JPH07140905A - Display device - Google Patents

Abstract

PURPOSE:To provide a display device which is simple and free in wiring and is capable of manufacturing at a low cost. CONSTITUTION:Motions of driving circuits 161-164 which output driving signals for displaying and are respectively provided on plural driving circuit substrates 152-155 are controlled by supplying control signals SA from a control circuit 169 in a controlling circuit substrate 156 to driving circuit substrates 152,154 among plural driving circuit substrates 152-155 and then supplying the signals respectively to the driving circuit substrate 153 from the driving circuit substrate 152 and to the driving circuit substrate 155 front the driving circuit substrate 154. In such a manner, numbers of connectors on the control circuit substrate 15 is reduced, number of manufacturing processes and number of parts are reduced and consequently manufacturing cost is reduced. Wiring patterns on the control circuit substrate are simplified, degree of freedom is increased and the ratio occupied by the wiring pattern is reduced. Thus insulation between wirings is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device using, for example, an EL (electroluminescent) element, and more particularly to a display device having a simplified wiring structure for inputting and outputting signals relating to display.

[0002]

2. Description of the Related Art FIG. 18 is a plan view showing a configuration of a conventional EL display device 1, FIG. 19 is a bottom view thereof, and FIG.
Reference numeral 0 is a perspective view showing each constituent member in an exploded manner. The EL display device 1 includes an EL element 34 including a glass substrate 2 on which an EL structure 32 is formed and a QFP (Quad Flat Package) 14
a-14c and 15a-15c are mounted on a flexible wiring board (FPC; Flexible Printed Circui).
t) 4,5, hard board (PWB; Printed Wiring Boar)
d) 6, 7, TCP (Tape Carrier Package) 8a-8
d, 9a to 9d and a drive control circuit board 18.

One surface 2a of the glass substrate 2 is a display surface of the EL display device 1. On the other surface 2b opposite to the surface 2a on the display surface side, at least a pair of electrodes EL
The EL structure 32 with the light emitting layer interposed is formed to be an EL element 34. The area where the EL structure 32 is formed is the display area 3. The pair of electrodes forming the EL structure 32 are formed in a plurality of strips and in directions orthogonal to each other, and display is performed with the region where the electrodes intersect as a pixel. For example, the arrow A direction shown in FIG.
That is, the electrodes formed in parallel with the directions of the two opposite sides 3a and 3b of the display region 3 are the scanning side electrodes, and are in the arrow B direction orthogonal to the arrow A direction, that is, the two sides 3a. , 3b, the other two opposite sides 3c,
The electrode formed parallel to the 3d direction is the data side electrode. Data signals are sequentially supplied from the data-side electrodes in accordance with the timing of scanning the scanning-side electrodes to select or deselect picture elements. In the EL light emitting layer of the selected picture element,
A voltage equal to or higher than the light emission threshold voltage at which the EL light emitting layer starts to emit light is applied, and the EL light emitting layer emits light. On the other hand, a voltage higher than the light emission threshold voltage is not applied to the EL light emitting layers of the unselected picture elements, and the EL light emitting layers do not emit light. In this manner, the line-sequential scanning type dot matrix display is implemented.

A driving circuit is provided to implement the above-described line-sequential scanning type dot matrix display.
In the area 2b of the glass substrate 2 other than the display area 3, connection terminals 33a to 33d for applying signals for display to the scanning side and data side electrodes are provided as shown in FIG. Each is provided. The flexible wiring board 4 is connected to the connection terminal 33a provided at one end of the scanning-side electrode. Specifically, as shown in FIG. 20, a plurality of connection terminals 20 are formed on the one surface 4a of the flexible wiring board 4, and the connection terminals 20 have Qs.
The leads 22 of the FPs 14a to 14c are connected to each other. Further, the connection terminal 21 of the flat cable 16 is connected to the connection terminal 21 formed on the surface 4 a of the flexible wiring board 4.

Similar to the flexible wiring board 4, the flexible wiring board 5 on which the QFPs 15a to 15c are mounted is connected to the connection terminal 33b provided at the other end of the scanning side electrode opposite to the one end. Connected. A flat cable 17 is connected to the flexible wiring board 5 in the same manner as the flat cable 16.

A hard substrate 6 is arranged on the side of the side 3c of the display area 3 on substantially the same plane as the glass substrate 2. More specifically, as shown in FIG. 20, a connection terminal 26 is formed on the hard substrate 6, and the IC chip 12 is formed on the connection terminal 26.
The connection terminals 25 of the TCPs 8a to 8d on which a to 12d are mounted are connected. A connection terminal 33c provided at one end of the data side electrode is connected to a connection terminal different from the connection terminal 25 provided in the TCPs 8a to 8d. Further, the connection terminal 28 of the flat cable 10 is connected to the connection terminal 27 provided on the hard substrate 6. The hard substrate 6 is a substrate on which wiring for inputting a signal from a control circuit substrate 18 described later to the TCPs 8a to 8d is formed, and has, for example, a two-layer structure.

A side 3d facing the side 3c of the display area 3
On the side, a hard substrate 7 similar to the hard substrate 6 is arranged on substantially the same plane as the glass substrate 2. The hard substrate 7 is connected to the TCPs 9a to 9d in the same manner as the hard substrate 6, and the connection terminals of the TCPs 9a to 9d are connected to the connection terminal 33d provided at the other end of the data side electrode. Also,
A flat cable 11 is connected to the hard substrate 7 in the same manner as the flat cable 10.

