JPS6119994B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an optical display panel that is integrated into an LSI in a small electronic device that has an optical display panel that performs optical display.
It relates to a connection structure that electrically connects to a package.

2. Description of the Related Art In recent years, electronic wristwatches have been actively developed that digitally display the time on a liquid crystal panel or the like using micro-sized batteries such as silver oxide batteries.
Conventionally, this type of electronic wristwatch has been constructed, for example, as shown in FIGS. 1 and 2, respectively.
That is, 1 is an upper housing, 2 is a lower housing, and the housing of the electronic wristwatch is constituted by the combination of these. Fitting hole 3 of upper housing 1
A liquid crystal panel 4 for digitally displaying time, date, etc., supported by a presser member (not shown) is fitted into the panel. External lead-out terminals of the liquid crystal panel 4 are provided on both sides of the lower surface of the liquid crystal panel 4, and these terminals are connected to a circuit board 6 separately arranged on the lower surface of the liquid crystal panel 4 via an interconnector 5. It is electrically connected to terminal 7. On the bottom surface of the circuit board 6,
An LSI 8, a crystal resonator, a silver oxide battery 10, a temperature compensation capacitor 11, a trimmer capacitor 12, etc. are installed. A lower housing 2 is disposed on the lower surface of the circuit board 6, and the lower housing 2 has storage holes 13, 14, and 15 into which a crystal resonator 9, a silver oxide battery 10, and a trimmer capacitor 12 are inserted, respectively. It is perforated. Thus, the upper housing 1, the circuit board 6, and the lower housing 2 are fixed with screws or the like (not shown), with the interconnector 5 interposed between the terminals of the liquid crystal panel 4 and the circuit board 6.

However, in such conventional ones,
It requires a patterned circuit board to mount and fix electronic components such as the LSI 8 and crystal oscillator 9, as well as to electrically connect each component.Moreover, the external lead-out terminals of the liquid crystal panel are interconnected. Through-hole processing or the like must be performed on the circuit board in order to establish an electrical connection between the terminals on the circuit board that are electrically connected through the connector and the electronic components mounted on the bottom surface of the circuit board. Therefore, an expensive circuit board is required, which not only increases the number of parts but also has poor workability and productivity. In addition, since liquid crystal panels and other electronic components are indirectly connected via pattern wiring, if there is a disconnection in the circuit pattern, malfunctions or other inconveniences may occur, resulting in poor reliability. It wasn't.
Furthermore, since the interconnector 5 is simply held between the external terminals of the liquid crystal panel 4 and the terminals 7 of the circuit board 6 during assembly, there is a risk of misalignment, making the assembly complicated. I couldn't escape.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an electrical connection structure for an optical display panel that has a small number of parts, can improve workability and mass productivity, and has excellent reliability.

An embodiment in which the present invention is applied to an electronic wristwatch will be described below with reference to FIG.

In FIG. 3, 20 is an upper housing, 21 is a lower housing, and by combining these, the housing of the electronic wristwatch is constructed. A rectangular fitting hole 22 is formed approximately in the center of the upper housing 20 . A rectangular fitting hole 23 is formed in the lower housing 21 at approximately the center thereof.
Also, a strip-shaped accommodation hole 2 is provided along one side edge of the fitting hole 23.
4 is formed, and a circular accommodation hole 25 is further formed on the other side edge of the fitting hole 23. A liquid crystal panel 26 for digitally displaying time, date, etc. is fitted into the fitting hole 22 of the upper housing 20 and supported by panel holding plates 27 attached to both side edges of the fitting hole 22. The liquid crystal panel 26
External lead-out terminals (not shown) of the liquid crystal panel are provided at intervals on the lower surface of both sides of the LCD panel. Terminals of the liquid crystal panel 26 are electrically connected to terminals 34 of an LSI package 31, which will be described later, via an interconnector 28. The interconnector 28 has a large number of linear terminals 30 arranged at intervals in the longitudinal direction on the outer peripheral surface of a rectangular bar-shaped rod 29 made of an elastic insulating member such as rubber.
It is wrapped with

Reference numeral 31 denotes a flat LSI package that is electrically connected to the liquid crystal panel 26 and other electronic components. It consists of rectangular plate-shaped substrates 32 made of a material such as synthetic resin or ceramic and having approximately the same size. Step portions 33 having a predetermined width, that is, a width corresponding to the width of the interconnector 28 are formed over the entire length on both edges in the longitudinal direction of the rectangular plate-shaped substrate 32, and the liquid crystal display is placed on the upper surface of the step portion 33. Terminals 3 corresponding to the terminals of the panel 26 and electrically connected to the LSI chip
4, and terminals 35 electrically connected to the LSI chip are provided on both sides of the rectangular plate-shaped substrate 32 in the width direction. Incidentally, two predetermined terminals 34a and 34b of the terminals 34 provided on the upper surface of one step portion 33 are each extended to a predetermined length and are bent into a predetermined shape. 36 is a silver oxide battery, which is located at one step 3 of the LSI package 31.
3, the anode (i.e. peripheral surface) is connected to the terminal 34a, and the cathode (i.e. top)
4b, respectively. 3
Reference numeral 7 denotes a crystal resonator, which is disposed along the other step 33 of the LSI package 31 so as to be located substantially on the same plane as the LSI package 31.
8 are respectively soldered to two predetermined terminals among the terminals 34 provided on the upper surface of the other stepped portion 33. 39 and 40 are temperature compensation capacitors, respectively.
The trimmer capacitors are disposed near the sides of the LSI package 31 in the lateral direction, the temperature compensation capacitor 39 is placed on the top surface of a predetermined terminal among the terminals 35 of the LSI package 31, and the trimmer capacitor 40 is placed on the other terminals 35. It is soldered to the lower surface of the specified terminal.

