention. It is a figure which shows the drive voltage waveform applied to each electrode of the panel used for the plasma display apparatus in Embodiment 2 of this invention. It is a circuit block diagram of the plasma display apparatus in Embodiment 2 of the present invention. It is a figure which shows the drive circuit mounted in the circuit board of the plasma display apparatus in Embodiment 2 of this invention. It is a disassembled perspective view which shows the structure of the plasma display apparatus in Embodiment 2 of this invention. It is an enlarged view which shows the mode of the connection of the electrode terminal for scan electrodes of the plasma display apparatus in Embodiment 2 of this invention, and a connector. It is a perspective view which shows the flexible substrate in Embodiment 3 of this invention.

  Hereinafter, a flexible substrate used in an image display device according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
1A and 1B are diagrams showing a flexible substrate 10 according to Embodiment 1 of the present invention. FIG. 1A shows a plan view and FIG. 1B shows an exploded perspective view. The flexible substrate 10 is a flexible substrate that connects the image display device and the drive circuit, and is configured by bonding the first substrate portion 16 and the second substrate portion 18 together.

  The first substrate unit 16 includes a panel side connection unit 11, a first circuit side connection unit 12, and a first bonding unit 17. The panel side connection part 11 has a plurality of connection terminals 21 for connection to electrode terminals (not shown) of a panel which is an image display device. The first circuit side connection portion 12 (hereinafter simply referred to as “circuit side connection portion 12”) has a plurality of connections for connecting to the drive circuit via a connector (not shown) provided on the circuit board. A terminal 22 is provided. The first bonding portion 17 (hereinafter simply referred to as “bonding portion 17”) is provided between the panel side connection portion 11 and the first circuit side connection portion 12, and the second substrate portion 18 and A plurality of bonding terminals 27 for bonding are provided. In FIG. 1B, the connection terminal 21, the connection terminal 22, and the bonding terminal 27 are provided on the back surface side of the first substrate portion 16, and thus are indicated by dotted lines.

  In addition, the first substrate unit 16 includes a wiring 25 a that electrically connects the connection terminal 21 and the connection terminal 22, and a wiring 25 b that electrically connects the connection terminal 21 and the bonding terminal 27. These wirings 25a and 25b are formed on a flexible base material such as polyimide, and are flexible films except for the connection terminal 21, the connection terminal 22, and the bonded terminal 27. Covered.

  The second substrate unit 18 includes a second circuit side connection unit 13 and a second bonding unit 19. The second circuit side connection portion 13 (hereinafter simply referred to as “circuit side connection portion 13”) has a plurality of connections for connecting to the drive circuit via a connector (not shown) provided on the circuit board. A terminal 23 is provided. The second bonding section 19 (hereinafter simply referred to as “bonding section 19”) has a plurality of bonding terminals 29 for connection to the bonding section 17 of the first substrate section 16. In FIG. 1B, since the connection terminal 23 and the bonding terminal 29 are provided on the surface side of the second substrate portion 18, they are indicated by solid lines. Here, the connection terminal 23 and the bonding terminal 29 are connected by the wiring 26. These wirings 26 are also formed on a flexible base material such as polyimide, and are covered with a flexible film except for the connection terminals 23 and the bonded terminals 29.

  And the bonding part 17 and the bonding part 19 are bonded together so that the 1st board | substrate part 16 and the 2nd board | substrate part 18 may overlap, and the flexible substrate 10 is formed. Thereby, the connection terminal 21 of the panel side connection part 11 of the flexible substrate 10 and the connection terminal 22 of the circuit side connection part 12 are electrically connected via the wiring 25a, and the connection terminal 21 of the panel side connection part 11 and the circuit are electrically connected. The side connection part 13 is electrically connected to the connection terminal 23 via a wiring 25 b, a bonding part 17, a bonding part 19, and a wiring 26.

  Here, the interval (pitch) between the connection terminals 21 provided in the panel-side connection portion 11 is the same as the pitch of the electrode terminals of the panel to be connected, and is usually the same as or slightly narrower than the electrode pitch of the panel. The pitch. Further, the interval (pitch) between the connection terminal 22 provided in the circuit side connection portion 12 and the connection terminal 23 provided in the circuit side connection portion 13 is set according to the specification of the connector to be used. The connectors that can be used are limited by the voltage and current of the drive voltage waveform applied to the panel.

