JPH0727338B2 - Fluorescent light emitting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a method of projecting electrons to a phosphor in a vacuum envelope, and is used as a display device for displaying characters / figures, or as characters / figures. The present invention relates to a fluorescent light emitting device used as a light source for a printer or the like used for printing such as.

[Prior Art] FIG. 3 shows an example of a fluorescent light emitting device as an image display device conventionally used.

This image display device includes a control electrode group 1 for controlling acceleration of electrons emitted from a cathode electrode (not shown) to the phosphor side.
And an anode electrode group 2 coated with a fluorescent material are arranged in a matrix to form a triode structure, and each control electrode 1 is connected to an output terminal of the control electrode drive circuit 3 and each anode. The electrode 2 is connected to the output terminal of the anode electrode drive circuit 4 and its drive is controlled, and a timing control circuit 5 for outputting a signal for timing between these drive circuits 3 and 4 is provided. It is connected.

In this image display device, the timing control circuit 5
When the timing signal is supplied from each of the drive circuits 3 and 4, the control electrode drive circuit 3 is adjacent to each other by the timing signal.
The control electrodes 1 of the book are sequentially selected and driven. At the same time, when a display signal is externally supplied to the anode electrode drive circuit 4 to obtain a desired image display, the corresponding anode electrode 2 is selected and driven. Then, the electrons emitted from the cathode electrode are accelerated and controlled by the selected two control electrodes 1 and hit the phosphor on the anode electrode 2, and the selected dot emits light. The control electrodes 1 that are not selectively driven by the control electrode drive circuit 3 in the above-described display drive operation are held at the ground potential.

[Problems to be Solved by the Invention] However, in the above-described image display device, when there are N display dots in the operation direction, that is, the arrangement direction of the control electrodes 1, N + 1 control electrodes 1 are required. Since the control electrode 1 is connected to each output terminal of the control electrode drive circuit 3, the number of bids of the output of the control electrode drive circuit 3 also needs N + 1 bits. Therefore, as the number of display dots increases, the number of bits output from the control electrode drive circuit 3 must be increased correspondingly. Particularly, as the display scale increases, the number of control electrode drive circuits with a large number of bits increases. However, there is a problem in that the device is expensive because it uses.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a fluorescent light emitting device capable of driving a large number of electrodes with a small number of bits and achieving cost reduction.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a fluorescent light emitting device of the present invention has a plurality of strip-shaped anode electrodes coated with a phosphor and electrons emitted from the cathode electrode to the phosphor side. A plurality of linear control electrodes for acceleration control are respectively arranged in a matrix, and each of the strip-shaped anode electrodes is connected to the anode electrode drive circuit for selectively driving a desired strip-shaped anode electrode to be displayed; A pair of control electrode driving circuits that sequentially connect and drive two adjacent linear control electrodes by alternately connecting every other linear control electrode, and a control electrode driving circuit. One of them has a linear control electrode commonly connected to at least two output terminals, and when two adjacent linear control electrodes are selectively driven by the two sets of control electrode driving circuits, Book linear control electrode Is characterized in that adjacent linear control electrodes are connected so as not to be selected and driven.

[Operation] One of the control electrode drive circuits is connected to the output terminal every other linear control electrode, and sequentially drives the adjacent two linear control electrodes. 1 for the other control electrode drive circuit
At least two linear control electrodes of the remaining linear control electrodes, which are alternately distributed every other line, are connected to the output terminal, and other control electrodes are regularly arranged with each of the linear control electrodes as a starting point. The linear control electrodes that are connected and serve as the starting points are sequentially selected and driven. As a result, some linear control electrodes are selectively driven together, and the number of bits output from the control electrode drive circuit can be reduced. When two adjacent linear control electrodes are selectively driven by the two sets of control electrode drive circuits, the linear control electrodes adjacent to the two linear control electrodes are not selectively driven. When a desired strip-shaped anode electrode is selectively driven by the anode electrode drive circuit according to the display signal, the electrons emitted from the cathode electrode are accelerated and controlled by the selectively driven linear control electrode, so that the phosphor of the strip-shaped anode electrode becomes It fires and displays light.

