JPH02772Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a display device, and includes a first electrode or terminal connected to an integrated circuit on a first printed circuit board of a display element and a power terminal connected to a power supply terminal on a second printed circuit board. By connecting the first printed circuit board and the second printed circuit board, all the integrated circuits and other circuit elements are arranged within the projected area of the display element, and the installation area is small. It is an object of the present invention to provide a display device that does not require jumper wires or lead wires for wiring between the substrate and the substrate.

As shown in FIG. 1, in a conventional electronic watch, a fluorescent display tube 2 is disposed on a component arrangement surface 1a of a printed circuit board 1 at a predetermined distance from the printed circuit board 1, and the fluorescent display tube 2 is disposed on a component arrangement surface 1a of a printed circuit board 1 at a predetermined distance from the printed circuit board 1. light display tube 2
A flat pack type integrated circuit 3 for an electronic watch is arranged at a position corresponding to the above, and circuit elements 4, 5, etc. constituting, for example, a power supply circuit of the electronic watch are arranged near the fluorescent display tube 2 on the component arrangement surface 1a. has been done. When this conventional electronic timepiece is to be used, for example, in a vehicle, there is a demand for one with a small mounting area. In order to reduce the installation area, the fluorescent display tube 2
Although it is conceivable to increase the separation distance between the integrated circuit 3 and the printed circuit board 1 and arrange the circuit elements 4 and 5 between them, the integrated circuit 3 and the printed circuit board 1 may be placed at a position corresponding to the fluorescent display tube 2 on the solder dip surface 1b. Since the wiring pattern for the integrated circuit 3 is provided, it is not possible to provide a wiring pattern for the circuit elements 4 and 5, and the circuit elements 4, 5, etc. are essentially placed between the fluorescent display tube 2 and the printed circuit board 1. It cannot be placed. Therefore, there is a drawback that the mounting area of this electronic timepiece cannot be made small.

The present invention eliminates the above-mentioned drawbacks, and each embodiment thereof will be explained with reference to FIG. 2 and the following figures.

FIG. 2 shows an exploded perspective view of the first embodiment of the display device according to the present invention. In the figure, 10 is a fluorescent display tube. Electrodes 10a to 10l are provided on the substrate glass 11 of this fluorescent display tube 10, and lead wires are not provided as in a normal fluorescent display tube.
Among these electrodes 10a to 10l, electrodes 10a to 10l
10e, 10h to 10l are guided into the fluorescent display tube 10, and the electrode 10a is connected to the fluorescent display tube 10.
connected to one end of the inner flyment.
Further, the electrodes 10b to 10d and 10i to 10k are connected to each segment of the fluorescent display tube 10.
Although the number of segments is 20 or more in the case of a time display, FIG. 2 shows only the above-mentioned six of the electrodes connected to each segment. The first electrode 10e is connected to a grid inside the fluorescent display tube 10. Second
The electrode 10f as an electrode is not led into the fluorescent display tube 10 but is connected to the electrode 10e on the substrate glass 11. Further, the electrode 10 as the first electrode
h is connected to the ground terminal of the flyment inside the fluorescent display tube 10. The second electrode 10g is not led into the fluorescent display tube 10 but is connected to the electrode 10h on the glass substrate.

Reference numeral 12 denotes a flat pack type integrated circuit for an electronic watch, which supplies a time display signal to the fluorescent display tube 10. The lead wires 12a to 12h
Each tip is formed to be flush with the bottom surface 12i of the integrated circuit 12 in FIG. Lead wires 12a to 1 of this integrated circuit 12
2c, 12f to 12h are output terminals for outputting signals for causing each segment of the fluorescent display tube 10 to emit light, and lead wires 12d and 12e are input terminals to which power is supplied.

Reference numeral 13 designates a flexible printed circuit board as a first printed circuit board, and electrodes 14a to 21a are formed at the center of this wiring surface 13a, and electrodes 14b to 21b are formed at the peripheral edge. Electrode 1
4a to 16a, 19a to 21a are each electrode 14b
16b and 19b to 21b, respectively, by wiring patterns. Furthermore, chipped circuit elements 31, 32, 33, etc. are fixed to the wiring surface 13a. The electrode 17a is connected to the circuit elements 31 and 32.
The electrode 17b is connected to one end of each circuit element 3.
1 is connected to the other end. The electrode 18a is connected to one end of the circuit element 33, and the electrode 18b is connected to the other end of the circuit elements 32 and 33. The integrated circuit 12 described above is arranged approximately at the center of this printed circuit board 13, and the lead wires 12a to 12h are connected to the electrodes 14a to 2.
1a, and these are soldered and fixed. After this, the electrode 14 of the printed circuit board 13
A conductive adhesive made of a mixture of epoxy resin and a conductive material such as carbon powder is applied to each of b to 21b, and one side of the printed circuit board 13 provided with the electrodes 14b to 17b is bent to form the electrodes 14b to 17b. Each of the electrodes 10b to 10e of the substrate glass 11 is brought into contact with and adhered to, and one side of the printed circuit board 13 provided with the electrodes 18b to 21b is bent to form the electrodes 18b to 10e.
Each of the electrodes 21b is brought into contact with and adhered to each of the electrodes 10h to 10k. Further, during the above bonding, an adhesive is applied to the upper surface 12j of the integrated circuit 12 in FIG. 2, and the integrated circuit 12 is adhesively fixed to the lower surface of the substrate glass 11 of the fluorescent display tube 10.