  In the high-definition panel, although the electrode pitch of the panel becomes very narrow, the distance between the terminals of the connector is limited by safety standards and the like, so the connection terminal 22 provided in the circuit-side connection portion 12 and the circuit-side connection The pitch of the connection terminals 23 provided in the part 13 is wider than the pitch of the connection terminals 21 provided in the panel side connection part 11.

  In the flexible substrate 10 in the present embodiment, for example, the number of connection terminals 21 of the panel side connection portion 11 is 270, and the pitch is 0.26 mm. The number of connection terminals 22 of the circuit side connection part 12 and the number of connection terminals 23 of the circuit side connection part 13 are 135, and the pitch is 0.42 mm. Thus, the pitch of the connection terminal 22 and the connection terminal 23 is wider than the pitch of the connection terminal 21.

  FIG. 2 is a perspective view showing a state where the flexible substrate 10 according to Embodiment 1 of the present invention is connected to the connector 92 and the connector 93 of the circuit board 90.

  As described above, the circuit side connection portion 12 provided on the first substrate portion 16 of the flexible substrate 10 is connected to the connector 92 provided on one surface side of the circuit substrate 90. Further, the circuit side connection portion 13 provided on the second substrate portion 18 is connected to a connector 93 provided on the other surface side of the circuit substrate 90.

  The flexible substrate according to the present embodiment includes a first substrate portion 16 having a first circuit side connection portion 12 and a first bonding portion 17 at a position spaced from the panel side connection portion 11, and a second circuit. The second substrate portion 18 having the side connection portion 13 and the second bonding portion 19 is connected to the first bonding portion 17 and the second substrate portion 16 so that the first substrate portion 16 and the second substrate portion 18 overlap each other. Are bonded together.

  Further, as described above, the pitch of the connection terminal 22 provided in the circuit side connection portion 12 of the flexible substrate 10 and the connection terminal 23 provided in the circuit side connection portion 13 in the present embodiment is set to the panel side connection portion 11. The pitch is wider than the pitch of the connecting terminals 21 provided. However, by connecting the flexible substrate 10 to the connector 92 and the connector 93 provided on the front surface side and the back surface side of the circuit substrate 90 in this way, the width occupied by the flexible substrate 10 when the flexible substrate 10 is mounted is increased. This is approximately the same as the width of the panel-side connecting portion 11. For this reason, even when a plurality of flexible boards 10 are arranged and connected to the electrode terminals of the panel, the connectors can be arranged in a line on the front and back surfaces of the circuit board, thereby realizing a compact image display device. be able to.

  In the present embodiment, the number of connection terminals 21 of the panel side connection portion 11 is 270, and the number of connection terminals 22 of the circuit side connection portion 12 and the number of connection terminals 23 of the circuit side connection portion 13 are both 135. It was assumed to be an individual. In this case, the number of connection terminals 22 and the number of connection terminals 23 are equal, and the sum of the number of connection terminals 22 and the number of connection terminals 23 is equal to the number of connection terminals 21. However, the present invention is not limited to these numerical values and these relationships. The number of connection terminals 22 and connection terminals 23 may not be equal, and the sum of the number of connection terminals 22 and the number of connection terminals 23 may not be equal to the number of connection terminals 21. For example, when the circuit side connection portion 12 and the circuit side connection portion 13 include dummy connection terminals, the sum of the number of connection terminals 22 and the number of connection terminals 23 is larger than the number of connection terminals 21. . As another example, a plurality of integrated circuits for generating drive voltage waveforms to be applied to the electrodes of the image display device are mounted. For example, 90 drive voltage waveforms are output from one integrated circuit. And At this time, the number of connection terminals 22 of the circuit side connection unit 12 may be 180 for two integrated circuits, and the number of connection terminals 23 of the circuit side connection unit 13 may be 90 for one integrated circuit. Thus, the number of connection terminals 22 and connection terminals 23 may be different. In the above description, the number of each connection terminal is an integral multiple of the number of outputs of the integrated circuit, but may be set regardless of the number of outputs of the integrated circuit.