[Embodiment] FIG. 1 is a view showing an embodiment of a fluorescent light emitting device as an image display device according to the present invention.

The image display device according to this embodiment accelerates and controls the anode electrode group 6 made of a strip-shaped electrode coated with a phosphor, a cathode electrode (not shown) that emits electrons, and the electrons emitted from the cathode electrode to the phosphor side. The control electrode group 7 composed of linear electrodes and the control electrode group 7 are hermetically held in a vacuum atmosphere in the envelope 8.

The anode electrode group 6 to which the fluorescent substance is adhered is regularly arranged on a substrate (not shown) in the envelope 8, and the control electrode group 7 is arranged above the anode electrode group 6. They are arranged at predetermined intervals so as to be orthogonal to each other. Each anode electrode 6 is connected to the output terminal of the anode electrode drive circuit 9 one by one. Further, each control electrode 7 has two sets of control electrode drive circuits every other one.
It is distributed and connected to 10, 11. More specifically,
The distributed control electrodes 7 are connected to the output terminals of one control electrode drive circuit 10 one by one, and the first two control electrodes 7 are connected to the output terminal of the other control electrode drive circuit 11.
Only (7a, 7b) are connected, and the rest of the control electrodes are connected in groups of some three every other starting from these two control electrodes. Here, only two sets of drive circuits of 32 control electrodes for 16 bits and 2 bits are required.
A total of 18 bids can drive 32 control electrodes. When it is desired to expand the number of electrodes that can be driven, if an electrode is connected to the side of the drive circuit that has a small number of bids, several electrodes can be connected together from this electrode as a starting point.

Therefore, when the control electrodes 7 are driven, several control electrodes can be collectively selected and driven, so that the drive circuit 11 (or 1
It is possible to reduce the number of bits of the output 0).

Further, the anode electrode drive circuit 9 and the control electrode drive circuit 1
0 and 11 are connected to the timing control circuit 12, and drive control of each electrode 6 and 7 is performed based on the timing signal supplied from the timing control circuit 12.

That is, the anode electrode drive circuit 9 is the timing control circuit 12
When a display signal is supplied from the outside together with the supply of the timing signal from, the anode electrode 6 selected by this display signal is driven to a high level.

When a timing signal is supplied from the timing control circuit 12 to the control electrode drive circuits 10 and 11 similarly to the anode electrode drive circuit 9, two control electrodes 7 and 7 that are adjacent to each other are sequentially driven without being scanned. . At this time, several control electrodes 7 are simultaneously
Is selectively driven, but a predetermined negative potential is supplied to the control electrode 7 which is not selectively driven by this control electrode drive circuit.
Electrons emitted from the cathode electrode are made to strike the fluorescent substance by the control electrode which is selectively driven without contributing to the display to cause the phosphor to emit light, and the electrons pass between the control electrodes 7 so as not to cause an erroneous display. Prevent. The negative voltage supplied at this time is set to an optimum value in consideration of leakage light emission, display vignetting, etc.For example, when the anode voltage is about 150 V, it is -25 to -30 V with respect to the cathode electrode. Is.

In this way, when the timing signal is supplied from the timing control circuit 12 to each drive circuit 9, 10, 11, two adjacent control electrodes 7, 7 are sequentially scanned and selectively driven, and this selective drive is performed. When a display signal is supplied from the anode electrode drive circuit 9 to the anode electrode 6 located immediately below the control electrodes 7 and 7, electrons are struck by the phosphors in the anode electrode 6 portion and light emission display is performed. It is like this.

Next, the operation of the image display device configured as described above is
The case where the lines in FIG. 1 are selectively driven will be described as an example.