22 to 25 are support terminals made of conductive metal, for example. The support terminal 22 holds the electrode 10a portion of the substrate glass 11 between the support piece 22a and the support pieces 22b and 22c, so that the support piece 22a supports the electrode 10a.
Connected by pressure welding. Similarly, the support terminal 23
~25 supporting pieces 23a~25a each serve as the electrode 10
f, 10g, and 10l, respectively.

26 is a second printed circuit board, and circuit elements 27 to 29 constituting the power supply circuit of the electronic watch are arranged on the component arrangement surface 26a, and the lead wires of these circuit elements 27 to 29 are connected to the printed circuit board 26. It is soldered to a wiring pattern (not shown) provided on the solder dip surface 26b. Support terminals 22 to 25 attached to the above substrate glass 11
Each of the legs 22d to 25d is a printed circuit board 2.
The second printed circuit board 26 is inserted through each of the holes 30a to 30d from the component placement surface 26a of No. 6, and is soldered and fixed to the wiring pattern on the solder dip surface 26b, and the second printed circuit board 26 is spaced apart from the first printed circuit board 13 by a predetermined distance. It is assembled as shown in FIG.

When the electronic timepiece shown in FIG. 2 is used in a vehicle, it is wired as shown in the circuit diagram shown in FIG. 4. In FIG. 4, a power terminal 34 is connected to the battery of the automobile to be supplied with power, a power terminal 35 is grounded, and a power terminal 36 is connected to the ignition switch of the automobile to be supplied with power when the engine is running. These power terminals 34-36
is provided on the second printed circuit board 26 shown in the second figure. The voltage at terminal 34 is applied to the grid of fluorescent display tube 10. Further, a power supply circuit 37 composed of resistors R ₁ , R ₂ , diodes D ₁ , D ₂ , and a capacitor C ₁ uses the power supplied from terminals 34 and 35 at a predetermined voltage and current value to supply power to the integrated circuit 12 .
supply to. The circuit elements constituting this power supply circuit 37 are arranged on the printed circuit board 13 shown in the second figure, and the circuit elements 31, 32, and 33 have resistors R ₁ ,
A diode D ₁ and a resistor R ₂ are made into a chip. In FIG. 2, circuit elements corresponding to the diode D ₂ and the capacitor C ₁ are omitted. Resistance R ₃ , R ₄ ,
A power supply circuit 38 consisting of a diode _D3 is connected to a terminal 35,
The power supplied from 36 is supplied to the fluorescent display tube 10 as a predetermined voltage and current value. Resistance R ₃ , R ₄ ,
The diode D ₃ is connected to the circuit element 27 shown in the second diagram, respectively.
28 and 29, and are arranged on the printed circuit board 26.

That is, the support terminal 23 in FIG. 2 is connected to the terminal 34 on the printed circuit board 26,
A voltage is applied to the grid of the fluorescent display tube 10 via the support terminal 23 and the electrodes 10f and 10e.
Further, the support terminal 24 is connected to a terminal 35 on the printed circuit board 26, and one end of the filament of the fluorescent display tube 10 is grounded via the support terminal 24 and the electrodes 10g and 10h. In addition, the electrode 10
Since the electrode 17b of the printed circuit board 13 is connected to e, and the electrode 18b is connected to the electrode 10h, power is supplied from terminals 34 and 35 to a power supply circuit 37 composed of circuit elements 31 to 33, etc. .
Further, the support terminal 22 is connected to one end of a resistor R ₄ (circuit element 28) on the printed circuit board 26, and power is supplied to the filament of the fluorescent display tube 10 via the support terminal 22 and the electrode 10a.

This electronic watch has an integrated circuit 12 as shown in FIG.
and a circuit element 27 that constitutes a power supply circuit, etc.
29, etc. are all arranged and housed within the projected area of the fluorescent display tube 10. Therefore, the mounting area of the electronic timepiece is smaller than that of a conventional electronic timepiece in which circuit elements are arranged near the fluorescent display tube 2, making it suitable for use in a vehicle.