  Next, an image display device using a flexible substrate according to an embodiment of the present invention will be described with reference to the drawings, taking a plasma display device as an example.

(Embodiment 2)
FIG. 3 is an exploded perspective view of panel 30 used in the plasma display device in accordance with the second exemplary embodiment of the present invention. A plurality of display electrode pairs 34 each including a scanning electrode 32 and a sustain electrode 33 are formed on a glass front substrate 31. A dielectric layer 35 is formed so as to cover the scan electrode 32 and the sustain electrode 33, and a protective layer 36 is formed on the dielectric layer 35. A plurality of data electrodes 42 are formed on the back substrate 41, a dielectric layer 43 is formed so as to cover the data electrodes 42, and a grid-like partition wall 44 is formed thereon. A phosphor layer 45 is provided on the side surface of the partition wall 44 and on the dielectric layer 43.

  The front substrate 31 and the rear substrate 41 are arranged to face each other so that the display electrode pair 34 and the data electrode 42 cross each other with a minute discharge space interposed therebetween, and the outer peripheral portion thereof is sealed with a sealing material such as glass frit. It is worn. In the discharge space, for example, a mixed gas of neon and xenon is enclosed as a discharge gas. The discharge space is partitioned into a plurality of sections by partition walls 44, and discharge cells are formed at the intersections between the display electrode pairs 34 and the data electrodes 42. These discharge cells discharge and emit light to display an image.

  In the panel 30 in which n scanning electrodes 32 and n sustain electrodes 33 that are long in the row direction are arranged on the front substrate 31 and m data electrodes 42 that are long in the column direction are arranged on the back substrate 41, M × n discharge cells are formed in the space. The area where the m × n discharge cells are formed is an image display area, and an image is displayed in the image display area on the front substrate 31 side.

  The number of scan electrodes 32 and sustain electrodes 33 of the ultra-high definition panel is, for example, n = 2160. Each of these electrodes is connected to each of electrode terminals provided on the periphery of the panel 30 outside the image display area of the front substrate 31 and the rear substrate 41.

  FIG. 4 is a schematic diagram showing the arrangement of display electrode pairs 34 and corresponding electrode terminals on front substrate 31 of panel 30 according to Embodiment 2 of the present invention, where display electrode pairs 34 and corresponding electrode terminals are formed. It is the figure seen from the surface. It is necessary to apply different driving voltages to the scanning electrodes 32. For this purpose, each of the scanning electrodes 32 is provided by a lead line 51 at the right peripheral portion outside the image display area when viewed from the display surface side (therefore, the left peripheral portion in FIG. 4). 52 is connected to each of them. In order to connect the flexible substrate 10, a plurality of scanning electrode electrode terminals 52 are grouped and arranged as an electrode terminal group 53. FIG. 4 shows 48 scan electrodes 32 and 48 scan electrode electrode terminals 52 grouped into 6 electrode terminal groups 53 of 8 each, but these numbers make it easy to see the figure. Is for. In the present embodiment, for example, the number of scanning electrodes 32 is 2,160, and the number of scanning electrode electrode terminals 52 is grouped into eight electrode terminal groups 53 of 270 each. Then, a total of eight flexible boards 10 are connected to each electrode terminal group 53, one each.

  On the other hand, since the same drive voltage may be applied to each sustain electrode 33, each sustain electrode 33 is connected to a short-circuit line 55 that is electrically short-circuited. In order to connect the flexible substrate 58 to the short-circuit line 55, the sustain electrode electrode terminals 56 are grouped into a plurality of electrode terminal groups 57 and provided on the left peripheral portion outside the image display area (therefore, the right peripheral portion in FIG. 4). It has been. Of course, when the sustain electrode 33 is divided into a plurality of sustain electrode groups and different drive voltage waveforms are applied to each sustain electrode group, the sustain electrodes to which the same drive voltage waveform is applied are short-circuited with a short-circuit wire, What is necessary is just to connect the flexible substrate 58 with respect to each short circuit wire.

  Next, an example of a drive voltage waveform for driving the panel 30 will be described. The panel 30 divides a period of one field into a plurality of subfields, and displays an image by controlling light emission / non-light emission of each discharge cell in each subfield. Each subfield has an initialization period, an address period, and a sustain period.

