JP2567144B2 - Fluorescent display - Google Patents

Description

The present invention relates to a fluorescent display device, and more particularly to a so-called chip-in-glass type fluorescent display device in which an integrated circuit chip for a drive circuit is built in a vacuum envelope.

[Conventional technology]

Conventionally, this type of chip-in-glass (hereinafter referred to as CIG)
As shown in FIG. 3, the flat fluorescent display device constitutes a vacuum envelope with an anode substrate 1, a spacer glass 3 and a cover glass 2 and a low melting point glass (not shown) for hermetically sealing the space between them. . On the anode substrate 1, an anode 6 coated with a phosphor layer formed in a predetermined display pattern is provided. Anode 6
A metal electrode (hereinafter, referred to as a grid electrode) 5 covering the anode 6 and maintaining a predetermined distance is provided on the above, and further, a predetermined distance is maintained thereon. A linear cathode 4 is fixed and stretched on a filament support structure 10.

During operation, the linear cathode 4 is electrically heated, and when the potential of the grid electrode 5 becomes positive with respect to the potential of the linear cathode 4, it emits thermoelectrons to serve as an electron source. The emitted thermoelectrons bombard the anode 6 having a positive potential with respect to the potential of the linear cathode 4 to cause the phosphor layer to densify and display a predetermined pattern as light emission. It is the driving Si integrated circuit chip 8 that selectively and positively controls the potentials of the plurality of anodes 6 with respect to the potential of the linear cathode 4. The connecting electrodes (commonly called pads) of the driving Si integrated circuit chip 8 and the conductor wiring 41 (indicated by a broken line in the figure) formed of a thin film or a thick film for electrically connecting the anode 6 and the external terminal 7 are It is connected by a thin metal wire 42.

That is, this type of fluorescent display device uses a driving Si by a power supply and a control signal supplied from the outside through the external terminal 7.
It is controlled via the integrated circuit 8. As the driving Si integrated circuit chip 8, the one having the structure shown in the block diagram of FIG. 4 is widely used.

Such a driving Si integrated circuit chip 8 is connected to a single-potential high-potential power source and is controlled by a clock signal, serial data input, and other control signals. Each of the plurality of output drivers is connected to a separate anode 6 via a thin metal wire 42 and a conductor wiring 41, and controls the potential of the cathode 6 according to a control signal.

In these driving Si integrated circuit chips 8, normally, the potential of each input signal must be between the ground potential and the power supply potential. If this condition is not satisfied, the driving Si integrated circuit chips 8 will be destroyed. . Further, the potential of the serial data output becomes equal to the ground potential or the power source potential.

These driving Si integrated circuit chips 8 are often used by connecting a plurality (cascade connection) as shown in FIG. 5, and are driven by a power supply of the same potential.
If the serial data output and the serial data input are connected and used between I and II as necessary, the above-mentioned limitation is not touched and no problem occurs.

[Problems to be Solved by the Invention]

In the conventional CIG type fluorescent display device described above, there is a multicolor display in which an anode made of a plurality of phosphor layers having different emission colors is mixed in the same display device.

In general, phosphor layers having different emission colors have different emission efficiencies, and therefore have different luminances when they are made to emit light at the same potential. In such a display device, unless the balance of the luminance of each emission color is adjusted, the visibility of a specific emission color remarkably deteriorates and the function of the display device often deteriorates.

In order to prevent the deterioration of this function, it is usually necessary to adjust the emission voltage applied to the anode composed of phosphor layers having different emission colors to maintain the luminance balance in an appropriate range. Therefore, in such a fluorescent display device, a plurality of anode emission potentials are required.

In such a CIG type fluorescent display device, at least a driving integrated circuit chip connected to a high potential power source different in the number of anode emission potentials is built in and driven.
In this case, as shown in FIG. 6, even if the clock signal and the other control signals 14a and 14b are commonly connected to the driving integrated circuit chips connected to different high potential power sources, a problem occurs. However, due to the characteristics of the potential of serial data output and the limitation of the potential of the input signal as described above, the above-mentioned cascade connection is not performed between the driving integrated circuit chips I and II connected to different high potential power supplies. In addition, serial data input was input from each of the external terminals.

Therefore, the serial data input terminals 13 and 23 are required for the number of different high-potential power supplies, and there is a drawback that the feature of the CIG type fluorescent display device that the number of external terminals can be reduced is not utilized.

In addition, the external serial data output circuit must output in parallel, and thus has a drawback that it becomes complicated.

It is an object of the present invention to provide an economical fluorescent display device having a small number of external terminals, a simple serial data output circuit.

[Means for solving the problem]

The present invention provides a vacuum envelope, a linear cathode that is an electron source arranged in the vacuum envelope, and an anode that is coated with a phosphor layer that emits light by the impact of electrons from the linear cathode.
A grid electrode for controlling the emission of the electrons; an integrated circuit chip forming a part of a control circuit for controlling the potential of the anode; an external terminal for supplying a power supply control signal to the integrated circuit chip; In a fluorescent display device including a terminal and a conductor wiring that electrically connects the integrated circuit chip, a plurality of the integrated circuit chips are arranged, each of which is connected to a power source having a different potential, and a low power source potential is applied. The output signal of the connected integrated circuit chip is the input signal of the integrated circuit chip connected to the high potential power supply.