As described above, the EL structure 32 is formed on the surface 2b of the glass substrate 2 opposite to the surface 2a on the display surface side. A resin layer, for example, is formed on the EL structure 32 to prevent moisture, and the drive control circuit board 18 shown in FIG. 19 is further arranged. The control circuit board 18
A drive IC chip (not shown) is mounted on the upper part,
Further, wiring for connecting circuits is formed. Further, as shown in FIG. 20, the lead 30 of the connector 19a is inserted into the through hole 31 formed in the control circuit board 18. Similarly, the connectors 19b to 1
9c is provided. The connection terminal 29 of the flat cable 10 is connected to the connector 19a,
The connection terminal of the flat cable 11 is connected to b. The connection terminal 24 of the flat cable 16 is connected to the connector 19c, and the connection terminal of the flat cable 17 is connected to the connector 19d. At this time, the flexible wiring boards 4 and 5 to which the flat cables 16 and 17 are connected are bent to the surface 2b side opposite to the display surface side surface 2a of the board 2 by utilizing its flexibility, and E
The size of the L display device 1 can be reduced. The connectors 19a to 19d are provided on the drive control circuit board 18 in the vicinity of the four sides.

[0009]

The above-mentioned drive control circuit board 18 of the conventional EL display device 1 has four four substrates corresponding to the substrates 4 to 7 arranged so as to face the four sides of the display area 3, respectively. Connectors 19a-19d are provided. Since the conventional EL display device 1 is provided with the four connectors 19a to 19d, the number of manufacturing steps increases and the manufacturing cost increases.

Although wiring is provided on the drive control circuit board 18 from the IC chip provided on the board 18 corresponding to the respective connectors 19a to 19d,
In the conventional EL display device 1, the connectors 19a to 19d are 4
Therefore, the ratio of the wiring patterns to the connectors 19a to 19d increases. Also, the connector 19a
.. to 19d are provided near the four sides on the control circuit board 18, respectively, so that the wirings from the IC chip intersect,
There is a problem that it becomes difficult to route the wiring and the degree of freedom in designing the wiring pattern is reduced. If the degree of freedom becomes small and the wiring pattern interval becomes relatively narrow, the insulative property between the wirings deteriorates.

An object of the present invention is to provide a display device in which wiring can be laid out relatively easily and freely and which can be manufactured at low cost.

[0012]

SUMMARY OF THE INVENTION The present invention provides a display panel having a plurality of electrode terminals to which drive signals for display are provided, a drive circuit for outputting the drive signals, and the plurality of electrode terminals, respectively. A plurality of drive circuit boards that are connected and provide a plurality of drive signals, and a control circuit that outputs a control signal that collectively controls the operation of each drive circuit of the plurality of drive circuit boards are provided. A control circuit board, the control signal from the control circuit is supplied to at least one drive circuit board of the plurality of drive circuit boards, and the control signal is supplied from the drive circuit board to the remaining drive circuit boards. Is a display device.

[0013]

According to the present invention, the control signal from the control circuit of the control circuit board is supplied to at least one drive circuit board of the plurality of drive circuit boards, and the remaining drive circuit board is supplied from the drive circuit board. Is supplied to. The plurality of drive circuit boards each include a drive circuit that outputs a drive signal, and the operation of each drive circuit is centrally controlled by the control signal. The display panel includes a plurality of electrode terminals, and a plurality of connection terminals of the drive circuit board are connected to the electrode terminals, respectively, and a drive signal is supplied from the drive circuit to display.

Therefore, as compared with the case where the control signal from the control circuit of the control circuit board is supplied to each of the plurality of drive circuit boards, the control circuit board for connecting the control circuit board and the drive circuit board is connected. Fewer connectors are formed. Therefore, the number of manufacturing steps is reduced, the number of parts is reduced, and the manufacturing cost is reduced. In addition, the wiring pattern on the control circuit board is simplified and the degree of freedom is increased, and the ratio of the wiring pattern is reduced. Therefore, the wiring pattern interval is widened and the insulation between the wirings is improved.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 are views for briefly explaining the present invention. FIG. 1 is a plan view showing the display device 170.
The display panel 151a of the display device 170 is, for example, EL
A plurality of electrode terminals 157 to 160, which are realized by a panel or a liquid crystal display panel and to which drive signals for display are given, are provided. The electrode terminals 157 to 160 are provided, for example, at respective end portions of a plurality of display electrodes provided orthogonal to each other. The electrode terminals 157 to 160 are provided with driving circuits 161 to 164, respectively.
The connection terminals 165 to 168 of 155 are connected. The drive signals for the display are output from the drive circuits 161-164, respectively, and the drive signals are given to the electrode terminals 157-160 from the connection terminals 165-168.

The control circuit board 156 of the display device 170.
Includes a control circuit 169 that outputs a control signal SA that collectively controls the operations of the drive circuits 161-164.
The control circuit board 156 is provided, for example, on the side opposite to the display surface side of the display panel 151a, but is illustrated next to the display panel 151a for the sake of explanation in FIG. The control signal SA output from the control circuit 169 is applied to the drive circuit board 15 of the four drive circuit boards 152 to 155.
2, 154 are supplied to the drive circuits 161, 16 respectively.
3 is supplied. Therefore, the control circuit board 156 and the drive circuit boards 152 and 154 are connected to the circuit 169 and the circuit 16 respectively.
1, 163 are electrically connected to each other, for example, by cables 173, respectively.

The control signal SA supplied to the drive circuit board 152 is supplied to the adjacent drive circuit board 153 and then to the drive circuit 162. That is, the drive circuit board 15
For example, both of the two and 153 are formed larger than the conventional one, and the overlapping portions are connected by, for example, soldering. Therefore, the control signal SA supplied to the substrate 152 can be supplied to the substrate 153. Further, the control signal SA supplied to the drive circuit board 154 is supplied to the adjacent drive circuit board 155 and then to the drive circuit board 164. In this case also, in the same manner as the drive circuit boards 152 and 153, the boards 154 and 15
5 is connected, and it becomes possible to supply the control signal SA.