  FIG. 5 is a diagram showing drive voltage waveforms applied to each electrode of panel 30 used in the plasma display device in accordance with the second exemplary embodiment of the present invention. FIG. 5 shows drive voltage waveforms for three subfields, but drive voltage waveforms in other subfields are substantially the same.

  In the initializing period of the first subfield, a voltage 0 (V) is applied to the data electrode 42 and the sustain electrode 33, and a ramp voltage that gradually increases from the voltage Vi1 to the voltage Vi2 is applied to the scan electrode 32. Thereafter, the voltage Ve1 is applied to the sustain electrode 33, and the ramp voltage that gradually decreases from the voltage Vi3 toward the voltage Vi4 is applied to the scan electrode 32. Then, a weak initializing discharge occurs in each discharge cell, and wall charges necessary for the subsequent address operation are formed on each electrode.

  Note that, as shown in the initialization period of the second and third subfields, the ramp period of the ramp voltage may be simply applied to the scan electrode 32 as the operation of the initialization period.

  In the subsequent address period, voltage Ve <b> 2 is applied to sustain electrode 33 and voltage Vc is applied to scan electrode 32. Next, a scan pulse of voltage Va is first applied to the scan electrode 32 that performs the address operation, and an address pulse of voltage Vd is applied to the data electrode 42 corresponding to the discharge cell to emit light. Then, an address discharge is generated in the discharge cell to which the scan pulse and the address pulse are simultaneously applied, and an address operation for accumulating wall charges on the scan electrode 32 and the sustain electrode 33 of the discharge cell is performed.

  Next, a scan pulse is applied to the scan electrode 32 that performs the address operation second, and an address pulse is applied to the data electrode 42 corresponding to the discharge cell to emit light. Then, an address discharge occurs in the discharge cell to which the scan pulse and the address pulse are simultaneously applied, and an address operation is performed. Such an address operation is performed in all the discharge cells that should emit light, and an address discharge is selectively generated in the discharge cells that should emit light to form wall charges.

  Thus, it is necessary to apply different drive voltages to the scan electrodes 32. The difference voltage between the voltage Vc and the voltage Va is usually about 50 (V) to 150 (V). Therefore, depending on this differential voltage, the minimum value of the distance between the connection terminals of the circuit side connection portion of the flexible substrate and the distance between the terminals of the connector to which it is connected is limited.

  In the subsequent sustain period, voltage 0 (V) is applied to sustain electrode 33. Then, a sustain pulse of voltage Vs is applied to scan electrode 32. Then, a sustain discharge occurs in the discharge cell in which the address discharge has occurred and emits light.

  Next, voltage 0 (V) is applied to scan electrode 32 and a sustain pulse of voltage Vs is applied to sustain electrode 33. Then, in the discharge cell in which the sustain discharge has occurred, the sustain discharge occurs again to emit light. Thereafter, a sustain pulse corresponding to the luminance weight is alternately applied to the scan electrode 32 and the sustain electrode 33 to cause the discharge cell to emit light.

  At this time, a large peak current accompanying the discharge flows through each of the scan electrodes 32. And in order to flow this electric current stably, the minimum value of the thickness of the wiring of a circuit board and the width | variety of the connection terminal of the circuit side connection part of a flexible substrate is restrict | limited.

  Then, at the end of the sustain period, a ramp voltage that gradually increases toward the voltage Vr is applied to the scan electrode 32, and the positive wall voltage on the data electrode 42 is left, and the scan electrode 32 and the sustain electrode 33 are left. Decrease the upper wall voltage. Thus, the maintenance operation in the maintenance period is completed.

  In the subsequent subfield, the same operation as the above-described subfield is performed. In this way, a period of one field is composed of a plurality of subfields, and gradations are displayed by controlling the subfields that cause the discharge cells to emit light.

  In a high-definition panel with a large number of pixels, when the above driving method is applied to all the display electrode pairs 34, the time required for the write operation becomes too long, and the number of subfields necessary for gradation display is secured. There is a problem that it cannot be done. However, in that case, for example, the display electrode pairs 34 are divided into a plurality of display electrode pair groups, and the required number of subfields can be ensured by applying the above-described driving method to each display electrode pair group. .