Further, since the electrodes 10e and 10f of the fluorescent display tube 10 are connected, the integrated circuit 12 and the power supply circuit 37 disposed on the printed circuit board 13 and the power supply terminals 34 and 35 disposed on the printed circuit board 26 are connected to each other. ,36
and the power supply circuit 38 can be connected without using jumper wires or lead wires.

5A and 5B show a second embodiment of the device of the present invention. In both figures, the same parts as in FIG. 2 are denoted by the same reference numerals, and their explanations will be omitted. In FIGS. 5A and 5B, 40 is a fluorescent display tube, from one side of which terminals 40a to 40f are led out, and from the other side of which terminals 40l and the like are similarly led out. terminal 40
a to 40l are electrodes 1 in the fluorescent display tube 10, respectively;
They are the same as 0a to 10l, and their explanation will be omitted. The vertical lengths of the terminals 40a, 40f and the opposing terminal 40l are the same and longer than the other terminals 40b to 40e. Terminal 40e as the first terminal and terminal 4 as the second terminal
0f is short-circuited inside the fluorescent display tube 40, and the two terminals on the opposite terminal 40l side are also short-circuited inside the fluorescent display tube.

The fluorescent display tube 40 is mounted on the first printed circuit board 41 by inserting the terminals 40a to 40l into holes formed in the first printed circuit board 41. The integrated circuit 12 and circuit elements 31 to 33 are arranged on the printed circuit board 41 like the printed circuit board, and the terminals 40b to 4 are disposed on the printed circuit board 41.
0e are lead wires 12a to 12 of the integrated circuit 12, respectively.
d, and the terminals facing the terminals 40b to 40e on the side surface of the terminal 40l are soldered to the lead wires 12e to 12h.

Thereafter, the terminals 40a, 40f, 40l and the terminals facing the terminal 40f on the side surface of the terminal 40l are inserted into the holes 30a to 30d of the second printed circuit board 26. In this printed circuit board 26, a terminal 40a is connected to one end of a resistor R ₄ (circuit element 28), and a terminal 40f and a terminal opposite thereto are connected to power supply terminals 34 and 35, respectively.

Therefore, the printed circuit boards 26 and 41 can be connected without using jumper wires or lead wires.

Incidentally, the fluorescent display tube 40 may be constructed as shown in FIG. In FIG. 6, a terminal 40e is led out from the fluorescent display tube 40, and a terminal 40f is branched from the terminal 40e outside the fluorescent display tube 40.

As described above, the display device according to the present invention includes a first printed circuit board on which an integrated circuit for supplying display signals to a display element is disposed and supported by the display element, and a power supply terminal and a power supply circuit. A display device comprising a second printed circuit board provided apart from a first printed circuit board, a first electrode or terminal of a display element connected to an integrated circuit on the first printed circuit board; The second electrode or terminal of the display element connected to the power supply terminal on the second printed circuit board is connected to the second electrode or terminal of the display element connected to the power supply terminal on the second printed circuit board, and the power from the power supply terminal is connected to the first and second electrodes or terminals of the display element connected to each other. Since the integrated circuit is supplied through the terminal, all of the circuit elements constituting the integrated circuit and the power supply circuit are arranged and housed within the projected area of the display element, reducing the installation area of this device. The integrated circuit and other circuits on the second printed circuit board can be connected to the power terminals on the second printed circuit board without using jumper wires, lead wires, etc., and the number of parts is small and assembly is easy. It is something that you have.

[Brief explanation of drawings]

Figure 1 is a side view of an example of a conventional display device, Figure 2 is a side view of an example of a conventional display device;
Figure 3 is an exploded perspective view and side view of the first embodiment of the device of the present invention, Figure 4 is a circuit diagram of an embodiment of the device shown in Figure 2, and Figure 5A is the second embodiment of the device of the present invention. FIG. 5B is a side view of the second embodiment of the device of the present invention as seen from the direction of arrow VB, and FIG. 6 is a perspective view of the display element of FIG. 5A. It is a perspective view of a modification. 10, 40... Fluorescent display tube, 10a to 10l,
14a-21a, 14a-21b... electrode, 11
...Substrate glass, 12...Integrated circuit, 13,2
6, 41... Printed circuit board, 22-25... Support terminal, 27-29... Circuit element, 30a-30d
... Holes, 34-36 ... Power terminals, 37, 38...
...Power supply circuit, 40a to 40l...terminal.

Claims (1)

[Scope of utility model registration request] A display element, a first printed circuit board provided with an integrated circuit for supplying display signals to the display element and supported by the display element, and a first printed circuit board provided with a power supply terminal and a power supply circuit. A display device comprising a second printed circuit board provided at a further distance, a first electrode or terminal of the display element connected to the integrated circuit on the first printed circuit board;
A second electrode or terminal of the display element connected to the power terminal on the second printed circuit board is connected, and power from the power terminal is connected to the first and second terminals of the display element connected to each other. A display device configured to supply the integrated circuit via a second electrode or terminal.