In the following description, unless otherwise specified, the drive circuit boards 152 to 155 are connected to each other by the soldering described above.

FIG. 2 is a plan view showing the display device 171. The display device 171 includes electrode terminals 157, 158, 1 of the electrode terminals 157 to 160 of the display device 170.
Since only 60 is formed, the drive circuit board 154 is not provided. In the display device 171, shown in FIG. 2, the same members as those of the display device 170 are designated by the same reference numerals.

The control signal S output from the control circuit 169
A is supplied to the drive circuit board 152 of the drive circuit boards 152, 153, 155 and is supplied to the drive circuit 161. Control signal SA supplied to the drive circuit board 152
Is supplied to the two adjacent drive circuit boards 153 and 155, and is supplied to the drive circuits 162 and 164. Also in this case, since the drive circuit boards 152, 153, 155 are formed larger than the conventional ones and the overlapping portions are connected, the control signal SA can be supplied to the boards 153, 155.

FIG. 3 is a plan view showing the display device 172. The display device 172 is formed by forming only the electrode terminals 157 and 158 of the electrode terminals 157 to 160 of the display device 170.
It does not have 4,155. In the display device 172 shown in FIG. 3, the same members as those of the display device 170 are designated by the same reference numerals.

The control signal S output from the control circuit 169
A is supplied to the drive circuit board 152 of the drive circuit boards 152 and 153 and then supplied to the drive circuit 161.
The control signal SA supplied to the drive circuit board 152 is supplied to the adjacent drive circuit board 153 to drive the drive circuit 162.
Is supplied to. Also in this case, the overlapping portions of the drive circuit boards 152 and 153, which are formed to be larger than those in the conventional case, are connected to each other, and the control signal SA is supplied to the board 152.

The supply of the control signal SA as described above is different from the case of supplying the control signal SA to each of the conventional plurality of drive circuit boards, and the control circuit for connecting the control circuit board 156 and each drive circuit board. The number of connectors on the substrate 156 is reduced, the number of manufacturing steps and the number of parts are reduced, and the manufacturing cost is reduced. Further, the wiring pattern on the control circuit board 156 is simplified, the degree of freedom is increased, and the proportion of the wiring pattern is reduced. Therefore, the space between the wirings is widened and the insulation is improved.

FIG. 4 is a plan view showing the shape of display electrodes provided on the display panel 151a of the display device 170. There are four possible display electrode shapes when the electrode terminals 157 to 160 are provided in four directions, as shown in FIGS. 4 (1) to 4 (4). In the shape shown in FIG. 4A, every other display electrode formed in parallel with each other is drawn out in a direction opposite to each other, and electrode terminals 157 to 160 are formed.
It is what This is to prevent the distance between the electrode terminals from becoming narrower due to the increase in the number of electrodes accompanying the higher definition, and by pulling out every other display electrode in the direction opposite to each other, The space becomes wider, and it becomes possible to sufficiently secure the insulation between the electrode terminals.

In the shape shown in FIG. 4B, the display electrodes formed in parallel with each other are divided substantially at their centers in order to divide the driving. In this case, the driving on the scanning side and the driving on the data side are both divided into two.
Dividing and driving prevents inconvenience that occurs as the display becomes larger. That is, when the display electrode becomes long, the distortion of the applied voltage becomes remarkable and the display unevenness occurs. However, the division as described above shortens the display electrode, reduces the distortion of the applied voltage, and reduces the display unevenness.

The shapes shown in FIGS. 4 (3) and 4 (4) are a mixture of the shapes shown in FIGS. 4 (1) and 4 (2). Driving in one direction is divided into two, and driving in the other direction is performed. Every other display electrode is drawn out in the opposite direction. In FIG. 4C, driving in the directions of the electrode terminals 157 and 159 is divided into two, and every other display electrode in the directions of the electrode terminals 158 and 160 is drawn out. FIG. 4 (4) is the opposite.

FIG. 5 is a plan view showing the shape of display electrodes provided on the display panel 151b of the display device 171. As shown in FIG. When the electrode terminals 157, 158, 160 are provided in the three directions, there are two possible display electrode shapes shown in FIGS. 5 (1) and 5 (2). In the shape shown in FIG. 5A, every other one of the display electrodes formed in parallel with each other is drawn out in the direction opposite to each other to form the electrode terminals 158 and 160, and the other display electrode is formed in one direction. Only the electrode terminal 157 is drawn out. Moreover, the shape shown in FIG.
In order to divide, the display electrode formed in the direction of the electrode terminals 158 and 160 is divided substantially at the center thereof, and
Similarly to the case shown in FIG. 5 (1), 7 is an electrode terminal 157 which is drawn out only in one direction.

FIG. 6 is a plan view showing the shape of display electrodes provided on the display panel 151c of the display device 172. As shown in FIG. When the electrode terminals 157 and 158 are provided in two adjacent directions, the display electrode shape is as shown in FIG.
You can think of the street. This is because the electrodes formed in parallel with each other are drawn out in only one direction, and
7,158.

The present invention will be described in detail below by taking the display device 171 shown in FIG. 1 as an example.

FIG. 7 is a plan view showing the construction of an EL display device 41 which is an embodiment of the present invention, FIG. 8 is a bottom view thereof, and FIG. 9 is an exploded perspective view showing respective constituent members. Is. FIG. 10 is a cutaway perspective view showing the structure of the EL element 78. The EL display device 41 includes an EL element 78, a QFP and a glass substrate 42 on which an EL structure 43 is formed.
Flexible wiring boards (hereinafter referred to as “flexible wiring boards (FPC)”) 44 and 45 on which 51a to 51c and 52a to 52c are mounted, and hard boards (PW).
B) 46, 47, TCP 48a-48d, 49a-49
d and a circuit board 50 for driving.

