JPH075243U - Graphic fluorescent display tube - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a graphic fluorescent display tube having a small number of bits of a driving IC and good display quality. Structure: First control electrodes Ga1, Ga2 ... Composed of a plurality of wire-shaped electrodes electrically commonly connected so that the control electrodes can always be kept at a constant potential, and one or a plurality of first control electrodes Ga1, Ga2, ... A wire-shaped electrode of
Second control electrodes Gb1 and Gb2 to which a drive signal having a higher potential and a lower potential than the potential applied to the control electrode is applied
Have ...

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a graphic fluorescent display tube for displaying characters, numbers, figures, etc., and more particularly to driving control electrodes.

[0002]

[Prior art]

 In a conventional graphic fluorescent display tube, a control electrode composed of a wire-shaped electrode and a striped anode conductor having a phosphor layer formed on one surface or in a dot shape on the upper surface are arranged in a matrix, and two control electrodes are provided. The electrodes are simultaneously driven in a time-division manner, and a display signal is selectively applied to the anode conductor so that the intersection between the region sandwiched by the two control electrodes and the anode conductor is luminescently displayed. In this type of graphic fluorescent display tube, it is easy to apply tension to the control electrode, and it has an effect that it can be applied to large-sized ones. Moreover, since the control electrode is in the form of a wire, high-definition display is possible.

However, in the above-described graphic fluorescent display tube, when the pixel pitch, which is a light emitting unit for display, becomes coarse, the interval between the control electrodes becomes wider, and the cutoff voltage of the control electrode for blocking the electrons emitted from the cathode rises. In the worst case, electrons could not be blocked by the control electrode, causing leakage light emission. In order to solve the above-mentioned problems, for example, as disclosed in Japanese Utility Model Laid-Open No. 60-60796, there is a structure in which an auxiliary control electrode is provided between two control electrodes. The auxiliary control electrodes are driven in accordance with the driving of the two control electrodes.

[0004]

[Problems to be solved by the device]

 By the way, in the graphic fluorescent display tube described in Japanese Utility Model Laid-Open No. 60-60796, a driving voltage is applied to the auxiliary control electrode as well, so that a driving IC for controlling the auxiliary control electrode is required. Further, since the same potential is applied to the auxiliary control electrode and the control electrode, there is no action of focusing electrons. When the pixel pitch becomes large, electrons are concentrated from a wide range, so that the directionality of the electrons varies, and there is a problem in that light leaks from both sides of the pixel to be selectively displayed.

[0005]

[Means for Solving the Problems]

 The present invention has been made in view of the above problems, and an object of the present invention is to provide a graphic fluorescent display tube having a small number of bits of a driving IC and a good display quality. To achieve the above object, the structure of the present invention is such that a wire-shaped control electrode and an anode conductor having a phosphor layer on the surface are arranged in a matrix, and electrons emitted from the cathode are connected to the control electrode. In a graphic fluorescent display tube which selectively controls with the anode conductor and causes the fluorescent material layer to project and to perform a desired light emission display, the control electrodes are electrically commonly connected so as to be held at a constant potential, And a first control electrode composed of a plurality of wire-shaped electrodes extending substantially parallel to each other, and a first control electrode composed of one or a plurality of wire-shaped electrodes extending substantially parallel to the first control electrode. A second control electrode to which a drive signal having a higher potential and a lower potential than the potential applied to the electrode is applied, and a pixel for display is formed between the electrodes of the first control electrode, and 2 control electrodes Is disposed configuration so as to be positioned on top of the unit.

[0006]

[Action]

 With the above-described configuration, desired display can be performed by applying a constant potential to the first control electrode and applying a drive signal to the second control electrode. The pixel selection is performed by the second control electrode and the anode conductor.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a view showing an embodiment of the present invention, and is a view showing a positional relationship between a cathode emitting electrons, a control electrode, and an anode conductor having a phosphor layer deposited on the surface thereof. Although not shown, the anode conductors A1 to Am are arranged in stripes on the inner surface of the glass substrate forming a part of the airtight envelope, and a phosphor layer that emits a desired emission color is attached to the surface. Has been done. The wire-shaped first control electrodes Ga1 to Gan made of thin metal wires are provided on the face plate side of the airtight envelope facing the glass substrate at a predetermined height so as to be orthogonal to the anode conductors A1 to Am. And the second control electrodes Gb2 to Gbn -1 are alternately arranged. Further, a plurality of linear cathodes F1 to Fx are stretched on the side of the facing face plate.

Then, a predetermined voltage is applied to the linear cathodes F1 to Fx by the power source Ef. Further, the switches S11 to S1m of the anode conductors A1 to Am are switched according to the drive signal, and a predetermined anode voltage is applied by the anode power source Eb. Further, it is configured such that a constant voltage is constantly applied to all the first control electrodes Ga1 to Gan by the power source Eg1. The second control electrodes Gb1 to Gbn-1 are connected to the power supply Eg2 via the switches S1 to Sn, respectively, and are normally connected to the power supply Ek via the resistors R1 to Rn. A cutoff voltage is constantly applied to the second control electrodes Gb1 to Gbn-1 by the power source Ek to block the progress of electrons. When a drive signal is applied, the switches S11 to S1m are used for switching, and the power supply Eg2 applies a drive voltage.

