JP2900432B2 - Fluorescent display device and driving method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fluorescent display device in which an anode has a double matrix structure and a driving method thereof.

[Conventional technology]

FIG. 4 shows the structure of the anode and the grid portion of a conventional fluorescent display device in which the anode has a double matrix structure. Each row of the anodes, which are the light emitting segment group, is connected to the odd-numbered column anodes 1 and the even-numbered column anodes 2 to form a double matrix. A grid 3 of control electrodes is arranged at a middle position between the rows of the odd-row anodes and the even-row anodes with a gap from the anodes by spacers.

As a driving method of this fluorescent display device, adjacent grids (1G and 2G, 2G and 3G
) Are sequentially scanned so that a voltage is applied simultaneously for a predetermined time. Simultaneously, when a positive potential is applied to the selected anode among the odd-numbered column anodes sandwiched between the grids to which a voltage is applied, thermions emitted from the filament are accelerated by the grid and collide with the anode to which the positive potential is applied. The phosphor applied on the anode is excited to emit light. In the next time, when a positive potential is applied to the selected anode among the even-row anodes, thermions emitted from the filament are accelerated by the grid and collide with the positive potential applied anode to excite the phosphor applied on the anode. To emit light. In this manner, the odd-row anodes and the even-row anodes are alternately selected in synchronization with the sequential scanning of the grid, and the phosphors emit light to obtain a desired display.

[Problems to be solved by the invention]

In the above-described conventional fluorescent display device and driving method, since the grid driving circuit requires the number of anode rows + 1,
There is a disadvantage that the number of drive circuits is not reduced and the mounting area and cost of the drive circuits are increased.

An object of the present invention is to eliminate the disadvantages of the conventional fluorescent display device and the driving method, and to provide a display device and a driving method with a small mounting area and low cost.

[Means for solving the problem]

The present invention provides a fluorescent display device in which a display unit anode composed of a plurality of fluorescent segment groups emits light by bombardment with thermoelectrons, wherein the display unit anode forms a double matrix structure in which odd rows and even columns are connected in each row. And a grid of control electrodes orthogonal to this is arranged so as to sandwich the anodes of the odd-numbered rows and the even-numbered rows, and further has a grid commonly connected therebetween.

Further, according to the present invention, a constant positive potential is always applied to the grids connected in common, a positive potential is applied to the other grids for a certain period of time, scanned sequentially, and a positive potential is applied to the selected anode of the display unit anode facing the grid. Is applied to perform light emission display, thereby obtaining a driving method of the fluorescent display device.

〔Example〕

Next, the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. In each row, odd-numbered column anodes 1 are connected by wiring, and even-numbered column anodes 2 of each row are also connected by wiring to form a double matrix of anodes. The control electrode grid 3
The two rows of the odd-numbered row anode 1 and the even-numbered row anode 2 are sandwiched between them, and are arranged with a gap from the anode by spacers. or,
The grid 4 to which a constant positive potential is always applied is arranged between them.

Next, an operation method of the fluorescent display device of the present invention will be described. In the operation method, a constant positive potential is always applied to the grid 4 at the timing shown in FIG. 2, and a positive potential having a fixed time width is applied to the grid 3 and the grid 3 is sequentially scanned. An anode for emitting light is selected in synchronization with the grid waveform, and a positive potential is applied. First, at the second timing a, the thermoelectrons emitted from the filament are accelerated by the grid 1G and the grid 4 to which the positive potential is constantly applied. Then, it collides with the selected anode of the odd-numbered row anode sandwiched between the grids 1G and 4 to excite the phosphor on the anode to emit light. At the next timing b, since a positive potential is applied to the grid 4 and the grid 2G, thermionic electrons are accelerated during this time and collide with the selected anode of the even-numbered row anode sandwiched between the grid 4 and the grid 2G, and the fluorescent light is emitted as described above. Make the body emit light. In this way, the odd-row anodes and the even-row anodes are alternately selected in synchronization with the sequential scanning of the grid, and the phosphors are allowed to emit light to obtain a desired display.

As described above, in this embodiment, since a constant potential is always applied to the grids 4 connected in common, the driving circuit can be reduced to half the size of the conventional circuit and the mounting area can be reduced.

FIG. 3 is a cross sectional view of a second embodiment of the present invention. Each row of the anodes, which are the light emitting segment groups, is connected to the odd-numbered columns and the even-numbered columns by wiring on the glass substrate 5 by the conductor 6, and the phosphor is coated on the anodes by electrodeposition or thick film printing. Further, an insulating layer 7 is provided on the conductor 6, and between the odd and even rows of the anode, the insulating layer 7 is 0.4 to 0.4 mm above the anode.
It is formed 0.5 mm higher, and the electrode 9 is provided on this insulating layer. By connecting every other electrode among the electrodes 9 in common, the same function as the grid 4 of the first embodiment is performed. The remaining electrodes 9 have the same function as the grid 3.

In this embodiment, all the electrodes 9 are provided on the insulating layer. However, it is needless to say that the same effect can be obtained even if only the commonly connected electrodes are provided as in the present embodiment, and the rest is made to the grid of the first embodiment. Nor.

〔The invention's effect〕

As described above, according to the present invention, the thermoelectrons can be controlled to the odd column anode and the even column anode by sequentially scanning one grid by constantly applying a constant positive potential to the commonly connected grids. As a result, the driving circuit for sequentially scanning the grid voltage is halved as compared with the conventional fluorescent display device, so that the mounting area can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an anode and a grid according to a first embodiment of the present invention, FIG. 2 is a timing chart of voltage waveforms applied to the anode and the grid of FIG. 1, and FIG. FIG. 4 is a cross-sectional view of a conventional anode and grid, FIG.
The figure is a timing chart of voltage waveforms applied to the anode and the grid in FIG. 1... Odd-row anode, 2... Even-row anode, 3... Grid, 4... Commonly connected grid, 5.
6 ... conductor, 7 ... insulating layer, 8 ... phosphor, 9 ... electrode.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01J 31/15 G09G 3/30

Claims (2)

(57) [Claims] 1. A fluorescent display device which emits light by bombarding a display unit anode comprising a plurality of fluorescent segment groups with thermal electrons, wherein the display unit anodes are connected by wiring odd-numbered column anodes in each row,
Similarly, the even-numbered column anodes of each row are connected to each other by wiring to form a double matrix structure of the anodes. The grid for controlling the thermoelectrons to the display unit anodes is formed by the odd-numbered column anodes and the even-numbered column anodes.
A fluorescent display device comprising: a plurality of anode rows; and a grid commonly connected between the odd-numbered row anodes and the even-numbered row anodes. 2. A fluorescent display device which emits light by bombarding a display unit anode comprising a plurality of fluorescent segment groups with thermoelectrons, wherein the display unit anodes are connected by wiring odd-numbered column anodes in each row,
Similarly, the even-numbered column anodes of each row are connected to each other by wiring to form a double matrix structure of the anodes. The grid for controlling the thermoelectrons to the display unit anodes is formed by the odd-numbered column anodes and the even-numbered column anodes.
In a method of driving a fluorescent display device in which a row of anode rows is arranged and a grid commonly connected between an odd-row anode and an even-row anode, a constant positive potential is always applied to the commonly-connected grid. A driving method of a fluorescent display device, wherein a positive potential is applied to another grid for a certain period of time, and scanning is performed sequentially, and a positive potential is applied to a selected anode of the display unit anode to perform light emission display.