One surface 42a of the glass substrate 42 has an EL
It is a display surface of the display device 41. On the other surface 42b opposite to the display surface side surface 42a, the EL light emitting layer 62 is provided between at least a pair of electrodes 60 and 64 as shown in FIG.
The EL structure 43 with the interposition of
It is said that On the surface 42b of the substrate 42, for example, IT
The transparent electrode 60 realized by an O (Indium Tin Oxide) film or a Nesa film mainly composed of SnO ₂ is formed. A plurality of transparent electrodes 60, for example, 640 transparent electrodes 60 are formed in parallel with each other. An insulating layer 61 is formed on the surface 42b on which the transparent electrode 60 is formed. The insulating layer 61 is, for example, Si.
It is realized by an O ₂ film or a Si ₃ N ₄ film. An EL light emitting layer 62 is formed on the insulating layer 61. The EL light emitting layer 62 is
For example, it is realized by adding an additive such as Mn which becomes a luminescence center to a base material realized by ZnS or the like. An insulating layer 63 is formed on the EL light emitting layer 62. Insulating layer 63
Is realized by, for example, a SiO ₂ film, a Si ₃ N ₄ film or an Al ₂ O ₃ film. A metal electrode 64 made of, for example, Al is formed on the insulating layer 63. Similar to the transparent electrode 60, a plurality of metal electrodes 64 are formed in parallel to each other, for example, 400, and are formed in a direction orthogonal to the transparent electrode 60.

The region where the EL structure 43 is formed is
The display area 59 is displayed by using the area where the electrodes 60 and 64 intersect as a picture element. For example, the electrodes 60, 6 formed in the direction of arrow A shown in FIG. 7, that is, in the direction of two opposite sides 59a, 59b of the display region 59.
Any one of the four electrodes, for example, the metal electrode 64.
Is a scanning side electrode. In the arrow B direction, that is, the two opposite sides 59 different from the two sides 59a and 59b.
Electrodes formed in the c and 59d directions, that is, the transparent electrode 6
0 is an electrode on the data side. Data signals are sequentially supplied from the data-side electrodes in accordance with the timing of scanning the scanning-side electrodes to select or deselect picture elements. A voltage equal to or higher than a light emission threshold voltage at which the EL light emitting layer 62 starts to emit light is applied to the EL light emitting layer 62 of the selected pixel, and the EL light emitting layer 62 is
Emits light. On the other hand, a voltage equal to or higher than the light emission threshold voltage is not applied to the EL light emitting layer 62 of the unselected picture element,
The EL light emitting layer 62 does not emit light. In this manner, the line-sequential scanning type dot matrix display is implemented. In this embodiment, display is performed with 640 × 400 dots.

In order to carry out the above-described line-sequential scanning type dot matrix display, a driving circuit is provided. As shown in FIG. 7, on the surface 42b of the glass substrate 42 other than the display region 59 in which the EL structure 43 is formed, the scanning side and data side electrodes 6 are formed.
A plurality of electrode terminals 65a to 65d for giving signals for display to 0 and 64 are formed. The connection terminals 65a and 65b connected to the scanning side electrodes are formed in the arrow A direction and are connected to the data side electrodes 65c and 65.
d is formed in the arrow B direction.

The flexible wiring board 44 is connected to the connection terminals 65a. Specifically, as shown in FIG. 9, QFPs 51a to 51c are connected to one surface 44a of the flexible wiring board 44. In this embodiment, three QFPs 51a to 51c are connected. QFP51
The connections a to 51c are realized by connecting the leads 67 of the QFPs 51a to 51c to the plurality of connection terminals 66 formed on the flexible wiring board 44, respectively. The connection terminal 68 of the flat cable 55 is connected to the connection terminal 68 formed on the surface 44 a of the flexible wiring board 44.

Similar to the flexible wiring board 44, the flexible wiring board 45 to which the QFPs 52a to 52c and the flat cable 56 are connected is connected to the connection terminal 65b.

On the side of the side 59c of the display area 59, a hard substrate 46 is arranged on substantially the same plane as the glass substrate 42. Specifically, as shown in FIG. 9, a TCP 48a in which connection terminals 71 are formed on the hard substrate 46 and the IC chips 53a to 53d are mounted on the connection terminals 71, respectively.
The connection terminals 70 of ~ 48d are connected. In this embodiment,
Four TCPs 48a to 48d are connected. TCP48
A connection terminal 65c provided at one end of the data-side electrode is connected to a connection terminal different from the connection terminal 70 provided in a to 48d. Further, the connection terminal 72 formed at one end of the hard wiring board 46 on the flexible wiring board 44 side is connected to the connection terminal 7 of the flexible wiring board 44.
3 are connected. Similarly, the connection terminal of the flexible wiring board 45 is connected to the connection terminal formed on the other end of the hard substrate 46 on the flexible wiring board 45 side. The hard substrate 46 is a substrate on which wiring for inputting a signal from a control circuit substrate 50, which will be described later, to the TCPs 48a to 48d is formed, and has, for example, a two-layer structure.

As described above, in this embodiment, the size of the flexible wiring board 44 is made larger than the conventional size indicated by the symbol E, and the connection terminals 7 of the portion overlapping the hard board 46 are overlapped.
2, 73 are connected by soldering, for example. Similarly, the flexible wiring board 45 is also formed larger than the conventional one, and the connection terminals of the portion overlapping the hard board 46 are connected by, for example, soldering.