The adjacent control electrodes 7-1 and 7-2 are selectively driven by driving the output terminals X ₁ and X ₁₇ of the control electrode drive circuits 10 and 11 to a high level by the timing signal from the timing control circuit 9. The line is selected. Then, when a display signal is supplied to the anode electrode 6 via the anode electrode drive circuit 9, electrons impinge on the phosphor on the anode electrode 6 to display light. At this time, at the same time, a high level signal is supplied to the control electrodes 7-5, 7-9, 7-13 connected to the same output terminal of the drive circuit 11, but the unselected control electrode 7 is connected. The output terminals of the control electrode drive circuits 10 and 11 are controlled to a predetermined negative voltage to prevent the phosphors near these electrodes from emitting light. Further, when the line is selected, the output terminals X ₁ and X ₁₈ of the drive circuits 10 and 11 are set to a high level to selectively drive the control electrode 7, and the other output terminals are held at a predetermined negative voltage. The display signal is supplied to the anode electrode 6 on the line. In the same manner, the control electrodes 7 are sequentially scanned and selectively driven to supply a display signal to a desired anode electrode 6.

By the way, in general, the maximum number N of control electrodes 7 that can be driven by a drive circuit having n-bit (X ₁ , X ₂ , ..., X _n ) output terminals is the same as the number of control electrodes 7 adjacent to each other. This is the maximum number when multiplex wiring is performed so that the combination does not occur more than once.

Therefore, as shown in FIGS. 2 (a) and 2 (b), consider a convex n-sided polygon having n vertices, X ₁ , ..., Xn, and connect each vertex with a straight line.

Next, consider writing a figure with a single stroke starting from an arbitrary vertex Xi. At this time, the number of vertices passing by one stroke is equivalent to the maximum number N of control electrodes 7 to be obtained.

1) When n is an odd number (state of FIG. 2 (a)) Since all vertices are even points, it is possible to write a figure with one stroke. At this time, since the total number of straight lines is nC ₂ , the number of passing vertices is nC ₂ +1. That is, N
= A ^{(n 2 -n + 2) /} 2.

2) When n is an even number (state of FIG. 2 (b)) Since all vertices are odd points, it is impossible to write the figure of FIG. 2 (a) with a single stroke. Therefore, as shown in FIG. 2B, every other side of the convex n-sided polygon has a total of n−2 /.
Two shall be deleted. As a result, the vertex has 2 odd points.
Since it is an individual point and all others are even points, it is possible to write a figure with one stroke. Therefore, the total number of straight lines is nC ₂ −
(N−2) / 2, so the number of passing vertices is nC ₂ −
(N-2) / 2 + 1. That is, N = (n ² −2n +
4) / 2.

This can also be obtained by the method described below.
Now, the maximum number n of control electrodes 7 is given, and the arrangement thereof is A ₁ , A ₂ , A ₃ , ..., A _N. The total number of drive circuits at this time is n bits.

Next, it is assumed that a 2-bit circuit is added, and these circuits are B and C, respectively.

1) When n is an odd number, a new sequence of B, C, X ₁ , B, X ₂ , C, X ₃ , ..., C, Xn (2n + 1) is created. Furthermore, A ₁ , A ₂ , A ₃ , ...,
A _N, make _{B, C, X 1, B} , X 2, C, X 3, ......, C, the sequence of Xn, A _N
Swap Xi corresponding to and the rightmost Xn.

A ₁ , A ₂ , A ₃ , ……, Xi, B, C, X ₁ , B, X ₂ , C, X ₃ , …… C, A _N This sequence is obviously the maximum number when (n + 2) Is giving.

_{Therefore, Nn + 2 = Nn + (} 2n + 1) = (n 2 -n + 2 + 4n + 2) / 2 = [(n + 2) 2 - (n + 2) +2] / 2 That ^{is, N = (n 2 -n +} 2) / 2 ( when n = 1 Is N =
1 is clear).

2) When n is an even number, a new sequence C, X ₁ , B, X ₂ , C, X ₃ , ..., B, Xn (2n) is created. Furthermore, A ₁ , A ₂ , A ₃ , ……, A _N , C, X
Make a sequence of ₁ , B, X ₂ , C, X ₃ , ..., B, Xn, and replace Xi corresponding to A _N with the rightmost Xn.

A ₁ , A ₂ , A ₃ , ……, Xi, C, X ₁ , B, X ₂ , C, X ₃ ,…, Xn,… B, Xi This sequence is obviously the maximum number when (n + 2) Is giving.