  FIG. 6 is a circuit block diagram of plasma display device 60 in accordance with the second exemplary embodiment of the present invention. The plasma display device 60 includes a panel 30, an image signal processing circuit 61, a data electrode drive circuit 62, a scan electrode drive circuit 63, a sustain electrode drive circuit 64, a timing generation circuit 65, and a power supply unit that supplies necessary power to each circuit block. (Not shown).

  The image signal processing circuit 61 converts the input image signal into image data indicating light emission / non-light emission for each subfield. The data electrode driving circuit 62 converts the image data for each subfield into an address pulse applied to each of the data electrodes 42. The timing generation circuit 65 generates various timing signals for controlling the operation of each circuit block based on the horizontal synchronization signal and the vertical synchronization signal, and supplies them to the respective circuit blocks. Scan electrode drive circuit 63 generates a drive voltage waveform to be applied to each scan electrode 32 based on the timing signal, and sustain electrode drive circuit 64 generates a drive voltage waveform to be applied to sustain electrode 33 based on the timing signal. These drive circuits are mounted on a plurality of circuit boards.

  FIG. 7 is a diagram showing a drive circuit mounted on the circuit board of plasma display device 60 in accordance with the second exemplary embodiment of the present invention, and shows an example of scan electrode drive circuit 63. A sustain pulse generator for generating a sustain pulse of scan electrode drive circuit 63 and an initialization waveform generator for generating an initialization waveform are mounted on circuit board 71. Further, the scan pulse generator 69 for generating the scan pulse is divided and mounted on the circuit board 72 and the circuit board 73. Although not shown, an image signal processing circuit 61, a data electrode drive circuit 62, a sustain electrode drive circuit 64, a timing generation circuit 65, and a power supply circuit are also mounted on each circuit board.

  FIG. 8 is an exploded perspective view showing the structure of plasma display device 60 in accordance with the second exemplary embodiment of the present invention. The plasma display device 60 includes a panel 30, a chassis 81, a heat conductive sheet 82, a circuit on which a circuit for driving the panel 30, such as a power supply circuit, a scan electrode drive circuit, a sustain electrode drive circuit, and a timing generation circuit, is mounted. A board group 83, a front frame 84 and a back cover 85 for storing them are provided.

  A scanning electrode electrode terminal 52 (not shown) is provided on one of the short sides of the panel 30 (front side in FIG. 8), and the flexible substrate 10 is connected to the scanning electrode electrode terminal 52. A flexible substrate 58 is connected to the sustain electrode electrode terminal 56 (not shown) provided on the other short side of the panel 30, and a data electrode electrode terminal (on the long side of the panel 30) (not shown). A flexible substrate 59 is connected to (not shown).

  The heat conductive sheet 82 is provided to adhere the panel 30 to the chassis 81 and to release heat generated in the panel 30 to the chassis 81. The chassis 81 holds the panel 30 on one surface via the heat conductive sheet 82, and each circuit board of the circuit board group 83 is attached to the other surface.

  In FIG. 8, among the circuit board group 83, the circuit board 71 on which the sustain pulse generation unit and the initialization waveform generation unit of the scan electrode drive circuit 63 are mounted, and the scan pulse generation unit 69 of the scan electrode drive circuit 63 are mounted. The circuit board 72 and the circuit board 73 are clearly shown. The circuit board 72 and the circuit board 73 are provided with a plurality of connectors 76 and connectors 77 for outputting drive voltage waveforms to the scanning electrodes 32, respectively. In the present embodiment, a plurality of connectors 76 that connect the circuit-side connection portions 12 of the flexible substrate 10 are provided on one surface (back surface) of the circuit board 72 and the circuit board 73. A plurality of connectors 77 for connecting the circuit side connection portion 13 of the flexible substrate 10 are provided on the other surface (front surface).

  Each of the flexible substrates 10 connected to the scanning electrode electrode terminals 52 of the panel 30 passes over the chassis 81 and is connected to each of the connector 76 and the connector 77.