On the side of the side 59d of the display area 59, a hard substrate 47 similar to the hard substrate 46 is provided.
Are arranged on substantially the same plane. The hard substrate 47 is connected to the TCPs 49a to 49d similarly to the hard substrate 46, and the TCPs 49a to 49d are connected to the connection terminal 65d provided at the other end of the data side electrode. Further, the hard board 47 is connected to the flexible wiring boards 44 and 45, which are formed larger than the conventional one in the same manner as the hard board 46.

As described above, the EL structure 43 is formed on the surface 42b of the glass substrate 42 opposite to the display surface 42a. For example, a resin layer is formed on the EL structure 43 to prevent moisture, and a drive control circuit board 50 is further provided as shown in FIG. The control circuit board 50 is provided with connectors 57 and 58 to which the flat cables 55 and 56 are connected. The connector 57, as shown in FIG.
Connection is made by inserting leads 75 provided in the connector 57 into the through holes 74 provided in the. Similarly, the connector 58 is connected. The connection terminal 76 of the flat cable 55 is connected to the connector 57,
The flat cable 56 is connected to the connector 58 in the same manner as the flat cable 55. At this time, the flexible wiring boards 44 and 45 to which the flat cables 55 and 56 are connected are bent to the surface 42b side opposite to the display surface side surface 42a of the glass substrate 42 by utilizing its flexibility. As a result, the EL display device 41 can be downsized.

Notches 76 are formed in the flexible wiring boards 44 and 45. The notch 76 is a region where the flexible wiring board 44 is connected to the glass substrate 42 and the hard substrate 47, for example, as shown in FIG. 11 (1), and is located between the glass substrate 42 and the hard substrate 47. It is provided in. Similarly, it is also provided in the vicinity of the space between the glass substrate 42 and the hard substrate 46. Further, the flexible wiring board 45 is also provided with the notch 76 in the same manner. The notch 76 is provided for the purpose of reducing the load applied to the hard boards 46 and 47 when the flexible wiring boards 44 and 45 are bent.

For example, when the notch is not provided as shown in FIG. 11 (2), the connection position between the hard substrate 47 and the flexible wiring substrate 44 is the connection position between the glass substrate 42 and the flexible wiring substrate 44. If the flexible wiring board 44 is bent in the direction of the arrow C (that is, outside), the load applied to the rigid board 47 is greater when the flexible wiring board 44 is bent. When a large load is applied to the hard board 47, the connection portion between the hard board 47 and the flexible wiring board 44 is peeled off, and the wiring is broken. However, as shown in FIG. 11A, when the notch 76 is provided, it is possible to prevent the hard substrate 47 from being heavily loaded when the flexible wiring substrate 44 is bent. That is, the load is similarly applied to the hard substrate 47 and the glass substrate 42. Therefore, it is possible to prevent the connection between the hard board 47 and the flexible wiring board 44 from peeling off and breaking the wiring. The shape of the cutout is 7
The shape is not limited to a rectangle as shown by 6, and may be a shape as shown by reference numeral 77 in which the tip portion is rounded,
Further, it may have a shape other than that shown.

FIG. 12 is a block diagram showing the electrical construction of the EL display device 41. The EL display device 41 includes a timing control circuit 81, a data side common line drive circuit 82, a scanning side common line drive circuit 83, and an oscillation / frequency division circuit 8.
4, a DC (direct current) -DC converter circuit 85, data side drive circuits 86 and 87, and scan side drive circuits 88 and 89. The circuits 81 to 85 are mounted on the drive control circuit board 50. Voltages (+ 5V and + 12V in this embodiment) are supplied to the circuits 81 to 85 mounted on the control circuit board 50 from an external power source, and the circuits 81 to 85 are grounded. The data side drive circuit 86 is, for example, a TCP 48a connected to the hard substrate 46 described above.
The data side drive circuit 87 includes a hard substrate 47 including
TCP 49a-49d connected to. The scanning side drive circuit 88 is, for example, the flexible wiring board 4 described above.
4 includes QFPs 51a to 51c, and the scanning side drive circuit 89 includes QFPs 52a to 52c connected to the flexible wiring board 45.

A plurality of signals, 11 in this embodiment, are input to the timing control circuit 81 from the outside.
Reference symbol S indicates a vertical synchronization signal, and reference symbol CP1 indicates a horizontal synchronization signal. Reference numeral CP2 indicates a clock signal, and reference numeral UD
0 to UD3 are data signals on one side, and symbols LD0 to LD3 are data signals on the other side. EL display device 4 of the present embodiment
In No. 1, the data signals UD0 to UD3 and the data signals LD0 to LD3 corresponding to the upper side and the lower side are input, respectively, in order to implement the upper and lower half-division driving.

The data signals UD0 to UD3 input to the timing control circuit 81 are supplied to the data side drive circuit 8
6, and the data signals LD0 to LD3 are directly input to the data side drive circuit 87. To the timing control circuit 81, the data side and scanning side common line drive circuits 82 and 83 are connected. The timing control circuit 81 is a circuit that controls the timing of the entire circuit with respect to an input signal. In addition, the data side common line drive circuit 8
2 is data signals UD0 to UD3 and LD0 to LD3 supplied from the data side drive circuits 86 and 87 to the data side electrodes.
Control the timing of the
Apply the required voltage to. That is, the data side drive circuits 86 and 87 have the data signals UD0 to UD3 and L according to the timing controlled by the data side common line drive circuit 82.
It has a switching function for supplying D0 to LD3. Further, the scanning side common line drive circuit 83 controls the operation timing of the scanning side drive circuits 88 and 89, and applies a necessary voltage to the circuits 88 and 89. The scanning side driving circuits 88 and 89 scan the scanning side electrodes according to the timing controlled by the scanning side common line driving circuit 83,
It has a switching function for selecting or deselecting picture elements. The oscillating / dividing circuit 84 generates signals of different frequencies necessary for control based on the input clock signal CP2. In addition, the DC-DC converter circuit 85
The voltage from the input external power source is transformed, for example, amplified.

