JP2517699Y2 - Fluorescent display tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a fluorescent display tube, and in particular, a display unit and a drive circuit unit including a semiconductor element are integrally formed on the same glass substrate, and the display unit and the drive unit are driven. Commonly known as "chip in glass" (chip in which the circuit part is provided in the same vacuum container (enclosure))
in glass) "(hereinafter referred to as CIG) structure.

[Conventional technology]

As a conventional fluorescent display tube having a CIG structure, there is provided a fluorescent display tube having a structure as shown in a partially cutaway perspective view of FIG. In these figures, a plurality of wirings 2, insulating coatings 3, laminated and deposited on the glass substrate 1,
An anode substrate 6 provided with a segment electrode 4 serving as a display portion and an IC chip 11 and a pad portion 5 serving as a display drive circuit portion.
On this anode substrate 6, an external lead 7 as an input terminal of the pad portion 5, a grid 8 integrated with the external lead 7 and a filament cathode 9 are arranged at an appropriate distance. And the so-called frame electrode group, and the entire substrate is sealed with a low melting point glass in a transparent vacuum airtight container (cover glass) 10 and the terminals of the external lead 7 are energized, and the pad 5 And the fluorescent display unit 4 is driven to emit light through the IC chip 11 electrically connected by the wire bonding method.

In the CIG structure fluorescent display tube with such a configuration, the IC
The output side circuit of the IC chip 11 protected by the shield cover 12 is connected to the display segment electrode 4, and the input side circuit of the IC chip 11 is led out of the vacuum as an external lead 7. As the grit electrode, one external lead 8 is led out, and this conventional example has a so-called statically driven CIG fluorescent display tube.

[Problems to be solved by the invention]

As an example of the conventional static drive CIG fluorescent display tube described above, NEC's fluorescent display tube driver IC [MPD6323A
FIG. 6 is a block diagram showing the drive circuit section when C] is used. In this figure, this IC [[MPD6323AC] has a 21-bit (pit) shift register, 21-bit latch, and driver function inside the vacuum envelope 20 and uses V _DD pin 30, V _SS as external control pins. Each power supply terminal of terminal 31 and BI
(Blanking) terminal 32, ▲ ▼ (Latch) terminal 33, DI
(Serial data input) terminal 34, ▲ ▼ (clock) terminal 35, open DO (serial data output)
It has a total of 7 terminals, each of which is a signal terminal. Except for the DO terminal 36, the terminals are provided outside the vacuum envelope 20. When this IC chip is used as a CIG fluorescent display tube, in the conventional structure, the external lead lead 7 (5th
In the figure, six power sources and signal terminals 30 to 35 except the DO (serial data output) terminal 36 are led out of the vacuum. That is, the DO terminal 36 is used as a cascade connection between chips only when a plurality of chips are mounted in the display tube, and in this case also, the DO terminal 36 of the final chip is open, and the external lead It was never derived as 7.

However, CI does not lead out the DO (serial data output) terminal 36 as the external lead 7 as described above.
When making a G fluorescent display tube, a problem often occurred that the CIG function could not be checked. In particular, it is impossible to compare the data transferred from the outside with the data output through the chip. Especially when multiple chips are mounted and each chip is cascade-connected, or even in the CIG structure when the clock frequency is high, evaluation of timing deviation (affected by L and C of wiring) and logic error (logic Reverse)
The evaluation can be performed only in the display state of the segment electrode 4. In particular, there is a problem that the analysis means cannot be taken when the display state is not normal.

An object of the present invention is to provide a fluorescent display tube in which the above-mentioned problems are solved and timing deviations and logic errors can be evaluated immediately.

[Means for solving problems]

According to the configuration of the present invention, the display unit having the phosphor layer and the circuit unit including the IC element for driving the display unit are integrally formed on the same substrate, and the display unit and the circuit unit are in the same vacuum. In the fluorescent display tube provided in the envelope, the serial data output electrode terminal of the IC element is led out of the vacuum envelope as an external lead and the electrode terminal is partially half-etched. It is characterized in that a lead-cut function is added so that the IC element can be cut after the function check has been performed.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a CIG drive circuit unit of a fluorescent display tube according to a first embodiment of the present invention. The block diagram shown in the figure shows the case where the IC chip is mounted on one chip, but the circuit function is the same as that of the conventional [MPD6323AC] shown in FIG. Inside the vacuum envelope 20, a 21-bit shift register (bit Shift Register) 37, 21-bit latch (bit Lat)
ch) 38, a NAND circuit 39 or the like, outside the vacuum, V _DD 3
It has 0, V _SS terminal 31, blanking terminal 32, latch terminal 33, serial data input terminal 34, clock terminal 35, and serial data output terminal 36. That is, it is shown that the DO (serial data output) terminal 36 is used as one external lead and led out from the vacuum envelope 20 to the outside of the vacuum.