〔Example〕

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

FIG. 1 is a connection diagram of a driving integrated circuit chip having a built-in CIG type fluorescent display device according to a first embodiment of the present invention.

In the first embodiment, as shown in FIG. 1, the CIG type fluorescent display device has two driving integrated circuit chips.

There is the following relationship between the power supply potential V _I of the integrated circuit chip _I and the power supply potential V _II of the integrated circuit chip II.

V _I <V _{II The} potential V _out generated at the serial data output terminal 15 of the integrated circuit chip I satisfies the relationship of 0 ≦ V _out ≦ V _I. Therefore, since the relation of 0 ≦ V _out <V _III is satisfied, the integrated circuit chip II is destroyed even if the output of the serial data output terminal 15 of the integrated circuit chip I is connected to the serial data input terminal 23 of the integrated circuit chip II. There is nothing to do.

Further, as a result, the number of wirings connected to the external terminals is reduced by one as compared with the example of FIG. 6 showing the conventional technique.

FIG. 2 is a connection diagram of a driving integrated circuit chip incorporating a CIG type fluorescent display device according to a second embodiment of the present invention.

The second embodiment has three driving integrated circuit chips as shown in FIG.

A relationship of the following equation between the power supply potential V _III of the power supply potential V _I of the integrated circuit chip I and the power supply potential V _II of the integrated circuit chip II IC chip V _III.

V _I <V _II <V _III The serial data output terminal 15 of the integrated circuit chip I is connected to the serial data input terminal 23 of the integrated circuit chip II, and the serial data output terminal 25 of the integrated circuit chip II is connected to the serial data of the integrated circuit chip IIIC. Each is connected to the data input terminal 33. As a result, the number of wires connected to the external terminals is reduced by two as compared with the example of FIG. 6 showing the conventional technique.

In the first embodiment shown in FIG. 1, V _I = 14V, V _II
The CIG fluorescent display operated at = 20V showed extremely stable operation and was not destroyed even during the life test.

In the second embodiment shown in FIG. 2, V _I = 12V,
Similar results were obtained with the CIG type fluorescent display device operated at V _II = 16V and V _IIII = 20V.

〔The invention's effect〕

As described above, the present invention realizes cascade connection by connecting the serial data output terminal of the integrated circuit chip connected to the low power supply potential to the serial data input terminal of the integrated circuit chip connected to the high power supply potential. Therefore, the CIG type fluorescent display device has the effect of requiring only one external terminal for serial data.

Further, as a result, the external serial data output circuit does not need to output in parallel, so that the circuit is simplified, the cost is relatively low, and there is an economical effect.

In addition, the number of conductor wirings connected to the external terminals on the anode substrate is relatively reduced, which facilitates manufacturing, and thus has an economical effect.

[Brief description of drawings]

FIG. 1 is a connection diagram of a driving integrated circuit chip incorporated in a CIG type fluorescent display device according to a first embodiment of the present invention, and FIG. 2 is a drive incorporated with a CIG type fluorescent display device according to a second embodiment of the present invention. FIG. 3 is a partially cutaway perspective view of an example of a conventional CIG type fluorescent display device, FIG. 4 is a block diagram of an example of a driving integrated circuit chip, and FIG. FIG. 6 is a connection diagram of one example of two driving integrated circuit chips, and FIG. 6 is a connection diagram of another example of two conventional driving integrated circuit chips. 1 ... Anode substrate, 2 ... Cover glass, 3 ... Spacer glass, 4 ... Linear cathode, 5 ... Grid electrode, 6
…… Anode, 7 …… External terminal, 8 …… Driving Si integrated circuit chip, 10 …… Filament support, 11,21,31 …… Ground potential terminal, 12,22,32 …… High potential power supply terminal, 13,23,33 …… Serial data input terminal, 14a, 14b, 24a, 24b, 34a, 34b ……
Control signal input terminal, 15,25,35 …… Serial data output terminal, 16a, 16b, 26a, 26b, 36a, 36b …… Driver output terminal, 4
1 ... Conductor wiring, 42 ... Fine metal wire.

Claims (1)

(57) [Claims] 1. A vacuum envelope, a linear cathode serving as an electron source arranged in the vacuum envelope, and an anode coated with a phosphor layer that emits light by the impact of electrons from the linear cathode. ,
A grid electrode for controlling the emission of the electrons; an integrated circuit chip forming a part of a control circuit for controlling the potential of the anode; an external terminal for supplying a power supply control signal to the integrated circuit chip; In a fluorescent display device including a terminal and a conductor wiring that electrically connects the integrated circuit chip, a plurality of the integrated circuit chips are arranged, each of which is connected to a power source having a different potential, and a low power source potential is applied. A fluorescent display device, wherein an output signal of an integrated circuit chip connected thereto is an input signal of an integrated circuit chip connected to a high potential power source.