The voltage applied to the first control electrodes Ga1 to Gan is higher than the cut-off voltage applied to the second control electrodes Gb1 to Gbn-1, and is applied to the second control electrodes Gb1 to Gbn-1. The drive voltage is lower than the drive voltage. The voltages applied to the first control electrodes Ga1 to Gan and the second control electrodes Gb1 to Gbn-1 are determined by the voltages applied to the anode conductors A1 to Am, the positional relationship between the electrodes, the pixel pitch, and the like. The electrons emitted from the linear electrodes F1 to Fx by the second control electrodes Gb1 to Gbn-1 are set to controllable conditions. Then, as shown in the timing chart of FIG. 2, a constant voltage is applied to the first control electrodes Ga1 to Gan and the voltage applied to the second control electrodes Gb1 to Gbn is driven in a time division manner from the cutoff voltage. By applying a driving voltage to the anode conductors A1 and A2 while applying a voltage, the pixels P1 and P2 can emit light.

Because of the above-described structure, in the conventional graphic fluorescent display tube, the drive signal had to be applied to the opposite sides of the control electrode and the auxiliary control electrode, whereas the graphic fluorescent display tube shown in the example. In the display tube, if a driving voltage is applied to the second control electrodes Gb1 to Gbn-1, the pixel column in one direction can be selected, and the number of bits of the driving IC can be greatly reduced. In addition, since the driving voltage applied to the second control electrodes Gb1 to Gbn-1 is higher than the voltage applied to the first control electrodes Ga1 to Gan, an electrostatic lens is formed corresponding to the selected pixel column. Electrons are focused by the electrostatic lens, so that the display quality can be improved while suppressing the leakage light emission, and the emission brightness can be increased.

[0011]

[Other Examples]

 FIG. 3 shows another embodiment of the graphic fluorescent display tube of the present invention. It is basically the same as the graphic fluorescent display tube shown in FIG. 1, and has a structure in which two second control electrodes are provided for one pixel column. The second control electrodes Gb1 to Gb2n −2 are configured such that a cutoff voltage or a drive voltage is simultaneously applied as a set of two. The number of electrodes of the second control electrodes Gb1 to Gb2n-2 is doubled, but the number of bits of the driving IC is equal to that in the previous embodiment. Also, when the pixel pitch is large or when the display is observed from the direction of the linear cathodes F1 to Fx, the second control electrodes Gb1 to Gb 2n-2 can be provided at a position outside the central portion of the pixel. The display quality can be improved.

[0012]

【effect】

 As described above, in the graphic fluorescent display of the present invention, the wire-shaped control electrode and the anode conductor on which the phosphor layer is arranged are arranged in a matrix, and electrons emitted from the cathode are transferred to the control electrode. In the graphic fluorescent display tube that selectively controls the phosphor layer and the anode conductor to cause the phosphor layer to project, and the desired light emission display, the control electrodes are electrically commonly connected so that they can be held at a constant potential. A first control electrode formed of a plurality of wire-shaped electrodes extended substantially parallel to each other and one or a plurality of wire-shaped electrodes extended substantially parallel to the first control electrode, It is composed of a second control electrode to which a drive signal having a higher potential and a lower potential than the potential applied to the control electrode is applied, and a pixel for display is formed between each electrode of the first control electrode, and The second control electrode is It is characterized in that arranged so as to be positioned on top of the unit.

Therefore, since the pixel column in one direction can be selected by controlling the second control electrode, in the conventional graphic fluorescent display tube, a driving signal must be applied to the opposite sides of the control electrode and the auxiliary control electrode. On the other hand, the number of driving IC bits can be greatly reduced. In addition, since the driving voltage applied to the second control electrode is higher than the voltage applied to the first control electrode, an electrostatic lens is formed corresponding to the selected pixel row, and the electron effect is focused by the lens effect. As a result, leakage light emission can be suppressed, display quality can be improved, and light emission brightness can be increased.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of a graphic fluorescent display tube of the present invention.

FIG. 2 is a timing chart showing a driving state of the graphic fluorescent display tube shown in the first embodiment.

FIG. 3 is a view showing a second embodiment of the graphic fluorescent display tube of the present invention.

[Explanation of symbols]

 A1, A2 Anode conductor Ga1, Ga2 First control electrode Gb1, Gb2 Second control electrode P1, P2 Pixel F1, F2 Cathode

Claims (1)

[Scope of utility model registration request] 1. A wire-shaped control electrode and an anode conductor having a phosphor layer on the surface are arranged in a matrix, and electrons emitted from the cathode are selectively controlled by the control electrode and the anode conductor. In a graphic fluorescent display tube that emits a desired light emission display by being projected onto the phosphor layer, the control electrodes are electrically connected in common so as to be maintained at a constant potential, and are stretched substantially parallel to each other. A first control electrode composed of a plurality of wire-shaped electrodes and one or a plurality of wire-shaped electrodes extending substantially parallel to the first control electrode,
It is composed of a second control electrode to which a drive signal having a higher potential and a lower potential than the potential applied to the first control electrode is applied, and a display pixel is formed between the respective electrodes of the first control electrode. In addition, the second control electrode is disposed so as to be located above the pixel.