  FIG. 9 is an enlarged view showing a state of connection between scan electrode electrode terminal 52 and connectors 76 and 77 of plasma display device 60 in accordance with the second exemplary embodiment of the present invention.

  The panel-side connecting portion 11 of the flexible substrate 10 is connected to a scanning electrode electrode terminal 52 (not shown) provided on one of the short sides of the front substrate 31 of the panel 30. In order to connect the flexible substrate 10 to the scan electrode electrode terminal 52, for example, the flexible substrate 10 and the scan electrode electrode terminal 52 may be overlapped and thermocompression bonded with an anisotropic conductive film interposed therebetween.

  The flexible substrate 10 is bent toward the circuit board 72 over the chassis 81 (not shown) in a state where the second board portion 18 overlaps the first board portion 16. The circuit side connection portion 12 of the flexible substrate 10 is connected to a connector 76 provided on the back surface side of the circuit board 72, and the circuit side connection portion 13 is connected to a connector 77 provided on the front surface side of the circuit board 72. .

  In FIG. 9, the chassis 81 is omitted to make the drawing easier to see, but the chassis 81 exists between the panel 30 and the circuit board 72 as shown in FIG.

  As described with reference to FIG. 5, it is necessary to apply different drive voltage waveforms to the scan electrodes 32 of the panel 30, and the different scan electrodes 32 have large values of 50 (V) to 150 (V) in the writing period. A potential difference is applied. Further, a large current needs to flow through the scan electrode 32 during the sustain period. Therefore, the pitch of the connection terminal 22 provided in the circuit side connection part 12 of the flexible substrate 10 and the connection terminal 23 provided in the circuit side connection part 13 cannot be reduced without limitation. On the other hand, in the high-definition panel, the interval between the scan electrode electrode terminals 52 is narrowed depending on the interval between the scan electrodes 32. Therefore, the pitch between the connection terminals 22 and the connection terminals 23 must be wider than the pitch between the connection terminals 21 provided in the panel-side connection portion 11.

  However, in this way, the flexible board 10 is configured and connected to the connector 76 provided on the back surface side of the circuit board 72 and the connector 77 provided on the front surface side, whereby the flexible board 10 is mounted. The width that 10 occupies can be set to be approximately the same as the width of the panel side connection portion 11. Therefore, even in an image display device in which a plurality of flexible boards 10 are mounted on the high-definition panel 30, the connectors 76 and 77 can be arranged in a line on the front and back surfaces of the circuit board 72, and are compact. An image display device can be realized.

  In the present embodiment, the flexible substrate 10 in which the distance between the panel side connection portion 11 and the circuit side connection portion 13 is longer than the distance between the panel side connection portion 11 and the circuit side connection portion 12 has been described as an example. . This is because the connector 76 is arranged on the back surface side near the end of the circuit board 72, and the connector 77 is arranged on the surface side far from the end of the circuit board 72, so that the circuit side connecting portion 12 and the connector 76 are workable. This is because the connection is made well and the circuit side connecting portion 13 and the connector 77 are connected with good workability. However, the present invention is not limited to this. For example, the connector 76 may be disposed on the back side far from the end of the circuit board 72, and the connector 77 may be disposed on the front side close to the end of the circuit board 72, and the distance from the end where the connector 76 is disposed. May be approximately equal to the distance from the end where the connector 77 is disposed. Alternatively, a plurality of connectors 76 for connecting the circuit side connection portion 12 of the flexible substrate 10 are provided on the front surface side of the circuit board 73, and the circuit side connection portion 13 of the flexible substrate 10 is connected to the back surface side of the circuit board 72 and the circuit board 73. A plurality of connectors 77 may be provided. Thus, the positions where the connector 76 and the connector 77 are arranged are the positions of the panel side connecting portion 11, the circuit side connecting portion 12 and the circuit side connecting portion 13, the base material on which the wirings 25 a, 25 b and 26 are formed. It is set depending on the surface.

(Embodiment 3)
FIG. 10 is a perspective view showing flexible substrate 110 according to Embodiment 3 of the present invention. The flexible substrate 110 is configured by bonding a first substrate unit 116 and a second substrate unit 118 together.