FIG. 13 is a plan view showing an example of wirings formed on the flexible wiring board 44 and the hard board 46. This corresponds to the shape of the display electrode shown in FIG. The data side signal wiring 91 and the scanning side signal wiring 92 of the drive control circuit board 50 are guided to the flexible wiring board 44 via the flat cable 55. Here, the data side signal wiring 91 is further formed on the hard substrate 4.
Guided to 6. This is realized because the flexible wiring board 44 is larger than the conventional one and the portion overlapping the hard board 46 is connected by the connection terminal as described above. In addition, the QFPs 51a and 51b mounted on the flexible wiring board 44 are connected to the scanning-side signal wiring 92.
Are connected.

For example, in the QFP 51a mounted on the flexible wiring board 44, the leads 67a to 67 are provided.
j is formed on the scanning side signal wiring 92.
The leads 67g to 67j of the FP 51a are connected. Specifically, the leads 97h and 97j are connected to the scanning-side signal wiring 92a.
And the leads 97g and 9 are connected to the scanning-side signal wiring 92b.
7i is connected. The leads 67a to 67f are connected to the scanning side electrode wirings 94a to 94f, respectively. QF
The P51b is connected to the scanning side signal wiring 92 and the scanning side electrode wiring in the same manner as the QFP 51a. Although the scanning side signal wirings 92 are shown as two in FIG. 13, the number of the scanning side signal wirings 92 is not limited to this, and may be six, for example. Further, although the scanning side electrode wirings 94 are shown as six in number, the number is not limited to this, and may be set in accordance with the number of leads of the QFP 51a, for example, 34.

The data side signal wiring 91 on the hard substrate 46 is connected to the connection terminals 70a to 70e of the TCP 48a. Specifically, the TCP 48 is attached to the signal wiring 91a on the data side.
The connection terminal 70a of "a" is connected, and one connection terminal is connected to one data side signal wiring. The TCP 48a is connected to the data side electrode wirings 93a to 93i via the IC chip 53a. The TCP 48b is similar to the TCP 48a, and the data side signal wiring 91
And the data side electrode wiring. Although FIG. 13 shows the number of data-side signal wirings 91 as five, the number of data-side signal wirings 91 is not limited to this, and may be ten, for example. Although the number of the data-side electrode wirings 93 is shown as nine, the number is not limited to this, and the number may be according to the number of lead lines from the TCP 48a, for example, 160 or 8.
It may be zero.

In FIG. 13, the flat cable 55
Although the case where the wirings 91 and 92 from the flat cable 56 are guided to the flexible wiring board 44 is illustrated, the wirings from the flat cable 56 are similarly guided to the flexible wiring board 45. Further, in the present embodiment, the example in which the wiring from the flat cable 55 is guided to the flexible wiring board 44 and further to the hard board 46 has been described, but the flat cable 5 can be obtained by appropriately selecting the wiring pattern.
It is also possible to lead from 5 to the flexible wiring board 44 and then lead to the hard board 46 and the hard board 47.

FIG. 14 is a plan view showing an example of the wiring formed on the control circuit board 50. Control circuit board 5
0, the timing control circuit 81 realized by an IC chip or the like, the data side and scanning side common line drive circuits 82 and 83, and the oscillation / frequency division circuit 84.
And a DC-DC converter circuit 85 are arranged. Further, the connectors 57 and 58 and the connector 96 are arranged. The connector 96 includes an external circuit,
A cable (not shown) for connecting to a circuit provided on the control circuit board 50 is connected.

From the external circuit connected to the connector 96, the voltage and signal for driving described above are input.
From the connector 96, the timing control circuit 81
A plurality of lines (5 in this embodiment) for inputting the signal to
Book) wiring 112 is provided. Further, a plurality (three in the present embodiment) of wirings 113 for applying a voltage to the DC-DC converter circuit 85 is provided from the connector 96. The signal input from the timing control circuit 81 is supplied to the data side and scan side drive circuits 86 and 87.
A plurality of wires (in this embodiment, nine wires) 114, which are connected to the connectors 57 and 58 for direct input to
115 are provided respectively. Further, a plurality of (four in this embodiment) wirings 116 and 117 for connecting the timing control circuit 81 and the data side and scanning side common line drive circuits 82 and 83 are provided, respectively.

From the data side common line drive circuit 82, in order to input the signal from the circuit 82 to the data side drive circuit 86, a plurality of connectors (in this embodiment, three connectors) are connected to the connectors 57 and 58. ) Wirings 118 and 119 are provided respectively. Similarly, from the scanning side common line drive circuit 83, in order to input the signal from the scanning side drive circuit 87 to the scanning side drive circuit 87, a plurality of lines are connected to the connectors 57 and 58 (four lines in this embodiment). Wiring 120, 121
Are provided respectively. Further, a plurality of (four in the present embodiment) wirings 122 for connecting the timing control circuit 81 and the oscillation / frequency dividing circuit 84 are provided, and the timing control circuit 81 and the DC-DC converter circuit 85 are connected. A plurality of (four in this embodiment) wirings 123 are provided. Further, a plurality of (four in this embodiment) wirings 124 that connect the scanning side common line drive circuit 83 and the DC-DC converter circuit 85 are provided. The wirings 112 to 124 are provided so as to maintain insulation therebetween, and are formed by using, for example, a well-known photolithography method.

