JPS6023982Y2 - hybrid integrated circuit - Google Patents

Description

[Detailed explanation of the invention] This invention is based on hybrid integrated circuits (hybrid IC1 and below HIC).
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In general, in HIC, a wiring pattern and a thick film resistor are formed by screen printing on a base material such as ceramic, and a semiconductor chip, etc. is connected to the wiring pattern by wire bonding, and a ceramic lid is placed to keep the contents airtight. Alternatively, it has a structure in which it is covered with a filler such as epoxy and has pin leads drawn out from the input and output ends.

HICs are used in a wide variety of applications, especially in fields that require a large number of circuits and large current or high voltage outputs, such as core memory access circuits and discharge display board drive circuits. It is widely used.

As an example, let's take a look at its application to a discharge display board drive circuit.

The discharge display board consists of two glass plates each having an X electrode group and a Y electrode group formed thereon, arranged with a discharge space in between so that each electrode group faces each other at right angles, and neon lights are placed in the discharge space. It has a structure in which ionized gas such as
Each electrode of the Y electrode group is electrically solicited one by one, and when one electrode of the Y electrode group is solicited, each electrode of the X electrode group corresponding to the discharge cell on which the display on this electrode is to be lit is It is driven by a so-called line sequential scanning method in which a display is obtained by electrically stimulating the discharge cells to light up.

The voltage required for soliciting a discharge display board is generally 150 to 250
(2) Constructing a driver circuit using a monolithic integrated circuit at high voltage is currently technically difficult and uneconomical.

Therefore, a driver circuit must be assembled using single electric elements such as transistors and resistors. For example,
3 using the matrix method where one character is composed of 5 x 7 dots.
160 to obtain a display of wavy characters x 8 lines (25ff characters)
A total of 56 X electrode groups and 56 Y electrode groups are required, and constructing the entire driver circuit with a single electric element is not only completely uneconomical, but also requires a large volume of space, and This results in a poor display device.

Therefore, the adoption of HIC, which can be constructed from a transistor chip, a thick film resistor, etc., is a very effective means.

This is because if driver circuits for 5 to 6 electrodes of a discharge display board are incorporated into a single HIC package, the number of man-hours required for assembling the display device can be reduced to a fraction, and the circuit volume can be reduced to less than half.

Furthermore, when HIC is adopted, there is an advantage that not only the driver circuit section but also the logic circuit TTL chip can be incorporated into the same package.

Now, when the pitch of the pixels constituted by the discharge cells of the discharge display panel is about 0.5 to 17FEIF1, the most legible character size can be obtained.

The pitch of the terminal parts for drawing out the X electrodes and Y electrodes to the outside of the display board is twice the pixel pitch, or 1 to 2 m, because the X electrodes and Y electrodes can be drawn out to two opposing sides of the display board.
It becomes s.

By the way, if the output terminal pitch of the driver HIC matches the terminal pitch of the discharge display board, the output terminals of the HIC and the terminals of the discharge display board can be wired linearly.

That is, there is no need to provide a pitch conversion means using a connector or a printed wiring board, such as directly connecting the output terminal lead wire of the HIC to the terminal of the discharge display board, and it becomes possible to provide an inexpensive display device.

However, in order to take out the output terminal pitch of the HIC at a pitch of 1 to 2 times, the driver circuit for 1 electrodes of the discharge display panel must be within a width range of 1 to 2 TlrrIt.

In cases where one driver circuit is composed of several elements, it is not only physically very difficult to keep it within the above range, but also increases the number of man-hours and decreases the yield when producing fine patterns. Furthermore, many negative factors will occur, such as a decrease in reliability due to insufficient area for the thick film resistor.

The purpose of the present invention is that the pitch of the output terminals is, for example, 1 to 2rr.
The object of the present invention is to provide an HIC configuration that is extremely detailed, easy to manufacture, and highly reliable.

According to the present invention, in a hybrid integrated circuit having a plurality of input terminals and a plurality of output terminals, the substrate on which at least one set of input terminals and output terminals are formed is spaced apart with the lead-out surfaces of each terminal parallel to each other. A hybrid integrated circuit is obtained, which is constructed by stacking a plurality of boards in such a way that the output terminals of each board are alternately drawn out in the same direction one by one so that they do not overlap when viewed from the stacking direction. .

Figures 1a and 1b show a first embodiment of the present invention, with Figure 1a being a front view and Figure 1A being a side view.

In the first embodiment, the driver circuit section is divided into two parts, formed on a first ceramic substrate 1 and a second ceramic substrate, respectively, and covered with ceramic acids M3 and 4, respectively. The ceramic substrates are bonded back to back using an epoxy adhesive or the like.

The terminal pitch of the output terminals 5 from the first ceramic substrate and the output terminals 6 from the second ceramic substrate is 2, respectively.
．． 54 mm, and by forming the first ceramic substrate and the second ceramic substrate with a shift of 1.27TIII, the output terminal pitch after bonding is 1.272.
FE+71, which is equivalent to the terminal pitch of the discharge display board and allows a means of directly connecting the output terminal leads of the HIC to the terminals of the discharge display board.

Also, the driver circuit section is 2.547FIl! It only needs to be assembled within the + width range, and double the space of the conventional 1.27mm can be used, allowing for extra space in the wiring pattern, and greatly improving both cost and reliability.

Note that 7 and 8 in FIG. 1 are input terminals of the first ceramic substrate and input terminals of the second ceramic substrate, respectively.

Figures 2a and 2b show a second embodiment of the present invention, with Figure 2a showing a field view and Figure 2a showing a side view after assembly.

In the second embodiment, the circuit-forming surfaces of two substrates are assembled so as to face each other with a ceramic acid frame 9 between them.

[Brief explanation of the drawing]

Part 1 a and b are a front view and a side view showing the first embodiment of the present invention. Figure 2 a,! :b is an exploded perspective view and a side view showing a second embodiment of the present invention. 1... First board, 2... Second board, 3, 4... Lid, 5, 6... Output terminal, 7, 8 ...Input terminal, 9...Frame.

Claims (1)

[Scope of utility model registration request] In a hybrid integrated circuit having a plurality of input terminals and a plurality of output terminals, a plurality of substrates (on which at least one set of input terminals and output terminals are formed) are arranged so that the lead-out surfaces of each terminal are parallel and spaced apart. 1. A hybrid integrated circuit characterized in that the circuit boards are stacked one on top of the other, and each output terminal of each board is alternately drawn out in the same direction so that they do not overlap when viewed from the stacking direction.