Therefore, when assembling from the disassembled state shown in FIG.
Electronic components such as 40 are soldered and fixed to predetermined terminals of the LSI package 31. And LSI package 3
1 into the fitting hole 23 of the lower housing 21, and the crystal resonator 37 and the silver oxide battery 36 into the lower housing 21.
are inserted into the storage holes 24 and 25, respectively. At this time, the bottom surface of the LSI package 31 in the lateral direction is locked by the stepped portions 41 formed on both sides of the fitting hole 23 in the lateral direction. LCD panel 2
The upper housing 20 and the lower housing 21 are assembled with each other in such a state that the external lead-out terminals 6 are placed in contact with the terminals 34 on both sides of the LSI package 31 via the interconnector 28.

At this time, the liquid crystal panel 26 is attached to the upper housing 20.
It is fitted into the fitting hole 22 of and supported by the panel holding plate 27.

In this way, there is no need to specifically provide a circuit board for attaching electronic components and making electrical connections, and the number of parts is small, making it suitable for workability and mass production. It also has excellent reliability because it is directly connected to the LSI package. Also, when assembling, LSI
The package 31 has a fitting hole 2 in the lower housing 21.
3, the interconnector 28 is
Since the position is restricted by the upper outer surface of the stepped portion 33 of the LSI package 31, the electronic wristwatch can be assembled easily and reliably as originally designed.

In the above embodiment, the LSI package 31 is approximately the same size as the liquid crystal panel 26, but the important thing is that it has appropriate strength to support and fix the electronic components, and its terminals 34 correspond to the terminals of the liquid crystal panel 26. Any shape may be used as long as the shape is located, and various changes may be made to other configurations without departing from the gist of the present invention.

Further, in the above embodiments, the case where the present invention is applied to an electronic wristwatch has been explained, but the present invention is not limited to this, and can be widely applied to, for example, a small electronic calculator, etc. without departing from the gist of the present invention. It is possible.

As described above, according to the small electronic device of the present invention, in the electronic device having an optical display panel for optically displaying, the terminal of the LSI package that supplies electrical signals to the optical display panel is connected to the side edge of the LSI package. Since the step part is formed to correspond to the terminals of the optical display panel and the interconnector is interposed between the terminals of the LSI package and the terminals of the optical display panel, the conventional circuit board is not required. This reduces the number of parts, and as described above, the terminals of the LSI package are formed on the side edge step of the LSI package, and the interconnector is positioned on the outer surface of the upper part of the step, making it easier to assemble. To position the interconnector, simply place the interconnector on the side edge step and press it from the side to bring the side surface of the interconnector into contact with the upper outer surface of the step. In addition, in this state, the interconnector is supported by the LSI package on two sides, the bottom and side surfaces, so it will not easily fall over during assembly. Therefore, it is possible to improve assembly workability and mass production, and as a result, as mentioned above, there is no need for a relatively expensive circuit board, and this type of small electronic device can be manufactured inexpensively and reliably. It has features such as:

[Brief explanation of the drawing]

Figures 1 and 2 are an exploded perspective view of the main parts of a conventional electronic wristwatch and an exploded perspective view of a part thereof seen from the bottom, respectively, and Figure 3 is an example of the case where the present invention is applied to an electronic wristwatch. FIG. 26...Liquid crystal panel, 27...Interconnector, 31...LSI package, 33...Stepped portion.

Claims (1)

[Claims] 1. An optical display panel from which connection terminals are led out on the bottom surface and an LSI package formed by leading out connection terminals corresponding to the connection terminals at the side edges are stacked and arranged, and an interconnector is inserted between both the connection terminals. In the optical display panel connection structure for electrically connecting the optical display panel and the LSI package, the interconnector is constituted by a rod-shaped interconnector with a square cross section, and the side edges of the LSI package are The LSI package is formed into an L-shaped cross section with its lower end protruding laterally, and the connection terminals of the LSI package are led out to the upper surface of the protruding portion of the side edge, and the outer surface of the upper portion of the side edge is used as a positioning reference for the rod-shaped interconnector. A connection structure for an optical display panel characterized by a flat surface.