FIG. 2 is a block diagram of a CIG drive circuit unit of a fluorescent display tube according to a second embodiment of the present invention. The block diagram shown in the figure shows the case where the IC chip is mounted in the two-chip vacuum 20 of the A chip 40 and the B chip 41. The DO terminal 36 'of the A chip 40 is the DI (serial) of the B chip 41. Data input) Terminal 3
4'is cascaded. In addition, the DO terminal 36 'of the A chip 40 and the DO terminal 36 of the B chip 41 are led out to the outside of the vacuum as external leads.

According to the configuration shown in FIG. 2, the timing waveform at the time of data transfer, etc. after passing through the A chip 40 or B
It is possible to check in any state after passing the chip 41, and it has become possible to obtain very effective data for CIG functional analysis.

In this embodiment, when the IC chips are cascade-connected, the DO terminal of the final-stage IC chip is used as an external lead.

The DO terminals of each IC chip are connected in parallel to external leads.

DOs drawn out when used as CIG fluorescent display products
The terminals can also be cut after checking the function of the IC chip (commonly called lead cut).

FIG. 3 is a plan view showing a notched part of a fluorescent display tube having a CIG structure according to a third embodiment of the present invention. In the figure, in the fluorescent display tube of the present embodiment, the same reference numerals are used for the same members as in the conventional example of FIG. In the figure,
The fluorescent display tube of the present embodiment is for a drive circuit on the glass substrate 1.
One IC chip 11 is die-bonded, and each pad portion 5 is wire-bonded. This embodiment has the same configuration as that of the CIG block diagram shown in FIG.
From the pad portion 50 electrically connected to the DO (serial data output) electrode of the C chip 11, it is led out of the vacuum through the thin film wiring 2 by the external lead 70 of the DO.
Further, the external lead-out lead 70 is formed with a half-etched portion 75 which is different from the other external lead-out leads 7, and the lead can be easily removed from the etched portion 75 by bending (also referred to as lead cut). It has a structure.

That is, in this embodiment, after checking the chip function,
By removing the unnecessary external lead 70, the external lead is reduced as a CIG fluorescent display tube.

[Effect of device]

As described above, according to the present invention, at least one serial data output terminal (referred to as DO) of the mounted IC chip is
Quantitative data related to CIG basic functions such as the presence or absence of timing deviation of the data that comes out inside the chip when it is led out of the vacuum as this external extraction lead and the data is transferred using this lead. It is possible to confirm the above, and there is an effect that an effective means can be obtained in reliability evaluation.

Further, the present invention is a CIG product, and in particular, if the external lead leads are to be reduced, the above-mentioned DO
There is also an effect that the leads can be half-etched to have a function as a lead cut.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a fluorescent display tube according to a first embodiment of the present invention, FIG. 2 is a circuit block diagram of a fluorescent display tube according to a second embodiment of the present invention, and FIG. 3 is a plan view of the fluorescent display tube of the third embodiment, FIG. 4 is a perspective view in which a part of the conventional fluorescent display tube having a CIG structure is cut away, and FIG. 5 is a partial cutaway view of FIG. The plan view shown in FIG. 6 is a circuit block diagram for explaining the function of the conventional CIG circuit. 1 ... glass substrate, 2 ... wiring, 3 ... insulating film, 4 ...
… Segment anode, 5 …… Second side pad, 6 ……
Anode substrate, 7 ... External lead, 8 ... Grid, 9 ... Filament cathode, 10 ... Cover glass, 11
...... IC chip, 12 ...... IC shield cover, 20 …… vacuum envelope, 50 …… Serand side DO (serial data output) pad, 70 …… DO external drawer lead, 75 …… Half-etched part.

Claims (1)

(57) [Scope of utility model registration request] 1. A display section having a phosphor layer and a circuit section including an IC element for driving the display section are integrally formed on the same substrate, and the display section and the circuit section are outside the same vacuum. In the fluorescent display tube provided in the envelope, the serial data output electrode terminal of the IC element is led out of the vacuum envelope as an external lead, and the electrode terminal is partially half-etched. The fluorescent display tube is characterized in that a lead cut function is added to cut the IC element after checking its function.