  The first substrate unit 116 includes the panel side connection unit 11, the circuit side connection unit 12, and the bonding unit 17. The second substrate unit 118 includes the circuit side connection unit 13 and the bonding unit 19. Since the panel side connection part 11, the circuit side connection part 12, the circuit side connection part 13, the bonding part 17, and the bonding part 19 in the third embodiment are the same as those in the first embodiment, the same reference numerals are used. The description is omitted.

  The flexible substrate 110 in the third embodiment is different from the flexible substrate 10 in the first embodiment shown in FIG. 1 in that the connection terminal 21 of the panel side connection portion 11 and the connection terminal 22 of the circuit side connection portion 12 are electrically connected. And the sum of the lengths of the wiring 25b and the wiring 26 for electrically connecting the connection terminal 21 of the panel side connection portion 11 and the connection terminal 23 of the circuit side connection portion 13 are made substantially equal. Is a point.

  Therefore, in the third embodiment, the length of the second substrate portion 118 of the flexible substrate 110 is set shorter than the length of the second substrate portion 18 of the flexible substrate 10 in the first embodiment. In this way, the length of the wiring that electrically connects the connection terminal 21 and the connection terminal 22 and the length of the wiring that electrically connects the connection terminal 21 and the connection terminal 23 are made substantially equal to each other. The impedance of the current path of each wiring passing through 110 can be made substantially equal.

  As described above, for example, a large peak current needs to flow through the scan electrode of the plasma display panel during the sustain period. At this time, if it is assumed that there is a variation in the impedance of the current path leading to each of the scan electrodes, the ringing superimposed on the drive voltage waveform also varies and the image display quality deteriorates. However, in the case of the image display device using the flexible substrate 110 in the present embodiment, the impedance of the current path of each wiring reaching each scanning electrode can be made substantially equal, so that variation in ringing is suppressed and the quality is high. An image can be displayed.

  The specific numerical values shown in the first to third embodiments are merely examples, and the present invention is not limited to these numerical values. These numerical values and the like are desirably set optimally in accordance with the characteristics of the image display device to be used and the specifications of the image display apparatus.

  The present invention is useful as an image display device because even an image display device with high definition can easily connect an electrode of the image display device and a circuit board on which a drive circuit is mounted.

DESCRIPTION OF SYMBOLS 10,110 Flexible substrate 11 Panel side connection part 12, 13 Circuit side connection part 16, 116 1st board part 17, 19 Bonding part 18, 118 2nd board part 21, 22, 23 Connection terminal 25a, 25b, 26 Wiring 30 Panel 31 Front substrate 32 Scan electrode 33 Sustain electrode 34 Display electrode pair 35, 43 Dielectric layer 36 Protective layer 41 Back substrate 42 Data electrode 44 Partition 45 Phosphor layer 51 Lead line 52 Scan electrode electrode terminal 53, 57 Electrode terminal Group 55 Short-circuit line 56 Sustain electrode terminal 58, 59 Flexible substrate 60 Plasma display device 61 Image signal processing circuit 62 Data electrode drive circuit 63 Scan electrode drive circuit 64 Sustain electrode drive circuit 65 Timing generation circuit 69 Scan pulse generation unit 71, 72, 73, 90 Circuit board 76, 77, 2,93 connector 81 chassis 82 thermal conductive sheet 83 circuit board group 84 front frame 85 back cover

Claims (2)

An image display device comprising: an image display device; a flexible substrate connected to an electrode of the image display device; and a circuit board provided with a connector for connecting the flexible substrate,
The flexible substrate is
A panel side connection having a plurality of connection terminals for connecting to the image display device and a first circuit side connection having a plurality of connection terminals for connecting to the drive circuit; A first substrate portion having a first bonding portion between the portion and the first circuit side connection portion;
A second circuit side connection portion having a plurality of connection terminals for connection to the drive circuit, and a second substrate portion having a second bonding portion for bonding to the first bonding portion. Prepared,
Formed by bonding the first bonding portion and the second bonding portion;
The circuit board is
A connector for connecting the first circuit side connection portion of the flexible substrate is provided on one surface, and a connector for connecting the second circuit side connection portion of the flexible substrate is provided on the other surface. Display device. The image display device according to claim 1, wherein the image display device is a plasma display panel.

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