FIG. 15 shows the wirings 112 to 112 shown in FIG.
13 is a plan view showing an example of wiring formed on a conventional control circuit board 18 for driving, for comparison with 124. FIG. The circuit 81 is also provided on the conventional control circuit board 18 as in the present embodiment.
~ 85 are arranged. Also, four connectors 19a-1
9d and the connector 97 are arranged. Connector 19a-
Cables for making electrical connection to a substrate having a drive circuit are connected to 19d. Also, the connector 97
A cable (not shown) for connecting a circuit provided outside to a circuit provided on the control circuit board 18 is connected to the.

From the connector 97, for example, five wires 125 connected to the timing control circuit 81 are provided, and also, for example, three wires 126 connected to the DC-DC converter circuit 85 are provided. From the timing control circuit 81, connectors 19a-1
Wirings 127 to 130 respectively connected to 9d are provided. For example, three wirings 127 and 128 are provided, and six wirings 129 and 130 are provided, respectively. Further, the timing control circuit 81 is provided with wirings 131 and 132 which are connected to the data side and scanning side common line drive circuits 82 and 83, respectively.
For example, four wirings 131 are provided, and three wirings 132 are provided, for example. The data side common line drive circuit 82 is connected to the connectors 19c and 19d, respectively.
For example, three wires 133 and 134 are provided respectively. From the scan side common line drive circuit 83, the connector 19
a and 19b, respectively, for example, 4 each
Book wirings 135 and 136 are provided. Further, for example, four wirings 137 are provided for connecting the timing control circuit 81 and the oscillation / frequency dividing circuit 84, and for example, three wirings 137 are provided for connecting the timing control circuit 81 and the DC-DC converter circuit 85. The wiring 138 is provided. Further, the scanning side common line drive circuit 83 and the DC
-For example, four wirings 139 for connecting to the DC converter circuit 85 are provided. The wirings 125 to 139
Like the wirings 112 to 124, is provided so as to maintain insulation between them, and is formed by using, for example, a well-known photolithography method.

Wirings 112 to 12 on the substrate 50 of this embodiment
4 is compared with the wirings 125 to 139 on the board 18 of the conventional example, the number of connectors is halved in this embodiment, and as shown in FIG. It is provided near two sides. For this reason, the wirings 114 and 115 connecting the timing control circuit 81 and the connectors 57 and 58 have the conventional wiring direction of 4 or less.
In contrast to the direction, the present embodiment has two directions. In addition, the data side common line drive circuit 82 and the connectors 57 and 58
Wirings 118 and 119 for connecting to and the wiring 1 for connecting the scanning side common line drive circuit 83 and the connectors 57 and 58
The routing directions of 20, 121 are also the same.

Therefore, the number of parts arranged on the substrate 50 is reduced, and the degree of freedom of the wiring pattern formed on the substrate 50 is increased. In addition, the wiring direction is reduced, which facilitates the wiring. As a result, it is possible to secure a sufficient wiring pattern interval, improve the insulation between the wirings, and improve the reliability. Further, since the number of connectors is reduced, it is possible to reduce the manufacturing time and cost.

Although the EL display device 41 has been described as an example in the present embodiment, examples of a liquid crystal display device and other flat display devices are also within the scope of the present invention.
However, it is preferably realized in the EL display device by the following description.

The EL display device is compared with a liquid crystal display device which is widely used as a display means for OA equipment and the like.
It is characterized by high drive voltage. For example, in the case of a liquid crystal display device, the common side and segment side drive voltages are both about 40V, in the EL display device the scan side (common side) drive voltage is about 200V, and the data side (segment side) drive voltage is It is about 50V. As described above, since the EL display device is driven by a driving voltage different from that of the liquid crystal display device, a driving IC chip suitable for the EL display device is required.

Conventionally, a QFP type driving IC chip has been used for an EL display device. Specifically, QF
A method of connecting a flexible wiring board on which P is mounted to an EL display element, or a method of connecting a hard substrate on which QFP is mounted to an EL display element using the flexible wiring board has been implemented. Here, in order to reduce the size of the display device, the flexible wiring board is bent to the side opposite to the display surface side as described in the present embodiment. Since the bent flexible wiring board and the rigid board are arranged so as to face four different sides of the display area, it is structurally and manufacturable to directly connect the flexible wiring board and the rigid board. Have difficulty. Therefore, the flexible wiring board and the rigid board are connected to the drive control circuit board by a cable or the like.

However, recently, a TCP type IC has been used as a data side driving IC chip having a relatively low driving voltage.
The chip was developed. If TCP is used, the above-mentioned QF
Compared with the case of using P, the size of the substrate is several tens of minutes.
Can be as large as Further, as described above, the device can be downsized without being bent. On the other hand, on the scanning side where the driving voltage is high, reliability against copper migration between patterns on a TAB (Tape Automated Bonding) film used for TCP can be ensured, and there is no TCP with high withstand voltage that does not cause a short circuit. The method as described above is still used at present.

From the above, the EL display device 4 of the present embodiment
TCP 48a to 48d, 49a to the data side as shown in FIG.
49d, and hard substrates 46 and 47, Q on the scanning side
An EL display device using the FPs 51a to 51c, 52a to 52c and the flexible wiring boards 44 and 45 has been realized. The present invention is preferably used in such an EL display device.

FIG. 16 shows a TCP 10 used as an IC chip for driving the data side of the EL display device according to the present invention.
It is a top view which shows 1,102. 16 (1) shows TCP
101, and FIG. 16 (2) shows the TCP 102. T
In both CPs 101 and 102, IC chips 105 and 106 are mounted on substrates 103 and 104, respectively. The IC chip 105 mounted on the substrate 103 has an elongated shape, and the output terminal 105a is one of the IC chip 105.
They are provided in a line along one side. On the other hand, substrate 1
The IC chip 106 mounted on the board 04 has a substantially square shape as shown in FIG.
a is provided along the three sides of the IC chip 106. IC
Output terminals 105a provided on the chips 105 and 106,
106a is one side 103 of the substrates 103 and 104.
The connection terminals 107 and 108 are formed by being guided to the a and 104a sides. Further, the connection terminals 10 are provided on the substrates 103 and 104.
9,110 are formed.