Thus _{Nn + 2 = Nn + 2n =} (n 2 -2n + 4 + 4n) / 2 = [(n + 2) 2 -2 (n + 2) +4] / 2 That ^{is, N = (n 2 -n +} 4) / 2 ( when the n = 2 N =
1 is clear).

Therefore, if the connection relationship between the control electrode 7 and the control electrode drive circuits 10 and 11 is variously set, (n ² −n + 2) / 2 (n is an odd number) control electrodes using a total of n bit control electrode drive circuits. Alternatively, it is possible to drive (n ² −2n + 4) / 2 (n is an even number) control electrodes.

An example of calculating the number of bits of the control electrode drive circuit and the number of control electrodes that can be driven is shown below. The number of drive circuits is n, and the number of drivable control electrodes is N.

Regarding the above table, an example of n = 4, N = 6 will be described. The first output terminal X ₁ of the control electrode drive circuit and the first control electrode are connected, and the second output terminal X ₂ and the second control terminal X ₂ are connected. The control electrode is connected, and the second output terminal and the sixth control electrode are connected.

By the way, in the present embodiment, a display device using a strip-shaped electrode coated with a phosphor as the anode electrode 6 and a linear electrode as the control electrode 7 is used, and the selected pair of control electrodes 7 and 7 has a high level. Although it is configured to be driven by applying the same voltage as above, it is also possible to apply a different voltage to the selected pair of control electrodes 7 and 7 to deflect the electron current and display a desired phosphor by light emission. Good.

Further, as the anode electrode 6, an electrode provided in a solid shape on the entire surface of the substrate is used, and a fluorescent substance is deposited on this, and one of two sets of linear electrodes intersecting in a matrix is scan-driven as described above. However, the other set may be driven according to the display signal. At this time, a voltage of about several tens V to 10 kV may be appropriately applied to the anode electrode.

Further, the above-mentioned display device can be applied to a system in which selection and deflection in the vertical direction and the horizontal direction are performed by electrodes, as in a display device in which a plurality of control electrodes are three-dimensionally arranged. In addition to the image display device, it can be used for various purposes such as a light source for a printer.

As described above, according to the fluorescent light emitting device of the present invention,
Unlike the conventional method, the number of bits at the output terminal of the control electrode drive circuit does not need to be the same as the number of control electrodes, and the control electrode is connected to the drive circuit side with a small number of bits used, and this control electrode is the starting point By connecting several together, it is possible to drive a large number of control electrodes with a control electrode drive circuit with a small number of bits, and it is possible to select and drive several of them that can be priced together. A large number of control electrodes can be driven by the circuit, and the cost can be reduced.

In addition, since a negative potential is applied to the electrodes that are not selectively driven,
It is possible to prevent erroneous display by suppressing acceleration of electrons in a portion of the control electrodes which are selectively driven by the drive circuit at the same time and which originally do not contribute to display.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a fluorescent light emitting device according to the present invention, and FIGS. 2 (a) and 2 (b) show the number of control electrodes which can be driven by a drive circuit having an output terminal of a predetermined bit number. FIG. 3 is a diagram for explaining and an example of a conventional image display device. 6 ... Anode electrode, 7 ... Control electrode, 8 ... Enclosure, 9 ...
… Anode electrode drive circuit, 10, 11 …… Control electrode drive circuit, 12
... Timing control circuit

Claims (1)

[Claims] 1. A plurality of strip-shaped anode electrodes coated with a phosphor, and a plurality of linear control electrodes for accelerating and controlling the electrons emitted from the cathode electrode toward the phosphor are arranged in a matrix. An anode electrode drive circuit connected to each of the strip-shaped anode electrodes to selectively drive a desired strip-shaped anode electrode to be displayed, and two adjacent linear control electrodes alternately connected to each other. And a pair of control electrode driving circuits for sequentially driving the linear control electrodes of 1), one of the control electrode driving circuits has at least two output terminals each having one linear control electrode. Is commonly connected to
When two adjacent linear control electrodes are selectively driven by the two sets of control electrode drive circuits, the linear control electrodes adjacent to the two linear control electrodes are connected so as not to be selectively driven. A fluorescent light emitting device characterized in that