Since the IC chip 105 of the TCP 101 has an elongated shape, the length D1 in the lateral direction shown in FIG. 16A is shorter than the length D2 of the TCP 102. Therefore, by using the TCP 101, the EL display device can be downsized. Such a TCP 101 is called a slim type TCP.

The flat cable 5 is used in this embodiment.
Although an example in which the flexible wiring boards 44 and 45 are connected to the drive control circuit board 50 by 5, 56 has been described, the hard boards 46 and 47 and the drive control circuit board 5 are described.
An example of connecting 0 and 0 also belongs to the scope of the present invention.
The same effect as that of this embodiment can be obtained.

FIG. 17 shows an EL which is another embodiment of the present invention.
3 is a bottom view of the display device 101. FIG. The EL display device 111 of the present embodiment is configured almost the same as the EL display device 41, but the drive control circuit board 50 is provided with only one connector 57, and the connector 57 has a flexible wiring. Flat cable 5 connected to the board 44
By connecting 5, the circuit board 50 and the flexible 44 are connected. Therefore, the flat cable 56 and the connector 58 described above are not provided. The reference numerals shown in FIG. 17 are the same as those in the above-mentioned embodiment.

According to this embodiment, the drive control circuit board 5
Since only one connector 57 is provided on 0, the degree of freedom of the wiring pattern on the control circuit board 50 is increased and the wiring is further facilitated. However, the flexible wiring boards 44, 45 and the hard boards 46,
The wiring of 47 is many and becomes long. The longer the signal wiring, the more susceptible it is to external noise. In addition, if the wiring of the power supply system becomes long, the voltage becomes unstable due to the increase in wiring resistance. To prevent these inconveniences,
Although it is necessary to take measures such as thickening the wiring, in order to realize this, it is necessary to use substrates having a multilayer structure as the hard substrates 46 and 47. In addition, when the number of wirings increases, it is necessary to make the distance between the wirings finer, and it is necessary to take measures such as improving the insulation between the wirings. If the above measures are taken, inconveniences such as an increase in manufacturing cost may occur, so it is considered that the example in which two connectors 57 and 58 are provided as in the previous embodiment is generally preferable.

[0066]

As described above, according to the present invention, the drive signals for display are output, and the operation of the drive circuits provided in each of the plurality of drive circuit boards is controlled by the control circuit of the control circuit board. The signal is supplied to at least one drive circuit board of the plurality of drive circuit boards, and is supplied from the drive circuit board to the remaining drive circuit boards to be controlled collectively.

Therefore, the number of connectors formed on the control circuit board is reduced, the number of manufacturing steps and the number of parts are reduced, and the manufacturing cost is reduced. In addition, the wiring pattern on the control circuit board is simplified and the degree of freedom is increased, and the ratio of the wiring pattern is reduced. Therefore, the wiring pattern interval is widened and the insulation between the wirings is improved.

[Brief description of drawings]

FIG. 1 is a display device 170 for briefly explaining the present invention.
FIG.

FIG. 2 is a display device 171 for simply explaining the present invention.
FIG.

FIG. 3 is a display device 172 for briefly explaining the present invention.
FIG.

FIG. 4 is a plan view showing a shape of a display electrode of the display device 170.

5 is a plan view showing a shape of a display electrode of the display device 171. FIG.

6 is a plan view showing a shape of a display electrode of the display device 172. FIG.

FIG. 7 is a plan view showing a configuration of an EL display device 41 which is an embodiment of the present invention.

8 is a bottom view of the EL display device 41. FIG.

FIG. 9 is a perspective view showing the components of the EL display device 41 in an exploded manner.

10 is a cutaway perspective view showing an EL element 48. FIG.

FIG. 11 is a perspective view showing a notch 76 provided in the flexible wiring boards 44 and 45.

FIG. 12 is a block diagram showing an electrical configuration of the EL display device 41.

FIG. 13: Flexible wiring board 44 and hard board 4
6 is a plan view showing an example of wiring formed in FIG.

14 is a plan view showing an example of wiring formed on the drive control circuit board 50. FIG.

FIG. 15 is a plan view showing an example of wiring formed on a conventional drive control circuit board 18.

16 is a plan view showing TCPs 101 and 102. FIG.

FIG. 17 is an EL display device 11 which is another embodiment of the present invention.
It is a bottom view of 1.

FIG. 18 is a plan view showing a configuration of a conventional EL display device 1.

FIG. 19 is a bottom view of the EL display device 1.

FIG. 20 is an exploded perspective view showing each constituent member of the EL display device 1.

[Explanation of symbols]

 41 EL display device 44,45 Flexible wiring board 46,47 Hard board 48a-48d, 49a-49d TCP 50 Control circuit board 51a-51c, 52a-52c QFP 55,56 Flat cable 57,58 Connector 65a-65d Connection terminal 78 EL element

Claims (1)

[Claims] 1. A display panel having a plurality of electrode terminals to which a drive signal for display is applied, a drive circuit for outputting the drive signal, and a drive circuit connected to each of the plurality of electrode terminals to provide the drive signal. A plurality of drive circuit boards having a plurality of connection terminals, and a control circuit board having a control circuit that outputs a control signal that collectively controls the operation of each drive circuit of the plurality of drive circuit boards, A display device comprising: supplying a control signal from a control circuit to at least one drive circuit board of the plurality of drive circuit boards, and supplying the control signal from the drive circuit board to the remaining drive circuit boards.